Marine oil well riser recovery support frame and use method thereof

Abstract

The present invention provides a support frame for recovering a riser in an offshore oil well and a method for using the same. The first and second H-beam main supports are constructed of H-shaped steel cross-sections. One long side of each H-beam is mounted on the riser deck. The first and second H-beam main supports span the load-bearing beams surrounding the wellhead on the riser deck to support the weight of the casing. Connecting structures are evenly formed on the inner walls of the two long sides of the H-beam on each support, allowing the first and second H-beam main supports to be connected using the connecting structures and auxiliary support structures. This support frame can safely and effectively recover large-sized risers, meets force requirements, and is easy to install and disassemble.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore oilfield engineering, and more particularly to an offshore oil well riser recovery support frame and a use method thereof. Background Art

[0002] During offshore permanent well abandonment operations, during the riser recovery phase, the large size of the riser, mostly 20-36 inches, often prevents normal recovery due to the small through-hole of the workover rig turntable. This causes the operation to stagnate and become difficult, affecting normal operations. In order to recover the riser normally, we can reduce and avoid a large amount of abnormal operation time caused by problems such as the small through-hole of the workover rig turntable, limited lifting space, and high operation risks on the offshore wellhead platform.

[0003] At present, the configuration selection of offshore oil wellhead platform workover rigs is basically 90 tons to 180 tons, and the parameters of the rotary table are mostly ZP175-ZP275, which cannot meet the normal recovery operation of the 30-inch water-resistant conductor. Summary of the Invention

[0004] The present invention overcomes the deficiencies in the prior art and provides a marine oil well riser recovery support frame and a method of using the same. The support frame can safely and effectively recover large-sized risers, meets force requirements, and is easy to install and disassemble.

[0005] The purpose of the present invention is achieved through the following technical solutions.

[0006] An offshore oil well riser recovery support frame includes a main support structure, an auxiliary support structure and a connection structure.

[0007] The main support structure includes a first H-shaped steel main support and a second H-shaped steel main support. The first H-shaped steel main support and the second H-shaped steel main support adopt an H-shaped steel cross section. One long side of the H-shaped steel of the first H-shaped steel main support and the second H-shaped steel main support is installed on the watertight pipe deck. The first H-shaped steel main support and the second H-shaped steel main support can span the load-bearing beam surrounding the wellhead of the watertight pipe deck to bear the weight of the casing. Connecting structures are evenly formed on the inner walls of the two long sides of the H-shaped steel of the first H-shaped steel main support and the second H-shaped steel main support to achieve the purpose of connecting the first H-shaped steel main support and the second H-shaped steel main support by using the connecting structure and the auxiliary support structure;

[0008] The auxiliary support structure includes a first upper auxiliary support, a second upper auxiliary support, a first lower auxiliary support and a second lower auxiliary support. The first lower auxiliary support, the first upper auxiliary support, the second upper auxiliary support and the second lower auxiliary support are sequentially arranged from the left side to the right side of the first H-shaped steel main support. The head and tail ends of the first upper auxiliary support and the second upper auxiliary support are respectively connected to the upper planes of the first H-shaped steel main support and the second H-shaped steel main support, and are used to support sleeve elevators and balance force. The head and tail ends of the first lower auxiliary support and the second lower auxiliary support are respectively connected to the lower planes of the first H-shaped steel main support and the second H-shaped steel main support, and are used to fix and stabilize the entire support frame.

[0009] The support bracket has a first end and a second end which are connected to the support bracket to form a support hole, and the support bracket has a second end and a second end which are connected to the support bracket to form a support hole.

[0010] The first lower auxiliary support and the second lower auxiliary support are laterally overlapped with the center of the platform deck load-bearing beam to achieve the purpose of evenly distributing the force of the support frame and increasing the force-bearing area of ​​the support frame.

[0011] The upper auxiliary support positioning ear plate and the lower auxiliary support positioning ear plate have the same structure, both including a positioning ear plate and a positioning ear plate back plate, the lower surface of the positioning ear plate back plate is fixedly connected to the inner wall of one long side of the H-shaped steel of the first H-shaped steel main support and the second H-shaped steel main support, the number of the positioning ear plates is 2, and the 2 positioning ear plates are relatively arranged on the upper surface of the positioning ear plate back plate, and a pin hole is formed at the center of the positioning ear plate.

[0012] The specifications of the first H-shaped steel main support and the second H-shaped steel main support are: H400×400×13×21mm, and the length is 3000mm. The specifications of the first upper auxiliary support, the second upper auxiliary support, the first lower auxiliary support and the second lower auxiliary support are: 200×12mm, and the length is 889mm. The diameter of the pin is 47mm.

[0013] The distance between the center line of the first lower auxiliary support and the center line of the second lower auxiliary support is 2350 mm.

[0014] The sizes of the first upper auxiliary support, the second upper auxiliary support, the first lower auxiliary support and the second lower auxiliary support are determined according to the sizes of the riser and casing elevators. The distance between the center lines of the first H-beam main support, the second H-beam main support, the first lower auxiliary support and the center line of the second lower auxiliary support is selected according to the sizes of the platform deck main beam and the wellhead support beam.

[0015] A method for using a marine oil well riser recovery support frame is performed according to the following steps:

[0016] Step 1: Installation of support frame

[0017] (1) Place two H-shaped steel main supports and four auxiliary supports in a grid pattern around the riser;

[0018] (2) Align the connection parts of the two lower auxiliary supports and the two H-beam main supports in sequence, and connect the two lower auxiliary supports and the two H-beam main supports with latches and safety pins;

[0019] (3) Align the connection parts of the two upper auxiliary supports and the two H-shaped steel main supports in sequence, and connect the two upper auxiliary supports and the two H-shaped steel main supports with latches and safety pins;

[0020] Step 2: Disassembly of the support frame

[0021] (1) Remove the safety pins of all connecting pins;

[0022] (2) Knock out the connecting pins between the two H-shaped steel main supports and the four auxiliary supports in sequence and recycle them;

[0023] (3) The various components of the disassembled support frame can be recycled.

[0024] The beneficial effects of the present invention are: the support frame has a simple structure, is easy to process, and has a low investment cost; the support frame has good application prospects and can be used in conjunction with all current marine platform well repair rigs or cranes to recover watertight pipes; the support frame adopts pin connection, which is simple to assemble and disassemble and easy to lift; the support frame is highly maneuverable, safe and reliable; during the recovery process of the watertight pipe, the watertight pipe deck cleans the marine growth on the casing surface, which is safer and more operational. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 Schematic diagram of the structure of the connecting ear plate in the present invention, wherein A is a schematic diagram of the distribution structure of the connecting ear plate on the H-shaped steel main support, and B is a schematic diagram of the structure of the connecting ear plate;

[0027] Figure 3 Schematic diagram of the structure of the auxiliary support in the present invention, wherein A is a side view of the auxiliary support and B is a top view of the auxiliary support;

[0028] Figure 4 It is a photo of the actual object of the present invention;

[0029] In the figure: 1 is the first H-shaped steel main support; 2 is the second H-shaped steel main support; 3 is the first upper auxiliary support; 4 is the second upper auxiliary support; 5 is the first lower auxiliary support; 6 is the second lower auxiliary support; 7 is the pin hole; 8 is the latch; 9 is the upper auxiliary support positioning ear plate; 10 is the lower auxiliary support positioning ear plate; 11 is the positioning ear plate; 12 is the positioning ear plate back plate; 13 is the auxiliary support connecting ear plate through-pin hole; 14 is the auxiliary support connecting ear plate.

[0030] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below through specific embodiments.

[0032] Example 1

[0033] An offshore oil well riser recovery support frame includes a main support structure, an auxiliary support structure and a connection structure.

[0034] The main support structure includes a first H-shaped steel main support 1 and a second H-shaped steel main support 2. The first H-shaped steel main support 1 and the second H-shaped steel main support 2 are H-shaped steel in cross section. One long side of the H-shaped steel of the first H-shaped steel main support 1 and the second H-shaped steel main support 2 is installed on the watertight pipe deck. The first H-shaped steel main support 1 and the second H-shaped steel main support 2 can span the load-bearing beam surrounding the wellhead of the watertight pipe deck to bear the weight of the casing. Connecting structures are evenly formed on the inner walls of the two long sides of the H-shaped steel of the first H-shaped steel main support 1 and the second H-shaped steel main support 2 to achieve the purpose of connecting the first H-shaped steel main support 1 and the second H-shaped steel main support 2 by using the connecting structure and the auxiliary support structure;

[0035] The auxiliary support structure includes a first upper auxiliary support 3, a second upper auxiliary support 4, a first lower auxiliary support 5 and a second lower auxiliary support 6. The first lower auxiliary support 5, the first upper auxiliary support 3, the second upper auxiliary support 4 and the second lower auxiliary support 5 are arranged in sequence from the left side to the right side of the first H-beam main support 1. The head and tail ends of the first upper auxiliary support 3 and the second upper auxiliary support 4 are respectively connected to the upper planes of the first H-beam main support 1 and the second H-beam main support 2, and are used to support the sleeve elevators and balance the force. The head and tail ends of the first lower auxiliary support 5 and the second lower auxiliary support 6 are respectively connected to the lower planes of the first H-beam main support 1 and the second H-beam main support 2, and are used to fix and stabilize the entire support frame;

[0036] The connecting structure includes an upper auxiliary support positioning ear plate 9, a lower auxiliary support positioning ear plate 10, a latch 8 and an auxiliary support connecting ear plate 14. The upper auxiliary support positioning ear plate 9 is arranged on the upper plane of the inner wall of one long side of the H-shaped steel of the first H-shaped steel main support 1 and the second H-shaped steel main support 2, and the lower auxiliary support positioning ear plate 10 is arranged on the lower plane of the inner wall of one long side of the H-shaped steel of the first H-shaped steel main support 1 and the second H-shaped steel main support 2. A pin hole 7 is formed at the center of the upper auxiliary support positioning ear plate 9 and the lower auxiliary support positioning ear plate 10, and auxiliary support connecting ear plates 14 are respectively provided at the head and tail ends of the first upper auxiliary support 3, the second upper auxiliary support 4, the first lower auxiliary support 5 and the second lower auxiliary support 6. An auxiliary support connecting ear plate through-pin hole 13 is formed at the center of the auxiliary support connecting ear plate 14. After the latch 8 passes through the pin hole 7 and the auxiliary support connecting ear plate through-pin hole 13, the purpose of connecting the H-shaped steel main support with the auxiliary support is achieved by using the latch 8.

[0037] Example 2

[0038] On the basis of the first embodiment, the first lower auxiliary support 5 and the second lower auxiliary support 6 are laterally overlapped with the center of the platform deck load-bearing beam to achieve the purpose of evenly distributing the force of the support frame and increasing the force-bearing area of ​​the support frame.

[0039] The upper auxiliary support positioning ear plate 9 and the lower auxiliary support positioning ear plate 10 have the same structure, both including a positioning ear plate 11 and a positioning ear plate back plate 12. The lower surface of the positioning ear plate back plate 12 is fixedly connected to the inner wall of one long side of the H-shaped steel of the first H-shaped steel main support 1 and the second H-shaped steel main support 2. The number of positioning ear plates 11 is 2, and the two positioning ear plates 11 are relatively arranged on the upper surface of the positioning ear plate back plate 12, and a pin hole 7 is formed at the center of the positioning ear plate 11.

[0040] The specifications of the first H-shaped steel main support 1 and the second H-shaped steel main support 2 are: H400×400×13×21mm, and the length is 3000mm. The specifications of the first upper auxiliary support 3, the second upper auxiliary support 4, the first lower auxiliary support 5 and the second lower auxiliary support 6 are: 200×12mm, and the length is 889mm. The diameter of the pin 8 is 47mm.

[0041] The distance between the center line of the first lower auxiliary support 5 and the center line of the second lower auxiliary support 6 is 2350 mm.

[0042] The sizes of the first upper auxiliary support 3, the second upper auxiliary support 4, the first lower auxiliary support 5 and the second lower auxiliary support 6 are determined according to the sizes of the watertight conductor and the casing hanger. The distance between the center line of the first H-shaped steel main support 1, the second H-shaped steel main support 2, the first lower auxiliary support 5 and the center line of the second lower auxiliary support 6 is selected according to the sizes of the platform deck main beam and the wellhead support beam.

[0043] Example 3

[0044] A method for using a marine oil well riser recovery support frame is performed according to the following steps:

[0045] Step 1: Installation of support frame

[0046] (1) Place two H-shaped steel main supports and four auxiliary supports in a grid pattern around the riser;

[0047] (2) Align the connection parts of the two lower auxiliary supports and the two H-beam main supports in sequence, and connect the two lower auxiliary supports and the two H-beam main supports with latches and safety pins;

[0048] (3) Align the connection parts of the two upper auxiliary supports and the two H-shaped steel main supports in sequence, and connect the two upper auxiliary supports and the two H-shaped steel main supports with latches and safety pins;

[0049] Step 2: Disassembly of the support frame

[0050] (1) Remove the safety pins of all connecting pins;

[0051] (2) Knock out the connecting pins between the two H-shaped steel main supports and the four auxiliary supports in sequence and recycle them;

[0052] (3) The various components of the disassembled support frame can be recycled.

[0053] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0054] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.

[0055] The present invention has been described in detail above, but the contents described are only preferred embodiments of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A marine oil well riser recovery support frame, characterized by: Including main supporting structure, auxiliary supporting structure and connecting structure, The main support structure includes a first H-shaped steel main support and a second H-shaped steel main support. The first H-shaped steel main support and the second H-shaped steel main support are H-shaped steel in cross section. One long side of the H-shaped steel of the first H-shaped steel main support and the second H-shaped steel main support is installed on the riser deck. The first H-shaped steel main support and the second H-shaped steel main support can span the load-bearing beam surrounding the wellhead of the riser deck to bear the weight of the casing. Connecting structures are evenly formed on the inner walls of the two long sides of the H-shaped steel of the first H-shaped steel main support and the second H-shaped steel main support to achieve the purpose of connecting the first H-shaped steel main support and the second H-shaped steel main support by using the connecting structure and the auxiliary support structure; The auxiliary support structure includes a first upper auxiliary support, a second upper auxiliary support, a first lower auxiliary support, and a second lower auxiliary support. The first lower auxiliary support, the first upper auxiliary support, the second upper auxiliary support, and the second lower auxiliary support are sequentially arranged from the left side to the right side of the first H-beam main support. The first upper auxiliary support and the second upper auxiliary support are respectively connected at their ends to the upper planes of the first H-beam main support and the second H-beam main support, and are used to bear casing elevators and balance forces. The first lower auxiliary support and the second lower auxiliary support are respectively connected at their ends to the lower planes of the first H-beam main support and the second H-beam main support, and are used to fix and stabilize the entire support frame. The connecting structure includes an upper auxiliary support positioning ear plate, a lower auxiliary support positioning ear plate, a latch and an auxiliary support connecting ear plate, the upper auxiliary support positioning ear plate is arranged on the upper plane of the inner wall of one long side of the H-shaped steel of the first H-shaped steel main support and the second H-shaped steel main support, the lower auxiliary support positioning ear plate is arranged on the lower plane of the inner wall of one long side of the H-shaped steel of the first H-shaped steel main support and the second H-shaped steel main support, a pin hole is formed at the center of the upper auxiliary support positioning ear plate and the lower auxiliary support positioning ear plate, the auxiliary support connecting ear plates are respectively arranged at the head and tail ends of the first upper auxiliary support, the second upper auxiliary support, the first lower auxiliary support and the second lower auxiliary support, and an auxiliary support connecting ear plate through-pin hole is formed at the center of the auxiliary support connecting ear plate, and after the latch passes through the pin hole and the auxiliary support connecting ear plate through-pin hole, the purpose of connecting the main support structure with the auxiliary support structure by using the latch is achieved.

2. The offshore oil well riser recovery support frame according to claim 1, characterized in that: The first lower auxiliary support and the second lower auxiliary support are laterally overlapped with the center of the platform deck load-bearing beam to achieve the purpose of evenly distributing the force of the support frame and increasing the force-bearing area of ​​the support frame.

3. The offshore oil well riser recovery support frame according to claim 1, characterized in that: The upper auxiliary support positioning ear plate and the lower auxiliary support positioning ear plate have the same structure, both including a positioning ear plate and a positioning ear plate back plate, the lower surface of the positioning ear plate back plate is fixedly connected to the inner wall of one long side of the H-shaped steel of the first H-shaped steel main support and the second H-shaped steel main support, the number of the positioning ear plates is 2, and the 2 positioning ear plates are relatively arranged on the upper surface of the positioning ear plate back plate, and a pin hole is formed at the center of the positioning ear plate.

4. The offshore oil well riser recovery support frame according to claim 1, characterized in that: The specifications of the first H-shaped steel main support and the second H-shaped steel main support are: H400×400×13×21mm, and the length is 3000mm. The specifications of the first upper auxiliary support, the second upper auxiliary support, the first lower auxiliary support and the second lower auxiliary support are: 200×12mm, and the length is 889mm. The diameter of the pin is 47mm.

5. The offshore oil well riser recovery support frame according to claim 1, characterized in that: The distance between the center line of the first lower auxiliary support and the center line of the second lower auxiliary support is 2350 mm.

Images