EP3207206B1 - Bohrmeissel mit selbsteinstellenden auflagen - Google Patents

Bohrmeissel mit selbsteinstellenden auflagen Download PDF

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Publication number
EP3207206B1
EP3207206B1 EP15850810.1A EP15850810A EP3207206B1 EP 3207206 B1 EP3207206 B1 EP 3207206B1 EP 15850810 A EP15850810 A EP 15850810A EP 3207206 B1 EP3207206 B1 EP 3207206B1
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EP
European Patent Office
Prior art keywords
chamber
rate
fluid
piston
control device
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.)
Active
Application number
EP15850810.1A
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English (en)
French (fr)
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EP3207206A4 (de
EP3207206A1 (de
Inventor
Jayesh R. Jain
Benjamin Baxter
Chaitanya K. Vempati
Steven R. Radford
Volker Peters
Gregory L. Ricks
Juan Miguel Bilen
Holger Stibbe
David A. Curry
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baker Hughes Holdings LLC
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Baker Hughes Holdings LLC
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Filing date
Publication date
Priority claimed from US14/516,340 external-priority patent/US9708859B2/en
Application filed by Baker Hughes Holdings LLC filed Critical Baker Hughes Holdings LLC
Publication of EP3207206A1 publication Critical patent/EP3207206A1/de
Publication of EP3207206A4 publication Critical patent/EP3207206A4/de
Application granted granted Critical
Publication of EP3207206B1 publication Critical patent/EP3207206B1/de
Active legal-status Critical Current
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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
    • E21B10/00—Drill bits
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable

Definitions

  • This disclosure relates generally to drill bits and systems that utilize same for drilling wellbores.
  • Oil wells are drilled with a drill string that includes a tubular member having a drilling assembly (also referred to as the "bottomhole assembly” or “BHA”).
  • BHA typically includes devices and sensors that provide information relating to a variety of parameters relating to the drilling operations (“drilling parameters”), behavior of the BHA (“BHA parameters”) and parameters relating to the formation surrounding the wellbore (“formation parameters”).
  • a drill bit attached to the bottom end of the BHA is rotated by rotating the drill string and/or by a drilling motor (also referred to as a "mud motor”) in the BHA to disintegrate the rock formation to drill the wellbore.
  • a drilling motor also referred to as a "mud motor”
  • a large number of wellbores are drilled along contoured trajectories.
  • a single wellbore may include one or more vertical sections, deviated sections and horizontal sections through differing types of rock formations.
  • the rate of penetration (ROP) of the drill changes and can cause (decreases or increases) excessive fluctuations or vibration (lateral or torsional) in the drill bit.
  • the ROP is typically controlled by controlling the weight-on-bit (WOB) and rotational speed (revolutions per minute or "RPM”) of the drill bit so as to control drill bit fluctuations.
  • WB weight-on-bit
  • RPM rotational speed
  • the WOB is controlled by controlling the hook load at the surface and the RPM is controlled by controlling the drill string rotation at the surface and/or by controlling the drilling motor speed in the BHA.
  • Controlling the drill bit fluctuations and ROP by such methods requires the drilling system or operator to take actions at the surface. The impact of such surface actions on the drill bit fluctuations is not substantially immediate.
  • Drill bit aggressiveness contributes to the vibration, whirl and stick-slip for a given WOB and drill bit rotational speed.
  • "Depth of Cut” (DOC) of a drill bit generally defined as "the distance the drill bit advances along axially into the formation in one revolution," is a contributing factor relating to the drill bit aggressiveness. Controlling DOC can provide smoother borehole, avoid premature damage to the cutters and prolong operating life of the drill bit.
  • the disclosure herein provides a drill bit and drilling systems using the same configured to control the rate of change of instantaneous DOC of a drill bit during drilling of a wellbore.
  • US 7,240,744 discloses a downhole rotary drilling tool according to the preamble of claim 1 and a method of drilling a wellbore according to the preamble of claim 6, and in particular relates to a rotary and mud powered percussive drill bit assembly and method.
  • US 2007/0221408 discloses a method of drilling at a resonant frequency.
  • US 2,169,502 discloses a wellbore enlarging tool.
  • US 4,007,797 discloses a device for drilling a hole in the side wall of a bare hole.
  • US 6,142,250 discloses a rotary drill having moveable formation engaging members.
  • a downhole rotary drilling tool is provided, as claimed in claim 1.
  • FIG. 1 is a schematic diagram of an exemplary drilling system 100 that may utilize drill bits made according to the disclosure herein.
  • FIG. 1 shows a wellbore 110 having an upper section 111 with a casing 112 installed therein and a lower section 114 being drilled with a drill string 118.
  • the drill string 118 is shown to include a tubular member 116 with a BHA 130 attached at its bottom end.
  • the tubular member 116 may be made up by joining drill pipe sections or it may be a coiled-tubing.
  • a drill bit 150 is shown attached to the bottom end of the BHA 130 for disintegrating the rock formation 119 to drill the wellbore 110 of a selected diameter.
  • Drill string 118 is shown conveyed into the wellbore 110 from a rig 180 at the surface 167.
  • the exemplary rig 180 shown is a land rig for ease of explanation.
  • the apparatus and methods disclosed herein may also be utilized with an offshore rig used for drilling wellbores under water.
  • a rotary table 169 or a top drive (not shown) coupled to the drill string 118 may be utilized to rotate the drill string 118 to rotate the BHA 130 and thus the drill bit 150 to drill the wellbore 110.
  • a drilling motor 155 (also referred to as the "mud motor”) may be provided in the BHA 130 to rotate the drill bit 150. The drilling motor 155 may be used alone to rotate the drill bit 150 or to superimpose the rotation of the drill bit by the drill string 118.
  • a control unit (or controller) 190 which may be a computer-based unit, may be placed at the surface 167 to receive and process data transmitted by the sensors in the drill bit 150 and the sensors in the BHA 130, and to control selected operations of the various devices and sensors in the BHA 130.
  • the surface controller 190 may include a processor 192, a data storage device (or a computer-readable medium) 194 for storing data, algorithms and computer programs 196.
  • the data storage device 194 may be any suitable device, including, but not limited to, a read-only memory (ROM), a random-access memory (RAM), a flash memory, a magnetic tape, a hard disk and an optical disk.
  • a drilling fluid 179 from a source thereof is pumped under pressure into the tubular member 116.
  • the drilling fluid discharges at the bottom of the drill bit 150 and returns to the surface via the annular space (also referred as the "annulus") between the drill string 118 and the inside wall 142 of the wellbore 110.
  • the BHA 130 may further include one or more downhole sensors (collectively designated by numeral 175).
  • the sensors 175 may include any number and type of sensors, including, but not limited to, sensors generally known as the measurement-while-drilling (MWD) sensors or the logging-while-drilling (LWD) sensors, and sensors that provide information relating to the behavior of the BHA 130, such as drill bit rotation (revolutions per minute or "RPM”), tool face, pressure, vibration, whirl, bending, and stick-slip.
  • the BHA 130 may further include a control unit (or controller) 170 that controls the operation of one or more devices and sensors in the BHA 130.
  • the controller 170 may include, among other things, circuits to process the signals from sensor 175, a processor 172 (such as a microprocessor) to process the digitized signals, a data storage device 174 (such as a solid-state-memory), and a computer program 176.
  • the processor 172 may process the digitized signals, and control downhole devices and sensors, and communicate data information with the controller 190 via a two-way telemetry unit 188.
  • the drill bit 150 includes a face section (or bottom section) 152.
  • the face section 152 or a portion thereof faces the formation in front of the drill bit or the wellbore bottom during drilling.
  • the drill bit 150 in one aspect, includes one or more pads 160 that may be extended and retracted from a selected surface of the drill bit 150.
  • the pads 160 are also referred to herein as the "extensible pads,” “extendable pads,” or “adjustable pads.”
  • a suitable actuation device (or actuation unit) 165 in the drill bit 150 may be utilized to extend and retract one or more pads from a drill bit surface during drilling of the wellbore 110.
  • the actuation device 165 may control the rate of extension and retraction of the pad 160.
  • the actuation device is also referred to as a "rate control device” or “rate controller.”
  • the actuation device automatically adjusts or self-adjusts the extension and retraction of the pad 160 based on or in response to the force or pressure applied to the pad 160 during drilling and may be a passive device.
  • actuation device 165 and pad 160 are actuated by contact with the formation. Further, a substantial force on pads 160 is experienced when the depth of cut of drill bit 150 is changed rapidly. Accordingly, it is desirable for actuation mechanism 165 to resist changes to the depth of cut.
  • actuation mechanism 165 will increase the weight on bit at a given depth of cut. In other embodiments, actuation mechanism 165 will reduce the depth of cut for a given weight on bit.
  • the rate of extension and retraction of the pad may be preset as described in more detail in reference to FIGS. 2-4 .
  • FIG. 2 shows an exemplary drill bit 200 made according to one embodiment of the disclosure.
  • the drill bit 200 is a polycrystalline diamond compact (PDC) bit having a bit body 201 that includes a neck or neck section 210, a shank 220 and a crown or crown section 230.
  • the drill bit 200 is any suitable drill bit or formation removal device for use in a formation.
  • drill bit 200 is any suitable downhole rotary tool.
  • the neck 210 has a tapered upper end 212 having threads 212a thereon for connecting the drill bit 200 to a box end of the drilling assembly 130 ( FIG. 1 ).
  • the shank 220 has a lower vertical or straight section 222 that is fixedly connected to the crown 230 at a joint 224.
  • the crown 230 includes a face or face section 232 that faces the formation during drilling.
  • the crown 230 includes a number of blades, such as blades 234a, 234b, etc.
  • a typical PDC bit includes 3-7 blades.
  • Each blade has a face (also referred to as a "face section") and a side (also referred to as a "side section").
  • blade 234a has a face 232a and a side 236a
  • blade 234b has a face 232b and a side 236b.
  • the sides 236a and 236b extend along the longitudinal or vertical axis 202 of the drill bit 200.
  • Each blade further includes a number of cutters. In the particular embodiment of FIG.
  • blade 234a is shown to include cutters 238a on a portion of the side 236a and cutters 238b along the face 232a while blade 234b is shown to include cutters 239a on the side 239a and cutters 239b on the face 232b.
  • the drill bit 200 includes one or more elements or members (also referred to herein as pads) that extend and retract from a surface 252 of the drill bit 200.
  • FIG. 2 shows a pad 250 movably placed in a cavity or recess 254 in the crown section 230.
  • An activation device 260 may be coupled to the pad 250 to extend and retract the pad 250 from a drill bit surface location 252.
  • the activation device 260 controls the rate of extension and retraction of the pad 250.
  • the device 260 extends the pad at a first rate and retracts the pad at a second rate.
  • the first rate and second rate may be the same or different rates.
  • the rate of extension of the pad 250 may be greater than the rate of retraction.
  • the device 260 also is referred to herein as a "rate control device” or a “rate controller.”
  • the pad 250 is directly coupled to the device 260 via a mechanical connection or connecting member 256.
  • the device 260 includes a chamber 270 that houses a double acting reciprocating member, such as a piston 280, that sealingly divides the chamber 270 into a first chamber 272 and a second chamber or reservoir 274. Both chambers 272 and 274 are filled with a hydraulic fluid 278 suitable for downhole use, such as oil.
  • a biasing member such as a spring 284, in the first chamber 272, applies a selected force on the piston 280 to cause it to move outward. Since the piston 280 is connected to the pad 250, moving the piston outward causes the pad 250 to extend from the surface 252 of the drill bit 200.
  • the chambers 272 and 274 are in fluid communication with each other via a first fluid flow path or flow line 282 and a second fluid flow path or flow line 286.
  • a flow control device such as a check valve 285, placed in the fluid flow line 282, is utilized to control the rate of flow of the fluid from chamber 274 to chamber 272.
  • another flow control device such as a check valve 287, placed in fluid flow line 286, is utilized to control the rate of flow of the fluid 278 from chamber 272 to chamber 274.
  • the flow control devices 285 and 287 may be configured at the surface to set the rates of flow through fluid flow lines 282 and 286, respectively.
  • the rates may be set or dynamically adjusted by an active device, such as by controlling fluid flows between the chambers by actively controlled valves.
  • the fluid flow is control actively by adjusting fluid properties by using electro or magneto rhological fluids and controllers.
  • piezo electronics are utilized to control fluid flows.
  • one or both flow control devices 285 and 287 may include a variable control biasing device, such as a spring, to provide a constant flow rate from one chamber to another. Constant fluid flow rate exchange between the chambers 272 and 274 provides a first constant rate for the extension for the piston 280 and a second constant rate for the retraction of the piston 280 and, thus, corresponding constant rates for extension and retraction of the pad 250.
  • the size of the flow control lines 282 and 286 along with the setting of their corresponding biasing devices 285 and 287 define the flow rates through lines 282 and 286, respectively, and thus the corresponding rate of extension and retraction of the pad 250.
  • the fluid flow line 282 and its corresponding flow control device 285 is set such that when the drill bit 250 is not in use, i.e., there is no external force being applied onto the pad 250, the biasing member 280 will extend the pad 250 to the maximum extended position.
  • the flow control line 282 may be configured so that the biasing member 280 extends the pad 250 relatively fast or suddenly.
  • the weight on bit applied to the bit exerts an external force on the pad 250. This external force causes the pad 250 to apply a force or pressure on the piston 280 and thus on the biasing member 284.
  • the fluid flow line 286 may be configured to allow relatively slow flow rate of the fluid from chamber 272 into chamber or reservoir 274, thereby causing the pad to retract relatively slowly.
  • the extension rate of the pad 250 may be set so that the pad 250 extends from the fully retracted position to a fully extended position over a few seconds while it retracts from the fully extended position to the fully retracted position over one or several minutes or longer (such as between 2-5 minutes). It will be noted, that any suitable rate may be set for the extension and retraction of the pad 250.
  • the device 260 is a passive device that adjusts the extension and retraction of a pad based on or in response to the force or pressure applied on the pad 250.
  • the pads 250 are wear resistant elements, such as cutters, ovoids, elements making rolling contact, or other elements that reduce friction with earth formations. In certain embodiments, pads 250 are directly in front and in the same cutting groove as the cutters 239a, 238b.
  • device 260 is oriented with a tilt against the direction of rotation to minimize the tangential component of friction force experienced by the piston 280. In certain embodiments, the device 260 is located inside the blades 234a, 234b, etc. supported by the bit body 201 with a press fit near the face 232a of the bit 200 and a threaded cap or retainer or a snap ring near the top end of the side portion 234a, 234b.
  • FIG. 3 shows an alternative rate control device 300.
  • the device 300 includes a fluid chamber 370 divided by a double acting piston 380 into a first chamber 372 and a second chamber or reservoir 374.
  • the chambers 372 and 374 are filled with a hydraulic fluid 378.
  • a first fluid flow line 382 and an associated flow control device 385 allow the fluid 378 to flow from chamber 374 to chamber 372 at a first flow rate and a fluid flow line 386 and an associated flow control device 387 allow the fluid 378 to flow from the chamber 372 to chamber 374 at a second rate.
  • the piston 380 is connected to a force transfer device 390 that includes a piston 392 in a chamber 394.
  • the chamber 394 contains a hydraulic fluid 395, which is in fluid communication with a pad 350.
  • the pad 350 may be placed in a chamber 352, which chamber is in fluid communication with the fluid 395 in chamber 394.
  • the biasing device 384 moves the piston 380 outward, it moves the piston 392 outward and into the chamber 394.
  • Piston 392 expels fluid 395 from chamber 394 into the chamber 352, which extends the pad 350.
  • a force is applied on to the pad 350, it pushes the fluid in chamber 352 into chamber 394, which applies a force onto the piston 380.
  • the rate of the movement of the piston 380 is controlled by the flow of the fluid through the fluid flow line 386 and flow control device 387. In the particular configuration shown in FIG.
  • the rate control device 300 is not directly connected to the pad 350, which enables isolation of the device 300 from the pad 350 and allows it to be located at any desired location in the drill bit, as described in reference to FIGS. 5-6 .
  • the pad 350 may be directly connected to a cutter 399 or an end of the pad 350 may be made as a cutter. In this configuration, the cutter 399 acts both as a cutter and an extendable and a retractable pad.
  • FIG. 4 shows a common rate control device 400 configured to operate more than one pad, such as pads 350a, 350b ... 350n.
  • the rate control device 400 is the same as shown and described in FIG. 2 , except that it is shown to apply force onto the pads 350a, 350b ... 350n via an intermediate device 390, as shown and described in reference to FIG. 3 .
  • each of the pads 350a, 350b ... 350n is housed in separate chambers 352a, 352b ... 352n respectively.
  • the fluid 395 from chamber 394 is supplied to all chambers, thereby automatically and simultaneously extending and retracting each of the pads 350a, 350b ... 350n based on external forces applied to each such pad during drilling.
  • the rate control device 400 may include a suitable pressure compensator 499 for downhole use.
  • any of the rate controllers made according to any of the embodiments may employ a suitable pressure compensator.
  • FIG. 5 shows an isometric view of a drill bit 500, wherein a rate control device 560 is placed in a crown section 530 of the drill bit 500.
  • the rate control device 560 is the same as shown in FIG. 2 , but is coupled to a pad 550 via a hydraulic connection 540 and a fluid line 542.
  • the rate control device 560 is shown placed in a recess 580 accessible from an outside surface 582 of the crown section 530.
  • the pad 550 is shown placed at a face location section 552 on the drill bit face 532, while the hydraulic connection 540 is shown placed in the crown 530 between the pad 550 and the rate control device 560.
  • rate control device 560 may be placed at any desired location in the drill bit, including in the shank 520 and neck section 510 and the hydraulic line 542 may be routed in any desired manner from the rate control device 560 to the pad 550. Such a configuration provides flexibility of placing the rate control device substantially anywhere in the drill bit.
  • FIG. 6 shows an isometric view of a drill bit 600, wherein a rate control device 660 is placed in a fluid passage 625 of the drill bit 600.
  • the hydraulic connection 640 is placed proximate the rate control device 660.
  • a hydraulic line 670 is run from the hydraulic connection 640 to the pad 650 through the shank 620 and the crown 630 of the drill bit 600.
  • a drilling fluid flows through the passage 625.
  • the rate control device 660 may be provided with a through bore or passage 655 and the hydraulic connection device 640 may be provided with a flow passage 645.
  • FIG. 7 shows a drill bit 700, wherein an integrated pad and rate control device 750 is placed on an outside surface of the drill bit 700.
  • the device 750 includes a rate control device 760 connected to a pad 755.
  • the device 750 is a sealed unit that may be attached to any outside surface of the drill bit 700.
  • the pad is shown connected to a side 720a of a blade 720 of the drill bit 700.
  • the device 750 may be attached or placed at any other suitable location in the drill bit 700.
  • the device 750 may be integrated into a blade so that the pad will extend toward a desired direction from the drill bit.
  • FIG. 8A shows an integrated rate control device 800.
  • rate control devices 800 are individual self-contained cartridges to be disposed inside the blades of a bit, such as the bits previously described.
  • rate control functionality is achieved through a pressure management device, such as multi-stage orifice 899.
  • FIG. 8B shows the multi-stage orifice 899 with a plurality of orifices 898 that provide a tortuous path for fluid 878 between upper chamber 872 and lower chamber 874.
  • upper chamber 872 is subject to a higher pressure than lower chamber 874.
  • lower chamber 874 is close to downhole pressure.
  • multistage orifice 899 controls the movement and pressure within rate control device 800 in conjunction with biasing member 884, by controlling the flow of fluid 878 therein. Accordingly, the rate of pad 850 is effectively controlled by adjusting the properties of the orifice 899.
  • the lower chamber 874 is pressure-compensated. In an exemplary embodiment, the lower chamber 874 is pressure compensated with downhole pressure to minimize the pressure differential across the mud-oil seal 875 at the bit face.
  • FIG. 9 shows an integrated rate control device 900.
  • rate control devices 900 are self-contained cartridges disposed inside the blades of a bit, such as the bits previously described.
  • the rate control functionality is achieved through a pressure management device, such as high-precision gap 999 between the piston 980 and the cylinder 994.
  • the high-precision gap 999 allows a predetermined amount of fluid 978 to be transferred between upper chamber 972 and lower chamber 974 at a given pressure differential, effectively controlling the rate of movement of piston 980.
  • high-precision gap 999 also acts as a high-pressure seal between the two chambers 972, 974.
  • the chambers 972, 974 respectively contain a high pressure fluid and a low pressure fluid.
  • the lower chamber 974 (low pressure chamber) is pressure-compensated with downhole pressure to minimize the pressure differential across the mud-oil seal (not shown) at the bit face.
  • the pressure-compensation is achieved through bellows in communication with the downhole formation pressure.
  • FIG. 10 shows a drill bit 1000 with a rate controller 1090 located in the bit shank 1091 of the drill bit 1000.
  • rate control device 1090 is hydraulically connected to multiple pistons 1080 via hydraulic passages 1092 that allow passage of fluid 1078 therethrough to act as a linkage 1056a.
  • the central location of rate control device 1090 allows for a large space for the rate control device 1090 while allowing multiple pistons 1080 to be utilized and share load during drill bit operation.
  • the pressure drop across the bit 1000 is utilized to create the downward force.
  • the low pressure chamber 1074 is compensated to have the same pressure as the drilling fluid pressure inside the bit, while the top rod or chamber 1072 of the compensated piston 1080 is exposed to the pressure inside the bit 1000 causing a net downward force.
  • a secondary linkage 1056b is hydraulically or mechanically linked to the pad 1050.
  • FIG. 11 shows a drill bit 1100 with a rate controller 1190 centrally located in the drill bit 1100.
  • the rate control device 1190 is centrally located and mechanically or hydraulically connected to multiple pads 1150.
  • this allows for reduction in the peak pressure inside the rate controller 1190 and also reduces number of parts as the pads 1150 as centrally actuated as shown in FIG. 4 .
  • FIG. 12 shows a rate control device 1200 that utilizes a triple-walled cylinder 1298 with annular gaps 1299 between walls 1298a, 1298b, 1298c.
  • annular gap 1299 is a pressure management device, such as a high precision gap to restrict flow of fluid 1278 to control the movement of piston 1280.
  • fluid flow 1278 moves through ports 1299a and 1299b to interface with both sides of piston 1280.
  • ports 1299a and 1299b have check valves to restrict fluid flow 1278.
  • fluid 1278 is restricted by gap 1299 to control the flow of fluid 1278, resulting in the controlled movement of piston 1280.
  • a pressure compensator 1297 is utilized to compensate the pressure of lower chamber 1274 to downhole fluid pressure.
  • FIG. 13 shows a rate control device 1300 with a compensated piston 1380.
  • a double acting piston 1380 with substantially equal rod size is exposed to both upper chamber 1372 and lower chamber 1374.
  • both ends piston 1380 are exposed to the bottomhole pressure so that net force on the piston 1380 due to drilling fluid pressure is near zero.
  • a hydraulic accumulator 1399 can be used with the compensated piston 1380 to accommodate for fluid volume changes with temperature, trapped air, and leakages.
  • a biasing member 1378 is utilized to provide a downward force.
  • both chambers 1372, 1374 are compensated to minimize the pressure differential between the rate control device 1300 and the wellbore.
  • FIG. 14 shows an example of a rate control device 1400 beyond the wording of the claims that utilizes a rotary seal 1496 at the mud-oil interface when disposed within a drill bit (shown schematically as 1401).
  • a cam 1492 is located outside of the drill bit 1401 and the rotary motion is transmitted via shaft 1491 into the bit body through a rotary seal 1496.
  • the rotary motion is converted into a translational motion inside the bit body using a second cam 1493 and a follower 1494 attached to the piston 1480.
  • the first cam 1492 exposes the adaptive element 1450 attached.
  • first cam 1492 As external load is experienced by first cam 1492, the load rotates the first cam 1492, and in turn the second cam 1493, which in turn causes inward motion (hiding) of the piston 1480.
  • the piston 1480 extends due to the spring 1484 force, and in turn rotates the cams 1492, 1493 and exposes the adaptive elements 1450.
  • the contact element 1450 is extended (exposed) and retracted (hidden) at different rates controlled by cam 1492, 1493 profile and biasing member 1484 characteristics.
  • FIG. 15 shows a rate control device 1500 that utilizes a fixed pressure management device 1599.
  • pressure management device 1599 is stationary relative to moving piston 1580.
  • downhole fluid pressure 1575 is exerted upon separator 1597 to compensate the pressure of reservoir 1574.
  • Fluid 1587 may flow between fluid chamber 1572 and reservoir 1574 via pressure management device 1599.
  • the chamber 1572 and reservoir 1574 are in fluid communication with each other via a first fluid flow path or flow line 1582 and a second fluid flow path or flow line 1586.
  • a flow control device, such as a check valve 1585, placed in the fluid flow line 1582, may be utilized to control the rate of flow of the fluid from reservoir 1574 to chamber 1572.
  • another flow control device such as a check valve 1587, placed in fluid flow line 1586, may be utilized to control the rate of flow of the fluid 1578 from chamber 1572 to reservoir 1574.
  • the flow control devices 1585 and 1587 may be configured at the surface to set the rates of flow through fluid flow lines 1582 and 1586, respectively.
  • the pressure exerted from downhole fluid 1575 biases the piston 1580 downward.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
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  • General Life Sciences & Earth Sciences (AREA)
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Claims (10)

  1. Bohrloch-Drehbohrwerkzeug, umfassend:
    einen Werkzeugkörper (201);
    ein ausfahrbares und einfahrbares Element (250), das dem Werkzeugkörper (201) zugeordnet ist und zumindest teilweise von einer Oberfläche (252) des Werkzeugkörpers (201) vorsteht;
    eine selbsteinstellende Geschwindigkeitssteuervorrichtung (260), die mit dem Element (250) gekoppelt ist, wobei die selbsteinstellende Geschwindigkeitssteuervorrichtung (260) konfiguriert ist, um zu bewirken, dass das Element (250) von einer eingefahrenen Position in eine ausgefahrene Position mit einer ersten Geschwindigkeit in Abwesenheit einer externen Kraft, die auf das Element (250) ausgeübt wird, in Bezug auf den Werkzeugkörper (201) nach außen ausfährt, wobei die selbsteinstellende Geschwindigkeitssteuervorrichtung (260) Folgendes einschließt:
    einen Kolben (280) zum Ausüben einer Kraft auf das Element (250);
    ein Vorspannelement (284), das eine Kraft auf den Kolben (280) ausübt, um das Element (250) auszufahren;
    eine Fluidkammer (270), die dem Kolben (280) zugeordnet ist, wobei der Kolben (280) die Kammer (270) abdichtend in eine erste Kammer (272) und eine zweite Kammer (274) unterteilt, wobei die erste Kammer (272) und die zweite Kammer (274) mit Hydraulikfluid (278) gefüllt sind, das zur Verwendung in einem Bohrloch geeignet ist,
    und dadurch gekennzeichnet, dass
    die selbsteinstellende Geschwindigkeitssteuervorrichtung (260) konfiguriert ist, um zu bewirken, dass das Element (250) von der ausgefahrenen Position in die eingefahrene Position mit einer zweiten Geschwindigkeit, die sich von der ersten Geschwindigkeit unterscheidet, in Reaktion auf eine externe Kraft, die auf das Element (250) ausgeübt wird, in Bezug auf den Werkzeugkörper (201) nach innen einfährt, und
    wobei die erste Kammer (272) und die zweite Kammer (274) über einen ersten Fluidströmungspfad (282) miteinander in Fluidverbindung stehen, der eine erste Fluidsteuervorrichtung (285) in dem ersten Fluidströmungspfad (282) aufweist, die konfiguriert ist, die Strömungsgeschwindigkeit des Hydraulikfluids (278) von der zweiten Kammer (274) zu der ersten Kammer (272) zu steuern, und wobei die erste Kammer (272) und die zweite Kammer (274) über einen zweiten Fluidströmungspfad (286) miteinander in Fluidverbindung stehen, der eine zweite Fluidsteuervorrichtung (287) in dem zweiten Fluidströmungspfad (286) aufweist, die konfiguriert ist, die Strömungsgeschwindigkeit des Hydraulikfluids (278) von der ersten Kammer (272) zu der zweiten Kammer (274) zu steuern.
  2. Bohrwerkzeug nach Anspruch 1, wobei die zweite Geschwindigkeit kleiner ist als die erste Geschwindigkeit.
  3. Bohrwerkzeug nach Anspruch 1, wobei der Kolben ein Kolben einer Vielzahl von hydraulisch verbundenen Kolben ist.
  4. Bohrwerkzeug nach Anspruch 1, wobei das Element eine Auflage oder ein Schneidelement ist.
  5. Bohrwerkzeug nach Anspruch 1, wobei die selbsteinstellende Geschwindigkeitssteuervorrichtung in einem Winkel in Bezug auf eine Richtung der beabsichtigten Drehung des Bohrwerkzeugs ausgerichtet ist, um eine Tangentialkomponente einer Reibungskraft, falls vorhanden, die der Kolben erfährt, zu verringern.
  6. Verfahren zum Bohren eines Bohrlochs, umfassend:
    Integrieren eines Bohrwerkzeugs in einen Bohrstrang (118), wobei das Bohrwerkzeug einen Werkzeugkörper (201), ein ausfahrbares und einfahrbares Element (250), das dem Werkzeugkörper (201) zugeordnet ist und zumindest teilweise von einer Oberfläche (252) des Werkzeugkörpers (201) vorsteht, und eine selbsteinstellende Geschwindigkeitssteuervorrichtung (260) umfasst, wobei die selbsteinstellende Geschwindigkeitssteuervorrichtung (260) einen Kolben (280) zum Ausüben einer Kraft auf das Element (250), ein Vorspannelement (280), das eine Kraft auf den Kolben (280) ausübt, um das Element (250) auszufahren, eine Fluidkammer (270), die dem Kolben (280) zugeordnet ist, umfasst, wobei der Kolben (280) die Kammer (270) abdichtend in eine erste Kammer (272) und eine zweite Kammer (274) unterteilt, wobei die erste Kammer (272) und die zweite Kammer (274) mit Hydraulikfluid (278) gefüllt sind, dadurch gekennzeichnet, dass die erste Kammer (272) und die zweite Kammer (274) über einen ersten Fluidströmungspfad (282) miteinander in Verbindung stehen, der eine erste Fluidsteuervorrichtung (285) in dem ersten Fluidströmungspfad (282) aufweist, die konfiguriert ist, die Strömungsgeschwindigkeit des Hydraulikfluids (278) von der zweiten Kammer (274) zu der ersten Kammer (272) zu steuern, und wobei die erste Kammer (272) und die zweite Kammer (274) über einen zweiten Fluidströmungspfad (286) miteinander in Verbindung stehen, der eine zweite Fluidsteuervorrichtung (287) in dem zweiten Fluidströmungspfad (286) aufweist, die konfiguriert ist, die Strömungsgeschwindigkeit des Hydraulikfluids (278) von der ersten Kammer (272) zu der zweiten Kammer (274) zu steuern;
    Befördern des Bohrstrangs (118) in eine Formation;
    Ermöglichen eines Ausfahrens des Elements (250) in Bezug auf den Werkzeugkörper (201) nach außen aus einer eingefahrenen Position in eine ausgefahrene Position unter der ausgeübten Kraft des Vorspannelements (284) auf den Kolben (280) mit einer ersten Geschwindigkeit, die durch die Strömungsgeschwindigkeit von Hydraulikfluid aus der zweiten Kammer (274) in die erste Kammer (272) gesteuert wird;
    Ermöglichen des Einfahrens des Elements (250) aus der ausgefahrenen Position in die eingefahrene Position als Reaktion auf eine externe Kraft, die auf das Element (250) durch die Formation entgegen der ausgeübten Kraft des Vorspannelements (284) mit einer zweiten Geschwindigkeit ausgeübt wird, die sich von der ersten Geschwindigkeit unterscheidet und durch die Strömungsgeschwindigkeit von Hydraulikfluid aus der ersten Kammer (272) in die zweite Kammer (274) gesteuert wird; und
    Bohren des Bohrlochs unter Verwendung des Bohrstrangs (118).
  7. Verfahren nach Anspruch 6, ferner umfassend das Verringern von Vibrationen in dem Bohrstrang unter Verwendung des ausfahrbaren und einfahrbaren Elements.
  8. Verfahren nach Anspruch 6, ferner umfassend das Einstellen der Manövrierbarkeit des Bohrwerkzeugs unter Verwendung des ausfahrbaren und einfahrbaren Elements.
  9. Verfahren nach Anspruch 6, wobei die zweite Geschwindigkeit geringer ist als die erste Geschwindigkeit.
  10. Verfahren nach Anspruch 6, wobei der Kolben ein Kolben einer Vielzahl von hydraulisch verbundenen Kolben ist.
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US14/516,340 US9708859B2 (en) 2013-04-17 2014-10-16 Drill bit with self-adjusting pads
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CA2964366A1 (en) 2016-04-21
CA2964366C (en) 2019-07-02

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