Deep sea while-drilling casing running equipment system and its operation method

Abstract

The application discloses a deep-sea while-drilling casing well completion equipment system and a working method thereof, and relates to the technical field of drilling equipment. The system comprises a casing connecting nipple, a feeding tool, a steel cable fisher, a heavy hammer, a sitting nipple, a winged drill bit and a guide drill bit. The casing feeding tool is simple in structure, and only needs to be rotated, without the need of complex actions such as mechanical ball throwing, pressure holding, downward pressure shearing and the like. The winged drill bit assembly is used to complete the rotary drilling construction of the casing well section, and can guarantee that the well hole meets the design depth and the well hole shape is more regular than the jet hole forming rule. After the casing is placed, the next well hole drilling work can be directly performed without the need of tripping out. The technology is controllable, and the cost is lower. The heavy hammer is thrown, the blades of the winged drill bit are opened, the heavy hammer is fished and recovered after the winged drill bit completes the predetermined work, the blades are retracted, the expansion and recovery of the blades are circular, the drilling work of more than two well holes can be completed without tripping out and replacing the drill bit, and the production efficiency can be greatly improved.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and in particular to a deep-sea drilling equipment system with casing running in and out of the well, and its operation method. Background Technology

[0002] Running-in-the-hole (Run-in-the-hole) is a drilling technique that involves gradually lowering casing into the wellbore during drilling to connect it to the drilling pipeline. This protects the wellbore and formation, and ensures wellhead safety. Run-in-the-hole technology can promptly improve wellhead safety, reduce the risk of formation fluid leakage, and protect the wellbore from erosion and collapse.

[0003] Currently, the main casing-running technology used in deep-sea drilling is the "jet casing insertion" method.

[0004] The technical characteristics of jetting guide insertion are: the surface casing and drill string are combined as a whole. The drill string forms the wellbore by impacting the formation with high-pressure, high-volume mud rather than by rotating the drill bit to cut the formation. The casing is lowered into the wellbore along with the drill string while being impacted. When the casing is lowered to the planned position, the impact of the mud is stopped, and the insertion of the casing is completed.

[0005] After the casing is installed, this drill string assembly also supports drilling the next well opening without lifting the drill string to change the drill string. This is mainly achieved by unlocking a special locking mechanism on the casing and drill string, allowing the drill string to detach from the casing and use rotary drilling technology to carry out the next well opening.

[0006] The disadvantages of inserting the jetting conduit are: 1. It is extremely dependent on the parameters of the previous formation exploration. If the parameters are wrong, the actual jetting depth will be much smaller than the calculated depth; 2. The maximum jetting depth is limited. The current limit is <90 meters. Summary of the Invention

[0007] To address the above technical problems, this invention provides a deep-sea casing running equipment system for drilling operations, enabling the running of casing during drilling and completing drilling work in two or more wellbore openings. The workload and working time can be reduced by 50% compared to conventional reaming drill bits, which can greatly improve production efficiency.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] This invention provides a deep-sea drilling equipment system for running casing, including a casing connection sub, a drive tool, a cable retriever, a counterweight, a landing sub, a winged drill bit, and a guide drill bit. The drive tool is installed inside the casing connection sub; the top of the drive tool is connected to the upper drill pipe; the bottom of the casing connection sub is connected to the casing; the lower end of the winged drill bit is connected to the upper end of the guide drill bit; the upper end of the winged drill bit is connected to the lower end of the landing sub; the upper end of the landing sub is connected to the inner horizontal drill pipe; the counterweight is installed inside the landing sub and the inner horizontal drill pipe, and the counterweight is used to open the winged drill bit; the upper end of the cable retriever is connected to one end of a steel cable, and the bottom of the cable retriever is used to connect to the top of the counterweight.

[0010] Optionally, the feeding tool includes a feeding tool section, a feeding tool body, a spring, a sliding block, a sleeve, a drive ring, and a sleeve weight pin. The upper and lower outer walls of the feeding tool section are threaded. The upper part of the feeding tool section is used to connect to an upper drill pipe; the lower part of the feeding tool section is used to connect to an inner flat drill pipe. The feeding tool body is fitted into the middle of the feeding tool section. A drive ring is located inside the feeding tool body on the outer wall of the middle portion of the feeding tool section. A sliding block is located inside the feeding tool body. The upper surface of the sliding block and the lower surface of the drive ring are mutually mating inclined surfaces. The sleeve weight pin is located on the side of the sliding block away from the drive ring, and the end of the sleeve weight pin away from the sliding block passes through the feeding tool body. The spring is located between the sleeve weight pin and the inner wall of the feeding tool body. A limiting groove is provided on the inner wall of the sleeve connecting section, and the end of the sleeve weight-bearing pin away from the sliding block matches the limiting groove.

[0011] The bottom of the sleeve connecting section is connected to the top of the sleeve via a reducing pipe.

[0012] Optionally, the wing drill bit includes a housing, a blade, a blade drive push rod, and an elastic element; the housing is a hollow rod; the lower middle part of the housing has multiple through holes along the circumference, and the upper middle part of the housing has a stepped hole above the through holes; the top of the through holes is rotatably connected to the top of the blade; the side of the blade facing the inside of the housing has a guide groove in the upper middle part of the blade, and the lower part of the guide groove is an inclined surface that gradually extends towards the center of the housing; the bottom of the blade drive push rod has a laterally extending push plate; the push plate matches the guide groove; the upper middle part of the blade drive push rod has a limit ring, and the elastic element is arranged on the blade drive push rod between the limit ring and the bottom surface of the stepped hole; the top of the housing has a first internal thread for connecting with the landing section, and the bottom of the housing has a second internal thread for connecting with the guide drill bit.

[0013] Optionally, a blade limiting mechanism is provided on the outer wall of the housing at the top of the through hole; the blade limiting mechanism includes a limiting plate, the top of the limiting plate is detachably connected to the housing, and the bottom of the limiting plate is provided with a limiting inclined surface on one side facing the housing. After the blade is opened, it is pressed against the limiting inclined surface to limit the maximum opening angle of the blade.

[0014] Optionally, the elastic element is a helical spring.

[0015] Optionally, the placement section includes a tube body; the top of the tube body is provided with a third internal thread for connecting with the inner flat drill rod; the bottom of the tube body is provided with a first external thread for connecting with the wing drill bit; a placement shoulder is provided in the middle of the tube body; and a spring-loaded shoulder is provided in the upper part of the tube body.

[0016] Optionally, the counterweight includes a retrieval spearhead, a spring clip recovery tube, spring clips, a landing ring, and a counterweight section; the landing ring is located at the top of the counterweight section; the spring clip recovery tube is located above the landing ring; the retrieval spearhead is located above the spring clip recovery tube; the lower middle part of the spring clip recovery tube has multiple through spring clip holes circumferentially arranged, and the bottom of the spring clip holes inside the spring clip recovery tube is rotatably connected to one end of multiple spring clips, with each spring clip corresponding to one spring clip hole; the top of the spring clip holes inside the spring clip recovery tube is connected to the middle part of an elastic body; the end of the elastic body contacts the other end of the spring clip, and the elastic body is used to allow the other end of the spring clip to extend outside the spring clip hole.

[0017] Optionally, the elastomer is a torsion spring.

[0018] Optionally, the steel cable retrieval device includes a retrieval device body, a rotary single-action mechanism, and a retrieval hook; the rotary single-action mechanism is provided at the top of the retrieval device body; the retrieval hook is provided at the lower part of the retrieval device body; a connecting part is provided at the top of the rotary single-action body for connecting with the steel cable; the retrieval hook includes at least two hook bodies, the middle part of which is rotatably connected to the retrieval device body; and an elastic reset member is provided between the tops of the hook bodies.

[0019] Optionally, the elastic reset element is a helical spring.

[0020] This invention also discloses an operational method based on the above-mentioned deep-sea drilling casing installation equipment system, comprising the following steps:

[0021] In the first step, under normal conditions, the wing drill bit is not working; due to the action of the push rod spring, the cutter blade drives the push rod to be subjected to an upward force, at which time the cutter blade is in the closed state; when the casing and drill string are lowered, the wing drill bit is in the closed state.

[0022] The second step involves lowering the drill string to the seabed mud surface and deploying a counterweight to open the winged drill bit's cutting edges. Because the weight of the counterweight exceeds the force of the push rod spring inside the winged drill bit, the cutting edges drive the push rod downwards. The cutting edges are then pushed into the open state by the protruding push plate on the push rod. The counterweight is located within the landing section, with the landing ring in contact with the landing shoulder. The landing shoulder supports the landing ring, and the spring clip is ejected outwards under the force of the torsion spring, engaging with the spring clip shoulder and locking the counterweight within the landing section. This keeps the cutting edges of the winged drill bit in the open state. This state is the working state of the winged drill bit when the surface casing is being run in. Because the maximum outer diameter of the winged drill bit's cutting edges is larger than the outer diameter of the casing after opening, wellbore drilling of the casing section can be completed. During this drilling operation, the casing delivery tool remains locked to the casing due to its structural characteristics, causing the casing to move with the drill string.

[0023] The third step is to retrieve the hammer after the casing is installed in the well section and prepare to recover the cutter wings. After the winged drill bit has completed the predetermined amount of work, a steel cable retriever is inserted from the upper inner horizontal drill pipe. The retriever hook at the bottom of the steel cable retriever is connected to the retriever spearhead of the hammer. The hammer spearhead has differential characteristics. When the retriever pulls the spearhead, the pipe connected to the spearhead will compress the spring clip to retrieve it. After the spring clip is retrieved, the hammer can be quickly retrieved using the steel cable to recover the cutter wings of the winged drill bit.

[0024] In the fourth step, after the hammer is lifted by the steel cable retrieval device, the push rod spring inside the wing drill bit is compressed and stored, which drives the cutter blade to drive the push rod upward, retracts the cutter blade, and returns it to its original state; the drill string is pressed down and rotated forward to unlock the casing insertion tool, so that the insertion tool sub and the insertion tool body are separated; after separation, the drill string assembly can continue to drill downward to form a second wellbore;

[0025] Fifth, through the above steps, the expansion and retrieval cycle of the wing of the drill bit is completed, and the locking and unlocking cycle of the feed tool is also completed. At this time, the drill string can be lifted to retrieve the entire set of running casing drilling equipment and complete the well drilling operation.

[0026] The present invention achieves the following technical effects compared to the prior art:

[0027] The deep-sea casing installation equipment system of this invention simplifies the casing insertion tool structure. Its unlocking and locking process only requires rotating the drill string, eliminating the need for complex actions such as mechanical ball dropping, pressure build-up, and downward shearing. The use of the wing drill bit assembly to complete the rotary drilling construction of the casing section can ensure that the wellbore meets the design depth and has a relatively regular wellbore shape. Using this equipment system, the next wellbore drilling work can be carried out directly without lifting the drill after the casing is inserted. The technology is controllable and the cost is lower. The deep-sea drilling and casing installation system of this invention uses a hammer to deploy a weight that acts on the winged drill bit, causing the blades in the winged drill bit to open. After the winged drill bit completes its predetermined workload, the hammer is retrieved and recovered using a steel cable retrieval device, allowing the blades of the winged drill bit to retract. This enables a cycle of blade expansion and retrieval in the winged drill bit, allowing drilling operations to be completed in two or more passes without lifting the drill string and changing the drill bit. This significantly reduces the workload and working time compared to conventional reaming drill bits, greatly improving production efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the surface casing method in the deep-sea drilling and casing completion equipment system of the present invention;

[0030] Figure 2 This is a schematic diagram of the deep-sea drilling casing installation equipment system of the present invention, after it has been opened and positioned, and the drilling tools have been retrieved.

[0031] Figure 3This is a schematic diagram of the deep-sea drilling while casing completion equipment system of the present invention for second-stage drilling without lifting the drill bit;

[0032] Figure 4 This is a partially enlarged structural diagram of point A in the deep-sea drilling and casing installation equipment system of the present invention;

[0033] Figure 5 This is a schematic diagram of the inner horizontal drill pipe in the deep-sea drilling and casing completion equipment system of the present invention;

[0034] Figure 6 This is a schematic diagram of the steel cable retrieval device in the deep-sea drilling casing installation equipment system of the present invention;

[0035] Figure 7 This is a schematic diagram of the counterweight in the deep-sea drilling casing installation equipment system of the present invention;

[0036] Figure 8 This is a schematic diagram of the structure of the short section in the deep-sea drilling casing completion equipment system of the present invention;

[0037] Figure 9 This is a schematic diagram of the winged drill bit in the deep-sea drilling and casing installation equipment system of the present invention;

[0038] Figure 10 This is a schematic diagram of the guide drill bit in the deep-sea drilling and casing installation equipment system of the present invention;

[0039] Figure 11 This is a schematic diagram of the deep-sea drilling and casing installation equipment system under normal drilling conditions.

[0040] Figure 12 This is a schematic diagram of the open-blade drill bit in the deep-sea drilling and casing installation equipment system of the present invention.

[0041] Figure 13 A schematic diagram of the structure for preparing the recoverable cutter wing in the deep-sea drilling casing installation equipment system of the present invention;

[0042] Figure 14 This is a schematic diagram of the structure of the deep-sea drilling casing installation equipment system of the present invention, showing the repositioning of the cutter wings after the hammer is retrieved.

[0043] Explanation of reference numerals in the attached drawings: 1. Inner flat drill pipe; 2. Steel cable; 3. Rotary single-action mechanism; 4. Retrieval hook; 5. Retrieval spearhead; 6. Spring-loaded retrieval tube; 7. Spring-loaded retrieval tube; 8. Settling ring; 9. Counterweight section; 10. Spring-loaded retrieval shoulder; 11. Settling shoulder; 12. Blade drive push rod; 13. Drill bit housing; 14. Push rod spring; 15. Blade limiting mechanism; 16. Blade; 17. Guide drill bit; 18. Steel cable retrieval device; 19. Counterweight; 20. Settling section; 21. Opening wing drill bit; 22. Pin; 23. Upper slider; 24. First elastic cylindrical pin; 25. Second elastic cylindrical pin; 26. Third elastic cylindrical pin; 27. Lower slider; 28. Torsion spring; 29. ​​Sleeve feeding tool; 30. Screw motor; 31. Sleeve connecting section; 32. Feeding tool; 33. Feeding tool section; 34. Feeding tool body; 35. Spring; 36. Sliding block; 37. Sleeve; 38. Drive ring; 39. Sleeve weight bearing pin. Detailed Implementation

[0044] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] like Figures 1 to 14 As shown, this embodiment provides a deep-sea casing-running well completion equipment system, including a casing connection sub 31, a drive tool 32, a cable retriever 18, a counterweight 19, a placement sub 20, a winged drill bit 21, and a guide drill bit 17; the drive tool 32 is installed inside the casing connection sub 31; the top of the drive tool 32 is connected to the upper drill pipe; the bottom of the casing connection sub 31 is connected to the casing 37; the lower end of the winged drill bit 21 is connected to... The upper end of the guide drill bit 17 is connected; the upper end of the wing drill bit 21 is connected to the lower end of the landing section 20; the upper end of the landing section 20 is connected to the inner flat drill rod 1; the counterweight 19 is disposed inside the landing section 20 and the inner flat drill rod 1, and the counterweight 19 is used to open the blades on the wing drill bit 21; the upper end of the cable retrieval device 18 is connected to one end of the cable 2, and the bottom of the cable retrieval device 18 is used to connect to the top of the counterweight 19.

[0046] In this specific embodiment, the feed tool 32 includes a feed tool section 33, a feed tool body 34, a spring 35, a sliding block 36, a sleeve 37, a drive ring 38, and a sleeve weight pin 39. The upper and lower outer walls of the feed tool section 33 are threaded. The upper part of the feed tool section 33 is used to connect with the upper drill pipe; the lower part of the feed tool section 33 is used to connect with the inner flat drill pipe 1. The feed tool body 34 is fitted around the middle of the feed tool section 33. A drive ring is located inside the feed tool body 34 on the outer wall of the middle portion of the feed tool section 33. Ring 38; a sliding block 36 is provided inside the tool body 34; the upper surface of the sliding block 36 and the lower surface of the drive ring 38 are mutually cooperating inclined surfaces; a sleeve weight pin 39 is provided on the side of the sliding block 36 away from the drive ring 38, and the end of the sleeve weight pin 39 away from the sliding block 36 passes through the tool body 34; a spring 35 is provided between the sleeve weight pin 39 and the inner wall of the tool body 34; a limit groove is provided on the inner wall of the sleeve connecting short section 31, and the end of the sleeve weight pin 39 away from the sliding block 36 matches the limit groove;

[0047] The bottom of the casing connection sub 31 is connected to the top of the casing 37 via a reducing pipe, providing an anti-fall-off function for the delivery tool 32; when two drilling operations are completed, the delivery tool 32 can be pulled out of the casing 37 through the protruding part at the bottom of the sub.

[0048] More specifically, the outer wall of the feed tool sub 33 is provided with a left-hand thread. After the casing 37 is inserted into place, rotating the drill pipe in the forward direction can disengage the feed tool sub 33 from the feed tool body 34. The lower part of the feed tool sub 33 is larger than the upper part, which is used to lift the feed tool body 34 and retrieve it to the drilling vessel. The sliding block 36 and the drive ring 38 are in contact with an inclined surface. The drive block 36 is machined with a left-hand thread. The rotation of the feed tool sub 33 causes the drive block 36 to move upward or downward, thereby pushing the sliding block 36 inward or outward.

[0049] The wing drill bit 21 includes a housing, a blade 16, a blade drive push rod 12, and an elastic element. The housing is a hollow rod. The lower middle part of the housing has multiple through holes along the circumference, and the upper middle part of the housing has a stepped hole above the through holes. The top of the through holes is rotatably connected to the top of the blade 16. The side of the blade 16 facing the inside of the housing has a guide groove in the upper middle part of the blade 16, and the lower part of the guide groove is an inclined surface that gradually extends towards the center of the housing. The bottom of the blade drive push rod 12 has a horizontally extending push plate. The push plate matches the guide groove. The upper middle part of the blade drive push rod 12 has a limit ring, and the blade drive push rod 12 has an elastic element between the limit ring and the bottom surface of the stepped hole. The top of the housing has a first internal thread for connecting with the landing section 20, and the bottom of the housing has a second internal thread for connecting with the guide drill bit 17.

[0050] In this specific embodiment, the elastic element is a helical spring.

[0051] A blade limiting mechanism 15 is provided on the outer wall of the housing at the top of the through hole; the blade limiting mechanism 15 includes a limiting plate, the top of the limiting plate is detachably connected to the housing, and a limiting slope is provided on the bottom of the limiting plate facing the housing. After the blade 16 is opened, it is pressed against the limiting slope to limit the maximum opening angle of the blade 16.

[0052] The set-in section 20 includes a tube body; the top of the tube body is provided with a third internal thread for connecting with the inner flat drill rod 1; the bottom of the tube body is provided with a first external thread for connecting with the wing drill bit 21; a set-in shoulder 11 is provided in the middle of the tube body; and a spring-loaded shoulder 10 is provided in the upper part of the tube body.

[0053] The counterweight 19 includes a retrieval spearhead 5, a spring clip recovery tube 6, spring clips 7, a landing ring 8, and a counterweight short section 9. The landing ring 8 is located at the top of the counterweight short section 9. The spring clip recovery tube 6 is located above the landing ring 8. The retrieval spearhead 5 is located above the spring clip recovery tube 6. Multiple through-holes are circumferentially arranged in the lower middle part of the spring clip recovery tube 6. The bottom of each spring clip 7 is rotatably connected to one end of a plurality of spring clips 7, with each spring clip 7 corresponding to one spring clip hole. The top of each spring clip hole is connected to the middle of an elastic body. The end of the elastic body contacts the other end of each spring clip 7, allowing the other end of each spring clip 7 to extend outside the spring clip hole. In this specific embodiment, the elastic body is a torsion spring.

[0054] More specifically, an upper slider 23 is provided in the upper part of the cartridge recovery tube 6. The upper slider 23 is slidably connected to the cartridge recovery tube 6 through a first elastic cylindrical pin 24. The upper part of the upper slider 23 is connected to the retrieval spearhead 5 through a pin 22. The lower slider 27 is slidably provided in the lower middle part of the cartridge recovery tube 6. The middle part of the lower slider 27 is slidably connected to the cartridge recovery tube 6 through a second elastic cylindrical pin 25. The cartridge 7 is provided in the lower part of the lower slider 27 through a third elastic cylindrical pin 26. The middle part of the torsion spring 28 is connected to the upper part of the lower slider 27 through a pin. The two ends of the torsion spring 28 are respectively connected to the other end of a cartridge 7.

[0055] As the hammer 19 falls along the inner flat drill rod 1 and the landing section 20, the upper end of the spring clip 7 expands outward supported by the torsion spring 28. Under the pressure of the inner walls of the inner flat drill rod 1 and the landing section 20, the upper end of the spring clip 7 overcomes the elastic force of the torsion spring 28 and retracts. When it finally reaches the spring clip shoulder 10, it pops out again. The top surface of the spring clip 7 is stuck on the lower end surface of the spring clip shoulder 10. With the support of the landing ring 8 by the landing shoulder 11, the hammer 19 is stuck in the landing section 20. At this time, the hammer 19 will not move up and down. This ensures that the hammer 19 can press the tension wing drill bit 21 to keep the blade 16 in an open state and prevent it from retracting. This allows the blade 16 to maintain a stable opening angle, ensuring that the inner diameter of the hole remains constant.

[0056] When the steel cable retrieval device 18 is inserted into the inlet, the retrieval hook 4 at the bottom of the steel cable retrieval device 18 clamps the retrieval spearhead 5 and pushes the upper slider 23 downward. Then, the upper slider 23 pushes the lower slider 27 downward. The spring clip recovery tube 6 squeezes the spring clip 7, causing the lower slider 27 and the spring clip 7 to move downward. At the same time, the spring clip 7 retracts and is blocked by the side wall of the spring clip recovery tube 6 and cannot pop out. At this time, the steel cable retrieval device 18 is lifted by the steel cable 2, which drives the weight 19 to move upward, completing the retrieval and recovery of the weight 19.

[0057] The steel cable retrieval device 18 includes a retrieval device body, a rotary single-action mechanism 3, and a retrieval hook 4. The rotary single-action mechanism 3 is located at the top of the retrieval device body; the retrieval hook 4 is located at the bottom of the retrieval device body; a connecting part is located at the top of the rotary single-action mechanism body for connecting to the steel cable 2; the retrieval hook 4 includes at least two hook bodies, the middle of which is rotatably connected to the retrieval device body; an elastic reset element is located between the tops of the hook bodies. In this specific embodiment, the elastic reset element is a helical spring.

[0058] The specific working steps of this drill bit are as follows:

[0059] 1. For example Figure 7 As shown, in its natural state, the wing drill bit 21 is not working. Due to the action of the push rod spring 14, the wing drive push rod 12 of the wing drill bit 21 is subjected to an upward force, at which time the wing 16 is in a closed state. The outer diameter of the wing drill bit 21 is smaller than the diameter of the lower guide drill bit 17, and the drill string relies on the lower guide drill bit 17 to drill the hole.

[0060] 2. For example Figure 8As shown, the hammer 19 is inserted to open the blades 16 of the winged drill bit 21. Because the weight of the hammer 19 is greater than the force of the push rod spring 14 inside the winged drill bit 21, the blade drive push rod 12 moves downwards, and the blades 16 are pushed into the open state by the protruding push plate on the blade drive push rod 12. The hammer 19 is located inside the settling section 20, and the settling ring 8 is in contact with the settling shoulder 11. The settling shoulder 11 supports the settling ring 8, and the spring clip 7 is ejected outwards under the elastic force of the torsion spring, engaging with the spring clip shoulder 10, thus locking the hammer 19 inside the settling section 20, thereby keeping the blades 16 in the winged drill bit 21 in the open state.

[0061] 3. For example Figure 9 As shown, the hammer 19 is being retrieved, and the cutting edge 16 is being recovered. After the wing drill bit 21 completes its predetermined workload, a steel cable retrieval device 18 is inserted from the upper inner horizontal drill rod 1. The retrieval hook 4 at the bottom of the steel cable retrieval device 18 engages with the retrieval spearhead 5 of the hammer 19. The hammer 19 spearhead has a differential characteristic; when the retrieval device pulls the spearhead, the pipe connected to the spearhead compresses the spring clip 7 to recover it. After recovering the spring clip 7, the hammer 19 can be quickly retrieved using the steel cable 2 to recover the cutting edge 16 of the wing drill bit 21.

[0062] 4. For example Figure 10 As shown, the hammer 19 is retrieved, and the wing drill bit 21 returns to its original state. After the hammer 19 is lifted by the steel cable retrieval device 18, the push rod spring 14 inside the wing drill bit 21, due to compression and energy storage, drives the blade drive push rod 12 to move upward, retracting the blade 16 and returning to its original state.

[0063] 5. At this point, the expansion and recovery cycle of the wing 16 of the wing drill bit 21 is completed.

[0064] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0065] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A deep-sea drilling rig with casing installation system, characterized in that, The system includes a casing connection sub, a feed tool, a cable retriever, a counterweight, a landing sub, a winged drill bit, and a pilot drill bit. The feed tool is housed within the casing connection sub. The top of the feed tool is connected to the upper drill pipe. The bottom of the casing connection sub is connected to the casing. The lower end of the winged drill bit is connected to the upper end of the pilot drill bit. The upper end of the winged drill bit is connected to the lower end of the landing sub. The upper end of the landing sub is connected to the inner horizontal drill pipe. The counterweight is located inside the landing sub and the inner horizontal drill pipe, and is used to extend the blades on the winged drill bit. The upper end of the steel cable retrieval device is connected to one end of the steel cable, and the bottom of the steel cable retrieval device is used to connect to the top of the counterweight; the wing drill bit includes a housing, a blade, a blade drive push rod, and an elastic element; the housing is a hollow rod; the lower middle part of the housing has multiple through holes along the circumference, and the upper middle part of the housing has a stepped hole above the through holes; the top of the through holes is rotatably connected to the top of the blade; the side of the blade facing the inside of the housing has a guide groove in the upper middle part of the blade, and the lower part of the guide groove gradually extends towards the center of the housing. The inclined surface extends; a laterally extending push plate is provided at the bottom of the blade drive push rod; the push plate matches the guide groove; a limiting ring is provided in the upper middle part of the blade drive push rod, and an elastic element is provided on the blade drive push rod between the limiting ring and the bottom surface of the stepped hole; a first internal thread for connecting with the landing section is provided at the top of the housing, and a second internal thread for connecting with the guide drill bit is provided at the bottom of the housing; the counterweight includes a retrieval spearhead, a spring clip recovery tube, a spring clip, a landing ring, and a counterweight section; a certain feature is provided at the top of the counterweight section. The device comprises a landing ring; a spring clip retrieval tube is provided above the landing ring; a retrieval spearhead is provided above the spring clip retrieval tube; a plurality of through spring clip holes are provided circumferentially in the lower middle part of the spring clip retrieval tube; one end of a plurality of spring clips is rotatably connected to the bottom of the spring clip holes inside the spring clip retrieval tube, and each spring clip corresponds to one spring clip hole; the middle part of an elastic body is connected to the top of the spring clip holes inside the spring clip retrieval tube; the end of the elastic body contacts the other end of the spring clip, and the elastic body is used to allow the other end of the spring clip to extend outside the spring clip hole.

2. The deep-sea drilling casing installation system according to claim 1, characterized in that, The feeding tool includes a feeding tool section, a feeding tool body, a spring, a sliding block, a sleeve, a drive ring, and a sleeve weight pin. The upper and lower outer walls of the feeding tool section are threaded. The upper part of the feeding tool section is used to connect to the upper drill pipe; the lower part of the feeding tool section is used to connect to the inner flat drill pipe. The feeding tool body is fitted into the middle of the feeding tool section. A drive ring is located inside the feeding tool body on the outer wall of the middle portion of the feeding tool section. A sliding block is located inside the feeding tool body. The upper surface of the sliding block and the lower surface of the drive ring are mutually mating inclined surfaces. The sleeve weight pin is located on the side of the sliding block away from the drive ring. Furthermore, the end of the bearing sleeve weight pin furthest from the sliding block passes through the feeding tool body; the spring is provided between the bearing sleeve weight pin and the inner wall of the feeding tool body; a limiting groove is provided on the inner wall of the sleeve connecting section, and the end of the bearing sleeve weight pin furthest from the sliding block matches the limiting groove; the bottom of the sleeve connecting section is connected to the top of the sleeve through a reducing pipe.

3. The deep-sea drilling casing installation system according to claim 2, characterized in that, A blade limiting mechanism is provided on the outer wall of the housing at the top of the through hole; the blade limiting mechanism includes a limiting plate, the top of the limiting plate is detachably connected to the housing, and the bottom of the limiting plate is provided with a limiting inclined surface facing the housing. After the blade is opened, it is pressed against the limiting inclined surface to limit the maximum opening angle of the blade.

4. The deep-sea drilling casing installation system according to claim 3, characterized in that, The elastic element is a helical spring.

5. The deep-sea drilling casing installation system according to claim 4, characterized in that, The positioning section includes a tube body; the top of the tube body is provided with a third internal thread for connecting with the inner flat drill rod; the bottom of the tube body is provided with a first external thread for connecting with the wing drill bit; a positioning shoulder is provided in the middle of the tube body; and a spring-loaded shoulder is provided in the upper part of the tube body.

6. The deep-sea drilling casing installation system according to claim 5, characterized in that, The elastic body is a torsion spring.

7. The deep-sea drilling casing installation system according to claim 6, characterized in that, The steel cable retrieval device includes a retrieval device body, a rotary single-action mechanism, and a retrieval hook; the rotary single-action mechanism is provided on the top of the retrieval device body; the retrieval hook is provided on the lower part of the retrieval device body; a connecting part is provided on the top of the rotary single-action mechanism for connecting to the steel cable; the retrieval hook includes at least two hook bodies, the middle part of which is rotatably connected to the retrieval device body; an elastic reset member is provided between the tops of the hook bodies.

8. An operational method based on the deep-sea drilling casing installation equipment system as described in claim 7, characterized in that, Includes the following steps: In the first step, under normal conditions, the wing-type drill bit is not working; Due to the action of the elastic element, the cutter blade drives the push rod of the wing drill bit to be subjected to an upward force, at which time the cutter blade is in a closed state; When the casing and drill string are lowered, the winged drill bit is in a closed state; The second step involves lowering the drill string to the seabed mud surface and deploying a counterweight to open the winged drill bit's cutting edges. Because the weight of the counterweight exceeds the force of the push rod spring inside the winged drill bit, the cutting edges drive the push rod downwards. The cutting edges are then pushed into the open state by the protruding push plate on the push rod. The counterweight is located within the landing section, with the landing ring in contact with the landing shoulder. The landing shoulder supports the landing ring, and the spring clip is ejected outwards under the force of the torsion spring, engaging with the spring clip shoulder and locking the counterweight within the landing section. This keeps the cutting edges of the winged drill bit in the open state. This state is the working state of the winged drill bit when the surface casing is being run in. Because the maximum outer diameter of the winged drill bit's cutting edges is larger than the outer diameter of the casing after opening, wellbore drilling in the casing section can be completed. During this drilling operation, the casing delivery tool remains locked to the casing due to its structural characteristics, causing the casing to move with the drill string. The third step is to retrieve the hammer after the casing is installed in the well section and prepare to recover the cutter wings. After the winged drill bit has completed the predetermined amount of work, a steel cable retrieval device is inserted from the upper inner horizontal drill pipe. The retrieval hook at the bottom of the steel cable retrieval device is connected to the retrieval spearhead of the hammer. The retrieval spearhead has differential characteristics. When the retrieval device pulls the spearhead, the pipe connected to the spearhead will compress the spring clip to retrieve it. After the spring clip is retrieved, the hammer can be quickly retrieved using the steel cable to recover the cutter wings of the winged drill bit. In the fourth step, after the hammer is lifted by the steel cable retrieval device, the push rod spring inside the wing drill bit is compressed and stored, which drives the cutter blade to drive the push rod upward, retracts the cutter blade, and returns it to its original state; the drill string is pressed down and rotated forward to unlock the casing insertion tool, so that the insertion tool sub and the insertion tool body are separated; after separation, the drill string assembly can continue to drill downward to form a second wellbore; Fifth, through the above steps, the expansion and retrieval cycle of the wing of the drill bit is completed, and the locking and unlocking cycle of the feed tool is also completed. At this time, the drill string can be lifted to retrieve the entire set of running casing drilling equipment and complete the well drilling operation.

Images