CN1263937C - Reverse circulation drilling system with bit locked underreamer arms - Google Patents
Reverse circulation drilling system with bit locked underreamer arms Download PDFInfo
- Publication number
- CN1263937C CN1263937C CNB988092085A CN98809208A CN1263937C CN 1263937 C CN1263937 C CN 1263937C CN B988092085 A CNB988092085 A CN B988092085A CN 98809208 A CN98809208 A CN 98809208A CN 1263937 C CN1263937 C CN 1263937C
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- China
- Prior art keywords
- drill bit
- arms
- propeller
- underream
- starter
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 238000005553 drilling Methods 0.000 title claims abstract description 35
- 239000007858 starting material Substances 0.000 claims description 38
- 230000007246 mechanism Effects 0.000 claims description 28
- 239000012530 fluid Substances 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 abstract 3
- 238000005520 cutting process Methods 0.000 description 16
- 239000012634 fragment Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
- E21B10/66—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe the cutting element movable through the drilling pipe and laterally shiftable
Abstract
An underreamer drill bit assembly including a pilot bit (82) and extendable underreaming arms (88) operatively connected to the pilot bit (82). The underreaming arms (88) have an extended position for underreaming, and a retracted position in which the overall diameter of the underreamer drill bit assembly is less than the inside diameter of the well casing, permitting the entire bit assembly to be withdrawn through the well casing. In another aspect of the invention, the bit assembly is operatively connected to a dual wall pipe assembly (12). A supply of compressed air is conducted through the annulus (24) of the dual wall pipe assembly (12) to a down hole pneumatic hammer (13). Exhaust air from the down hole hammer (13) is directed to the bit assembly for continuous removal of drilling debris through a central evacuation tube (43) of the dual wall pipe assembly.
Description
Technical field
The present invention relates to a kind of strata drilling equipment, particularly relate to a kind of down-hole pneumatic striking mechanism well system.As pointed in the applicant's common unsettled related application 08/674123 (applying date is on July 1st, 1996) and 08/790066 (applying date is on August 27th, 1997), the underream device is used for forming radial flared region on every side at starter (pilot bit), so that insert a sleeve pipe.The application is the part continuation application of above-mentioned two applications.
Background technology
The eccentric underream device of installing (underreamer) is a known technology.This eccentric underream device of installing comprises an arms, and carrying out the operation of underream, and in order to take out drilling tool, this arms can bounce back towards borehole axis described arms along the certain track operation.Yet if the underream device runs into rock fragment, the metal object that buries or the like, the eccentric underream device of installing may depart from borehole axis.In most of drill-well operations (particularly when needs form the well of a plurality of dense distribution), any skew of a big drill bit all is to make us unacceptable.Any departing from all will hinder sleeve pipe greatly an installation of drilling well intraocular.
The known underream equipment of other uses the panel-like member that three drill bits have been installed, and these panel-like members can outwards move, but the whole working surface of this panel-like member is basically less than the periphery of well.A undersized panel-like member like this will be subjected to serious wearing and tearing and make drilling speed slow.
The underream operation also can realize by utilizing crown crown drill or ring bit, but the parts of these drill bits must be stayed the underream zone after drilling well is finished, this wastes very much, therefore can't make us accepting in some drill-well operation.
The applicant's common unsettled U.S. Patent application 08/674123 and the disclosed and claimed underream device of the present invention have solved each above-mentioned problem.
Except the problems referred to above relevant, also be a problem from well and drill bit removing drilling cuttings fast and effectively with known underream device.In the applicant's United States Patent (USP) 5511628 (being hereby incorporated by), a kind of pneumatic down-hole rig with central exhaust outlet is disclosed.Equipment in the United States Patent (USP) 5511628 allows big drilling cuttings fragment by discharging continuously to eyelet and by being connected to the central delivery pipe of this axis of centres on eyelet at an axis of centres that forms on the drill bit.Compressed air passes peripheral channel and arrives downwards and enter described central delivery pipe then below the drill bit.Compressed air passes mobile realization of central delivery pipe and removes the stratum fragment continuously and effectively from well, and it comprises the big fragment that quick removing can't be removed by the peripheral channel of sleeve pipe.
Yet, still need to provide a kind of recycled back pneumatic drilling machine, this rig can be realized: the underream of well, creeping into work plane continuous blow-down drilling cuttings fragment and be used for taking out drill bit by sleeve pipe after the process of drill-well operation or drill-well operation are finished in well.
Summary of the invention
The present invention is directed to shortcoming of the prior art and realize with a recycled back well system.
One object of the present invention just provides a kind of drill bit device on the pneumatic striking mechanism under the well that is used for, and this drill bit device comprises: compressed fluid source; A propeller; Pneumatic striking mechanism under the well, it is connected with described propeller, and can be operable in response to the supply of accepting compressed fluid and impact propeller; At least one and the fluid passage that pneumatic striking mechanism under described compressed fluid source and the well is communicated with, described passage comprises elongated annular space, this annular space to small part is formed by the concentric walls that connects the pipe of pneumatic striking mechanism under Compressed Gas supply and the well; A starter, this starter have an axle, a peripheral drilling well work plane, a soffit and a through hole that is upward through described axle extension from described soffit; Linkage, this linkage rotatably are connected to described propeller on the described starter; Underream device arms, this arms is rotatably installed in the centre of described propeller and described starter, and this arms comprises the underream surface, and this underream surface can navigate to the outside of the periphery of described starter; Cam face, described cam face can with the corresponding surface engagement on the underream device arms, to be used for: underream device arms is deployed into an extended position, and this underream device arms is locked in described extended position, and by rotatablely moving and described underream device arms bounced back from described extended position between described propeller and the described starter; And the surface, form at least one air duct between the through hole of this surface in a described angle of rake external surface and described starter.
According to another aspect of the present invention, the compressed air that provides a kind of continuous utilization the to emit method of washing drill bit from the down-hole jump bit.Discharged air stream passes the opening on the drill bit device according to the route of setting and enters in the central delivery pipe.Can also provide one second compressed air stream so that wash the perimeter zone of drill bit continuously.In one embodiment, clean peripheral air from the compressed air that well head produced, thereby sleeve pipe is pressurizeed.
These and other aspect of the present invention is described in detail with reference to the accompanying drawings.
Description of drawings
Fig. 1 is the part sectioned view according to a drilling rig of the present invention.
Fig. 2 is the part sectioned view of the amplification of the drilling rig among Fig. 1, the top connection of expression kinetic pressure head unit, compressed air inlet cover and double-wall pipe device.
Fig. 3 is the sectional drawing of the amplification of the drilling rig among Fig. 1, in more detail expression cover tube propeller.
Fig. 4 is the sectional drawing of the amplification of the drilling rig among Fig. 1, expression double-wall pipe device and casing and support indenter device, and this support indenter device is connected to the down-hole pneumatic striking mechanism with the lower contact of double-wall pipe device.
Fig. 5 is the sectional drawing of pneumatic striking mechanism under the well, comprising a drill bit device.
Fig. 5 A is the stereogram of another form of the hammer tube of pneumatic striking mechanism under the well.
Fig. 6 A is the exploded perspective view according to first embodiment of a drill bit device of the present invention.
Fig. 7 A is the stereogram of the starter among Fig. 6 A.
Fig. 7 B is the bottom view of the starter among Fig. 7 A.
Fig. 8 is the stereogram of a underream device arms using among the embodiment among Fig. 6 A.
Fig. 9 A is the end-view of a underream device arms shown in Fig. 8.
Fig. 9 B is the lateral elevational view of the underream device arms shown in Fig. 8.
Figure 10 is the angle of rake bottom view of the drill bit of the embodiment among Fig. 6 A, represent that the angle of rake axial surface of this drill bit has formed the groove that is used to hold underream device arms, this axial surface abuts against underream device arms so that the stretching out and bounce back of arms.
The angle of rake bottom view of drill bit of Figure 11 second embodiment of the present invention.
Figure 12 is the bottom view of the underream device arms of embodiment among Figure 11.
Figure 13 is the bottom view of the arms among Figure 12, represents to be in its advanced position on the drill bit propeller of this arms in Figure 11.
Figure 14 is the vertical view of the starter that uses of drill bit propeller in Figure 13 and underream device arms.
Figure 15 is the bottom view of the starter among Figure 14.
Figure 16 is drill bit propeller and the underream device arms among Figure 13, represents that its underream device arms is in its extended position.
Figure 17 is the partial view of the amplification of drill bit propeller among Figure 13 and underream device arms.
Figure 18 is the bottom view that the part of the drill bit device shown in Figure 11-17 is cut open, expression compressed air flow channel wherein.
The specific embodiment
Represent with Reference numeral 10 with reference to 1, one recycled back well system of figure, comprise that an indenter device 11, double-wall pipe device 12 and one are positioned at pneumatic striking mechanism 13 under the well of a borehole casing 14.With reference to figure 2 and 3, indenter device 11 comprises a cover tube propeller 15 and a kinetic pressure head unit 16.Wherein, described cover tube propeller 15 is used for promoting borehole casing 14 downwards when drill bit advances, and described kinetic pressure head unit 16 is a type, is used for rotating when borehole casing 14 moves down this borehole casing 14.Cover tube propeller 15 comprises an annular hammer 17, and when compressed air alternately entered in the chamber of annular hammer 17 above and belows, this annular hammer 17 was done vertical reciprocating motion.Annular hammer 17 impacts anvil 18, and 18 on this anvil impacts sleeve cap 19 again.Sleeve cap 19 is sealed on the inner surface of borehole casing 14, thereby makes borehole casing 14 being filled with certain pressure by opening 20 between the pneumatic striking mechanism 13 under sleeve cap 19 and the well.Borehole casing 14 is filled with certain pressure and makes that forming a downward air under this borehole casing 14 and the well between the pneumatic striking mechanism 13 flows, therefore can prevent the upwards migration of drilling cuttings between the pneumatic striking mechanism 13 and borehole casing 14 under the well, because this migration may hinder the taking-up of jump bit.Kinetic pressure head unit 16 is connected to anvil 18 by linkage 21, is used under double-wall pipe device and well pneumatic striking mechanism and applies and rotatablely move.Kinetic pressure head unit 16 is generality designs of this area, just its central member 22 is different, this central member 22 is by being threaded onto the upper end of double-wall pipe device 14, and comprise a medium pore that is connected with double-wall pipe device 12, be used to pass kinetic pressure head unit 16 the drilling cuttings discharge-channel is extended to bend pipe 29.Joint between central member 22 and the double-wall pipe 14 comprises an opening 23, in the inwall 25 and the annular space 24 between the outer wall 26 that is used to allow air to enter double-wall pipe device 12.Cover 27 is installed in around the joint and comprises and can enter the double-wall pipe device by these air intake 28 compressed air, to drive down-hole jump bit 13 as follows by air intake 28.The upper end of central member 22 is rotatably installed and be sealed to a bend pipe 29.And the inwall 25 of bend pipe 29, central member 22 and double-wall pipe device 14 forms a central drilling cuttings delivery pipe together, is used for as follows pneumatic striking mechanism continuous blow-down drilling cuttings under the well.
With reference to figure 4, double-wall pipe device 12 is assembled by single pipeline section, and each pipeline section comprises 31 and outer tubes 33 of pipe in.Relative two ends of each pipeline section comprise a male thread connector 33 and a box thread connector 35 respectively.In male thread connector 14 and the box thread connector 15 each includes air openings 36 and 37, and these two openings are communicated with the exterior annular space 24 of double-wall pipe device 11 respectively.The upper end of double-wall pipe device 11 central member 22 that is threaded onto kinetic pressure head unit 16.Then be connected to a casing 38 in the lower end of double-wall pipe device 11, this casing 38 is again with the support pressure head 40 that is threaded onto pneumatic striking mechanism 13 under the well.Opening 42 and 44 is connected with the annular space 24 of double-wall pipe device, thereby provides route to make the compressed air here enter pneumatic striking mechanism under the well.
With reference to figure 5, pneumatic striking mechanism 13 comprises that is threaded onto a casing 38 that supports on the pressure head 40 under the well.A sleeve 41 and hammer tube 42 usefulness are threaded onto and support on the pressure head 40.The delivery pipe 43 of a centrally-located is extruded in the sleeve 41.Wear sleeve 44 is engaged in around the hammer tube 42 and extruding is coupled to ring 45 and supports on the shoulder 46 of pressure head 40.Sleeve 41 and hammer tube 42 form the upper air chamber 48 of an annular.And central delivery pipe 43 and hammer tube 42 form the bottom air chamber 50 of an annular.The lower end and the drill bit propeller 52 of hammer tube 42 are reclining, and this hammer tube 42 also comprises circumferential lip 54, and this circumferential lip 54 engages with wear sleeve 44, thereby will hammer the central authorities that tube 42 is positioned at wear sleeve into shape.Jump bit 53 is coupled on the hammer tube 42 slidably, thereby can move back and forth.Drill bit propeller 52 is coupled in the hammer tube 42 slidably, be positioned at the below of jump bit 53 and be positioned at the top of the lower end of central delivery pipe 43.Drill bit propeller 52 remains in the hammer tube 42 by a plurality of keys 56.Each key all is coupled in the annular groove 60 of a keyway 58 and drill bit propeller 52.(referring to applicant's U.S. Pat 5511628, this patent has been introduced hereinbefore and has been carried out reference, this patent disclosure the hammer tube of another form, its hammer tube comprises similar key and splined arrangement, is used for the drill bit propeller is installed in the hammer tube).This key and splined arrangement make the drill bit device advance to the place ahead of double-wall pipe device in drilling process.
According to a drill bit device of the present invention as shown in Figure 6.Comprise a drill bit propeller 52, starter 82 and arms 88a-c with reference to 6, one drill bit devices of figure.Starter 82 comprises a upper axis 83 with Baltimore groove (recessed chamfer) 84, cam face 85a and 85b and a bottom 86.Bottom 86 comprises three peripheral groove 87a-c.Preferably the hard drilling well ball tooth of being made by Hardmetal materials is installed on the periphery and basal surface of starter (Fig. 7).Arms 88a-c is located in the top of starter 82, and as follows along certain curved path in the enterprising line slip of starter.Each arms comprises a protuberance projection 89, and this protuberance projection 89 can be received into the respective slot 90 interior (Figure 10) of drill bit propeller 52.Protuberance projection 89 has several functions.At first, the impact force from jump bit is delivered to starter 82 downwards by drill bit propeller 52, protuberance projection 89 and arms 88.Secondly, protuberance projection 89 holds and remains in the groove 90, and it can do the rotation of limited radian so that stretch out and the arms 88 that bounces back in this groove 90.When arms 88 was in its advanced position, surface 91 was adjacent with cam face 85a.In this structure, therefore the overall diameter of drill bit device allows the drill bit device to regain from borehole casing less than the internal diameter of borehole casing 14.When arms 88 under the turn clockwise effect of starter 82 and when clockwise direction rotate, inclined surface 85a engaged with surperficial 92 at drill bit propeller 52, thereby force arms 88 protruding.The rotation of arms 88 and stretching out lasts till always that surperficial 92a and surperficial 85b are reclining and surperficial 92b and surperficial 85a are reclining, thereby arms 88 is remained locked in its extended position.In order to discharge and the arms 88 that bounces back, drill bit propeller 52 rotates in opposite direction.At the complete advanced position of arms, the overall diameter of underream apparatus is less than the internal diameter of borehole casing, thereby the feasible sleeve pipe that when needed whole underream device drill bit device passed takes out.These characteristics have significant advantage with respect to underream utensil of the prior art, because arms can not bounce back by sleeve pipe and fetch where necessary in the prior art.
In operating process, compressed air is transported to annular compartment 59 by opening 37, radial opening 60, annular space 62 and axially open 64.In Fig. 5, jump bit 53 is in downward stroke.Lip 66 engages with lip 68, thereby chamber 48 is sealed.Lip 72 engages with lip 74, thus sealed chamber 50.Opening 78 is closed.When piston 53 continued to move down, opening 76 was opened, and chamber 48 discharges.Almost meanwhile, lip 74 breaks away from lip 72, thereby after piston 53 bump drill bit propellers 52, makes new compressed air charge into chamber 50 so that piston 53 is upwards given rise to its top position.When piston 53 liftings, opening 78 is opened, and chamber 50 discharges.Lip 74 engages with lip 72, thus sealed chamber 50.Opening 76 is sealed by piston 53, and lip 66 is disengaged with lip 68, thereby makes new compressed air charge into chamber 48.Re-fill in the chamber 48 and can promote piston 53 behind the compressed air and move down, thus beginning another one stroke.The compressed air that are discharged in opening 76 and 78 are collected in the opening 80 (as Fig. 5 A), are discharged in the central delivery pipe 43 by the drill bit device then, thereby are carrying drilling cuttings and stratum fragment under the bit cutting.In order to prevent that drilling cuttings from stopping up between arms 88a-c and starter, in the embodiment as shown in Fig. 6 B, provide an opening 91, compressed air can be by these opening 91 dischargings to clean drilling cuttings.It is continuous basically that compressed air passes flowing of drill bit device, thereby has realized the drilling cuttings of the drilling well work plane of boring is carried out continuous discharging.And the diameter of the substantial constant of central delivery pipe and double-wall pipe device inwall makes that also speed air flow is constant, and this helps the removing of drilling cuttings.Remove the carrying out that drilling cuttings has promoted drilling well continuously from central delivery pipe.Seldom be necessary the drill bit lifting to be come out to clean the drilling cuttings in the boring by ending drilling process.This directly causes significantly improving of drilling speed, in addition, can be removed fast when stopping up owing to drilling cuttings, so can obtain accurate relatively " core " sample in holing.This aspect of the present invention is all very useful for exploration and environmental applications.
According to another aspect of the present invention, starter 104 utilizes the underream device arms that is locked in expanded position to creep in the stratum, and this expanded position is positioned at the below of sleeve pipe front end C and radially crosses the front end C of sleeve pipe.Moving of sleeve pipe then is to realize by relatively large reaming hole area and cover tube propeller 15 (if desired).In embodiment as shown in figs. 1 and 3, if the drill bit device advances above one of the sleeve pipe front predetermined distance, then valve of connecting rod 21 operations is to be provided to compressed air pneumatic striking mechanism 17 and relevant cover tube propeller 15.
Another one embodiment of the present invention 11-19 with reference to the accompanying drawings is described.In this embodiment, the drill bit device also comprises a drill bit propeller 100, arms 102a-c and starter 104, and these parts are assembled together as the previous embodiment among Fig. 6.Yet in this embodiment, pass inside opening drill bit propeller, arms and the starter from the compressed air of opening 80 discharging along setting path.With reference to figure 1, utilize opening 106a-c to flow into and pass drill bit propeller 100 from the jump bit discharged air of opening 80.The jump bit discharged air flows respectively then and passes upward formed opening 108a-c (referring to Figure 12) of arms 102a-c.In Figure 13, arms is installed on the drill bit propeller 100 as shown in the figure, and is in its closure and advanced position.Flow among the opening 110a-c (as Figure 14, shown in 15) on the starter 104 from the discharged air of opening 108a-c, and flow through passage 112a-c, opening 114a-c enters into central delivery pipe 43 (with reference to figure 5).Position to opening 106a-c, 108a-c and 110a-c is provided with, thus make these openings can be when arms 102a-c stretches out all align; That is, opening 106a, 108a and 110a alignment, opening 106b, 108b and 110b alignment, opening 106c, 108c and 110c alignment.With reference to Figure 16,17, in the time of in drill bit propeller 100 rotates with the position that arms 102a-c is positioned at closure and retraction with respect to starter 104, opening 108a-c (passing arms 102a-c respectively) partly deviates from opening 106a-c respectively; And opening 110a-c (passing starter) deviates from opening 108a-c (passing arms 102a-c) respectively fully.Pass opening 106a-c in order also to provide when arms bounces back, the continuous air flow of 108a-c and 110a-c is moving, is provided with passage 112a-c below arms 112.With reference to Figure 15, starter 104 also comprises axial notch 114a-c and interconnection 116a-c.Groove 114a-c and passage 116a-c provide path to be used for from the outside discharges compressed air of borehole casing and to make compressed air pass through central delivery pipe 43 dischargings.
Foregoing description of the present invention is illustrative and not restrictive.Those of ordinary skill in the art should be understood that, can carry out a plurality of variations in detail in not departing from claims of the present invention institute restricted portion.
Claims (10)
1. one kind is used for the drill bit device on the pneumatic striking mechanism under the well, and this drill bit device comprises:
Compressed fluid source;
A propeller;
Pneumatic striking mechanism under the well, it is connected with described propeller, and can be operable in response to the supply of accepting compressed fluid and impact propeller;
At least one and the fluid passage that pneumatic striking mechanism under described compressed fluid source and the well is communicated with, described passage comprises elongated annular space, this annular space to small part is formed by the concentric walls that connects the pipe of pneumatic striking mechanism under Compressed Gas supply and the well;
A starter, this starter have an axle, a peripheral drilling well work plane, a soffit and a through hole that is upward through described axle extension from described soffit;
Linkage, this linkage rotatably are connected to described propeller on the described starter;
Underream device arms, this arms is rotatably installed in the centre of described propeller and described starter, and this arms comprises the underream surface, and this underream surface can navigate to the outside of the periphery of described starter;
Cam face, described cam face can with the corresponding surface engagement on the underream device arms, to be used for: underream device arms is deployed into an extended position, and this underream device arms is locked in described extended position, and by rotatablely moving and described underream device arms bounced back from described extended position between described propeller and the described starter; And
The surface forms at least one air duct between the through hole of this surface in a described angle of rake external surface and described starter.
2. drill bit device according to claim 1 is characterized in that, also comprises a passage between each described arms and its corresponding cam face.
3. drill bit device according to claim 2 is characterized in that described compressed fluid comprises compressed air.
4. drill bit device according to claim 1, also comprise in order to limit the surface of at least one fluid passage that is communicated with compressed fluid source and at least one described cam face, described fluid passage comprises a valve, and this valve is by described at least one cam face discharging compressed fluid.
5. drill bit device according to claim 1 also comprises:
A well bore casing, described first pneumatic striking mechanism is placed in this well bore casing;
A cover tube propeller, this cover tube propeller is connected on the described well bore casing.
6. drill bit device according to claim 5 is characterized in that, described cover tube propeller comprises one second pneumatic striking mechanism and a compressed air source, and described compressed air source is connected to described second pneumatic striking mechanism.
7. drill bit device according to claim 6 also comprises a valve, and this valve is connected to described second pneumatic striking mechanism and described compressed air source.
8. drill bit device according to claim 7, it is characterized in that according to the skew of the predetermined vertical between described drill bit propeller and the described well bore casing lower end, described valve is operable to open position, at this open position, compressed air is sent to second pneumatic striking mechanism.
9. drill bit device according to claim 1, it is characterized in that, between the through hole on described angle of rake external surface and the described starter, comprise at least one opening that passes each described propeller, described underream device arms and described starter in order to the surface that limits at least one air duct.
10. drill bit device according to claim 9, it is characterized in that, also comprise at least one air duct in order to the surface that limits at least one air duct between the through hole on described angle of rake external surface and the described starter, described air duct is connected with at least one opening that passes each described underream device arms and the opening that passes described starter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US89678797A | 1997-07-18 | 1997-07-18 | |
| US08/896,787 | 1997-07-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1270655A CN1270655A (en) | 2000-10-18 |
| CN1263937C true CN1263937C (en) | 2006-07-12 |
Family
ID=25406839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB988092085A Expired - Fee Related CN1263937C (en) | 1997-07-18 | 1998-07-17 | Reverse circulation drilling system with bit locked underreamer arms |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0996810A1 (en) |
| JP (1) | JP2001510256A (en) |
| KR (1) | KR20010021997A (en) |
| CN (1) | CN1263937C (en) |
| AU (1) | AU755442C (en) |
| BR (1) | BR9815553A (en) |
| CA (1) | CA2296470A1 (en) |
| HK (1) | HK1030253A1 (en) |
| WO (1) | WO1999004130A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9562392B2 (en) | 2013-11-13 | 2017-02-07 | Varel International Ind., L.P. | Field removable choke for mounting in the piston of a rotary percussion tool |
| US9328558B2 (en) | 2013-11-13 | 2016-05-03 | Varel International Ind., L.P. | Coating of the piston for a rotating percussion system in downhole drilling |
| US9404342B2 (en) | 2013-11-13 | 2016-08-02 | Varel International Ind., L.P. | Top mounted choke for percussion tool |
| US9415496B2 (en) | 2013-11-13 | 2016-08-16 | Varel International Ind., L.P. | Double wall flow tube for percussion tool |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE8901199L (en) * | 1989-04-05 | 1990-10-06 | Uniroc Ab | Eccentric drill bit |
| US5186265A (en) * | 1991-08-22 | 1993-02-16 | Atlantic Richfield Company | Retrievable bit and eccentric reamer assembly |
| US5511628A (en) * | 1995-01-20 | 1996-04-30 | Holte; Ardis L. | Pneumatic drill with central evacuation outlet |
| RU2382669C1 (en) | 2008-12-29 | 2010-02-27 | ЗАО "Твин Трейдинг Компани" | Method of extracting materials and device to this end |
-
1998
- 1998-07-17 AU AU84873/98A patent/AU755442C/en not_active Ceased
- 1998-07-17 CN CNB988092085A patent/CN1263937C/en not_active Expired - Fee Related
- 1998-07-17 KR KR1020007000564A patent/KR20010021997A/en not_active Application Discontinuation
- 1998-07-17 BR BR9815553-9A patent/BR9815553A/en not_active Application Discontinuation
- 1998-07-17 JP JP2000503316A patent/JP2001510256A/en active Pending
- 1998-07-17 WO PCT/US1998/014651 patent/WO1999004130A1/en not_active Application Discontinuation
- 1998-07-17 EP EP98935684A patent/EP0996810A1/en not_active Withdrawn
- 1998-07-17 CA CA002296470A patent/CA2296470A1/en not_active Abandoned
-
2001
- 2001-02-20 HK HK01101223A patent/HK1030253A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| AU755442C (en) | 2003-06-12 |
| HK1030253A1 (en) | 2001-04-27 |
| WO1999004130A1 (en) | 1999-01-28 |
| EP0996810A1 (en) | 2000-05-03 |
| AU755442B2 (en) | 2002-12-12 |
| BR9815553A (en) | 2001-12-11 |
| JP2001510256A (en) | 2001-07-31 |
| AU8487398A (en) | 1999-02-10 |
| KR20010021997A (en) | 2001-03-15 |
| CN1270655A (en) | 2000-10-18 |
| CA2296470A1 (en) | 1999-01-28 |
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