Geological drilling hole bottom power cutting device and method

Abstract

The invention relates to a geological drilling hole bottom power cutting device and method, and belongs to the technical field of geological drilling. According to the technical scheme, a first pushing sliding block and a second pushing sliding block of a fixing module move inwards, the first pushing sliding block and the second pushing sliding block push an anchoring block outwards, the anchoring block stretches out of a fixing shell to make contact with the pipe wall of the drill pipe and is tensioned, and fixing of the cutting device is achieved; a rotating shell of the rotating module rotates, a cutting motor rotates at the same time, and a tool bit gradually extends outwards until the tool bit makes contact with the inner wall of the drill rod to start cutting; after cutting is completed, the fixing module acts reversely, the anchoring block retracts, and the cutting device is taken out; the hole bottom signal transmission module is used for controlling the fixing module, the rotating module and the hole bottom cutting module and transmitting signals. The drill rod cutting tool has the beneficial effects that stable rotation of the tool bit is guaranteed through stable positioning, a drill rod or a casing pipe is smoothly cut off, the drill rod or the casing pipe is effectively cut off in a drilled hole, positioning in the drill rod is firm, cutting is stable, and the working efficiency of cutting off the drill rod is improved.

Description

Technical Field

[0001] The present invention relates to a downhole power cutting device and method for geological drilling, belonging to the technical field of geological drilling. Background Art

[0002] In geological drilling, when the drill pipe or casing gets stuck in the hole and cannot be retrieved, a pipe cutting device is used to cut the drill pipe or casing in the hole to retrieve the remaining pipe and reduce losses. The commonly used pipe cutting devices in the prior art usually use a surface drill rig connected to the drill pipe as the power, and a pipe cutting device is connected to the lower end of the drill pipe in the hole for cutting. The biggest drawback of this method is that due to the transmission of power from the surface, the long drill pipe string has a complex running state in the hole, driving the pipe cutting device to have an unstable movement state in the hole. It usually does not move along the axis of the drill pipe, that is, the movement center of the pipe cutting device does not coincide with the center of the borehole, resulting in the cutting tool head colliding back and forth and being damaged, and the cutting fails. In addition, there are many problems with the positioning and cutting of the pipe cutting device in the drill pipe in the prior art. For example, in the Chinese invention patent application CN202310787971.4 named "A downhole power cutting device for accident drill pipes with wireline coring in the hole", an expansion rubber ring is used for fixed positioning, and the positioning is not firm; a return spring is used to push out the cutting blade, and the cutting is unstable, affecting the operation efficiency of cutting the drill pipe. Summary of the Invention

[0003] The purpose of the present invention is to provide a downhole power cutting device and method for geological drilling, which can ensure the stable rotation of the tool head through stable positioning, smoothly cut the drill pipe or casing, effectively cut the drill pipe or casing in the borehole of the drill hole, have firm positioning in the drill pipe, stable cutting, improve the operation efficiency of cutting the drill pipe, and solve the above technical problems existing in the background art.

[0004] The technical solution of the present invention is as follows: A downhole dynamic cutting device for geological drilling, comprising a rotating module and a downhole cutting module. The downhole cutting module is located below the rotating module. The rotating module includes a rotating motor, a power distribution slip ring, and a rotating housing. The rotating motor is connected to the rotating housing through the power distribution slip ring. The inner and outer rings of the power distribution slip ring can rotate independently to achieve the independent rotation of the rotating housing. The downhole cutting module includes a cutting motor, a rotating device II, a drive shaft, a spiral slider, a cutting housing, and a cutter head. The cutting motor is fixed inside the rotating housing. A cutting housing is provided at the bottom of the rotating housing. A cutter head hole is provided on the barrel wall of the cutting housing, and the cutter head extends out from the cutter head hole of the cutting housing. The cutting motor is connected to the drive shaft through the rotating device II. The drive shaft is located inside the cutting housing. Two spiral sliders are arranged on the drive shaft. The spiral slider is a cylinder, and a plurality of spiral grooves are arranged on the axial section of the spiral slider. The spiral groove is an Archimedean spiral groove. The two spiral sliders are respectively arranged on both sides of the cutter head, and a plurality of cutter heads are arranged between the two spiral sliders. The number of cutter heads is the same as the number of spiral grooves. The cutter head is composed of a cutter body and a sliding shaft. Sliding shafts are respectively provided on the upper and lower sides of the cutter body. The sliding shafts on the upper and lower sides of each cutter head respectively match the spiral grooves at the same position of the two spiral sliders. The cutter head can extend out or retract in the cutter head hole of the cutting housing as the sliding shaft slides along the spiral groove. The cutting motor, the rotating device II, the drive shaft, the spiral slider, the cutting housing, and the cutter head rotate together with the rotating housing.

[0005] Further, the rotating module is located below the fixed module. The fixed module includes a fixed drive motor, a rotating device I, a positive and negative lead screw mechanism, a pushing slider I, an anchoring block, and a pushing slider II. The fixed drive motor is connected to the positive and negative lead screw mechanism through the rotating device I. The positive and negative lead screw mechanism is a transmission pair formed by a positive and negative lead screw, a positive lead screw nut, and a negative lead screw nut. A pushing slider II is provided on the positive lead screw nut, and a pushing slider I is provided on the negative lead screw nut. An anchoring block is provided between the pushing slider I and the pushing slider II. The anchoring block is in sliding contact with the pushing slider I and the pushing slider II respectively through an inclined surface dovetail groove structure. The positive and negative lead screw is a positive and negative trapezoidal lead screw. By rotating the positive and negative lead screw, the positive lead screw nut and the negative lead screw nut move towards or away from each other, and drive the pushing slider I and the pushing slider II to move towards or away from each other, so as to realize the extension and retraction of the anchoring block located between the pushing slider I and the pushing slider II.

[0006] Further, the fixed module is arranged below the downhole signal transmission module. The downhole signal transmission module is connected to the fixed module, the rotating module, and the downhole cutting module and transmits signals.

[0007] Further, the first pushing slider and the second pushing slider are of a hollow shaft structure, and the positive and reverse lead screws pass through them; the inclined surface dovetail groove structure is a dovetail groove structure provided on the inclined surface. Dovetail grooves are provided on the inclined surfaces at the ends of the first pushing slider and the second pushing slider, respectively, and are correspondingly matched with the dovetails on the upper and lower inclined surfaces of the anchoring block.

[0008] Further, diamond anti-sliding blocks are provided on the outer side surface of the anchoring block, which play a good fixing role after contacting the drill pipe wall.

[0009] Further, the positive lead screw nut and the first pushing slider, as well as the reverse lead screw nut and the second pushing slider, are connected together by screws.

[0010] Further, a driving motor housing is provided outside the fixed driving motor.

[0011] Further, the number of the anchoring blocks is four, which are evenly distributed around the positive and reverse lead screws; a fixed housing is provided outside the positive and reverse lead screw mechanism. The fixed housing is of a hollow tube structure, and four square long grooves are provided on the tube wall of the fixed housing. The four anchoring blocks are respectively arranged in the corresponding square long grooves.

[0012] Further, when the positive and reverse lead screws rotate clockwise, they drive the positive and reverse lead screw nuts to move inward, and the first pushing slider and the second pushing slider move inward. The corresponding inclined surface dovetail grooves push the anchoring blocks outward. The anchoring blocks extend out of the fixed housing to contact and tension the drill pipe wall, realizing the fixation of the cutting device. Because the trapezoidal lead screw has good self-locking characteristics, the fixing device can also be fixed when the motor is turned off at this time.

[0013] Further, when the positive and reverse lead screws rotate counterclockwise, they drive the positive and reverse lead screw nuts to move outward, and the first pushing slider and the second pushing slider move outward. The corresponding inclined surface dovetail groove structure pulls the anchoring blocks inward. The anchoring blocks are separated from the drill pipe wall and retracted into the fixed housing. The displacement control signal of the fixed driving motor can control the anchoring blocks to return to their original positions.

[0014] Further, drive shaft holes are provided at the centers of the two spiral sliders, and the drive shaft is connected to the two spiral sliders through the drive shaft holes; key grooves are provided on the drive shaft holes of the two spiral sliders, and the mounting keys on the drive shaft are correspondingly arranged in the key grooves.

[0015] Further, the cutter head includes a cuboid cutter body. Cutting edges are arranged at the outer ends of the cutter body. Sliding shafts are arranged on both the upper and lower sides of the cutter body. Controlling the positions of the sliding shafts on both the upper and lower sides of the cutter body in the corresponding spiral grooves can further control the length of the cutter body extending out of the cutter head hole of the cutting housing.

[0016] Further, the starting radius of the spiral groove is small and the ending radius is large. When the spiral slider rotates, the sliding shaft of the cutter head slides from the starting point to the ending point of the spiral groove, and the cutter head also extends from the low point to the high point accordingly, completing the cutting of the drill pipe wall.

[0017] Further, the distribution slip ring is a well-known slip ring mechanism in the art, also known as a rotary electrical interface or an electrical rotary joint.

[0018] A bottom-hole dynamic cutting method for geological drilling uses the above cutting device and includes the following steps: transporting the cutting device to the corresponding cutting position inside the drill pipe, starting the fixed driving motor of the fixing module, pushing slider one and slider two inward, pushing slider one and slider two to push the anchoring block outward, and the anchoring block extends out to contact and tension with the drill pipe wall to achieve the fixation of the cutting device; starting the rotating motor of the rotating module, the rotating housing rotates, the cutting motor rotates simultaneously, the cutting motor drives the driving shaft to rotate, the driving shaft drives the spiral slider to rotate, and the cutter head is pushed from the low end to the high end of the spiral groove, and the cutter head gradually extends outward until it contacts the inner wall of the drill pipe and starts cutting. The power for rotary cutting is provided by the rotating motor driving the rotation of the rotating housing; after cutting is completed, the fixing module operates in reverse, the anchoring block retracts, and the cutting device is taken out; the bottom-hole signal transmission module is used to control the fixing module, the rotating module, and the bottom-hole cutting module and transmit signals.

[0019] The beneficial effects of the present invention: Ensure the stable rotation of the cutter head through stable positioning, smoothly cut the drill pipe or casing, effectively cut the drill pipe or casing inside the borehole, firmly position inside the drill pipe, stably cut, and improve the operation efficiency of cutting the drill pipe. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is a schematic diagram of the state of the anchoring block before anchoring in an embodiment of the present invention; Figure 3 is a schematic diagram of the state of the anchoring block after anchoring in an embodiment of the present invention; Figure 4 is a schematic diagram of the rotating module in an embodiment of the present invention; Figure 5 is a schematic diagram of the original state of the cutting module in an embodiment of the present invention; Figure 6 is a schematic diagram of the cutting state of the cutting module in an embodiment of the present invention; Figure 7 is a schematic diagram of the spiral slider in an embodiment of the present invention; Figure 8 is a schematic diagram of the cutter head in an embodiment of the present invention; Figure 9 is a schematic diagram of the anchoring block in an embodiment of the present invention; Figure 10 Schematic diagram of the cutting housing according to an embodiment of the present invention; In the figure: the hole-bottom signal transmission module 1, the fixing module 2, the rotating module 3, the hole-bottom cutting module 4, the fixed driving motor 5, the first rotating device 6, the reverse lead screw nut 7, the forward and reverse lead screw 8, the first pushing slider 9, the anchoring block 10, the second pushing slider 11, the forward lead screw nut 12, the fixed outer shell 13, the driving motor outer shell 14, the drill pipe 15, the rotating motor 16, the power distribution slip ring 17, the rotating outer shell 18, the cutting motor 19, the second rotating device 20, the driving shaft 21, the spiral slider 22, the cutting housing 23, the cutter head 24, the dovetail 25, the cutter body 26, the sliding shaft 27, the spiral groove 28, the driving shaft hole 29, the keyway 30, the cutter head hole 31. Specific embodiments

[0021] The present invention will be further described below with reference to the accompanying drawings through embodiments.

[0022] Refer to the attached Figure 1-10 , this embodiment provides a hole-bottom power cutting device for geological drilling, which includes a rotating module 3 and a hole-bottom cutting module 4. The hole-bottom cutting module 4 is located below the rotating module 3. The rotating module 3 includes a rotating motor 16, a power distribution slip ring 17 and a rotating outer shell 18. The rotating motor 16 is connected to the rotating outer shell 18 through the power distribution slip ring 17. The inner and outer rings of the power distribution slip ring 17 can rotate independently to realize the independent rotation of the rotating outer shell 18. The hole-bottom cutting module 4 includes a cutting motor 19, a second rotating device 20, a driving shaft 21, a spiral slider 22, a cutting housing 23 and a cutter head 24. The cutting motor 19 is fixed in the rotating outer shell 18. A cutting housing 23 is provided at the bottom of the rotating outer shell 18. A cutter head hole 31 is provided on the barrel wall of the cutting housing 23, and the cutter head 24 extends out from the cutter head hole 31 of the cutting housing 23. The cutting motor 19 is connected to the driving shaft 21 through the second rotating device 20. The driving shaft 21 is located in the cutting housing 23. Two spiral sliders 22 are arranged on the driving shaft 21. The spiral slider 22 is a cylinder. Three spiral grooves 28 are arranged on the axial section of the spiral slider 22. The spiral groove 28 is an Archimedean spiral groove. The two spiral sliders 22 are respectively arranged on the upper and lower sides of the cutter head 24. Three cutter heads 24 are arranged between the two spiral sliders 22. The cutter head 24 is composed of a cutter body 26 and a sliding shaft 27. Sliding shafts 27 are respectively provided on the upper and lower sides of the cutter body 26. The sliding shafts 27 on the upper and lower sides of each cutter head 24 respectively match the spiral grooves 28 at the same position of the two spiral sliders 22. The cutter head 24 can extend out or retract in the cutter head hole 31 of the cutting housing 23 as the sliding shaft 27 slides along the spiral groove 28. The cutting motor 19, the second rotating device 20, the driving shaft 21, the spiral slider 22, the cutting housing 23 and the cutter head 24 rotate together with the rotating outer shell 18.

[0023] Refer to the attached Figure 1, the rotation module 3 is located below the fixed module 2, refer to the appendix Figure 2 and 3 , the fixed module 2 includes a fixed drive motor 5, a first rotating device 6, a positive and negative lead screw mechanism, a first pushing slider 9, an anchoring block 10, and a second pushing slider 11; the fixed drive motor 5 is connected to the positive and negative lead screw mechanism through the first rotating device 6, and the positive and negative lead screw mechanism is a transmission pair formed by a positive and negative lead screw 8, a positive lead screw nut 12, and a negative lead screw nut 7. The positive lead screw nut 12 is provided with the second pushing slider 11, the negative lead screw nut 7 is provided with the first pushing slider 9, and an anchoring block 10 is arranged between the first pushing slider 9 and the second pushing slider 11. The anchoring block 10 is in sliding contact with the first pushing slider 9 and the second pushing slider 11 respectively through an inclined surface dovetail groove structure; the positive and negative lead screw 8 is a positive and negative trapezoidal lead screw. By rotating the positive and negative lead screw 8, the positive lead screw nut 12 and the negative lead screw nut 7 move towards or away from each other, and drive the first pushing slider 9 and the second pushing slider 11 to move towards or away from each other, so as to realize the extension and retraction of the anchoring block 10 located between the first pushing slider 9 and the second pushing slider 11.

[0024] Refer to the appendix Figure 1 , the fixed module 2 is arranged below the bottom-hole signal transmission module 1, and the bottom-hole signal transmission module 1 is connected to the fixed module 2, the rotation module 3, and the bottom-hole cutting module 4 and transmits signals.

[0025] Refer to the appendix Figure 2 、 3 and 9, the first pushing slider 9 and the second pushing slider 11 are hollow shaft structures, and the positive and negative lead screw 8 passes through them; the inclined surface dovetail groove structure is a dovetail groove structure arranged on the inclined surface. Dovetail grooves are arranged on the inclined surfaces at the ends of the first pushing slider 9 and the second pushing slider 11 respectively, and are correspondingly matched with the dovetails 25 on the upper and lower inclined surfaces of the anchoring block 10.

[0026] Preferably, diamond anti-sliding blocks are arranged on the outer side surface of the anchoring block 10, and the diamond anti-sliding blocks play a good fixing role after contacting the wall of the drill pipe 15.

[0027] In this embodiment, the positive lead screw nut and the first pushing slider, and the negative lead screw nut and the second pushing slider are all connected together by screws.

[0028] Preferably, a drive motor housing 14 is arranged outside the fixed drive motor 5.

[0029] In this embodiment, the number of the anchoring blocks 10 is four, which are evenly distributed around the positive and negative lead screw 8; a fixed housing 13 is arranged outside the positive and negative lead screw mechanism. The fixed housing 13 is a hollow pipe structure, and four square long grooves are arranged on the pipe wall of the fixed housing 13. The four anchoring blocks 10 are respectively arranged in the corresponding square long grooves.

[0030] When the positive and negative lead screw 8 rotates clockwise, it drives the reverse lead screw nut 7 and the positive lead screw nut 12 to move inward, pushing the first slider 9 and the second slider 11 to move inward. The corresponding inclined plane dovetail grooves on the first slider 9 and the second slider 11 push the anchoring block 10 outward. The anchoring block 10 extends out of the fixed housing 13 and contacts and tensions the pipe wall of the drill pipe 15, realizing the fixation of the cutting device. Because the trapezoidal lead screw has good self-locking characteristics, the cutting device can also be fixed by turning off the fixed drive motor 5 at this time.

[0031] When the positive and negative lead screw 8 rotates counterclockwise, it drives the reverse lead screw nut 7 and the positive lead screw nut 12 to move outward, pushing the first slider 9 and the second slider 11 to move outward. The corresponding inclined plane dovetail groove structures on the first slider 9 and the second slider 11 pull the anchoring block 10 inward. The anchoring block 10 disengages from the pipe wall of the drill pipe 15 and is retracted into the fixed housing 13. The displacement control signal of the fixed drive motor 5 can control the anchoring block 10 to return to its original position.

[0032] Refer to the appendix Figure 7 As shown, a drive shaft hole 29 is provided at the center of the two spiral sliders 22, and the drive shaft 21 is connected to the two spiral sliders 22 through the drive shaft hole 29.

[0033] Refer to the appendix Figure 7 As shown, key grooves 30 are provided on the drive shaft holes 29 of the two spiral sliders 22, and the mounting keys on the drive shaft 21 are arranged in the key grooves 30 in a matching manner. In this embodiment, the key grooves 30 of the two spiral sliders 22 are matched with the same mounting key on the drive shaft 21 to ensure that the spiral grooves on the two spiral sliders 22 correspond to each other one by one.

[0034] Refer to the appendix Figure 8 As shown, the tool bit 24 includes a cuboid tool body 26. A cutting edge is arranged at the outer end of the tool body 26. Sliding shafts 27 are arranged on both the upper and lower sides of the tool body 26. The sliding shafts 27 on both the upper and lower sides of the tool body 26 are located at the positions of the corresponding spiral grooves 28, thereby controlling the length of the tool body 26 extending out of the tool bit hole 31 of the cutting housing 23.

[0035] In this embodiment, the cutting edge of the tool bit 24 is made of alloy or diamond.

[0036] In this embodiment, the low-speed rotation speed of the tool bit 24 is 70 - 100 revolutions per minute, and the high-speed rotation speed is 400 - 500 revolutions per minute.

[0037] Preferably, the starting radius of the spiral groove 28 is small and the ending radius is large. When the spiral slider 22 rotates, the sliding shaft 27 of the tool bit 24 slides from the starting point to the ending point of the spiral groove 28, and the tool bit 24 also extends from the low point to the high point accordingly, completing the cutting of the pipe wall of the drill pipe 15.

[0038] In this embodiment, the rotation module 3 and the bottom-hole cutting module 4 adopt a constant torque working mode.

[0039] In this embodiment, the first rotating device 6 and the second rotating device 20 include bearings and shafts, which are common rotating mechanisms in the art.

[0040] In this embodiment, the fixed drive motor 5, the rotating motor 16, and the cutting motor 19 are all DC motors.

[0041] In the embodiment, there are three types of cutting devices according to different cutting pipe diameters, which are 71mm, 89mm, and 114mm. The cutting range of the 71mm diameter is 70 - 73mm, the cutting range of the 89mm diameter is 89 - 91mm, and the cutting range of the 114mm diameter is 110 - 114mm.

[0042] The distribution slip ring 17 is a well-known slip ring mechanism in the art, also known as a rotating electrical interface or an electrical rotating joint.

[0043] A method for cutting the bottom-hole power of geological drilling. The cutting device is transported to the corresponding cutting position inside the drill pipe 15. The fixed drive motor 5 of the fixing module 2 is started, pushing the first sliding block 9 and the second sliding block 11 to move inward. The first sliding block 9 and the second sliding block 11 push the anchoring block 10 outward. The anchoring block 10 extends out of the fixed housing 13 and contacts and tightens the inner wall of the drill pipe 15 to achieve the fixation of the cutting device. The rotating motor 16 of the rotation module 3 is started, the rotating housing 18 rotates, and the cutting motor 19 rotates simultaneously. The cutting motor 19 drives the drive shaft 21 to rotate. The drive shaft 21 drives the spiral sliding block 22 to rotate, pushing the cutter head 24 from the low end to the high end of the spiral groove 28. The cutter head 24 gradually extends outward until it contacts the inner wall of the drill pipe 15 and starts cutting. The power for rotary cutting is provided by the rotation of the rotating housing 18 driven by the rotating motor 16. After cutting is completed, the fixing module 2 acts in the reverse direction, the anchoring block 10 retracts, and the cutting device is taken out. The bottom-hole signal transmission module 1 is used to control the fixing module 2, the rotation module 3, and the bottom-hole cutting module 4 and transmit signals.

[0044] In the embodiment, the specific working process is as follows: ① The cutting device is connected to the computer control system on the ground by an armored cable and is transported to the cutting position inside the drill pipe 15 by a coaxial winch with the cable.

[0045] ② When reaching the cutting position, a signal is given by the computer control system, the bottom-hole signal transmission module 1 transmits the signal, the fixed drive motor 5 starts to work and rotates clockwise, the positive and negative lead screw 8 rotates clockwise accordingly, the first sliding block 9 and the second sliding block 11 generate relative movement, and the dovetail grooves on the first sliding block 9 and the second sliding block 11 cooperate with the dovetail 25 on the anchoring block 10 to push the anchoring block 10 outward until it supports the inner wall of the drill pipe 15.

[0046] ③The rotary motor 16 rotates along the cutting direction of the tool bit 24, initially rotating at a low speed, and the rotating housing 18 rotates; at this time, the cutting motor 19 works simultaneously. The cutting motor 19 drives the drive shaft 21 to rotate, driving the spiral slider 22 to rotate. The spiral slider 22 pushes the tool bit 24 from the low end to the high end of the spiral groove 28, and the tool bit 24 gradually extends outwards until it contacts the inner wall of the drill pipe 15 and starts cutting.

[0047] ④Because the self-locking ability of the spiral slider 22 itself is weak, there may be pits or scaling on the inner wall of the drill pipe 15, or the cutting part is not a standard circle, which will generate an inward force on the tool bit 24. While protecting the tool bit 24, the tool bit 24 will contract. To maintain the extended dimension of the tool bit 24, the cutting motor 19 starts intermittent operation. After the tool bit 24 is forced to contract, the cutting motor 19 starts and pushes the tool bit 24 out again.

[0048] ⑤Due to the force on the cutting motor 19 during the cutting of the tool bit 24, the control system parameters change. The control system transmits the parameters to the rotary motor 16. The rotary motor 16 maintains low-speed rotation and drives the bottom-hole cutting module 4 to intermittently cut the drill pipe 15 until the cutting part is cut into a complete circle, and the cutting motor 19 no longer performs intermittent operation.

[0049] ⑥The rotary motor 16 starts high-speed movement, and the cutting motor 19 starts to continuously push out the tool bit 24 according to the cutting parameters of the control system until the drill pipe 15 is cut off.

[0050] ⑦At this time, the rotary motor 16 cannot stop and must continue to rotate at high speed. The cutting motor 19 starts to rotate in the reverse direction. After gradually retracting the extended tool bit 24 to the original state, the cutting motor 19 stops working. Note that the rotary motor 16 must maintain high-speed rotation at this time because there will be a certain misalignment and displacement when the drill pipe 15 is cut off. If the rotary motor 16 stops rotating at this time, the tool bit 24 may be stuck.

[0051] ⑧After the rotary motor 16 stops rotating, the fixed drive motor 5 starts to rotate counterclockwise, pushing the slider one 9 and the slider two 11 to move outwards. The dovetail grooves on the inclined surfaces of the slider one 9 and the slider two 11 cooperate with the dovetail 25 on the inclined surface of the anchor block, and the anchor block 10 is slowly retracted until the original state.

[0052] ⑨The coaxial cable winch works to lift the cutting device out of the wellhead to complete the cutting.

Claims

1. A geological drilling hole bottom power cutting device, characterized in that: The invention comprises a rotating module (3) and a bottom hole cutting module (4), wherein the bottom hole cutting module (4) is located below the rotating module (3), wherein the rotating module (3) comprises a rotating motor (16), a power distribution slip ring (17) and a rotating housing (18), wherein the rotating motor (16) is connected to the rotating housing (18) via the power distribution slip ring (17), and the inner and outer rings of the power distribution slip ring (17) can rotate independently, thereby realizing independent rotation of the rotating housing (18); the bottom hole cutting module (4) comprises a cutting motor (19), a rotating device (20), a drive A driving shaft (21), a spiral slider (22), a cutting housing (23) and a cutter head (24); a cutting motor (19) is fixed in a rotating housing (18); a cutting housing (23) is provided at the bottom of the rotating housing (18); a cutter head hole (31) is provided on the wall of the cutting housing (23); and the cutter head (24) extends out of the cutter head hole (31) of the cutting housing (23); the cutting motor (19) is connected to the driving shaft (21) through a second rotating device (20); the driving shaft (21) is located in the cutting housing (23); and the driving shaft (21) Two spiral sliders (22) are arranged on the upper part, the spiral slider (22) is a cylinder, and a plurality of spiral grooves (28) are arranged on the axial section of the spiral slider (22), and the spiral grooves (28) are Archimedean spiral grooves; the two spiral sliders (22) are arranged on both sides of the cutter head (24), respectively, and a plurality of cutter heads (24) are arranged between the two spiral sliders (22), and the number of the cutter heads (24) is the same as the number of the spiral grooves (28), and the cutter head (24) is composed of a cutter body (26) and a sliding shaft (27), and the upper and lower ends of the cutter body (26) are Sliding shafts (27) are respectively provided on both sides. The sliding shafts (27) on the upper and lower sides of each cutter head (24) respectively match the spiral grooves (28) at the same position of the two spiral sliders (22). The cutter head (24) can extend outward or retract in the cutter head hole (31) of the cutting shell (23) as the sliding shaft (27) slides along the spiral groove (28). The cutting motor (19), the second rotating device (20), the driving shaft (21), the spiral slider (22), the cutting shell (23) and the cutter head (24) rotate together with the rotating shell (18).

2. A geological drilling hole bottom power cutting device according to claim 1, characterized in that: The rotating module (3) is located below the fixed module (2), and the fixed module (2) comprises a fixed drive motor (5), a rotating device (6), a forward and reverse screw mechanism, a pushing slider (9), an anchor block (10) and a pushing slider (11); the fixed drive motor (5) is connected to the forward and reverse screw mechanism via the rotating device (6), and the forward and reverse screw mechanism is a transmission pair formed by the forward and reverse screws (8), the forward screw nut (12) and the reverse screw nut (7), the forward screw nut (12) is provided with the pushing slider (11), and the reverse screw nut (7) is provided with the pushing slider (9). An anchor block (10) is provided between the push slider 1 (9) and the push slider 2 (11), and the anchor block (10) is in sliding contact with the push slider 1 (9) and the push slider 2 (11) respectively through an inclined dovetail groove structure; the forward and reverse lead screws (8) are forward and reverse trapezoidal lead screws, and the forward and reverse lead screw nut (12) and the reverse lead screw nut (7) are driven to move toward or relative to each other by rotating the forward and reverse lead screws (8), and the push slider 1 (9) and the push slider 2 (11) are driven to move toward or relative to each other, thereby realizing the extension and recovery of the anchor block (10) located between the push slider 1 (9) and the push slider 2 (11).

3. A geological drilling hole bottom power cutting device according to claim 2, characterized in that: The fixing module (2) is arranged below the hole bottom signal transmission module (1), and the hole bottom signal transmission module (1) is connected to the fixing module (2), the rotating module (3) and the hole bottom cutting module (4) to transmit signals.

4. A geological drilling hole bottom power cutting device according to claim 2, characterized in that: The pushing slider 1 (9) and the pushing slider 2 (11) are hollow shaft structures, through which the forward and reverse lead screws (8) pass; the inclined dovetail groove structure is a dovetail groove structure arranged on an inclined surface, and the inclined surfaces at the ends of the pushing slider 1 (9) and the pushing slider 2 (11) are both provided with dovetail grooves, which correspond to and match the dovetails (25) on the inclined surfaces on the upper and lower sides of the anchor block (10), respectively.

5. A geological drilling hole bottom power cutting device according to claim 2, characterized in that: The number of the anchor blocks (10) is four and they are evenly distributed around the forward and reverse screws (8); a fixed shell (13) is provided on the outer side of the forward and reverse screw mechanism, the fixed shell (13) is a hollow tube structure, and four rectangular long grooves are provided on the tube wall of the fixed shell (13), and the four anchor blocks (10) are respectively arranged in the corresponding rectangular long grooves.

6. A geological drilling hole bottom power cutting device according to claim 1 or 2, characterized in that: A drive shaft hole (29) is provided at the center of the two spiral sliders (22), and the drive shaft (21) is connected to the two spiral sliders (22) through the drive shaft hole (29); a keyway (30) is provided on the drive shaft holes (29) of the two spiral sliders (22), and the mounting key on the drive shaft (21) is matched and arranged in the keyway (30).

7. A geological drilling hole bottom power cutting device according to claim 6, characterized in that: The cutter head (24) comprises a rectangular cutter body (26), a cutting blade being arranged at the outer end of the cutter body (26), and sliding shafts (27) being arranged at the upper and lower sides of the cutter body (26). The sliding shafts (27) at the upper and lower sides of the cutter body (26) are controlled to be located at the positions of corresponding spiral grooves (28), thereby controlling the length of the cutter body (26) extending from the cutter head hole (31) of the cutting shell (23).

8. A geological drilling hole bottom power cutting device according to claim 7, characterized in that: The spiral groove (28) has a small starting point radius and a large ending point radius. When the spiral slider (22) rotates, the sliding shaft (27) of the cutter head (24) slides from the starting point of the spiral groove (28) to the ending point, and the cutter head (24) also extends from a low point to a high point, thereby completing the cutting of the wall of the drill rod (15).

9. A method for cutting the bottom of a geological drilling hole by power, using the geological drilling hole bottom power cutting device according to any one of claims 3 to 8, characterized in that The method comprises the following steps: conveying the cutting device to a corresponding cutting position in a drill rod (15), starting a fixed driving motor (5) of a fixed module (2), pushing a slider (9) and a slider (11) to move inward, pushing the slider (9) and the slider (11) to push an anchor block (10) outward, and the anchor block (10) extends out to contact and tighten the wall of the drill rod (15), thereby fixing the cutting device; starting a rotating motor (16) of a rotating module (3), rotating a rotating housing (18), and rotating a cutting motor (19) at the same time, and the cutting motor (19) drives a driving shaft (21) rotates, the driving shaft (21) drives the spiral slider (22) to rotate, and pushes the cutter head (24) from the lower end to the higher end of the spiral groove (28), and the cutter head (24) gradually extends outward until it contacts the inner wall of the drill pipe (15) and starts cutting. The power for rotary cutting is provided by the rotary motor (16) driving the rotary housing (18) to rotate. After the cutting is completed, the fixed module (2) moves in the reverse direction, the anchor block (10) retracts, and the cutting device is taken out. The bottom hole signal transmission module (1) is used to control the fixed module (2), the rotating module (3) and the bottom hole cutting module (4) and transmit signals.

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