Underwater blowout preventer pressure test device and pressure test method

Abstract

The invention belongs to the technical field of underwater blowout preventer pressure testing, and discloses an underwater blowout preventer pressure testing device and method, the underwater blowout preventer pressure testing device is used for performing pressure testing on an underwater blowout preventer, and a supporting and binding structure is used for fixing and supporting the underwater blowout preventer; the base is supported on the ground or a deck; the driving piece comprises a fixed piece fixedly installed on the base and a telescopic piece capable of stretching and retracting in a reciprocating mode relative to the fixed piece. The pressure test connector assembly is arranged on the telescopic part, the pressure test connector assembly is used for being matched with the underwater blowout preventer in a sealed mode, the pressure test connector assembly is provided with an injection opening used for injecting hydraulic oil into the underwater blowout preventer so as to conduct pressure test operation on the underwater blowout preventer, and the underwater blowout preventer is supported through the supporting and binding structure; the underwater blowout preventer is integrally kept fixed, the driving piece only needs to drive the pressure test connector assembly to move, the pressure test connector assembly and the underwater blowout preventer can be matched in a sealed mode, and therefore pressure test operation is completed, and the whole underwater blowout preventer does not need to be driven to move.

Description

Technical Field

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

[0002] Underwater BOPs are used to control and prevent blowouts on the seafloor. Before the underwater BOPs are lowered to the seafloor wellhead for operation, pressure testing is required.

[0003] The prior art provides a pressure test base and pressure test system for storing underwater blowout preventers, which is provided with a pressure test base for placing underwater blowout preventers, and the pressure test base is provided with four hydraulic cylinder top rods with adjustable heights, and pressure test piles are provided below the pressure test base. When it is necessary to pressure test the underwater blowout preventer, the underwater blowout preventer is first hoisted onto the four hydraulic cylinder top rods, and the height of the hydraulic cylinder top rods is adjusted so that the underwater blowout preventer reaches a suitable height, and then the underwater blowout preventer is pressure tested through the pressure test piles. However, the problem is that when adjusting the relative height between the pressure test piles and the underwater blowout preventer, the entire underwater blowout preventer needs to be driven to rise and fall vertically, and the weight of the underwater blowout preventer can reach 400 tons, which will lead to a waste of energy. 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. 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 problem that the prior art needs to drive the entire underwater blowout preventer to rise and fall vertically, which will lead to energy waste and may cause the underwater blowout preventer to tilt.

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

[0006] The underwater blowout preventer pressure test device is used to support the underwater blowout preventer and perform pressure test; the underwater blowout preventer pressure test device includes:

[0007] A supporting lashing structure, used for fixing and supporting the underwater blowout preventer;

[0008] a base, for support on the ground or deck;

[0009] A driving member, comprising a fixing member fixedly mounted on the base and a telescopic member capable of reciprocating and telescoping relative to the fixing member;

[0010] A pressure test joint assembly is arranged on the telescopic member, the pressure test joint assembly is used to seal with the underwater blowout preventer, and the pressure test 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 also provided with an injection pipeline for providing hydraulic oil to the injection port, the pressure test joint assembly has a pressure relief port for discharging the hydraulic oil, and is provided with a pressure relief pipeline for discharging the hydraulic oil from 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 arranged on the pressure test joint support, the pressure test joint support is arranged on the telescopic member, and the pressure test joint is used to seal with the underwater blowout preventer; the pressure test joint support is tubular, and an opening is formed on the outer wall of the pressure test joint support, and the injection pipeline and the pressure relief pipeline both extend from the opening.

[0013] As a preferred solution for the underwater blowout preventer pressure testing device, the interior of the underwater blowout preventer is used to install a pressure testing drill pipe, and the underwater blowout preventer pressure testing device also includes a pressure testing drill pipe joint, which is used to connect with the pressure testing drill pipe, and the pressure testing drill pipe joint and the pressure testing joint assembly can abut and cooperate with each other to form a sealed chamber for pressure testing between the underwater blowout preventer, the pressure testing drill pipe, the pressure testing joint assembly and the pressure testing 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 relative to the inside of the fixed member, a piston rod fixedly connected to the piston, and a support plate fixedly connected to the piston rod, the support plate is fixedly provided with a tubular steel ring seat, and the bottom of the pressure test joint assembly is arranged in the steel ring seat.

[0015] As a preferred solution of 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 testing device, the piston is arranged inside the fixing member and divides the interior of the fixing member into a rodless chamber and a rod chamber, the piston rod is located in the rod chamber, and the driving member also includes a first connecting pipeline for hydraulic oil to enter and exit the rodless chamber and a second connecting pipeline for hydraulic oil to enter and exit the rod chamber.

[0017] As a preferred solution for the underwater blowout preventer pressure testing device, the base includes a supporting steel pipe for supporting on the ground or deck and a base panel arranged on the supporting steel pipe, and the fixing member is connected to 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 testing device, the support plate is provided with an extension rod, the extension rod extends along the extension 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 is slidably penetrated 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 testing method, which is implemented by the above-mentioned underwater blowout preventer pressure testing device, and the underwater blowout preventer pressure testing method comprises:

[0020] S100: hoisting the underwater blowout preventer to the supporting binding structure, and driving the pressure test joint assembly to rise and fall by the driving member, so that the pressure test joint assembly and the underwater blowout preventer are sealed and matched;

[0021] S200: performing a low pressure test; the low pressure test comprises: injecting hydraulic oil into the interior of the underwater blowout preventer, wherein the oil pressure inside the underwater blowout preventer is a first oil pressure, and the pressure is maintained for a first preset time;

[0022] S300: Determine whether leakage occurs;

[0023] If no leakage occurs, execute step S400;

[0024] S400: performing a high pressure test; performing 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 the pressure is maintained for a second preset time;

[0025] S500: determining again whether leakage occurs;

[0026] If no leakage occurs, it is determined that the underwater blowout preventer does not leak, and step S600 is executed;

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

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

[0029] The present invention provides an underwater blowout preventer pressure test device, which is used to support an underwater blowout preventer and perform pressure test. The underwater blowout preventer pressure test device includes a support binding structure, a base, a driving member and a pressure test joint assembly. The support binding structure is used to fix and support the underwater blowout preventer; the base is used to support on the ground or the deck; the driving member includes a fixing member fixedly mounted on the base and a telescopic member that can reciprocate and retract relative to the fixing member; the pressure test joint assembly is arranged on the telescopic member, the pressure test joint assembly is used to seal with the underwater blowout preventer, and the pressure test joint assembly has an injection port for injecting hydraulic oil into the interior of the underwater blowout preventer to perform pressure test operation on the underwater blowout preventer. The above-mentioned underwater blowout preventer pressure test device supports the underwater blowout preventer through the support binding structure, so that the underwater blowout preventer remains fixed as a whole. The driving member only needs to drive the pressure test joint assembly to move, so that the pressure test joint assembly can be sealed with the underwater blowout preventer, thereby completing the pressure test operation, without driving the entire underwater blowout preventer to move. In addition, the underwater blowout preventer pressure testing device can also provide support for the underwater blowout preventer when there is no need to perform pressure testing on the underwater blowout preventer, so as to temporarily store the underwater blowout preventer; or, the underwater blowout preventer pressure testing device can provide support for the underwater blowout preventer and perform pressure testing operations at the same time.

[0030] The present invention also provides an underwater blowout preventer pressure testing method, which is implemented by the underwater blowout preventer pressure testing device. In the underwater blowout preventer pressure testing method, the underwater blowout preventer is hoisted to the supporting and binding structure, and the pressure testing joint assembly is driven to rise and fall by the driving member, so that the pressure testing joint assembly and the underwater blowout preventer are sealed and matched; the underwater blowout preventer is supported by the supporting and binding structure, so that the underwater blowout preventer is kept fixed as a whole, and the driving member only needs to drive the pressure testing joint assembly to move, so that the pressure testing joint assembly and the underwater blowout preventer are sealed and matched, thereby completing the pressure testing operation, without driving the entire underwater blowout preventer to move. Then, firstly, a low-pressure test is performed; 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 the pressure is maintained for a first preset time; then, it is determined whether a leakage occurs; if no leakage occurs, a high-pressure test is performed; 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 the pressure is maintained for a second preset time; then, it is determined again whether a leakage occurs; if no leakage occurs, it is determined that the underwater blowout preventer has not leaked, and the hydraulic oil inside the underwater blowout preventer is discharged. Through the above-mentioned underwater blowout preventer pressure test method, a low-pressure test can be performed first, and then a high-pressure test can be performed to determine the sealing condition of the underwater blowout preventer. If no leakage occurs in both tests, it can be determined that the underwater blowout preventer has not leaked. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0032] Figure 22 is a second structural schematic diagram of the underwater blowout preventer pressure testing device according to an embodiment of the present invention;

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

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

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

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

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

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

[0039] In the figure:

[0040] 100. underwater blowout preventer; 200. lashing device; 300. underwater blowout preventer base;

[0041] 1. Base; 11. Support steel pipe; 12. Base panel; 121. Second through hole; 13. Upper reinforcing bracket; 14. Lower reinforcing bracket;

[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 chamber; 322. Hydraulic input chamber;

[0044] 4. Pressure test drill pipe joint; 401. Hollow pipe. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, 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 specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0049] Underwater blowout preventers are used to be set on the seabed to control and prevent blowouts. Before the underwater blowout preventer is lowered to the seabed wellhead for operation, it needs to be pressure tested, that is, pressure tested. The prior art provides a pressure test base and a pressure test system for storing underwater blowout preventers, which are provided with a pressure test base for placing underwater blowout preventers, and the pressure test base is provided with four height-adjustable hydraulic cylinder top rods, and pressure test piles are provided under the pressure test base. When it is necessary to pressure test the underwater blowout preventer, the underwater blowout preventer is first hoisted onto the four hydraulic cylinder top rods, and the height of the hydraulic cylinder top rods is adjusted so that the underwater blowout preventer reaches a suitable height, and then the underwater blowout preventer is pressure tested through the pressure test piles. However, there is a problem that when adjusting the relative height between the test pile and the underwater blowout preventer, the entire underwater blowout preventer needs to be driven to rise and fall vertically, and the weight of the underwater blowout preventer can reach 400 tons, which will lead to a waste of energy. In addition, during the process of raising and lowering the underwater blowout preventer, the underwater blowout preventer may also tilt, and there is a risk of the underwater blowout preventer falling.

[0050] Reference Figure 1 as well as Figure 3-Figure 7 The underwater blowout preventer pressure test device is used to support the underwater blowout preventer 100 and perform pressure test. The underwater blowout preventer pressure test device includes a support binding structure, a base 1, a driving member 2, and a pressure test joint assembly 3. The support binding structure is used to fix and support the underwater blowout preventer 100. In this embodiment, the support binding structure includes an underwater blowout preventer base 300 for supporting on the ground or deck, and also includes a binding device 200. The underwater blowout preventer base 300 is used to support the underwater blowout preventer 100 so that the underwater blowout preventer 100 remains fixed as a whole. The binding device 200 is used to bind the underwater blowout preventer 100 along the side wall to prevent the underwater blowout preventer 100 from tilting, and can be tightened and limited. The base 1 is used for supporting on the ground or the deck; the driving member 2 includes a fixing member 21 fixedly mounted on the base 1 and a telescopic member 22 capable of reciprocating and telescoping relative to the fixing member 21; the pressure test joint assembly 3 is arranged on the telescopic member 22, and the pressure test joint assembly 3 is used for sealingly cooperating 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 perform a pressure test operation on the underwater blowout preventer 100. The above-mentioned underwater blowout preventer pressure test device supports the underwater blowout preventer 100 through a supporting binding structure, so that the underwater blowout preventer 100 remains fixed as a whole. The driving member 2 only needs to drive the pressure test joint assembly 3 to move, so that the pressure test joint assembly 3 can be sealed and matched 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 underwater blowout preventer 100 from tilting during the pressure test, the pressure test should be performed on a stable deck of a ship or offshore structure, or on a horizontal ground, and the telescopic member 22 reciprocates in the vertical direction relative to the fixed member 21.

[0051] As an alternative solution, the BOP base 300 may be omitted, and the supporting binding structure only includes the binding device 200, and the underwater BOP 100 is bounded by the binding device 200 to prevent the underwater BOP 100 from tilting, and the underwater BOP 100 is directly supported on the pressure test joint assembly 3, and then supported by the base 1. In addition, under this solution, the underwater BOP pressure test device can simultaneously perform pressure test operations while providing support for the underwater BOP 100.

[0052] In addition, the underwater blowout preventer pressure testing device provided in this embodiment can also provide support for the underwater blowout preventer 100 when there is no need to perform pressure testing on the underwater blowout preventer 100, so as to temporarily store the underwater blowout preventer 100.

[0053] Continue to refer to Figure 1-Figure 7The pressure test joint assembly 3 is also provided with an injection pipeline 304 for providing 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 is provided with a pressure relief pipeline 302 for discharging the hydraulic oil from the pressure relief port 301, so that 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 through the injection port 303 and the injection pipeline 304 in sequence. Optionally, the injection pipeline 304 and the pressure relief pipeline 302 are both controlled by corresponding control valves.

[0054] Continue to refer to Figure 1-Figure 7 The pressure test joint assembly 3 includes a pressure test joint support 31 and a pressure test joint 32 arranged on the pressure test joint support 31. The pressure test joint support 31 is arranged on the telescopic member 22. The pressure test joint 32 is used to seal with the underwater blowout preventer 100. The pressure test joint support 31 is tubular, and the outer wall of the pressure test joint support 31 is provided with an opening 311, and the injection pipeline 304 and the pressure relief pipeline 302 both extend from the opening 311. Optionally, the pressure test joint 32 is also provided with a hydraulic input chamber 322 and a pressure relief chamber 321. The injection pipeline 304 is connected to the injection port 303 through the hydraulic input chamber 322, and the pressure relief port 301 is connected to the pressure relief pipeline 302 through the pressure relief chamber 321.

[0055] Continue to refer to Figure 1-Figure 7 The interior of the underwater blowout preventer 100 is used to install a pressure test drill pipe, which is used to replace and simulate the oil pipe in the oil well, and is arranged inside the underwater blowout preventer 100 for pressure testing. The gate of the underwater blowout preventer 100 can be sealed and abutted with the outer wall of the pressure test drill pipe. The underwater blowout preventer pressure test device also includes a pressure test drill pipe joint 4, which is used to connect with the pressure test drill pipe, and the pressure test drill pipe joint 4 and the pressure test joint assembly 3 can be abutted and matched, so that a sealed chamber for pressure testing is formed between the underwater 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 pipe 401 is provided 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 pipe 401 is connected to the pressure relief port 301. The pressure test drill pipe joint 4 is used to connect with the pressure test drill pipe so that the hollow pipe 401 is connected to the inner cavity of the pressure test drill pipe and forms a sealed cavity between the pressure test joint 32, the pressure test drill pipe joint 4, the pressure test drill pipe and the underwater blowout preventer 100. It can be understood that in order to ensure the sealing effect, a sealing steel ring should also be provided between the pressure test joint 32 and the underwater blowout preventer 100, so that when the pressure test is carried out, the pressure test drill pipe joint 4 can be installed on the pressure test drill pipe, and then the underwater blowout preventer 100 and the pressure test drill pipe are driven to move by the lifting structure, and then the pressure test drill pipe joint 4 and the pressure test joint assembly 3 are assembled. Optionally, the pressure test joint 32 has a groove at one end close to the pressure test drill rod joint 4, and the pressure test drill rod joint 4 can be inserted into the groove and abut against the groove wall of the groove to complete the assembly.

[0056] Continue to refer to Figure 1-Figure 7 The telescopic member 22 includes a piston 221 capable of reciprocating relative to the interior of 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. The support plate 223 is fixedly provided with a tubular steel ring seat 224. 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 member 31 is arranged in the steel ring seat 224. Optionally, the support plate 223 and the steel ring seat 224 are fixedly connected with a reinforcing rib 225 at the same time to increase the strength of the connection structure between the two. Optionally, the side wall of the steel ring seat 224 is provided with a notch 2241, and the notch 2241 is opposite to the opening 311, and the injection pipeline 304 and the pressure relief pipeline 302 can pass through the opening 311 and the notch 2241 in sequence.

[0057] Continue to refer to Figure 1-Figure 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, thereby allowing a certain displacement of the pressure test joint assembly 3 relative to the steel ring seat 224, which can be used to fine-tune the position of the pressure test joint assembly 3 relative to the steel ring seat 224.

[0058] Continue to refer to Figure 1-Figure 7 The piston 221 is arranged inside the fixing member 21 and divides the inside 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 also 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. The two connecting pipelines are used to control the hydraulic oil to enter and exit the rodless chamber and the rod chamber, and the amount of hydraulic oil in the rodless chamber and the rod chamber can be controlled, thereby driving the telescopic member 22 to move through the hydraulic oil. Optionally, the first connecting pipeline 23 and the second connecting pipeline 24 are both controlled by corresponding control valves.

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

[0060] Continue to refer to Figure 1-Figure 7 The support plate 223 is provided with an extension rod 26, which extends along the extension 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, the extension rod 26 is slidably penetrated through the first through hole 251 and the second through hole 121, and the movement of the extension rod 26 can be guided and limited by the first through hole 251 and the second through hole 121, thereby guiding and limiting the position of the support plate 223 to prevent it from tilting. Optionally, the extension rod 26 and the support plate 223 can be connected by a structure such as a bolt.

[0061] Reference Figure 8 This embodiment also provides an underwater blowout preventer pressure testing method, which is implemented by the above-mentioned underwater blowout preventer pressure testing device. The underwater blowout preventer pressure testing method includes the following steps.

[0062] S100: The underwater blowout preventer 100 is hoisted to the supporting binding structure, and the pressure test joint assembly 3 is driven to rise and fall by the driving member 2, so that the pressure test joint assembly 3 and the underwater blowout preventer 100 are sealed and matched.

[0063] The underwater blowout preventer 100 is supported by the supporting binding 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, so that the pressure test joint assembly 3 can be sealed and matched with the underwater blowout preventer 100, thereby completing the pressure test operation without driving the entire underwater blowout preventer 100 to move.

[0064] Optionally, before the underwater blowout preventer 100 is hoisted to the supporting binding structure, it should be confirmed that the sealing steel ring has been installed on the pressure test joint assembly 3. During operation, the underwater blowout preventer 100 is generally hoisted on the pressure test joint assembly 3, and the sealing steel ring is pressed, and then the pressure test drill pipe and the pressure test drill pipe joint 4 are hoisted into the underwater blowout preventer 100. Alternatively, the pressure test drill pipe and the pressure test drill pipe joint 4 are first hoisted to the pressure test joint assembly 3, and then the underwater blowout preventer 100 is lowered along the pressure test drill pipe to the pressure test joint assembly 3, but the operation difficulty of this solution 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, the pressure test joint assembly 3 is allowed to undergo a certain displacement 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 fine-tuned so that the pressure test joint assembly 3 and the pressure test drill pipe joint 4 can be assembled smoothly.

[0066] S200: Perform a low pressure test; the 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 a first oil pressure, and the pressure is maintained for a first preset time.

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

[0068] S300: Determine whether leakage occurs.

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

[0070] If no leakage occurs, step S400 is executed to proceed to the next step of the test.

[0071] Optionally, if leakage occurs, the test is stopped and the subsea blowout preventer 100 is overhauled.

[0072] S400: Perform a high pressure test; the 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 a second oil pressure, the second oil pressure is greater than the first oil pressure, and the pressure is maintained for a second preset time.

[0073] Generally speaking, high pressure test is the main process of underwater blowout preventer pressure test, and the required pressure holding time is relatively long, so 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 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.

[0075] In addition, in order to ensure the effect of the pressure test, the second oil pressure should be set to be greater than the working oil of the underwater blowout preventer 100.

[0076] S500: Determine again whether leakage occurs.

[0077] Specifically, whether leakage occurs can also be determined by detecting the oil pressure difference inside the underwater blowout preventer 100 before and after the test. If the oil pressure difference inside the underwater blowout preventer 100 is higher than a preset value, it is determined that leakage occurs. If the oil pressure difference inside the underwater blowout preventer 100 is not higher than the preset value, it is determined that no leakage occurs.

[0078] If no leakage occurs, it is determined that the underwater blowout preventer 100 does not leak, and step S600 is executed.

[0079] Optionally, if leakage occurs, the test is stopped and the subsea blowout preventer 100 is overhauled.

[0080] S600: Discharge the hydraulic oil inside the underwater blowout preventer 100.

[0081] Through the above-mentioned underwater blowout preventer pressure test method, a low-pressure test can be performed first, and then a high-pressure test can be performed to determine the sealing condition of the underwater blowout preventer 100. If no leakage occurs in both tests, it can be determined that the underwater blowout preventer 100 does not leak. At this time, the hydraulic oil inside the underwater blowout preventer 100 can be discharged to complete the pressure test operation.

[0082] Optionally, after the hydraulic oil in the underwater blowout preventer 100 is released, the underwater blowout preventer 100 and the pressure test drill pipe are moved to other positions by hoisting or the like, and then the pressure test drill pipe joint 4 and the pressure test drill pipe can be removed.

[0083] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An underwater blowout preventer pressure testing device, used to support an underwater blowout preventer (100) and perform pressure testing; characterized in that: The underwater blowout preventer pressure testing device comprises: A supporting lashing structure, used for fixing and supporting the underwater blowout preventer (100); A base (1) for supporting on the ground or a deck; A driving member (2) comprising a fixing member (21) fixedly mounted on the base (1) and a telescopic member (22) capable of reciprocating and telescoping relative to the fixing member (21); A pressure test joint assembly (3) is arranged on the telescopic member (22), the pressure test joint assembly (3) is used for sealingly cooperating with the underwater blowout preventer (100), and 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 perform a pressure test operation on the underwater blowout preventer (100).

2. The underwater blowout preventer pressure testing device according to claim 1, characterized in that: The pressure test joint assembly (3) is also 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 is provided with a pressure relief pipeline (302) for discharging the hydraulic oil from the pressure relief port (301).

3. The underwater blowout preventer pressure testing device according to claim 2, characterized in that: The pressure test joint assembly (3) comprises a pressure test joint support (31) and a pressure test joint (32) arranged on the pressure test joint support (31); the pressure test joint support (31) is arranged on the telescopic member (22); the pressure test joint (32) is used for sealingly cooperating with the underwater 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); the injection pipeline (304) and the pressure relief pipeline (302) both extend from the opening (311).

4. The underwater blowout preventer pressure testing device according to claim 1, characterized in that: The interior of the underwater blowout preventer (100) is used to install a pressure test drill pipe. The underwater blowout preventer pressure test device also includes a pressure test drill pipe joint (4). The pressure test drill pipe joint (4) is used to connect to the pressure test drill pipe, and the pressure test drill pipe joint (4) and the pressure test joint assembly (3) can be abutted and matched, so that a sealed chamber for pressure testing is formed between the underwater blowout preventer (100), the pressure test drill pipe, the pressure test joint assembly (3) and the pressure test drill pipe joint (4).

5. The underwater blowout preventer pressure testing device according to claim 1, characterized in that: The telescopic member (22) comprises a piston (221) capable of reciprocating relative to the interior of 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 provided on the support plate (223); and the bottom of the pressure test joint assembly (3) is arranged in the steel ring seat (224).

6. The underwater blowout preventer pressure testing device according to claim 5, characterized in that: 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).

7. The underwater blowout preventer pressure testing device according to claim 5, characterized in that: The piston (221) is arranged inside the fixing member (21) and divides the inside of the fixing member (21) into a rodless chamber and a rod chamber, the piston rod (222) is located in the rod chamber, and 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.

8. The underwater blowout preventer pressure testing device according to claim 5, characterized in that: The base (1) comprises a supporting steel pipe (11) for supporting on the ground or a deck and a base panel (12) arranged on the supporting steel pipe (11); the fixing member (21) is connected to a connecting plate (25); and the connecting plate (25) is fixedly connected to the base panel (12).

9. The underwater blowout preventer pressure testing device according to claim 8, characterized in that: The support plate (223) is provided with an extension rod (26), the extension rod (26) extending along the extension direction of the telescopic member (22), the connection 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) is slidably arranged through the first through hole (251) and the second through hole (121).

10. A method for testing the pressure of an underwater blowout preventer, characterized in that: The underwater blowout preventer pressure testing method is implemented by the underwater blowout preventer pressure testing device according to any one of claims 1 to 9, and the underwater blowout preventer pressure testing method comprises: S100: hoisting the underwater blowout preventer (100) to the supporting binding structure, and driving the pressure test joint assembly (3) to rise and fall by means of the driving member (2), so that the pressure test joint assembly (3) and the underwater blowout preventer (100) are in sealing cooperation; S200: performing a low-pressure test; performing the low-pressure test comprises: injecting hydraulic oil into the interior of the underwater blowout preventer (100), wherein the oil pressure inside the underwater blowout preventer (100) is a first oil pressure, and the pressure is maintained for a first preset time; S300: Determine whether leakage occurs; If no leakage occurs, execute step S400; S400: performing a high pressure test; performing the high pressure test comprises: injecting hydraulic oil into the interior of the underwater blowout preventer (100), wherein the oil pressure inside the underwater blowout preventer (100) is a second oil pressure, the second oil pressure is greater than the first oil pressure, and the pressure is maintained for a second preset time; S500: determining again whether leakage occurs; If no leakage occurs, it is determined that the underwater blowout preventer (100) does not leak, and step S600 is executed; S600: Discharging the hydraulic oil inside the underwater blowout preventer (100).

Images