WO2022033609A2 - 短半径钻井工具 - Google Patents
短半径钻井工具 Download PDFInfo
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- WO2022033609A2 WO2022033609A2 PCT/CN2021/123138 CN2021123138W WO2022033609A2 WO 2022033609 A2 WO2022033609 A2 WO 2022033609A2 CN 2021123138 W CN2021123138 W CN 2021123138W WO 2022033609 A2 WO2022033609 A2 WO 2022033609A2
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- WIPO (PCT)
- Prior art keywords
- short
- driving
- drilling tool
- control circuit
- drive
- Prior art date
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- 238000005553 drilling Methods 0.000 title claims abstract description 91
- 230000005540 biological transmission Effects 0.000 claims abstract description 47
- 230000007246 mechanism Effects 0.000 claims abstract description 43
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- 238000004891 communication Methods 0.000 claims description 3
- 239000000696 magnetic material Substances 0.000 claims description 3
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- 238000005516 engineering process Methods 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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Classifications
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- 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
- E21B7/061—Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock
Definitions
- the invention relates to the technical field of drilling, in particular to a short-radius drilling tool.
- the purpose of the present invention is to provide a short-radius drilling tool with short steering structure and capable of realizing directional drilling of short-extremely short-radius wellbore or directional drilling of extended well sections through short-extremely short-radius wellbore.
- the present invention provides a short radius drilling tool, comprising:
- a steered drilling sub-section which includes a drill bit and a guiding sub-section
- the guiding sub-section includes a bearing body, the bearing body is provided with a deflection guide mechanism and an electric drive actuator, and the drill bit is connected to the lower end of the bearing body , the deflection guide mechanism can drive the drill bit to deflect in a preset direction;
- the driving drill string includes a plurality of bearing short joints connected in sequence from top to bottom, the bearing short joint at the bottom is connected with the bearing body, and between two adjacent bearing short joints and the Both the bearing short joint and the bearing body are hingedly connected by the WOB torque deflection transmission mechanism;
- a drive control sub which is provided with an electric drive actuator drive control circuit, the electric drive actuator drive control circuit is electrically connected to the electric drive actuator through a jumper line, and the drive control sub is connected to the guide Between the drilling sub and the driving drill string, or the driving control sub is connected to any position in the driving drill string, or the driving control sub is connected to the upper end of the driving drill string.
- the short-radius drilling tool of the present invention is provided with a deflection and steering mechanism, so that the deflection and steering mechanism can drive the drill bit to deflect in a preset direction under the condition of rotation, so as to change the wellbore trajectory, so as to realize short-very short radius directional drilling or through any
- the short-very short radius well section completes the directional drilling of its extended well section; by arranging the drive control circuit of the electric drive actuator, which contains a large number of power devices and requires heat dissipation space, in the drive control sub-section behind the bearing body, the steering is short. Only the deflection guide mechanism and electric drive actuator are retained in the section, which effectively shortens the length of the guide sub section and makes it easier to realize the orientation function in the wellbore with high curvature.
- electric drive actuators are selected to drive hydraulic cylinders to distribute drilling circulating medium in the through-flow channel, so as to realize steering in a specific direction, which can save the amount of energy required for the steering process to the greatest extent, and can greatly reduce the volume of mechanical structures and circuits. important role.
- the strapdown attitude measurement module can realize the attitude measurement of the short-radius drilling tool without relying on the inertial platform, which eliminates the large space occupied by the inertial platform and the hidden dangers. This facilitates miniaturization of the short radius drilling tool carrying body or carrying sub.
- both the guide control circuit and the electric drive actuator drive control circuit being arranged inside the electric drive actuator drive control sub-section is that the guide control circuit can control the switch tube driver through the PWM signal more quickly and agilely, Further, the switch tube is driven by the switch tube driver to realize the control of the electric drive actuator, which greatly reduces the possible interference in the control link.
- Fig. 1 is the first structural representation of the short-radius drilling tool of the present invention
- Fig. 2 is the second kind of structural representation of the short-radius drilling tool of the present invention.
- Fig. 3 is the third structural representation of the short-radius drilling tool of the present invention.
- Fig. 4 is the enlarged structure schematic diagram of A part in Fig. 3;
- Fig. 5 is the schematic diagram when the short radius drilling tool of the present invention is in the working state
- FIG. 6 is a schematic cross-sectional structure diagram of a drive control sub.
- the downhole tools that can provide drilling in a rotating state have rotary steering technology, and the general rotary steerable deflection ability is about 6°/30 meters.
- the shortest radius directional steering system currently used by Schlumberger can only reach 15 °/30m, up to 18°/30m in small boreholes.
- the radius of build-up curvature is generally required to be between 10 meters and 60 meters.
- the radius of build-up curvature is generally required to be within 10 meters.
- the present invention provides a short radius drilling tool, which can achieve short-ultrashort radius wellbore 300 drilling, and/or, through A short-ultra-short radius wellbore 300 completes the drilling of its extended wellbore 300, the short radius drilling tool includes a steerable drilling sub 100, a drive drill string 200, and a drive control sub 280, wherein:
- the steerable drilling sub-section 100 includes a steerable sub-section 120 and a drill bit 110.
- the steerable sub-section 120 includes a bearing body 121, the bearing body 121 is cylindrical, and the length of the bearing body 121 is less than 1.5 meters, so as to be suitable for the wellbore of the ultra-short radius branch well 300 curvature, the bearing body 121 is provided with a deflection guide mechanism 130 and an electric drive actuator 140 for performing a guiding function, the drill bit 110 is connected to the lower end of the bearing body 121, and the deflection guide mechanism 130 can drive the drill bit 110 to deflect in a preset direction to Drive the drill bit 110 to deflect under the condition of rotation, thereby changing the trajectory of the wellbore 300, thereby realizing a short build-up slope;
- the driving drill string 200 includes a plurality of load-bearing sub-sections 210 connected in sequence from top to bottom.
- the length of the load-bearing sub-sections 210 is less than 1.2 meters, located at
- the lowermost short bearing joint 210 is connected to the bearing body 121 , and between two adjacent bearing short joints 210 and between the bearing short joint 210 and the bearing body 121 are hinged through the drilling pressure torque deflection transmission mechanism 220 , that is, the driving drill.
- the column 200 has a hinged structure, and the WOB torque deflection transmission mechanism 220 can transmit the power of the rotary drilling and propel and drive the drill string 200;
- the drive control sub 280 may be hinged with the guide sub 120 and the lowermost carrying sub 210 through the WOB torque deflection transmission mechanism 220, respectively, or the drive control sub 280 may be connected to the WOB torque deflection transmission mechanism 220. Between any two adjacent bearing sub-sections 210, or, the driving control sub-section 280 can be connected to the upper end of the driving drill string 200 through the weight-on-bit torque deflection transmission mechanism 220, that is, the electric drive actuator driving control circuit 230 is disposed on the bearing body 121 It is suitable for accommodating the electric drive actuator drive control circuit with high space requirements and high heat dissipation requirements, and such an arrangement is not only conducive to reducing the length of the carrying body 121 to the maximum extent, so as to improve the short The passability of the radius drilling tool is also conducive to damping the drive control circuit of the electric drive actuator.
- the length of the drive control sub-section 280 is less than 1.5 meters; the drive control sub-section 280 is provided with an electric drive actuator to drive
- the control circuit 230, the electric drive actuator drive control circuit 230 is electrically connected to the electric drive actuator 140 through the jumper line 240, and the jumper line 240 can cross the weight-on-bit torque deflection transmission mechanism 220, so that the electric drive provided in the bearing body 121 is electrically connected.
- the drive actuator 140 is electrically connected to the electric drive actuator drive control circuit 230 disposed in the carrying short section 210 .
- a pressure-bearing structure is provided inside the drive control sub-section 280 , and a sealed chamber is generally formed by the pressure-bearing body 281 and the pressure-bearing sleeve 282 , and the electric drive actuator drives the control circuit 230 is arranged in the sealed compartment.
- the deflection steering mechanism 130 can drive the drill bit 110 to deflect in a preset direction under the condition of rotation, so as to change the trajectory of the wellbore 300, thereby realizing a short build-up rate;
- the electric drive actuator drive control circuit 230 containing a large number of power devices and requiring heat dissipation space is arranged in the drive control sub-section 280 behind the carrier body 121, so that only the deflection guide mechanism 130 and the electric drive actuator 140 remain in the guide sub-section 120, As a result, the length of the guide sub-section 120 is effectively shortened, so that it is easier to realize the directional function in the high-curvature wellbore 300 .
- the deflection guide mechanism 130 includes at least three groups of driving hydraulic cylinders 131 arranged at intervals along the circumferential direction of the bearing body 121 , preferably, the driving hydraulic cylinders 131 are arranged at equal intervals,
- the driving hydraulic cylinder 131 includes a piston cylinder 1311 connected to the cylindrical wall of the bearing body 121 and a driving piston 1312 arranged in the piston cylinder 1311.
- the driving piston 1312 can move along the radial direction of the bearing body 121, and the driving piston 1312 can abut against In the wellbore, the drill bit 110 is deflected in a preset direction by the telescopic actuation of the driving piston 1312.
- each driving piston 1312 by adjusting the telescopic amount of each driving piston 1312, the thrust exerted by each driving piston 1312 on the wellbore wall can be adjusted, and the wellbore will pass the driving piston 1312.
- the reaction force acts on the bearing body 121 , so that the bearing body 121 drives the drill bit 110 to deflect a certain angle relative to the well wall, thereby changing the trajectory of the wellbore 300 .
- the driving hydraulic cylinder 131 the purpose and significance of using the driving hydraulic cylinder 131 is that the hydraulic force can be pushed against the well wall with a relatively flexible and relatively constant pressure, and it can run stably within a certain range of wellbore curvature without being stuck.
- the shapes of the driving piston 1312 and the piston cylinder 1311 are not necessarily standard cylindrical shapes, and the driving piston 1312 may be a piston structure, a plunger structure and any equivalent alternatives; the driving piston 1312 and A metal seal, rubber seal or O-ring seal can be used between the piston cylinders 1311 to facilitate the telescopic function of the driving piston 1312. shape, square or slot shape, etc.
- a pushing member 1313 is connected to the driving piston 1312 , and the driving piston 1312 abuts against the well wall through the pushing member 1313 .
- the short radius drilling tool further includes a strapdown attitude measurement module 270 and a steering control circuit 250.
- the strapdown attitude measurement module 270 is fixedly arranged in the short radius drilling tool.
- the strapdown attitude measurement The module 270 is fixedly arranged on the carrying body 121, and is used to measure the gravity tool face angle and/or the magnetic tool face angle of the short radius controllable trajectory drilling tool downhole.
- the steering control circuit 250 is electrically connected to the strapdown attitude measurement module 270 and the electric drive actuator drive control circuit 230, and the steering control circuit 250 controls the electric drive according to the measured gravitational tool face angle and/or magnetic tool face angle
- the actuator 140 executes the command action, and further drives the deflection guide mechanism 130 to drive the drill bit 110 to deflect toward the guide direction.
- the deflection guide mechanism 130 is fixedly arranged on the bearing body 121 , and the bearing body 121 is respectively fixedly connected with the drill bit 110 and the driving drill string 200 , so that the driving drill string 200 can transmit the weight-on-bit torque through the bearing body 121 of the steering short joint 120
- the deflection steering mechanism 130 is fully rotated with the driving drill string 200, so as to better clean the wellbore 300 and prevent dragging the WOB, so that the short-radius drilling tool can realize the steering function under the full rotation condition.
- the electric drive actuator drive control circuit 230 at least includes a switch tube bearing circuit board 231 arranged in a ring shape and a switch tube driver bearing circuit board 232 arranged in a ring shape, the switch tube bearing circuit board 231 and the switch tube driver carrying circuit board 232 are both arranged in the cylindrical carrying short section 210, the switch tube carrying circuit board 231 is provided with a switch tube, and the switch tube driver carrying circuit board 232 is provided with a switch tube driver, and the switch tube Electrically connected to the switch driver, such a structure can compress the axial length of the electric drive actuator drive control circuit 230 to the shortest, so as to improve the passability of the short bearing section 210 .
- the switch tube is used to drive the stator coil of the motor to generate a sine wave or square wave to drive the motor to rotate; when the electric drive actuator 140 is an electromagnet, the switch tube is used to drive the electromagnet The current conduction state of the coil.
- the short-radius drilling tool further includes a steering control circuit 250.
- the steering control circuit 250 is electrically connected to the electric drive actuator drive control circuit 230, and the steering control circuit 250 is used to drive the control circuit 230 through the electric drive actuator.
- the electric drive actuator 140 is driven to work so that the piston cylinder 1311 in the sector facing away from the guide direction is brought into contact with the high pressure fluid in the inner flow channel of the carrier body 121 of the guide sub 120 .
- the short-radius drilling device further includes a power supply sub-section 260, and the power supply sub-section 260 is connected in series to any position in the driving drill string 200, or the power supply sub-section 260 is connected to the upper end of the driving drill string 200, The power sub 260 is used to power the short radius drilling tool.
- the strapdown attitude measurement module 270 is fixedly connected to the carrying body 121, and the strapdown attitude measurement module 270 includes at least one accelerometer, the accelerometer measures the well inclination, and the The included angle between the installation direction and the axial direction of the bearing body 121 is between 0° and 60°.
- the strapdown attitude measurement module 270 also includes at least one magnetometer, the magnetometer is used to measure the magnetic azimuth angle near the drill bit 110, and the bearing body 121 is a bearing body 121 made of a non-magnetic material to avoid the magnetic force interference.
- the drill bit 110 is a drill bit 110 made of non-magnetic material, which can better avoid interference to the magnetometer.
- At least one of the switch tube driver carrying circuit board 232 , the guidance control circuit 250 and the strapdown attitude measurement module 270 is manufactured by a thick film circuit process to minimize the occupied space and minimize the location of each circuit. Bearing the axial length of the short section 210, the purpose of maximizing the passability of the short-radius drilling tool is achieved.
- the weight-on-bit torque deflection transmission mechanism 220 includes a transmission universal joint 221 and a fixed sleeve 222 sleeved on the outside of the transmission universal joint 221, and there is a gap between the fixed sleeve 222 and the transmission universal joint 221 to form a deflection space,
- the transmission universal joint 221 can be deflected by 0° to 15° relative to the axis of the fixed sleeve 222 in the deflection space.
- the fixed sleeve 222 limits the deflection angle of the transmission universal joint 221, which can prevent the pressure-on-bit torque deflection transmission mechanism 220 from drilling Excessive buckling in the process of pressure torque transmission hinders the WOB torque transmission, so that the WOB torque can be transmitted smoothly.
- the transmission universal joint 221 is provided with a through structure, and a flow pipe 223 for circulating the drilling circulating medium is arranged in the through structure.
- the transmission universal joint 221 may be a cross shaft universal joint capable of transmitting axial force, or may be a combination of any universal joint and a spherical joint.
- a transmission lever 111 is coaxially connected to the upper end of the drill bit 110 .
- the transmission lever 111 is cylindrical, and the transmission lever 111 penetrates through the interior of the bearing body 121 .
- the transmission lever 111 and the drill bit 110 One-piece structure, or, the transmission lever 111 is welded and connected to the upper end of the drill bit 110 , the transmission lever 111 is connected to the lower part of the bearing body 121 through the controllable universal joint 112 , and a movable joint is formed between the transmission lever 111 and the bearing body 121 clearance, the deflection guide mechanism 130 is arranged in the movable clearance and is located above the controllable universal joint 112, the driving piston 1312 can abut with the well wall through the transmission lever 111, and the expansion and contraction of the driving piston 1312 can drive the transmission lever 111 around the controllable universal joint. Rotate toward the center of the segment 112, thereby driving the drill bit 110 to deflect in a preset direction to achieve
- the length of the upper lever arm of the transmission lever 111 is at least 30% of the distance between the controllable universal joint 112 and the weight-on-bit torque deflection transmission mechanism 220 adjacent above it, so as to make full use of the space extension of the bearing body 121
- the upper lever arm enables the drill bit 110 to obtain as much steering force as possible;
- the length of the lower lever arm of the transmission lever 111 is less than 50% of the distance between the controllable universal joint 112 and the weight-on-bit torque deflection transmission mechanism 220 adjacent to it, so as to reduce the torque or vibration of the drill bit 110 to the transmission lever 111 as much as possible. interference, in order to maximize the stability of the guiding process.
- the length c of the upper lever arm of the transmission lever 111 is the distance from the controllable universal joint 112 to the point where the deflection guide mechanism 130 applies force to the transmission lever, and the length b of the lower lever arm is the distance between the lower end face of the drill bit 110 and the controllable universal joint 112 the distance.
- the distance d between the deflection guide mechanism 130 and the upper end of the drill bit 110 is at least 50% of the distance a between the upper end of the drill bit 110 and the adjacent controllable universal joint 112 above it, so that the bearing body 121 can move toward the drill bit. 110 to apply sufficient lateral force.
- the driving hydraulic cylinder 131 is disposed below the weight-on-bit torque deflection transmission mechanism 220 connected to the bearing body 121 , and the distance between the driving hydraulic cylinder 131 and the drill bit 110 is smaller than the distance between the driving hydraulic cylinder 131 and the bearing The distance between the weight-on-bit torque deflection transmission mechanisms 220 connected to the main body 121, so that the action point of the pushing force is closer to the drill bit 110 and away from the turning point, so as to drive the drill bit 110 to deflect in the guiding direction;
- the electric drive actuator 140 includes a rotary valve 141 and a driving motor 142.
- the carrying body 121 is provided with a through flow channel 1211.
- the rotary valve 141 can make the through flow channel 1211 communicate with the driving hydraulic cylinder 131 periodically, so that the driving piston 1312 can As the drill string rotates against the well wall periodically, the reaction force of the well wall on the bearing body 121 of the steering sub 120 toward the preset steering direction is obtained, thereby driving the drill bit 110 to deflect in the steering direction, and the driving motor 142 and the electric drive
- the actuator drive control circuit 230 is electrically connected, and the operation of the motor is controlled by the electric drive actuator drive control circuit 230;
- the rotary valve 141 includes a rotary valve rotor 1411 and a rotary valve stator 1412, the rotary valve stator 1412 is fixedly connected with the bearing body 121, and the rotary valve stator 1412 is provided with a plurality of valve positions corresponding to the driving hydraulic cylinders 131 one-to-one, and the driving
- the motor 142 includes a driving motor rotor 1421 and a driving motor stator 1422, the driving motor stator 1422 is fixedly connected with the bearing body 121, the rotary valve rotor 1411 and the driving motor rotor 1421 are coupled to each other, and the driving motor rotor 1421 can drive the rotary valve rotor 1411 to rotate the valve relative to each other.
- the stator 1412 rotates so that each valve position on the rotary valve stator 1412 periodically supplies high-pressure drilling fluid to the corresponding driving hydraulic cylinders 131 , so that the driving piston 1312 periodically generates thrust.
- the preset steering direction may be preset before the tool goes into the well or preset through the pressure change or flow change of the mud during the drilling process to transmit the signal;
- Through the through flow channel 1211 of the carrying body 121 it enters the drill bit 110 and then flows into the annulus.
- the drill bit 110 or the flow channel between the drill bit 110 and the rotary valve 141 is provided with a nozzle or other throttling device 1212 that can generate a throttling pressure drop.
- a pressure drop will be generated, and the pressure drop is the working pressure difference of the driving hydraulic cylinder 131 .
- the periodic communication means that the communication between the through flow channel and the driving hydraulic cylinder changes periodically with the rotation of the short-radius drilling tool, so as to ensure that the driving hydraulic cylinder in a specific sector obtains hydraulic pressure to drive the hydraulic cylinder.
- the transmission lever drives the drill bit to deflect toward the guiding direction.
- the mutual coupling refers to a connection method that can ensure the synchronous rotation of the rotor of the driving motor and the rotor of the rotary valve, including but not limited to plugging.
- the driving hydraulic cylinder 131 is arranged below the weight-on-bit torque deflection transmission mechanism 220 connected to the bearing body 121 , and the distance between the setting position of the driving hydraulic cylinder 131 and the drill bit 110 is smaller than that of the driving hydraulic cylinder 131 The distance to the weight-on-bit torque deflection transmission mechanism 220 connected with the bearing body 121, so that the action point of the pushing force is closer to the drill bit 110 and away from the turning point, so as to drive the drill bit 110 to deflect in the guiding direction;
- the electric drive actuator 140 includes a rotary valve 141 and a driving motor 142 , the carrying body 121 is provided with a through flow channel 1211 , the rotary valve 141 can be periodically communicated with the driving hydraulic cylinder 131 through the through flow channel 1211 , and the driving motor 142 is connected to the electric drive
- the actuator drive control circuit 230 is electrically connected;
- the electrically-driven actuator 140 includes a plurality of solenoid valves 143 corresponding to each driving hydraulic cylinder 131 one-to-one, each solenoid valve 143 is electrically connected to the electrically-driven actuator drive control circuit 230, and the solenoid valve 143 is a two-position two-way solenoid
- the valve 143, the solenoid valve 143 has a first passage 1431 and a second passage 1432, the first passage 1431 is communicated with the driving hydraulic cylinder 131, and the second passage 1432 is communicated with the through flow passage 1211.
- the solenoid valve 143 can connect the flow passage to the driving hydraulic cylinder 131.
- the hydraulic cylinder 131 communicates periodically.
- the electric drive actuator 140 controls the circuit to open the passage of the two-position two-way valve corresponding to the drive hydraulic cylinder 131 in the opposite sector to the guiding direction, so that the high-pressure fluid in the water hole passes through.
- the solenoid valve 143 flows into the piston cylinder 1311 through the through flow channel 1211, causing a large pressure difference between the inside and outside of the driving hydraulic cylinder 131, and then pushing the driving piston 1312 against the well wall to generate a guiding thrust; correspondingly, with The two-position two-way valve corresponding to the driving hydraulic cylinder 131 in the area where the steering direction is located is in a closed state, and the drilling fluid of the driving hydraulic cylinder 131 in the area where the steering direction is located is discharged from the piston through the throttle device 1212 without generating thrust, so the water With the rotation of the drill string, the drilling fluid in the hole is periodically distributed to each driving hydraulic cylinder 131 by the solenoid valve 143 under the control of the electric driving actuator 140 control circuit, and each driving hydraulic cylinder 131
- the preset method of the preset steering direction may be preset before the tool goes downhole or preset through the downlink signal of the pressure change or flow change of the mud during the drilling process; use a motor or other methods to independently drive the valve to achieve the first
- the opening/closing between the passage 1431 and the second passage 1432 belongs to the equivalent replacement of the solenoid valve 143 of the present invention, and falls within the protection scope of the present invention.
- the short-radius drilling tool of the present invention is provided with a deflection and steering mechanism, so that the deflection and steering mechanism can drive the drill bit to deflect in a preset direction under the condition of rotation, so as to change the wellbore trajectory, thereby realizing a short build-up rate;
- the electric drive actuator drive control circuit which contains a large number of power devices and requires heat dissipation space, is arranged in the drive control sub-section behind the carrier body, so that only the deflection guide mechanism and electric drive actuator remain in the guide sub-section, thereby effectively shortening the guide
- the length of the sub section makes it easier to implement the directional function in the high curvature wellbore.
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Abstract
本发明提供了一种短半径钻井工具，其包括导向钻进短节、驱动钻柱和驱动控制短节，导向钻进短节包括导向短节和钻头，导向短节包括承载本体，承载本体上设置有偏转导向机构和电驱动执行器，钻头与承载本体相接，偏转导向机构能驱动钻头按预设方向偏转；驱动钻柱包括多个由上至下依次连接的承载短节，位于最下方的承载短节与承载本体相接，且相邻两承载短节之间以及承载短节与承载本体之间均通过钻压扭矩偏转传递机构相铰接，驱动控制短节设有电驱动执行器驱动控制电路，电驱动执行器驱动控制电路通过跨接线路与电驱动执行器电连接。本发明能够实现短造斜率，且有效缩短了导向短节的长度，进而更容易在高曲率井眼里实现定向钻井功能。
Description
相关申请
本申请要求专利申请号为202011358655.8、申请日为2020.11.27、发明名称为“短半径钻井工具”的中国发明专利的优先权，同时要求申请号为202010797032.4、申请日为2020.08.10、发明名称为“短半径可控轨迹钻井工具”的中国发明专利的优先权。
本发明涉及钻井技术领域，尤其是一种短半径钻井工具。
很多油气藏、或者需要流化开采的固体矿藏的开发需要大量用到钻井技术，甚至于水平井钻探技术。由于现有的定向钻井技术无法实现短半径转向，难于开发超薄储层；或在盖层中难于造斜但进入储层后又需要大曲率转向的定向井；或尽可能大限度的实现分支钻井；或在浅部地层实现大角度转弯，或通过在已有井眼中侧钻分支井以实现井旁储量的动用。现有技术中，通常采用带有弯接头的螺杆钻具钻分支井的方式实现井旁储量的动用。已有资料表明，现有的螺杆钻具定向钻井技术以及其他定向钻井技术无法超过15°/30米的造斜率。
综上所述，井眼曲率太大，现有的可控轨迹的定向井技术无法实现；井眼曲率太小，导致造斜段太长，处于转弯状态的井段会产生大量的无效进尺，经济效益差且增加了施工井段的作业难度。
发明内容
本发明的目的是提供一种导向结构短小且能实现短-极短半径井眼定向钻进或通过短-极短半径井眼实现其延伸井段定向钻进的短半径钻井工具。
本发明的上述目的可采用下列技术方案来实现：
本发明提供一种短半径钻井工具，包括：
导向钻进短节，其包括钻头和导向短节，所述导向短节包括承载本体，所述承载本体上设置有偏转导向机构和电驱动执行器，所述钻头连接于所述承载本体的下端，所述 偏转导向机构能驱动所述钻头按预设方向偏转；
驱动钻柱，其包括多个由上至下依次连接的承载短节，位于最下方的所述承载短节与所述承载本体相接，且相邻两所述承载短节之间以及所述承载短节与所述承载本体之间均通过钻压扭矩偏转传递机构相铰接；
驱动控制短节，其设有电驱动执行器驱动控制电路，所述电驱动执行器驱动控制电路通过跨接线路与所述电驱动执行器电连接，所述驱动控制短节连接于所述导向钻进短节与所述驱动钻柱之间，或者，所述驱动控制短节连接于所述驱动钻柱中任意位置，或者，所述驱动控制短节连接于所述驱动钻柱的上端。
本发明的特点及优点是：
本发明的短半径钻井工具，通过设置偏转导向机构，使得在旋转的条件下偏转导向机构能驱动钻头按预设方向偏转，以改变井眼轨迹，从而实现短-极短半径定向钻井或通过所述短-极短半径井段完成其延伸井段的定向钻探；通过将含有大量功率器件且需要散热空间的电驱动执行器驱动控制电路设置于承载本体后方的驱动控制短节内，使得导向短节内仅保留偏转导向机构和电驱动执行器，从而有效缩短了导向短节的长度，进而更容易在高曲率井眼里实现定向功能。
本发明选用电驱动执行器为驱动液压缸分配贯通流道中钻井循环介质，以实现向特定方向的导向，可以最大限度的节约导向过程所需额能量，对缩小机械结构和电路的体积起到至关重要的作用。
所述捷联式姿态测量模块可以不依赖惯性平台实现所述短半径钻井工具的姿态测量，消除了惯性平台占用的大量空间和带来的隐患。有助于所述短半径钻井工具承载本体或承载短节的小型化。
所述导向控制电路与所述电驱动执行器驱动控制电路均设置于所述电驱动执行器驱动控制短节的内部的好处在于，使导向控制电路可以更加迅速敏捷通过PWM信号控制开关管驱动器，进一步的通过开关管驱动器驱动开关管实现对电驱动执行器的控制，大幅度降低了控制链路中的可能发生的干扰。
以下附图仅旨在于对本发明做示意性说明和解释，并不限定本发明的范围。其中：
图1是本发明的短半径钻井工具的第一种结构示意图；
图2是本发明的短半径钻井工具的第二种结构示意图；
图3是本发明的短半径钻井工具的第三种结构示意图；
图4是图3中的A部放大结构示意图；
图5是本发明的短半径钻井工具处于工作状态时的示意图；
图6是驱动控制短节的截面结构示意图。
为了对本发明的技术特征、目的和效果有更加清楚的理解，现对照附图说明本发明的具体实施方式。在本发明的描述中，除非另有说明，“多个”的含义是两个或两个以上。需要说明的是，在文中描述的“前方”和“后方”指的是沿钻进方向的前方和后方。
目前，可在旋转状态下提供钻井的井下工具有旋转导向技术，一般的旋转导向造斜能力在6°/30米左右，目前使用的斯伦贝谢公司的最短半径定向导向系统仅能达到15°/30米，在小井眼中最多也不超过18°/30米。然而在短-超短半径钻井领域中，造斜曲率半径要求一般在10米～60米之间，在超短半径钻井领域中，造斜曲率半径要求一般在10米以内。由于目前使用的旋转导向系统先天性的无法被弯折，几乎不可能适应短半径钻井实际需求，并且无法在旋转钻井条件下实现转弯半径在60米以内的短-超短半径定向钻井。现有技术中的其他有关产品也均存在无法在旋转钻井条件下实现井眼轨迹控制的功能，导致严重的拖钻压问题。
为了解决上述问题，如图1、图2、图3和图5所示，本发明提供了一种短半径钻井工具，其能实现短-超短半径井眼300钻进，和/或，通过短-超短半径井眼300完成其延伸井眼300的钻探，该短半径钻井工具包括导向钻进短节100、驱动钻柱200和驱动控制短节280，其中：
导向钻进短节100包括导向短节120和钻头110，导向短节120包括承载本体121，承载本体121呈筒状，承载本体121的长度小于1.5米，以适用超短半径分支井的井眼300曲率，承载本体121上设置有用于执行导向功能的偏转导向机构130和电驱动执行器140，钻头110连接于承载本体121的下端，偏转导向机构130能驱动钻头110按预设方向偏转，以在旋转的条件下驱动钻头110偏转，从而改变井眼300轨迹，进而实现短造斜率；
驱动钻柱200包括多个由上至下依次连接的承载短节210，为了更好的适用超短半径分支井的井眼300曲率，较佳的，承载短节210的长度小于1.2米，位于最下方的承载短节210与承载本体121相接，且相邻两承载短节210之间以及承载短节210与承载 本体121之间均通过钻压扭矩偏转传递机构220相铰接，即驱动钻柱200呈铰链式结构，钻压扭矩偏转传递机构220能够传递旋转钻井的动力以及推进驱动钻柱200；
驱动控制短节280可以通过钻压扭矩偏转传递机构220分别与导向短节120和位于最下方的承载短节210相铰接，或者，驱动控制短节280可以通过钻压扭矩偏转传递机构220连接于任意相邻两承载短节210之间，或者，驱动控制短节280可以通过钻压扭矩偏转传递机构220连接于驱动钻柱200的上端，即电驱动执行器驱动控制电路230设置于承载本体121的后方，以适用于容置对空间需求较大以及对散热要求较高的电驱动执行器驱动控制电路，并且这样的排布方式，既有利于承载本体121最大限度的缩减长度，以提高短半径钻井工具的通过性，又有利于对电驱动执行器驱动控制电路进行减震，较佳的，驱动控制短节280的长度小于1.5米；驱动控制短节280上设有电驱动执行器驱动控制电路230，电驱动执行器驱动控制电路230通过跨接线路240与电驱动执行器140电连接，跨接线路240能跨越钻压扭矩偏转传递机构220，以使设置于承载本体121中的电驱动执行器140与设置于承载短节210中的电驱动执行器驱动控制电路230实现电连接。
需要说明的是，如图6所示，驱动控制短节280内部设置有承压结构，一般是由承压本体281和承压套筒282构形成密封舱室，所述电驱动执行器驱动控制电路230设置于所述密封舱室内。
本发明的短半径钻井工具，通过设置偏转导向机构130，使得在旋转的条件下偏转导向机构130能驱动钻头110按预设方向偏转，以改变井眼300轨迹，从而实现短造斜率；通过将含有大量功率器件且需要散热空间的电驱动执行器驱动控制电路230设置于承载本体121后方的驱动控制短节280内，使得导向短节120内仅保留偏转导向机构130和电驱动执行器140，从而有效缩短了导向短节120的长度，进而更容易在高曲率井眼300里实现定向功能。
进一步，如图1、图2和图3所示，偏转导向机构130包括至少三组沿承载本体121的周向间隔设置的驱动液压缸131，较佳的，各驱动液压缸131等间隔设置，驱动液压缸131包括连接于承载本体121的筒壁上的活塞缸1311和设置于活塞缸1311内的驱动活塞1312，驱动活塞1312能沿承载本体121的径向移动，且驱动活塞1312能抵靠井壁，通过驱动活塞1312的伸缩驱动钻头110按预设方向偏转，具体的，通过调节各驱动活塞1312的伸缩量，能够调整各驱动活塞1312向井壁施加的推力，井壁会通过驱动活塞1312将反作用力作用于承载本体121上，以使承载本体121带动钻头110相对于井壁偏 转一定角度，从而改变井眼300轨迹。
需要说明的是，采用驱动液压缸131的目的和意义在于，液压力可以以柔性的较为恒定压力推靠井壁，在一定的井眼曲率范围内都可以稳定运行并不至于被卡住。此外，由于井下仪器设计受到空间的限制，因此，驱动活塞1312和活塞缸1311的形状不一定是标准的圆柱形状，驱动活塞1312可以是活塞结构、柱塞结构及任意同等替代；驱动活塞1312和活塞缸1311之间可以采用金属密封、橡胶件密封或O型圈密封等任意有助于驱动活塞1312伸缩功能的密封方式；活塞缸1311和驱动活塞1312的截面形状相适配，其可以是圆形、方形或槽口形等。
进一步，驱动活塞1312上连接有推靠件1313，驱动活塞1312通过推靠件1313与井壁抵接。
进一步，所述短半径钻井工具还包括捷联式姿态测量模块270和导向控制电路250，捷联式姿态测量模块270固定设置于所述短半径钻井工具中，一般而言，捷联式姿态测量模块270固定设置于所述承载本体121，用于在井下测量所述短半径可控轨迹钻井工具的重力工具面角和/或磁工具面角。导向控制电路250与捷联式姿态测量模块270和电驱动执行器驱动控制电路230电连接，所述导向控制电路250根据所述测得的重力工具面角和/或磁工具面角控制电驱动执行器140执行指令动作，进一步驱动偏转导向机构130带动钻头110向导向方向偏转。
进一步，偏转导向机构130固定设置于承载本体121上，承载本体121分别与钻头110和驱动钻柱200固定连接，以使驱动钻柱200可将钻压扭矩经由导向短节120的承载本体121传递给钻头110，使偏转导向机构130随驱动钻柱200全旋转，以便更好的清洁井眼300、防止拖钻压，从而使得短半径钻井工具在全旋转条件下实现导向功能。
进一步，如图6所示，电驱动执行器驱动控制电路230至少包括呈环状排布的开关管承载电路板231和呈环状排布的开关管驱动器承载电路板232，开关管承载电路板231和开关管驱动器承载电路板232均设置于呈筒状的承载短节210内，开关管承载电路板231上设有开关管，开关管驱动器承载电路板232上设有开关管驱动器，开关管与开关驱动器电连接，这样的结构，能够将电驱动执行器驱动控制电路230的轴向长度压缩至最短，以提高该承载短节210的通过性。
需要说明的是，当电驱动执行器140为电动机时，则开关管用于驱动电动机定子线圈产生正弦波或方波以驱动电动机旋转；当电驱动执行器为电磁铁时，开关管用于驱动电磁铁线圈的电流导通状态。
进一步，如图6所示，短半径钻井工具还包括导向控制电路250，导向控制电路250与电驱动执行器驱动控制电路230电连接，导向控制电路250用于通过电驱动执行器驱动控制电路230驱动电驱动执行器140工作，以使背对导向方向的扇区内的活塞缸1311与导向短节120的承载本体121内部流道中的高压流体接触。
再进一步，如图3所示，短半径钻井装置还包括电源短节260，电源短节260串接于驱动钻柱200中任意位置，或者，电源短节260连接于驱动钻柱200的上端，电源短节260用于为短半径钻井工具供电。
进一步，如图2和图3所示，捷联式姿态测量模块270固定连接于承载本体121上，捷联式姿态测量模块270包括至少一只加速度计，加速度计测量井斜角，加速度计的安装方向与承载本体121的轴线方向的夹角在0～60°之间。
进一步，捷联式姿态测量模块270还包括至少一只磁力计，磁力计用于测量近钻头110处的磁方位角，承载本体121为采用无磁材质制成的承载本体121，以避免对磁力计的干扰。
需要说明的是，钻头110为采用无磁材质制成的钻头110，可以更好的避免对磁力计的干扰。
进一步，开关管驱动器承载电路板232、导向控制电路250和捷联式姿态测量模块270中的至少一个采用厚膜电路工艺制造，以最大限度减小占用的空间，从而最大限度的缩小各个电路所在承载短节210的轴向长度，达到最大限度提高所述短半径钻井工具通过性的目的。
进一步，钻压扭矩偏转传递机构220包括传递万向节221和套设于传递万向节221的外部的固定套筒222，固定套筒222与传递万向节221之间具有间隙形成偏转空间，传递万向节221能在偏转空间内相对固定套筒222的轴线偏转0°～15°，通过固定套筒222限制传递万向节221的偏转角度，能够防止钻压扭矩偏转传递机构220在钻压扭矩传递过程中过度屈曲，妨碍钻压扭矩传递，从而使得钻压扭矩能够顺利传递。
再进一步，传递万向节221设有贯通结构，贯通结构内设有用于流通钻井循环介质的流管223。
需要说明的是，传递万向节221可以是能传递轴向力的十字轴万向节，也可以是任意万向节与球铰的组合。
实施方式一
如图1所示，钻头110的上端同轴连接有传动杠杆111，具体的，传动杠杆111呈筒状，传动杠杆111穿设于承载本体121的内部，较佳的，传动杠杆111与钻头110为一体式结构，或者，传动杠杆111焊接连接于钻头110的上端，传动杠杆111通过可控万向节112与承载本体121的下部相接，且传动杠杆111与承载本体121之间形成有活动间隙，偏转导向机构130设于活动间隙内并位于可控万向节112的上方，驱动活塞1312能通过传动杠杆111与井壁抵接，驱动活塞1312的伸缩能驱动传动杠杆111绕可控万向节112的中心转动，从而带动钻头110按预设方向偏转，以实现导向；
需要说明的是，传动杠杆111的上力臂长度至少为可控万向节112至其上方邻近的钻压扭矩偏转传递机构220之间间距的30％，以能充分利用承载本体121的空间延长上力臂，使钻头110可以获得尽可能多的导向力；
传动杠杆111的下力臂长度小于可控万向节112至其上方邻近的钻压扭矩偏转传递机构220之间间距的50％，以尽可能减缓钻头110扭矩或振动给传动杠杆111带来的干扰，以求最大限度的加强导向过程的稳定性。
其中，传动杠杆111的上力臂长度c为可控万向节112至偏转导向机构130向传动杠杆的施力点的距离，下力臂长度b为钻头110下端面到可控万向节112间的距离。
进一步，偏转导向机构130与钻头110的上端之间的距离d至少为钻头110的上端至其上方邻近的可控万向节112之间的距离a的50％，以使得承载本体121能够向钻头110施加足够的侧向力。
实施方式二
如图2所示，驱动液压缸131设置于与承载本体121相接的钻压扭矩偏转传递机构220的下方，且驱动液压缸131的设置位置到钻头110的距离小于驱动液压缸131到与承载本体121相接的钻压扭矩偏转传递机构220间的距离，以使推靠力的作用点更接近于钻头110而远离转向点，从而驱使钻头110向导向方向偏转；
电驱动执行器140包括转阀141和驱动电机142，承载本体121上设有贯通流道1211，转阀141能使贯通流道1211与驱动液压缸131周期性相连通，以使驱动活塞1312可以随钻柱旋转周期性的抵靠井壁，从而获得井壁对导向短节120的承载本体121的朝向预设导向方向的反作用力，进而驱使钻头110向导向方向偏转，驱动电机142与电驱动执行器驱动控制电路230电连接，通过电驱动执行器驱动控制电路230控制电机的工作；
进一步，转阀141包括转阀转子1411和转阀定子1412，转阀定子1412与承载本体 121固定连接，转阀定子1412设置有多个分别与各驱动液压缸131一一对应的阀位，驱动电机142包括驱动电机转子1421和驱动电机定子1422，驱动电机定子1422与承载本体121固定连接，转阀转子1411与驱动电机转子1421相互耦接，驱动电机转子1421能驱动转阀转子1411相对转阀定子1412旋转，使转阀定子1412上的各阀位向对应的各驱动液压缸131周期性供应高压钻井液，以使驱动活塞1312周期性产生推力。
需要说明的是，预设导向方向的预设方式可以是工具下井前预设或钻井过程中通过泥浆的压力变化或者流量变化下传信号进行预设；来自于钻柱水眼中的钻井液经过流经承载本体121的贯通流道1211进入钻头110内部继而流入环空，钻头110内部或钻头110与转阀141之间的流道中设置有喷嘴或其他可以产生节流压降的节流装置1212，钻井液流经喷嘴或节流结构时，会产生压降，压降即为驱动液压缸131的工作压差，其产生压差的具体过程和原理为本领域常识，此处不在赘述。所述周期性联通指所述贯通流道与所述驱动液压缸的联通性随所述短半径钻井工具的旋转而周期改变，以保证处于特定扇区的驱动液压缸得到液压力，用以驱动所述传动杠杆带动钻头向导向方向偏转。所述相互耦接是指能保证驱动电机转子和转阀转子同步旋转的连接方式，包括但不限于插接。
实施方式三
如图3和图4所示，驱动液压缸131设置于与承载本体121相接的钻压扭矩偏转传递机构220的下方，且驱动液压缸131的设置位置到钻头110的距离小于驱动液压缸131到与承载本体121相接的钻压扭矩偏转传递机构220间的距离，以使推靠力的作用点更接近于钻头110而远离转向点，从而驱使钻头110向导向方向偏转；
电驱动执行器140包括转阀141和驱动电机142，承载本体121上设有贯通流道1211，转阀141能通过贯通流道1211与驱动液压缸131周期性相连通，驱动电机142与电驱动执行器驱动控制电路230电连接；
进一步，电驱动执行器140包括多个分别与各驱动液压缸131一一对应的电磁阀143，各电磁阀143与电驱动执行器驱动控制电路230电连接，电磁阀143为二位二通电磁阀143，电磁阀143具有第一通路1431和第二通路1432，第一通路1431与驱动液压缸131相连通，第二通路1432与贯通流道1211相连通，电磁阀143能将流道与驱动液压缸131周期性连通，具体的，电驱动执行器140控制电路打开处于与导向方向相反扇区内的驱动液压缸131所对应的二位二通阀的通路，使水眼内的高压流体通过电磁阀143并经过 贯通流道1211流进所述活塞缸1311内，使所述驱动液压缸131的内外产生较大压差，进而通过驱动活塞1312推靠井壁产生导向推力；对应的，与处于导向方向所在区的驱动液压缸131对应的二位二通阀处于关闭状态，处于导向方向所在区的驱动液压缸131的钻井液经过节流装置1212排出活塞，不产生推力，故所述水眼内钻井液随着钻柱的旋转被电磁阀143在电驱动执行器140控制电路的控制下周期性的分配给各个驱动液压缸131，各个驱动液压缸131分别沿其径向推靠井壁产生的合力使钻头110发生偏转，以达到改变井眼300轨迹的目的。
需要说明的是，预设导向方向的预设方式可以是工具下井前预设或钻井过程中通过泥浆的压力变化或者流量变化下传信号进行预设；使用电动机或其他方式独立驱动阀实现第一通路1431和第二通路1432之间的开/闭，均属于本发明所述的电磁阀143的同等替换，均在本发明的保护范围内。
综上所述，本发明的短半径钻井工具，通过设置偏转导向机构，使得在旋转的条件下偏转导向机构能驱动钻头按预设方向偏转，以改变井眼轨迹，从而实现短造斜率；通过将含有大量功率器件且需要散热空间的电驱动执行器驱动控制电路设置于承载本体后方的驱动控制短节内，使得导向短节内仅保留偏转导向机构和电驱动执行器，从而有效缩短了导向短节的长度，进而更容易在高曲率井眼里实现定向功能。
以上所述仅为本发明示意性的具体实施方式，并非用以限定本发明的范围。任何本领域的技术人员，在不脱离本发明的构思和原则的前提下所作的等同变化与修改，均应属于本发明保护的范围。
Claims (14)
- 一种短半径钻井工具，其中，所述短半径钻井工具包括：导向钻进短节，其包括钻头和导向短节，所述导向短节包括承载本体，所述承载本体上设置有偏转导向机构和电驱动执行器，所述钻头连接于所述承载本体的下端，所述偏转导向机构能驱动所述钻头按预设方向偏转；驱动钻柱，其包括多个由上至下依次连接的承载短节，位于最下方的所述承载短节与所述承载本体相接，且相邻两所述承载短节之间以及所述承载短节与所述承载本体之间均通过钻压扭矩偏转传递机构相铰接；驱动控制短节，其设有电驱动执行器驱动控制电路，所述电驱动执行器驱动控制电路通过跨接线路与所述电驱动执行器电连接，所述驱动控制短节连接于所述导向钻进短节与所述驱动钻柱之间，或者，所述驱动控制短节连接于所述驱动钻柱中任意位置，或者，所述驱动控制短节连接于所述驱动钻柱的上端。
- 如权利要求1所述的短半径钻井工具，其中，所述偏转导向机构包括至少一组沿所述承载本体的周向间隔设置的驱动液压缸，所述驱动液压缸包括连接于所述承载本体的筒壁上的活塞缸和设置于所述活塞缸内的驱动活塞，所述驱动活塞能抵靠井壁，通过所述驱动活塞的伸缩驱动所述钻头按预设方向偏转。
- 如权利要求1所述的短半径钻井工具，其中，所述电驱动执行器驱动控制电路至少包括呈环状排布的开关管承载电路板和呈环状排布的开关管驱动器承载电路板，所述开关管承载电路板上设有开关管，所述开关管驱动器承载电路板上设有开关管驱动器，所述开关管与所述开关管驱动器电连接。
- 如权利要求1所述的短半径钻井工具，其中，所述短半径钻井工具还包括捷联式姿态测量模块和导向控制电路，所述捷联式姿态测量模块固定设置于所述短半径钻井工具中，所述捷联式姿态测量模块能在井下测量所述短半径可控轨迹钻井工具的井斜角和/或重力工具面角和/或磁工具面角；所述导向控制电路与所述捷联式姿态测量模块和所述电驱动执行器驱动控制电路电连接，所述导向控制电路能根据所述捷联式姿态测量模块的检测数据控制所述电驱动执行器执行指令动作。
- 如权利要求2所述的短半径钻井工具，其中，所述钻头的上端同轴连接有传动杠杆，所述传动杠杆通过可控万向节与所述承载本体的下部相接，且所述传动杠杆与所述承载本体之间形成有活动间隙，所述偏转导向机构设于所述活动间隙内并位于所述可控万向节的上方，所述驱动活塞能通过所述传动杠杆与所述井壁抵接，所述驱动活塞的伸 缩能驱动所述传动杠杆绕所述可控万向节的中心转动，所述传动杠杆的转动能带动所述钻头按预设方向偏转。
- 如权利要求2所述的短半径钻井工具，其中，所述电驱动执行器包括转阀和驱动电机，所述承载本体上设有贯通流道，所述转阀能使所述贯通流道与所述驱动液压缸周期性相连通，所述驱动电机与所述电驱动执行器驱动控制电路电连接。
- 如权利要求6所述的短半径钻井工具，其中，所述转阀包括转阀转子和转阀定子，所述转阀定子与所述承载本体固定连接，所述转阀定子设置有多个分别与各所述驱动液压缸一一对应的阀位，所述驱动电机包括驱动电机转子和驱动电机定子，所述驱动电机定子与所述承载本体固定连接；所述转阀转子与所述驱动电机转子相互耦接，所述驱动电机转子能驱动所述转阀转子相对所述转阀定子旋转。
- 如权利要求2所述的短半径钻井工具，其中，所述承载本体上设有贯通流道，所述电驱动执行器包括多个分别与各所述驱动液压缸一一对应的电磁阀，各所述电磁阀与所述电驱动执行器驱动控制电路电连接，所述电磁阀具有第一通路和第二通路，所述第一通路与所述驱动液压缸相连通，所述第二通路与所述贯通流道相连通，所述电磁阀能将所述贯通流道与所述驱动液压缸周期性连通。
- 如权利要求4所述的短半径钻井工具，其中，所述导向控制电路固定设置于所述驱动控制短节内部，且所述导向控制电路在所述驱动控制短节内部与所述电驱动执行器驱动控制电路电连接。
- 如权利要求4或9所述的短半径钻井工具，其中，所述导向控制电路为采用厚膜电路工艺制造的导向控制电路。
- 如权利要求1所述的短半径钻井工具，其中，所述短半径钻井工具还包括电源短节，所述电源短节串接于所述驱动钻柱中任意位置，或者，所述电源短节连接于所述驱动钻柱的上端。
- 如权利要求4所述的短半径钻井工具，其中，所述捷联式姿态测量模块固定连接于所述承载本体上，所述捷联式姿态测量模块包括至少一只加速度计。
- 如权利要求12所述的短半径钻井工具，其中，所述捷联式姿态测量模块还包括至少一只磁力计，所述承载本体为采用无磁材质制成的承载本体。
- 如权利要求12所述的短半径钻井工具，其中，所述捷联式姿态测量模块为采用厚膜电路工艺制造的捷联式姿态测量模块。
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| CN112267831A (zh) | 2021-01-26 |
| CN112267830A (zh) | 2021-01-26 |
| WO2022033609A3 (zh) | 2022-04-07 |
| CN213597871U (zh) | 2021-07-02 |
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