Underwater sand accumulation prevention large composite oil and gas equipment protective cover and oil and gas equipment protection structure

Abstract

The present application relates to the technical field of underwater oil and gas equipment protection, and particularly relates to a large underwater sand accumulation prevention composite material oil and gas equipment protection cover and an oil and gas equipment protection structure; the protection cover is made of composite material, and a patrol opening, an observation opening, a sea pipe outlet, a hose outlet and a hoisting hole are arranged on the cover body; the sea pipe outlet and the hose outlet are respectively through the bottom of the cover body; a rotatable opening patrol cabin door is arranged on the patrol opening, and a rotatable opening observation cabin door is arranged on the observation opening; the outer wall of the cover body is smooth; foam reinforcing ribs are arranged on the inner side wall of the cover body in transverse and longitudinal directions; the underwater sand accumulation prevention large composite material oil and gas equipment protection cover is designed to solve the technical problems that a small part of the existing protection covers are imported from abroad, the design size is small, the function is single, and the outer rib plate protection cover is prone to sand accumulation in the surface rib frame when used on the seabed, which causes the sand accumulation on the surface of the protection cover to continuously increase.

Description

Technical Field

[0001] This invention relates to the field of underwater oil and gas equipment protection technology, and in particular to a large composite material protective cover and protective structure for underwater sand-proof oil and gas equipment. Background Technology

[0002] Most underwater oil and gas production facilities use steel structure protection devices, which are large in size, heavy, difficult to design and mold, require anodizing for corrosion protection, are expensive, and are difficult for underwater robots to operate to open and close hatch covers. Furthermore, they require coordination with a base plate to achieve their protective function, making them unsuitable for post-construction protection of underwater oil and gas facilities. A small number use composite material protective covers, which are small in size and have limited functionality. These are mostly formed by combining composite materials and steel, requiring separate anodizing protection for the steel structural components, resulting in high costs and failing to meet the needs of rapid industry development. Additionally, existing external stiffener plate protective covers are prone to sand accumulation within the surface stiffeners during seabed use, leading to a continuous increase in sand buildup on the protective cover surface.

[0003] Furthermore, when the protective cover is in position, it is not easy to observe the actual installation from the hatch. The hinge connection is prone to falling off the surface of the composite material shell after long-term use.

[0004] Therefore, in order to address the above problems, the present invention urgently needs to provide a large composite material protective cover and protective structure for oil and gas equipment to prevent underwater sand accumulation. Summary of the Invention

[0005] The purpose of this invention is to provide a large-scale underwater sand-proof composite material protective cover for oil and gas equipment and a protective structure for oil and gas equipment. The design of the large-scale underwater sand-proof composite material protective cover for oil and gas equipment solves the technical problems of existing technologies where a small number of imported composite material protective covers are small in size, have limited functions, and are prone to sand accumulation inside the surface ribs when used on the seabed, resulting in a continuous increase in sand accumulation on the surface of the protective cover.

[0006] This invention provides a protective cover for large-scale composite material oil and gas equipment for underwater sand accumulation prevention, comprising a cover body made of composite material, the cover body having an inspection port, an observation port, a subsea pipeline outlet, a hose outlet and a hoisting hole, the subsea pipeline outlet and the hose outlet respectively communicating with the bottom of the cover body; the inspection port is equipped with a rotatable inspection hatch, the observation port is equipped with a rotatable observation hatch, the outer wall of the cover body is smooth, and the inner side wall of the cover body is provided with horizontal and vertical foam reinforcing ribs.

[0007] Preferably, the foam reinforcing ribs are filled with polyurethane; the foam reinforcing ribs are integrally formed with the cover.

[0008] Preferably, it includes two opposing inspection doors, each inspection door is provided with at least one grab bar embedding groove, the ROV grab bar of the inspection door is embedded in the grab bar embedding groove, and the two ends of the ROV grab bar of the inspection door are fixedly connected to the inner wall of the grab bar embedding groove.

[0009] Preferably, the inspection hatch is provided with a locking pin insertion groove, and a locking pin is embedded in the locking pin insertion groove. The locking pin passes through the inspection hatch and is inserted and fixed to the inner wall of the inspection port. The locking pin includes a pin rod that passes through the inspection hatch, and a handle extending laterally is provided on the side wall of one end of the pin rod.

[0010] Preferably, the enclosure includes a top plate, and the top plate has a downwardly extending side plate around its circumference. The bottom of the side plate has an outwardly extending flange, and the included angle between the side plate and the top plate is an obtuse angle. The inspection port is located on the top plate, and the observation port, the subsea pipeline outlet, and the hose outlet are located on the side plate. The subsea pipeline outlet and the hose outlet are symmetrically arranged on the left and right.

[0011] Preferably, the edge of the subsea pipeline outlet is provided with an outwardly extending subsea pipeline baffle, and the circumference of the hose outlet is provided with an outwardly extending hose baffle.

[0012] Preferably, the front and rear side plates are symmetrically provided with lifting holes.

[0013] Preferably, the top plate is provided with a guide positioning hole, a guide plug is inserted into the guide positioning hole, the top of the guide plug is provided with a guide plug groove, a guide plug ROV gripper is provided in the guide plug groove, and the two ends of the guide plug ROV gripper are fixedly connected to the inside of the guide plug groove.

[0014] Preferably, the guide plug includes an insertion section that passes through the guide positioning hole, the top of the insertion section is provided with a stop portion, and the guide plug groove is located at the top of the stop portion; the longitudinal section of the insertion section is an inverted triangle.

[0015] The inspection hatch is equipped with a door hinge sleeve C on one side, and a door hinge B is installed inside the door hinge sleeve C. It also includes two door hinge pin seats A located on both sides of the door hinge sleeve C. The two ends of the door hinge B are connected to each door hinge pin seat A respectively, and each door hinge pin seat A is also connected to the inspection hatch and the cover respectively.

[0016] The enclosure is 19.2m long and 11.8m wide; it is made of glass fiber and vinyl ester resin through a vacuum infusion process.

[0017] The present invention also provides a protective structure for oil and gas equipment, including an underwater sand-proof large composite material protective cover and a base as described in any one of the above-mentioned methods, wherein the cover is detachably connected to the base via a detachable connector.

[0018] The underwater sand-prevention and sand-accumulation large composite material protective cover and protective structure for oil and gas equipment provided by this invention have the following advantages compared with the prior art:

[0019] 1. The underwater sand-resistant large composite material protective cover for oil and gas equipment provided by this invention solves the technical problem of existing composite material protective covers having a simple structure and external stiffeners that easily accumulate sand within the surface ribs when used on the seabed, causing a continuous increase in sand accumulation on the protective cover surface. The cover body is made of composite material and does not require anodizing protection; the combination of the inspection port and inspection hatch facilitates access to the inside of the cover for maintenance of oil and gas equipment; the combined design of the observation port and observation hatch facilitates observation of the inside of the cover; the subsea pipeline outlet and hose outlet facilitate the laying and extension of subsea pipelines and hoses; at the same time, the design of the built-in reinforcing ribs not only increases the rigidity of the cover body, but also makes the outer wall of the cover body smooth, preventing sand and dust from accumulating. The smooth surface allows all sand to slide down and be washed away, ensuring that fishing nets and other equipment will not be dragged onto the surface of the cover body 1, causing the cover body 1 to be pulled and damaged.

[0020] 2. The foam reinforcing ribs of the present invention are filled with polyurethane; the foam reinforcing ribs are integrally formed with the cover body; the inner ribs are formed with a rigid foam sandwich structure to ensure that the inner and outer covers are completely covered by the composite material layer. The foam reinforcing ribs save fiber usage and reduce the weight of the cover body while meeting the strength requirements, ensuring the stability of the protective cover structure and adapting to the pressure in deep water.

[0021] 3. This invention features a guide positioning hole on the top plate, into which a guide plug is inserted. The top of the guide plug has a guide plug groove, and within the groove is a guide plug ROV gripper. Both ends of the guide plug ROV gripper are fixedly connected to the inside of the guide plug groove. The guide positioning hole facilitates the installation and fixation of the cover, improving installation efficiency and saving costs. The guide plug ensures that quicksand will not enter the protective cover through the guide positioning hole, thus preventing interference with the normal operation of oil and gas equipment. The guide plug ROV gripper facilitates gripping, improving work efficiency. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram (three-dimensional view) of the underwater sand-proof and sand-stabilizing large composite material protective cover for oil and gas equipment as described in this invention.

[0024] Figure 2 This is a schematic diagram (top view) of the underwater sand-prevention and sand-stabilizing large composite material protective cover for oil and gas equipment as described in this invention.

[0025] Figure 3This is a schematic diagram (bottom view) of the underwater sand-prevention and sand-stabilizing large composite material protective cover for oil and gas equipment as described in this invention.

[0026] Figure 4 This is a schematic diagram (three-dimensional view) of the inspection hatch described in this invention.

[0027] Figure 5 This is a schematic diagram (three-dimensional view) of the guide plug described in this invention.

[0028] Figure 6 This is a schematic diagram (three-dimensional view) of the protective structure for oil and gas equipment described in this invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Enclosure; 101. Top plate; 102. Side plate; 103. Flanged edge; 2. Inspection port; 3. Observation port; 4. Subsea pipeline outlet; 5. Hose outlet; 6. Inspection hatch door; 7. Observation hatch door; 8. Foam reinforcing rib; 9. Grab bar embedded groove; 10. Inspection door ROV grab bar; 11. Locking pin embedded groove; 12. Locking pin; 121. Pin rod; 122. Handle; 13. Subsea pipeline baffle; 14. Hose baffle; 15. 16. Lifting hole; 17. Guide positioning hole; 18. Guide plug; 19. Guide plug groove; 20. Insertion section; 21. Stop; 22. Door hinge pin seat A; 23. Door hinge B; 24. Door hinge sleeve C; 25. Door hinge pin seat E; 26. Door hinge F; 27. Door hinge sleeve G; 28. Guide plug groove; 19. Insertion section; 20. Stop; 21. Base. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this embodiment provides a protective cover for a large composite material oil and gas equipment for underwater sand accumulation prevention, including a cover body 1 made of composite material. The cover body 1 is provided with an inspection port 2, an observation port 3, a subsea pipeline outlet 4, a hose outlet 5, and a hoisting hole 15. The subsea pipeline outlet 4 and the hose outlet 5 are respectively connected to the bottom of the cover body 1. An inspection hatch 6 that can be rotated and opened is installed on the inspection port 2, and an observation hatch 7 that can be rotated and opened is installed on the observation port 3. The outer wall of the cover body 1 is smooth, and the inner side wall of the cover body 1 is provided with foam reinforcing ribs 8 arranged horizontally and vertically.

[0035] The underwater sand-prevention and sand-accumulation protection cover for large composite materials used in oil and gas equipment provided by this invention features an inspection port 2, an observation port 3, a subsea pipeline outlet 4, a hose outlet 5, and a lifting hole 15 on the cover body 1. The subsea pipeline outlet 4 and the hose outlet 5 are respectively connected to the bottom of the cover body 1. The inspection port 2 is equipped with a rotatable inspection hatch 6, and the observation port 3 is equipped with a rotatable observation hatch 7. The outer wall of the cover body 1 is smooth, and the inner wall of the cover body 1 is provided with horizontal and vertical foam reinforcing ribs 8. This design solves the technical problem of existing composite material protective covers having a simple structure and external rib plate protective covers that are prone to sand accumulation inside the surface rib frame when used on the seabed, resulting in a continuous increase in sand accumulation on the surface of the protective cover. The cover body 1 is made of composite material and does not require anodizing protection. The coordinated design of the inspection port and inspection hatch facilitates entry into the enclosure 1 for maintenance of oil and gas equipment. The coordinated design of the observation port and observation hatch facilitates observation of the interior of the enclosure 1. The subsea pipeline outlet 4 and hose outlet 5 facilitate the laying and extension of subsea pipelines and hoses. At the same time, the design of the built-in reinforcing ribs not only increases the rigidity of the enclosure, but also makes the outer wall of the enclosure 1 smooth, preventing sand and dust from accumulating. The smooth surface allows sand to slide off and be washed away, ensuring that fishing nets and other equipment will not be dragged onto the surface of the enclosure 1 and cause it to be pulled and damaged. The internal rib reinforcement structure simplifies the structural form of the protective enclosure mold, avoids long processing time for the rib grooves, and shortens the preparation time.

[0036] The foam reinforcing ribs of this invention are filled with polyurethane; the foam reinforcing ribs are integrally formed with the cover body 1; the inner ribs are formed with a rigid foam sandwich structure to ensure that the inner and outer covers are completely covered by the composite material layer. The foam reinforcing ribs save fiber usage and reduce the weight of the cover body 1 while meeting the strength requirements, ensuring the stability of the protective cover structure and adapting to the pressure in deep water.

[0037] like Figure 1 , Figure 2 As shown, this embodiment includes two opposing inspection doors 6, each inspection door 6 is provided with at least one grab bar embedding groove 9, the grab bar embedding groove 9 is embedded with an inspection door ROV grab bar 10, and the two ends of the inspection door ROV grab bar 10 are fixedly connected to the inner wall of the grab bar embedding groove 9.

[0038] This invention includes two opposing inspection hatches 6, each with at least one grab bar embedding groove 9. An inspection hatch ROV grab bar 10 is embedded within the grab bar embedding groove 9, with both ends of the ROV grab bar 10 fixedly connected to the inner wall of the grab bar embedding groove 9. The ROV grab bar 10 is embedded within the cover 1, ensuring that fishing nets and other equipment will not be dragged onto the surface of the cover 1, causing it to be pulled and damaged. Simultaneously, it facilitates the grabbing of the inspection hatches 6 underwater, optimizing operation, saving opening time, and reducing costs.

[0039] like Figure 1 , 2 As shown, the inspection hatch 6 in this embodiment is provided with a locking pin insertion groove 11, and a locking pin 12 is embedded in the locking pin insertion groove 11. The locking pin 12 passes through the inspection hatch 6 and is inserted and fixed to the inner wall of the inspection port 2. The locking pin 12 includes a pin rod 121 that passes through the inspection hatch 6, and a handle 122 extending laterally is provided on the side wall of one end of the pin rod 121.

[0040] The present invention features a locking pin insertion groove 11 on the inspection door 6, with a locking pin 12 embedded in the groove 11. The locking pin 12 passes through the inspection door 6 and is inserted and fixed to the inner wall of the inspection port 2. The locking pin 12 includes a pin rod 121 that passes through the inspection door 6. One end of the pin rod 121 has a handle 122 that extends laterally, which facilitates the closing and opening of the inspection door 6, optimizes operation, saves time in opening and closing, and saves costs.

[0041] like Figure 1 , Figure 2 As shown, the enclosure 1 of this embodiment includes a top plate 101, a side plate 102 extending downward around the top plate 101, and a flange 103 extending outward laterally at the bottom of the side plate 102. The included angle between the side plate 102 and the top plate 101 is an obtuse angle. The inspection port 2 is located on the top plate 101, and the observation port 3, the subsea pipeline outlet 4, and the hose outlet 5 are located on the side plate 102. The subsea pipeline outlet 4 and the hose outlet 5 are symmetrically arranged on the left and right.

[0042] The present invention includes a cover 1 comprising a top plate 101, a side plate 102 extending downward around the circumference of the top plate 101, and a flange 103 extending laterally outward at the bottom of the side plate 102. The included angle between the side plate 102 and the top plate 101 is an obtuse angle. An inspection port 2 is located on the top plate 101, and an observation port 3, a subsea pipeline outlet 4, and a hose outlet 5 are located on the side plate 102. The design of the subsea pipeline outlet 4 and the hose outlet 5 being symmetrically arranged on the left and right is simple and reasonable, does not accumulate sand, and is easy to install.

[0043] like Figure 1 As shown, in this embodiment, the edge of the subsea pipeline outlet 4 is provided with an outwardly extending subsea pipeline baffle 13, and the circumference of the hose outlet 5 is provided with an outwardly extending hose baffle 14.

[0044] The present invention features a design with an outwardly extending subsea pipe baffle 13 at the edge of the subsea pipe outlet 4 and an outwardly extending hose baffle 14 around the circumference of the hose outlet 5, which prevents sand accumulation at the subsea pipe outlet 4 and the hose outlet 5.

[0045] like Figure 1 As shown, the front and rear side plates 102 of this embodiment are symmetrically provided with lifting holes 15 to ensure the stability and safety of lifting.

[0046] like Figure 1 , Figure 2 , Figure 5 As shown, the top plate 101 of this embodiment is provided with a guide positioning hole 16, a guide plug 17 is inserted into the guide positioning hole 16, the top of the guide plug 17 is provided with a guide plug groove 171, a guide plug ROV gripper 18 is provided in the guide plug groove 171, and the two ends of the guide plug ROV gripper 18 are fixedly connected to the inside of the guide plug groove 171.

[0047] This invention features a guide positioning hole 16 on the top plate 101, into which a guide plug 17 is inserted. The top of the guide plug 17 has a guide plug groove 171, and a guide plug ROV gripper 18 is located within the guide plug groove 171. Both ends of the guide plug ROV gripper 18 are fixedly connected to the inside of the guide plug groove 171. The guide positioning hole 16 facilitates the installation and fixation of the cover 1, improving installation efficiency and saving costs. The guide plug 17 ensures that quicksand will not enter the protective cover through the guide positioning hole 16, thus preventing interference with the normal operation of the oil and gas equipment. The guide plug ROV gripper 18 facilitates gripping, improving work efficiency.

[0048] like Figure 5 As shown, the guide plug 17 in this embodiment includes a plug section 1701 that passes through the guide positioning hole 16. The top of the plug section 1701 is provided with a stop portion 1702, and the guide plug groove 171 is located on the top of the stop portion 1702. The longitudinal section of the plug section 1701 is an inverted triangle.

[0049] The present invention includes a guide plug 17 comprising an insertion section 1701 that passes through a guide positioning hole 16, and a stop portion 1702 at the top of the insertion section 1701. The guide plug groove 171 is located at the top of the stop portion 1702. The longitudinal section of the insertion section 1701 is an inverted triangular design, which is an inverted conical design, to ensure that quicksand will not enter the interior of the protective cover from the guide positioning hole 16.

[0050] like Figure 4 As shown, the inspection hatch 6 in this embodiment is provided with a door hinge sleeve C21 on one side, and a door hinge B20 is installed inside the door hinge sleeve C21. It also includes two door hinge pin seats A19 located on both sides of the door hinge sleeve C21. The two ends of the door hinge B20 are respectively connected to each door hinge pin seat A19, and each door hinge pin seat A19 is also respectively connected to the inspection hatch 6 and the cover 1.

[0051] The present invention features a door hinge sleeve C21 on one side of the inspection hatch 6, with a door hinge B20 inserted inside the door hinge sleeve C21. It also includes two door hinge pin seats A19 located on both sides of the door hinge sleeve C21. The two ends of the door hinge B20 are respectively connected to each door hinge pin seat A19, and each door hinge pin seat A19 is also respectively connected to the inspection hatch 6 and the cover 1. This design allows for opening within a 180-degree range on one side, greatly satisfying the needs of seabed observation and entry.

[0052] The cover 1 of the present invention has a length of 19.2m and a width of 11.8m; it can protect large oil and gas equipment.

[0053] like Figure 6 As shown, this embodiment provides a protective structure for oil and gas equipment, including an underwater sand-proof large composite material protective cover for oil and gas equipment and a base 22 as described in any of the above-mentioned embodiments. The cover 1 is detachably connected to the base 22 via a detachable connector.

[0054] The present invention provides an oil and gas equipment protection structure, including an underwater sand-proof and large composite material oil and gas equipment protective cover and a base 22 as described above. The cover 1 is designed to be detachably connected to the base 22 through a detachable connector. The oil and gas equipment can be fixed on the base 22, and the cover 1 is placed on the base to achieve protection of the oil and gas equipment.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A protective cover for large-scale composite material oil and gas equipment for underwater sand accumulation prevention, characterized in that: The enclosure (1) is made of composite material. The enclosure (1) is provided with an inspection port (2), an observation port (3), a subsea pipeline outlet (4), a hose outlet (5) and a hoisting hole (15). The subsea pipeline outlet (4) and the hose outlet (5) are respectively connected to the bottom of the enclosure (1). The inspection port (2) is equipped with a rotating inspection hatch (6), and the observation port (3) is equipped with a rotating observation hatch (7). The outer wall of the enclosure (1) is smooth, and the inner wall of the enclosure (1) is provided with horizontal and vertical foam reinforcing ribs (8). It includes two inspection doors (6) that open in opposite directions. Each inspection door (6) is provided with at least one grab bar embedding groove (9). The grab bar embedding groove (9) is provided with an inspection door ROV grab bar (10). The two ends of the inspection door ROV grab bar (10) are fixed to the inner wall of the grab bar embedding groove (9). The inspection hatch (6) is provided with a locking pin insertion groove (11), and a locking pin (12) is embedded in the locking pin insertion groove (11). The locking pin (12) passes through the inspection hatch (6) and is inserted and fixed to the inner wall of the inspection port (2). The locking pin (12) includes a pin rod (121) that passes through the inspection hatch (6), and a handle (122) extending laterally is provided on the side wall of one end of the pin rod (121). The enclosure (1) includes a top plate (101), and the top plate (101) is provided with a downwardly extending side plate (102) around its circumference. The bottom of the side plate (102) is provided with an outwardly extending flange (103). The included angle between the side plate (102) and the top plate (101) is an obtuse angle. The inspection port (2) is located on the top plate (101), and the observation port (3), the subsea pipeline outlet (4), and the hose outlet (5) are located on the side plate (102). The subsea pipeline outlet (4) and the hose outlet (5) are symmetrically arranged on the left and right. The top plate (101) is provided with a guide positioning hole (16), a guide plug (17) is inserted into the guide positioning hole (16), the top of the guide plug (17) is provided with a guide plug groove (171), a guide plug ROV gripper (18) is provided in the guide plug groove (171), and the two ends of the guide plug ROV gripper (18) are fixedly connected to the inside of the guide plug groove (171). The guide plug (17) includes an insertion section (1701) that passes through the guide positioning hole (16), and a stop (1702) is provided at the top of the insertion section (1701). The guide plug groove (171) is located at the top of the stop (1702). The longitudinal section of the insertion section (1701) is an inverted triangle. The inspection hatch (6) is provided with a door hinge sleeve C (21) on one side. A door hinge B (20) is installed inside the door hinge sleeve C (21). It also includes two door hinge pin seats A (19) located on both sides of the door hinge sleeve C (21). The two ends of the door hinge B (20) are connected to each door hinge pin seat A (19) respectively. Each door hinge pin seat A (19) is also connected to the inspection hatch (6) and the cover (1) respectively. The length of the cover (1) is 19.2m and the width is 11.8m; the cover (1) is made of glass fiber and vinyl resin by vacuum injection process.

2. The underwater sand-prevention and sand-accumulation large composite material protective cover for oil and gas equipment according to claim 1, characterized in that: The foam reinforcing rib (8) is filled with polyurethane; the foam reinforcing rib (8) is integrally formed with the cover (1).

3. The underwater sand-prevention and anti-sand accumulation large composite material oil and gas equipment protective cover according to claim 2, characterized in that: The edge of the subsea pipeline outlet (4) is provided with an outwardly extending subsea pipeline baffle (13), and the circumference of the hose outlet (5) is provided with an outwardly extending hose baffle (14).

4. The underwater sand-prevention and anti-sand accumulation large composite material oil and gas equipment protective cover according to claim 3, characterized in that: The front and rear side panels (102) are symmetrically provided with lifting holes (15).

5. A protective structure for oil and gas equipment, characterized in that: The protective cover and base (22) for large composite materials for underwater sand-proofing oil and gas equipment as described in any one of claims 1-4, wherein the cover (1) is detachably connected to the base (22) via a detachable connector.

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