US20090126936A1 - Actuating mechanism - Google Patents
Actuating mechanism Download PDFInfo
- Publication number
- US20090126936A1 US20090126936A1 US11/666,674 US66667404A US2009126936A1 US 20090126936 A1 US20090126936 A1 US 20090126936A1 US 66667404 A US66667404 A US 66667404A US 2009126936 A1 US2009126936 A1 US 2009126936A1
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- United States
- Prior art keywords
- actuating mechanism
- mechanism according
- sleeve
- flushing device
- condition
- Prior art date
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- 230000007246 mechanism Effects 0.000 title claims abstract description 216
- 239000012530 fluid Substances 0.000 claims abstract description 42
- 230000008859 change Effects 0.000 claims abstract description 12
- 238000011010 flushing procedure Methods 0.000 claims description 154
- 238000005520 cutting process Methods 0.000 claims description 27
- 239000002002 slurry Substances 0.000 claims description 24
- 238000005553 drilling Methods 0.000 claims description 19
- 230000014759 maintenance of location Effects 0.000 claims description 19
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/004—Indexing systems for guiding relative movement between telescoping parts of downhole tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
- E21B21/103—Down-hole by-pass valve arrangements, i.e. between the inside of the drill string and the annulus
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/004—Indexing systems for guiding relative movement between telescoping parts of downhole tools
- E21B23/006—"J-slot" systems, i.e. lug and slot indexing mechanisms
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/04—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion
- E21B23/042—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion using a single piston or multiple mechanically interconnected pistons
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/12—Valve arrangements for boreholes or wells in wells operated by movement of casings or tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
- E21B34/142—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0007—Equipment or details not covered by groups E21B15/00 - E21B40/00 for underwater installations
Definitions
- the present invention generally relates to an actuating mechanism for use in an apparatus to effect movement of the apparatus between two or more modes of operation.
- the actuating mechanism can be used in a flushing device incorporated in a drilling stem used in mining to open and shut the device.
- the current invention can be applied in many different types of tools and devices. For instance it may be incorporated in under reamers, casing cutters, ball valves and other type of valves, packers and tools for deep mineral air drilling.
- the invention would also be useful in flushing devices used in drilling strings in oil and gas explorations and extraction.
- One of these challenges is in respect of maintaining suitable conditions for the operation of the drill head or bit to cut through the medium.
- slurry used to operate the drill head
- This slurry upon reaching the end of the bore is caused to return to the surface, passing through the annular space between the sidewalls of the bore and the drill stem assembly before reaching the surface, whereby the returning slurry suspends the cuttings, made during the drilling process, transporting them back to the surface.
- the removal of the cuttings ensures the bore remains relatively clean, providing optimal conditions for drilling. Failure to remove the cuttings, or a suitable percent of the cuttings can create blockages and jamming, resulting in costly down time and may even result in the equipment being irretrievable.
- a build up of cuttings may result in a reduction in the flow of slurry to and from the drill head, it may place unnecessary loads on the drill head and stem assembly and may also cause the drill head to be wedged or jammed in the bore. Furthermore, with the increase in use of horizontal bores in well networks, a build up of cuttings on the lowermost or bottom surface of the bore may cause side displacement of the drill head which will result in the bore taking on a new and incorrect direction.
- flushing devices have been developed to assist in the clearing of the cuttings. These devices are incorporated with the drill stem assembly and, when in a closed condition allow the passage of the slurry to pass therethrough before proceeding to the drill head. When required the flushing device is caused to move to an open condition. In this condition a percentage of the slurry is diverted from the main flow passage, through ports located on the outside of the flushing device and into the annular space between the flushing device and the bore wall.
- the flushing device is remotely operated from the surface and typically requires the pumps to be switched off before the state of the flushing device may be changed.
- U.S. Pat. No. 6,161,632 Several of these flushing devices are referred to in U.S. Pat. No. 6,161,632.
- the invention disclosed in U.S. Pat. No. 6,161,632 provides a flushing device which remains in a closed state by the weight of the drill stem which acts downwardly. Relieving this weight by applying a relative pull upon the drill stem results in the flushing device moving to an open state, causing a predetermined percentage of the slurry to be diverted from the main passage into the annular space for as long as the weight of the drill stem assembly has been relieved.
- a compressive force must be maintained upon the flushing device.
- a tractive force must be maintained upon the flushing device. If the compressive or tractive force is not constantly applied to the flushing device during the required condition, the flushing device may automatically and uncontrollably move to the alternate condition.
- a further deficiency in this device is in relation to the bleed holes located on the outer wall of the tool. These bleed holes allow cuttings to get into the flushing device, contaminating the various parts within the flushing device and resulting in tool failure.
- This device relies on hydraulic pressure to achieve the required tensile loading. Owing to the configuration of the device, hydraulic lock can occur resulting in a build up of pressure. When the pressure builds beyond a predetermined value, a relieve disc bursts causing the device to default to an open state, requiring the drill stem assembly to be brought back to the surface so that the flushing device can be repaired or replaced.
- the present invention provides an actuating mechanism comprising:
- the first region is in the internal passage of the actuating mechanism.
- the second region is external of the actuating mechanism.
- the pressure in the second region may be transmitted to a third region located within the actuating mechanism.
- the third region is located substantially between the inner and outer members. In this arrangement a change in pressure in the second region affects the pressure in the third region.
- At least a section of the inner member is exposed to both the first and third regions.
- an inner surface of the inner member is exposed to the first region and an outer surface of the inner member is exposed to the third region.
- unequal forces are exerted across the inner member.
- this inequality reaches the predetermined value the actuating mechanism is caused to move between its first and second conditions.
- the inner member and outer members are in the form of pipes.
- the inner member may comprise a wash pipe which is configured to have a first end with an outer diameter larger than the outer diameter at the second end.
- the wash pipe has a portion having a tapered outer diameter. The portion may have a constant inner diameter.
- the wash pipe has a first seal assembly located along the outer diameter adjacent the first end and a second seal assembly located along the outer diameter adjacent the second end.
- first seal assembly and the second seal assembly each have at least one seal.
- the at least one seal of the second seal assembly has a smaller cross section than the at least one seal of the first seal assembly.
- the degree of change in pressure required between the first region and the second region to operate the actuating mechanism may be varied by changing the cross sectional diameter of the at least one seal of the second seal assembly.
- an internal portion of the outer member against which the second seal assembly slidingly engages can be varied according to changes in cross sectional diameter of the at least one seal in the second seal assembly.
- a cavity is defined between the inner member and outer member.
- the cavity is filled with a lubricant such as oil.
- the cavity may have an opening which opens into a chamber of an equalising device.
- the equalising device may be in the form of a floating sleeve which is slidingly retained on an outer portion of the outer member and which surrounds the chamber.
- volumetric changes in the cavity result in the floating sleeve moving with respect to the opening.
- the floating sleeve is in communication with the second region such that pressure in the second region is transmitted to the cavity.
- the cavity provides the third region.
- the cavity is sealed from the internal passage such that the cavity may not be contaminated.
- the cavity is also sealed from the area external the actuating mechanism to again ensure the cavity remains free from contamination. This ensures that the moving parts of the actuating mechanism are retained in an environment where contaminants cannot affect the operation of the actuating mechanism, increasing its reliability.
- the equalising device may also balance and cushion the movement between the inner and outer sleeve.
- the actuating mechanism comprises an indexing mechanism which indexes between a first position, wherein the actuating mechanism is in the first condition and a second position wherein the actuating mechanism is in the second condition.
- the indexing mechanism is located between the first and second members.
- the indexing mechanism operates within the cavity.
- the indexing mechanism engages the inner member.
- the indexing mechanism may comprise an indexing sleeve, a travel stop and a positioning sleeve.
- the indexing sleeve may be fixed rotationally to the inner member, this may be by way of a key way arrangement.
- the indexing sleeve is axially movable relative to the inner member.
- the travel stop may be mounted on the inner member such that it may rotate about the longitudinal axis thereof.
- the travel stop is substantially constrained against axial movement relative to the inner member.
- the positioning sleeve may be fixed rotationally to the inner member, this may be by way of a key way arrangement.
- the positioning sleeve is axially movable relative to the inner member.
- the indexing sleeve and travel stop may be biased away from each other.
- the biasing force may be provided by a first spring.
- the travel stop and positioning sleeve may also be biased away from each other.
- the biasing force may be provided by a second spring.
- the travel stop is adapted to co-operate with the indexing sleeve during the indexing sequence.
- the indexing sleeve may have a first end which provides a bottom face and a second end having a projection, defining a pawl, extending in an axial direction from the periphery of said second end.
- the travel stop may have a first end adapted to engage and mesh with the projection on the indexing sleeve and a second end adapted to engage and mesh with the positioning sleeve.
- a first end of the positioning sleeve is shaped to engage and mesh with the second end of the travel stop.
- the second end of the travel stop is configured to provide a plurality of fingers and corresponding slots, which co-act with corresponding fingers and slots integral with the positioning sleeve.
- Each finger and slot of the travel stop may terminate in at least one depression or trough.
- Each finger and slot of the positioning sleeve may terminate in at least one peak.
- Each peak may be complimentary in shape to each trough so that upon engagement each finger on the travel stop aligns with a finger and/or slot on the positioning sleeve depending on whether the indexing mechanism is in its first position or second position.
- the fingers on the travel stop align and mate with the fingers on the positioning sleeve. In this condition the fingers are opposed.
- the slots on the travel stop align and mate with the fingers on the positioning sleeve, whilst the fingers on the travel stop align and mate with the slots on the positioning sleeve. In this condition the fingers are interlaced.
- each finger and each slot on the travel stop each have one trough, and each finger and each slot on the positioning sleeve each have one peak.
- the actuating mechanism actuates, or cycles, between the first and second conditions in alternating fashion.
- each finger and each slot on the travel stop each have one trough, and each finger on the positioning sleeve has one peak, whilst each slot on the positioning sleeve has two peaks.
- the actuating mechanism actuates, or cycles, from first condition to second condition to second condition before returning to the first condition.
- indexing mechanism will obviously allow for a variety of different cycles depending on the number of troughs each finger and/or slot on the travel stop has, and/or the number of peaks each finger and/or slot on the positioning sleeve has.
- the peaks may be on the fingers and slots of the travel stop whilst the troughs may be on the fingers and slots on the positioning sleeve.
- the actuating mechanism may comprise at least one retention mechanism to releasably retain the actuating mechanism in one condition until the predetermined pressure differential between the first and third regions is reached whereupon the actuating mechanism is able to move from one condition to the other.
- the retention mechanism may be a detent.
- the retention mechanism may comprise a ball fixed relative to the inner member but biased radially outward from the inner member.
- the outer member may have a first groove and a second groove on its inner surface spaced a distance from each other. Preferably this distance is substantially equal in length to the axial distance the inner member moves relative to the outer member as the actuating mechanism moves between its first and second conditions.
- Each groove may be annular with a cross section complimentary to the ball so that the ball can be received therein and hold the inner member relative to the outer member.
- the ball may be fixed relative to the outer member and biased radially inward from the outer member
- the inner member may have the first groove and the second groove on its outer surface spaced a distance from each other substantially equal in length to the axial distance the inner member moves relative to the outer member as the actuating mechanism moves between its first and second conditions.
- the actuating mechanism is capable of flexing whilst still capable of effective operation.
- the actuating mechanism may incorporate a joint capable of allowing pivotal movement relative to the longitudinal axis.
- the joint is in the form of a knuckle joint and allows the inner member to pivot. The joint allows the actuating mechanism to operate effectively even when loads applied to the outer member cause it to deflect between its ends.
- the actuating mechanism is incorporated in an apparatus, such as a tool, for actuating the apparatus between first and second operational condition.
- the apparatus is a flushing device, whereby the actuating mechanism causes the flushing device to move between the first operable condition, wherein the flushing device is closed and the second operable condition wherein the flushing device is open.
- an inner sleeve of the flushing device comprises the inner member of the actuating mechanism
- an outer sleeve of the flushing device comprises the outer member of the actuating mechanism.
- the flushing device also has an internal passage which incorporates the internal passage of the actuating mechanism.
- the outer sleeve may incorporate openings. These openings may be blocked from the internal passage when the flushing device is in the closed operable condition, and register with the internal passage when the flushing device is in the open operable condition.
- the flushing device is configured such that the flushing device remains in the selected open or closed operable condition regardless of any expansive or compressive force.
- the openings provide a flushing outlet, whereby when the flushing device is in an open operable condition a predetermined percentage of the fluid is diverted from the passage.
- the flushing outlet preferably comprises a plurality of apertures in the inner sleeve, an annular chamber in the outer sleeve and a plurality of nozzles.
- the flushing outlet may form a passage between the annular chamber and the outside of the flushing device when the flushing device is in its open operable condition.
- Each nozzle may be shaped so as to direct diverted fluid backwards, away from the drill head.
- a fluid tight seal is provided between the inner and outer sleeve as the flushing device moves from a closed operable condition to an open operable condition.
- the flushing device may comprise an intermediate sleeve located between the inner and outer sleeve and located between the flushing outlet and the inlet of the flushing device to provide the fluid tight seal.
- the apparatus is an under reamer or casing cutter whereby the actuating mechanism causes the under reamer or casing cutter to move between a first operable condition, wherein a cutting device is contained within the under reamer or casing cutter, and a second operable condition wherein the cutting device protrudes from the under reamer or casing cutter to cut as required.
- the actuating mechanism may cause the cutting device to move between a first operable condition, wherein the cutting device is off, and a second operable condition wherein the cutting device is on.
- An under reamer is a tool used to smooth the wall of a well, enlarge the hole, help stabilize the bit, straighten the well bore and/or to drill directionally.
- the apparatus is a valve, such as a ball valve, whereby the actuating mechanism causes the valve to move between a first operable condition, wherein the valve is closed and a second operable condition wherein the valve is open.
- actuating mechanism also include the operation or activity of a packer, use in deep mineral ore drilling, use with single shot operation for permanent installations.
- the present invention also provides a flushing device comprising:
- the invention also provides a flushing device for flushing diverted fluid upwards into an annular space between a drill stem and a hole, where a slurry passes through a central passage of the flushing device to a drill head, whereupon it reverses direction, passing through the annular space before returning to the surface with cuttings from the drilling process suspended in the return slurry, the flushing device is adapted to change between an open operable condition, whereby a predetermined percentage of fluid is diverted from the passage to the annular space to assist in maintaining a clean bore, and a closed operable condition, whereby the full flow of the slurry is delivered to the drill head, and is configured such that the increase or reduction of pressure in the internal passage relative to the pressure external the flushing device causes an actuating mechanism located in the device to cycle between a first and second condition whereby the flushing device correspondingly cycles through open and closed operable conditions.
- the present invention also provides a flushing device comprising:
- FIG. 1 is a sectional view of the invention used in a flushing device
- FIG. 2 is a sectional view of the invention in a closed condition during operation
- FIG. 3 is a view similar to FIG. 2 but in an open condition
- FIG. 4 is a sectional view of the inlet end of the flushing device depicted in FIG. 1 ;
- FIG. 5 is a sectional view of the inlet end of the flushing device depicted in FIG. 2
- FIG. 6 is a sectional view of the inlet end of the flushing device depicted in FIG. 3
- FIG. 7 is a sectional view of the outlet end of the flushing device depicted in FIG. 1 ;
- FIG. 8 is a sectional view of the outlet end of the flushing device depicted in FIG. 2
- FIG. 9 is a sectional view of the outlet end of the flushing device depicted in FIG. 3
- FIG. 10 is a view of an indexing mechanism in an opposed relation
- FIG. 11 is a view similar to FIG. 4 but in an interlaced relation
- FIG. 12 is a view of the indexing mechanism according to the sequence of positions as it moves between an opposed to interlaced relation.
- the invention is in the form of an actuating mechanism 111 comprising an indexing mechanism 80 , an inner member 113 and an outer member 115 , which cooperates with the inner member 113 to provide an internal passage 117 through which fluid passes.
- the internal passage 117 also provides a first region 119 , whilst a second region 120 is defined by an area external to the outer member 115 .
- the actuating mechanism 111 is incorporated in a flushing device 20 .
- the flushing device 20 comprises an inner sleeve 21 and an outer sleeve 23 , which cooperate to provide a fluid passage 32 having an inlet 22 b and an outlet 22 a .
- the fluid passage 32 incorporates the internal passage 117 of the actuating mechanism 111 .
- the inner sleeve 21 comprises the inner member 113 of the actuating mechanism 111 and provides a plurality of apertures 38 spaced annually therearound, as shown in FIGS. 1 to 6 .
- the outer sleeve 23 of the flushing device 20 comprises the outer member 115 of the actuating mechanism 111 and defines the inlet 22 b and the outlet 22 a of the flushing device 20 .
- the outer sleeve 23 is adapted to be releasably incorporated in the drill stem assembly and provides a plurality of flushing outlets 33 .
- the flushing outlets 33 allow fluid to pass from passage 32 to the annular space between the flushing device 20 and the bore wall (not shown) when the flushing device 20 is in an open condition, as represented in FIG. 6 .
- Each flushing outlet 33 comprises an annular chamber 35 located on the inner face of the outer sleeve 23 , and a plurality of nozzle assemblies 36 in communication with the annular chamber 35 and spaced around the perimeter of the flushing device 20 .
- Each flushing outlet 33 extends obliquely outwards and backwards.
- the inner member 113 of the actuating mechanism 111 incorporates a portion called a wash pipe 121 .
- the wash pipe 121 has a constant internal diameter whilst a portion of the outer diameter tapers inwardly from a first end to a second end, the first end being closer to the inlet 22 b of the flushing device 20 .
- the inner member 113 has a second seal assembly 93 comprising a pair of seals 96 located along an outer diameter and adjacent its second end.
- the inner member 113 also incorporates a further set of seals 35 b comprising a pair of seals 95 adjacent the annular chamber 35 .
- the seals 96 of the second seal assembly 93 have a smaller cross section than the seals 95 of the set of seals 35 b.
- the actuating mechanism 111 also comprises a cavity 153 located between the inner member 113 and the outer member 115 .
- the cavity 153 defines a third region 122 .
- An internal portion 165 of the outer member 115 provides a surface 167 against which the second seal assembly 93 of the inner member slidingly engages.
- the pressure differential required between the first region 119 and the third region 122 in order for the actuating mechanism 111 to alternate between first and second conditions can be varied by changing the cross sectional diameter of the seals 96 in the second seal assembly 93 . Changes in cross sectional diameter of the seals 96 are accommodated by changes in the diameter of the internal portion 167 of the outer member 115 , against which the second seal assembly 93 slidably engages varies according to
- the indexing mechanism 80 is best shown in FIGS. 10 , 11 and 12 .
- the indexing mechanism 80 comprises an indexing sleeve 29 , rotating travel stop 62 , and a positioning sleeve 129 .
- the inner sleeve 29 provides a pawl 68 projecting from an end thereof.
- the indexing sleeve 29 is rotationally fixed relative to the inner member 113 by a key way arrangement 131 .
- the indexing sleeve 29 also comprises a projection 29 a extending inwardly from a first end of the indexing sleeve 29 , as best shown in FIG. 10 .
- the portion 29 a of the indexing sleeve 29 provides a face upon which first spring 67 acts to bias the indexing sleeve 29 towards a shoulder 171 on the internal surface of the outer member 115 .
- the positioning sleeve 129 comprises a plurality of fingers 28 a and slots 28 b which are configured to provide a peak at their periphery.
- the positioning sleeve 129 is rotationally fixed relative to the inner member 113 by a key way arrangement 133 , as shown in FIG. 1 .
- the outer member 115 provides a shoulder 163 against which the positioning sleeve 129 abuts.
- the rotating travel stop 62 provides a ratchet 69 comprising a plurality of indents 69 a which are adapted to receive pawl 68 .
- each indent 69 a comprise a ramp 69 b which slidingly engages pawl 68 .
- Travel stop 62 also provides a plurality of fingers 27 a and slots 27 b which are configured to provide a trough at their periphery. These troughs mate with corresponding peaks of the positioning sleeve 129 when the travel stop 62 engages therewith.
- the operation of the indexing mechanism 80 is best described with reference to FIG. 12 . Movement of the inner member 113 towards an inlet of the internal passage 117 with respect to the outer member 115 will result in a bottom face 70 of the indexing sleeve 29 abutting shoulder 171 of the outer member 115 , preventing further downward movement of the indexing sleeve 29 .
- the fingers 27 a do not entirely align with slots 28 a .
- continued upward movement of the inner member 113 results in the fingers 27 a sliding over the fingers 28 a causing further rotation of the travel stop 62 until the fingers 27 a align with slots 28 a of the positioning sleeve 129 , such that the fingers are interlaced.
- Continued upward movement of the inner member 113 will result in the engagement of the fingers 27 a with the slots 28 b .
- the actuating mechanism 111 is in its second condition, and the flushing device 20 is in its open operable condition, as shown in FIG. 1 .
- a similar process will in turn cause the rotating travel stop 62 to be indexed to a second position whereby the fingers 27 a align with fingers 28 a such that they are in an opposed relation.
- the actuating mechanism 11 is in its first position, and the axial movement of the inner member 113 is sufficient only for the pawl 68 to disengage the ratchet 69 .
- the axial movement of the rotating travel stop 62 is restricted to the movements of the inner member 113 . Downward movement of the travel stop 62 relative to inner member 113 is prevented by shoulder 139 .
- the biasing force exerted by second spring 127 prevents upward movement of the travel stop 62 relative to the inner member 113 .
- the rotational movement of the travel stop 62 is governed by the flushing device 20 and the travel stops 62 position with respect to indexing sleeve 29 , and fingers 28 a and slots 28 b.
- the actuating mechanism 111 also comprises a retention mechanism 141 to releasably retain the actuating mechanism 111 in one condition until the predetermined pressure differential between the first region 119 and third region 122 is reached, whereupon the actuating mechanism 111 is permitted to move from one condition to the other.
- the retention mechanism 141 is provided by a plurality of detents comprising a ball 143 fixed axially relative to the inner member 113 but biased radially outwardly from the inner member by detent spring 145 .
- the outer member 115 has a first groove 147 and a second groove 149 on the inner surface, each being spaced a distance from each other substantially equal in length to the axial distance the inner member 113 moves relative to the outer member 115 when the actuating mechanism 111 moves between its first and second conditions.
- Each groove 147 , 149 is annular and has a cross section complimentary to that of the ball 143 such that the ball 143 is snugly received therein so as to hold the inner member 113 relative to the outer member 115 .
- the ball 143 In operation, when the actuating mechanism 111 is in its first condition the ball 143 is received in the first groove 147 , as shown in FIG. 1 . As the pressure difference between the first region 119 and third region increases to a predetermined value, the ball 143 is forced inwardly by the action of the axial force on the inner member 113 caused by the pressure of the fluid flowing through the passage. When the ball 143 is caused to disengage from the first groove 147 , the inner member 113 moves rapidly to either an intermediate position between the first groove 147 and second groove 149 , as shown in FIG. 2 , or until the actuating mechanism 111 is in its second condition, as shown in FIG. 3 , wherein the ball 143 aligns and engages with the second groove 149 , whereby the actuating mechanism 111 is held in its second condition.
- the extent to which the inner member 113 moves with respect to the outer member 115 is dependant on the position of the indexing mechanism 80 . If the indexing mechanism 80 is in its first position the fingers of the travel stop 62 are in opposed relation to the fingers on the positioning sleeve 129 . This restricts the axial movement of the inner member 113 with respect to the outer member 115 so that the inner member 113 is only able to move to an intermediate position between the first and second grooves as best shown in FIG. 2 .
- the fingers of the travel stop 62 are interlaced with the fingers on the positioning sleeve 129 . This allows for greater axial movement of the inner member 113 with respect to the outer member 115 so that the actuating mechanism 111 is able to move to its second condition, as shown in FIG. 3 .
- the actuating mechanism 111 incorporates a knuckle joint 151 capable of allowing pivotal movement of the inner member 113 relative to its longitudinal axis.
- the knuckle joint 151 allows the actuating mechanism 111 to operate effectively even when loads applied to the outer member 115 cause it to deflect between its ends.
- the cavity 153 defined between the inner member 113 and the outer member 115 , filled with a lubricant such as oil.
- the cavity 153 which is sealed to prevent the ingress of any contaminants, houses the indexing mechanism 80 and the retention mechanism 141 , and ensures reliable conditions for the functioning of these components.
- the actuating mechanism 111 incorporates an equalising device 155 .
- the equalising device comprises a floating sleeve 157 which is slidingly retained on an outer portion 159 of the outer member 115 , and provides a chamber 161 which is in fluid communication with the cavity 153 through an opening 154 . As the inner member 113 moves, the volume of the cavity 153 changes accordingly.
- the lubricant exits the cavity 153 through opening 154 and into the chamber 161 , causing the floating sleeve 157 to move accordingly to allow for the increase in volume in the chamber 161 .
- the floating sleeve 157 moves relative to the opening 154 to accommodate volumetric changes within the cavity 153 .
- the floating sleeve 157 is in communication with the second region 120 .
- the pressure in the second region 120 is transmitted to the chamber 161 and the cavity 153 .
- the pressure, and volume, of the third region 122 provided by the cavity 153 is representative of the pressure in the second region 120 .
- the pressure in the second region 120 affects the operation of the actuating mechanism 111 .
- the equalising device 155 balances and cushions the movement between the inner and outer members.
- the outer member 115 also provides a port 37 which is in communication with the cavity 153 allowing it to be filled with lubricant if so required.
- the equalising device 155 is provided with seals to seal the interface between the floating sleeve 157 and the outer member 115 .
- the flushing device 20 also comprises an intermediate sleeve 42 located between the inner sleeve 21 and the outer sleeve 23 .
- the intermediate sleeve 42 comprises a outwardly extending shoulder 46 at its first end, and terminates at its other end with a sloping face 42 a .
- the sloping face 42 a mates with upwardly sloping face 42 b located on the inner sleeve 21 to provide a seat.
- the intermediate sleeve 42 also contains a plurality of holes 43 which receives a plurality of balls 44 .
- Each ball 44 has a diameter greater than the radial thickness of the intermediate sleeve 42 such that when the intermediate sleeve 42 is at its lower most position each ball 44 protrudes beyond the interface between the intermediate sleeve and the inner sleeve 21 and rests against the downwardly sloping face 45 of the inner sleeve 21 .
- the mating of seat portion 42 a of the intermediate sleeve 42 with the upwardly sloping face 42 b of the inner sleeve 21 is at a predetermined distance from the plurality of holes 43 such that the balls 44 are not permitted to enter aperture 38 .
- the intermediate sleeve 42 is rotationally fixed to the outer sleeve 23 by key way arrangement 142 . This arrangement assists in ensuring the interface between the intermediate sleeve 42 and outer sleeve 23 does not become clogged with fluid (slurry) passing through the flushing device 20 .
- the operation of the intermediate sleeve 42 ensures the apertures 38 remain closed until the aperture 38 begins to align with annular chamber 35 of the flushing outlet 33 .
- a gap is introduced between the sloping face 42 b and conical face 42 a , the passage which allows the fluid to pass from the passage 32 , through the slots 38 and through the flushing outlet 33 opens.
- the annular chamber 35 has a set of seals 35 a , 35 b adjacent each side thereof. These seals render the interface between the inner sleeve 21 and outer sleeve 23 fluid tight, preventing slurry passing from the passage 32 and into the interface and the cavity 153 when the flushing device 20 is in an open operable condition.
- a first section 49 a of the inner sleeve 21 co-acts with seals 35 a to provide a seal.
- the intermediate sleeve 42 moves upwardly to co-act with the seals 35 a and provide a seal below the annular chamber 35 , preventing fluid passing through the apertures 38 and ingressing between the inner sleeve 21 and outer sleeve 23 .
- the inner member 113 moves downwardly relative to the outer member 115 , providing a barrier between the inner passage 32 and the annular chamber 35 of the flushing outlet 33 .
- the inner member 113 will result in the sloping face 42 b abutting mating conical face 42 a of the intermediate sleeve 42 whilst simultaneously the downwardly facing slope 45 passes groove 48 .
- the plurality of balls 44 will then be forced to move in an inward direction resulting in the intermediate sleeve engaging the inner sleeve 21 to move downwardly with further downward movement of the inner sleeve 21 .
- Sloping face 42 b and conical face 42 a remain in intimate contact until they have passed seals 35 a.
- the operation of the flushing device 20 between an open operable condition and a closed operable condition, and vice versa, is extremely simple and reliable, and allows the flushing device 20 to remain in the required condition by maintaining a predetermined pressure differential between the first region 119 and third region 122 .
- the passage 32 through which fluid passes is partly defined by the inner wall of the inner sleeve 21 .
- This inner Wall substantially provides a barrier, preventing the ingress of slurry in to the cavities between the inner sleeve 21 and outer sleeve 23 . Where apertures 38 are provided, seals are provided to prevent leakage of the slurry.
- the indexing mechanism 80 is arranged such that the fingers 27 a are in opposed relation with fingers 28 a , as shown in FIGS. 2 , 5 , 8 and 12 a . In this mode the flushing outlet 33 is closed.
- the surface pumps are momentarily switched off such that no slurry is passing through the flushing device 20 .
- the travel stop 62 is free to move in the same axial direction, being biased to do so as the second spring 127 forces the travel stop 62 to disengage from the positioning sleeve 129 .
- the pumps are then started and the pressure in the first region 119 increases.
- the pressure differential between the first region 119 and third region 122 is large enough to overcome the force of the ball 145 acting in the first groove 147 , the ball 147 disengages the first groove 147 and the inner member 113 is caused to move rapidly with respect to the outer member 115 .
- the ball 143 of the retention mechanism 141 is aligned with the second groove 149 , whereupon the ball 143 engages the second groove 149 holding the inner member 113 relative to the outer member 115 , as shown in FIG. 2 .
- the retention mechanism 141 prevents the closure of the flushing outlet 33 until the force exerted by spring 127 is able to overcome both the force of the retention mechanism 141 holding the inner member 113 relative to the outer member 115 , and the pressure differential between the first region 119 and the third region 122 .
- a percentage of fluid is diverted from passage 32 through flushing outlet 33 , exiting from the flushing device 20 into the annular space between flushing device 20 and the wall of the bore.
- the percentage of fluid diverted is largely dependant on the size of the orifice of nozzle assembly 36 , and may be adjusted accordingly.
- the diverted fluid is used to assist in cleaning the bore of cuttings.
- the pressure differential between the first region 119 and third region 122 is reduced so that the force of spring 127 is greater than the force exerted by the retention mechanism 141 , at which point the ball 143 disengages the second groove 149 , allowing the inner member 113 to rapidly move with respect to the outer member 115 towards the inlet 22 b .
- the travel stop 62 disengages from the positioning sleeve 129 and moves towards the indexing sleeve 29 , ready to cycle to a new position.
- the troughs 81 of fingers 27 a engage the peaks 82 of fingers 28 a of the positioning sleeve 129 so that the fingers are in opposed configuration, as best shown in FIG. 12 a .
- the inner member 113 is prevented from full axial movement relative to the outer member 115 due to fingers 28 a and 27 a being in opposed relation.
- the flushing device 20 is in a closed operable condition, as shown in FIG. 2 .
- the switching between the two conditions of the flushing device 20 may be controlled remotely by the operator on the surface.
- the operator will know to activate and deactivate the flushing device 20 according to the behaviour of the drilling stem assembly, the drilling head, and the slurry which is being returned to the surface.
- the operational condition of the flushing device 20 can only be changed by deliberate actions on the part of the operator.
- the flushing device 20 may be placed anywhere along the drilling stem assembly, its position depending on the application. Indeed the drilling of a well may require the inclusion of one or more flushing devices 20 to be used to maintain the required conditions in the bore.
- the surface of the components are coated with a hard, wear resistant coating and ground to a fine finish in order to prevent scouring of the surface by the action of the drilling fluid. This also assists in prolonging the life of the seals.
- the required pressure differential between the first region 119 and third region 122 can be varied by varying the force exerted by detent spring 145 on ball 143 .
- the retaining mechanism 141 provides a retaining force equal to or slightly greater than the load differential of the spring 127 as it is compressed from its original length (flushing device 20 in its closed operable condition) to its compressed length (flushing device 20 in its open operable condition).
- the wash pipe 121 (and therefore inner member 113 and inner sleeve 23 ) will not move until the pressure differential is sufficient to fully compress spring 127 .
- the ball 143 is forced to retract and the wash pipe 121 will snap to the fully open condition (when fingers of indexing mechanism 80 are interlaced), where the ball 143 will engage the second groove 149 , such that the flushing device 20 is in its open operable condition.
- the retention mechanism 141 Upon falling pressure, the retention mechanism 141 holds the flushing device 20 open until the pressure differential falls below the force generated by the spring 127 , at which point the ball 143 will retract from the second groove 149 and the wash pipe 121 will snap back, moving the flushing device 20 to its closed operable condition.
- the retention mechanism 141 also prevents partial opening and closing of the actuating mechanism 111 .
- the ball 143 retracts from the appropriate groove (depending upon position) and the actuating mechanism snaps into its next condition—there being no gradual movement between the first and second conditions of the actuating mechanism 111 .
- pressure differential required to operate the actuating mechanism may be varied by varying the diameter of the seals 96 of the second seal assembly 93 , as previously discussed. This does not however affect the ratio between opening and closing pressures.
- the flushing device 20 does not include the intermediate sleeve 42 .
- the inner sleeve 21 is configured to ensure a fluid tight seal exists between the inner sleeve and the outer sleeve.
- the invention can be used in relation to many other applications. For instance, it may be used in operating or actuating a ball valve or any type of valve, an under reamer or casing cutter, it can be easily converted to a single shot operation for a permanent installation, and it may be used for deep mineral air drilling.
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Abstract
An actuating mechanism (111) comprising an inner member (113) and an outer member (115) axially slidable relative to each other, the inner and outer members (113, 115) cooperating to define an internal passage (117) for the flow of a fluid therethrough. The inner member (113) being configured such that upon a predetermined change in pressure between a first region (119) and a second region (120) the actuating mechanism (111) is caused to move between a first condition and a second condition.
Description
- The present invention generally relates to an actuating mechanism for use in an apparatus to effect movement of the apparatus between two or more modes of operation. For instance, the actuating mechanism can be used in a flushing device incorporated in a drilling stem used in mining to open and shut the device.
- The current invention can be applied in many different types of tools and devices. For instance it may be incorporated in under reamers, casing cutters, ball valves and other type of valves, packers and tools for deep mineral air drilling.
- The invention would also be useful in flushing devices used in drilling strings in oil and gas explorations and extraction. As well paths in exploration and extraction activities in mining industries become increasingly longer and the network more complicated, new challenges are constantly being faced in the area of well boring. One of these challenges is in respect of maintaining suitable conditions for the operation of the drill head or bit to cut through the medium.
- When drilling well bores, slurry, used to operate the drill head, is pumped from the surface through a drill stem assembly to the drill head. This slurry, upon reaching the end of the bore is caused to return to the surface, passing through the annular space between the sidewalls of the bore and the drill stem assembly before reaching the surface, whereby the returning slurry suspends the cuttings, made during the drilling process, transporting them back to the surface. The removal of the cuttings ensures the bore remains relatively clean, providing optimal conditions for drilling. Failure to remove the cuttings, or a suitable percent of the cuttings can create blockages and jamming, resulting in costly down time and may even result in the equipment being irretrievable.
- A build up of cuttings may result in a reduction in the flow of slurry to and from the drill head, it may place unnecessary loads on the drill head and stem assembly and may also cause the drill head to be wedged or jammed in the bore. Furthermore, with the increase in use of horizontal bores in well networks, a build up of cuttings on the lowermost or bottom surface of the bore may cause side displacement of the drill head which will result in the bore taking on a new and incorrect direction.
- Several areas of the drilling process have been investigated and improvements have been made which enhance the process of returning the cuttings to the surface. These solutions have included improvements to the slurry composition used to drive the drill head, as well as improvements to the actual drill head and the speed in which it may operate. However, improvements are still required in order to increase and improve the removal of cuttings from the bore.
- Increasing the flow rate of the slurry and hence the return rate of the slurry to the surface does not sufficiently solve the problem. Owing to the narrow gap of the annular space, cuttings still tend to collect in this area. This not only inhibits the drilling process but is also problematic when introducing pipe linings. Also during subsequent cementing, additional problems are experienced if the hole is not clean.
- Several mechanical flushing devices have been developed to assist in the clearing of the cuttings. These devices are incorporated with the drill stem assembly and, when in a closed condition allow the passage of the slurry to pass therethrough before proceeding to the drill head. When required the flushing device is caused to move to an open condition. In this condition a percentage of the slurry is diverted from the main flow passage, through ports located on the outside of the flushing device and into the annular space between the flushing device and the bore wall. The flushing device is remotely operated from the surface and typically requires the pumps to be switched off before the state of the flushing device may be changed.
- As the annular space between the drill stem assembly and the bore wall is particularly narrow, it is often the cause of packing or wedging of cuttings in this region. It is therefore highly desirable to keep this region clear. Hence, diverting a portion of the fluid as it passes through the flushing member to the annular space assists in flushing this area and maintaining a clear passage for the flow of return fluid and cuttings to the surface.
- Several of these flushing devices are referred to in U.S. Pat. No. 6,161,632. The invention disclosed in U.S. Pat. No. 6,161,632 provides a flushing device which remains in a closed state by the weight of the drill stem which acts downwardly. Relieving this weight by applying a relative pull upon the drill stem results in the flushing device moving to an open state, causing a predetermined percentage of the slurry to be diverted from the main passage into the annular space for as long as the weight of the drill stem assembly has been relieved.
- Subsequent, to the return of the weight loading, the ports close and the full flow of the slurry is again delivered to the drill head allowing the drilling process to continue.
- Hence, in order to maintain the flushing device in a closed state a compressive force must be maintained upon the flushing device. Similarly, in order to maintain the flushing device in an open state a tractive force must be maintained upon the flushing device. If the compressive or tractive force is not constantly applied to the flushing device during the required condition, the flushing device may automatically and uncontrollably move to the alternate condition.
- The outer valve part and inner valve part of the flushing device disclosed in U.S. Pat. No. 6,161,632 are connected in permanent rotation via key and keyway slots between the valve parts. The manner in which these parts are coupled together result in high concentrations in forces at this junction, leading to failures at this interface, requiring costly repairs to be made.
- A further deficiency in this device is in relation to the bleed holes located on the outer wall of the tool. These bleed holes allow cuttings to get into the flushing device, contaminating the various parts within the flushing device and resulting in tool failure.
- Another type of flushing device currently available overcomes some of the deficiencies of the device disclosed in U.S. Pat. No. 6,161,632 in that a tractive force does not need to be maintained upon the device in order for it to remain open. However, a compressive force must be maintained in order to keep the device in a closed state. Loss of compression will automatically result in the tool moving to an open state, regardless of whether the surface pump(s) are in operation or not. This is undesirable during a drilling operation. Furthermore, this particular device is constructed such that the major moving components operate in the slurry, leading to reliability problems with the parts. Similarly to U.S. Pat. No. 6,161,632, breather ports also allow cuttings to enter the device, causing additional problems in relation to the reliability of the device.
- This device relies on hydraulic pressure to achieve the required tensile loading. Owing to the configuration of the device, hydraulic lock can occur resulting in a build up of pressure. When the pressure builds beyond a predetermined value, a relieve disc bursts causing the device to default to an open state, requiring the drill stem assembly to be brought back to the surface so that the flushing device can be repaired or replaced.
- Further variations of these type of tools have also been developed. However, they often comprise many moving parts, which reduce the reliability of the tool, particularly in the operational conditions experienced, and/or require components to mechanically lock with other components, which under sufficient pressure result in the failing or deformation of these components, rendering the tool useless.
- The preceding discussion of the background to the invention is intended only to facilitate an understanding of the present invention. It should be appreciated that the discussion is not an acknowledgement or admission that any of the material referred to was part of the common general knowledge in Australia as at the priority date of the application.
- It is against this background, and the problems and disadvantages associated therewith, that the present invention has been developed.
- The present invention provides an actuating mechanism comprising:
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- an inner member and an outer member axially slidable relative to each other, the inner and outer members cooperating to define an internal passage for the flow of a fluid therethrough;
- the inner member being configured such that upon a predetermined change in pressure between a first region and a second region the actuating mechanism is caused to move between a first condition and a second condition.
- Preferably the first region is in the internal passage of the actuating mechanism.
- Preferably the second region is external of the actuating mechanism. The pressure in the second region may be transmitted to a third region located within the actuating mechanism. Preferably the third region is located substantially between the inner and outer members. In this arrangement a change in pressure in the second region affects the pressure in the third region.
- Preferably at least a section of the inner member is exposed to both the first and third regions. Preferably an inner surface of the inner member is exposed to the first region and an outer surface of the inner member is exposed to the third region. When there is a pressure difference between these regions unequal forces are exerted across the inner member. Preferably when this inequality reaches the predetermined value the actuating mechanism is caused to move between its first and second conditions.
- Preferably the inner member and outer members are in the form of pipes.
- The inner member may comprise a wash pipe which is configured to have a first end with an outer diameter larger than the outer diameter at the second end. Preferably the wash pipe has a portion having a tapered outer diameter. The portion may have a constant inner diameter.
- Preferably the wash pipe has a first seal assembly located along the outer diameter adjacent the first end and a second seal assembly located along the outer diameter adjacent the second end. Preferably the first seal assembly and the second seal assembly each have at least one seal. Preferably the at least one seal of the second seal assembly has a smaller cross section than the at least one seal of the first seal assembly.
- The degree of change in pressure required between the first region and the second region to operate the actuating mechanism may be varied by changing the cross sectional diameter of the at least one seal of the second seal assembly. Preferably an internal portion of the outer member against which the second seal assembly slidingly engages can be varied according to changes in cross sectional diameter of the at least one seal in the second seal assembly.
- Preferably a cavity is defined between the inner member and outer member. Preferably the cavity is filled with a lubricant such as oil. The cavity may have an opening which opens into a chamber of an equalising device. The equalising device may be in the form of a floating sleeve which is slidingly retained on an outer portion of the outer member and which surrounds the chamber. Preferably, volumetric changes in the cavity result in the floating sleeve moving with respect to the opening. Preferably the floating sleeve is in communication with the second region such that pressure in the second region is transmitted to the cavity. Preferably the cavity provides the third region.
- Preferably the cavity is sealed from the internal passage such that the cavity may not be contaminated. Preferably the cavity is also sealed from the area external the actuating mechanism to again ensure the cavity remains free from contamination. This ensures that the moving parts of the actuating mechanism are retained in an environment where contaminants cannot affect the operation of the actuating mechanism, increasing its reliability.
- The equalising device may also balance and cushion the movement between the inner and outer sleeve.
- Preferably the actuating mechanism comprises an indexing mechanism which indexes between a first position, wherein the actuating mechanism is in the first condition and a second position wherein the actuating mechanism is in the second condition.
- Preferably the indexing mechanism is located between the first and second members. Preferably the indexing mechanism operates within the cavity. Preferably the indexing mechanism engages the inner member. The indexing mechanism may comprise an indexing sleeve, a travel stop and a positioning sleeve.
- The indexing sleeve may be fixed rotationally to the inner member, this may be by way of a key way arrangement. Preferably the indexing sleeve is axially movable relative to the inner member.
- The travel stop may be mounted on the inner member such that it may rotate about the longitudinal axis thereof. Preferably the travel stop is substantially constrained against axial movement relative to the inner member.
- The positioning sleeve may be fixed rotationally to the inner member, this may be by way of a key way arrangement. Preferably the positioning sleeve is axially movable relative to the inner member.
- The indexing sleeve and travel stop may be biased away from each other. The biasing force may be provided by a first spring. The travel stop and positioning sleeve may also be biased away from each other. The biasing force may be provided by a second spring.
- Preferably the travel stop is adapted to co-operate with the indexing sleeve during the indexing sequence.
- The indexing sleeve may have a first end which provides a bottom face and a second end having a projection, defining a pawl, extending in an axial direction from the periphery of said second end.
- The travel stop may have a first end adapted to engage and mesh with the projection on the indexing sleeve and a second end adapted to engage and mesh with the positioning sleeve. Preferably a first end of the positioning sleeve is shaped to engage and mesh with the second end of the travel stop.
- Preferably the second end of the travel stop is configured to provide a plurality of fingers and corresponding slots, which co-act with corresponding fingers and slots integral with the positioning sleeve. Each finger and slot of the travel stop may terminate in at least one depression or trough. Each finger and slot of the positioning sleeve may terminate in at least one peak. Each peak may be complimentary in shape to each trough so that upon engagement each finger on the travel stop aligns with a finger and/or slot on the positioning sleeve depending on whether the indexing mechanism is in its first position or second position.
- Preferably when the indexing mechanism is in its first position the fingers on the travel stop align and mate with the fingers on the positioning sleeve. In this condition the fingers are opposed.
- Preferably when the indexing mechanism is in its second position the slots on the travel stop align and mate with the fingers on the positioning sleeve, whilst the fingers on the travel stop align and mate with the slots on the positioning sleeve. In this condition the fingers are interlaced.
- In one configuration of the indexing mechanism each finger and each slot on the travel stop each have one trough, and each finger and each slot on the positioning sleeve each have one peak.
- In this configuration the actuating mechanism actuates, or cycles, between the first and second conditions in alternating fashion.
- In another configuration of the indexing mechanism each finger and each slot on the travel stop each have one trough, and each finger on the positioning sleeve has one peak, whilst each slot on the positioning sleeve has two peaks.
- In this configuration the actuating mechanism actuates, or cycles, from first condition to second condition to second condition before returning to the first condition.
- Other configurations of the indexing mechanism will obviously allow for a variety of different cycles depending on the number of troughs each finger and/or slot on the travel stop has, and/or the number of peaks each finger and/or slot on the positioning sleeve has.
- Obviously, the peaks may be on the fingers and slots of the travel stop whilst the troughs may be on the fingers and slots on the positioning sleeve.
- The actuating mechanism may comprise at least one retention mechanism to releasably retain the actuating mechanism in one condition until the predetermined pressure differential between the first and third regions is reached whereupon the actuating mechanism is able to move from one condition to the other.
- The retention mechanism may be a detent.
- The retention mechanism may comprise a ball fixed relative to the inner member but biased radially outward from the inner member. The outer member may have a first groove and a second groove on its inner surface spaced a distance from each other. Preferably this distance is substantially equal in length to the axial distance the inner member moves relative to the outer member as the actuating mechanism moves between its first and second conditions. Each groove may be annular with a cross section complimentary to the ball so that the ball can be received therein and hold the inner member relative to the outer member.
- Alternatively, the ball may be fixed relative to the outer member and biased radially inward from the outer member, the inner member may have the first groove and the second groove on its outer surface spaced a distance from each other substantially equal in length to the axial distance the inner member moves relative to the outer member as the actuating mechanism moves between its first and second conditions.
- Preferably the actuating mechanism is capable of flexing whilst still capable of effective operation. The actuating mechanism may incorporate a joint capable of allowing pivotal movement relative to the longitudinal axis. Preferably the joint is in the form of a knuckle joint and allows the inner member to pivot. The joint allows the actuating mechanism to operate effectively even when loads applied to the outer member cause it to deflect between its ends.
- Preferably the actuating mechanism is incorporated in an apparatus, such as a tool, for actuating the apparatus between first and second operational condition.
- In one aspect of the invention the apparatus is a flushing device, whereby the actuating mechanism causes the flushing device to move between the first operable condition, wherein the flushing device is closed and the second operable condition wherein the flushing device is open.
- Preferably an inner sleeve of the flushing device comprises the inner member of the actuating mechanism, whilst an outer sleeve of the flushing device comprises the outer member of the actuating mechanism. The flushing device also has an internal passage which incorporates the internal passage of the actuating mechanism.
- The outer sleeve may incorporate openings. These openings may be blocked from the internal passage when the flushing device is in the closed operable condition, and register with the internal passage when the flushing device is in the open operable condition.
- Preferably the flushing device is configured such that the flushing device remains in the selected open or closed operable condition regardless of any expansive or compressive force.
- When in use the inner sleeve and outer sleeve are in mutual support.
- Preferably the openings provide a flushing outlet, whereby when the flushing device is in an open operable condition a predetermined percentage of the fluid is diverted from the passage.
- The flushing outlet preferably comprises a plurality of apertures in the inner sleeve, an annular chamber in the outer sleeve and a plurality of nozzles. The flushing outlet may form a passage between the annular chamber and the outside of the flushing device when the flushing device is in its open operable condition. Each nozzle may be shaped so as to direct diverted fluid backwards, away from the drill head.
- Preferably a fluid tight seal is provided between the inner and outer sleeve as the flushing device moves from a closed operable condition to an open operable condition. The flushing device may comprise an intermediate sleeve located between the inner and outer sleeve and located between the flushing outlet and the inlet of the flushing device to provide the fluid tight seal.
- In another aspect of the invention the apparatus is an under reamer or casing cutter whereby the actuating mechanism causes the under reamer or casing cutter to move between a first operable condition, wherein a cutting device is contained within the under reamer or casing cutter, and a second operable condition wherein the cutting device protrudes from the under reamer or casing cutter to cut as required. Alternatively the actuating mechanism may cause the cutting device to move between a first operable condition, wherein the cutting device is off, and a second operable condition wherein the cutting device is on. An under reamer is a tool used to smooth the wall of a well, enlarge the hole, help stabilize the bit, straighten the well bore and/or to drill directionally.
- In another aspect of the invention the apparatus is a valve, such as a ball valve, whereby the actuating mechanism causes the valve to move between a first operable condition, wherein the valve is closed and a second operable condition wherein the valve is open.
- Other applications of the actuating mechanism also include the operation or activity of a packer, use in deep mineral ore drilling, use with single shot operation for permanent installations.
- The present invention also provides a flushing device comprising:
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- an inner sleeve and an outer sleeve, moveable relative to each other between an open operable condition, wherein a percentage of the fluid passing through a central passage of the flushing device can be diverted through a plurality of flushing outlets, and a closed operable condition, wherein the fluid outlets are blocked from the passage,
- an actuating mechanism operable between the inner and outer sleeves, and having first and second conditions which correspond to the open and closed operable conditions, the actuating mechanism being responsive to a fluid pressure differential between a cavity defined between the inner and outer sleeves, and the pressure in the internal passage, for movement between its first and second conditions, whereby the actuating mechanism, when in the first or second condition couples the inner sleeve to the outer sleeve to prevent movement of the inner sleeve relative to the outer sleeve until predetermined value of pressure differential is reached.
- The invention also provides a flushing device for flushing diverted fluid upwards into an annular space between a drill stem and a hole, where a slurry passes through a central passage of the flushing device to a drill head, whereupon it reverses direction, passing through the annular space before returning to the surface with cuttings from the drilling process suspended in the return slurry, the flushing device is adapted to change between an open operable condition, whereby a predetermined percentage of fluid is diverted from the passage to the annular space to assist in maintaining a clean bore, and a closed operable condition, whereby the full flow of the slurry is delivered to the drill head, and is configured such that the increase or reduction of pressure in the internal passage relative to the pressure external the flushing device causes an actuating mechanism located in the device to cycle between a first and second condition whereby the flushing device correspondingly cycles through open and closed operable conditions.
- The present invention also provides a flushing device comprising:
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- an inner sleeve, slidingly received in an outer sleeve, the inner and outer sleeves cooperating to define an internal passage for the flow of a fluid, and are permanently coupled such that there is no rotational movement between the two sleeves;
- the outer sleeve having a plurality of flushing outlets
- an actuating mechanism comprising an inner and outer member, incorporated within the inner and outer sleeves, an internal passage which is common with the internal passage of the flushing device, the actuating mechanism being caused to cycle between open and closed conditions with change in the pressure differential acting upon the inner member;
- an indexing mechanism which indexes as a result of the operation of the actuating mechanism, the indexing mechanism indexes between first and second positions such that the flushing device moves between an open operable condition, whereby the plurality of flushing outlets are open for discharging a quantity of the fluid from the internal passage, and a closed operable condition, whereby the plurality of flushing outlets are closed, the operable condition depending on the position of the indexing mechanism.
- The invention will be better understood by reference to the following description of a specific embodiment thereof as shown in the accompanying drawings in which:
-
FIG. 1 is a sectional view of the invention used in a flushing device; -
FIG. 2 is a sectional view of the invention in a closed condition during operation; -
FIG. 3 is a view similar toFIG. 2 but in an open condition; -
FIG. 4 is a sectional view of the inlet end of the flushing device depicted inFIG. 1 ; -
FIG. 5 is a sectional view of the inlet end of the flushing device depicted inFIG. 2 -
FIG. 6 is a sectional view of the inlet end of the flushing device depicted inFIG. 3 -
FIG. 7 is a sectional view of the outlet end of the flushing device depicted inFIG. 1 ; -
FIG. 8 is a sectional view of the outlet end of the flushing device depicted inFIG. 2 -
FIG. 9 is a sectional view of the outlet end of the flushing device depicted inFIG. 3 -
FIG. 10 is a view of an indexing mechanism in an opposed relation; -
FIG. 11 is a view similar toFIG. 4 but in an interlaced relation; -
FIG. 12 is a view of the indexing mechanism according to the sequence of positions as it moves between an opposed to interlaced relation. - The invention according to an embodiment is in the form of an actuating mechanism 111 comprising an
indexing mechanism 80, aninner member 113 and anouter member 115, which cooperates with theinner member 113 to provide aninternal passage 117 through which fluid passes. Theinternal passage 117 also provides afirst region 119, whilst asecond region 120 is defined by an area external to theouter member 115. - Referring to
FIGS. 1 to 9 the actuating mechanism 111 is incorporated in aflushing device 20. - The
flushing device 20, comprises aninner sleeve 21 and anouter sleeve 23, which cooperate to provide afluid passage 32 having aninlet 22 b and anoutlet 22 a. Thefluid passage 32 incorporates theinternal passage 117 of the actuating mechanism 111. - The
inner sleeve 21 comprises theinner member 113 of the actuating mechanism 111 and provides a plurality ofapertures 38 spaced annually therearound, as shown inFIGS. 1 to 6 . - The
outer sleeve 23 of theflushing device 20, comprises theouter member 115 of the actuating mechanism 111 and defines theinlet 22 b and theoutlet 22 a of theflushing device 20. - The
outer sleeve 23 is adapted to be releasably incorporated in the drill stem assembly and provides a plurality of flushingoutlets 33. The flushingoutlets 33 allow fluid to pass frompassage 32 to the annular space between the flushingdevice 20 and the bore wall (not shown) when theflushing device 20 is in an open condition, as represented inFIG. 6 . - Each flushing
outlet 33 comprises anannular chamber 35 located on the inner face of theouter sleeve 23, and a plurality ofnozzle assemblies 36 in communication with theannular chamber 35 and spaced around the perimeter of theflushing device 20. Each flushingoutlet 33 extends obliquely outwards and backwards. - As best shown in
FIG. 1 , theinner member 113 of the actuating mechanism 111 incorporates a portion called awash pipe 121. Thewash pipe 121 has a constant internal diameter whilst a portion of the outer diameter tapers inwardly from a first end to a second end, the first end being closer to theinlet 22 b of theflushing device 20. - The
inner member 113 has a second seal assembly 93 comprising a pair ofseals 96 located along an outer diameter and adjacent its second end. Theinner member 113 also incorporates a further set of seals 35 b comprising a pair of seals 95 adjacent theannular chamber 35. Theseals 96 of the second seal assembly 93 have a smaller cross section than the seals 95 of the set of seals 35 b. - The actuating mechanism 111 also comprises a
cavity 153 located between theinner member 113 and theouter member 115. Thecavity 153 defines athird region 122. - An
internal portion 165 of theouter member 115 provides asurface 167 against which the second seal assembly 93 of the inner member slidingly engages. - The pressure differential required between the
first region 119 and thethird region 122 in order for the actuating mechanism 111 to alternate between first and second conditions can be varied by changing the cross sectional diameter of theseals 96 in the second seal assembly 93. Changes in cross sectional diameter of theseals 96 are accommodated by changes in the diameter of theinternal portion 167 of theouter member 115, against which the second seal assembly 93 slidably engages varies according to - The
indexing mechanism 80 is best shown inFIGS. 10 , 11 and 12. Theindexing mechanism 80 comprises anindexing sleeve 29, rotatingtravel stop 62, and apositioning sleeve 129. - The
inner sleeve 29 provides apawl 68 projecting from an end thereof. Referring toFIG. 1 , theindexing sleeve 29 is rotationally fixed relative to theinner member 113 by akey way arrangement 131. Theindexing sleeve 29 also comprises a projection 29 a extending inwardly from a first end of theindexing sleeve 29, as best shown inFIG. 10 . The portion 29 a of theindexing sleeve 29 provides a face upon which first spring 67 acts to bias theindexing sleeve 29 towards ashoulder 171 on the internal surface of theouter member 115. - As shown in
FIG. 10 to 12 , thepositioning sleeve 129 comprises a plurality offingers 28 a and slots 28 b which are configured to provide a peak at their periphery. Thepositioning sleeve 129 is rotationally fixed relative to theinner member 113 by akey way arrangement 133, as shown inFIG. 1 . Theouter member 115 provides ashoulder 163 against which thepositioning sleeve 129 abuts. - As shown in
FIG. 10 to 12 , therotating travel stop 62 provides aratchet 69 comprising a plurality of indents 69 a which are adapted to receivepawl 68. In particular, each indent 69 a comprise a ramp 69 b which slidingly engagespawl 68.Travel stop 62 also provides a plurality of fingers 27 a and slots 27 b which are configured to provide a trough at their periphery. These troughs mate with corresponding peaks of thepositioning sleeve 129 when thetravel stop 62 engages therewith. - The operation of the
indexing mechanism 80 is best described with reference toFIG. 12 . Movement of theinner member 113 towards an inlet of theinternal passage 117 with respect to theouter member 115 will result in abottom face 70 of theindexing sleeve 29 abuttingshoulder 171 of theouter member 115, preventing further downward movement of theindexing sleeve 29. - Continued downward movement of the
inner member 113 will result in travel stop 62 moving towards indexingsleeve 29 causing the fingers 27 a to disengage from thefingers 28 a, as shown inFIG. 12 b. Thetravel stop 62 is biased towards theindexing sleeve 29 bysecond spring 127 acting between thetravel stop 62 and thepositioning sleeve 129, as shown inFIG. 1 . - Continued downward movement will result in the
ratchet 69 engaging thepawl 68 which is offset sufficiently from the plurality of indents 69 a so that the front region of the ramp 69 b of an indent 69 a sufficiently engages the top portion of thepawl 68 as best shown inFIG. 12 b. - Continued downward movement will result in travel stop 62 rotating as the ramp 69 b slides down the face of the
pawl 68. This will continue until the indent 69 a completely receives thepawl 68, as shown inFIG. 12 d. - Referring to
FIG. 1 , when theinner member 113 is caused to move upwardly as a result of the change in pressure differential acting across thewash pipe 121, abottom surface 137 of thetravel stop 62 is caused to abut ashoulder 139 located on the outer surface of thewash pipe 121. Continued movement of theinner member 113, in addition to the biasing force exerted byfirst spring 27 between theindexing sleeve 29 and thetravel stop 62, results in disengagement therebetween as the travel stop 62 moves towards thepositioning sleeve 129. - As indicated in
FIG. 12 e, the fingers 27 a do not entirely align withslots 28 a. However, due to the configuration of the peaks 82, continued upward movement of theinner member 113 results in the fingers 27 a sliding over thefingers 28 a causing further rotation of thetravel stop 62 until the fingers 27 a align withslots 28 a of thepositioning sleeve 129, such that the fingers are interlaced. Continued upward movement of theinner member 113 will result in the engagement of the fingers 27 a with the slots 28 b. When thefingers 27 a and 28 a are interlaced the actuating mechanism 111 is in its second condition, and theflushing device 20 is in its open operable condition, as shown inFIG. 1 . - A similar process will in turn cause the
rotating travel stop 62 to be indexed to a second position whereby the fingers 27 a align withfingers 28 a such that they are in an opposed relation. When thefingers 27 a and 28 a are opposed the actuating mechanism 11 is in its first position, and the axial movement of theinner member 113 is sufficient only for thepawl 68 to disengage theratchet 69. - The axial movement of the
rotating travel stop 62 is restricted to the movements of theinner member 113. Downward movement of the travel stop 62 relative toinner member 113 is prevented byshoulder 139. The biasing force exerted bysecond spring 127 prevents upward movement of the travel stop 62 relative to theinner member 113. The rotational movement of thetravel stop 62 is governed by theflushing device 20 and the travel stops 62 position with respect to indexingsleeve 29, andfingers 28 a and slots 28 b. - The operation of the
indexing mechanism 80 with respect to the operation of theflushing device 20 is further discussed below. - As best shown in
FIGS. 4 to 6 , the actuating mechanism 111 also comprises aretention mechanism 141 to releasably retain the actuating mechanism 111 in one condition until the predetermined pressure differential between thefirst region 119 andthird region 122 is reached, whereupon the actuating mechanism 111 is permitted to move from one condition to the other. - The
retention mechanism 141 is provided by a plurality of detents comprising aball 143 fixed axially relative to theinner member 113 but biased radially outwardly from the inner member bydetent spring 145. Theouter member 115 has afirst groove 147 and asecond groove 149 on the inner surface, each being spaced a distance from each other substantially equal in length to the axial distance theinner member 113 moves relative to theouter member 115 when the actuating mechanism 111 moves between its first and second conditions. - Each
groove ball 143 such that theball 143 is snugly received therein so as to hold theinner member 113 relative to theouter member 115. - In operation, when the actuating mechanism 111 is in its first condition the
ball 143 is received in thefirst groove 147, as shown inFIG. 1 . As the pressure difference between thefirst region 119 and third region increases to a predetermined value, theball 143 is forced inwardly by the action of the axial force on theinner member 113 caused by the pressure of the fluid flowing through the passage. When theball 143 is caused to disengage from thefirst groove 147, theinner member 113 moves rapidly to either an intermediate position between thefirst groove 147 andsecond groove 149, as shown inFIG. 2 , or until the actuating mechanism 111 is in its second condition, as shown inFIG. 3 , wherein theball 143 aligns and engages with thesecond groove 149, whereby the actuating mechanism 111 is held in its second condition. - When the actuating mechanism 111 is in its second condition, a drop in the pressure differential between the
first region 119 andthird region 122 to a predetermined value, will result in theball 143 moving inwardly due to the axial force acting on theinner member 113, and disengaging thesecond groove 149, allowing theinner member 113 to move rapidly with respect to theouter member 115, and the actuating mechanism 111 moves back to its first condition. - Upon disengagement of the
ball 143 from thefirst groove 147, the extent to which theinner member 113 moves with respect to theouter member 115 is dependant on the position of theindexing mechanism 80. If theindexing mechanism 80 is in its first position the fingers of the travel stop 62 are in opposed relation to the fingers on thepositioning sleeve 129. This restricts the axial movement of theinner member 113 with respect to theouter member 115 so that theinner member 113 is only able to move to an intermediate position between the first and second grooves as best shown inFIG. 2 . - If the
indexing mechanism 80 is in its second position the fingers of the travel stop 62 are interlaced with the fingers on thepositioning sleeve 129. This allows for greater axial movement of theinner member 113 with respect to theouter member 115 so that the actuating mechanism 111 is able to move to its second condition, as shown inFIG. 3 . - The actuating mechanism 111 incorporates a knuckle joint 151 capable of allowing pivotal movement of the
inner member 113 relative to its longitudinal axis. Theknuckle joint 151 allows the actuating mechanism 111 to operate effectively even when loads applied to theouter member 115 cause it to deflect between its ends. - Referring now to
FIGS. 1 to 3 , thecavity 153, defined between theinner member 113 and theouter member 115, filled with a lubricant such as oil. Thecavity 153, which is sealed to prevent the ingress of any contaminants, houses theindexing mechanism 80 and theretention mechanism 141, and ensures reliable conditions for the functioning of these components. - In use, the volume of the
cavity 153 changes as theinner member 113 moves relative to theouter member 115. To ensure the volume of the cavity is free to fluctuate according to movement of theinner member 113, the actuating mechanism 111 incorporates an equalising device 155. The equalising device comprises a floating sleeve 157 which is slidingly retained on anouter portion 159 of theouter member 115, and provides achamber 161 which is in fluid communication with thecavity 153 through anopening 154. As theinner member 113 moves, the volume of thecavity 153 changes accordingly. When the volume is reduced, the lubricant exits thecavity 153 throughopening 154 and into thechamber 161, causing the floating sleeve 157 to move accordingly to allow for the increase in volume in thechamber 161. Similarly, when the volume of thecavity 153 increases, lubricant is caused to move from thechamber 161 into thecavity 153, and the floating sleeve 157 is caused to move accordingly. Hence, the floating sleeve 157 moves relative to theopening 154 to accommodate volumetric changes within thecavity 153. - The floating sleeve 157 is in communication with the
second region 120. As a result the pressure in thesecond region 120 is transmitted to thechamber 161 and thecavity 153. Hence, the pressure, and volume, of thethird region 122 provided by thecavity 153, is representative of the pressure in thesecond region 120. As outer surfaces of thewash pipe 121 are exposed to thecavity 153, the pressure in thesecond region 120 affects the operation of the actuating mechanism 111. - The equalising device 155 balances and cushions the movement between the inner and outer members.
- The
outer member 115 also provides aport 37 which is in communication with thecavity 153 allowing it to be filled with lubricant if so required. - The equalising device 155 is provided with seals to seal the interface between the floating sleeve 157 and the
outer member 115. - The
flushing device 20 also comprises anintermediate sleeve 42 located between theinner sleeve 21 and theouter sleeve 23. - Referring to
FIGS. 4 to 6 theintermediate sleeve 42 comprises a outwardly extending shoulder 46 at its first end, and terminates at its other end with a sloping face 42 a. The sloping face 42 a mates with upwardly sloping face 42 b located on theinner sleeve 21 to provide a seat. - The
intermediate sleeve 42 also contains a plurality ofholes 43 which receives a plurality ofballs 44. Eachball 44 has a diameter greater than the radial thickness of theintermediate sleeve 42 such that when theintermediate sleeve 42 is at its lower most position eachball 44 protrudes beyond the interface between the intermediate sleeve and theinner sleeve 21 and rests against the downwardly slopingface 45 of theinner sleeve 21. The mating of seat portion 42 a of theintermediate sleeve 42 with the upwardly sloping face 42 b of theinner sleeve 21 is at a predetermined distance from the plurality ofholes 43 such that theballs 44 are not permitted to enteraperture 38. - The
intermediate sleeve 42 is rotationally fixed to theouter sleeve 23 bykey way arrangement 142. This arrangement assists in ensuring the interface between theintermediate sleeve 42 andouter sleeve 23 does not become clogged with fluid (slurry) passing through theflushing device 20. - In operation, movement of the
inner sleeve 21 in an upward direction causes the downwardly slopingface 45 to abut against theball 44, as shown inFIG. 7 , causing theintermediate sleeve 42 to move upwardly with theinner sleeve 21. Continued upward movement will be restricted by theintermediate sleeve 42 abutting againstprojection 47. This abutment occurs as theball 44 aligns withannular groove 48 allowingball 44 to be received therein, as shown inFIG. 6 . - This enables the
inner sleeve 21 to continue to move upwardly whilstintermediate sleeve 42 remains locked in position. Continued upward movement ofinner sleeve 21 will result in the plurality ofapertures 38 being open to theflushing outlet 33, as shown inFIG. 6 . - The operation of the
intermediate sleeve 42 ensures theapertures 38 remain closed until theaperture 38 begins to align withannular chamber 35 of theflushing outlet 33. When a gap is introduced between the sloping face 42 b and conical face 42 a, the passage which allows the fluid to pass from thepassage 32, through theslots 38 and through the flushingoutlet 33 opens. - The
annular chamber 35 has a set of seals 35 a, 35 b adjacent each side thereof. These seals render the interface between theinner sleeve 21 andouter sleeve 23 fluid tight, preventing slurry passing from thepassage 32 and into the interface and thecavity 153 when theflushing device 20 is in an open operable condition. When the flushing device is in a closed operable condition a first section 49 a of theinner sleeve 21 co-acts with seals 35 a to provide a seal. As theinner member 113 moves upwardly relative to theouter member 115, theintermediate sleeve 42 moves upwardly to co-act with the seals 35 a and provide a seal below theannular chamber 35, preventing fluid passing through theapertures 38 and ingressing between theinner sleeve 21 andouter sleeve 23. - When the
flushing device 20 moves to a closed operable position as shown inFIGS. 4 and 5 , theinner member 113 moves downwardly relative to theouter member 115, providing a barrier between theinner passage 32 and theannular chamber 35 of theflushing outlet 33. Continued movement of theinner member 113 will result in the sloping face 42 b abutting mating conical face 42 a of theintermediate sleeve 42 whilst simultaneously the downwardly facingslope 45passes groove 48. The plurality ofballs 44 will then be forced to move in an inward direction resulting in the intermediate sleeve engaging theinner sleeve 21 to move downwardly with further downward movement of theinner sleeve 21. - Sloping face 42 b and conical face 42 a remain in intimate contact until they have passed seals 35 a.
- The operation of the
flushing device 20 between an open operable condition and a closed operable condition, and vice versa, is extremely simple and reliable, and allows theflushing device 20 to remain in the required condition by maintaining a predetermined pressure differential between thefirst region 119 andthird region 122. - Referring to
FIGS. 1 to 6 , thepassage 32 through which fluid passes is partly defined by the inner wall of theinner sleeve 21. This inner Wall substantially provides a barrier, preventing the ingress of slurry in to the cavities between theinner sleeve 21 andouter sleeve 23. Whereapertures 38 are provided, seals are provided to prevent leakage of the slurry. - In the closed operable condition the
indexing mechanism 80 is arranged such that the fingers 27 a are in opposed relation withfingers 28 a, as shown inFIGS. 2 , 5, 8 and 12 a. In this mode theflushing outlet 33 is closed. - In order for the
flushing device 20 to move from the closed operable condition, shown inFIG. 2 , to the open condition, shown inFIG. 3 , the surface pumps are momentarily switched off such that no slurry is passing through theflushing device 20. This results in a change in pressure differential between thefirst region 119 andthird region 122, causing theinner member 113, and hence theinner sleeve 21, to move relative to theouter sleeve 23 in a direction towards theinlet 22 b. - As a result of this movement the
travel stop 62 is free to move in the same axial direction, being biased to do so as thesecond spring 127 forces the travel stop 62 to disengage from thepositioning sleeve 129. - Continued movement of the
inner member 113 results in compression of first spring 67 as the travel stop 62 moves towards theindexing sleeve 29, which is prevented from downward movement byshoulder 171 against which it abuts. As previously discussed thetravel stop 62 engages thepawl 68 on theindexing sleeve 29. Further movement ofinner sleeve 21 towardsinlet 22 b results in the ramp 69 b of the indent 69 a to slidingly abut thepawl 68, causing the travel stop 62 to rotate until the indent 69 a fits over pawl 68 (FIG. 12 d). At this point thetravel stop 62 has rotated so that the fingers 27 a are nearly aligned with corresponding slots 28 b of the end portion 85. - At this point the
ball 143 aligns withfirst groove 147, and due todetent spring 145, engages thefirst groove 147 to hold theinner member 113 axially fixed relative to theouter member 115, as shown inFIG. 4 . - The pumps are then started and the pressure in the
first region 119 increases. When the pressure differential between thefirst region 119 andthird region 122 is large enough to overcome the force of theball 145 acting in thefirst groove 147, theball 147 disengages thefirst groove 147 and theinner member 113 is caused to move rapidly with respect to theouter member 115. - This causes
shoulder 139 to move the travel stop 62 away from the indexing sleeve 29 (FIG. 12 e). As the force acting on theinner member 113 due to the pressure differential is greater than the force of thesecond spring 127, theinner member 113 moves towards thepositioning sleeve 129. As the travel stop 62approaches positioning sleeve 129, the end offingers 27 contact the end offingers 28 a. Owing to the peak configuration 82 offingers 28 a thetravel stop 62 is caused to further rotate such that the fingers 27 a now align with slots 28 b (FIG. 12 f). - Continued movement of the
inner member 113 towards theoutlet 22 a will result in the end of fingers 27 a abutting the bottom surface of theslots 28 a such that thefingers 27 a and 28 a are in an interlaced configuration. - At this point the
ball 143 of theretention mechanism 141 is aligned with thesecond groove 149, whereupon theball 143 engages thesecond groove 149 holding theinner member 113 relative to theouter member 115, as shown inFIG. 2 . - As the fingers 27 a and 28 b become interlaced the upward movement of the
inner member 113 has caused theinner sleeve 21 to disengageintermediate sleeve 42 and allow theapertures 38 to align with flushingoutlets 33. This condition is depicted inFIGS. 3 and 6 . - The
retention mechanism 141 prevents the closure of theflushing outlet 33 until the force exerted byspring 127 is able to overcome both the force of theretention mechanism 141 holding theinner member 113 relative to theouter member 115, and the pressure differential between thefirst region 119 and thethird region 122. - When the
flushing device 20 is in an open condition, a percentage of fluid is diverted frompassage 32 through flushingoutlet 33, exiting from theflushing device 20 into the annular space betweenflushing device 20 and the wall of the bore. The percentage of fluid diverted is largely dependant on the size of the orifice ofnozzle assembly 36, and may be adjusted accordingly. The diverted fluid is used to assist in cleaning the bore of cuttings. - To close the flushing
outlet 33 and cause theflushing device 20 to move to a closed condition, the pressure differential between thefirst region 119 andthird region 122 is reduced so that the force ofspring 127 is greater than the force exerted by theretention mechanism 141, at which point theball 143 disengages thesecond groove 149, allowing theinner member 113 to rapidly move with respect to theouter member 115 towards theinlet 22 b. Simultaneously thetravel stop 62 disengages from thepositioning sleeve 129 and moves towards theindexing sleeve 29, ready to cycle to a new position. - Continued downward movement will result in the
indexing sleeve 29 abutting theshoulder 171 and theball 143 of theretention mechanism 141 will once again aligning with and engagingfirst groove 147. Simultaneously, theratchet 69 on thetravel stop 62 engagespawl 68 causing the travel stop 62 to rotate. Upon an increase in pressure differential sufficient to overcome the force exerted by theretention mechanism 141, theinner member 113 is again caused to move relative to theouter member 115 towards theoutlet 22 a. As the travel stop has indexed to a new position, the troughs 81 of fingers 27 a engage the peaks 82 offingers 28 a of thepositioning sleeve 129 so that the fingers are in opposed configuration, as best shown inFIG. 12 a. In this position theinner member 113 is prevented from full axial movement relative to theouter member 115 due tofingers 28 a and 27 a being in opposed relation. Theflushing device 20 is in a closed operable condition, as shown inFIG. 2 . - During the indexing process, the downward movement of
inner member 113 has resulted in theinner sleeve 21 re-engagingintermediate sleeve 42, and blocking the path between theinner passage 32, closing the flushingoutlets 33. - The switching between the two conditions of the
flushing device 20 may be controlled remotely by the operator on the surface. The operator will know to activate and deactivate theflushing device 20 according to the behaviour of the drilling stem assembly, the drilling head, and the slurry which is being returned to the surface. - The operational condition of the
flushing device 20 can only be changed by deliberate actions on the part of the operator. - The
flushing device 20 may be placed anywhere along the drilling stem assembly, its position depending on the application. Indeed the drilling of a well may require the inclusion of one ormore flushing devices 20 to be used to maintain the required conditions in the bore. - Where required the surface of the components are coated with a hard, wear resistant coating and ground to a fine finish in order to prevent scouring of the surface by the action of the drilling fluid. This also assists in prolonging the life of the seals.
- The required pressure differential between the
first region 119 andthird region 122 can be varied by varying the force exerted bydetent spring 145 onball 143. - The
retaining mechanism 141 provides a retaining force equal to or slightly greater than the load differential of thespring 127 as it is compressed from its original length (flushing device 20 in its closed operable condition) to its compressed length (flushing device 20 in its open operable condition). Hence the wash pipe 121 (and thereforeinner member 113 and inner sleeve 23) will not move until the pressure differential is sufficient to fully compressspring 127. At this point theball 143 is forced to retract and thewash pipe 121 will snap to the fully open condition (when fingers ofindexing mechanism 80 are interlaced), where theball 143 will engage thesecond groove 149, such that theflushing device 20 is in its open operable condition. - Upon falling pressure, the
retention mechanism 141 holds theflushing device 20 open until the pressure differential falls below the force generated by thespring 127, at which point theball 143 will retract from thesecond groove 149 and thewash pipe 121 will snap back, moving theflushing device 20 to its closed operable condition. - The
retention mechanism 141 also prevents partial opening and closing of the actuating mechanism 111. At the point were the pressure differential is sufficient to move the actuating mechanism 111 to its next condition, theball 143 retracts from the appropriate groove (depending upon position) and the actuating mechanism snaps into its next condition—there being no gradual movement between the first and second conditions of the actuating mechanism 111. - Furthermore the pressure differential required to operate the actuating mechanism may be varied by varying the diameter of the
seals 96 of the second seal assembly 93, as previously discussed. This does not however affect the ratio between opening and closing pressures. - In another embodiment of the invention, the
flushing device 20 does not include theintermediate sleeve 42. In such an embodiment theinner sleeve 21 is configured to ensure a fluid tight seal exists between the inner sleeve and the outer sleeve. - Whilst only one application of the invention has been described it is to be appreciated that the invention can be used in relation to many other applications. For instance, it may be used in operating or actuating a ball valve or any type of valve, an under reamer or casing cutter, it can be easily converted to a single shot operation for a permanent installation, and it may be used for deep mineral air drilling.
- Modifications and variations such as would be apparent to the skilled addressee are considered to fall within the scope of the present invention.
- Throughout the specification, unless the context requires otherwise, the word “comprise” or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.
Claims (58)
1-84. (canceled)
85. An actuating mechanism comprising:
an inner member and an outer member axially slidable relative to each other, the inner and outer members cooperating to define an internal passage for the flow of a fluid therethrough;
the inner member being configured such that upon a predetermined change in pressure between a first region and a second region the actuating mechanism is caused to move between a first condition and a second condition.
86. The actuating mechanism according to claim 85 wherein the first region is in the internal passage of the actuating mechanism.
87. The actuating mechanism according to claim 85 wherein the second region is external of the actuating mechanism.
88. The actuating mechanism according to claim 85 wherein the pressure in the second region is transmitted to a third region located within the actuating mechanism, such that a change in pressure in the second region affects the pressure in the third region.
89. The actuating mechanism according to claim 88 wherein the third region is located substantially between the inner and outer members.
90. The actuating mechanism according to claim 88 wherein at least a section of the inner member is exposed to both the first and third regions.
91. The actuating mechanism according to claim 88 wherein an inner surface of the inner member is exposed to the first region and an outer surface of the inner member is exposed to the third region.
92. The actuating mechanism according to claim 88 wherein the actuating mechanism is caused to move between its first and second conditions when the pressure difference between the first region and third region reaches a predetermined value, due to the unequal forces being exerted across the inner member.
93. The actuating mechanism according to claim 85 wherein the inner member and outer members are in the form of pipes.
94. The actuating mechanism according to claim 85 wherein the inner member comprises a wash pipe having a first end with an outer diameter larger than an outer diameter at a second end, the wash pipe has a portion having a tapered outer diameter.
95. The actuating mechanism according to claim 94 wherein the wash pipe has a first seal assembly located along the outer diameter adjacent the first end and a second seal assembly located along the outer diameter adjacent the second end.
96. The actuating mechanism according to claim 95 whereby varying the cross sectional diameter of an at leak one seal of the second seal assembly varies pressure differential required between the first region and the second region to operate the actuating mechanism.
97. The actuating mechanism according to claim 95 whereby an internal portion of the outer member against which the second seal assembly slidingly engages can be varied according to changes in cross sectional diameter of the at least one seal in the second seal assembly.
98. The actuating mechanism according to claim 85 wherein a cavity is defined between the inner member and outer member, the cavity being filled with a lubricant such as oil.
99. The actuating mechanism according to claim 98 wherein the cavity has an opening which opens into a chamber of an equalising device.
100. The actuating mechanism according to claim 99 wherein the equalising device is in the form of a floating sleeve which is slidingly retained on an outer portion of the outer member and which surrounds the chamber, whereby volumetric changes in the cavity result in the floating sleeve moving with respect to the opening.
101. The actuating mechanism according to claim 100 wherein the floating sleeve is in communication with the second region such that pressure in the second region is transmitted to the cavity.
102. The actuating mechanism according to claim 96 wherein the cavity provides the third region.
103. The actuating mechanism according to claim 96 wherein the cavity is sealed from the internal passage such that the cavity may not be contaminated.
104. The actuating mechanism according to claim 85 wherein the actuating mechanism comprises an indexing mechanism which indexes between a first position, wherein the actuating mechanism is in the first condition and a second position wherein the actuating mechanism is in the second condition.
105. The actuating mechanism according to claim 104 wherein the indexing mechanism is located between the first and second members.
106. The actuating mechanism according to claim 104 wherein the indexing mechanism operates within the cavity.
107. The actuating mechanism according to claim 104 wherein the indexing mechanism comprises an indexing sleeve, a travel stop and a positioning sleeve.
108. The actuating mechanism according to claim 107 wherein the indexing sleeve is fixed rotationally to the inner member.
109. The actuating mechanism according to claim 107 wherein the indexing sleeve is axially movable relative to the inner member.
110. The actuating mechanism according to claim 107 wherein the travel stop is mounted on the inner member such that it may rotate about the longitudinal axis thereof, and wherein the travel stop is substantially constrained against axial movement relative to the inner member.
111. The actuating mechanism according to claim 107 wherein the positioning sleeve is fixed rotationally to the inner member.
112. The actuating mechanism according to claim 107 wherein the positioning sleeve is axially movable relative to the inner member.
113. The actuating mechanism according to claim 107 wherein the indexing sleeve and travel stop are biased away from each other.
114. The actuating mechanism according to claim 107 wherein the travel stop and positioning sleeve are biased away from each other.
115. The actuating mechanism according to claim 107 wherein the travel stop is adapted to co-operate with the indexing sleeve during the indexing sequence.
116. The actuating mechanism according to claim 107 wherein the indexing sleeve has a first end which provides a bottom face and a second end having a projection, defining a pawl, extending in an axial direction from the periphery of the second end.
117. The actuating mechanism according to claim 116 wherein the travel stop has a first end adapted to engage and mesh with the projection on the indexing sleeve and a second end adapted to engage and mesh with the positioning sleeve.
118. The actuating mechanism according to claim 117 wherein a first end of the positioning sleeve is shaped to engage and mesh with the second end of the travel stop.
119. The actuating mechanism according to claim 117 wherein the second end of the travel stop is configured to provide a plurality of fingers and corresponding slots, which co-act with corresponding fingers and slots integral with the positioning sleeve, wherein each finger and slot of the travel stop terminates in at least one depression or trough, whilst each finger and slot of the positioning sleeve terminates in at least one peak complimentary in shape to the depression/trough so that upon engagement each finger on the travel top aligns with a finger and/or slot on the positioning sleeve depending on whether the indexing mechanism is in its first position or second position.
120. The actuating mechanism according to claim 119 whereby when the indexing mechanism is in its first position the fingers on the travel stop align and mate with the fingers on the positioning sleeve, such that the fingers are opposed and when the indexing mechanism is in its second position the slots on the travel stop align and mate with the fingers on the positioning sleeve, whilst the fingers on the travel stop align and mate with the slots on the positioning sleeve, such that the fingers are interlaced.
121. The actuating mechanism according to claim 119 wherein the number of peaks/troughs on each finger/slot determines whether the actuating mechanisms cycles between the first condition and second condition.
122. The actuating mechanism according to claim 85 wherein the actuating mechanism comprises at least one retention mechanism to releasably retain the actuating mechanism in one condition until the predetermined pressure differential between the first and third regions is reached whereupon the actuating mechanism is able to move from one condition to the other.
123. The actuating mechanism according to claim 122 wherein the retention mechanism is a detent, comprising a ball fixed relative to the inner member but biased radially outward from the inner member.
124. The actuating mechanism according to claim 85 wherein the outer member may have a first groove and a second groove on its inner surface spaced a distance from each other, whereby the distance there between is substantially equal in length to the axial distance the inner member moves relative to the outer member as the actuating mechanism moves between its first and second conditions.
125. The actuating mechanism according to claim 124 wherein each groove is annular with a cross section complimentary to the ball so that the ball can be received therein and hold the inner member relative to the outer member.
126. The actuating mechanism according to claim 122 wherein the retention mechanism comprises a ball fixed relative to the outer member and biased radially inward from the outer member, the inner member having a first groove and a second groove on its outer surface spaced a distance from each other substantially equal in length to the axial distance the inner member moves relative to the outer member as the actuating mechanism moves between its first and second conditions.
127. The actuating mechanism according to claim 85 wherein the actuating mechanism is incorporated in an apparatus, such as a tool, for actuating the apparatus between first and second operational condition.
128. The actuating mechanism according to claim 127 wherein the apparatus is a flushing device, whereby the actuating mechanism causes the flushing device to move between the first operable condition, wherein the flushing device is closed and the second operable condition wherein the flushing device is open.
129. The actuating mechanism according to claim 128 wherein an inner sleeve of the flushing device comprises the inner member of the actuating mechanism, an outer sleeve of the flushing device comprises the outer member of the actuating mechanism, and an internal passage of the flushing device incorporates the internal passage of the actuating mechanism.
130. The actuating mechanism according to claim 129 wherein the outer sleeve incorporate openings, the openings being blocked from the internal passage when the flushing device is in the closed operable condition, and register with the internal passage when the flushing device is in the open operable condition.
131. The actuating mechanism according to claim 128 wherein the flushing device is configured such that the flushing device remains in the selected open or dosed operable condition regardless of any expansive or compressive force.
132. The actuating mechanism according to claim 130 wherein the openings provide a flushing outlet, whereby when the flushing device is in an open operable condition a predetermined percentage of the fluid is diverted from the passage to the outside of the flushing device.
133. The actuating mechanism according to claim 132 wherein the flushing outlet comprises a plurality of apertures in the inner sleeve, an annular chamber in the outer sleeve and a plurality of nozzles.
134. The actuating mechanism according to claim 129 wherein a fluid tight seal is provided between the inner and outer sleeve when the flushing device moves from a closed operable condition to an open operable condition.
135. The actuating mechanism according to claim 134 wherein the flushing device comprises an intermediate sleeve located between the inner and outer sleeve between the flushing outlet and the inlet of the flushing device, the intermediate sleeve being adapted to provide the fluid tight seal.
136. The actuating mechanism according to claim 127 wherein the apparatus is an under reamer or casing cutter whereby the actuating mechanism causes the under reamer or casing cutter to move between a first operable condition, wherein a cutting device is contained within the under reamer or casing cutter, and a second operable condition wherein the cutting device protrudes from the under reamer or casing cutter to cut as required.
137. The actuating mechanism according to claim 127 wherein the apparatus is an under reamer or casing cutter whereby the actuating mechanism causes the cutting device to move between a first operable condition, wherein the cutting device is off, and a second operable condition wherein the cutting device is on.
138. The actuating mechanism according to claim 127 wherein the apparatus is an under reamer or casing cutter whereby the apparatus is a valve, such as a ball valve, whereby the actuating mechanism causes the valve to move between a first operable condition, wherein the valve is closed and a second operable condition wherein the valve is open.
139. A flushing device comprising
an inner sleeve and an outer sleeve, moveable relative to each other between an open operable condition, wherein a percentage of the fluid passing through a central passage of the flushing device can be diverted through a plurality of flushing outlets, and a closed operable condition, wherein the fluid outlets are blocked from the passage,
an actuating mechanism operable between the inner and outer sleeves, and having first and second conditions which correspond to the open and closed operable conditions, the actuating mechanism being responsive to a fluid pressure differential between a cavity defined between the inner and outer sleeves, and the pressure in the internal passage, for movement between its first and second conditions, whereby the actuating mechanism, when in the first or second condition couples the inner sleeve to the outer sleeve to prevent movement of the inner sleeve relative to the outer sleeve until predetermined value of pressure differential is reached.
140. A flushing device for flushing diverted fluid upwards into an annular space between a drill stem and a hole, where a slurry passes through a central passage of the flushing device to a drill head, whereupon it reverses direction, passing through the annular space before returning to the surface with cuttings from the drilling process suspended in the return slurry, the flushing device is adapted to change between an open operable condition, whereby a predetermined percentage of fluid is diverted from the passage to the annular space to assist in maintaining a clean bore, and a closed operable condition, whereby the full flow of the slurry is delivered to the drill head, and is configured such that the increase or reduction of pressure in the internal passage relative to the pressure external the flushing device causes an actuating mechanism located in the device to cycle between a first and second condition whereby the flushing device correspondingly cycles through open and closed operable conditions.
141. A flushing device comprising:
an inner sleeve, slidingly received in an outer sleeve, the inner and outer sleeves cooperating to define an internal passage for the flow of a fluid, and are permanently coupled such that there is no rotational movement between the two sleeves;
the outer sleeve having a plurality of flushing outlets
an actuating mechanism comprising an inner and outer member, incorporated within the inner and outer sleeves, an internal passage which is common with the internal passage of the flushing device, the actuating mechanism being caused to cycle between open and closed conditions with change in the pressure differential acting upon the inner member;
an indexing mechanism which indexes as a result of the operation of the actuating mechanism, the indexing mechanism indexes between first and second positions such that the flushing device moves between an open operable condition, whereby the plurality of flushing outlets are open for discharging a quantity of the fluid from the internal passage, and a closed operable condition, whereby the plurality of flushing outlets are closed, the operable condition depending on the position of the indexing mechanism.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003906111 | 2003-11-05 | ||
AU2003906111A AU2003906111A0 (en) | 2003-11-05 | Actuating Mechanism | |
PCT/AU2004/001512 WO2005045180A1 (en) | 2003-11-05 | 2004-11-01 | Actuating mechanism |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090126936A1 true US20090126936A1 (en) | 2009-05-21 |
Family
ID=34558177
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/666,674 Abandoned US20090126936A1 (en) | 2003-11-05 | 2004-11-01 | Actuating mechanism |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090126936A1 (en) |
EP (1) | EP1815104A4 (en) |
AU (1) | AU2004287892A1 (en) |
NO (1) | NO20072534L (en) |
WO (1) | WO2005045180A1 (en) |
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US20100212966A1 (en) * | 2009-02-24 | 2010-08-26 | Hall David R | Downhole Tool Actuation |
US20100212885A1 (en) * | 2009-02-24 | 2010-08-26 | Hall David R | Downhole Tool Actuation having a Seat with a Fluid By-Pass |
US20110048739A1 (en) * | 2009-08-27 | 2011-03-03 | Baker Hughes Incorporated | Methods and apparatus for manipulating and driving casing |
US8267196B2 (en) | 2005-11-21 | 2012-09-18 | Schlumberger Technology Corporation | Flow guide actuation |
US8281882B2 (en) | 2005-11-21 | 2012-10-09 | Schlumberger Technology Corporation | Jack element for a drill bit |
US8360174B2 (en) | 2006-03-23 | 2013-01-29 | Schlumberger Technology Corporation | Lead the bit rotary steerable tool |
US8522897B2 (en) | 2005-11-21 | 2013-09-03 | Schlumberger Technology Corporation | Lead the bit rotary steerable tool |
US8869916B2 (en) | 2010-09-09 | 2014-10-28 | National Oilwell Varco, L.P. | Rotary steerable push-the-bit drilling apparatus with self-cleaning fluid filter |
WO2014133487A3 (en) * | 2013-02-26 | 2014-12-11 | Halliburton Energy Services, Inc. | Remote hydraulic control of downhole tools |
US8919452B2 (en) | 2010-11-08 | 2014-12-30 | Baker Hughes Incorporated | Casing spears and related systems and methods |
US9016400B2 (en) | 2010-09-09 | 2015-04-28 | National Oilwell Varco, L.P. | Downhole rotary drilling apparatus with formation-interfacing members and control system |
WO2016164304A1 (en) * | 2015-04-08 | 2016-10-13 | Superior Energy Services, Llc | Multi-pressure toe valve |
US9695659B2 (en) | 2013-11-11 | 2017-07-04 | Halliburton Energy Services, Inc | Pipe swell powered tool |
US10030475B2 (en) | 2013-02-14 | 2018-07-24 | Halliburton Energy Services, Inc. | Stacked piston safety valve with different piston diameters |
US10400534B2 (en) * | 2015-05-28 | 2019-09-03 | Halliburton Energy Services, Inc. | Viscous damping systems for hydrostatically set downhole tools |
US10450853B2 (en) * | 2014-10-23 | 2019-10-22 | Reflex Instruments Asia Pacific Pty Ltd | Down hole surveying |
CN111119791A (en) * | 2019-12-20 | 2020-05-08 | 中海石油(中国)有限公司 | Dual-channel drilling underground floating valve |
US10844677B2 (en) | 2016-09-07 | 2020-11-24 | Ardyne Holdings Limited | Downhole cutting tool and method of use |
WO2021225754A1 (en) * | 2020-05-04 | 2021-11-11 | Baker Hughes Oilfield Operations Llc | Indexing valve system for a resource exploration and recovery system |
US20230374875A1 (en) * | 2020-10-14 | 2023-11-23 | Bruce McGarian | A selectively activatable downhole tool |
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EP2122119B1 (en) | 2007-02-13 | 2019-09-04 | BJ Services Company | Tool and method for establishing hydraulic communication with a subsurface safety valve |
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WO2014133487A3 (en) * | 2013-02-26 | 2014-12-11 | Halliburton Energy Services, Inc. | Remote hydraulic control of downhole tools |
US9695659B2 (en) | 2013-11-11 | 2017-07-04 | Halliburton Energy Services, Inc | Pipe swell powered tool |
US10450853B2 (en) * | 2014-10-23 | 2019-10-22 | Reflex Instruments Asia Pacific Pty Ltd | Down hole surveying |
US9752412B2 (en) | 2015-04-08 | 2017-09-05 | Superior Energy Services, Llc | Multi-pressure toe valve |
WO2016164304A1 (en) * | 2015-04-08 | 2016-10-13 | Superior Energy Services, Llc | Multi-pressure toe valve |
US10400534B2 (en) * | 2015-05-28 | 2019-09-03 | Halliburton Energy Services, Inc. | Viscous damping systems for hydrostatically set downhole tools |
US10900308B2 (en) | 2015-05-28 | 2021-01-26 | Halliburton Energy Services, Inc. | Viscous damping systems for hydrostatically set downhole tools |
US10844677B2 (en) | 2016-09-07 | 2020-11-24 | Ardyne Holdings Limited | Downhole cutting tool and method of use |
CN111119791A (en) * | 2019-12-20 | 2020-05-08 | 中海石油(中国)有限公司 | Dual-channel drilling underground floating valve |
WO2021225754A1 (en) * | 2020-05-04 | 2021-11-11 | Baker Hughes Oilfield Operations Llc | Indexing valve system for a resource exploration and recovery system |
US11566516B2 (en) | 2020-05-04 | 2023-01-31 | Baker Hughes Oilfield Operations Llc | Indexing valve system for a resource exploration and recovery system |
US20230374875A1 (en) * | 2020-10-14 | 2023-11-23 | Bruce McGarian | A selectively activatable downhole tool |
US12084931B2 (en) * | 2020-10-14 | 2024-09-10 | Odfjell Technology Invest Ltd | Selectively activatable downhole tool |
Also Published As
Publication number | Publication date |
---|---|
EP1815104A1 (en) | 2007-08-08 |
AU2004287892A1 (en) | 2005-05-19 |
NO20072534L (en) | 2007-08-01 |
EP1815104A4 (en) | 2010-05-05 |
WO2005045180A1 (en) | 2005-05-19 |
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Legal Events
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Owner name: DRILLING SOLUTIONS PTY LTD., AUSTRALIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BEGLEY, MAXWELL GRAHAM;MUNSLOW-DAVIES, KEITH;REEL/FRAME:022164/0122 Effective date: 20090105 |
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STCB | Information on status: application discontinuation |
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