A pipe string breakout tool with grouting circulation

Abstract

A tubing unbuckling tool with grouting circulation belongs to the technical field of equipment for oil tubing operations. In order to solve the problem that the external clamping structure is large and heavy; the internal clamping structure is adopted, the volume is reduced, but it relies on hydraulic drive control and there is a risk of hydraulic leakage, resulting in unreliable use, the outer periphery of the central shaft in the invention is respectively sleeved with a mechanical control unit, a clamping unit and a sealing unit, and the mechanical control unit is arranged at one end of the central shaft, the sealing unit is arranged at the other end of the central shaft, the clamping unit is arranged between the mechanical control unit and the sealing unit, and air pushing components are respectively embedded and installed on the outer walls on both sides of the outer periphery of the sealing unit, and oil pushing components are respectively embedded and installed on the outer walls at both ends of the outer periphery of the sealing unit. The present invention integrates the functions of equipment such as hanging cards, power tongs and grouting devices, and the device has the characteristics of small size, easy operation, and no need for external pipelines and power sources.

Description

Technical Field

[0001] The invention relates to the technical field of oil pipe string operation equipment, in particular to a pipe string breakout tool with grouting circulation. Background Art

[0002] Document CN107044260B discloses a threaded-drive, fully mechanical top-drive tubing lowering tool, wherein the upper end of an upper core shaft is threadedly connected to a top drive device, and the lower end of the upper core shaft is splined to a threaded drive system; the lower end of the threaded drive system is bolted to a power transmission system; the lower end of the power transmission system is connected to a slip system; the lower end of the slip system is bolted to a guide sealing system; and a spring system is installed at the upper end of the slip system.

[0003] The tubular lowering operation uses manual elevators or elevators / chucks to hold and suspend the tubular. It is mainly held on the outer wall of the tubular. The equipment is generally large in size and weight. When the tubular is threaded, it is necessary to use a power tong to make and break the thread. When the tubular lowering operation encounters resistance, it is necessary to connect a circulation head or grouting device to perform grouting and circulation operations. The entire tubular lowering operation involves a large number of equipment and a large number of personnel to operate the equipment. The risk of coordination between personnel is high, and the entire tubular lowering operation cycle is long. In the existing technology, some of the above equipment are partially integrated, but the external clamping type equipment has a large structure and is relatively bulky; some use internal clamping type, which is smaller in size, but relies on hydraulic drive control, which has the risk of hydraulic leakage, resulting in unreliable use.

[0004] In order to solve the above problems, a pipe string breakout tool with grouting cycle was proposed. Summary of the Invention

[0005] The object of the present invention is to provide a pipe string breakout tool with grouting circulation. By adopting this device, the problem that the external clamping type structure is large and bulky in the above background and the internal clamping type structure is reduced in size but relies on hydraulic drive control, there is a risk of hydraulic leakage, resulting in unreliable use.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a tubular unbuckling tool with a grouting cycle, comprising a central shaft, wherein the outer periphery of the central shaft is respectively sleeved with a mechanical control unit, a clamping unit and a sealing unit, and the mechanical control unit is arranged at one end of the central shaft, the sealing unit is arranged at the other end of the central shaft, the clamping unit is arranged between the mechanical control unit and the sealing unit, and air pushing assemblies are respectively embedded and installed on the outer walls on both sides of the outer periphery of the sealing unit, and oil pushing assemblies are respectively embedded and installed on the outer walls at both ends of the outer periphery of the sealing unit. When the central shaft is inserted and installed in the external tubular column, the air pushing assembly is used to expand the outer diameter of the sealing unit, and the oil pushing assembly is used to push the oil to between the inner wall of the external tubular column and the outer wall of the sealing unit for lubrication.

[0007] Furthermore, the central shaft is arranged in a hollow cylindrical shape, and the upper end of the central shaft is provided with a drill pipe thread connected to the external top drive rotating head. The hollow middle of the central shaft can provide a channel for mud flow, and the lower end of the central shaft is connected to the sealing unit through a thread. The mechanical control unit includes an upper impeller, an air nozzle, a middle impeller, a lower impeller, a lower impeller shell, an upper impeller outer cover, a cam locking sleeve, a seal and a fixed locking block. The upper impeller is relatively fixed to the central shaft through a thread and a key, the middle impeller and the upper impeller are connected by a serrated thread, the lower impeller sleeve is arranged on the central shaft, and the lower impeller and the middle impeller are in contact through a corrugated surface, the cam locking sleeve is connected and installed on the lower impeller through a fixed locking block, and an annular sealing chamber is formed between the lower impeller shell, the upper impeller outer cover and the seal, the air nozzle is installed on the inner wall of the annular sealing chamber, and the air nozzle is used to connect the annular sealing chamber to the outside.

[0008] Furthermore, the clamping unit includes a tooth plate holder and a tooth plate. The tooth plate is fixedly installed in the tooth plate holder, and the tooth plate holder is connected to the lower impeller. An inverted conical slope is provided at the middle of the central axis. The tooth plate is engaged with the inverted conical slope on the central axis, and the tooth surface of the tooth plate is arranged in a mesh tooth structure.

[0009] Furthermore, the sealing unit includes a leather cup frame, a cap, a sealing leather cup, a leather cup gasket and a guide shoe. The sealing leather cup is lifted and installed on the leather cup frame by the leather cup gasket, and the sealing leather cup is tightened by the cap so that the sealing leather cup is fixed on the central shaft. A pair of guide shoes are fixedly installed on the outer peripheral wall of the central shaft, and the sealing leather cup adopts a trumpet structure.

[0010] Furthermore, four receiving grooves are evenly arranged on the two ends and the outer walls of the middle part of the sealing leather bowl, and the inner walls of the middle part of the inner cavity of the receiving grooves at both sides of the sealing leather bowl are respectively connected with air storage inner grooves, and the inner walls of the middle part of the inner cavity of the receiving grooves at both ends of the sealing leather bowl are respectively connected with oil storage inner grooves, and first connecting holes are respectively provided on the inner bottom surface of the inner cavity of the air storage inner groove, and an annular air inlet groove is provided on the outer peripheral outer wall of the lower end of the sealing leather bowl, and the lower end of the first connecting hole is respectively connected with the annular air inlet grooves, an oil storage ring groove is provided in the outer peripheral inner cavity of the upper end of the sealing leather bowl, and an oil inlet ring groove is provided in the outer peripheral inner cavity of the lower end of the sealing leather bowl, and the oil inlet ring groove is provided at the lower end of the annular air inlet groove, the oil storage ring groove and the oil storage inner groove are connected by a connecting through hole, and the oil storage inner groove and the oil inlet ring groove are connected by an inclined connecting hole.

[0011] Furthermore, an elastic expansion ring is provided at the peripheral opening of the inner cavity of the annular air inlet groove, and the elastic expansion ring is thinner in the middle and thicker at the upper and lower ends. The elastic expansion ring has elastic deformation properties. A threaded hole is provided on the inner wall of one end of the inner cavity of the oil storage ring groove, and a rubber sealing gasket is fixedly installed on the inner wall of the inner end of the inner cavity of the threaded hole. A sealing screw is installed in the inner cavity of the threaded hole through threaded insertion. A number of oil outlets are evenly provided on the outer peripheral inner wall of the inner cavity of the oil inlet ring groove, and a first one-way valve is fixedly installed on the outer end of the inner cavity of the oil outlet, a second one-way valve is fixedly installed on the upper inner wall of the inner cavity of the inclined connecting hole, and a third one-way valve is fixedly installed on the upper inner wall of the inner cavity of the connecting through hole.

[0012] Furthermore, the air pushing assembly includes a push rod and an extrusion piston movably installed in the middle of the inner side of the push rod, and the extrusion piston is sealingly and slidingly set in the inner cavity of the air storage tank. The lower end of the push rod is movably installed in the receiving groove, and the upper end of the push rod is protruding from the receiving groove.

[0013] Furthermore, connecting shafts are fixedly installed on the middle outer walls on both sides of the lower end of the push rod, and a torsion spring is installed on the connecting shaft, and the connecting shaft is elastically installed in the receiving groove through the torsion spring. A T-shaped slide groove is provided on the middle outer wall on the inner side of the push rod, and a protruding groove is provided at the middle of the upper end of the push rod. Several anti-wear rollers are movably installed in the protruding groove, and the anti-wear rollers are respectively protruding from the protruding grooves.

[0014] Furthermore, the extrusion piston includes a piston body and a raised sleeve fixedly mounted on the middle outer wall of one side of the piston body, a telescopic column is slidably arranged in the inner cavity of the raised sleeve, and one end of the telescopic column is elastically slidably mounted in the inner cavity of the raised sleeve through a connecting spring, and a middle connecting block is movably mounted on the other end of the telescopic column, a T-shaped slider is fixedly mounted on the middle outer wall of the other end of the middle connecting block, and the T-shaped slider is slidably arranged in the T-shaped slide groove.

[0015] Furthermore, the composition and connection relationship of each structure in the oil pushing assembly are the same as the composition and connection relationship of each structure in the air pushing assembly, and the oil pushing assemblies are respectively arranged on the oil storage inner tank to squeeze and push out the oil in the inner cavity of the oil storage inner tank.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the functions of equipment such as elevators, power tongs and grouting devices are integrated through the pipe string buckling tool. The device has the characteristics of small size, easy operation, and no need for external pipelines and power sources. The multi-step inverted cone structure at the lower end of the central shaft engages with the inner cone of the tooth plate, which can make the axially moving tooth plate generate radial force and form positive pressure, so as to achieve the purpose of radially clamping the external pipe string. At the same time, the clamping becomes tighter and tighter under the dead weight of the external pipe string. The mechanical control unit composed of multiple impeller mechanisms can lock and loosen the device. Through threaded connection, the impeller combination can realize rapid axial release after rotation. Movement, while transmitting torque and axial force through the meshing of the corrugated surface of the impeller mechanism. An annular sealing chamber is formed inside the mechanical control unit. After the cam lock sleeve is unlocked from the lower impeller, it can pop out quickly, making the clamping faster and more effective. At the same time, it can effectively prevent the contamination of the internal impeller structure after the external mud penetrates. The tooth surface of the tooth plate adopts a mesh tooth structure, which can produce a larger friction coefficient in both the axial and radial directions. The sealing leather cup is supported on the leather cup frame by the leather cup gasket and is tightened with a cap to make the sealing leather cup relatively fixed, to prevent the deviation during insertion from causing uneven force, and to increase the service life of the sealing leather cup. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the mechanical control unit of the present invention;

[0019] Figure 3 It is a partial cross-sectional schematic diagram of the mechanical control unit of the present invention;

[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of the upper impeller of the present invention;

[0021] Figure 5 is a schematic cross-sectional view of the entire mechanical control unit of the present invention;

[0022] Figure 6 Schematic diagram of the overall cross-section of the holding unit of the present invention;

[0023] Figure 7 This is a schematic structural diagram of the present invention after the center shaft moves axially and the tooth plate extends radially;

[0024] Figure 8 This is a schematic diagram of the connection structure between the upper impeller and the middle impeller of the tooth plate of the present invention;

[0025] Figure 9 This is a schematic diagram of the locked state of the mechanical control unit of the present invention;

[0026] Figure 10 This is a schematic diagram of the separation structure of the upper impeller and the middle impeller of the present invention;

[0027] Figure 11 This is a schematic diagram of the mechanical control unit of the present invention in a buckled-up state;

[0028] Figure 12 This is a schematic diagram of the separation structure of the middle impeller and the lower impeller of the present invention;

[0029] Figure 13 This is a schematic diagram of the shackle state of the mechanical control unit of the present invention;

[0030] Figure 14 This is a schematic structural diagram of the sealing unit of the present invention;

[0031] Figure 15 Schematic cross-sectional view of the sealing cup of the present invention;

[0032] Figure 16 For the present invention Figure 15 A magnified view of point A;

[0033] Figure 17 This is a schematic diagram of the three-dimensional structure of the push rod of the present invention;

[0034] Figure 18 It is a schematic diagram of the three-dimensional structure of the extrusion piston of the present invention;

[0035] Figure 19 Schematic cross-sectional view of the oil storage inner tank of the present invention;

[0036] Figure 20 For the present invention Figure 19 Enlarged view of point B;

[0037] Figure 21 For the present invention Figure 19 Enlarged view of point C.

[0038] In the figure: 1. central axis; 2. mechanical control unit; 21. upper impeller; 22. air nozzle; 23. middle impeller; 24. lower impeller; 25. lower impeller housing; 26. upper impeller cover; 27. cam lock sleeve; 28. seal; 29. ​​fixed lock block; 290. annular sealing chamber; 3. clamping unit; 31. tooth plate holder; 32. tooth plate; 33. inverted cone slope; 4. sealing unit; 41. leather cup holder; 42. cap; 43. sealing leather cup; 431. receiving groove; 432. air storage inner groove; 433. oil storage inner groove; 434. first connecting hole; 435. annular air inlet groove; 4351. elastic expansion ring; 436. oil storage ring groove; 4361. threaded hole; 436 2. Rubber sealing gasket; 4363. Sealing screw; 437. Oil inlet ring groove; 4371. Oil outlet; 4372. First one-way valve; 438. Inclined connecting hole; 4381. Second one-way valve; 439. Connecting through hole; 4391. Third one-way valve; 44. Leather cup gasket; 45. Guide shoe; 5. Air push assembly; 51. Push rod; 511. Connecting shaft; 512. Torsion spring; 513. T-shaped slide; 514. Protruding groove; 515. Anti-wear roller; 52. Extrusion piston; 521. Piston body; 522. Protruding sleeve; 523. Telescopic column; 524. Connecting spring; 525. Middle connecting block; 526. T-shaped slider; 6. Oil push assembly; 7. External pipe column. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] In order to solve the technical problems that the external clamping structure of the pipe string breakout tool is large and heavy; the internal clamping structure is reduced in size, but relies on hydraulic drive control, there is a risk of hydraulic leakage, resulting in unreliable use, such as Figures 1-16 As shown, the following preferred technical solutions are provided:

[0041] A pipe string buckling tool with a grouting cycle includes a center shaft 1, and the outer circumference of the center shaft 1 is respectively sleeved with a mechanical control unit 2, a holding unit 3 and a sealing unit 4, and the mechanical control unit 2 is arranged at one end of the center shaft 1, and the sealing unit 4 is arranged at the other end of the center shaft 1, and the holding unit 3 is arranged between the mechanical control unit 2 and the sealing unit 4, and air pushing components 5 are respectively embedded and installed on the outer walls on both sides of the outer circumference of the sealing unit 4, and oil pushing components 6 are respectively embedded and installed on the outer walls at both ends of the outer circumference of the sealing unit 4. When the center shaft 1 is inserted and installed in an external pipe string 7, the air pushing component 5 is used to expand the outer diameter of the sealing unit 4, and the oil pushing component 6 is used to push oil to between the inner wall of the external pipe string 7 and the outer wall of the sealing unit 4 for lubrication.

[0042] The central shaft 1 connects all the units on the device in series. The central shaft 1 is arranged in a hollow cylindrical shape. The upper end of the central shaft 1 is provided with a drill pipe thread connected to the external top drive rotating head, suspending the entire pipe string to bear the main load. Driven by the rotation of the central shaft 1, the mechanical control unit 2 locks or releases the clamping unit 3, and the sealing unit 4 plays a sealing role. The hollowing in the middle of the central shaft 1 can provide a channel for mud flow. The hollowing in the middle of the central shaft 1 can provide a channel for mud flow. The lower end of the central shaft 1 is connected to the sealing unit 4 through a thread.

[0043] The mechanical control unit 2 includes an upper impeller 21, an air nozzle 22, a middle impeller 23, a lower impeller 24, a lower impeller housing 25, an upper impeller cover 26, a cam lock sleeve 27, a seal 28 and a fixed lock block 29. The upper impeller 21 is relatively fixed to the central shaft 1 through a thread and a key. The middle impeller 23 and the upper impeller 21 are connected by a multi-start serrated thread to achieve rotation and axial movement. The application of the multi-start thread can make the axial movement transmission faster. The lower impeller 24 is sleeved on the central shaft 1, and the lower impeller 24 and the middle impeller 23 are connected by a corrugated surface. Contact, the cam lock sleeve 27 is connected and installed on the lower impeller 24 through the fixed locking block 29, and an annular sealing chamber 290 is formed between the lower impeller shell 25, the upper impeller outer cover 26 and the seal 28. The air nozzle 22 is installed on the inner wall of the annular sealing chamber 290, and the air nozzle 22 is used to connect the annular sealing chamber 290 to the outside. After the annular sealing chamber 290 is inflated, it becomes an air spring. After the operating center shaft 1 rotates clockwise, the cam lock sleeve 27 is unlocked from the lower impeller 24, and the lower impeller 24 and the holding unit 3 connected to the lower impeller 24 can be quickly popped out.

[0044] The holding unit 3 includes a tooth plate holder 31 and a tooth plate 32. The tooth plate 32 is fixedly installed in the tooth plate holder 31, and the tooth plate holder 31 is connected to the lower impeller 24. It is mainly used to generate axial movement and transmit torque. An inverted conical slope 33 is provided at the middle of the center shaft 1. The tooth plate 32 is engaged with the inverted conical slope 33 on the center shaft 1. The multi-step inverted conical structure at the lower end of the center shaft 1 is engaged with the inner cone of the tooth plate 32, which can make the axially moving tooth plate 32 generate a radial component force, thereby achieving the purpose of radially holding the pipe column. At the same time, under the action of the pipe column's own weight, the clamping becomes tighter and tighter, and the tooth surface of the tooth plate 32 is arranged in a mesh tooth structure.

[0045] The lower impeller 24 is sleeved on the central shaft 1 and contacts the middle impeller 23 through the corrugated surface. The cam lock sleeve 27 is connected to the lower impeller 24 through the fixed locking block 29 to transmit torque and axial force. After tightening, its hook can hook the upper impeller 21, so that the device is in a locked state. The tooth plate holder 31 is at the uppermost end at this time, and the tooth plate 32 is retracted into the tooth plate holder 31. The tooth surface of the tooth plate 32 adopts a mesh tooth structure, which can generate a larger friction coefficient in both axial and radial directions.

[0046] Specifically, when the external top drive rotating head is operated to drive the center shaft 1 to rotate clockwise, the cam lock sleeve 27 disengages from the upper impeller 21, and under the action of the air pressure in the annular sealing chamber 290, the lower impeller 24 and the tooth plate holder 31 connected to the lower impeller 24 are pushed downward. The tooth plate 32 is pushed out along the conical surface of the center shaft 1 by the tooth plate holder 31, and is clamped to the inner wall of the pipe string, and the center shaft 1 continues to rotate clockwise. At the same time, the center shaft 1 drives the upper impeller 21 to rotate clockwise, and the middle impeller 23 moves downward under the transmission of the serrated thread, pressing against the lower impeller 24 and the tooth plate holder 31 connected to the lower impeller 24 to prevent the tooth plate 32 from retreating. When a certain torque is reached, the tooth plate 32 is completely clamped with the external pipe string 7 to form a whole. At this time, the pipe string can be lifted. When the threads of the external pipe string 7 are buckled, the center shaft 1 continues to rotate clockwise to perform the buckling operation.

[0047] Furthermore, the external top drive rotating head is operated to drive the center shaft 1 to rotate clockwise, the cam lock sleeve 27 is disengaged from the upper impeller 21, and under the action of the air pressure in the annular sealing chamber 290, the tooth plate 32 is quickly clamped to the inner wall of the pipe string. At this time, the center shaft 1 is rotated counterclockwise, and the middle impeller 23 retreats to the uppermost position. Its upper slope engages with the slope of the upper impeller 21, transmitting the torque transmitted from the center shaft 1 through the upper impeller 21, generating a counterclockwise movement trend. The corrugated surface at the lower end of the middle impeller 23 abuts the corrugated surface of the lower impeller 24. Under the action of the corrugated surface, the downward axial component of force and the counterclockwise torque can be transmitted simultaneously. The downward axial component of force can prevent the tooth plate 32 from retreating, facilitating the reliable clamping of the tooth plate 32, and the counterclockwise torque can be used for pipe string shattering operations.

[0048] The sealing unit 4 includes a leather cup frame 41, a cap 42, a sealing leather cup 43, a leather cup gasket 44 and a guide shoe 45. The sealing leather cup 43 is lifted and installed on the leather cup frame 41 by the leather cup gasket 44, and the sealing leather cup 43 is tightened by the cap 42, so that the sealing leather cup 43 is relatively fixed to prevent deviation during insertion and uneven force. The sealing leather cup 43 has a sealing lip, and the leather cup frame 41 is a hollow structure. After the mud flows into the external pipe column 7 through the hollow inner cavity of the central shaft 1 and the leather cup frame 41, it forms a self-seal under the action of the sealing lip of the sealing leather cup 43. A pair of guide shoes 45 are fixedly installed on the outer peripheral wall of the central shaft 1. The guide shoes 45 serve to guide the insertion of the external pipe column 7. The sealing leather cup 43 adopts a trumpet structure, which can isolate the inner cavity of the external pipe column 7 from the outside world, providing necessary conditions for mud circulation.

[0049] Specifically, the functions of equipment such as hanging cards, power tongs and grouting devices are integrated through the pipe string unbuckling tool. The device has the characteristics of small size, easy operation, and no need for external pipelines and power sources. The multi-step inverted cone structure at the lower end of the central shaft 1 is engaged with the inner cone of the tooth plate 32, which can make the axially moving tooth plate 32 generate radial force and form positive pressure, so as to achieve the purpose of radially clamping the external pipe string 7. At the same time, the external pipe string 7 becomes tighter and tighter under its own weight. The mechanical control unit 2 composed of multiple impeller mechanisms can lock and loosen the device. Through threaded connection, the impeller combination can realize rapid axial movement after rotation. At the same time, through the corrugation of the impeller mechanism The meshing of the surfaces transmits torque and axial force, and an annular sealing chamber 290 is formed inside the mechanical control unit 2. After the cam lock sleeve 21 is unlocked from the lower impeller 24, it can pop out quickly, making the clamping faster and more effective. At the same time, it can effectively prevent the external mud from penetrating and polluting the internal impeller structure. The tooth surface of the tooth plate 32 adopts a mesh tooth structure, which can produce a larger friction coefficient in both the axial and radial directions. The sealing leather cup 43 is supported on the leather cup frame 41 by the leather cup gasket 44 and is tightened by the cap 42, so that the sealing leather cup 43 is relatively fixed, preventing deviation during insertion from causing uneven force, and improving the service life of the sealing leather cup 43.

[0050] In order to solve the technical problems that when the center shaft 1 is inserted into the inner cavity of the outer pipe string 7, the sealing cup 43 slides and rubs on the inner wall of the outer pipe string 7, which easily causes the lip of the sealing cup 43 to wear, thereby affecting the sealing performance, and at the same time shortening the service life and consuming manpower to replace, as shown in the following example: Figures 17-20 As shown, the following preferred technical solutions are provided:

[0051] Four receiving grooves 431 are evenly arranged on the two ends and the outer walls of the middle part of the sealing leather cup 43, and the inner walls of the middle part of the inner cavity of the receiving grooves 431 on both sides of the sealing leather cup 43 are respectively connected with air storage inner grooves 432, and the inner walls of the middle part of the inner cavity of the receiving grooves 431 at both ends of the sealing leather cup 43 are respectively connected with oil storage inner grooves 433, and the inner bottom surface of the inner cavity of the air storage inner groove 432 is respectively provided with a first connecting hole 434, and the outer peripheral wall of the lower end of the sealing leather cup 43 is provided with an annular air inlet groove 435, and the lower end of the first connecting hole 434 is respectively connected with the annular air inlet groove 435, and the sealing leather cup An oil storage ring groove 436 is provided in the outer peripheral inner cavity at the upper end of 43, an oil inlet ring groove 437 is provided in the outer peripheral inner cavity at the lower end of the sealing leather cup 43, and the oil inlet ring groove 437 is provided at the lower end of the annular air inlet groove 435, the oil storage ring groove 436 and the oil storage inner groove 433 are connected through a connecting through hole 439, and the oil storage inner groove 433 and the oil inlet ring groove 437 are connected through an inclined connecting hole 438, and an elastic expansion ring 4351 is provided at the outer peripheral opening of the inner cavity of the annular air inlet groove 435, and the elastic expansion ring 4351 is thin in the middle and thick at the upper and lower ends, and the elastic expansion ring 4351 has elastic deformation properties.

[0052] The air push assembly 5 includes a push rod 51 and an extrusion piston 52 movably installed at the middle part of the inner side of the push rod 51, and the extrusion piston 52 is sealingly and slidably arranged in the inner cavity of the air storage tank 432. The lower end of the push rod 51 is movably installed in the receiving groove 431, and the upper end of the push rod 51 is convex and arranged in the receiving groove 431. A connecting shaft 511 is fixedly installed on the outer wall in the middle part of both sides of the lower end of the push rod 51, and a torsion spring 512 is installed on the connecting shaft 511. The connecting shaft 511 is elastically movably installed in the receiving groove 431 through the torsion spring 512. A T-shaped slide groove 513 is provided on the inner middle outer wall of the push rod 51, and a convex groove is provided at the middle part of the upper end of the push rod 51 514, a plurality of anti-wear rollers 515 are movably installed in the protruding groove 514, and the anti-wear rollers 515 are respectively protruding from the protruding groove 514. The extrusion piston 52 includes a piston body 521 and a protruding sleeve 522 fixedly installed on the middle outer wall of one side of the piston body 521. A telescopic column 523 is slidably arranged in the inner cavity of the protruding sleeve 522, and one end of the telescopic column 523 is elastically slidably installed in the inner cavity of the protruding sleeve 522 through a connecting spring 524. A middle connecting block 525 is movably installed on the other end of the telescopic column 523. A T-shaped slider 526 is fixedly installed on the middle outer wall of the other end of the middle connecting block 525, and the T-shaped slider 526 is slidably arranged in the T-shaped slide groove 513.

[0053] Specifically, the gas storage tank 432 is filled with inert gas. When the staff operates the equipment to insert the central shaft 1 into the inner cavity of the outer tube column 7, the anti-wear roller 515 will contact the inner wall of the inner cavity of the outer tube column 7. Driven by the squeezing of the inner wall of the inner cavity of the outer tube column 7, the push rod 51 can be pushed to rotate along the connecting shaft 511, so that the middle part of the push rod 51 can be squeezed inward to push the middle connecting block 525. The arrangement of the T-shaped slider 526 and the T-shaped groove 513 can overcome the arc movement of the middle position of the push rod 51 when it rotates along the connecting shaft 511. At this time, under the elastic force of the connecting spring 524 , the piston body 521 can be driven by the raised sleeve 522 to move toward the inner side of the inner cavity of the gas storage tank 432, so that the inert gas can be pressed into the annular air inlet groove 435 through the first connecting hole 434, and the air pressure in the inner cavity of the annular air inlet groove 435 will increase, thereby pushing the middle part of the elastic expansion ring 4351 to expand outward, and the gap caused by wear between the external pipe string 7 and the sealing leather cup 43 can be sealed. This setting not only cleverly utilizes the central axis 1 to be inserted into the inner cavity of the external pipe string 7, and the extrusion pressure of the inner wall of the external pipe string 7, but also is fully automatic and does not require manual operation. At the same time, it also ensures the sealing effect and improves the service life.

[0054] Furthermore, by elastically sliding the telescopic column 523 in the inner cavity of the raised sleeve 522, the air push assembly 5 can pressurize a certain amount of inert gas according to the wear gap conditions, thereby achieving adaptive sealing of different gap sizes while ensuring the sealing effect.

[0055] In order to solve the technical problem that the friction between the inner wall of the outer pipe string 7 and the lip of the packer cup 43 is large, thereby causing large wear and reducing the service life, as shown in FIG. Figures 14-21 As shown, the following preferred technical solutions are provided:

[0056] A threaded hole 4361 is provided on the inner wall of one end of the inner cavity of the oil storage ring groove 436, and a rubber sealing gasket 4362 is fixedly installed on the inner wall of the inner end of the inner cavity of the threaded hole 4361. A sealing screw 4363 is installed in the inner cavity of the threaded hole 4361 through threaded insertion. The staff can remove the sealing screw 4363, use a syringe to penetrate the rubber sealing gasket 4362, and fill the inner cavity of the oil storage ring groove 436 with oil at one time, so that the device can be lubricated multiple times.

[0057] A number of oil outlets 4371 are evenly arranged on the inner peripheral wall of the inner cavity of the oil inlet ring groove 437, and a first one-way valve 4372 is fixedly installed at the outer end of the inner cavity of the oil outlet 4371. The first one-way valve 4372 is used to discharge oil from the opening of the oil outlet 4371 and prevent external debris from entering the oil outlet 4371. Through the small-diameter setting of the oil outlet 4371, the oil outlet 4371 can always be in an oil-discharging lubrication state when the center shaft 1 slides in the inner cavity of the external pipe column 7.

[0058] A second one-way valve 4381 is fixedly mounted on the inner wall of the upper end of the inner cavity of the inclined communicating hole 438 .

[0059] A third one-way valve 4391 is fixedly mounted on the inner wall of the upper end of the inner cavity of the connecting through hole 439 .

[0060] The composition and connection relationship of each structure in the oil pushing component 6 are the same as the composition and connection relationship of each structure in the air pushing component 5, and the oil pushing component 6 is respectively arranged on the oil storage inner tank 433, and is used to squeeze and push out the oil in the inner cavity of the oil storage inner tank 433.

[0061] Specifically, when the staff operates the equipment to insert the central shaft 1 into the inner cavity of the external tubular column 7, the oil pushing assembly 6 will be driven by the inner wall of the inner cavity of the external tubular column 7, thereby pressing the oil in the inner cavity of the oil storage tank 433 into the oil inlet ring groove 437 through the inclined connecting hole 438, and discharge the oil between the external tubular column 7 and the sealing leather cup 43 through a number of oil outlets 4371, which can achieve a lubricating effect to reduce friction, thereby reducing wear and improving service life.

[0062] Furthermore, the setting of the third one-way valve 4391 enables the oil storage annular groove 436 to be connected to the oil storage inner groove 433, and the setting of the second one-way valve 4381 enables the oil storage inner groove 433 to be connected to the oil outlet 4371. When the center shaft 1 is removed from the external pipe column 7, the oil pushing assembly 6 will be reset. Under the action of the second one-way valve 4381 and the third one-way valve 4391, the oil storage inner groove 433 will automatically suck in supplementary oil from the oil storage annular groove 436, without the need for frequent manual replenishment of oil, saving manpower and facilitating use.

[0063] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0064] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A pipe string breakout tool with grouting circulation, comprising a central shaft (1), characterized in that: The outer periphery of the central shaft (1) is respectively sleeved with a mechanical control unit (2), a holding unit (3) and a sealing unit (4), and the mechanical control unit (2) is arranged at one end of the central shaft (1), the sealing unit (4) is arranged at the other end of the central shaft (1), the holding unit (3) is arranged between the mechanical control unit (2) and the sealing unit (4), and the outer walls on both sides of the outer periphery of the sealing unit (4) are respectively embedded with air push components (5), and the outer walls on both ends of the outer periphery of the sealing unit (4) are respectively embedded with oil push components (6 ), when the central shaft (1) is inserted and installed in the external tubular column (7), the air pushing assembly (5) is used to expand the outer diameter of the sealing unit (4), and the oil pushing assembly (6) is used to push the oil to between the inner wall of the external tubular column (7) and the outer wall of the sealing unit (4) for lubrication; the central shaft (1) is arranged in a hollow cylindrical body, the upper end of the central shaft (1) is provided with a drill pipe thread connected to the external top drive rotating head, the middle of the central shaft (1) is hollowed out to provide a channel for mud flow, and the lower end of the central shaft (1) is connected to the sealing unit (4) through a thread; The mechanical control unit (2) comprises an upper impeller (21), an air nozzle (22), a middle impeller (23), a lower impeller (24), a lower impeller housing (25), an upper impeller outer cover (26), a cam lock sleeve (27), a seal (28) and a fixed lock block (29), wherein the upper impeller (21) is relatively fixed to the central shaft (1) through a thread and a key, the middle impeller (23) and the upper impeller (21) are connected through a sawtooth thread, the lower impeller (24) is sleeved on the central shaft (1), and the lower impeller (24) and the middle impeller (23) are in contact through a corrugated surface, the cam lock sleeve (27) is connected and installed on the lower impeller (24) through the fixed lock block (29), the lower impeller housing (25), An annular sealing chamber (290) is formed between the upper impeller outer cover (26) and the sealing member (28), and the air nozzle (22) is installed on the inner wall of the annular sealing chamber (290), and the air nozzle (22) is used to connect the annular sealing chamber (290) to the outside; the sealing unit (4) includes a leather cup frame (41), a cap (42), a sealing leather cup (43), a leather cup gasket (44) and a guide shoe (45), the sealing leather cup (43) is lifted and installed on the leather cup frame (41) by the leather cup gasket (44), and the sealing leather cup (43) is tightened by the cap (42), so that the sealing leather cup (43) is fixed on the central shaft (1), and a pair of guide shoes (45) are fixedly installed on the outer peripheral wall of the central shaft (1); The packing leather bowl (43) is provided with a bell mouth structure.

2. The pipe string breakout tool with grouting cycle according to claim 1, characterized in that: The clamping unit (3) includes a tooth plate holder (31) and a tooth plate (32), the tooth plate (32) is fixedly mounted in the tooth plate holder (31), and the tooth plate holder (31) is connected to the lower impeller (24), an inverted conical slope (33) is provided at the middle of the central shaft (1), and the tooth plate (32) is engaged with the inverted conical slope (33) on the central shaft (1); The tooth surface of the tooth plate (32) is arranged in a mesh tooth-shaped structure.

3. The pipe string breakout tool with grouting cycle according to claim 1, characterized in that: Four receiving grooves (431) are evenly arranged on the two ends and the outer walls of the middle part of the sealing leather bowl (43), and the inner walls of the middle part of the inner cavity of the receiving grooves (431) at both sides of the sealing leather bowl (43) are connected with air storage inner grooves (432), and the inner walls of the middle part of the inner cavity of the receiving grooves (431) at both ends of the sealing leather bowl (43) are connected with oil storage inner grooves (433), and the inner bottom surface of the inner cavity of the air storage inner groove (432) is respectively provided with a first connecting hole (434), and the outer peripheral wall of the lower end of the sealing leather bowl (43) is provided with an annular air inlet groove (435). ), the lower end of the first communicating hole (434) is respectively communicated with the annular air inlet groove (435), an oil storage annular groove (436) is provided in the outer peripheral inner cavity of the upper end of the sealing leather cup (43), an oil inlet annular groove (437) is provided in the outer peripheral inner cavity of the lower end of the sealing leather cup (43), and the oil inlet annular groove (437) is provided at the lower end of the annular air inlet groove (435), the oil storage annular groove (436) and the oil storage inner groove (433) are communicated through a connecting through hole (439), and the oil storage inner groove (433) and the oil inlet annular groove (437) are communicated through an inclined communicating hole (438).

4. The pipe string breakout tool with grouting cycle according to claim 3, characterized in that: An elastic expansion ring (4351) is provided at the outer peripheral opening of the inner cavity of the annular air inlet groove (435), and the elastic expansion ring (4351) is thin in the middle and thick at the upper and lower ends. The elastic expansion ring (4351) has elastic deformation properties. A threaded hole (4361) is provided on the inner wall of one end of the inner cavity of the oil storage ring groove (436), and a rubber sealing gasket (4362) is fixedly installed on the inner wall of the inner end of the inner cavity of the threaded hole (4361), and a sealing screw (4363) is inserted into the inner cavity of the threaded hole (4361) through a thread. A plurality of oil outlets (4371) are evenly arranged on the outer peripheral inner wall of the inner cavity of the oil inlet ring groove (437), and a first one-way valve (4372) is fixedly installed at the outer end of the inner cavity of the oil outlet (4371); A second one-way valve (4381) is fixedly mounted on the inner wall of the upper end of the inner cavity of the inclined communicating hole (438); A third one-way valve (4391) is fixedly mounted on the inner wall of the upper end of the inner cavity of the connecting through hole (439).

5. The pipe string breakout tool with grouting cycle according to claim 4, characterized in that: The air push assembly (5) includes a push rod (51) and an extrusion piston (52) movably mounted at the middle of the inner side of the push rod (51), and the extrusion piston (52) is sealingly slidably arranged in the inner cavity of the air storage inner groove (432), the lower end of the push rod (51) is movably mounted in the receiving groove (431), and the upper end of the push rod (51) is arranged to protrude from the receiving groove (431).

6. The pipe string breakout tool with grouting circulation according to claim 5, characterized in that: A connecting shaft (511) is fixedly mounted on the middle outer walls of both sides of the lower end of the push rod (51), a torsion spring (512) is mounted on the connecting shaft (511), and the connecting shaft (511) is elastically mounted in the receiving groove (431) through the torsion spring (512), a T-shaped slide groove (513) is provided on the middle outer wall of the inner side of the push rod (51), a protruding groove (514) is provided at the middle of the upper end of the push rod (51), and a plurality of anti-wear rollers (515) are movably mounted in the protruding groove (514), and the anti-wear rollers (515) are respectively protruding from the protruding groove (514).

7. The pipe string breakout tool with grouting circulation according to claim 6, characterized in that: The extrusion piston (52) includes a piston body (521) and a protruding sleeve (522) fixedly mounted on the middle outer wall of one side of the piston body (521). A telescopic column (523) is slidably arranged in the inner cavity of the protruding sleeve (522), and one end of the telescopic column (523) is elastically slidably mounted in the inner cavity of the protruding sleeve (522) via a connecting spring (524). A middle connecting block (525) is movably mounted on the other end of the telescopic column (523). A T-shaped slider (526) is fixedly mounted on the middle outer wall of the other end of the middle connecting block (525), and the T-shaped slider (526) is slidably arranged in the T-shaped slot (513).

8. The pipe string breakout tool with grouting cycle according to claim 7, characterized in that: The composition and connection relationship of each structure in the oil pushing assembly (6) are the same as the composition and connection relationship of each structure in the air pushing assembly (5), and the oil pushing assembly (6) is respectively arranged on the oil storage inner tank (433) to squeeze and push out the oil in the inner cavity of the oil storage inner tank (433).

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