Anti-tripping and anti-degumming screw drill for ultra-deep complex well and machining process

Abstract

The invention relates to the technical field of screw drilling tools, in particular to an anti-tripping and anti-degumming screw drilling tool for an ultra-deep complex well and a machining process, the anti-tripping and anti-degumming screw drilling tool comprises a transmission shaft assembly, a universal shaft assembly, a motor assembly and a bypass valve assembly, the transmission shaft assembly, the universal shaft assembly, the motor assembly and the bypass valve assembly are sequentially arranged from left to right; the motor assembly is fixedly connected with the bypass valve assembly; and the first connecting mechanism is used for connecting the transmission shaft assembly and the universal shaft assembly, the first connecting mechanism comprises a first connecting cylinder fixedly connected to the left side of the universal shaft assembly, a first annular groove is formed in the right side of the transmission shaft assembly, and a first internal thread layer is arranged on the inner wall of the first annular groove. When the self-locking device is used, self-locking operation is achieved on the basis of threaded connection under the cooperation of the first locking mechanism and the second locking mechanism, compared with the prior art, loosening and falling off of a drilling tool part connecting buckle are effectively avoided, and the safety of actual use is improved.

Description

Technical Field

[0001] The invention relates to the technical field of screw drill tools, and in particular to an anti-slip and anti-debonding screw drill tool for ultra-deep and complex wells and a processing technology thereof. Background Art

[0002] Deep formation exploration is at the forefront of earth exploration science and is the only way to solve the problem of human energy resources. At present, oil and gas exploration in countries around the world is expanding towards deep and complex formations. Oil and gas wells in this field often have high well temperatures, hard formations, strong corrosion, and deflected well walls. Many of these ultra-deep and complex wells are directional and horizontal wells. Screw drill bits are the most ideal drilling tools. Screw drill bits are a type of volumetric downhole power tool powered by drilling fluid. Under the action of hydraulic pressure, the rotor rotates clockwise around the stator axis, and transmits the speed and torque to the drill bit through the universal joint and drive shaft to achieve drilling operations.

[0003] When the drill bit is drilling in a hard formation, the hard rock formation increases the resistance when the drill bit is embedded, and the drill bit motor often breaks the drill bit, causing the drill bit motor to generate reverse torque. In the prior art, the connection between the drive shaft assembly, the universal shaft assembly and the motor assembly are all threaded. When the reverse torque is generated, it is very easy to cause the drill bit housing connection buckle to loosen or fall off. The internal friction generated by the rotation of the rotor and the stator, and the external friction generated by the contact between the drill bit housing and the deflected well wall will cause the drill bit component connection buckle to loosen and fall off, resulting in downhole accidents. The high well temperature and strong corrosion in ultra-deep formations will also cause the motor rubber stator lining to expand and age, causing the lining to tear and fall off. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art, and to propose an anti-slip and anti-debonding screw drilling tool for ultra-deep and complex wells. During specific use, the anti-slip effect is achieved by improving the motor lining and the inside of the stator, in combination with the first locking mechanism and the second locking mechanism. The overall safety is stronger and it is more suitable for complex underground environments.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An anti-slip and anti-debonding screw drilling tool for ultra-deep and complex wells comprises a transmission shaft assembly, a universal shaft assembly, a motor assembly and a bypass valve assembly, wherein the transmission shaft assembly, the universal shaft assembly, the motor assembly and the bypass valve assembly are arranged in sequence from left to right, and the motor assembly and the bypass valve assembly are fixedly connected; a first connecting mechanism, wherein the first connecting mechanism is used to connect the transmission shaft assembly and the universal shaft assembly, wherein the first connecting mechanism comprises a first connecting cylinder fixedly connected to the left side of the universal shaft assembly, wherein a first annular groove is provided on the right side of the transmission shaft assembly, a first internal thread layer is provided on the inner wall of the first annular groove, a first external thread layer is provided on the outer side of the first connecting cylinder, and the first internal thread layer cooperates with the first external thread layer; a second connecting mechanism, wherein the second connecting mechanism is used to connect the universal shaft assembly and the motor assembly; a first locking mechanism, wherein the first locking mechanism cooperates with the first connecting mechanism to ensure the tightness of the connection between the transmission shaft assembly and the universal shaft assembly; and a second locking mechanism, wherein the second locking mechanism cooperates with the second connecting mechanism to ensure the tightness of the connection between the universal shaft assembly and the motor assembly.

[0007] In order to better achieve the above-mentioned purpose, the present invention adopts a further technical solution: the second connecting mechanism includes a second connecting cylinder fixedly connected to the right side of the universal joint assembly, a third annular groove is opened on the left side of the motor assembly, a second external thread layer is arranged on the outer side of the second connecting cylinder, a second internal thread layer is arranged on the inner side of the third annular groove, and the second external thread layer cooperates with the second internal thread layer.

[0008] In order to better achieve the above-mentioned purpose, the present invention adopts a further technical solution: the first locking mechanism includes a first limit groove symmetrically opened on the inner wall of the first annular groove, and two first rectangular grooves are symmetrically opened on the outer side of the first connecting tube, and the two first rectangular grooves are each provided with a first limit block that can slide up and down, and the opposite sides of the two first limit blocks are elastically connected to the inner wall of the corresponding first rectangular groove through a first spring.

[0009] In order to better achieve the above-mentioned purpose, the present invention adopts a further technical solution: each of the first limiting blocks cooperates with the corresponding first limiting groove.

[0010] In order to better achieve the above-mentioned purpose, the present invention adopts a further technical solution: the second locking mechanism includes two second limit grooves symmetrically opened on the inner wall of the third annular groove, and two second rectangular grooves are symmetrically opened on the outer side of the second connecting tube, and the two second rectangular grooves are each provided with a second limit block that can slide up and down, and the opposite sides of the two second limit blocks are elastically connected to the inner wall of the corresponding second rectangular groove through a second spring.

[0011] In order to better achieve the above-mentioned purpose, the present invention adopts a further technical solution: the first limit block and the second limit block are both wedge-shaped blocks.

[0012] In order to better achieve the above-mentioned purpose, the present invention adopts a further technical solution: a second annular groove is provided on the outer side of the transmission shaft assembly, a first rotating ring is rotatably connected in the second annular groove, a first rubber layer is provided on the inner side of the first rotating ring, two first magnetic blocks are symmetrically embedded in the first rotating ring, a fourth annular groove is provided on the outer side of the motor assembly, a second rotating ring is rotatably connected in the fourth annular groove, a second rubber layer is provided on the inner side of the second rotating ring, two second magnetic blocks are symmetrically embedded on the inner wall of the second rotating ring, and each of the first limit block and the second limit block is magnetic.

[0013] The processing technology of the anti-slipping and anti-debonding screw drilling tool for ultra-deep and complex wells is used for the above-mentioned screw drilling tool, and comprises the following steps:

[0014] Step 1: Add 20-25% polyurethane, 25-30% polyether, 15-20% high molecular weight polytrifluorochloroethylene, and 10-15% direct 20-25μm glass fiber into a mixer according to the mass ratio, stir at 1500r / min for 1h, add 4-6% zinc stearate lubricant, 5-6% bisphosphite antioxidant, 7-8% diphenyl phosphate plasticizer, and 2-3% cyclohexanone cosolvent after mixing evenly, mix at a roller temperature of 190-210°, mix for 2h, and make a motor lining;

[0015] Step 2: The inner wall of the stator metal shell is subjected to rust removal and sandblasting treatment. A groove with a length of 30 mm, a width of 5 mm, and a depth of 5 mm is symmetrically milled longitudinally on the inner wall of the stator metal shell every 500 mm. The plasticized molten high-density material is injected into the cavity between the mold core and the inner wall of the stator shell. The synthetic material entering the multiple grooves inside the stator is condensed and implanted into the inner wall of the stator.

[0016] Step 3: Assemble the motor assembly;

[0017] Step 4: Assemble the bypass valve assembly, the motor assembly, the universal shaft assembly and the transmission shaft assembly to obtain the screw drill tool body.

[0018] In order to better achieve the above purpose, the present invention adopts a further technical solution: a processing technology for anti-slipping and anti-debonding screw drilling tools for ultra-deep complex wells, which is used for the above-mentioned screw drilling tools, comprising the following steps:

[0019] Step 1: Add 20% polyurethane, 30% polyether, 20% high molecular weight polytrifluorochloroethylene, and 10% glass fiber with a diameter of 20-25 μm into a mixer according to the mass ratio, stir at a speed of 1500 r / min for 1 hour, add 5% zinc stearate lubricant, 5% bisphosphite antioxidant, 8% diphenyl phosphate plasticizer, and 2% cyclohexanone cosolvent after mixing evenly, mix at a roller temperature of 200°, mix for 2 hours, and make a motor lining;

[0020] Step 2: The inner wall of the stator metal shell is subjected to rust removal and sandblasting treatment. A groove with a length of 30 mm, a width of 5 mm, and a depth of 5 mm is symmetrically milled longitudinally on the inner wall of the stator metal shell every 500 mm. The plasticized molten high-density material is injected into the cavity between the mold core and the inner wall of the stator shell. The synthetic material entering the multiple grooves inside the stator is condensed and implanted into the inner wall of the stator.

[0021] Step 3: Assemble the motor assembly;

[0022] Step 4: Assemble the bypass valve assembly, the motor assembly, the universal shaft assembly and the transmission shaft assembly to obtain the screw drill tool body.

[0023] In order to better achieve the above purpose, the present invention adopts a further technical solution: a processing technology for anti-slipping and anti-debonding screw drilling tools for ultra-deep complex wells, which is used for the above-mentioned screw drilling tools, comprising the following steps:

[0024] Step 1: Add 25% polyurethane, 25% polyether, 15% high molecular weight polytrifluorochloroethylene, and 15% glass fiber with a diameter of 20-25 μm into a mixer according to the mass ratio, stir at a speed of 1500 r / min for 1 hour, add 4% zinc stearate lubricant, 6% bisphosphite antioxidant, 7% diphenyl phosphate plasticizer, and 3% cyclohexanone cosolvent after mixing evenly, mix at a roller temperature of 210°, mix for 2 hours, and make a motor lining;

[0025] Step 2: The inner wall of the stator metal shell is subjected to rust removal and sandblasting treatment. A groove with a length of 30 mm, a width of 5 mm, and a depth of 5 mm is symmetrically milled longitudinally on the inner wall of the stator metal shell every 500 mm. The plasticized molten high-density material is injected into the cavity between the mold core and the inner wall of the stator shell. The synthetic material entering the multiple grooves inside the stator is condensed and implanted into the inner wall of the stator.

[0026] Step 3: Assemble the motor assembly;

[0027] Step 4: Assemble the bypass valve assembly, the motor assembly, the universal shaft assembly and the transmission shaft assembly to obtain the screw drill tool body.

[0028] The beneficial effects of the present invention are:

[0029] 1. The main component of the synthetic stator lining is not made of traditional rubber materials or rubber synthetic materials, but high-density synthetic materials. Its main components are polyurethane and polyether, which are excellent high-performance elastomeric materials. They not only have good toughness, but also have good mechanical properties, high tensile strength and peel strength, and excellent oxidation resistance and high temperature resistance. Polytrifluorochloroethylene is a high-performance thermoplastic resin with high stability and heat resistance. Its melting temperature is greater than 213°C, its tensile strength is 3.1-4.2MPa, and it is acid, alkali and sulfur resistant. Glass fiber is a high-strength material. After being blended with polyurethane and polytrifluorochloroethylene, the shear strength and peel strength of the mixture are greatly increased, and the mechanical strength, oxidation stability and thermal stability are better. It can be safely used at high temperatures of 200° and in strong corrosion wells, and the stator lining will not peel off or fall off.

[0030] 2. When the screw drill is in use, the first locking mechanism and the second locking mechanism cooperate to realize a self-locking operation based on the threaded connection, which effectively avoids the loosening and falling off of the connecting buckles of the drill components compared with the prior art, thereby improving the safety of actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of the anti-slipping and anti-debonding screw drilling tool for ultra-deep and complex wells proposed by the present invention;

[0032] Figure 2 for Figure 1 A magnified schematic diagram of point A;

[0033] Figure 3 for Figure 1 A schematic diagram of the enlarged structure at B;

[0034] Figure 4 is a schematic diagram of the three-dimensional structure of the first rotating ring;

[0035] Figure 5 It is a schematic diagram of the connection between the first limit block and the first spring.

[0036] In the figure: 1 transmission shaft assembly, 2 cardan shaft assembly, 3 motor assembly, 4 bypass valve assembly, 5 first connecting cylinder, 6 second connecting cylinder, 7 second internal thread layer, 8 first annular groove, 9 first internal thread layer, 10 first external thread layer, 11 first rectangular groove, 12 first spring, 13 first limit block, 14 first limit groove, 15 second annular groove, 16 first rotating ring, 17 first magnetic block, 18 first rubber layer, 19 second external thread layer, 20 third annular groove, 21 second rectangular groove, 22 second spring, 23 second limit block, 24 second limit groove, 25 fourth annular groove, 26 second rotating ring, 27 second magnetic block, 28 second rubber layer. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] Reference Figure 1-5 The ultra-deep and complex well anti-slip and anti-debonding screw drilling tool comprises a transmission shaft assembly 1, a universal shaft assembly 2, a motor assembly 3 and a bypass valve assembly 4. The transmission shaft assembly 1, the universal shaft assembly 2, the motor assembly 3 and the bypass valve assembly 4 are arranged in sequence from left to right. The motor assembly 3 and the bypass valve assembly 4 are fixedly connected. The first connecting mechanism is also included. The first connecting mechanism is used to connect the transmission shaft assembly 1 and the universal shaft assembly 2. The first connecting mechanism includes a first connecting cylinder 5 fixedly connected to the left side of the universal shaft assembly 2. A first annular groove 8 is opened on the right side of the transmission shaft assembly 1, and a first annular groove 8 is opened on the inner wall of the first annular groove 8. An internal thread layer 9, a first external thread layer 10 is provided on the outer side of the first connecting tube 5, the first internal thread layer 9 cooperates with the first external thread layer 10, and also includes a second connecting mechanism, the second connecting mechanism is used to connect the cardan shaft assembly 2 and the motor assembly 3, the second connecting mechanism includes a second connecting tube 6 fixedly connected to the right side of the cardan shaft assembly 2, a third annular groove 20 is provided on the left side of the motor assembly 3, a second external thread layer 19 is provided on the outer side of the second connecting tube 6, a second internal thread layer 7 is provided on the inner side of the third annular groove 20, the second external thread layer 19 cooperates with the second internal thread layer 7, and also includes a first lock The first locking mechanism cooperates with the first connecting mechanism to ensure the tightness of the connection between the transmission shaft assembly 1 and the universal shaft assembly 2. The first locking mechanism includes a first limiting groove 14 symmetrically arranged on the inner wall of the first annular groove 8. Two first rectangular grooves 11 are symmetrically arranged on the outer side of the first connecting cylinder 5. The two first rectangular grooves 11 are each provided with a first limiting block 13 that can slide up and down. The opposite sides of the two first limiting blocks 13 are elastically connected to the inner wall of the corresponding first rectangular groove 11 through a first spring 12. Each first limiting block 13 cooperates with the corresponding first limiting groove 14. The second locking mechanism is included, and the second locking mechanism cooperates with the second connecting mechanism to ensure the tightness of the connection between the universal joint shaft assembly 2 and the motor assembly 3. The second locking mechanism includes two second limit grooves 24 symmetrically arranged on the inner wall of the third annular groove 20, and two second rectangular grooves 21 are symmetrically arranged on the outer side of the second connecting cylinder 6. The two second rectangular grooves 21 are each provided with a second limit block 23 that can slide up and down, and the opposite sides of the two second limit blocks 23 are elastically connected to the inner wall of the corresponding second rectangular groove 21 through a second spring 22. The first limit block 13 and the second limit block 23 are both wedge-shaped blocks.

[0039] A second annular groove 15 is provided on the outer side of the transmission shaft assembly 1, and a first rotating ring 16 is rotatably connected in the second annular groove 15. A first rubber layer 18 is provided on the inner side of the first rotating ring 16, and two first magnetic blocks 17 are symmetrically embedded in the first rotating ring 16. A fourth annular groove 25 is provided on the outer side of the motor assembly 3, and a second rotating ring 26 is rotatably connected in the fourth annular groove 25. A second rubber layer 28 is provided on the inner side of the second rotating ring 26, and two second magnetic blocks 27 are symmetrically embedded on the inner wall of the second rotating ring 26. Each of the first limit block 13 and the second limit block 23 is magnetic, and the adjacent surfaces of the corresponding first magnetic block 17 and the second magnetic block 27 are isotropically repelling.

[0040] When the transmission shaft assembly 1 and the universal shaft assembly 2 are connected, the transmission shaft assembly 1 only needs to be brought close to the universal shaft assembly 2. The inclined surface of the first limit block 13 is pushed, allowing it to enter the first rectangular groove 11. With the cooperation of the first internal thread layer 9 and the first external thread layer 10, the first connecting tube 5 can be screwed into the first annular groove 8. When it is screwed to the limit position, the first limit block 13 just corresponds to the first limit groove 14. Under the elastic action of the first spring 12, the first limit block 13 is inserted into the first rectangular groove 11. In a limit groove 14, self-locking is completed, and similarly, the universal joint assembly 2 and the motor assembly 3 can be self-lockingly connected; when disassembly is required, the corresponding first rotating ring 16 or the second rotating ring 26 can be rotated to make the first magnetic block 17 or the second magnetic block 27 correspond to the first limit block 13 and the second magnetic block 27. Under the action of repulsive force, the first limit block 13 will enter the first rectangular groove 11, and the second limit block 23 will enter the second rectangular groove 21. At this time, they can be rotated in opposite directions to achieve disassembly.

[0041] The present invention also discloses a processing technology for an anti-slipping and anti-debonding screw drill tool for ultra-deep and complex wells, which is used for the above-mentioned screw drill tool and comprises the following steps:

[0042] Step 1: According to the mass ratio, add 20-25% polyurethane, 25-30% polyether, 15-20% high molecular weight polytrifluorochloroethylene, and 10-15% direct 20-25μm glass fiber into a mixer, stir at 1500r / min for 1h, and after mixing evenly, add 4-6% zinc stearate lubricant, 5-6% diphosphite antioxidant, 7-8% diphenyl phosphate plasticizer, and 2-3% cyclohexanone cosolvent for mixing. The roller temperature is 190-210°, and the mixing is carried out for 2h to make the motor lining. Since polyurethane is an elastomeric material, the synthetic bushing that replaces rubber also has the high elasticity of the rubber lining, which can fully ensure the meshing of the motor under the best interference condition. Polyether ester has both good toughness and excellent elasticity, and excellent high temperature and oxidation resistance, which can ensure that the synthetic stator lining will not age in the high temperature and strong corrosive oil well environment. Chemical, shedding, polytrifluorochloroethylene, tensile strength of 2.1-4.2MPa, with high stability, heat resistance, acid resistance, alkali resistance, sulfur resistance, in the strong corrosion well conditions can ensure that the stator lining will not age, corrode and fall off, diphenyl phosphate plasticizer can effectively improve the flexibility and ductility of the synthetic body, bisphosphite antioxidant can improve the corrosion resistance of the synthetic body, the addition of cyclohexanone can make a variety of polymer materials fully mixed and dissolved with glass fiber, after repeated tests, the new synthetic body material at 200 ℃ temperature and strong corrosion environment, breaking strength 490-500Kg / cm2, breaking permanent deformation <6%, tear strength 48-50KN / m, peel strength 32-35KN / m, low shrinkage, about 0.5%, small thermal expansion, high thermal deformation temperature, can be used safely for a long time in the well temperature 200 ° environment, strong acid, strong alkali, high sulfur content performance is much higher than the traditional rubber lining, and can be produced at low cost;

[0043] Step 2: The inner wall of the stator metal shell is subjected to rust removal and sandblasting treatment. A groove with a length of 30 mm, a width of 5 mm, and a depth of 5 mm is symmetrically milled longitudinally on the inner wall of the stator metal shell every 500 mm. The plasticized molten high-density material is injected into the cavity between the mold core and the inner wall of the stator shell. The synthetic material entering the multiple grooves inside the stator is condensed and implanted into the inner wall of the stator.

[0044] Step 3: Assemble the motor assembly 3;

[0045] Step 4: Assemble the bypass valve assembly 4, the motor assembly 3, the universal shaft assembly 2 and the transmission shaft assembly 1 to obtain the screw drill tool body.

[0046] Embodiment 1:

[0047] The processing technology of the anti-slipping and anti-debonding screw drilling tool for ultra-deep and complex wells includes the following steps:

[0048] Step 1: Add 20% polyurethane, 30% polyether, 20% high molecular weight polytrifluorochloroethylene, and 10% glass fiber with a diameter of 20-25 μm into a mixer according to the mass ratio, stir at a speed of 1500 r / min for 1 hour, add 5% zinc stearate lubricant, 5% bisphosphite antioxidant, 8% diphenyl phosphate plasticizer, and 2% cyclohexanone cosolvent after mixing evenly, mix at a roller temperature of 200°, mix for 2 hours, and make a motor lining;

[0049] Step 2: The inner wall of the stator metal shell is subjected to rust removal and sandblasting treatment. A groove with a length of 30 mm, a width of 5 mm, and a depth of 5 mm is symmetrically milled longitudinally on the inner wall of the stator metal shell every 500 mm. The plasticized molten high-density material is injected into the cavity between the mold core and the inner wall of the stator shell. The synthetic material entering the multiple grooves inside the stator is condensed and implanted into the inner wall of the stator.

[0050] Step 3: Assemble the motor assembly 3;

[0051] Step 4: Assemble the bypass valve assembly 4, the motor assembly 3, the universal shaft assembly 2 and the transmission shaft assembly 1 to obtain the screw drill tool body.

[0052] Embodiment 2:

[0053] The processing technology of the anti-slipping and anti-debonding screw drilling tool for ultra-deep and complex wells includes the following steps:

[0054] Step 1: Add 25% polyurethane, 25% polyether, 15% high molecular weight polytrifluorochloroethylene, and 15% glass fiber with a diameter of 20-25 μm into a mixer according to the mass ratio, stir at a speed of 1500 r / min for 1 hour, add 4% zinc stearate lubricant, 6% bisphosphite antioxidant, 7% diphenyl phosphate plasticizer, and 3% cyclohexanone cosolvent after mixing evenly, mix at a roller temperature of 210°, mix for 2 hours, and make a motor lining;

[0055] Step 2: The inner wall of the stator metal shell is subjected to rust removal and sandblasting treatment. A groove with a length of 30 mm, a width of 5 mm, and a depth of 5 mm is symmetrically milled longitudinally on the inner wall of the stator metal shell every 500 mm. The plasticized molten high-density material is injected into the cavity between the mold core and the inner wall of the stator shell. The synthetic material entering the multiple grooves inside the stator is condensed and implanted into the inner wall of the stator.

[0056] Step 3: Assemble the motor assembly 3;

[0057] Step 4: Assemble the bypass valve assembly 4, the motor assembly 3, the universal shaft assembly 2 and the transmission shaft assembly 1 to obtain the screw drill tool body.

[0058] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Anti-slip and anti-debonding screw drilling tools for ultra-deep and complex wells, characterized by: include: A transmission shaft assembly (1), a universal shaft assembly (2), a motor assembly (3) and a bypass valve assembly (4), wherein the transmission shaft assembly (1), the universal shaft assembly (2), the motor assembly (3) and the bypass valve assembly (4) are arranged in sequence from left to right, and the motor assembly (3) and the bypass valve assembly (4) are fixedly connected; a first connecting mechanism, wherein the first connecting mechanism is used to connect the transmission shaft assembly (1) and the universal shaft assembly (2), and the first connecting mechanism comprises a first connecting cylinder (5) fixedly connected to the left side of the universal shaft assembly (2); a first annular groove (8) is provided on the right side of the transmission shaft assembly (1), and the first annular groove (8) A first internal thread layer (9) is provided on the inner wall of the first connecting tube (5), a first external thread layer (10) is provided on the outer side of the first connecting tube (5), the first internal thread layer (9) cooperates with the first external thread layer (10); a second connecting mechanism, the second connecting mechanism is used to connect the universal shaft assembly (2) and the motor assembly (3); a first locking mechanism, the first locking mechanism cooperates with the first connecting mechanism, and is used to ensure the tightness of the connection between the transmission shaft assembly (1) and the universal shaft assembly (2); a second locking mechanism, the second locking mechanism cooperates with the second connecting mechanism, and is used to ensure the tightness of the connection between the universal shaft assembly (2) and the motor assembly (3).

2. The anti-slip and anti-debonding screw drilling tool for ultra-deep and complex wells according to claim 1 is characterized in that: The second connecting mechanism comprises a second connecting tube (6) fixedly connected to the right side of the universal shaft assembly (2); a third annular groove (20) is provided on the left side of the motor assembly (3); a second external thread layer (19) is provided on the outer side of the second connecting tube (6); a second internal thread layer (7) is provided on the inner side of the third annular groove (20); and the second external thread layer (19) cooperates with the second internal thread layer (7).

3. The anti-slip and anti-debonding screw drilling tool for ultra-deep and complex wells according to claim 2 is characterized in that: The first locking mechanism comprises a first limiting groove (14) symmetrically provided on the inner wall of the first annular groove (8), two first rectangular grooves (11) symmetrically provided on the outer side of the first connecting tube (5), a first limiting block (13) slidable up and down is provided in each of the two first rectangular grooves (11), and opposite sides of the two first limiting blocks (13) are elastically connected to the inner wall of the corresponding first rectangular groove (11) via a first spring (12).

4. The anti-slip and anti-debonding screw drilling tool for ultra-deep and complex wells according to claim 3 is characterized in that: Each of the first limiting blocks (13) cooperates with a corresponding first limiting groove (14).

5. The anti-slip and anti-debonding screw drilling tool for ultra-deep and complex wells according to claim 3 is characterized in that: The second locking mechanism comprises two second limiting grooves (24) symmetrically arranged on the inner wall of the third annular groove (20); the outer side of the second connecting tube (6) is symmetrically arranged with two second rectangular grooves (21); the two second rectangular grooves (21) are each provided with a second limiting block (23) which can slide up and down; the opposite sides of the two second limiting blocks (23) are elastically connected to the inner wall of the corresponding second rectangular groove (21) via a second spring (22).

6. The anti-slip and anti-debonding screw drilling tool for ultra-deep and complex wells according to claim 5, characterized in that: The first limiting block (13) and the second limiting block (23) are both wedge-shaped blocks.

7. The anti-slip and anti-debonding screw drilling tool for ultra-deep and complex wells according to claim 5, characterized in that: The transmission shaft assembly (1) is provided with a second annular groove (15) on the outside, a first rotating ring (16) is rotatably connected in the second annular groove (15), a first rubber layer (18) is provided on the inside of the first rotating ring (16), two first magnetic blocks (17) are symmetrically embedded in the first rotating ring (16), the motor assembly (3) is provided with a fourth annular groove (25) on the outside, a second rotating ring (26) is rotatably connected in the fourth annular groove (25), a second rubber layer (28) is provided on the inside of the second rotating ring (26), two second magnetic blocks (27) are symmetrically embedded on the inner wall of the second rotating ring (26), and each of the first limit block (13) and the second limit block (23) is magnetic.

8. A process for processing a screw drill tool for ultra-deep and complex wells to prevent debonding and disbonding, used for processing the screw drill tool according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Add 20-25% polyurethane, 25-30% polyether, 15-20% high molecular weight polytrifluorochloroethylene, and 10-15% direct 20-25μm glass fiber into a mixer according to the mass ratio, stir at 1500r / min for 1h, add 4-6% zinc stearate lubricant, 5-6% diphosphite antioxidant, 7-8% diphenyl phosphate plasticizer, and 2-3% cyclohexanone cosolvent after mixing evenly, mix at a roller temperature of 190-210°, mix for 2h, and make a motor lining; Step 2: The inner wall of the stator metal shell is subjected to rust removal and sandblasting treatment. A groove with a length of 30 mm, a width of 5 mm, and a depth of 5 mm is symmetrically milled longitudinally on the inner wall of the stator metal shell every 500 mm. The plasticized molten high-density material is injected into the cavity between the mold core and the inner wall of the stator shell. The synthetic material entering the multiple grooves inside the stator is condensed and implanted into the inner wall of the stator. Step 3: Assemble the motor assembly (3); Step 4: Assemble the bypass valve assembly (4), the motor assembly (3), the universal shaft assembly (2) and the transmission shaft assembly (1) to obtain the screw drill body.

9. The processing technology of the anti-slipping and anti-debonding screw drilling tool for ultra-deep and complex wells according to claim 8 is characterized in that: The following steps are involved: Step 1: Add 20% polyurethane, 30% polyether, 20% high molecular weight polytrifluorochloroethylene, and 10% glass fiber with a diameter of 20-25μm into a mixer according to the mass ratio, stir at a speed of 1500r / min for 1h, add 5% zinc stearate lubricant, 5% diphosphite antioxidant, 8% diphenyl phosphate plasticizer, and 2% cyclohexanone cosolvent after mixing evenly, mix at a roller temperature of 200°, mix for 2h, and make a motor lining; Step 2: The inner wall of the stator metal shell is subjected to rust removal and sandblasting treatment. A groove with a length of 30 mm, a width of 5 mm, and a depth of 5 mm is symmetrically milled longitudinally on the inner wall of the stator metal shell every 500 mm. The plasticized molten high-density material is injected into the cavity between the mold core and the inner wall of the stator shell. The synthetic material entering the multiple grooves inside the stator is condensed and implanted into the inner wall of the stator. Step 3: Assemble the motor assembly (3); Step 4: Assemble the bypass valve assembly (4), the motor assembly (3), the universal shaft assembly (2) and the transmission shaft assembly (1) to obtain the screw drill body.

10. The processing technology of the anti-slipping and anti-debonding screw drilling tool for ultra-deep and complex wells according to claim 8 is characterized in that: The following steps are involved: Step 1: Add 25% polyurethane, 25% polyether, 15% high molecular weight polytrifluorochloroethylene, and 15% glass fiber with a diameter of 20-25μm into a mixer according to the mass ratio, stir at a speed of 1500r / min for 1h, add 4% zinc stearate lubricant, 6% diphosphite antioxidant, 7% diphenyl phosphate plasticizer, and 3% cyclohexanone cosolvent after mixing evenly, mix at a roller temperature of 210°, mix for 2h, and make the motor lining; Step 2: The inner wall of the stator metal shell is subjected to rust removal and sandblasting treatment. A groove with a length of 30 mm, a width of 5 mm, and a depth of 5 mm is symmetrically milled longitudinally on the inner wall of the stator metal shell every 500 mm. The plasticized molten high-density material is injected into the cavity between the mold core and the inner wall of the stator shell. The synthetic material entering the multiple grooves inside the stator is condensed and implanted into the inner wall of the stator. Step 3: Assemble the motor assembly (3); Step 4: Assemble the bypass valve assembly (4), the motor assembly (3), the universal shaft assembly (2) and the transmission shaft assembly (1) to obtain the screw drill body.

Images