Multifunctional whipstock

Abstract

The present application relates to the technical field of drilling, and especially relates to a multifunctional whipstock, which aims to alleviate the technical problem that the window tool needs to be repositioned and oriented after being lowered into after whipstocking in the related art. The multifunctional whipstock comprises a packer anchoring assembly, a fishing assembly, a double-liquid cylinder assembly and a whipstocking assembly; the packer anchoring assembly is sleeved on the base pipe of the fishing assembly and connected with the fishing assembly; the double-liquid cylinder assembly is connected with the packer anchoring assembly and sleeved on the base pipe and communicated with the base pipe, and the double-liquid cylinder assembly is configured to move along the axial direction of the base pipe towards the fishing assembly under the pressing working condition to extrude the slip assembly of the packer anchoring assembly; the fishing assembly is sleeved on the whipstocking assembly, and the two are connected through a snap pin and also connected through an elastic thread structure, and the elastic thread structure is configured to be threadedly uncoupled under the pressurizing working condition. The multifunctional whipstock integrates the anchoring and whipstocking functions, and the tools for realizing the two functions can be respectively recovered, thereby reducing the operation difficulty and construction cost.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, and more particularly to a multifunctional directional drilling tool. Background Technology

[0002] Currently, existing directional drilling tools only serve to create directional boreholes. When dealing with complex branch well operations, in order to connect the main borehole and the branch borehole, it is necessary to first retrieve all the directional drilling tools from the well, and then run the window tool. The run-in window tool needs to be repositioned and oriented, which increases the difficulty of the operation and the construction cost. Summary of the Invention

[0003] The purpose of this invention is to provide a multifunctional skewing tool to alleviate the technical problem in related technologies where the window tool that is lowered after skewing needs to be repositioned and oriented.

[0004] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows: The multi-functional directional device provided by the present invention includes: a sealing and anchoring assembly, a retrieval assembly, a dual-cylinder assembly, and a directional device assembly, wherein the sealing and anchoring assembly includes a slip assembly, and the retrieval assembly includes a base pipe communicating with the directional device assembly; The sealing and anchoring assembly is sleeved on the base pipe and connected to the salvage assembly via a variable coupling. The dual-cylinder assembly is connected to the sealing and anchoring assembly and is sleeved on the base tube. It is also connected to the base tube through a flow hole. The dual-cylinder assembly is configured to move along the axial direction of the base tube toward the retrieval assembly under pressure conditions to squeeze the slip assembly. The salvage assembly is mounted on the skewing assembly, and the two are connected by a snap pin and also by an elastic thread structure. The elastic thread structure is configured to disengage the thread under pressurized conditions.

[0005] Furthermore, the dual-cylinder assembly includes a locking block sleeve, an upper cylinder, a lower cylinder, and a cylinder locking ring; The locking block sleeve is connected to the sealing and anchoring assembly, and also to the upper liquid cylinder; The lower liquid cylinder is connected to the end of the upper liquid cylinder away from the locking block sleeve; The cylinder locking ring is embedded between the lower cylinder and the base tube, and a toothed buckle structure is provided between the locking ring and the base tube; The flow passage is provided in multiple sets, and the base tube is connected to the upper liquid cylinder and the lower liquid cylinder respectively through the multiple sets of flow passages.

[0006] Furthermore, the dual-cylinder assembly also includes a locking block and a locking block limiting sleeve; The locking block is located at the flow hole communicating with the upper liquid cylinder, and is inserted into the base tube through the locking block; The locking block limiting sleeve is fitted onto the locking block and connected to the locking block by shear pins.

[0007] Furthermore, the slip assembly includes an upper cone, a slip cover, a lower cone, a slip, and a cone locking ring; The upper cone is connected to the variable snap joint; The lower cone and the upper cone are spaced apart, and the lower cone is located at the end of the upper cone that is furthest from the variable snap joint; The clasp is connected between the upper cone and the lower cone, and together with the upper cone and the lower cone, forms an accommodating space; The clasp is disposed within the accommodating space; The cone locking ring is embedded between the lower cone and the base tube, and a toothed buckle structure is provided between the ring and the base tube.

[0008] Furthermore, the sealing and anchoring assembly also includes a rubber sleeve shaft, an end rubber sleeve, a middle rubber sleeve, and a spacer ring; The rubber sleeve shaft is connected between the slip assembly and the dual hydraulic cylinder assembly; Both the end rubber sleeve and the middle rubber sleeve are sleeved on the rubber sleeve shaft; The spacer ring is sleeved on the rubber tube shaft and is located between the adjacent end rubber tube and the middle rubber tube.

[0009] Furthermore, the skewer assembly includes a central tube and a piston and a single-flow ball valve connected to the central tube; The central tube passes through the base tube, and the central tube has a through hole on its wall between the piston and the single-flow ball valve; Both the piston and the single-flow ball valve are positioned between the central tube and the base tube to respectively block the openings at both ends of the base tube.

[0010] Furthermore, the skewer assembly also includes a reverse-locking claw spring limiting sleeve and a reverse-locking claw spring, and the retrieval assembly also includes a retrieval claw spring; The reverse-locking claw spring limiting sleeve is fitted onto the central tube; The piston is connected to the central tube via a piston shear pin and is positioned close to the reverse claw spring limiting sleeve; The reverse claw spring is sleeved on the reverse claw spring limiting sleeve and connected to the reverse claw spring limiting sleeve through a limiting sleeve shear pin; The retrieval claw spring is sleeved on the reverse claw spring and the base tube, and is threadedly connected to the reverse claw spring and the base tube respectively.

[0011] Furthermore, the tilting assembly also includes a limiting locking ring; The limiting sleeve locking ring is embedded between the reverse claw spring limiting sleeve and the central tube, and a toothed buckle structure is provided between the locking sleeve and the central tube.

[0012] Furthermore, the tilting assembly also includes an upper connector, a feed rod, a connecting short section, a straightening ring, a force transmission key, a straightening plate, a window-opening guide slope, a chip-bearing cup, a torque transmission short section, and a torque transmission key. The salvage assembly also includes a directional sealing return cylinder sleeved on the torque transmission short section. The upper connector is connected to one end of the feeding rod, and the other end of the feeding rod is threadedly connected to the connecting short section; From the upper connector to the direction away from the upper connector, the straightening ring and the force transmission key are sequentially arranged on the feeding rod, wherein the straightening ring is sleeved on the feeding rod, and the force transmission key is fixedly connected to the feeding rod; The straightening plate is sleeved on the feeding rod and connected to the straightening ring by a pin; The window opening guide ramp is connected between the straightening plate and the feeding rod, and is also connected to the connecting short section; The chip-receiving cup is fixedly sleeved on the connecting short section; The end of the connecting section away from the window guide slope is connected to the torsion transmission section, and a filter is provided between the connecting section and the torsion transmission section; The directional sealing return sleeve is fitted onto the torque transmission short section. The torque transmission key is fixed to the torque transmission short section and is located in the keyway of the directional sealing return cylinder; The locking pin is fixed to the torsion transmission short section and engages with the directional sealing return cylinder.

[0013] Furthermore, the directional sealing return cylinder is equipped with a long sealing smooth surface and a locking ring step.

[0014] In summary, the technical effects achieved by the multifunctional slant device provided by this invention are as follows: The multifunctional directional controller provided by this invention includes a sealing and anchoring assembly, a retrieval assembly, a dual-cylinder assembly, and a directional control assembly. The sealing and anchoring assembly includes a slip assembly, and the retrieval assembly includes a base tube communicating with the directional control assembly. The sealing and anchoring assembly is fitted onto the base tube and connected to the retrieval assembly via a variable-thread connector. The dual-cylinder assembly is connected to the sealing and anchoring assembly, fitted onto the base tube, and communicates with the base tube through a flow hole. The dual-cylinder assembly is configured to move axially toward the retrieval assembly along the base tube under pressure conditions to compress the slip assembly. The retrieval assembly is fitted onto the directional control assembly, and the two are connected by a pin and also by an elastic thread structure. The elastic thread structure is configured to disengage under pressure conditions.

[0015] In practical applications, the upper end of the directional assembly is connected to the directional connector, and the lower end is connected to the guide shoe or tailpipe. When the multi-functional directional device is sent into the wellbore using a drill string, no grouting is required during the lowering process. After reaching the designed position, the gyroscope is measured and the orientation is determined before connecting to a cement truck for pressure testing. The injected liquid flows into the base pipe through the directional assembly and then flows into the dual-cylinder assembly through the flow hole. Under the action of hydraulic pressure, the dual-cylinder assembly moves upward and pushes the sealing and anchoring assembly. Since the sealing and anchoring assembly is connected to the fishing assembly through a variable-thread connector, that is, the end of the sealing and anchoring assembly away from the dual-cylinder assembly is fixed, the slip assembly expands outward under the pressure of the dual-cylinder assembly and bites the inner wall of the casing, thereby achieving anchoring. Continue increasing the hydraulic pressure until the threads break, meaning the threaded connection between the retrieval assembly and the directional drilling assembly is released. After the window drilling is completed, the directional drilling assembly can be selectively retrieved as needed. A special retrieval hook is lowered to hook the directional drilling assembly, and a certain load is applied to shear the locking pin. Since the elastic threaded connection is now released, the directional drilling assembly can be retrieved. The remaining assembly can then be connected to the newly lowered tool.

[0016] It can be seen that, compared with the existing technology, this multi-functional directional device has both directional and anchoring functions, and the relevant assemblies that realize the two functions can be retrieved separately, making it flexible in use and solving the technical problem that the window tool that is lowered after directional building needs to be repositioned and oriented. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A cross-sectional view of a multifunctional slant head provided in an embodiment of the present invention; Figures 2 to 7 for Figure 1 A schematic diagram of each segment from top to bottom.

[0019] Icons: 1-Upper connector; 2-Feeding rod; 3-Straightening plate; 4-Straightening ring; 5-Force transmission key; 6-Window guide ramp; 7-Connecting short section; 8-Chip bearing cup; 9-Limiting ring; 10-Torque transmission short section; 11-Filter plate; 12-Clamping pin; 13-Directional sealing return sleeve; 14-Torque transmission key; 15-Inner tube connecting short section; 16-Upper center tube; 17-Return sleeve coupling; 18-Retrieval short section; 19-Reverse locking claw spring; 20-Limiting sleeve locking ring; 21-Limiting sleeve shear pin; 22-Reverse locking claw spring limiting sleeve; 23-Retrieval claw spring limiting sleeve; 24-Retrieval limiting sleeve shear pin; 25-Retrieval claw spring; 26-Limiting key; 27-Base tube; 28 - Piston; 29- Piston shear pin; 30- Center tube coupling; 31- Variable thread connector; 32- Lower center tube; 33- Upper cone; 34- Pressure cap; 35- Slip cover; 36- Slip; 37- Lower cone; 38- Cone locking ring; 39- Support cap; 40- End rubber sleeve; 41- Middle rubber sleeve; 42- Spacer ring; 43- Rubber sleeve shaft; 44- Locking block sleeve; 45- Upper liquid cylinder; 46- Locking block; 47- Shear pin; 48- Locking block limiting sleeve; 49- Lower liquid cylinder; 50- Lower liquid cylinder limiting sleeve; 51- Movable connecting sleeve; 52- Ball valve sleeve; 53- Ball valve rubber sleeve; 54- Rubber sleeve spacer ring; 55- Liquid cylinder locking ring; 56- Ball seat; 57- Guide shoe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] Currently, existing directional drilling tools only serve to create directional boreholes. When dealing with complex branch well operations, in order to connect the main borehole and the branch borehole, it is necessary to first retrieve all the directional drilling tools from the well, and then run the window tool. The run-in window tool needs to be repositioned and oriented, which increases the difficulty of the operation and the construction cost.

[0024] In view of this, the present invention provides a multifunctional directional device, including a sealing and anchoring assembly, a retrieval assembly, a dual-cylinder assembly, and a directional device assembly. The sealing and anchoring assembly includes a slip assembly, and the retrieval assembly includes a base tube 27 communicating with the directional device assembly. The sealing and anchoring assembly is sleeved on the base tube 27 and connected to the retrieval assembly via a variable-thread connector 31. The dual-cylinder assembly is connected to the sealing and anchoring assembly and sleeved on the base tube 27, communicating with the base tube 27 through a flow hole. The dual-cylinder assembly is configured to move axially toward the retrieval assembly along the base tube 27 under pressure conditions to compress the slip assembly. The retrieval assembly is sleeved on the directional device assembly, and the two are connected by a locking pin 12 and an elastic threaded structure. The elastic threaded structure is configured to disengage under pressure conditions.

[0025] In practical applications, the upper end of the directional assembly is connected to the directional connector, and the lower end is connected to the guide shoe 57 or the tailpipe. When the multi-functional directional device is sent into the wellbore using a drill string, no grouting is required during the lowering process. After reaching the designed position, the gyroscope is measured and the orientation is determined before connecting to a cement truck for pressure testing. The injected liquid flows into the base pipe 27 through the directional assembly and then flows into the double hydraulic cylinder assembly through the flow hole. Under the action of hydraulic pressure, the double hydraulic cylinder assembly moves upward and pushes the sealing and anchoring assembly. Since the sealing and anchoring assembly is connected to the fishing assembly through the variable thread connector 31, that is, the end of the sealing and anchoring assembly away from the double hydraulic cylinder assembly is fixed, the slip assembly expands outward under the pressure of the double hydraulic cylinder assembly and bites the inner wall of the casing, thereby achieving anchoring. Continue increasing the hydraulic pressure until the threads are disengaged, meaning the threaded connection between the retrieval assembly and the directional drilling assembly is released. After the window drilling is completed, the directional drilling assembly can be selectively retrieved as needed. A special retrieval hook is lowered to hook the directional drilling assembly, and a certain load is applied. The locking pin 12 is sheared, and since the elastic threaded connection is now released, the directional drilling assembly can be retrieved. The remaining assembly can then be connected to the newly lowered tool.

[0026] It can be seen that, compared with the existing technology, this multi-functional directional device has both directional and anchoring functions, and the relevant assemblies that realize the two functions can be retrieved separately, making it flexible in use and solving the technical problem that the window tool that is lowered after directional building needs to be repositioned and oriented.

[0027] The following combination Figures 1 to 7 The structure and shape of the multifunctional slant provided in this embodiment will be described in detail: Furthermore, the dual-cylinder assembly includes a locking block sleeve 44, an upper cylinder 45, a lower cylinder 49, and a cylinder locking ring 55; the locking block sleeve 44 is connected to the sealing and anchoring assembly and also to the upper cylinder 45; the lower cylinder 49 is connected to the end of the upper cylinder 45 away from the locking block sleeve 44; the cylinder locking ring 55 is embedded between the lower cylinder 49 and the base tube 27, and a toothed buckle structure is provided between it and the base tube 27; multiple sets of flow holes are provided, and the base tube 27 is connected to the upper cylinder 45 and the lower cylinder 49 through multiple sets of flow holes respectively.

[0028] Specifically, the locking block sleeve 44 has three locking block slots and three sets of shear pin holes for installing locking blocks 46 and shear pins 47, respectively. The locking block 46 is inserted into the locking block sleeve 44 and recessed into the groove in the base tube 27 for placing the locking block 46, connecting the locking block sleeve 44 and the base tube 27 together. The locking block limiting sleeve 48 is fitted into the locking block sleeve 44 and fixed with shear pins 47. A limiting ring and a limiting ring are installed on the base tube 27 to limit the stroke of the locking block limiting sleeve 48. The locking block sleeve 44 is threaded to the rubber sleeve shaft 43 and the upper liquid cylinder 45, respectively. The upper liquid cylinder 45 is threaded to the lower liquid cylinder 49. The lower liquid cylinder limiting sleeve 50 is fitted inside the lower liquid cylinder 49, and a limiting ring and a limiting ring are installed on the base tube 27 to limit the movement of the lower liquid cylinder limiting sleeve 50. A liquid cylinder locking ring 55 is installed at the lower end of the lower liquid cylinder 49.

[0029] During application, liquid flows into the upper liquid cylinder 45 and the lower liquid cylinder 49 through the flow hole on the base tube 27. Under the action of hydraulic pressure, the shear pin 47 between the locking block limiting sleeve 48 and the locking block sleeve 44 is cut off. After the locking block limiting sleeve 48 moves downward for a sufficient stroke, the locking block 46 is forced to move outward and release the lock between the locking block sleeve 44 and the base tube 27. At the same time, the hydraulic pressure pushes the locking block sleeve 44 and the lower liquid cylinder 49 upward. Since the rubber sleeve shaft 43 is threadedly connected to the locking block sleeve 44, the locking block sleeve 44 moves upward along with the rubber sleeve shaft 43 and transmits the force to the slip assembly.

[0030] In one embodiment of this application, the slip assembly includes an upper cone 33, a slip cover 35, a lower cone 37, a slip 36, and a cone locking ring 38; the upper cone 33 is connected to a variable snap connector 31; the lower cone 37 is spaced apart from the upper cone 33 and is located at the end of the upper cone 33 away from the variable snap connector 31; the slip cover 35 is connected between the upper cone 33 and the lower cone 37, and together with the upper cone 33 and the lower cone 37, forms an accommodating space, and is limited by a threaded connection to a pressure cap 34; the slip 36 is disposed in the accommodating space and is pressed tightly by a spring; the cone locking ring 38 is embedded between the lower cone 37 and the base tube 27, and has a toothed snap structure between it and the base tube 27; the rubber sleeve shaft 43 is sleeved on the lower cone 37 and limited by a threaded connection to a support cap 39.

[0031] When the locking block sleeve 44 moves upward along with the rubber sleeve shaft 43, the force is transmitted to the lower cone 37, and the lower cone 37 begins to move upward. Since the upper cone 33 is connected to the anchoring system retrieval assembly through the variable buckle joint 31, the position of the upper cone 33 is fixed. The slip 36 extends outward along the inclined surfaces of the upper cone 33 and the lower cone 37, biting the inner wall of the sleeve to complete the anchoring function of the hanger. At this time, the cone locking ring 38 and the base tube 27 use the toothed buckle structure to lock the lower cone 37, preventing it from returning to its original position.

[0032] Furthermore, the sealing and anchoring assembly also includes a rubber sleeve shaft 43, an end rubber sleeve 40, a middle rubber sleeve 41, and a spacer ring 42; the rubber sleeve shaft 43 is connected between the slip assembly and the dual hydraulic cylinder assembly; the end rubber sleeve 40 and the middle rubber sleeve 41 are both sleeved on the rubber sleeve shaft 43; the spacer ring 42 is sleeved on the rubber sleeve shaft 43 and is located between the adjacent end rubber sleeve 40 and the middle rubber sleeve 41.

[0033] Specifically, when the locking sleeve 44 moves upward along with the rubber tube shaft 43, the locking sleeve 44 pushes the end rubber tube 40 and the middle rubber tube 41, causing them to expand outward and complete the sealing function. At this time, the cylinder locking ring 55 and the base tube 27 installed in the lower cylinder 49 lock the double cylinder assembly through the toothed buckle structure, thereby preventing return to position.

[0034] Furthermore, the skewer assembly includes a central tube and a piston 28 and a one-way ball valve connected to the central tube; the central tube passes through the base tube 27, and the wall of the central tube is provided with a through hole between the piston 28 and the one-way ball valve; the piston 28 and the one-way ball valve are both located between the central tube and the base tube 27 to respectively block the openings at both ends of the base tube 27.

[0035] Specifically, in the skew assembly, the center tube is divided into an upper center tube 16 and a lower center tube 32. The upper connector 1 is threadedly connected to the feed rod 2. The straightening ring 4 is fitted onto the feed rod 2 and connected to the straightening plate 3 with pins. The straightening plate 3 and the window guide ramp 6 are connected with multiple sets of pins. The window guide ramp 6 and the connecting short section 7 are threadedly connected. The feed rod 2 is inserted into the window guide ramp 6 and connected to the connecting short section 7 via a left-hand thread. The force transmission key 5 is welded to the corresponding position on the feed rod 2. A chip-bearing cup 8 is fitted onto the connecting short section 7 and limited by a limiting ring 9. The connecting short section 7 is then threaded onto the torque transmission short section 10. A filter 11 is placed between the two parts. A retaining pin 12 and a torque transmission key 14 are fixed to the torque transmission short section 10 with screws. Section 10 is connected to the inner tube via a threaded connection to the short section 15. The inner tube is connected to the short section 15 via a threaded connection to the upper central tube 16 and the reverse claw spring 19. The reverse claw spring limiting sleeve 22 is fitted with a limiting sleeve locking ring 20, which is then fitted onto the upper central tube 16 and connected to the reverse claw spring 19 with a limiting sleeve shear pin 21. The upper central tube 16 and the lower central tube 32 are connected by a central tube coupling 30. The piston 28 is connected to the central tube coupling 30 via a piston shear pin 29. The movable connecting sleeve 51 is fitted onto the lower central tube 32 and connected to the ball valve sleeve 52 via a thread. The ball valve sleeve 53 and the sleeve spacer 54 are fitted onto the ball valve sleeve 52. The ball seat 56 is connected to the ball valve sleeve 52 with a pin.

[0036] In the salvage assembly, the return sleeve coupling 17 is connected to the directional sealing return sleeve 13 and the salvage short section 18 by a thread. The salvage short section 18 is connected to the salvage claw spring 25 by a thread. The salvage claw spring limiting sleeve 23 is fitted on the salvage short section 18 and connected by the salvage limiting sleeve shear pin 24. The limiting key 26 is installed in the keyway of the salvage short section 18 and fixed together with the salvage claw spring 25 by screws. The lower end of the salvage short section 18 is connected to the sealing and anchoring assembly through the variable thread connector 31. The base tube 27 is connected to the salvage claw spring 25 by a thread. The salvage claw spring 25 also has a left-hand thread for connecting with the reverse thread claw spring 19 in the salvageable skewer assembly. The pin hole on the directional sealing return sleeve 13 is used to set the locking pin 12 in the salvageable skewer assembly.

[0037] As the hydraulic pressure continues to increase, the fluid inside the base tube 27 shears the piston shear pin 29, causing the piston 28 to move upward and push the reverse claw spring limiting sleeve 22 upward as well. After the reverse claw spring limiting sleeve 22 reaches its position and is locked by the limiting sleeve locking ring 20, the threaded claw of the reverse claw spring 19 loses its support and retracts inward under force, causing the thread to disengage. When the piston 28 is completely removed from the base tube 27, the seal inside the base tube 27 fails, and a pressure relief signal can be observed at the wellhead. This indicates that the multi-functional directional device setup is complete.

[0038] When the drill string rotates forward, the reverse engagement between the feed rod 2 and the connecting section 7 disengages, and the drill string is lifted to remove the upper connector 1 and the feed rod 2. At this time, the force transmission key 5 on the feed rod 2 will lift the centering ring 4 as well. Afterward, the window opening operation is performed. During the window opening process, the chip-collecting cup 8 and the filter 11 ensure that large pieces of debris will not affect the use of the tool. The torque transmission key 14 falls into the keyway of the directional sealing return cylinder 13, providing sufficient anti-torsional capacity for the window opening operation.

[0039] After the window-opening side drilling is completed, the directional drilling assembly can be selectively retrieved as needed. A special retrieval hook is lowered to the tool mounting position, hooking onto the retrieval hook groove of the window-opening guide slope 6. A certain load is applied, causing the locking pin 12 to shear off. At this point, the reverse-clamping claw spring 19 contracts and disengages, allowing the directional drilling assembly to be retrieved. If lowering the special retrieval hook is unsuccessful, a retrieval spear can be lowered to retrieve the through hole of the window-opening guide slope 6. After grasping the window-opening guide slope 6, the directional drilling assembly can be retrieved by lifting it upwards.

[0040] After the directional drilling assembly is separated, when other branch well tools need to be accurately oriented and reconnected, simply install a positioning key with a width slightly smaller than the keyway of the directional sealing reconnection cylinder 13 at the required location. The directional sealing reconnection cylinder 13 can guide the positioning key into the keyway to achieve accurate orientation. The directional sealing reconnection cylinder 13 is also designed with a long sealing smooth surface, a pin hole that cooperates with the pin mechanism, and a locking ring step that cooperates with the locking ring mechanism, so as to meet the reconnection requirements of various tools.

[0041] The multi-functional angled device can also selectively retrieve and recover the anchoring components. Specifically, the lower special retrieval spear engages with the retrieval claw spring limiting sleeve 23, and a certain pulling force is applied to shear the retrieval limiting sleeve shear pin 24, thus releasing the claw spring limiting sleeve 23 and releasing the retrieval claw spring 25 from its restriction. When the retrieval claw spring limiting sleeve 23 is raised to the position of the return sleeve coupling 17, the upward force is transmitted to the retrieval short section 18. The retrieval claw spring 25 and the retrieval short section 18 are connected by elastic threaded claws. When subjected to force, the elastic threaded claws will contract inward, causing the connection to fail. At this time, the retrieval short section 18 can continue to be raised, moving upwards along with the upper cone 33, the slip cover 35, the lower cone 37, and the rubber sleeve shaft 43. The slip 36 loses the support of the cone and retracts under the action of the spring force. The stroke of the rubber sleeve shaft 43 compressing the rubber sleeve is released when the lower cone 37 moves upwards, and the end rubber sleeve 40 and the middle rubber sleeve 41 retract. At this time, the remaining assembly can be retrieved.

[0042] As can be seen, this multi-functional directional drilling device has a directional drilling system and an anchoring system for directional drilling and anchoring respectively. Both systems can be retrieved separately, offering flexible usage. The directional drilling system is designed with two retrieval methods to ensure a high retrieval success rate. This multi-functional directional drilling device is easy to operate, enabling one-trip drilling, setting, sealing, verification, and release operations. The anchoring system is designed with a sealing reconnection device, which can reconnect various types of tools and accurately orient them, meeting the requirements of complex branch well construction processes. The anchoring system integrates suspension and isolation functions, and is designed with a high-pressure sealing sleeve, a two-way cone, and anti-rotation and anti-skid slips to meet the needs of various operations. The anchoring system is designed with a dual hydraulic cylinder assembly, which improves the hydraulic driving force and enhances the anchoring capacity and sealing performance of the hanger. In addition, this multi-functional directional drilling device can be run in independently or used to suspend the tailpipe, making it ideal for use in branch wells and sidetracking wells. Furthermore, it can also be used for well completion operations in vertical wells, deviated wells, horizontal wells, and extended reach wells.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multifunctional slant driver, characterized in that, include: The assembly includes a sealing and anchoring assembly, a salvage assembly, a dual-cylinder assembly, and a directional tilting assembly, wherein the sealing and anchoring assembly includes a slip assembly, and the salvage assembly includes a base pipe (27) connected to the directional tilting assembly. The sealing and anchoring assembly is sleeved on the base pipe (27) and connected to the salvage assembly through a variable coupling (31); The dual-cylinder assembly is connected to the sealing and anchoring assembly and is sleeved on the base tube (27). It is also connected to the base tube (27) through the flow hole on the base tube (27). The dual-cylinder assembly is configured to move along the axial direction of the base tube (27) toward the salvage assembly under the pressure condition to squeeze the slip assembly. The salvage assembly is fitted onto the skewing assembly, and the two are connected by a locking pin (12) and also by an elastic thread structure, which is configured to disengage the thread under pressurized conditions. The skewer assembly includes a central tube and a piston (28) and a single-flow ball valve connected to the central tube; The central tube passes through the base tube (27), and the wall of the central tube is provided with a through hole between the piston (28) and the single-flow ball valve; The piston (28) and the single-flow ball valve are both disposed between the central tube and the base tube (27) to respectively block the openings at both ends of the base tube (27); The skewing assembly also includes a reverse-locking claw spring limiting sleeve (22) and a reverse-locking claw spring (19), and the salvage assembly also includes a salvage claw spring (25). The reverse-locking claw spring limiting sleeve (22) is sleeved on the central tube; The piston (28) is connected to the central tube via a piston shear pin (29) and is positioned close to the reverse claw spring limiting sleeve (22); The reverse claw spring (19) is sleeved on the reverse claw spring limiting sleeve (22) and connected to the reverse claw spring limiting sleeve (22) through the limiting sleeve scissor pin (21); The retrieval claw spring (25) is sleeved on the reverse claw spring (19) and the base tube (27), and is threadedly connected to the reverse claw spring (19) and the base tube (27) respectively; The tilting assembly also includes a limiting sleeve lock ring (20); The limiting sleeve locking ring (20) is embedded between the reverse claw spring limiting sleeve (22) and the central tube, and a toothed buckle structure is provided between it and the central tube; The tilting assembly also includes an upper connector (1), a feeding rod (2), a connecting short section (7), a straightening ring (4), a force transmission key (5), a straightening plate (3), a window-opening guide slope (6), a chip-collecting cup (8), a torque transmission short section (10), and a torque transmission key (14). The salvage assembly also includes a directional sealing return cylinder (13) sleeved on the torque transmission short section (10). The upper connector (1) is connected to one end of the feeding rod (2), and the other end of the feeding rod (2) is threadedly connected to the connecting short section (7); From the upper connector (1) to the direction away from the upper connector (1), the straightening ring (4) and the force transmission key (5) are sequentially arranged on the feeding rod (2), wherein the straightening ring (4) is sleeved on the feeding rod (2), and the force transmission key (5) is fixedly connected to the feeding rod (2). The straightening plate (3) is sleeved on the feeding rod (2) and connected to the straightening ring (4) by a pin; The window opening guide ramp (6) is connected between the straightening plate (3) and the feeding rod (2), and is also connected to the connecting short section (7); The chip-collecting cup (8) is fixedly sleeved on the connecting short section (7). The end of the connecting section (7) away from the window opening guide slope (6) is connected to the torsion transmission section (10), and a filter (11) is provided between the connecting section (7) and the torsion transmission section (10). The directional sealing return sleeve (13) is sleeved on the torsion transmission short section (10). The torsion key (14) is fixed to the torsion short section (10) and is located in the keyway of the directional sealing return cylinder (13); The locking pin (12) is fixed to the torsion transmission short section (10) and engages with the directional sealing return cylinder (13).

2. The multifunctional slant device according to claim 1, characterized in that, The dual-cylinder assembly includes a locking block sleeve (44), an upper cylinder (45), a lower cylinder (49), and a cylinder locking ring (55). The locking block sleeve (44) is connected to the sealing and anchoring assembly and also to the upper liquid cylinder (45); The lower liquid cylinder (49) is connected to the upper liquid cylinder (45) at the end away from the locking block sleeve (44); The cylinder locking ring (55) is embedded between the lower cylinder (49) and the base tube (27), and a toothed buckle structure is provided between it and the base tube (27); The flow passage is provided in multiple sets, and the base tube (27) is connected to the upper liquid cylinder (45) and the lower liquid cylinder (49) through the multiple sets of flow passages respectively.

3. The multifunctional slant device according to claim 2, characterized in that, The dual hydraulic cylinder assembly also includes a locking block (46) and a locking block limiting sleeve (48). The locking block (46) is located at the flow hole communicating with the upper liquid cylinder (45) and is inserted from the locking block sleeve (44) into the base tube (27). The locking block limiting sleeve (48) is fitted onto the locking block (46) and connected to the locking block (46) by a shear pin (47).

4. The multifunctional slant device according to claim 1, characterized in that, The slip assembly includes an upper cone (33), a slip cover (35), a lower cone (37), a slip (36), and a cone locking ring (38); The upper cone (33) is connected to the variable snap joint (31); The lower cone (37) is spaced apart from the upper cone (33) and is located at the end of the upper cone (33) away from the variable snap joint (31); The clasp (35) is connected between the upper cone (33) and the lower cone (37), and together with the upper cone (33) and the lower cone (37) form an accommodating space; The clasp (36) is disposed within the accommodating space; The cone locking ring (38) is embedded between the lower cone (37) and the base tube (27), and a toothed buckle structure is provided between the cone locking ring (38) and the base tube (27).

5. The multifunctional slant device according to claim 1, characterized in that, The sealing and anchoring assembly also includes a rubber sleeve shaft (43), an end rubber sleeve (40), a middle rubber sleeve (41), and a spacer ring (42). The rubber sleeve shaft (43) is connected between the slip assembly and the dual hydraulic cylinder assembly; Both the end rubber sleeve (40) and the middle rubber sleeve (41) are sleeved on the rubber sleeve shaft (43). The spacer ring (42) is sleeved on the rubber tube shaft (43) and is located between the adjacent end rubber tube (40) and the middle rubber tube (41).

6. The multifunctional slant device according to claim 5, characterized in that, The directional sealing return tube (13) is provided with a long sealing smooth surface and a locking ring step.

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