Subsea BOP Pressure Testing Device and Pressure Testing Method

Abstract

The present invention belongs to the technical field of underwater blowout preventer pressure testing, and discloses an underwater blowout preventer pressure testing device and a pressure testing method. The underwater blowout preventer pressure testing device is used for pressure testing an underwater blowout preventer, and the support and binding structure is used for fixedly supporting the underwater blowout preventer; the base is used for supporting on the ground or deck; the driving member includes a fixed member fixedly installed on the base and a telescopic member capable of reciprocatingly telescoping relative to the fixed member; the pressure testing joint assembly is arranged on the telescopic member, and the pressure testing joint assembly is used for sealingly cooperating with the underwater blowout preventer. The pressure testing joint assembly has an injection port for injecting hydraulic oil into the interior of the underwater blowout preventer to perform a pressure testing operation on the underwater blowout preventer. For this underwater blowout preventer pressure testing device, the underwater blowout preventer is supported by the support and binding structure to keep the whole underwater blowout preventer fixed. The driving member only needs to drive the pressure testing joint assembly to move, and then the pressure testing joint assembly can be sealingly cooperated with the underwater blowout preventer, so as to complete the pressure testing operation without driving the whole underwater blowout preventer to move.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater blowout preventer pressure testing, and particularly to an underwater blowout preventer pressure testing device and a pressure testing method. Background Art

[0002] The underwater blowout preventer is used to be arranged on the seabed to control and prevent blowout. Before the underwater blowout preventer is lowered to the seabed wellhead for operation, it needs to be subjected to a pressure test, that is, pressure testing.

[0003] The prior art provides a pressure testing base and a pressure testing system for storing the underwater blowout preventer. It is provided with a pressure testing base for placing the underwater blowout preventer. The pressure testing base is provided with four hydraulically actuated jacks with adjustable heights. A pressure testing pile is arranged below the pressure testing base. When it is necessary to perform a pressure test on the underwater blowout preventer, first hoist the underwater blowout preventer onto the four hydraulically actuated jacks, and adjust the height of the hydraulically actuated jacks so that the underwater blowout preventer reaches a suitable height, and then perform a pressure test on the underwater blowout preventer through the pressure testing pile. However, the problem is that when adjusting the relative height between the pressure testing pile and the underwater blowout preventer, it is necessary to drive the entire underwater blowout preventer to vertically rise and fall, and the weight of the underwater blowout preventer can reach 400 tons, so energy waste will be caused. In addition, during the lifting and lowering process of the underwater blowout preventer, the underwater blowout preventer may also be tilted, and there is a risk of the underwater blowout preventer falling at this time. Summary of the Invention

[0004] According to one aspect of the present invention, the present invention provides an underwater blowout preventer pressure testing device to solve the problems in the prior art that it is necessary to drive the entire underwater blowout preventer to vertically rise and fall, resulting in energy waste and possibly causing the underwater blowout preventer to tilt.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An underwater blowout preventer pressure testing device for supporting an underwater blowout preventer and performing a pressure test; the underwater blowout preventer pressure testing device includes:

[0007] A support and binding structure for fixedly supporting the underwater blowout preventer;

[0008] A base for supporting on the ground or deck;

[0009] A driving member including a fixing member fixedly installed on the base and a telescopic member capable of reciprocatingly telescoping relative to the fixing member;

[0010] A pressure testing joint assembly is arranged on the telescopic member. The pressure testing joint assembly is used for sealing cooperation with the underwater blowout preventer. The pressure testing joint assembly has an injection port for injecting hydraulic oil into the interior of the underwater blowout preventer to perform a pressure test operation on the underwater blowout preventer.

[0011] As a preferred solution for the underwater blowout preventer pressure test device, the pressure test joint assembly is further provided with an injection pipeline for supplying hydraulic oil to the injection port. The pressure test joint assembly has a pressure relief port for discharging hydraulic oil, and a pressure relief pipeline is provided for discharging the hydraulic oil at the pressure relief port.

[0012] As a preferred solution for the underwater blowout preventer pressure test device, the pressure test joint assembly includes a pressure test joint support and a pressure test joint disposed on the pressure test joint support. The pressure test joint support is disposed on the telescopic member, and the pressure test joint is used for sealing cooperation with the underwater blowout preventer; the pressure test joint support is tubular, and an opening is provided on the outer wall of the pressure test joint support. Both the injection pipeline and the pressure relief pipeline extend out from the opening.

[0013] As a preferred solution for the underwater blowout preventer pressure test device, the interior of the underwater blowout preventer is used for installing a pressure test drill pipe. The underwater blowout preventer pressure test device further includes a pressure test drill pipe joint, which is used for connecting with the pressure test drill pipe, and the pressure test drill pipe joint can be in abutting cooperation with the pressure test joint assembly, so as to form a sealed cavity for pressure test among the underwater blowout preventer, the pressure test drill pipe, the pressure test joint assembly and the pressure test drill pipe joint.

[0014] As a preferred solution for the underwater blowout preventer pressure test device, the telescopic member includes a piston capable of reciprocating inside the fixed member, a piston rod fixedly connected to the piston, and a support plate fixedly connected to the piston rod. A tubular steel ring seat is fixedly provided on the support plate, and the bottom of the pressure test joint assembly is disposed inside the steel ring seat.

[0015] As a preferred solution for the underwater blowout preventer pressure test device, there is a gap between the inner wall of the steel ring seat and the outer wall of the pressure test joint assembly.

[0016] As a preferred solution for the underwater blowout preventer pressure test device, the piston is disposed inside the fixed member and divides the interior of the fixed member into a rodless cavity and a rod cavity. The piston rod is located in the rod cavity. The driving member further includes a first connection pipeline for hydraulic oil to enter and exit the rodless cavity and a second connection pipeline for hydraulic oil to enter and exit the rod cavity.

[0017] As a preferred solution for the underwater blowout preventer pressure test device, the base includes a support steel pipe for supporting on the ground or deck and a base panel disposed on the support steel pipe. The fixed member is connected with a connecting plate, and the connecting plate is fixedly connected to the base panel.

[0018] As a preferred solution of the underwater blowout preventer pressure test device, the support plate is provided with an extension rod, the extension rod extends along the telescopic direction of the telescopic member, the connecting plate is provided with a first through hole, the base panel is provided with a second through hole, and the extension rod slidably passes through the first through hole and the second through hole.

[0019] According to another aspect of the present invention, there is provided an underwater blowout preventer pressure test method, which is implemented by the above-mentioned underwater blowout preventer pressure test device. The underwater blowout preventer pressure test method includes:

[0020] S100: Hoist the underwater blowout preventer to the support and binding structure, and drive the pressure test joint assembly to lift and lower through the driving member, so that the pressure test joint assembly is in sealing cooperation with the underwater blowout preventer;

[0021] S200: Conduct a low-pressure test; the low-pressure test includes: injecting hydraulic oil into the interior of the underwater blowout preventer, and the oil pressure inside the underwater blowout preventer is a first oil pressure, and maintaining the pressure for a first preset time;

[0022] S300: Determine whether there is a leak;

[0023] If there is no leak, then execute step S400;

[0024] S400: Conduct a high-pressure test; the high-pressure test includes: injecting hydraulic oil into the interior of the underwater blowout preventer, and the oil pressure inside the underwater blowout preventer is a second oil pressure, the second oil pressure is greater than the first oil pressure, and maintaining the pressure for a second preset time;

[0025] S500: Determine again whether there is a leak;

[0026] If there is no leak, then determine that the underwater blowout preventer has no leak, and execute step S600;

[0027] S600: Drain the hydraulic oil inside the underwater blowout preventer.

[0028] The beneficial effects of the present invention are:

[0029] The present invention provides a pressure testing device for a subsea blowout preventer, which is used to support the subsea blowout preventer and conduct pressure testing. The pressure testing device for the subsea blowout preventer includes a support and lashing structure, a base, a driving member, and a pressure testing joint assembly. The support and lashing structure is used to fixedly support the subsea blowout preventer; the base is used to support on the ground or deck; the driving member includes a fixed member fixedly installed on the base and a telescopic member capable of reciprocatingly telescoping relative to the fixed member; the pressure testing joint assembly is disposed on the telescopic member, and the pressure testing joint assembly is used for sealing cooperation with the subsea blowout preventer. The pressure testing joint assembly has an injection port for injecting hydraulic oil into the interior of the subsea blowout preventer to conduct pressure testing operations on the subsea blowout preventer. For the above-mentioned pressure testing device for the subsea blowout preventer, the subsea blowout preventer is supported by the support and lashing structure to keep the whole subsea blowout preventer fixed. The driving member only needs to drive the pressure testing joint assembly to move, and the pressure testing joint assembly can be sealed and cooperated with the subsea blowout preventer, so as to complete the pressure testing operation without driving the whole subsea blowout preventer to move. In addition, the pressure testing device for the subsea blowout preventer can also provide support for the subsea blowout preventer when the subsea blowout preventer does not need to be pressure tested, so as to temporarily store the subsea blowout preventer; or, the pressure testing device for the subsea blowout preventer provides support for the subsea blowout preventer and conducts pressure testing operations at the same time.

[0030] The present invention also provides a pressure testing method for a subsea blowout preventer, which is implemented by the above-mentioned pressure testing device for the subsea blowout preventer. In the pressure testing method for the subsea blowout preventer, the subsea blowout preventer is hoisted to the support and lashing structure, and the driving member drives the pressure testing joint assembly to move up and down so that the pressure testing joint assembly is sealed and cooperated with the subsea blowout preventer; the subsea blowout preventer is supported by the support and lashing structure to keep the whole subsea blowout preventer fixed. The driving member only needs to drive the pressure testing joint assembly to move, and the pressure testing joint assembly can be sealed and cooperated with the subsea blowout preventer, so as to complete the pressure testing operation without driving the whole subsea blowout preventer to move. Then, a low-pressure test is first carried out; the low-pressure test includes: injecting hydraulic oil into the interior of the subsea blowout preventer, and the oil pressure inside the subsea blowout preventer is the first oil pressure, and maintaining the pressure for the first preset time; then it is judged whether there is leakage; if there is no leakage, a high-pressure test is carried out; the high-pressure test includes: injecting hydraulic oil into the interior of the subsea blowout preventer, and the oil pressure inside the subsea blowout preventer is the second oil pressure, the second oil pressure is greater than the first oil pressure, and maintaining the pressure for the second preset time; then it is judged again whether there is leakage; if there is no leakage, it is determined that the subsea blowout preventer has no leakage, and the hydraulic oil inside the subsea blowout preventer is discharged. Through the above-mentioned pressure testing method for the subsea blowout preventer, a low-pressure test can be carried out first, and then a high-pressure test can be carried out to judge the sealing condition of the subsea blowout preventer. If there is no leakage in both tests, it can be determined that the subsea blowout preventer has no leakage. Description of the Drawings

[0031] Figure 1 is the first structural schematic diagram of the pressure testing device for the subsea blowout preventer in the embodiment of the present invention;

[0032] Figure 2It is the second structural schematic diagram of the underwater blowout preventer pressure test device in the embodiment of the present invention;

[0033] Figure 3 It is the structural schematic diagram of the fixing member in the embodiment of the present invention;

[0034] Figure 4 It is the first structural schematic diagram of the telescopic member in the embodiment of the present invention;

[0035] Figure 5 It is the second structural schematic diagram of the telescopic member in the embodiment of the present invention;

[0036] Figure 6 It is the structural schematic diagram of the pressure test joint assembly and the pressure test drill pipe joint in the embodiment of the present invention;

[0037] Figure 7 It is the structural schematic diagram of the base in the embodiment of the present invention;

[0038] Figure 8 It is the flow chart of the underwater blowout preventer pressure test method in the embodiment of the present invention.

[0039] In the figure:

[0040] 100, underwater blowout preventer; 200, binding device; 300, underwater blowout preventer base;

[0041] 1, base; 11, support steel pipe; 12, base panel; 121, second through hole; 13, upper reinforcing gusset; 14, lower reinforcing gusset;

[0042] 2, driving member; 21, fixing member; 22, telescopic member; 221, piston; 222, piston rod; 223, support plate; 224, steel ring seat; 2241, notch; 225, reinforcing rib; 23, first connecting pipeline; 24, second connecting pipeline; 25, connecting plate; 251, first through hole; 26, extension rod;

[0043] 3, pressure test joint assembly; 301, pressure relief port; 302, pressure relief pipeline; 303, injection port; 304, injection pipeline; 31, pressure test joint support; 311, opening; 32, pressure test joint; 321, pressure relief cavity; 322, hydraulic input cavity;

[0044] 4, pressure test drill pipe joint; 401, hollow pipeline. Detailed implementation manners

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, not all structures.

[0046] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under the bottom" of the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0048] In the description of this embodiment, the orientation or positional relationship such as "above", "below", "left", and "right" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0049] The subsea blowout preventer is used to be installed on the seabed to control and prevent blowouts. Before the subsea blowout preventer is lowered to the seabed wellhead for operation, a pressure test, that is, a pressure check, needs to be carried out. The prior art provides a storage and pressure test base and a pressure test system for the subsea blowout preventer, which is provided with a pressure test base for placing the subsea blowout preventer. The pressure test base is provided with four hydraulically actuated lifting posts with adjustable heights. A pressure test pile is arranged below the pressure test base. When it is necessary to conduct a pressure test on the subsea blowout preventer, first lift and install the subsea blowout preventer onto the four hydraulically actuated lifting posts, and adjust the heights of the hydraulically actuated lifting posts to make the subsea blowout preventer reach a suitable height, and then conduct a pressure test on the subsea blowout preventer through the pressure test pile. However, the problem is that when adjusting the relative height between the pressure test pile and the subsea blowout preventer, it is necessary to drive the entire subsea blowout preventer to vertically lift and lower, and the weight of the subsea blowout preventer can reach 400 tons, which will cause waste of energy. In addition, during the lifting and lowering process of the subsea blowout preventer, the subsea blowout preventer may also be tilted, and there is a risk of the subsea blowout preventer falling at this time.

[0050] Refer toFigure 1 and Figures 3 - 7 , the underwater blowout preventer pressure test device is used to support the underwater blowout preventer 100 and conduct a pressure test. The underwater blowout preventer pressure test device includes a support and lashing structure, a base 1, a driving member 2, and a pressure test joint assembly 3. The support and lashing structure is used to fixedly support the underwater blowout preventer 100. In this embodiment, the support and lashing structure includes an underwater blowout preventer base 300 for supporting on the ground or deck, and further includes a lashing device 200. The underwater blowout preventer base 300 is used to support the underwater blowout preventer 100 so that the underwater blowout preventer 100 is kept fixed as a whole. The lashing device 200 is used to lash the underwater blowout preventer 100 along the side wall to prevent the underwater blowout preventer 100 from tilting, and it can be tightened and limited. The base 1 is used to support on the ground or deck; the driving member 2 includes a fixing member 21 fixedly installed on the base 1 and a telescopic member 22 that can reciprocally expand and contract relative to the fixing member 21; the pressure test joint assembly 3 is arranged on the telescopic member 22. The pressure test joint assembly 3 is used for sealing cooperation with the underwater blowout preventer 100. The pressure test joint assembly 3 has an injection port 303 for injecting hydraulic oil into the interior of the underwater blowout preventer 100 to conduct a pressure test operation on the underwater blowout preventer 100. For the above underwater blowout preventer pressure test device, the underwater blowout preventer 100 is supported by the support and lashing structure so that the underwater blowout preventer 100 is kept fixed as a whole. The driving member 2 only needs to drive the pressure test joint assembly 3 to move, and then the pressure test joint assembly 3 can be hermetically fitted with the underwater blowout preventer 100, thereby completing the pressure test operation without driving the entire underwater blowout preventer 100 to move. In this embodiment, in order to prevent the position of the underwater blowout preventer 100 from tilting during the pressure test, the pressure test operation should be selected on the deck of a stable ship or offshore structure, or on a horizontal ground. At this time, the telescopic member 22 reciprocally expands and contracts in the vertical direction relative to the fixing member 21.

[0051] As an alternative solution, the underwater blowout preventer base 300 can also be omitted. The support and lashing structure only includes the lashing device 200. The underwater blowout preventer 100 is lashed by the lashing device 200 to prevent the underwater blowout preventer 100 from tilting, and the underwater blowout preventer 100 is directly supported on the pressure test joint assembly 3, and then the support is provided by the base 1. In addition, in this solution, while the underwater blowout preventer pressure test device provides support for the underwater blowout preventer 100, the pressure test operation can also be carried out synchronously.

[0052] In addition, the underwater blowout preventer pressure test device provided in this embodiment can also provide support for the underwater blowout preventer 100 when the underwater blowout preventer 100 does not need to be pressure tested, so as to temporarily store the underwater blowout preventer 100.

[0053] Continue to refer to Figures 1 - 7, the pressure test joint assembly 3 is further provided with an injection pipeline 304 for supplying hydraulic oil to the injection port 303. The pressure test joint assembly 3 has a pressure relief port 301 for discharging the hydraulic oil, and a pressure relief pipeline 302 is provided for discharging the hydraulic oil at the pressure relief port 301. Thus, the hydraulic oil can be discharged through the pressure relief pipeline 302, and the hydraulic oil to be injected can be injected into the sealing cavity sequentially through the injection port 303 and the injection pipeline 304. Optionally, the on / off of both the injection pipeline 304 and the pressure relief pipeline 302 is controlled by corresponding control valves.

[0054] Continue to refer to Figures 1 - 7 , the pressure test joint assembly 3 includes a pressure test joint support 31 and a pressure test joint 32 disposed on the pressure test joint support 31. The pressure test joint support 31 is disposed on the telescopic member 22, and the pressure test joint 32 is used for sealing cooperation with the subsea blowout preventer 100; the pressure test joint support 31 is tubular, and an opening 311 is formed on the outer wall of the pressure test joint support 31. Both the injection pipeline 304 and the pressure relief pipeline 302 extend out from the opening 311. Optionally, the pressure test joint 32 is further provided with a hydraulic input cavity 322 and a pressure relief cavity 321. The injection pipeline 304 is communicated with the injection port 303 through the hydraulic input cavity 322, and the pressure relief port 301 is communicated with the pressure relief pipeline 302 through the pressure relief cavity 321.

[0055] Continue to refer to Figures 1 - 7 , the inside of the subsea blowout preventer 100 is used for installing a pressure test drill pipe. The pressure test drill pipe is used to replace and simulate the oil pipe in the oil production well and is disposed inside the subsea blowout preventer 100 for pressure test operations. The ram of the subsea blowout preventer 100 can be in sealing contact with the outer wall of the pressure test drill pipe. The subsea blowout preventer pressure test device further includes a pressure test drill pipe joint 4. The pressure test drill pipe joint 4 is used for connecting with the pressure test drill pipe, and the pressure test drill pipe joint 4 and the pressure test joint assembly 3 can be in abutting cooperation to form a sealing cavity for pressure test between the subsea blowout preventer 100, the pressure test drill pipe, the pressure test joint assembly 3 and the pressure test drill pipe joint 4. In addition, in this embodiment, a hollow pipeline 401 is disposed inside the pressure test drill pipe joint 4. The pressure test drill pipe is a hollow drill pipe and has an inner cavity. The hollow pipeline 401 is communicated with the pressure relief port 301. The pressure test drill pipe joint 4 is used for connecting with the pressure test drill pipe to communicate the hollow pipeline 401 with the inner cavity of the pressure test drill pipe and form a sealing cavity between the pressure test joint 32, the pressure test drill pipe joint 4, the pressure test drill pipe and the subsea blowout preventer 100. It can be understood that, in order to ensure the sealing effect, a sealing steel ring should also be disposed between the pressure test joint 32 and the subsea blowout preventer 100. Thus, when performing the pressure test, the pressure test drill pipe joint 4 can be installed on the pressure test drill pipe, and then the subsea blowout preventer 100 and the pressure test drill pipe are driven by the lifting structure to complete the assembly of the pressure test drill pipe joint 4 and the pressure test joint assembly 3. Optionally, one end of the pressure test joint 32 close to the pressure test drill pipe joint 4 has a groove, and the pressure test drill pipe joint 4 can be inserted into the groove and abutted against the groove wall to complete the assembly.

[0056] Continue to refer to Figures 1 - 7 , the telescopic member 22 includes a piston 221 capable of reciprocating inside the fixed member 21, a piston rod 222 fixedly connected to the piston 221, and a support plate 223 fixedly connected to the piston rod 222. A tubular steel ring seat 224 is fixedly arranged on the support plate 223. The bottom of the pressure test joint assembly 3 is arranged in the steel ring seat 224, specifically, the bottom of the pressure test joint support 31 is arranged in the steel ring seat 224. Optionally, the support plate 223 and the steel ring seat 224 are both fixedly connected with a reinforcing rib 225 to increase the connection structure strength between the two. Optionally, a notch 2241 is arranged on the side wall of the steel ring seat 224, and the notch 2241 is aligned with the opening 311. The injection pipeline 304 and the pressure relief pipeline 302 can sequentially pass through the opening 311 and the notch 2241.

[0057] Continue to refer to Figures 1 - 7 , there is a gap between the inner wall of the steel ring seat 224 and the outer wall of the pressure test joint assembly 3, so as to allow a certain displacement of the pressure test joint assembly 3 relative to the steel ring seat 224, which can be used to finely adjust the position of the pressure test joint assembly 3 relative to the steel ring seat 224.

[0058] Continue to refer to Figures 1 - 7 , the piston 221 is arranged inside the fixed member 21 and divides the inside of the fixed member 21 into a rodless chamber and a rod chamber. The piston rod 222 is located in the rod chamber. The driving member 2 further includes a first connecting pipeline 23 for hydraulic oil to enter and exit the rodless chamber and a second connecting pipeline 24 for hydraulic oil to enter and exit the rod chamber. By controlling the hydraulic oil to enter and exit the rodless chamber and the rod chamber through the two connecting pipelines, the amount of hydraulic oil in the rodless chamber and the rod chamber can be controlled, and then the telescopic member 22 can be driven by the hydraulic oil. Optionally, both the first connecting pipeline 23 and the second connecting pipeline 24 are controlled to be opened and closed by corresponding control valves.

[0059] Continue to refer to Figures 1 - 7, the base 1 includes a support steel pipe 11 for supporting on the ground or deck and a base panel 12 provided on the support steel pipe 11. The fixing member 21 is connected with a connecting plate 25, and the connecting plate 25 is fixedly connected with the base panel 12, specifically, it can be fixedly connected by bolts. Optionally, an upper reinforcing gusset 13 is fixedly provided on the inner wall of the support steel pipe 11, and the upper reinforcing gusset 13 is fixedly connected with the base panel 12, thereby enhancing the connection structure strength between the support steel pipe 11 and the base panel 12; a lower reinforcing gusset 14 is fixedly provided on the outer wall of the support steel pipe 11, and the lower reinforcing gusset 14 is fixedly connected with the ground or deck, thereby enhancing the connection structure strength between the support steel pipe 11 and the ground or deck. In other embodiments, the upper reinforcing gusset 13 can also be provided on the outer wall of the support steel pipe 11, the lower reinforcing gusset 14 can be provided on the inner wall of the support steel pipe 11, or both are provided on the outer wall of the support steel pipe 11 at the same time, or both are provided on the inner wall of the support steel pipe 11 at the same time.

[0060] Continue to refer to Figures 1 - 7 , the support plate 223 is provided with an extension rod 26, the extension rod 26 extends along the telescopic direction of the telescopic member 22, the connecting plate 25 is provided with a first through hole 251, the base panel 12 is provided with a second through hole 121, and the extension rod 26 slidably passes through the first through hole 251 and the second through hole 121. The movement of the extension rod 26 can be guided and limited by the first through hole 251 and the second through hole 121, so as to guide and limit the position of the support plate 223 and prevent it from tilting. Optionally, the extension rod 26 and the support plate 223 can be connected by structures such as bolts.

[0061] Refer to Figure 8 , this embodiment also provides a method for testing the underwater blowout preventer. It is implemented by the above-mentioned underwater blowout preventer testing device, and the method for testing the underwater blowout preventer includes the following steps.

[0062] S100: Lift the underwater blowout preventer 100 to the support and lashing structure, and drive the pressure test joint assembly 3 to lift and lower through the driving member 2, so that the pressure test joint assembly 3 is in sealing fit with the underwater blowout preventer 100.

[0063] Support the underwater blowout preventer 100 through the support and lashing structure to keep the whole underwater blowout preventer 100 fixed. The driving member 2 only needs to drive the movement of the pressure test joint assembly 3 to make the pressure test joint assembly 3 in sealing fit with the underwater blowout preventer 100, thereby completing the pressure test operation without driving the whole underwater blowout preventer 100 to move.

[0064] Optionally, before hoisting the subsea blowout preventer 100 onto the support and lashing structure, it should be confirmed that the sealing steel ring has been installed on the pressure test joint assembly 3. During the operation, generally, first hoist the subsea blowout preventer 100 onto the pressure test joint assembly 3, and compress the sealing steel ring, then hoist the pressure test drill pipe and the pressure test drill pipe joint 4 into the subsea blowout preventer 100. Or, first hoist the pressure test drill pipe and the pressure test drill pipe joint 4 onto the pressure test joint assembly 3, and then lower the subsea blowout preventer 100 along the pressure test drill pipe onto the pressure test joint assembly 3, but the operation difficulty of this scheme is relatively large.

[0065] It can be understood that since there is a gap between the inner wall of the steel ring seat 224 and the outer wall of the pressure test joint assembly 3, allowing a certain displacement of the pressure test joint assembly 3 relative to the steel ring seat 224. During this process, the position of the pressure test joint assembly 3 relative to the steel ring seat 224 can be finely adjusted to enable the smooth assembly between the pressure test joint assembly 3 and the pressure test drill pipe joint 4.

[0066] S200: Conduct a low-pressure test; Conducting a low-pressure test includes: injecting hydraulic oil into the interior of the subsea blowout preventer 100, and the oil pressure inside the subsea blowout preventer 100 is the first oil pressure, and maintaining the pressure for the first preset time.

[0067] In this embodiment, the first preset time is specifically 5 minutes, and in other embodiments, the first preset time can also be set to other times as needed, such as 3 minutes, 4 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, or 10 minutes, etc.

[0068] S300: Determine whether leakage occurs.

[0069] Specifically, it can be determined whether leakage occurs by detecting the oil pressure difference inside the subsea blowout preventer 100 before and after the test. If the oil pressure difference inside the subsea blowout preventer 100 is higher than the preset value, it is determined that leakage has occurred. If the oil pressure difference inside the subsea blowout preventer 100 is not higher than the preset value, it is determined that no leakage has occurred.

[0070] If no leakage occurs, then execute step S400 to continue with the next test.

[0071] Optionally, if leakage occurs, stop the test and repair the subsea blowout preventer 100.

[0072] S400: Conduct a high-pressure test; Conducting a high-pressure test includes: injecting hydraulic oil into the interior of the subsea blowout preventer 100, and the oil pressure inside the subsea blowout preventer 100 is the second oil pressure, the second oil pressure is greater than the first oil pressure, and maintaining the pressure for the second preset time.

[0073] Generally speaking, the high-pressure test is the main process for the pressure test of the subsea blowout preventer, and the required pressure holding time is relatively long. Therefore, the second preset time should be longer than the first preset time.

[0074] In this embodiment, the second preset time is specifically 15 minutes. In other embodiments, the second preset time can also be set to other times as needed, such as 11 minutes, 12 minutes, 13 minutes, 14 minutes, 16 minutes, 17 minutes, 18 minutes, 19 minutes, or 20 minutes, etc.

[0075] In addition, to ensure the effect of the pressure test, the second hydraulic pressure should be set to be greater than the working hydraulic fluid of the subsea blowout preventer 100.

[0076] S500: Determine again whether leakage occurs.

[0077] Specifically, it is also possible to determine whether leakage occurs by detecting the oil pressure difference inside the subsea blowout preventer 100 before and after the test. If the oil pressure difference inside the subsea blowout preventer 100 is higher than the preset value, it is determined that leakage has occurred. If the oil pressure difference inside the subsea blowout preventer 100 is not higher than the preset value, it is determined that no leakage has occurred.

[0078] If no leakage occurs, it is determined that the subsea blowout preventer 100 has not leaked, and step S600 is executed.

[0079] Optionally, if leakage occurs, stop the test and repair the subsea blowout preventer 100.

[0080] S600: Drain the hydraulic oil inside the subsea blowout preventer 100.

[0081] Through the above subsea blowout preventer pressure test method, a low-pressure test can be carried out first, and then a high-pressure test can be carried out to judge the sealing condition of the subsea blowout preventer 100. If no leakage occurs in both tests, it can be determined that the subsea blowout preventer 100 has not leaked. At this time, the hydraulic oil inside the subsea blowout preventer 100 can be drained to complete the pressure test operation.

[0082] Optionally, after draining the hydraulic oil inside the subsea blowout preventer 100, drive the subsea blowout preventer 100 and the pressure test drill pipe to move to other positions by means of hoisting, etc. Subsequently, the pressure test drill pipe joint 4 can be removed from the pressure test drill pipe.

[0083] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Subsea blowout preventer pressure testing device, characterized in that, The underwater blowout preventer pressure test device is used to support the underwater blowout preventer (100) and perform a pressure test; The underwater blowout preventer pressure test device includes: A support and binding structure for fixedly supporting the underwater blowout preventer (100); A base (1) for supporting on the ground or deck; A driving member (2), including a fixing member (21) fixedly installed on the base (1) and a telescopic member (22) capable of reciprocatingly telescoping relative to the fixing member (21); A pressure test joint assembly (3) provided on the telescopic member (22), the pressure test joint assembly (3) being used for sealing cooperation with the underwater blowout preventer (100), the pressure test joint assembly (3) having an injection port (303) for injecting hydraulic oil into the interior of the underwater blowout preventer (100) to perform a pressure test operation on the underwater blowout preventer (100); In the underwater blowout preventer pressure test device, the pressure test joint assembly (3) is further provided with an injection pipeline (304) for supplying hydraulic oil to the injection port (303), the pressure test joint assembly (3) having a pressure relief port (301) for discharging hydraulic oil, and a pressure relief pipeline (302) for discharging the hydraulic oil at the pressure relief port (301); In the underwater blowout preventer pressure test device, the pressure test joint assembly (3) includes a pressure test joint support member (31) and a pressure test joint (32) provided on the pressure test joint support member (31), the pressure test joint support member (31) being provided on the telescopic member (22), the pressure test joint (32) being used for sealing cooperation with the underwater blowout preventer (100); the pressure test joint support member (31) is tubular, and an opening (311) is formed on the outer wall of the pressure test joint support member (31), and both the injection pipeline (304) and the pressure relief pipeline (302) extend out from the opening (311); In the underwater blowout preventer pressure test device, a pressure test drill pipe is installed inside the underwater blowout preventer (100), and the underwater blowout preventer pressure test device further includes a pressure test drill pipe joint (4), the pressure test drill pipe joint (4) being used for connecting with the pressure test drill pipe, and the pressure test drill pipe joint (4) and the pressure test joint assembly (3) being capable of abutting and cooperating so as to form a sealed cavity for pressure test among the underwater blowout preventer (100), the pressure test drill pipe, the pressure test joint assembly (3) and the pressure test drill pipe joint (4); One end of the pressure test joint (32) close to the pressure test drill pipe joint (4) has a groove, and the pressure test drill pipe joint (4) can be inserted into the groove and abut against the groove wall; In the underwater blowout preventer pressure test device, the telescopic member (22) includes a piston (221) capable of reciprocating inside the fixing member (21), a piston rod (222) fixedly connected to the piston (221), and a support plate (223) fixedly connected to the piston rod (222), a tubular steel ring seat (224) is fixedly arranged on the support plate (223), and the bottom of the pressure test joint assembly (3) is arranged inside the steel ring seat (224); In the underwater blowout preventer pressure test device, there is a gap between the inner wall of the steel ring seat (224) and the outer wall of the pressure test joint assembly (3).

2. The underwater blowout preventer pressure test device according to claim 1, wherein In the underwater blowout preventer pressure test device, the piston (221) is arranged inside the fixing member (21) and divides the interior of the fixing member (21) into a rodless chamber and a rod chamber. The piston rod (222) is located in the rod chamber. The driving member (2) further includes a first connecting pipeline (23) for hydraulic oil to enter and exit the rodless chamber and a second connecting pipeline (24) for hydraulic oil to enter and exit the rod chamber.

3. The underwater blowout preventer pressure test device according to claim 1, characterized in that, In the underwater blowout preventer pressure test device, the base (1) includes a support steel pipe (11) for supporting on the ground or deck and a base panel (12) arranged on the support steel pipe (11). The fixing member (21) is connected with a connecting plate (25), and the connecting plate (25) is fixedly connected with the base panel (12).

4. The underwater blowout preventer pressure testing device according to claim 3, characterized in that, In the underwater blowout preventer pressure test device, the support plate (223) is provided with an extension rod (26). The extension rod (26) extends along the telescopic direction of the telescopic member (22). The connecting plate (25) is provided with a first through hole (251), and the base panel (12) is provided with a second through hole (121). The extension rod (26) slidably penetrates through the first through hole (251) and the second through hole (121).

5. Method for pressure testing of subsea blowout preventer, characterized in that, Implemented by the underwater blowout preventer pressure test device according to any one of claims 1-4; The underwater blowout preventer pressure test method includes: S100: Lift the underwater blowout preventer (100) to the support and lashing structure. Drive the pressure test joint assembly (3) to lift and lower through the driving member (2), and adjust the position of the pressure test joint assembly (3) relative to the steel ring seat (224) so that the pressure test joint assembly (3) is in sealing fit with the underwater blowout preventer (100). S200: Conduct a low-pressure test; Conducting a low-pressure test includes: injecting hydraulic oil into the interior of the underwater blowout preventer (100), and the oil pressure inside the underwater blowout preventer (100) is the first oil pressure, and maintaining the pressure for a first preset time. S300: Determine whether leakage occurs. If no leakage occurs, then execute step S400; S400: Conduct a high-pressure test; Conducting a high-pressure test includes: injecting hydraulic oil into the interior of the underwater blowout preventer (100), and the oil pressure inside the underwater blowout preventer (100) is the second oil pressure, and the second oil pressure is greater than the first oil pressure, and maintaining the pressure for a second preset time. S500: Determine again whether leakage occurs. If no leakage occurs, then determine that the underwater blowout preventer (100) has no leakage, and execute step S600; S600: Drain the hydraulic oil inside the underwater blowout preventer (100).

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