Load-bearing capacity transfer method and transfer device for offshore oil production platform and drilling platform

Abstract

The present invention provides a method and device for transferring the bearing capacity of an offshore oil production platform and a drilling platform. The watertight pipe and the bearing capacity transfer device for the drilling platform include: a connecting rod body, which can transmit vertical loads; a drilling platform connecting plate connected to the first end of the connecting rod body, which can be fixedly connected to the drilling platform; and a watertight pipe connecting structure connected to the second end of the connecting rod body, which can be fixedly connected to the watertight pipe. Through the present invention, the ultimate bearing capacity of the drilling platform is increased, providing safety protection for subsequent development.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore oil production equipment, and in particular to a method and a device for transferring the bearing capacity of an offshore oil production platform and a drilling platform. Background Art

[0002] Drilling platforms are important equipment for offshore oil and gas exploration and development. Most drilling platforms adopt the structure of jacket platforms. At present, the requirements for increasing the number of wellheads and equipment on existing drilling platforms have been put forward, which puts higher requirements on the bearing capacity of existing drilling platforms. Existing drilling platforms, due to insufficient depth of pile legs into the mud, sometimes cannot provide sufficient bearing capacity for subsequent development operations of the drilling platform. Summary of the invention

[0003] The purpose of the present invention is to provide a method and a device for transferring the bearing capacity of an offshore oil production platform and a drilling platform, so as to increase the ultimate bearing capacity of the drilling platform and provide safety guarantee for subsequent development.

[0004] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0005] The present invention provides a device for transferring the bearing force of a water-blocking duct and a drilling platform, comprising: a connecting rod body, which can transmit vertical loads; a drilling platform connecting plate connected to the first end of the connecting rod body, which can be fixedly connected to the drilling platform; and a water-blocking duct connecting structure connected to the second end of the connecting rod body, which can be fixedly connected to the water-blocking duct.

[0006] In a preferred embodiment, the watertight duct connection structure includes a socket sleeve, a cylindrical pedestal and a locking mechanism, and the second end of the connecting rod body is connected to the socket sleeve; the cylindrical pedestal is sleeved outside the watertight duct and fixedly connected to the watertight duct, and an annular cavity is provided between the cylindrical pedestal and the side wall of the watertight duct; the socket sleeve is sleeved outside the watertight duct and inserted into the annular cavity, and the locking mechanism locks the socket sleeve and the cylindrical pedestal.

[0007] In a preferred embodiment, the locking mechanism includes a retaining spring, which has a tendency to expand outward; the outer wall of the socket sleeve is provided with a retaining spring accommodating groove, and the retaining spring is arranged in the retaining spring accommodating groove; the inner wall of the cylindrical support is provided with a first boss, and the socket sleeve can drive the retaining spring to move to the bottom of the first boss, and the retaining spring abuts against the first boss.

[0008] In a preferred embodiment, a disassembly threaded hole is provided on the cylindrical support, and the disassembly threaded hole is located below the first boss. A disassembly bolt screwed to the disassembly threaded hole can push the retaining spring to retract inward to the inner side of the first boss.

[0009] In a preferred embodiment, the socket sleeve is provided with a second boss located on the top wall of the retaining spring receiving groove, and the retaining spring is provided with a third boss located on the inner side of the second boss.

[0010] In a preferred embodiment, the watertight conduit connection structure includes a conductive gasket disposed at the bottom of the annular cavity, and the socket sleeve abuts against the conductive gasket.

[0011] In a preferred embodiment, the socket sleeve is provided with an anti-rotation pin for preventing the socket sleeve from rotating relative to the cylindrical support platform.

[0012] In a preferred embodiment, the first end of the connecting rod body is hinged to the drilling platform connecting plate, and the second end of the connecting rod body is hinged to the watertight conductor connecting structure.

[0013] In a preferred embodiment, the connecting rod body includes an intermediate rod, a first rod connected to the first end of the intermediate rod, and a second rod connected to the second end of the intermediate rod; the first rod is provided with a cylindrical hole extending along the length direction of the rod, and the intermediate rod is inserted into the cylindrical hole; the second rod is threadedly connected to the intermediate rod, and rotating the intermediate rod relative to the second rod can make the intermediate rod move relative to the second rod along the length direction of the rod.

[0014] In a preferred embodiment, the watertight conductor and the drilling platform load-bearing force transfer device includes a load sensor, and the load sensor is arranged in the cylindrical hole and can abut against the intermediate rod.

[0015] The present invention provides an offshore oil production platform, comprising: a drilling platform, a water-blocking pipe and the above-mentioned water-blocking pipe and drilling platform bearing capacity transfer device; the drilling platform connecting plate in the water-blocking pipe and drilling platform bearing capacity transfer device is fixedly connected to the drilling platform, and the water-blocking pipe connecting structure in the water-blocking pipe and drilling platform bearing capacity transfer device is fixedly connected to the water-blocking pipe.

[0016] The present invention provides a method for transferring the bearing capacity of a drilling platform, comprising: using the above-mentioned water-resistant pipe and the drilling platform bearing capacity transfer device; fixing the water-resistant pipe and the drilling platform connecting plate in the bearing capacity transfer device of the drilling platform to the drilling platform; fixing the water-resistant pipe and the water-resistant pipe connecting structure in the bearing capacity transfer device of the drilling platform to the water-resistant pipe.

[0017] The characteristics and advantages of the present invention are:

[0018] By adopting the watertight duct and the bearing capacity transfer device for the drilling platform to connect the watertight duct and the drilling platform, the watertight duct can be used as a bearing structure. The excess bearing capacity of the watertight duct can be utilized to transfer the load of the drilling platform to the watertight duct, thereby increasing the ultimate bearing capacity of the drilling platform and providing safety protection for subsequent development.

[0019] The watertight pipe and drilling platform load-bearing capacity transfer device can be applied to an existing drilling platform to increase the ultimate load-bearing capacity of the drilling platform by transferring the load to the watertight pipe.

[0020] The watertight riser and the drilling platform bearing capacity transfer device can also be applied to newly built drilling platforms. During the oil well design and development process, the watertight riser is used to increase the ultimate bearing capacity of the drilling platform, which is beneficial to reduce the design strength of the drilling platform's pile legs, reduce the design cost, processing cost, use and maintenance cost of the drilling platform, and can greatly reduce the marginal oil field development cost, effectively achieving the goal of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of the water-blocking pipe and the bearing capacity transfer device of the drilling platform provided by the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of a first state of installing a watertight duct connection structure in a load-bearing transfer device shown;

[0024] Figure 3 for Figure 1 A schematic diagram of a second state of installing a watertight duct connection structure in the load-bearing transfer device shown;

[0025] Figure 4 for Figure 1 A schematic diagram of a third state of installing a watertight duct connection structure in the load-bearing transfer device shown;

[0026] Figure 5 for Figure 1 A schematic diagram of disassembling the socket in the load transfer device shown;

[0027] Figure 6 for Figure 1 A schematic structural diagram of a cylindrical cap in a bearing force transfer device shown;

[0028] Figure 7 for Figure 1 A schematic diagram of the structure of a retaining spring in a load-bearing force transfer device shown;

[0029] Figure 8 for Figure 1 A schematic structural diagram of the first arc cylinder in the load-bearing force transfer device shown;

[0030] Fig. 9 for Figure 1 A schematic structural diagram of the second arc cylinder in the load-bearing force transfer device shown;

[0031] Fig.10 for Figure 1 A schematic diagram of the structure of the socket sleeve in the load-bearing force transfer device shown;

[0032] Fig.11 for Figure 1 An exploded schematic diagram of the connecting rod body in the load transfer device shown.

[0033] Description of Figure Numbers:

[0034] 10. Drilling platform; 20. Riser;

[0035] 30, connecting rod body; 301, first end of connecting rod body; 302, second end of connecting rod body; 303, rod length direction;

[0036] 31. first rod; 311. cylindrical hole; 32. second rod; 33. middle rod; 34. load sensor;

[0037] 351, first ear plate; 352, second ear plate; 353, third ear plate; 354, fourth ear plate;

[0038] 40. Drilling platform connection plate;

[0039] 50. Waterproof pipe connection structure;

[0040] 51, cylindrical support; 511, annular cavity; 512, first boss; 513, annular welding portion;

[0041] 52, socket sleeve; 521, retaining groove for retaining spring; 522, second boss; 523, third boss;

[0042] 5241, first arc cylinder; 5242, second arc cylinder; 5243, welding ear plate;

[0043] 53. Locking mechanism; 531. Circlip;

[0044] 541. Remove the threaded hole; 542. Remove the bolt;

[0045] 55. Anti-rotation pin; 56. Conductive gasket. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Embodiment 1

[0048] The present invention provides a water conduit and a bearing force transfer device for a drilling platform 10, such as Figure 1 As shown, the load-bearing force transfer device includes: a connecting rod body 30, a drilling platform connecting plate 40 and a watertight duct connecting structure 50, the connecting rod body 30 can transmit vertical loads; the drilling platform connecting plate 40 is connected to the first end 301 of the connecting rod body, and the drilling platform connecting plate 40 can be fixedly connected to the drilling platform 10; the watertight duct connecting structure 50 is connected to the second end 302 of the connecting rod body, and the watertight duct connecting structure 50 can be fixedly connected to the watertight duct 20.

[0049] By adopting the load-bearing transfer device to connect the watertight duct 20 with the drilling platform 10, the watertight duct 20 can be used as a load-bearing structure. The excess load-bearing capacity of the watertight duct 20 can be utilized to transfer the load of the drilling platform 10 to the watertight duct 20, thereby increasing the ultimate load-bearing capacity of the drilling platform 10 and providing safety protection for subsequent development.

[0050] The load-bearing capacity transfer device can be applied to an already built drilling platform 10 to increase the ultimate load-bearing capacity of the drilling platform 10 by transferring the load to the watertight conductor 20 .

[0051] The bearing capacity transfer device can also be applied to a newly built drilling platform 10. During the oil well design and development process, the ultimate bearing capacity of the drilling platform 10 can be increased through the water-tight pipe 20, which is beneficial to reduce the design strength of the pile legs of the drilling platform 10, reduce the design cost, processing cost, use and maintenance cost of the drilling platform 10, and can greatly reduce the marginal oil field development cost, effectively achieving the goal of reducing costs and increasing efficiency.

[0052] like Figure 1 As shown, the connecting rod body 30 can be tilted relative to the vertical direction, and the first end 301 of the connecting rod body to the second end 302 of the connecting rod body are tilted from top to bottom relative to the vertical direction, so as to connect the watertight conductor 20 and the drilling platform 10, and transmit the vertical bearing force.

[0053] The drilling platform connecting plate 40 and the drilling platform 10 are in face-to-face contact and have a large contact surface, which can effectively solve the problem of stress concentration in the process of load-bearing force transfer. The structural form in which the drilling platform connecting plate 40 is fixed to the drilling platform 10 is not limited to one, for example, the two can be fixed by bolts or connected by welding. Preferably, the drilling platform connecting plate 40 is arranged below the drilling platform 10 and welded to the drilling platform 10 to facilitate the transfer of load-bearing force; more preferably, the drilling platform connecting plate 40 is arranged in the horizontal direction.

[0054] The structural form in which the watertight duct connection structure 50 is fixed to the watertight duct 20 is not limited to one, for example: in one embodiment, the watertight duct connection structure 50 includes a connecting plate, the second end 302 of the connecting rod body is connected to the connecting plate, the connecting plate is arranged on the side wall of the watertight duct 20, and the connecting plate is fixed to the side wall of the watertight duct 20 by screws or welding; in another embodiment, the watertight duct connection structure 50 includes a cylinder, the second end 302 of the connecting rod body is connected to the cylinder, the cylinder is sleeved on the outside of the watertight duct 20, and the cylinder is fixed to the side wall of the watertight duct 20 by screws or welding.

[0055] Affected by wind and waves, relative movement may occur between the riser 20 and the drilling platform 10, including vertical and horizontal movement. The relative movement between the riser 20 and the drilling platform 10 may interfere with the stability of the connection between the two and the transmission of bearing capacity.

[0056] In order to better transfer the bearing capacity, the inventors have made further improvements to the watertight pipe connection structure 50: Figure 1 and Figure 6 As shown, the watertight pipe connection structure 50 includes a socket 52, a cylindrical support 51 and a locking mechanism 53. The second end 302 of the connecting rod body is connected to the socket 52; the cylindrical support 51 is sleeved outside the watertight pipe 20 and fixed to the watertight pipe 20, and an annular cavity 511 is provided between the cylindrical support 51 and the side wall of the watertight pipe 20; the socket 52 is sleeved outside the watertight pipe 20 and inserted into the annular cavity 511, and the locking mechanism 53 locks the socket 52 and the cylindrical support 51. Figure 2 to Figure 4As shown, when the load-bearing transfer device is used, the cylindrical support 51 can be first installed on the watertight pipe 20, the annular cavity 511 opens upward, the socket 52 can be inserted into the annular cavity 511 from top to bottom, the cylindrical support 51 radially limits the socket 52, and the bottom of the annular cavity 511 supports the socket 52. After the socket 52 is installed in place, the locking mechanism 53 is locked. The watertight pipe connection structure 50 has the following advantages: (1) The matching structure between the cylindrical support 51 and the watertight pipe 20 is annular, which is conducive to the uniform transfer of the load of the cylindrical support 51 to the watertight pipe 20. The load-bearing capacity of the drilling platform 10 is transferred to the watertight pipe 20 through the connecting rod body 30, the socket and the cylindrical support 51, which is conducive to the uniform transfer of the load to the vertical load of the watertight pipe 20, and the vertical load is distributed along the circumference of the watertight pipe 20, which effectively alleviates the stress concentration on the watertight pipe 20. (2) The drilling platform 10 and the watertight pipe 20 are often subjected to reciprocating loads, that is, the loads they are subjected to will fluctuate at a relatively high frequency. The cylindrical support 51 and the socket 52 are assembled structures. When subjected to reciprocating loads, the assembly gap between the cylindrical support 51 and the socket 52 will produce a certain buffering effect and will not easily cause fatigue damage. (3) In the watertight pipe connection structure 50, the socket 52 and the cylindrical support 51 can be disassembled and assembled, which is more convenient for the installation, disassembly and maintenance of the load-bearing transfer device.

[0057] The fixing method between the cylindrical support 51 and the watertight pipe 20 is not limited to one, for example, it can be fixed by screws, or it can be fixed by welding. Preferably, the cylindrical support 51 and the watertight pipe 20 are fixed by welding; further, the welding position between the cylindrical support 51 and the watertight pipe 20 is set at the bottom of the cylindrical support 51, and a ring welding method is adopted to form a ring-shaped ring welding part 513, which is conducive to making the force between the watertight pipe 20 between the cylindrical support 51 more evenly distributed in the circumferential direction, and reducing the stress concentration caused by the welding structure problem on the watertight pipe 20.

[0058] The structure of the locking mechanism 53 is not limited to one, for example, the locking mechanism 53 may include a set screw threaded on the cylindrical support 51, the set screw abuts against the socket 52, and the socket 52 and the cylindrical support 51 can be locked. In order to lock more stably and transmit the bearing force, in one embodiment of the present invention, Figure 4 , Figure 6 and Fig.10As shown, the locking mechanism 53 includes a snap spring 531, which has a tendency to expand outward; the outer wall of the socket 52 is provided with a snap spring receiving groove 521, and the snap spring 531 is arranged in the snap spring receiving groove 521; the inner wall of the cylindrical support 51 is provided with a first boss 512, and the socket 52 can drive the snap spring 531 to move to the bottom of the first boss 512, and the snap spring 531 abuts against the first boss 512. When the snap spring 531 abuts against the bottom of the first boss 512, the first boss 512 can prevent the snap spring 531 from withdrawing upward, and since the snap spring 531 is accommodated in the snap spring receiving groove 521 of the socket 52, the socket 52 is prevented from moving upward. The socket sleeve 52 and the cylindrical support 51 are locked by a retaining spring 531, which can ensure the reliability of locking and facilitate installation; at the same time, the assembly gap can allow the socket sleeve 52 and the cylindrical support 51 to perform a relatively small range of movement, produce a buffering effect, and are not prone to fatigue damage.

[0059] Specifically, the clamping spring 531 may be in the shape of a ring with a notch, and the notch allows the clamping spring 531 to shrink inward. In order to conveniently sleeve the clamping spring 531 outside the watertight conduit 20, the clamping spring 531 may be in the shape of a semicircular ring; a plurality of semicircular ring-shaped clamping springs 531 may be circumferentially distributed in the clamping spring receiving groove 521.

[0060] Furthermore, a disassembly threaded hole 541 is provided on the cylindrical support 51, and the disassembly threaded hole 541 is located below the first boss 512. A disassembly bolt 542 screwed to the disassembly threaded hole 541 can push the retaining spring 531 to retract inward to the inner side of the first boss 512. Figure 5 As shown, by removing the bolt 542, the retaining spring 531 is pushed inward to retract to the inner side of the first boss 512, that is, the outer diameter of the retaining spring 531 is smaller than the inner diameter of the first boss 512, and the retaining spring 531 is separated from the first boss 512. At this time, the first boss 512 cannot block the retaining spring 531, and the retaining spring 531 and the socket sleeve 52 can move upward relative to the cylindrical base 51 and withdraw from the annular cavity 511, so as to facilitate the removal of the socket sleeve 52 and the connecting rod body 30 from the watertight duct 20, so as to facilitate the later maintenance or repair and replacement of the watertight duct 20.

[0061] Specifically, a plurality of disassembly bolt 542 holes may be circumferentially arranged on the cylindrical support 51 , so that the plurality of disassembly bolts 542 can push the retaining spring 531 inwardly to contract together, so that the retaining spring 531 is separated from the first boss 512 .

[0062] like Figure 4 and Figure 7As shown, the socket sleeve 52 is provided with a second boss 522 located on the top wall of the retaining spring receiving groove 521, and the retaining spring 531 is provided with a third boss 523 located inside the second boss 522. When the retaining spring 531 expands outward, the third boss 523 moves to abut against the second boss 522. The second boss 522 can be annular, and the annular second boss 522 surrounds the third boss 523. By providing the second boss 522 and the third boss 523, the connection between the retaining spring 531 and the socket sleeve 52 can be made more reliable.

[0063] In order to better transfer the bearing force, the watertight duct connection structure 50 includes a conductive gasket 56 arranged at the bottom of the annular cavity 511, and the socket sleeve 52 abuts against the conductive gasket 56. The socket sleeve 52 transfers the downward force to the cylindrical base 51 through the conductive gasket 56. The conductive gasket 56 can reduce the impact and make the force acting on the cylindrical base 51 and the watertight duct 20 more stable, thereby transferring the bearing force to the watertight duct 20 and reducing the interference caused to the watertight duct 20.

[0064] like Figure 4 and Fig.10 As shown, the socket sleeve 52 is provided with an anti-rotation pin 55 for preventing the socket sleeve 52 from rotating relative to the cylindrical support 51. Specifically, the cylindrical support 51 is provided with an anti-rotation groove that cooperates with the anti-rotation pin 55, and the anti-rotation groove extends along the axial direction of the cylindrical support 51. The anti-rotation pin 55 can move along the axial direction of the cylindrical support 51 in the anti-rotation groove, and at the same time, the anti-rotation pin 55 abuts against the inner wall of the anti-rotation groove, thereby preventing the socket sleeve 52 from rotating.

[0065] In one embodiment of the present invention, the first end 301 of the connecting rod body is hinged to the drilling platform connecting plate 40, and the second end 302 of the connecting rod body is hinged to the watertight pipe connecting structure 50, so that the connecting rod body 30 can rotate relative to the drilling platform 10, and the connecting rod body 30 can rotate relative to the watertight pipe 20. Compared with the rigid connection, this embodiment has a movement margin and can play a buffering role. On the one hand, it is convenient to assemble during installation, and on the other hand, when the drilling platform 10 and the watertight pipe 20 move relative to each other due to the influence of wind and waves, this embodiment can reduce the interference of the drilling platform 10 on the watertight pipe 20.

[0066] Specifically, the first end 301 of the connecting rod body is provided with a first ear plate 351, and the drilling platform connecting plate 40 is provided with a second ear plate 352 that cooperates with the first ear plate 351. The first ear plate 351 and the second ear plate 352 are connected by a first bolt, and the first ear plate 351 and the second ear plate 352 can rotate relative to each other around the first bolt; the second end 302 of the connecting rod body is provided with a third ear plate 353, and the watertight duct 20 connecting plate is provided with a fourth ear plate 354 that cooperates with the third ear plate 353. The third ear plate 353 and the fourth ear plate 354 are connected by a second bolt, and the third ear plate 353 and the fourth ear plate 354 can rotate relative to each other around the second bolt; the first bolt is parallel to the second bolt and is perpendicular to the rod length direction 303 of the connecting rod body 30. Preferably, the first bolt is arranged in the horizontal direction, perpendicular to the axial direction of the watertight duct 20. In order to prevent the first bolt from withdrawing from the first ear plate 351 and the second ear plate 352, a stop pin is provided at the end of the first bolt; in order to prevent the second bolt from withdrawing from the third ear plate 353 and the fourth ear plate 354, a stop pin is provided at the end of the second bolt.

[0067] In order to facilitate the sleeve of the spigot 52 to be mounted outside the watertight pipe 20, the inventor has improved the structure of the spigot 52: the spigot 52 adopts a spliced ​​structure, such as Figure 8 to Figure 10 As shown, the socket cylinder 52 includes a first arc cylinder 5241 and a second arc cylinder 5242, both of which are semi-cylindrical, and can be assembled into a cylindrical shape, and the fourth ear plate 354 is arranged on the first arc cylinder 5241; the first arc cylinder 5241 and the second arc cylinder 5242 are respectively provided with welding ear plates 5243, and bolts are connected to the welding ear plates 5243, so that the first arc cylinder 5241 and the second arc cylinder 5242 can be locked together. In order to facilitate the sleeve of the cylindrical support 51 on the outside of the watertight pipe 20, the cylindrical support 51 can adopt a splicing structure, and the cylindrical support 51 with a splicing structure can be composed of at least two arc cylinders.

[0068] In one embodiment of the present invention, the connecting rod body 30 includes an intermediate rod 33, a first rod 31 connected to a first end of the intermediate rod 33, and a second rod 32 connected to a second end of the intermediate rod 33; Fig.11As shown, the first rod 31 is provided with a cylindrical hole 311 extending along the rod length direction 303, and the middle rod 33 is inserted into the cylindrical hole 311; the second rod 32 is threadedly connected to the middle rod 33, and the middle rod 33 is rotated relative to the second rod 32, so that the middle rod 33 can move relative to the second rod 32 along the rod length direction 303, so as to adjust the overlapping length between the middle rod 33 and the second rod 32, thereby adjusting the length of the connecting rod body 30, so as to adjust the bearing capacity transferred between the drilling platform 10 and the watertight conductor 20 through the connecting rod body 30, so as to facilitate adjustment to the calculated appropriate load range; the load can also be unloaded as needed to reduce the transferred bearing capacity to zero to achieve actual working conditions. The first rod 31 and the middle rod 33 are matched with each other through the cylindrical hole 311. The middle rod 33 can be extended and retracted in the cylindrical hole 311. Pressure can be transmitted between the first rod 31 and the middle rod 33, and the two can move freely in relatively distant directions. In this way, when the drilling platform 10 and the water-proof pipe 20 are affected by the external environment and move relative to each other, it can avoid that the two apply tension through the load-bearing transfer device, thereby reducing interference between the two.

[0069] like Figure 1 As shown, the load-bearing force transfer device of the riser 20 and the drilling platform 10 includes a load sensor 34. The load sensor 34 is arranged in the cylindrical hole 311 and can abut against the middle rod 33. The load sensor 34 can measure the magnitude of the load-bearing force transmitted by the load-bearing force transfer device, so as to detect the load-bearing force transfer status in real time. The load-bearing capacity of the riser 20 is limited. Through detection, it is convenient to make the transferred load-bearing force within a reasonable range, so as to avoid the load-bearing force transferred by the drilling platform 10 from causing damage to the load-bearing structure of the riser 20, so as to avoid damage to the drilling platform 10 or the riser 20.

[0070] Embodiment 2

[0071] The present invention provides an offshore oil production platform, which comprises: a drilling platform 10, a water-tight riser 20 and a load-bearing transfer device between the water-tight riser 20 and the drilling platform 10; a drilling platform connecting plate 40 in the load-bearing transfer device between the water-tight riser 20 and the drilling platform 10 is fixedly connected to the drilling platform 10, and a water-tight riser connecting structure 50 in the load-bearing transfer device between the water-tight riser 20 and the drilling platform 10 is fixedly connected to the water-tight riser 20.

[0072] In the offshore oil production platform, the load-bearing transfer device connects the watertight pipe 20 with the drilling platform 10, so that the watertight pipe 20 can be used as a load-bearing structure. The excess load-bearing capacity of the watertight pipe 20 is utilized to transfer the load of the drilling platform 10 to the watertight pipe 20, so as to increase the ultimate load-bearing capacity of the drilling platform 10 and provide safety guarantee for subsequent development. In the process of oil well design and development, increasing the ultimate load-bearing capacity of the drilling platform 10 through the watertight pipe 20 is conducive to reducing the design strength of the pile legs of the drilling platform 10, reducing the design cost, processing cost, use and maintenance cost of the drilling platform 10, and can greatly reduce the development cost of marginal oil fields, effectively achieving the purpose of reducing costs and increasing efficiency.

[0073] Embodiment 3

[0074] The present invention provides a method for transferring the bearing capacity of a drilling platform 10, which includes: using the above-mentioned water-resistant pipe 20 and the bearing capacity transfer device of the drilling platform 10; fixing the water-resistant pipe 20 and the drilling platform connecting plate 40 in the bearing capacity transfer device of the drilling platform 10 to the drilling platform 10; fixing the water-resistant pipe 20 and the water-resistant pipe connecting structure 50 in the bearing capacity transfer device of the drilling platform 10 to the water-resistant pipe 20.

[0075] By adopting a bearing capacity transfer method, the bearing capacity transfer device connects the watertight duct 20 and the drilling platform 10, so that the watertight duct 20 can be used as a bearing structure. The excess bearing capacity of the watertight duct 20 is utilized to transfer the load of the drilling platform 10 to the watertight duct 20, so as to increase the ultimate bearing capacity of the drilling platform 10.

[0076] The above are only several embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A device for transferring bearing capacity of a water-resistant pipe and a drilling platform, characterized in that: include: A connecting rod body, wherein the connecting rod body can transmit vertical load; A drilling platform connecting plate connected to the first end of the connecting rod body, wherein the drilling platform connecting plate can be fixedly connected to the drilling platform; A watertight duct connection structure connected to the second end of the connecting rod body, wherein the watertight duct connection structure can be fixedly connected to the watertight duct; The watertight pipe connection structure comprises a socket, a cylindrical support and a locking mechanism, and the second end of the connecting rod body is connected to the socket; The cylindrical support is sleeved outside the water-blocking conduit and fixedly connected to the water-blocking conduit, and an annular cavity is provided between the cylindrical support and the side wall of the water-blocking conduit; The socket sleeve is sleeved outside the water-blocking conduit and inserted into the annular cavity, and the locking mechanism locks the socket sleeve and the cylindrical support platform; The locking mechanism includes a retaining spring, and the retaining spring has a tendency to expand outwards; The outer wall of the socket sleeve is provided with a retaining spring receiving groove, and the retaining spring is arranged in the retaining spring receiving groove; The inner wall of the cylindrical support is provided with a first boss, and the socket sleeve can drive the clamping spring to move below the first boss, and the clamping spring abuts against the first boss.

2. The watertight pipe and drilling platform load-bearing capacity transfer device according to claim 1 is characterized in that: A disassembly threaded hole is provided on the cylindrical support, and the disassembly threaded hole is located below the first boss. A disassembly bolt screwed to the disassembly threaded hole can push the retaining spring to retract inward to the inner side of the first boss.

3. The watertight pipe and drilling platform load-bearing capacity transfer device according to claim 1, characterized in that: The socket sleeve is provided with a second boss located on the top wall of the retaining spring receiving groove, and the retaining spring is provided with a third boss located on the inner side of the second boss.

4. The device for transferring the bearing capacity of a watertight pipe and a drilling platform according to claim 1, characterized in that: The watertight pipe connection structure includes a conductive gasket arranged at the bottom of the annular cavity, and the socket sleeve abuts against the conductive gasket.

5. The device for transferring the bearing capacity of a watertight pipe and a drilling platform according to claim 1, characterized in that: The socket sleeve is provided with an anti-rotation pin for preventing the socket sleeve from rotating relative to the cylindrical support platform.

6. The device for transferring the bearing capacity of a watertight pipe and a drilling platform according to claim 1, characterized in that: The first end of the connecting rod body is hinged to the drilling platform connecting plate, and the second end of the connecting rod body is hinged to the watertight pipe connecting structure.

7. The device for transferring the bearing capacity of a watertight pipe and a drilling platform according to claim 1, characterized in that: The connecting rod body includes an intermediate rod, a first rod connected to a first end of the intermediate rod, and a second rod connected to a second end of the intermediate rod; The first rod is provided with a cylindrical hole extending along the length direction of the rod, and the intermediate rod is inserted into the cylindrical hole; The second rod is threadedly connected to the intermediate rod. Rotating the intermediate rod relative to the second rod can cause the intermediate rod to move relative to the second rod along the length direction of the rod.

8. The device for transferring the bearing capacity of a watertight pipe and a drilling platform according to claim 7, characterized in that: The water-proof pipe and the bearing force transfer device of the drilling platform include a load sensor, and the load sensor is arranged in the cylindrical hole and can abut against the intermediate rod.

9. An offshore oil production platform, characterized in that: include: A drilling platform, a riser and the riser and drilling platform load-bearing transfer device described in any one of claims 1 to 8; the drilling platform connecting plate in the riser and drilling platform load-bearing transfer device is fixedly connected to the drilling platform, and the riser connecting structure in the riser and drilling platform load-bearing transfer device is fixedly connected to the riser.

10. A method for transferring bearing capacity of a drilling platform, characterized in that: include: The water-blocking pipe and the drilling platform load-bearing force transfer device according to any one of claims 1 to 8; The water-blocking pipe and the drilling platform connecting plate in the drilling platform load-bearing force transfer device are fixedly connected to the drilling platform; The watertight pipe and the watertight pipe connecting structure in the drilling platform load-bearing force transfer device are fixedly connected to the watertight pipe.

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