Deepwater surface conduit delivery tool and operation method thereof

Abstract

The present invention discloses a deepwater surface layer catheter delivery tool and an operation method thereof, the tool comprising: a central shaft with a through central hole; a wedge-shaped sleeve sleeved outside the central shaft, the wedge-shaped sleeve fixed on the central shaft by a release pin, a limited position step arranged in the middle of the wedge-shaped sleeve; a bushing sleeved outside the wedge-shaped sleeve, the bushing and the wedge-shaped sleeve connected by threads, a clamping portion arranged on the outer side of the bushing; a body sleeved outside the bushing, the lower end of the body abutting against the limited position step; a plurality of through radial holes arranged on the body; a push rod arranged in the radial hole, one end of the push rod cooperates with the clamping portion to form a conical matching structure, and the other end is provided with a locking spring; a marking rod capable of synchronous axial movement with the bushing; an anti-rotation pin and a positioning pin arranged on the body. The deepwater surface layer catheter delivery tool and the operation method thereof provided by the present invention are efficient and reliable, and can better meet the use requirements of continuous drilling in jetting operations.

Description

Technical Field

[0001] The invention relates to the technical field of deepwater drilling operations, and in particular to a deepwater surface layer conduit delivery tool and an operation method thereof. Background Art

[0002] Deepwater drilling generally refers to offshore drilling with a water depth of more than 900 meters. In deepwater drilling, the surface pipe is the first layer of casing installed during the entire deepwater oil well construction process. As an important supporting structure pipe for the underwater wellhead, it is used to provide structural support for all subsequent casing and wellhead equipment.

[0003] At present, for deep-water drilling in the ocean, the method of lowering the deep-water surface conduit into the well mainly adopts the deep-water drilling jet method, which uses the impact of high-pressure fluid to form the wellbore, and the delivery tool is directly lowered with the surface conduit. This method reduces the steps of lifting the drilling tool when drilling, and has the characteristics of saving operation time and cost.

[0004] When applying the deepwater drilling jetting method, it is necessary to use an efficient and reliable delivery tool to ensure continuous drilling during the jetting operation. Summary of the invention

[0005] The object of the present invention is to provide an efficient and reliable deep-water surface layer conduit delivery tool and an operation method thereof.

[0006] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0007] A deepwater surface conduit delivery tool, comprising:

[0008] A central shaft for connecting a drill pipe rotary tool, wherein the central shaft has a through central hole;

[0009] A wedge-shaped sleeve is sleeved outside the central shaft, the wedge-shaped sleeve is fixed on the central shaft by a release pin, and a limited step is arranged in the middle of the wedge-shaped sleeve;

[0010] A bushing sleeved outside the wedge-shaped sleeve, the bushing being connected to the wedge-shaped sleeve by threads, and a clamping portion being arranged on the outer side of the bushing;

[0011] A body sleeved outside the bushing, the lower end of the body abutting against the limiting step; the body is provided with a plurality of through radial holes;

[0012] A push rod is arranged in the radial hole, one end of the push rod cooperates with the engaging portion to form a conical matching structure, and the other end of the push rod is provided with a locking spring;

[0013] a marking rod capable of axially moving synchronously with the bushing;

[0014] An anti-rotation pin for preventing the body and the surface conduit from rotating relative to each other;

[0015] A positioning pin is used to prevent the main body and the surface conduit from maintaining a connection state after the release pin is sheared off.

[0016] In a preferred embodiment, the center shaft and the wedge-shaped sleeve are rotated a predetermined number of times driven by the drill pipe rotating tool, so that the sleeve can move downward along the axial direction, pushing the push rod to move radially outward, and the locking spring is locked and connected to the surface conduit.

[0017] In a preferred embodiment, the engaging portion is a groove having a tapered surface, and one end of the push rod is provided with a tapered portion matching the tapered surface.

[0018] In a preferred embodiment, a shear pin is provided between the bushing and the main body. Before the shear pin is sheared, the bushing is in a first position relative to the wedge-shaped sleeve. The lower end of the bushing is spaced a predetermined height from the inner bottom surface of the main body. Within the predetermined height range, the outer surface of the wedge-shaped sleeve is provided with a predetermined number of threads.

[0019] In a preferred embodiment, after the locking spring is locked and connected to the surface conduit, the lower end of the bushing contacts the inner bottom surface of the body.

[0020] In a preferred embodiment, a first limiting portion is provided on the inner side of the lower portion of the wedge-shaped sleeve, and a second limiting portion may be provided on the outer side of the lower portion of the center shaft, and the first limiting portion and the second limiting portion cooperate to form a limiting mechanism that can prevent the center shaft from passing through the wedge-shaped sleeve.

[0021] In a preferred embodiment, the number of the shear pins is 4, which are evenly spaced along the circumferential direction.

[0022] In a preferred embodiment, the number of the anti-rotation pins is 4, which are evenly spaced along the circumferential direction; the number of the positioning pins is 8, which are evenly spaced along the circumferential direction, and after the drill bit is lifted to the design load, the anti-rotation pins and the positioning pins are shear-damaged.

[0023] In a preferred embodiment, the body is provided with a drainage hole for discharging drilling fluid and drill cuttings.

[0024] The method for operating the deepwater surface conduit delivery tool according to any one of the above items comprises:

[0025] Start the drill pipe rotation tool, use the drill tool to drive the central shaft and the wedge-shaped sleeve to rotate a predetermined number of circles, and push the push rod to move radially outward until the locking spring is locked and connected with the surface conduit;

[0026] The deepwater surface conduit delivery tool and the surface conduit are lowered to a first predetermined depth, and then the drilling fluid is pumped through the drilling platform to spray a wellbore;

[0027] After the first wellbore is completed, the deepwater surface conduit delivery tool and the surface conduit are lowered to a second predetermined depth, and after the release pin is sheared off by rotating the drill pipe to reach a preset torque, the center pipe rotates with the drill tool to continue drilling the second wellbore;

[0028] After completing the second wellbore opening, the drilling tool is lifted up to a predetermined position, and then the drilling tool is reversely rotated for a predetermined number of times, so that the push rod is reset and the locking spring is unlocked from the surface conduit;

[0029] The load for lifting the drilling tool is increased to a predetermined value, the anti-rotation pin and the positioning pin are destroyed, the main body is released from the surface conduit, and the deep-water surface conduit delivery tool is recovered.

[0030] In general, the deepwater surface conduit delivery tool and the operation method thereof provided in the embodiments of this specification have the following advantages:

[0031] 1. The present invention can realize the connection between the delivery tool and the deep-water surface conduit. After the deep-water surface conduit is lowered to the designed depth, the drilling tool and the conduit are separated to continue the secondary drilling.

[0032] 2. The present invention ensures tool stability and operational safety by cutting off the anti-rotation pin and the positioning pin to achieve release.

[0033] 3. The invention has the advantages of simple structure, convenient operation and strong practicability, and can better meet the construction and use conditions in complex marine environment.

[0034] Compared with the existing method of achieving control by relying on motion stroke, the technical solution provided by the present application utilizes the structure of the tool itself to ensure the accuracy of control during the operation and is less likely to cause misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a front view of the appearance of a deepwater surface conduit delivery tool in an embodiment of the present application;

[0036] Figure 2 It is a top view of the appearance of a deepwater surface conduit delivery tool in an embodiment of the present application;

[0037] Figure 3 is a half-section diagram of a deepwater surface conduit delivery tool in an embodiment of the present application;

[0038] Figure 4 It is a schematic diagram of the structure of the central axis of a deepwater surface conduit delivery tool in an embodiment of the present application;

[0039] Figure 5 It is a structural schematic diagram of a wedge-shaped sleeve of a deepwater surface catheter delivery tool in an embodiment of the present application;

[0040] Figure 6 It is a structural schematic diagram of a deepwater surface conduit delivery tool bushing in an embodiment of the present application;

[0041] Figure 7 It is a flowchart of the steps of the operation method based on the deep-water surface catheter delivery tool provided in the embodiment of the present application.

[0042] Description of reference numerals:

[0043] 1. Central axis; 11. Second limiting part; 2. Wedge-shaped bushing; 21. Opening; 22. Threaded section; 23. Limiting step; 24. First limiting part; 3. Push rod; 4. Locking spring; 5. Positioning rod; 6. Release pin; 7. Anti-rotation pin; 8. Positioning pin; 9. Main body; 10. Drain hole; 20. Bushing; 201. Engaging part; 202. Internal thread. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that these implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0045] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] Chinese patent specification CN208564436U provides a catheter head delivery tool with a function of continuing drilling. The tool drives the core shaft to lift, lower and rotate through the drill pipe to achieve the locking and unlocking functions of the tool and the catheter head. After the surface catheter is lowered into place, it can be disconnected from the drill string without the need to recover the tool to continue drilling the second wellbore. However, the existing catheter head delivery tool mainly relies on motion stroke to achieve control. When the motion control stroke is not accurately controlled, misoperation is prone to occur.

[0048] The deepwater surface layer conduit delivery tool and the operation method thereof provided by the present invention are efficient and reliable, and can better meet the use requirements of continuous drilling in jetting operations.

[0049] See also Figures 1 to 6 A deepwater surface catheter delivery tool provided in an embodiment of the present application may include: a central shaft 1, a wedge-shaped sleeve 2, a bushing 20, a push rod 3, a locking spring 4, a position indicating rod 5, a release pin 6, an anti-rotation pin 7, a positioning pin 8, and a body 9.

[0050] Among them, the central axis 1 is a rotating spindle, which is mainly used to connect the drill pipe rotating tool. The wedge-shaped sleeve 2 is connected to the central axis 1, and the rotation of the rotating spindle drives the wedge-shaped sleeve 2 to rotate relative to the bushing 20. The axial movement of the bushing 20 causes the push rod 3 to move radially, so that the locking retaining ring 4 locks the delivery tool and the surface catheter. The position indicating rod 5 is mainly used to observe the working status of the delivery tool, which can be observed by ROV (Remote Operated Vehicle). The release pin 6 is mainly used to cut off the release pin 6 to achieve the "secondary drilling" function. The anti-rotation pin 7 is mainly used to prevent relative rotation between the delivery tool and the surface catheter. The positioning pin 8 is mainly used to continue to ensure the connection between the delivery tool and the surface catheter after the release pin 6 is cut off. After all operations are completed, the retaining ring is released by rotation, and then the positioning pin 8 is lifted and cut to achieve tool recovery. The body 9 is used to connect the surface conduit and provide structural support for various mechanisms. A drainage hole 10 is provided on the upper part of the body 9 to facilitate the return of drilling cuttings and to facilitate the observation of the position indicating rod 5.

[0051] The structure and specific working process of each part of the deepwater surface conduit delivery tool are described in detail below with reference to specific drawings.

[0052] Please refer to Figure 4 The central shaft 1 is a hollow variable diameter shaft section as a whole, and the hollow part is a through central hole, and the central hole is used to circulate drilling fluid. The upper part of the central shaft 1 can be provided with a thread (i.e., a thread) for connecting a drill pipe, and the lower part can also be provided with a thread for connecting a drill pipe and a secondary wellbore drilling tool assembly.

[0053] The upper part of the outer wall of the central shaft 1 is provided with a groove for cooperating with the release pin 6. The outer part of the central shaft 1 can be connected with a wedge-shaped sleeve 2 through the release pin 6.

[0054] Please refer to Figure 5 The wedge-shaped sleeve 2 is a hollow variable diameter shaft section as a whole, and the hollow part is a through hole. An opening 21 is provided on the upper part of the wedge-shaped sleeve 2, and the opening 21 is used to pass the release pin 6. Overall, the wedge-shaped sleeve 2 is connected to the central shaft 1 through the release pin 6. The outer wall of the middle part of the wedge-shaped sleeve 2 is provided with a thread, and a bushing 20 is connected by thread matching. A limiting step 23 is formed between the middle and lower parts of the wedge-shaped sleeve 2, and the limiting step 23 is used to axially limit the body 9.

[0055] In addition, the inner side of the lower part of the wedge-shaped sleeve 2 may be provided with a first limiting portion 24, and correspondingly, the outer side of the lower part of the central shaft 1 may be provided with a second limiting portion 11, and the first limiting portion 24 cooperates with the second limiting portion 11 to form a limiting mechanism, which can assist in positioning and prevent the central shaft 1 from being lifted up through the wedge-shaped sleeve 2. When the central shaft 1 is lifted up to a certain extent, the second limiting portion 11 contacts the second limiting portion 11, thereby limiting the central shaft 1 from being further lifted up. Specifically, the first limiting portion 24 may be in the form of a keyway, and the second limiting portion 11 may be in the form of an annular protrusion or a dot-shaped protrusion, etc. Of course, the form of the first limiting portion 24 and the second limiting portion 11 is not limited to the above examples, and the present application does not make the sole limitation here. For example, when the first limiting portion 24 and the second limiting portion 11 are both annular as a whole, the inner diameter of the first limiting portion 24 is smaller than the outer diameter of the second limiting portion 11, so that when the two are in contact, the limiting function can be achieved.

[0056] Please refer to Figure 6 Specifically, the bushing 20 can also be a hollow reducer shaft section as a whole, and the hollow part is a through hole. The bushing 20 is sleeved outside the wedge-shaped sleeve 2. An internal thread 202 for matching with the wedge-shaped sleeve 2 can be provided on the inner side of the lower part of the bushing 20. A clamping portion 201 is formed in the middle part of the bushing 20, and the clamping portion 201 matches with one end of the push rod 3 to form a conical matching structure. Specifically, the clamping portion 201 can be a groove with a conical surface, and the end of the push rod 3 close to the bushing 20 is also provided with a conical portion matching with the conical surface. When the bushing 20 moves axially, the push rod 3 can be pushed outward radially by utilizing the conical matching structure.

[0057] By rotating the central shaft 1, the wedge-shaped sleeve 2 can be driven to rotate relative to the bushing 20, so that the bushing 20 moves axially. When the bushing 20 moves axially relative to the push rod 3, due to the conical matching structure formed between the bushing 20 and the end of the push rod 3, the push rod 3 can be driven to move radially, thereby pushing the locking spring 4 to lock or release.

[0058] The upper part of the bushing 20 may be provided with a mounting portion for mounting the position indicating rod 5. Specifically, the mounting portion may be integrated with the bushing 20 or may be separately disposed at the top of the bushing 20. When the bushing 20 moves axially, the position indicating rod 5 can move axially synchronously with the bushing 20.

[0059] Based on the height position of the position indicating rod 5, the working state of the deepwater surface conduit delivery tool can be observed. Specifically, when the bushing 20 moves downward relative to the wedge-shaped sleeve 2, the push rod 3 and the locking spring 4 move radially outward, and the locking spring 4 is locked and connected with the surface conduit. Since the position indicating rod 5 moves axially synchronously with the bushing 20, whether the locking spring 4 is locked with the surface conduit can be observed through the position of the position indicating rod 5.

[0060] The body 9 is sleeved outside the bushing 20 and is a hollow rotating body. Specifically, the body 9 is provided with a plurality of radial holes extending along the circumferential direction; the locking spring 4 can be arranged in the radial holes of the body 9. The outer side of the body 9 is used to connect the surface conduit and the connector.

[0061] A plurality of anti-rotation pins 7 are arranged along the circumferential direction on the outer wall of the main body 9. The anti-rotation pins 7 can prevent the main body 9 from rotating relative to the surface catheter. Specifically, the number of the anti-rotation pins 7 can be 4, evenly spaced along the circumferential direction, that is, one is arranged every 90°. The diameter of the anti-rotation pin 7 is about 28 mm. When the diameter of the anti-rotation pin 7 is the above value, it can better meet the use requirements. Of course, the number of the anti-rotation pins 7 is not limited to the above examples, and can be less or more. Similarly, the diameter of the anti-rotation pin 7 is not limited to the above size, and can also be adaptively adjusted according to the size of the deep-water surface catheter delivery tool and the size of the surface catheter. The present application does not make specific limitations here.

[0062] A plurality of positioning pins 8 are also arranged along the circumferential direction on the outer wall of the body 9. By arranging the positioning pins 8, the connection between the delivery tool and the surface conduit can be continued after the release pin 6 is cut off, and the centering of the surface conduit can be ensured. After all operations are completed, the retaining spring is released by rotation, and the positioning pin 8 is lifted and cut off to realize tool recovery. Specifically, the number of the positioning pins 8 can be 8, which are evenly spaced along the circumferential direction, that is, one is arranged every 45°. The diameter of the positioning pin 8 is about 20 mm. When the number and size of the positioning pins 8 are the above values, the use requirements can be better met. Of course, the number of the positioning pins 8 is not limited to the above examples, and can be less or more. Similarly, the diameter of the positioning pin 8 is not limited to the above size, and can also be adaptively adjusted according to the size of the deep-water surface conduit delivery tool and the size of the surface conduit. The present application does not make specific limitations here.

[0063] The lower end of the body 9 abuts against the limiting step 23 of the wedge-shaped sleeve 2. A seal may be provided between the inner surface of the lower part of the body 9 and the outer surface of the wedge-shaped sleeve 2 to seal the mating position of the body 9 and the wedge-shaped sleeve 2. The body 9 is also provided with a plurality of drainage holes 10 for returning drilling cuttings.

[0064] A shear pin may also be provided between the inner side of the body 9 and the bushing 20. Before the shear pin is sheared, the bushing 20 is in a first position relative to the wedge-shaped sleeve 2, and the lower end of the bushing 20 is spaced at a predetermined height from the inner bottom surface of the body 9. Within the predetermined height range, the outer surface of the wedge-shaped sleeve 2 is correspondingly provided with a predetermined number of thread segments 22. Specifically, the predetermined number of turns may be 5 turns, 6 turns, 7 turns, 8 turns, 9 turns, or more, or less, and the present application does not limit this exclusively.

[0065] When the upper drill rod is rotating for a predetermined number of times, the central shaft 1 and the wedge-shaped sleeve 2 are driven to rotate relative to the bushing 20 for a predetermined number of times, the lower end of the bushing 20 can just contact the inner bottom surface of the body 9 after the shear pin is sheared off, and at this time, the locking spring 4 is just pushed radially outward into place by the bushing 20. Through the ingenious design of the above structure, the coordinated actions of various components can be accurately controlled to complete the locking connection process of the locking spring 4 and the surface conduit.

[0066] In a specific usage scenario, the upper drill pipe rotates 7 times to drive the wedge-shaped sleeve 2 to rotate, push the push rod 3 to move toward the periphery, push the locking spring 4 to lock and connect with the surface catheter, and observe whether it is locked through the position indicator rod 5. During operation, all are locked and lowered to the predetermined depth together with the center axis 1.

[0067] After reaching the first predetermined depth, the drilling platform pumps drilling fluid to spray the first wellbore, and the drilling fluid and drill cuttings are discharged from the drainage hole 10. The whole set of tools is lowered into the wellbore to the second predetermined depth. The designed torque is reached by rotating the drill pipe to cause shear failure of the release pin 6. The central axis 1 and the drill tool can move freely to continue drilling into the second wellbore.

[0068] After the operation is completed, the drill tool is lifted to the predetermined position, and the wedge-shaped sleeve 2 is rotated 7 times in the reverse direction, leaving space for the push rod 3 to move inward (moving along the radial direction toward the axis), and the locking spring 4 moves inward to unlock the surface conduit. Whether it is unlocked can be observed through the position indicator rod 5. By lifting the drill tool to the designed load, the anti-rotation pin 7 and the positioning pin 8 are sheared and damaged, and the delivery tool body 9 is released from the surface conduit, and the tool is recovered to complete the surface conduit delivery operation.

[0069] The above technical solution adopted in this specification has the following advantages:

[0070] 1. The present invention can realize the connection between the delivery tool and the deep-water surface conduit. After the deep-water surface conduit is lowered to the designed depth, the drilling tool and the conduit are separated to continue the secondary drilling.

[0071] 2. The present invention ensures tool stability and operation safety by shearing off the anti-rotation pin 7 and the positioning pin 8 to achieve release.

[0072] 3. The present invention has a simple structure, is easy to operate, and is highly practical, and can better meet the construction requirements under complex marine environment conditions.

[0073] Compared with the existing method of achieving control by relying on motion stroke, the technical solution provided by the present application utilizes the structure of the tool itself to ensure the accuracy of control during the operation and is less likely to cause misoperation.

[0074] See also Figure 7 Based on the deepwater surface layer catheter delivery tool provided in the above-mentioned embodiment, the present application further provides an operation method based on the deepwater surface layer catheter delivery tool, which may include the following steps:

[0075] Step S10: Start the drill pipe rotation tool, use the drill tool to drive the central shaft 1 and the wedge-shaped sleeve 2 to rotate a predetermined number of circles, and push the push rod 3 to move radially outward until the locking spring 4 is locked and connected with the surface conduit;

[0076] Step S12: After the deepwater surface conduit delivery tool and the surface conduit are lowered to a first predetermined depth, drilling fluid is pumped through the drilling platform to spray a wellbore;

[0077] Step S14: After the first wellbore is opened, the deepwater surface conduit delivery tool and the surface conduit are lowered to a second predetermined depth, and after the release pin 6 is sheared off by rotating the drill pipe to reach a preset torque, the central pipe rotates with the drill tool to continue drilling the second wellbore;

[0078] Step S16: after completing the second wellbore opening, the drilling tool is lifted up to a predetermined position, and then the drilling tool is reversely rotated for a predetermined number of times, so that the push rod 3 is reset and the locking spring 4 is unlocked from the surface conduit;

[0079] Step S18: increasing the load for lifting the drilling tool to a predetermined value, destroying the anti-rotation pin 7 and the positioning pin 8, releasing the body 9 from the surface conduit, and recovering the deepwater surface conduit delivery tool.

[0080] The present invention provides an operating method based on a deep-water surface catheter delivery tool, in which the various components used can refer to the specific description of the above-mentioned deep-water surface catheter delivery tool, and the present application will not repeat them here. On the whole, the operating method based on the deep-water surface catheter delivery tool can achieve the same technical effect as the deep-water surface catheter delivery tool, that is, it can be efficient and reliable, and better meet the operational requirements of continuous drilling in jet operations.

[0081] Any numerical value cited herein includes all values ​​of lower and upper values ​​that increase by one unit from the lower limit to the upper limit, and there is at least a two-unit interval between any lower value and any higher value. For example, if the value of the quantity of a component or a process variable (such as temperature, pressure, time, etc.) is stated to be from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be clearly expressed, and it can be considered that all possible combinations of numerical values ​​listed between the lowest value and the highest value are clearly stated in this specification in a similar manner.

[0082] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. "About" or "approximately" used with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.

[0083] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0084] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0085] The above-mentioned various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0086] The above are only several embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the above contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the embodiments without departing from the spirit and scope disclosed by the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. A deepwater surface conduit delivery tool, characterized in that: include: A central shaft for connecting a drill pipe rotary tool, wherein the central shaft has a through central hole; A wedge-shaped sleeve is sleeved outside the central shaft, the wedge-shaped sleeve is fixed on the central shaft by a release pin, and a limited step is arranged in the middle of the wedge-shaped sleeve; A bushing sleeved outside the wedge-shaped sleeve, the bushing being connected to the wedge-shaped sleeve by threads, and a clamping portion being arranged on the outer side of the bushing; A body sleeved outside the bushing, the lower end of the body abutting against the limiting step; the body is provided with a plurality of through radial holes; A push rod is arranged in the radial hole, one end of the push rod cooperates with the engaging portion to form a conical matching structure, and the other end of the push rod is provided with a locking spring; a marking rod capable of axially moving synchronously with the bushing; An anti-rotation pin for preventing the body and the surface conduit from rotating relative to each other; A positioning pin for preventing the main body and the surface conduit from maintaining a connection state after the release pin is sheared off; The central shaft and the wedge-shaped sleeve are rotated a predetermined number of times under the drive of the drill pipe rotating tool, so that the bushing can move downward along the axial direction, push the push rod to move radially outward, and the locking clip is locked and connected with the surface conduit; The engaging portion is a groove having a conical surface, and one end of the push rod is provided with a conical portion matching the conical surface; A shear pin is provided between the bushing and the body. Before the shear pin is sheared, the bushing is in a first position relative to the wedge-shaped sleeve. The lower end of the bushing is spaced a predetermined height from the inner bottom surface of the body. Within the predetermined height range, the outer surface of the wedge-shaped sleeve is provided with a predetermined number of threads.

2. The deepwater surface conduit delivery tool according to claim 1, characterized in that: After the locking clamp is locked and connected to the surface conduit, the lower end of the bushing contacts the inner bottom surface of the body.

3. The deepwater surface conduit delivery tool according to claim 1, characterized in that: A first limiting portion is provided on the inner side of the lower portion of the wedge-shaped sleeve, and a second limiting portion is provided on the outer side of the lower portion of the central shaft. The first limiting portion and the second limiting portion cooperate to form a limiting mechanism that can prevent the central shaft from passing through the wedge-shaped sleeve.

4. The deepwater surface conduit delivery tool according to claim 1, characterized in that: The number of the shear pins is 4, which are evenly spaced along the circumferential direction.

5. The deepwater surface conduit delivery tool according to claim 1, characterized in that: The number of the anti-rotation pins is 4, which are evenly spaced along the circumferential direction; the number of the positioning pins is 8, which are evenly spaced along the circumferential direction. After the drill bit is lifted to the designed load, the anti-rotation pins and the positioning pins are shear-damaged.

6. The deepwater surface conduit delivery tool according to claim 1, characterized in that: The body is provided with a drainage hole for discharging drilling fluid and drill cuttings.

7. The method for operating a deepwater surface conduit delivery tool according to any one of claims 1 to 6, characterized in that: include: Start the drill pipe rotation tool, use the drill tool to drive the central shaft and the wedge-shaped sleeve to rotate a predetermined number of circles, and push the push rod to move radially outward until the locking spring is locked and connected with the surface conduit; The deepwater surface conduit delivery tool and the surface conduit are lowered to a first predetermined depth, and then the drilling fluid is pumped through the drilling platform to spray a wellbore; After the first wellbore is completed, the deepwater surface conduit delivery tool and the surface conduit are lowered to a second predetermined depth, and after the release pin is sheared off by rotating the drill pipe to reach a preset torque, the center pipe rotates with the drill tool to continue drilling the second wellbore; After completing the second wellbore opening, the drilling tool is lifted up to a predetermined position, and then the drilling tool is reversely rotated for a predetermined number of times, so that the push rod is reset and the locking spring is unlocked from the surface conduit; The load for lifting the drilling tool is increased to a predetermined value, the anti-rotation pin and the positioning pin are destroyed, the main body is released from the surface conduit, and the deep-water surface conduit delivery tool is recovered.

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