MWD safety seat key anti-drop device

Abstract

The present invention relates to the technical field of MWD instruments in oil drilling systems, and is an MWD safety key anti-slip device, comprising a circulation sleeve, a docking guide shoe, a guide shoe barrel, a retaining spring, an anti-puncture ring and a directional key. The present invention has a reasonable and compact structure, and the guide surface increases the inner diameter of the upper end of the circulation sleeve. When deployed, various steps and slight tilts and misalignments at the lower end of the guide shoe barrel of the MWD instrument will be guided into the circulation sleeve under the action of the docking guide shoe guide surface. By setting the retaining spring, when the guide shoe barrel is installed in the circulation sleeve, the upper end of the retaining spring and the directional groove can constrain the directional key, so that the directional key cannot fall out of the directional groove, thereby achieving the effect of preventing the key from falling out. The setting of the positioning card table can avoid the misalignment of the opening of the retaining spring and the directional groove after the retaining spring rotates in the card slot, so that the directional key cannot enter the directional groove, thereby meeting the safety requirements of the MWD instrument in high-angle directional wells, especially horizontal wells, expanding the scope of use of the instrument, and ensuring the increase in drilling speed and efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of MWD instruments for oil drilling systems, and is an MWD safety seat key anti-dropping device. Background Art

[0002] Measurement-While-Drilling (MWD) instruments are primarily used in oil drilling systems and are crucial for reducing drilling costs, ensuring safe drilling, and accelerating the process of scientific and automated drilling. With the rapid advancement of drilling technology, the desire for more comprehensive downhole information is increasing, placing higher demands on the measurement capabilities of MWD instruments. MWD instruments not only measure engineering parameters such as wellbore inclination, azimuth, and toolface to guide the drill bit, but also mechanical parameters such as weight on bit and bit torque. They can also measure geological parameters such as formation gamma ray, resistivity, and porosity to interpret and evaluate formation characteristics, effectively control the wellbore trajectory through the reservoir, and achieve geosteering. Representing the pinnacle of oil drilling technology, they are currently the most advanced instruments in the domestic drilling industry and a powerful tool for wellbore trajectory control, increasing drilling speed, and improving efficiency. However, their inherent limitations have brought significant inconvenience to drilling operations, including low deployment success rates and frequent key-outs, particularly in horizontal wells. Key-outs can necessitate tripping the wellbore, impacting both safety and efficiency. In addition, the instrument's structural design is not ideal, making initial installation and deployment difficult. It's often difficult to successfully deploy the key on the first try before drilling, requiring repeated attempts. These issues severely restrict and impact drilling speed and efficiency. Ensuring successful deployment of the MWD instrument and preventing key release during drilling are major challenges facing the drilling industry and require urgent solutions. Summary of the Invention

[0003] The present invention provides an MWD safety key-off prevention device, which overcomes the shortcomings of the above-mentioned prior art. It can effectively solve the problems of low deployment success rate and frequent key-off in existing MWD instruments, especially in horizontal wells, where key-off is more likely to occur. Once the key is off, the drill has to be pulled out, which affects the safety and speed of drilling.

[0004] The technical solution of the present invention is achieved through the following measures: an MWD safety seat key anti-detachment device, including a circulation sleeve, a docking guide shoe, a guide shoe barrel, a retaining spring, an anti-puncture ring and a directional key, the inner side of the upper end of the circulation sleeve is sealed and fixed to the outer side of the lower end of the docking guide shoe, the inner side of the upper end of the docking guide shoe is provided with a conical guide surface with a larger upper portion and a smaller lower portion, a plurality of drainage holes are evenly distributed along the circumference of the guide surface and extend from the lower end to the outer wall of the docking guide shoe, an upper sealing sleeve is installed in the circulation sleeve, a guide shoe barrel mounted in the docking guide shoe, an anti-puncture ring is fixed on the outer side of the guide shoe barrel corresponding to the position above the docking guide shoe, a directional ring platform is fixed on the outer side of the middle of the guide shoe barrel, and an opening is provided on the outer side of the front of the directional ring platform, and the lower end extends to the lower end of the directional ring platform. The directional groove of the surface, a guide block is fixed at the lower end of the directional ring platform, and the transition part between the lower end of the guide block and the lower part of the left wall of the directional groove is formed with a left spiral surface, and the transition part between the lower end of the left spiral surface and the lower part of the right wall of the directional groove is formed with a right spiral surface that is symmetrical with the left spiral surface. The lower part of the directional ring platform is provided with an annular clamping groove connected with the directional groove at the front, and a retaining spring is provided in the clamping groove with an opening corresponding to the directional groove. The rear part of the directional ring platform corresponding to the position of the directional groove is provided with a fixing groove with an outward opening and the lower end connected with the rear part of the clamping groove, and a positioning clamping platform is provided in the fixing groove, the lower end of which is fixed with the upper end of the retaining spring, and the outer side of the upper part of the circulating sleeve corresponding to the position of the directional groove is provided with a radially through directional hole, and a directional key installed inside the directional hole is fixedly installed on the upper part of the directional groove.

[0005] The following are further optimizations and / or improvements to the above technical solutions:

[0006] The above-mentioned clamping spring can be a C-shaped clamping spring, and the transition parts between the lower parts of the inner walls on both sides of the opening of the clamping spring and the lower end surface of the clamping spring are formed with inclined lower transition surfaces.

[0007] The transition areas between the upper inner walls on both sides of the opening of the above-mentioned retaining spring and the upper end surface of the retaining spring can be formed with upper transition surfaces, and the upper transition surfaces include vertical transition surfaces and inclined transition surfaces connected in sequence from bottom to top.

[0008] The outer side of the above-mentioned circulation sleeve may have several ribs arranged along the axis. The directional hole is an oblong stepped hole radially arranged on the upper part of one of the ribs. The directional key matches the directional hole, and the upper side wall of the directional groove is an arc surface matching the outer side of the upper part of the directional key.

[0009] The above-mentioned ribs may include wide ribs and narrow ribs. Two narrow ribs are distributed along the circumference on the outside of the circulation sleeve. A wide rib corresponding to the directional groove is fixed on the outside of the circulation sleeve between the two narrow ribs. The directional hole is set on the upper part of the wide rib. Two threaded through holes are provided on the inner wall of the narrow diameter section of the directional hole at intervals above and below. Each threaded through hole is provided with a bolt fixed to the directional key.

[0010] The valve cylinder can be sealed and fixedly installed on the outer side of the upper end of the guide shoe tube corresponding to the upper side of the anti-puncture ring. The inner side of the guide shoe tube is provided with a signal valve stem with upper and lower ends located above and below the guide shoe tube respectively. The valve core is fixedly installed on the lower end of the signal valve stem corresponding to the position below the guide shoe tube. The piston cap sealed and sleeved in the valve cylinder is fixedly installed on the upper end of the signal valve stem corresponding to the position above the guide shoe tube. A compression spring is installed between the upper end of the piston cap and the inner side of the upper part of the valve cylinder.

[0011] The present invention has a reasonable and compact structure, and the guide surface increases the inner diameter of the upper end of the circulation sleeve. When the MWD instrument is put into operation, various steps and slight tilt and non-centering at the lower end of the guide shoe barrel of the MWD instrument will be guided into the circulation sleeve under the action of the docking guide shoe guide surface. By arranging the retaining spring, when the guide shoe barrel is installed in the circulation sleeve, the upper end of the retaining spring and the directional groove can constrain the directional key, so that the directional key cannot fall out of the directional groove, thereby achieving the effect of preventing the key from falling out. The setting of the positioning card table can prevent the opening of the retaining spring from being misaligned with the directional groove after the retaining spring rotates in the card groove, so that the directional key cannot enter the directional groove, thereby meeting the safe use of the MWD instrument in high-angle directional wells, especially horizontal wells, expanding the scope of use of the instrument, and ensuring the increase in speed and efficiency of drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attachment Figure 1 It is a schematic diagram of the main cross-sectional structure of the present invention.

[0013] Attachment Figure 2 This is a schematic diagram of the main structure of the circulation sleeve and directional key after installation in the present invention.

[0014] Attachment Figure 3 It is a schematic diagram of the rotating cross-sectional structure of the circulation sleeve in the present invention.

[0015] Attachment Figure 4 It is a schematic diagram of the three-dimensional structure of the docking shoe in the present invention.

[0016] Attachment Figure 5 It is a schematic diagram of the three-dimensional structure of the anti-puncture ring in the present invention.

[0017] Attachment Figure 6 The three-dimensional structure diagram of the assembly of the shoe guide and the retaining spring in the present invention is shown as follows: Figure 1 .

[0018] Attachment Figure 7 The three-dimensional structure diagram of the assembly of the shoe guide and the retaining spring in the present invention is shown as follows: Figure 2 .

[0019] Attachment Figure 8 It is a schematic diagram of the three-dimensional structure of the retaining spring in the present invention.

[0020] The codes in the accompanying drawings are: 1 for the circulation sleeve, 2 for the docking guide shoe, 3 for the guide shoe barrel, 4 for the retaining spring, 5 for the anti-puncture ring, 6 for the directional key, 7 for the guide surface, 8 for the drainage hole, 9 for the directional ring platform, 10 for the directional groove, 11 for the guide block, 12 for the left helical surface, 13 for the right helical surface, 14 for the card slot, 15 for the fixed groove, 16 for the positioning card platform, 17 for the directional hole, 18 for the lower transition surface, 19 for the vertical transition surface, 20 for the inclined transition surface, 21 for the wide rib plate, 22 for the narrow rib plate, 23 for the threaded through hole, 24 for the valve cylinder, 25 for the signal valve stem, 26 for the valve core, 27 for the piston cap, and 28 for the compression spring. DETAILED DESCRIPTION

[0021] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0022] In the present invention, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 For example, the positional relationships of front, back, up, down, left, and right are determined according to the layout directions of the drawings in the specification.

[0023] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0024] As attached Figure 1 、 2As shown in , 3, 4, 5, 6, 7, and 8, the MWD safety seat key anti-detachment device includes a circulation sleeve 1, a docking guide shoe 2, a guide shoe barrel 3, a retaining spring 4, an anti-puncture ring 5 and a directional key 6. The inner side of the upper end of the circulation sleeve 1 is sealed and fixed to the outer side of the lower end of the docking guide shoe. The inner side of the upper end of the docking guide shoe 2 is provided with a conical guide surface 7 which is larger at the top and smaller at the bottom. A number of drainage holes 8 with the lower ends extending to the outer wall of the docking guide shoe 2 are evenly distributed along the circumference on the guide surface 7. An upper sealing sleeve is installed in the circulation sleeve 1 to fit within the docking guide shoe 2. An anti-puncture ring 5 with a lower end face matching the guide surface 7 is fixed to the outer side of the guide shoe barrel 3 at the upper side of the docking guide shoe 2. A directional ring platform 9 is fixed to the outer side of the middle of the guide shoe barrel 3. The outer side of the front of the directional ring platform 9 is provided with a directional groove 10 which opens forward and extends to the lower end face of the directional ring platform 9. The lower end of the directional ring platform 9 is fixed with The guide block 11 and the transition portion between the lower end of the guide block 11 and the lower portion of the left side wall of the directional groove 10 are formed with a left helical surface 12, and the transition portion between the lower end of the left helical surface 12 and the lower portion of the right side wall of the directional groove 10 is formed with a right helical surface 13 which is symmetrical with the left helical surface 12. The lower portion of the directional ring platform 9 is provided with an annular clamping groove 14 whose front is connected to the directional groove 10, and a retaining spring 4 with an opening corresponding to the directional groove 10 is provided in the clamping groove 14. The rear portion of the directional ring platform 9 corresponding to the position of the directional groove 10 is provided with a fixing groove 15 whose opening is outward and the lower end is connected to the rear of the clamping groove 14, and a positioning clamping platform 16 is provided in the fixing groove 15, the lower end of which is fixed to the upper end of the retaining spring 4, and the outer side of the upper portion of the circulation sleeve 1 corresponding to the position of the directional groove 10 is provided with a radially through directional hole 17, and a directional key 6 whose inner side is mounted on the upper portion of the directional groove 10 is fixedly installed in the directional hole 17.

[0025] According to the requirements, the locking force of the retaining spring 4 is 60kg, the upper end face of the anti-stab ring 5 has an inclined surface symmetrically arranged with the lower end face, the directional ring platform 9, the guide block 11 and the shoe guide tube 3 are integrated, and the retaining spring 4 and the positioning retaining platform 16 are integrated. During use, there is a tapered guide surface 7 on the inner side of the upper end of the butt guide shoe 2, which is larger at the top and smaller at the bottom. The guide surface 7 increases the inner diameter of the upper end of the circulation sleeve 1 and has a guiding function. When the MWD instrument is put in, the various steps and slight tilt and non-centering at the lower end of the guide shoe barrel 3 will be guided into the circulation sleeve 1 under the action of the guide surface 7 of the butt guide shoe 2. In a specific embodiment, the butt guide shoe 2 can be made of high-quality steel that is resistant to erosion. The outer diameter of the butt guide shoe 2 is Ø58mm, the height is 80mm, and the inner diameter is Ø44.7mm. In order to facilitate maintenance and replacement, the butt guide shoe 2 is screwed to the upper end of the circulation sleeve 1, and 12 drainage holes 8 with an inner diameter of Ø8mm are evenly distributed along the circumference on the guide surface 7 of the butt guide shoe 2 to facilitate the passage of mud and avoid erosion and damage caused by the vortex formed by the high-pressure mud flowing through the guide surface 7; a puncture-proof ring 5 with a lower end face matching the guide surface 7 is fixedly installed on the outer side of the guide shoe barrel 3, and the MWD instrument is successfully The directional key 6 can not be dislodged from the directional slot 10 by arranging the retaining spring 4 when the guide shoe 3 is installed in the circulation sleeve 1, thereby achieving the effect of preventing the directional key 6 from being dislodged. It is also convenient for the salvage and deployment of the MWD instrument after the drill is stuck. The arrangement of the positioning card platform 16 can prevent the opening of the retaining spring 4 from being misaligned with the directional slot 10 after the retaining spring 4 rotates in the card slot 14, so that the directional key 6 cannot enter the directional slot 10. The present invention has a reasonable and compact structure and is easy to use. It can be successfully deployed once during the initial installation before drilling, and effectively avoids the occurrence of MWD instrument dislodging during drilling, drilling and horizontal well sections. It meets the safe use of MWD instruments in highly deviated directional wells, especially horizontal wells, expands the scope of use of the instrument, and ensures the speed and efficiency of drilling.

[0026] The above-mentioned MWD safety seat key anti-drop device can be further optimized and / or improved according to actual needs:

[0027] As attached Figure 1 、 6As shown in Figures 7 and 8, the retaining spring 4 is a C-shaped retaining spring. The transition areas between the lower inner walls on both sides of the opening of the retaining spring 4 and the lower end surface of the retaining spring 4 are formed with inclined lower transition surfaces 18. As required, the two lower transition surfaces 18 form a V-shape with the opening facing upward. During use, by providing the lower transition surfaces 18, the retaining spring 4 is inserted into the slot 14, and the shoe guide 3 is inserted into the circulation sleeve 1 from top to bottom. When the directional key 6 on the circulation sleeve 1 contacts the left helical surface 12 or the right helical surface 13, the shoe guide 3 is driven to rotate until the upper end of the directional key 6 enters the directional slot 10. Then, the upper end of the directional key 6 enters the opening of the retaining spring 4 under the guidance of the lower transition surfaces 18. Under the action of the deadweight of the shoe guide 3, the upper end of the directional key 6 opens the opening of the retaining spring 4 and moves upward into the directional slot 10 on the upper side of the retaining spring 4. Then, the retaining spring 4 and the directional slot 10 constrain the directional key 6, preventing it from falling out of the key slot, thereby achieving the effect of preventing the key from falling out.

[0028] As attached Figure 1 、 6 As shown in Figures 7 and 8, the transition areas between the upper inner walls on both sides of the opening of the retaining spring 4 and the upper end surface of the retaining spring 4 are formed with upper transition surfaces, and the upper transition surfaces include a vertical transition surface 19 and an inclined transition surface 20 sequentially connected from bottom to top. During use, the length of the directional groove 10 can be extended by the vertical transition surface 19 and the inclined transition surface 20, so that the directional key 6 is tightly stuck in the groove formed by the inner wall of the directional groove 10 and the retaining spring 4, locking the shoe guide 3 to prevent it from exiting and avoiding the occurrence of the key-off phenomenon. It can achieve a successful one-time placement of the key during the initial installation, and at the same time make the structure of the present invention more compact. If the drill is stuck, the C-shaped retaining spring 4 will be opened again after the upward pulling force exceeds 60kg, and the MWD instrument can continue to be salvaged or placed after a failure, and can be reused.

[0029] As attached Figure 1 、 2 As shown in Figures 3 and 4, the outer side of the circulation sleeve 1 has several ribs arranged along the axis. The directional hole 17 is an oblong stepped hole radially arranged on the upper part of one of the ribs. The directional key 6 matches the directional hole 17, and the upper sidewall of the directional groove 10 is an arc surface that matches the upper outer side of the directional key 6. During use, the directional key 6 matches the directional hole 17, and the outer side of the directional key 6 is set as an arc surface, which effectively prevents the directional key 6 from damaging the swirl guide shoe, resulting in the failure of the MWD instrument to successfully key. This improves the success rate of the MWD instrument keying.

[0030] As attached Figure 1 、 2As shown in Figures 3 and 4, the ribs include wide ribs 21 and narrow ribs 22. Two narrow ribs 22 are spaced apart along the circumference of the outer side of the circulation sleeve 1. A wide rib 21 corresponding to the directional groove 10 is fixed to the outer side of the circulation sleeve 1 between the two narrow ribs 22. The directional hole 17 is provided on the upper portion of the wide rib 21. Two threaded through holes 23 are spaced apart above and below the inner wall of the narrow diameter section of the directional hole 17. Each threaded through hole 23 is provided with a bolt fixed to the directional key 10. During use, this arrangement facilitates the disassembly and assembly of the directional key 6, facilitating subsequent maintenance.

[0031] As attached Figure 1 As shown, a valve cylinder 24 is fixedly and sealedly mounted on the outer side of the upper end of the shoe guide tube 3 corresponding to the upper side of the anti-stab ring 5. A signal valve stem 25 is sleeved on the inner side of the shoe guide tube 3 with its upper and lower ends respectively located above and below the shoe guide tube 3. A valve core 26 is fixedly mounted on the lower end of the signal valve stem 25 corresponding to the lower position of the shoe guide tube 3. A piston cap 27, which is sealed and sleeved in the valve cylinder 24, is fixedly mounted on the upper end of the signal valve stem 25 corresponding to the upper position of the shoe guide tube 3. A compression spring 28 is installed between the upper end of the piston cap 27 and the inner side of the upper part of the valve cylinder 24. During use, this arrangement facilitates the disassembly, assembly, and maintenance of the shoe guide tube 3 and the MWD instrument.

[0032] The present invention has been applied in the Tuha area and achieved good anti-debonding effect, avoiding the number of tripping and drilling due to debonding, and winning valuable time for the well crew. The anti-debonding device has been applied in Dongchu, Wenchu ​​and other wells, and no debonding phenomenon has occurred. It is currently planned to be promoted and applied in the southwest and Jimsar areas, and its application prospects are broad.

[0033] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A MWD safety key anti-drop device, characterized in that It includes a circulation sleeve, a docking guide shoe, a guide shoe barrel, a retaining spring, an anti-stab ring and a directional key. The inner side of the upper end of the circulation sleeve is sealed and fixed to the outer side of the lower end of the docking guide shoe. The inner side of the upper end of the docking guide shoe is provided with a conical guide surface which is larger at the top and smaller at the bottom. A number of drainage holes are evenly distributed along the circumference of the guide surface and extend from the lower end to the outer wall of the docking guide shoe. An upper sealing sleeve is installed in the circulation sleeve, which is fitted on the guide shoe barrel in the docking guide shoe. An anti-stab ring is fixed on the outer side of the guide shoe barrel at the position above the docking guide shoe, and a directional ring platform is fixed on the outer side of the middle of the guide shoe barrel. A directional groove is provided on the outer side of the front of the directional ring platform, which opens forward and extends to the lower end of the directional ring platform. A guide groove is fixed on the lower end of the directional ring platform. The block, the transition part between the lower end of the guide block and the lower part of the left side wall of the directional groove is formed with a left spiral surface, and the transition part between the lower end of the left spiral surface and the lower part of the right side wall of the directional groove is formed with a right spiral surface that is symmetrical with the left spiral surface. The lower part of the directional ring table is provided with an annular clamping groove connected with the directional groove at the front, and a retaining spring with an opening corresponding to the directional groove is provided in the clamping groove. The rear part of the directional ring table corresponding to the position of the directional groove is provided with a fixing groove with an outward opening and the lower end connected with the rear part of the clamping groove. A positioning clamping table with a lower end fixed to the upper end of the retaining spring is provided in the fixing groove. A radially penetrating directional hole is provided on the outer side of the upper part of the circulation sleeve corresponding to the position of the directional groove, and a directional key installed on the inner side of the upper part of the directional groove is fixedly installed in the directional hole. The circlip is a C-shaped circlip, and the transition portion between the lower portion of the inner wall on both sides of the opening of the circlip and the lower end surface of the circlip is formed with an inclined lower transition surface; Upper transition surfaces are formed at transition locations between the upper inner walls on both sides of the opening of the clamping spring and the upper end surface of the clamping spring. The upper transition surfaces include vertical transition surfaces and inclined transition surfaces that are sequentially connected from bottom to top.

2. The MWD safety key anti-drop device according to claim 1 is characterized in that The outer side of the circulation sleeve has several ribs arranged along the axis. The directional hole is an oblong step hole radially arranged on the upper part of one of the ribs. The directional key matches the directional hole, and the upper side wall of the directional groove is an arc surface matching the outer side of the upper part of the directional key.

3. The MWD safety key anti-drop device according to claim 2 is characterized in that The ribs include wide ribs and narrow ribs. Two narrow ribs are distributed along the circumference on the outside of the circulation sleeve. A wide rib corresponding to the directional groove is fixed on the outside of the circulation sleeve between the two narrow ribs. The directional hole is set on the upper part of the wide rib. Two threaded through holes are set at intervals on the upper and lower inner walls of the narrow diameter section of the directional hole. Each threaded through hole is provided with a bolt fixed to the directional key.

4. The MWD safety key anti-drop device according to claim 1, 2 or 3, characterized in that A valve cylinder is sealed and fixedly installed on the outer side of the upper end of the guide shoe tube corresponding to the upper side of the anti-puncture ring, and a signal valve stem is sleeved on the inner side of the guide shoe tube with the upper and lower ends located above and below the guide shoe tube respectively. A valve core is fixedly installed on the lower end of the signal valve stem corresponding to the position below the guide shoe tube, and a piston cap sealed and sleeved in the valve cylinder is fixedly installed on the upper end of the signal valve stem corresponding to the position above the guide shoe tube, and a compression spring is installed between the upper end of the piston cap and the inner side of the upper part of the valve cylinder.

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