EP3710669A1 - A directional core drill assembly - Google Patents
A directional core drill assemblyInfo
- Publication number
- EP3710669A1 EP3710669A1 EP18811461.5A EP18811461A EP3710669A1 EP 3710669 A1 EP3710669 A1 EP 3710669A1 EP 18811461 A EP18811461 A EP 18811461A EP 3710669 A1 EP3710669 A1 EP 3710669A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- outer body
- bearing
- shaft
- drill
- core
- Prior art date
- 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.)
- Granted
Links
- 238000005553 drilling Methods 0.000 claims abstract description 51
- 239000012530 fluid Substances 0.000 claims description 41
- 230000008878 coupling Effects 0.000 claims description 24
- 238000010168 coupling process Methods 0.000 claims description 24
- 238000005859 coupling reaction Methods 0.000 claims description 24
- 230000007246 mechanism Effects 0.000 claims description 18
- 230000009471 action Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 230000008859 change Effects 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 239000011435 rock Substances 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 239000003381 stabilizer Substances 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000009194 climbing Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 241001331845 Equus asinus x caballus Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/02—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
-
- 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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/16—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors for obtaining oriented cores
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- 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
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/026—Determining slope or direction of penetrated ground layers
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
Definitions
- the present invention relates to directional core drilling operations in bedrock, and in particular an assembly for steering a core barrel along a pre-defined path and at same time collect core samples of the bedrock, using said core barrel.
- a core barrel mounted in front of a drill string is used to obtain core samples from the bedrock.
- the core barrel is tubular in shape and terminated with a tubular drill bit in front.
- a retractable core sampling arrangement including a core tube holding the core sample, and a core catcher mounted at the lower end of the core tube.
- the core sampling arrangement includes a rotational joint followed by a latching unit. The latching unit is arranged to ensure that the core sampling arrangement is fixed at a specific distance from the drill bit, preventing the core sampling arrangement from moving forward from its designated position inside the core barrel as well as being pushed upward as the core sample enters the core tube.
- the rotation of the drill string is ceased and the drill string lifted until the core catcher clamps the core and breaks it loose from the subsurface.
- a fishing unit attached to a wire line is lowered into the interior of the drill string until it connects to the latching unit located at the rear end of the core sampling arrangement.
- the fishing unit is pumped into the drill string by the drill fluid .
- the latching unit will disconnect from the core barrel, allowing the whole core sampling arrangement to be hoisted to the surface.
- a conventional core barrel should ideally follow a straight line as it penetrated the bedrock.
- the borehole trajectory may however deviate from the planned straight trajectory due to natural drift caused by the bedrock or the drill plan involves a curved trajectory.
- a steerable core barrel may be used to guide the bore hole back to the planned trajectory or to obtain a specific curved trajectory.
- a common feature in the said drills are the use of a packer element to rotationally fixate an eccentric bearing or stabilizer to the borehole wall in order to accomplish a deflection of the drill bit facing relative to the longitudinal axis of the well bore.
- the deflection is usually accomplished by using an outer body, comprising a front bearing, a rear bearing and an eccentric bearing or stabilizer placed between at the lower end of the drill, which forces an internal rotating shaft towards the opposite wall of the bore hole therewith achieving a directional deviation of the drill bit.
- the packer itself is used to accomplish a deflection of the drill bit facing.
- US2005/0109542 and US6516900 describe methods used for non-coring steerable drilling with a packer assembly.
- US2005/0109542 uses a quite complex system including sensors, actuators, valves mounted inside the drill body and an electrical cable to the topside to enable the individual pads to be activated and thus enable the packer element to be moved eccentrically to the borehole and thereby accomplish a deflection of the drill bit facing.
- US6516900 uses only one set of pads to be activated by the drill fluid in order to accomplish a deflection of the drill bit facing .
- the direction of the bit deflection denoted as toolface angle by those skilled in the art, are adjusted by setting the packer in a rotational position that provide the desired direction of deflection.
- the system depends on a pressure activated mechanical locking coupling arrangement between the outer housing and the rotating shaft to accommodate said setting of the rotational position.
- Activation/de-activation of the packer pads and the mechanical locking coupling are pre-set at two different pressure settings by use of dedicated valves.
- the patent also explains a third pressure setting that deactivates the packer to enable straight forward drilling.
- the valves are mounted as an integral part of the drill body.
- Fig. 6 Based on the flow diagram shown in Fig. 6 where the main supply line for drilling fluid is shown to be open, one can assume that the pressure build-up is obtained by a fixed restriction in the supply line arranged downstream the control valves. By changing the flow rate, the pressure increases with increased flow rate and visa versa known according to known physics of fluid dynamics. Downstream the flow restriction the drill fluid flush the drill bit and then flow back to surface in the annulus formed by the drill string and the borehole wall. In order to change the pressure settings of the valves or pressure versus flow rates one need to pull the drill topside to replace the flow restriction.
- the packer has thus no direct function with respect to the deflection mechanism as being the case for US2005/0109542 and US6516900.
- the pads is activated by arranging a constriction (fig. 3, detail 34) that the drilling fluid has to pass thought on its way to the drill bit, thus creating necessary pressure build up to the packer and locking mechanism.
- the drill fluid pressure is varied from topside by varying the drill fluid flow rate. Change in direction of the drill bit facing, denoted as the toolface angle, relay in patent N0316286B1 on a mechanical locking coupling fixed to the drill rods. By reducing the flow rate, and thus the pressure, the coupling will engage with the outer body and allow the operator to change the toolface angle by rotating the drill string at topside.
- N0316286B1 also describes use of a measuring instrument attached to a mule shoe shed to facilitate for the operator to measure the position of the outer body.
- patent US2712434 a toolface adjustment device is described.
- the patent shows a detent bolt fixed to the eccentric housing, and a notch placed on a spiral shaped surface attached to an internal rotating shaft. When said shaft is rotated counter clockwise the detent bolt will engage said notch, thus allowing the operator to rotate the outer body including the eccentric bearing in desired position.
- CA2749316C discusses an adjustable eccentric bushing assembly for a wireline- operated directional core barrel drill as shown in N0316286B1.
- the eccentric bearing comprises an outer housing with an eccentric bore and an eccentric inner sleeve carrying a bushing. By rotating the eccentric inner sleeve relative to the outer housing, the degree of deflection of the shaft can be adjusted, thus the degree of deflection of the drill bit facing.
- W02013028074 describes a trust bearing assembly for a steerable drilling system able to collect core samples as it penetrates the bedrock.
- the trust bearing assembly comprises a stator bearing plate with a convex or concave side opposite to the bearing elements that engages a matching support plate attached to the stationary outer body. Furthermore the trust bearing assembly comprises a rotor bearing plate that engages the drill string.
- the trust bearing assembly is located inside the tubular structure that is a part of the outer body.
- the tubular structure has multiple transverse holes close to the said bearing plates. Said transverse holes provide a fluid passage between the bearing compartment to the annulus between the outer body and the borehole wall thus provide cooling for the bearing elements.
- a significant disadvantage of the existing directional drills pressurized by the drilling fluid is the dependency on a steady and pre-determined flow rate to achieve correct pressurization for the drill control functions, with- or without valves, because the pressure build up is established by a constriction of the drill fluid passage at the drill bit.
- This is highly problematic as the flow rate is one of the main parameters for the drilling operator to ensure good working conditions for the drill bit.
- the drill fluid prime function is to provide cooling of the drill bit and transport of rock debris out of the hole, but it is common to adjust the flow rate to maintain bit sharpness or even reduce the flow rate close to zero in short periods to sharpen the drill bit. Limitation on flow rate is also problematic for the high volume flow rates required for pumping instruments or core tubes in horizontal or climbing holes.
- the main object of the invention is to provide a device and method for the pressurization of a directional core drill packer assembly that ensure the packer pads are exposed to a predefined pressure regardless of flow rate.
- Another object of the invention is to enable adjustment of the predefined packer pressure without pulling the drill to the surface.
- Another object of the invention is to enable unrestricted adjustment of flow rate to the drill bit during drilling thus facilitate for the operator to freely adjust the flow rate without effecting the pressure to the said packer pads.
- Another object of the invention is to enable high volume flow for pumping core tubes and survey instruments, without significantly increasing the system pressure.
- Another object of the invention is to provide a safety feature to avoid uncontrolled pressure spikes when using high volume flow rates for the pumping the core tube thought the drill string and a reliable landing indicator at the same time.
- Another object of the invention is to enable easier and more reliable adjustment of the toolface angle in steerable core barrels by use of an instantly engaged coupling between the shaft and outer housing that is not dependent on the drill fluid pressure.
- Another object of the invention is to enable adjustment of the of drill bit deflection in steerable core barrels without changing the toolface angle.
- Another object of the invention is to provide a trust bearing assembly for steerable core barrels that maximize the cooling of the bearing elements and maximize the diameter of the core samples.
- An assembly for controlling the pressure to a packer in a steerable core barrel assembly is disclosed.
- a pressure controlled valve is integrated into the retrievable core tube assembly to ensure the packer is always correctly pressurized.
- the system functionality is monitored topside by reading the drill fluid pressure and flow rate; no or limited flow rate should be monitored prior to reaching the pre-set packer pressure.
- the pre-set packer pressure can be adjusted at a suitable time when the core tube assembly is retrieved to surface, typically every 3 rd meter of drilling to empty the rock sample from the core tube.
- the pre-set packer pressure will act as a maximum pressure that can be obtained by the system, thus working as a safety feature for the system and a landing indicator for the core tube when pumped into the drill string.
- an assembly for adjustment of the toolface angle in steerable core barrels that minimize need for rotation of the drill string and do not depend on system fluid pressure.
- an instant counter clockwise engaged coupling is arranged between the outer body and the rotational shaft, said coupling has a hollow inner diameter that facilitate a core tube to pass through. The engagement takes place independent of the rotational position of the shaft relative to the outer stationary body, thus facilitate instant correction of toolface if needed.
- an assembly for adjustment of drill bit deviation in steerable core barrels without affecting the toolface angle is disclosed.
- the eccentric bearing is supported by a 3-point support arrangement where the bearing is allowed to tilt in the drill longitudinal direction, thus aligning with the deflected shaft.
- an assembly for improving the cooling of trust bearings in steerable core barrels as well as facilitate maximum diameter of the core samples is disclosed.
- an arrangement for direct exposure of the bearing element to the drilling fluid and maximization of bearing inner diameter is accomplished.
- FIG. 1 shows a schematic illustration of a steerable drilling system able to collect core samples as it penetrates the bedrock, which assembly includes according to prior art technology; a deflection mechanism to accomplish deviation of the drill bit, a packer, a retrievable core tube assembly, a trust bearing and according to the present invention, a packer pressure control device integrated into the core tube assembly.
- FIG. 2 shows a schematic illustration of a retrievable core tube assembly for a steerable drilling system comprising a packer pressure control device according to the present invention.
- FIG. 3 shows a schematic illustration of the detailed assembly of a packer for a steerable drilling system able to collect core samples as it penetrates the bedrock, comprising a pressure control device according to the present invention.
- FIG. 4 shows a preferred embodiment of the invention including a device equalizing the pressure across the core tube assembly prior to retrieval in case the return drill fluid leaks in to the underground structure.
- FIG. 5 shows according to the invention a schematic illustration of a preferred embodiment of the retrievable tube section comprising the adjustable pressure control valve as well as the adjusting mechanism .
- FIG. 6 shows according to the invention a cross sectional view A-A shown in FIG. 1 of a preferred embodiment of the coupling mechanism between the shaft and outer housing to enable adjustment of the toolface angle.
- FIG. 7 shows according to the invention a schematic illustration of a preferred adjustment mechanism for drill bit deflection in a steerable drilling system able to collect core samples as it penetrates the bedrock.
- FIG. 8 shows according to the invention a cross sectional view B-B shown in FIG. 7 of a preferred adjustment mechanism for drill bit deflection in a steerable drilling system able to collect core samples as it penetrates the bedrock.
- FIG. 9 shows according to the invention a schematic illustration of a preferred trust bearing assembly for a steerable drilling system able to collect core samples as it penetrates the bedrock.
- FIG. 10 shows according to the invention the exterior of a preferred trust bearing assembly as shown in FIG. 8.
- a directional core drill assembly ( 1) includes as a minimum the following prior art embodiments;
- a core tube assembly (4) comprising a core tube ( 10) and a releasable
- the core tube has a swivel element (7) that enables the upper section of the core tube assembly to rotate due to the coupling to the shaft and the lower core tube ( 10) section to be stationary due to the frictional coupling to the rock sample during drilling.
- a non-rotating outer body (3) that houses a packer with packer pads ( 15) and a shaft deflection mechanism comprising an eccentric bearing ( 12), a front bearing ( 13) and a rear bearing ( 11) .
- an axial trust bearing (6) to enable the non-rotating outer body (3) to be pushed downwards while drilling.
- the packer assembly with a retrievable pressure control device according to the invention is denoted (9) in FIG 1 and further detailed in FIG 2 and FIG 3. A detailed explanation of the invention follows;
- Drill fluid is pumped down through the drill string (2) comprising a hollow inner flow passage (20).
- the drilling fluid will enter the annulus (21) between the outer diameter of the core tube assembly (4) and the inner diameter of the shaft (5).
- the seal ( 18) mounted on the core tube assembly (4) is blocking for further passage of drilling fluid along the annulus (21).
- the seal ( 18) and a traverse opening (24) lead the drilling fluid into cavity (25) located inside the core tube assembly (4).
- the cavity (25) is confined by the wall ( 17) and a spring loaded valve (29).
- the feed drilling fluid further communicate directly to the packer cavity (23) via the annulus (21) thought the traverse opening (22) in the shaft (5).
- the packer cavity (23) is confined by seals ( 16) in both ends and a packer bladder not shown said seals ( 16) are sealing between shaft (5) and the outer body (3) .
- the packer bladder could be made out of a flexible, but robust material such as reinforced rubber, and are sealing the full length and circumference of the packer cavity (23). Said packer bladder may be equipped with a protection pad to avoid the packer pads ( 15) to wear the packer bladder.
- the spring loaded valve (29) can be adjusted to allow drilling fluid to pass at a defined pressure (PI) . The spring load can be adjusted when the core tube is retrieved to surface.
- the drill fluid is returned to surface via the annulus formed between the borehole and the outer body (3)/drill string (2), respectively.
- the bottom hole pressure (P2) downstream the spring loaded valve (2) is determined by the static liquid column plus the frictional losses in all flow passages downstream the valve and to the surface.
- the functionality of the packer pressure control device can conveniently be checked while the drill tool is down hole by the following procedure while the drill tool is not rotating;
- the same procedure can be performed while the drill is at surface.
- FIG 4 shows how this problem is solved according to a preferred embodiment the invention. A detailed explanation of the invention follows;
- Cavity (25) is confined by the wall (17) and a spring loaded hollow valve (29) resting against a hollow longitudinal valve seat (31).
- the valve seat (31) is connected to an annulus (32) leading thought wall (17) and ending in a second valve (33).
- the valve (33) is connected to the core barrel assembly hoisting hook in such manner that when the core tube assembly locking means (not shown) is being retracted by the wire line tool (8) in order to free the core tube assembly from its seat, valve (33) will be lifted from its seat as well. This will open for passage of drill fluid though annulus (34) and as a consequence equalize pressures PI and P2.
- valve (29) is shown closed that implies the drill fluid has been shut off.
- Valve (33) is shown in an open position that implies the core tube assembly (4) is being retrieved by pulling the wire line tool (8).
- FIG. 5 shows according to the invention a detailed section in FIG. 2 of a preferred embodiment of the adjustment principle of the packer control valve (29). A detailed explanation follows.
- the spring seat (35) slides along the inner wall of the core tube assembly (3).
- a cylindrical sleeve with threads (36) is located at the inner wall of the core tube assembly (3), just beyond the spring seat (35).
- Another centrally arranged cylindrical adjustment sleeve (39) with threads is arranged inside the sleeve (36).
- the threads on sleeve (36) intersect with the threads in adjustment sleeve (39).
- the pre-set packer pressure (PI) will be the maximum pressure that can be obtained in the system, thus acting like a safety feature for the drill. Such pressure limitation would eliminate the danger of system failure due overpressure that could damage to components such as extruding or bursting packer bladder and seals (16,18). Furthermore the pre-set packer pressure (PI) would work as a landing indicator for the core tube (4). When the core tube (4) is pumped in into the drill string in order to be seated inside the steerable core barrel the pressure will rise equal to pressure (PI), thus provide an easy recognizable indication of that the said core tube assembly (4) is correctly seated and the drill ready for use.
- the packer assembly (9) can be configured with different numbers of packer pads ( 15), both in longitudinal direction and around the circumference.
- the said pads could have any shape and surface area suitable, as well as having a very hard outer layer to avoid premature wear, or spikes or longitudinal placed knifes cutting into the bore hole wall.
- valves (29) and (33) The shown specific schematic configurations of valves (29) and (33) and
- valve adjustment device shown in FIG 1,2, 3, 4 and 5 are only meant for illustration.
- the seal ( 18), valves (29)/(33) and valve adjustment device can be arranged at any suitable physical location above the swirl element (7) on the retrievable core tube assembly and arranged in many configurations, although providing the same adjustable packer pressure control function according to the invention.
- the seals ( 16) can be located at any suitable place along the shaft (4) and its couplings.
- the adjustment sleeve (39) is placed to work on the valve seat instead (60) of the valve spring (61).
- valve (29) is arranged with a small leakage fluid passage to facilitate a moderate flow thought the bit ( 14) without building up significant pressure in the system or for de-pressurization without hoisting the core tube assembly.
- Said leakage may be located at any suitable place on the core tube assembly (4) or outer body (5).
- packer pads ( 15) is replaced with one or more pistons, said pistons sealing against the outer body (5), thus no packer bladder is needed.
- the packer bladder is replaced with a pressure operated wedge.
- the packer pads ( 15) would rest on the said wedge, and the wedge is able to slide along the interior of the packer assembly (9) in order to provide a radially movement of the packer pads ( 15).
- the packer assembly is divided into two separate sections with some distance between each in order to provide better grip towards the bore hole wall when drilling in soft or very broken rock formations.
- FIG. 6 shows according to the invention a cross sectional view A-A in FIG. 1 of a preferred embodiment of the coupling mechanism between the shaft and outer housing to enable adjustment of the toolface angle.
- a cylindrical locking housing (40) is fixed to the outer body (3) . Inside the cylindrical locking housing (40) a number of non-revolving asymmetric figure-eight shaped sprags (41) are placed. The sprags (41) are resting against shaft (5). When the shaft (5) rotates in one direction the sprags (41) slip or free-wheel, but when a torque is applied in the opposite direction, the sprags (41) tilt slightly, producing a wedging action that rotationally locks the cylindrical housing (40) and shaft (5) to each other because of friction.
- the engagement thus takes place independent of the rotational position of the shaft relative to the outer stationary body.
- the sprags (41) are spring-loaded so that they lock with very little backlash.
- the system is arranged so that the shaft (5) can rotate freely clock wise ie. equal to drill bit ( 14) rotational direction and locks counter clockwise.
- both rotational movement of the drill string (2) and flow of drilling fluid are ceased thus unloading the packer pads ( 15) .
- By rotating the drill string top side counter clockwise the drill shaft (5) will rotate equally, causing the sprags (41) to lock the cylindrical housing (40) to the shaft (5).
- the outer body (3) will be
- the specific schematic configurations of a system for adjusting the toolface angle shown in FIG 6 are only meant for illustration.
- the spring loaded sprags (41) can have any shape or made of any material as long as they provide the same wedging action that rotationally locks the cylindrical housing (40) and shaft (5) to each other because of friction.
- Such other embodiments could be, but not limited to sprags engaging a cogwheel or different sprag configuration, shaped inserts or rolling elements that wedges or engages when the said shaft is turned counter clock wise.
- the physical location of the said system for adjusting the toolface angle can be located at any place along the shaft (5) as well as in connection with any shaft coupling to provide the same instant one-way locking function according to the invention.
- FIG. 7 and FIG. 8 shows according to the invention a system for adjusting the drill bit deflection leaving the toolface angle unaffected .
- FIG. 8 shows the cross sectional view B-B in FIG : 7.
- FIG. 7 and FIG. 8 an outer body (3), comprising a front bearing ( 13), a rear bearing ( 11) and an adjustable eccentric bearing ( 12) placed between, forces an internal rotating shaft (5) towards the opposite wall of the bore hole therewith achieving a directional deviation of the drill bit.
- the eccentric bearing assembly comprises an eccentric bearing housing (42) with a slot shaped inner bore with two tracks (50) going longitudinally along the bore.
- the housing (42) has a centrally arranged threaded traverse hole (43) to accommodate an adjustment screw (44) and an adjustment pad (45).
- Said adjustment screw (44) has a concave inner diameter and the adjustment pad (45) a convex end that match each other.
- a deflection bearing element (46) with two radially protruding side pads or bolts (47) is arranged inside the eccentric bearing housing (42).
- Said side bolts or pads (47) are mounted in fixed seats in such way that they cannot move out of the seat, but still able to rotate freely and thereby allowing the bearing element (46) to tilt around the axis of the said bolts or pad (47).
- the bolt seats are preferably placed at the middle of the bearing element (46), when seen from a side view, in such way that the bearing has equal distance to each end as well as equal distance between top and bottom, measured from the centre of the bolt seat.
- Said side pads or bolts (47) are further engaging a wedge (48) that may slide along the bearing housing (42) tracks (50) and a stop bar or edge (49). The wedge position is adjusted by the position of a threaded flange ring (51).
- Said flange ring (51) can be adjusted from outside thought a slot (52) in the eccentric bearing housing (42) by a special key tool.
- the degree of shaft (5) deflection can be adjusted by changing the height of the adjustment screw (44) and the adjustment pad (45) working on the deflection bearing element (46). In combination the two elements can cover a large number of deflection settings. As an example 5 different screw heights and 5 pad heights will provide 25 different deflection settings.
- the flange ring (51) is tighten up in order for the wedges (48) to engage the side pads or bolts (47), thus locking the deflection bearing element (46) in a fixed position axially and radially.
- the deflection bearing element (46) is yet able to tilt allowing the deflection bearing element (46) to align with the shaft (5) at any deflection degree.
- the bearing element (46) may be made of the same material thought just have a layer with material matching the shaft properties.
- FIG. 7 and FIG. 8 The specific schematic configuration of a device for adjusting the degree of drill bit deflection shown in FIG. 7 and FIG. 8 is only meant for illustration.
- FIG. 7 and FIG. 8 it is known many similar configurations to achieve the same 3-point support functionality according to the invention which is; • locking the deflection bearing element (46) in a fixed position axially and radially and simultaneously
- the adjustment screw (44) and the adjustment pad (45) can be replaced by for instance an adjustable wedge or can have many different shapes and still provide the same functionality regarding deflection and axially alignment of the bearing element (46).
- the side pads or bolts (47) can have any shape that enables the bearing element (46) to align with axis of the shaft (5). Furthermore the bolts or pads (47) can be fixed to the bearing element or be machined as a part of the bearing element or be placed away from the centre of the bearing side, although this not ideally for the tilting movement.
- the side tracks (50), the stop bar (49) and wedge (48) can have many shapes and still provide the same functionality to lock the side pads or bolt (47).
- FIG. 9 and FIG. 10 shows according to the invention a preferred embodiment of a trust bearing assembly that facilitate direct cooling of the bearing elements as well as maximize the diameter of the core sample within the physically limitation set forth by the outer body (3) diameter and the drill bit (14) outer diameter.
- a trust bearing (6) comprises a stator element (6A) and a rotor element (6B), said stator element (6A) having a convex or concave side (55) opposite to the bearing contact surfaces (53).
- a radial bearing Next to the axial trust bearing stator element (6A) there is arranged a radial bearing (57).
- the outer body (3) has a convex or concave shaped end (58) engaging with the stator element (6B) in such way that the stator element (6B) and rotor element (6A) is always aligned.
- the stator element (6A) is thus not fixed to the radial bearing housing (56), but a stop bar (59) fixed to the outer body (3) prevents the stator element (6A) from rotation.
- Said trust bearing (6) having an outer diameter similar or close to the outer body (3), thus having the maximum size possible within the physically limitation set forth by the diameter of the outer body (3) and the drill bit ( 14).
- the trust bearing (6) By having the trust bearing (6) fully exposed to the annulus between the outer body and the borehole wall the trust bearing elements (6) are directly exposed to the return drilling fluid, thus maximizing the cooling of said trust bearing (6).
- the design facilitates extraction of core samples thought the centre of the trust bearing (6) with a maximum diameter to what is physically possible.
- the trust bearing (6) need a given minimum contact area to carry the trust force, the bearing inner diameter, and thus the core sample diameter, is determined by the bearing outer diameter.
- the trust bearing (6) further comprise diamond or similar very hard contact surfaces in order to allow the bearing to be exposed to the drilling fluid without extensive wear.
- FIG. 9 and FIG. 10 The specific schematic configurations of a trust bearing assembly shown in FIG. 9 and FIG. 10 are only meant for illustration. For those skilled in the art it is known many configurations to provide similar functionality according to the invention.
- convex and concave shape is replaced with one or more tilt compensation spring washers or other flexible structure, such as but not limited to rubber seat, springs or flexible metal ring with or without radial compression slots or similar.
- stop bar (59) is fixed to the stator element (6B), engaging the outer body (3).
- bearing elements (6) is covered by a mesh of similar thin wall structure to avoid foreign objects to enter the space between the bearing elements (6).
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- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Earth Drilling (AREA)
- Drilling Tools (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20171838A NO344679B1 (en) | 2017-11-17 | 2017-11-17 | A directional core drill assembly |
PCT/EP2018/081552 WO2019096990A1 (en) | 2017-11-17 | 2018-11-16 | A directional core drill assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3710669A1 true EP3710669A1 (en) | 2020-09-23 |
EP3710669B1 EP3710669B1 (en) | 2021-10-13 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP18811461.5A Active EP3710669B1 (en) | 2017-11-17 | 2018-11-16 | A directional core drill assembly |
Country Status (5)
Country | Link |
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EP (1) | EP3710669B1 (en) |
AU (1) | AU2018367221B2 (en) |
CA (1) | CA3082745A1 (en) |
NO (1) | NO344679B1 (en) |
WO (1) | WO2019096990A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023280480A1 (en) * | 2021-07-09 | 2023-01-12 | Aziwell As | System and method for position and orientation detection of a downhole device |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO346547B1 (en) * | 2020-01-06 | 2022-10-03 | Devico As | A retrievable inner assembly of a directional drill |
NO346836B1 (en) * | 2020-07-10 | 2023-01-23 | Devico As | Orientation system for directional drills and method for orientation or re-orientation of a direction drill |
CN112377131B (en) * | 2020-10-29 | 2022-09-06 | 中煤科工集团西安研究院有限公司 | Nearly-horizontal directional continuous coring device and method |
CN112282740B (en) * | 2020-10-30 | 2022-10-04 | 中国地质大学(武汉) | Pressure-feed signaling type continuous coring device for geological exploration of horizontal directional drilling engineering |
US20240117712A1 (en) * | 2022-10-07 | 2024-04-11 | Halliburton Energy Services, Inc. | Latch collet including unique torque buttons |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
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US2712434A (en) | 1953-11-23 | 1955-07-05 | Melvin L Giles | Directional drilling tool |
SE508950C2 (en) | 1993-12-29 | 1998-11-16 | Lars Liw | Steering tool for rock drilling |
NO308552B1 (en) | 1998-12-09 | 2000-09-25 | Devico As | Device for non-conforming drills |
NO316286B1 (en) * | 2001-03-05 | 2004-01-05 | Devico As | Non-conforming drill with core tube |
GB2408526B (en) | 2003-11-26 | 2007-10-17 | Schlumberger Holdings | Steerable drilling system |
RU2482274C2 (en) * | 2008-10-31 | 2013-05-20 | Шлюмбергер Текнолоджи Б.В. | Integrated system of core drilling |
CA2749316C (en) * | 2011-08-22 | 2013-08-20 | Devico As | Adjustable eccentric bushing assembly for a wireline-operated directional core barrel drill |
CA2749221C (en) | 2011-08-22 | 2013-12-10 | Devico As | Thrust bearing assembly for a wireline-operated directional core barrel drill |
WO2016043752A1 (en) * | 2014-09-18 | 2016-03-24 | Halliburton Energy Services, Inc. | Releasable locking mechanism for locking a housing to a drilling shaft of a rotary drilling system |
AU2017210756A1 (en) * | 2016-01-27 | 2018-08-16 | Reflex Instruments Asia Pacific Pty Ltd | Method and system for enabling acquisition of borehole survey data and core orientation data |
AU2017220389A1 (en) * | 2016-02-15 | 2018-08-30 | Globaltech Corporation Pty Ltd | Downhole surveying and core sample orientation systems, devices and methods |
WO2017176127A1 (en) * | 2016-04-08 | 2017-10-12 | Huygens As | A core drilling system and method for obtaining an orientated rock core sample using said core drilling system |
NO341987B1 (en) * | 2016-07-13 | 2018-03-12 | Devico As | Directional drill |
-
2017
- 2017-11-17 NO NO20171838A patent/NO344679B1/en active IP Right Review Request
-
2018
- 2018-11-16 CA CA3082745A patent/CA3082745A1/en active Pending
- 2018-11-16 WO PCT/EP2018/081552 patent/WO2019096990A1/en unknown
- 2018-11-16 AU AU2018367221A patent/AU2018367221B2/en active Active
- 2018-11-16 EP EP18811461.5A patent/EP3710669B1/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023280480A1 (en) * | 2021-07-09 | 2023-01-12 | Aziwell As | System and method for position and orientation detection of a downhole device |
Also Published As
Publication number | Publication date |
---|---|
AU2018367221B2 (en) | 2024-04-18 |
CA3082745A1 (en) | 2019-05-23 |
NO344679B1 (en) | 2020-03-02 |
AU2018367221A1 (en) | 2020-06-04 |
NO20171838A1 (en) | 2019-05-20 |
EP3710669B1 (en) | 2021-10-13 |
WO2019096990A1 (en) | 2019-05-23 |
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