Pressure testing apparatus and pressure testing method for subsea blowout preventer

Abstract

A pressure testing apparatus and pressure testing method for a subsea blowout preventer, relating to the technical field of subsea blowout preventer pressure testing. The pressure testing apparatus for a subsea blowout preventer is used for performing pressure testing on a subsea blowout preventer (100); a supporting and binding structure is configured to fixedly support the subsea blowout preventer (100); a base (1) is configured to be supported on the ground or a deck; a driving member (2) comprises a fixed member (21) fixedly mounted on the base (1) and a telescopic member (22) capable of reciprocatingly extending and retracting relative to the fixed member (21); and a pressure testing connector assembly (3) is provided on the telescopic member (22), is configured to be sealingly engaged with the subsea blowout preventer (100), and is provided with an injection port (301) configured to inject hydraulic oil into the subsea blowout preventer (100) so as to perform a pressure testing operation on the subsea blowout preventer (100). In the pressure testing apparatus for a subsea blowout preventer, the subsea blowout preventer (100) is supported by means of the supporting and binding structure, so that the entire subsea blowout preventer (100) remains fixed, and the driving member (2) only needs to drive the pressure testing connector assembly (3) to move, so that the pressure testing connector assembly (3) can be sealingly engaged with the subsea blowout preventer (100), thereby completing the pressure testing operation without driving the entire subsea blowout preventer (100) to move.

Description

Submersible blowout preventer pressure testing device and testing method Technical Field

[0001] This invention relates to the field of underwater blowout preventer pressure testing technology, and more particularly to underwater blowout preventer pressure testing device and method. Background Technology

[0002] Subsea blowout preventers (BOPs) are installed on the seabed to control and prevent well blowouts. A pressure test, or pressure rating test, is required before the BOP is lowered to the seabed wellhead for operation.

[0003] Existing technology provides a storage and testing base and system for underwater blowout preventers (BOPs). The system includes a testing base for holding the BOP, four height-adjustable hydraulic cylinder rods, and a testing pile below the base. When testing the BOP, it is first hoisted onto the four hydraulic cylinder rods, and the height of the rods is adjusted to achieve the appropriate height. Then, the BOP is tested using the testing pile. However, a problem exists: adjusting the relative height between the testing pile and the BOP requires vertically raising and lowering the entire BOP. Since the BOP can weigh up to 400 tons, this results in energy waste. Furthermore, the BOP may tilt during raising and lowering, posing a risk of it 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 requires the entire underwater blowout preventer to be raised and lowered vertically, which leads to energy waste and may cause the underwater blowout preventer to tilt.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An underwater blowout preventer (BOP) pressure testing device is used to support the underwater BOP and perform pressure testing; the underwater BOP pressure testing device includes:

[0007] A support and binding structure is provided for securing the underwater blowout preventer.

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

[0009] The driving component includes a fixing component fixedly installed on the base and a telescopic component capable of reciprocating and extending relative to the fixing component;

[0010] A pressure testing connector assembly is disposed on the telescopic member. The pressure testing connector assembly is used to seal with the underwater blowout preventer. The pressure testing connector 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.

[0011] As a preferred embodiment of the underwater blowout preventer pressure testing device, the pressure testing connector assembly is further provided with a connecting pipeline for supplying hydraulic oil to the injection port, and the pressure testing connector assembly has a pressure relief port for discharging hydraulic oil, and is provided with a pressure relief pipeline for discharging the hydraulic oil from the pressure relief port.

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

[0013] As a preferred embodiment of the underwater blowout preventer pressure testing device, the interior of the underwater blowout preventer is used to install a pressure testing drill rod. The underwater blowout preventer pressure testing device also includes a pressure testing drill rod connector, which is used to connect with the pressure testing drill rod. The pressure testing drill rod connector and the pressure testing connector assembly can abut against each other to form a sealed cavity for pressure testing between the underwater blowout preventer, the pressure testing drill rod, the pressure testing connector assembly, and the pressure testing drill rod connector.

[0014] As a preferred embodiment of the underwater blowout preventer pressure testing device, the telescopic component includes a piston capable of reciprocating relative to the interior of the fixed component, 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 testing joint assembly is disposed within the steel ring seat.

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

[0016] As a preferred embodiment of the underwater blowout preventer pressure testing device, the piston is disposed inside the fixed member and the interior of the fixed member is divided into a rodless chamber and a rod chamber, the piston rod is located in the rod chamber, and the drive unit further includes a first connecting pipe for hydraulic oil to enter and exit the rodless chamber and a second connecting pipe for hydraulic oil to enter and exit the rod chamber.

[0017] As a preferred embodiment of the underwater blowout preventer pressure testing 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, and the fastener is connected to a connecting plate, which is fixedly connected to the base panel.

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

[0019] According to another aspect of the present invention, a method for testing an underwater blowout preventer is provided, implemented by the aforementioned underwater blowout preventer testing apparatus, the method comprising:

[0020] S100: The underwater blowout preventer is hoisted to the support and binding structure, and the test joint assembly is raised and lowered by the drive component so that the test joint assembly is sealed and fitted with the underwater blowout preventer;

[0021] S200: Perform 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 if a leak has occurred;

[0023] If no leak occurs, proceed to step S400;

[0024] S400: Perform 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: Reassess whether a leak has occurred;

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

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

[0028] The beneficial effects of this invention are:

[0029] This invention provides an underwater blowout preventer (BOP) pressure testing device for supporting and testing an underwater BOP. The device includes a support and binding structure, a base, a drive component, and a pressure testing connector assembly. The support and binding structure securely supports the underwater BOP; the base supports it on land or a deck; the drive component includes a fixing component fixedly mounted on the base and a telescopic component capable of reciprocating relative to the fixing component; the pressure testing connector assembly is disposed on the telescopic component and is used for a sealing fit with the underwater BOP. The pressure testing connector assembly has an injection port for injecting hydraulic oil into the interior of the underwater BOP to perform the pressure testing operation. This underwater BOP pressure testing device, by supporting the underwater BOP with the support and binding structure, keeps the entire underwater BOP fixed. The drive component only needs to move the pressure testing connector assembly to seal the pressure testing connector assembly with the underwater BOP, thereby completing the pressure testing operation without moving the entire underwater BOP. In addition, the underwater blowout preventer pressure testing device can also provide support for the underwater blowout preventer when pressure testing is not required, so as to temporarily store the underwater blowout preventer; or, the underwater blowout preventer pressure testing device can simultaneously provide support for the underwater blowout preventer and perform pressure testing operations.

[0030] The present invention also provides a method for testing an underwater blowout preventer (BOP), implemented using the aforementioned underwater BOP testing device. In this method, the underwater BOP is hoisted onto a support and binding structure, and a driving component is used to raise and lower the test joint assembly, thereby ensuring a sealing fit between the test joint assembly and the underwater BOP. The support and binding structure supports the underwater BOP, keeping the entire underwater BOP fixed. The driving component only needs to move the test joint assembly to achieve a sealing fit between the test joint assembly and the underwater BOP, thus completing the pressure test without moving the entire underwater BOP. Then, a low-pressure test is first conducted. This includes injecting hydraulic oil into the submersible blowout preventer (BOP) to a first pressure and maintaining that pressure for a first preset time. A leak is then checked. If no leak occurs, a high-pressure test is conducted. This involves injecting hydraulic oil into the BOP to a second pressure, greater than the first pressure, and maintaining that pressure for a second preset time. Another leak is then checked. If no leak occurs, the BOP is confirmed to be leak-free, and the hydraulic oil inside the BOP is released. By using this pressure testing method, a low-pressure test followed by a high-pressure test can be performed to determine the sealing condition of the BOP. If no leak occurs in either test, it can be confirmed that the BOP is leak-free. Attached Figure Description

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

[0032] Figure 2 is a schematic diagram of the second structure of the underwater blowout preventer pressure testing device in an embodiment of the present invention;

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

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

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

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

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

[0038] Figure 8 is a flowchart of the underwater blowout preventer pressure test method in an embodiment of the present invention.

[0039] In the diagram: 100, Submersible BOP; 200, lashing device; 300, Submersible BOP base; 1, Base; 11, Support steel pipe; 12, Base panel; 121, Second through hole; 13, Upper reinforcing elbow plate; 14, Lower reinforcing elbow plate; 2, Drive component; 21, Fixing component; 22, Telescopic component; 221, Piston; 222, Piston rod; 223, Support plate; 224, Steel ring seat; 2241, Notch; 225, Reinforcing rib; 23, First connecting pipe; 24, Second connecting pipe; 25, Connecting plate; 251, First through hole; 26, Extension rod; 3. Pressure test connector assembly; 301. Pressure relief port; 302. Pressure relief pipeline; 303. Injection port; 304. Injection pipeline; 31. Pressure test connector support; 311. Opening; 32. Pressure test connector; 321. Pressure relief chamber; 322. Hydraulic input chamber; 4. Pressure test drill rod connector; 401. Hollow pipeline. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0041] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0044] Subsea blowout preventers (BOPs) are installed on the seabed to control and prevent well blowouts. Before being lowered to the seabed wellhead for operation, a pressure test, or pressure test, is required. Existing technology provides a storage and pressure testing base and system for subsea BOPs. This system includes a pressure testing base for holding the BOP, four height-adjustable hydraulic cylinder rods, and a pressure testing pile below the base. When a pressure test is required, the BOP is first hoisted onto the four hydraulic cylinder rods, and the height of the rods is adjusted to achieve the appropriate height. Then, the pressure is applied to the BOP via the pressure testing pile. However, the problem is that when adjusting the relative height between the test pile and the underwater blowout preventer, the entire underwater blowout preventer needs to be raised and lowered vertically. The weight of the underwater blowout preventer can reach 400 tons, which will lead to a waste of energy. In addition, during the raising and lowering of the underwater blowout preventer, it may also cause the underwater blowout preventer to tilt, which may result in the risk of the underwater blowout preventer falling.

[0045] Referring to Figures 1 and 3-7, the underwater blowout preventer (BOP) pressure testing device is used to support the underwater BOP 100 and perform pressure testing. The underwater BOP pressure testing device includes a support and binding structure, a base 1, a drive component 2, and a pressure testing connector assembly 3. The support and binding structure is used to fix and support the underwater BOP 100. In this embodiment, the underwater BOP 100 includes an underwater BOP base 300 for support on land or a deck, and also includes a binding device 200. The underwater BOP base 300 supports the underwater BOP 100 to keep the entire underwater BOP 100 fixed. The binding device 200 is used to bind the underwater BOP 100 along its sidewalls to prevent the underwater BOP 100 from tilting, and can be used to tighten and limit its position. The base 1 is used for support on the ground or deck; the drive unit 2 includes a fixing member 21 fixedly installed on the base 1 and a telescopic member 22 that can reciprocate and extend relative to the fixing member 21; the pressure test connector assembly 3 is disposed on the telescopic member 22, and the pressure test connector assembly 3 is used for sealing and engaging with the underwater blowout preventer 100. The pressure test connector 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 on the underwater blowout preventer 100. The above-mentioned underwater blowout preventer pressure test device supports the underwater blowout preventer 100 through a support and binding structure, keeping the underwater blowout preventer 100 as a whole fixed. The drive unit 2 only needs to drive the pressure test connector assembly 3 to move, which can seal and engage the pressure test connector assembly 3 with the underwater blowout preventer 100, thereby completing the pressure test, without moving the entire underwater blowout preventer 100. In this embodiment, in order to avoid the underwater blowout preventer 100 tilting during the pressure test, the pressure test should be carried out on a stable ship or offshore structure deck, or on a level ground. At this time, the telescopic member 22 reciprocates in the vertical direction relative to the fixed member 21.

[0046] As an alternative, the blowout preventer base 300 can be omitted, and the support and binding structure can consist only of a binding device 200. The underwater blowout preventer 100 is bound by the binding device 200 to prevent it from tilting. The underwater blowout preventer 100 is directly supported on the pressure test connector assembly 3, which in turn provides support through the base 1. Furthermore, in this solution, the underwater blowout preventer pressure test device can simultaneously perform pressure testing while providing support for the underwater blowout preventer 100.

[0047] 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 pressure test the underwater blowout preventer 100, so as to temporarily store the underwater blowout preventer 100.

[0048] Referring again to Figures 1-7, the pressure testing connector assembly 3 is further provided with an injection line 304 for supplying hydraulic oil to the injection port 303. The pressure testing connector assembly 3 has a pressure relief port 301 for discharging hydraulic oil, and a pressure relief line 302 for discharging hydraulic oil from the pressure relief port 301. Hydraulic oil can be discharged through the pressure relief line 302, while the hydraulic oil to be injected can be injected into the sealed cavity sequentially through the injection port 303 and the injection line 304. Optionally, both the injection line 304 and the pressure relief line 302 are controlled by corresponding control valves.

[0049] Referring again to Figures 1-7, the pressure testing connector assembly 3 includes a pressure testing connector support 31 and a pressure testing connector 32 disposed on the pressure testing connector support 31. The pressure testing connector support 31 is disposed on the telescopic member 22, and the pressure testing connector 32 is used for sealing cooperation with the underwater blowout preventer 100. The pressure testing connector support 31 is tubular, and an opening 311 is provided on the outer wall of the pressure testing connector support 31. The injection pipe 304 and the pressure relief pipe 302 both extend from the opening 311. Optionally, the pressure testing connector 32 is also provided with a hydraulic input chamber 322 and a pressure relief chamber 321. The injection pipe 304 and the injection port 303 are connected through the hydraulic input chamber 322, and the pressure relief port 301 and the pressure relief pipe 302 are connected through the pressure relief chamber 321.

[0050] Referring again to Figures 1-7, the interior of the subsea blowout preventer 100 is used to install a test drill pipe. This test drill pipe replaces and simulates the tubing in an oil well and is installed inside the subsea blowout preventer 100 for pressure testing. The gate of the subsea blowout preventer 100 can seal against the outer wall of the test drill pipe. The subsea blowout preventer pressure testing device also includes a test drill pipe connector 4, which is used to connect to the test drill pipe. The test drill pipe connector 4 and the test connector assembly 3 can abut against each other, forming a sealed cavity for pressure testing between the subsea blowout preventer 100, the test drill pipe, the test connector assembly 3, and the test drill pipe connector 4. Furthermore, in this embodiment, the test drill rod joint 4 is internally provided with a hollow pipe 401. The test drill rod is a hollow drill rod with an inner cavity. The hollow pipe 401 is connected to the pressure relief port 301. The test drill rod joint 4 is used to connect with the test drill rod so that the hollow pipe 401 is connected to the inner cavity of the test drill rod, forming a sealed cavity between the test joint 32, the test drill rod joint 4, the test drill rod, and the underwater blowout preventer 100. It is understood that, in order to ensure the sealing effect, a sealing steel ring should also be provided between the test joint 32 and the underwater blowout preventer 100. Thus, during the pressure test, the test drill rod joint 4 can be installed on the test drill rod, and then the underwater blowout preventer 100 and the test drill rod can be moved by the lifting structure, thereby completing the assembly of the test drill rod joint 4 and the test joint assembly 3. Optionally, the end of the pressure test connector 32 near the pressure test drill rod connector 4 has a groove, and the pressure test drill rod connector 4 can be inserted into the groove and abut against the groove wall to complete the assembly.

[0051] Referring again to Figures 1-7, 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. A tubular steel ring seat 224 is fixedly mounted on the support plate 223. The bottom of the pressure test connector assembly 3 is located within the steel ring seat 224; specifically, the bottom of the pressure test connector support member 31 is located within the steel ring seat 224. Optionally, reinforcing ribs 225 are fixedly connected to both the support plate 223 and the steel ring seat 224 to increase the structural strength of the connection between them. Optionally, a notch 2241 is provided on the side wall of the steel ring seat 224, directly opposite the opening 311, allowing the injection pipe 304 and the pressure relief pipe 302 to pass sequentially through the opening 311 and the notch 2241.

[0052] Referring 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 connector assembly 3, which allows the pressure test connector assembly 3 to undergo a certain displacement relative to the steel ring seat 224, which can be used to fine-tune the position of the pressure test connector assembly 3 relative to the steel ring seat 224.

[0053] Referring again to Figures 1-7, the piston 221 is disposed inside the fixing member 21, dividing 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 also includes a first connecting pipe 23 for hydraulic oil to enter and exit the rodless chamber and a second connecting pipe 24 for hydraulic oil to enter and exit the rod chamber. By controlling the flow of hydraulic oil into and out of the rodless and rod chambers through the two connecting pipes, the amount of hydraulic oil in the rodless and rod chambers can be controlled, thereby driving the telescopic member 22 to move. Optionally, both the first connecting pipe 23 and the second connecting pipe 24 are controlled by corresponding control valves.

[0054] Referring again to Figures 1-7, the base 1 includes a supporting steel pipe 11 for support on the ground or deck and a base panel 12 disposed on the supporting steel pipe 11. A fastener 21 connects to a connecting plate 25, which is fixedly connected to the base panel 12, specifically by bolts. Optionally, an upper reinforcing elbow plate 13 is fixedly disposed on the inner wall of the supporting steel pipe 11, and the upper reinforcing elbow plate 13 is fixedly connected to the base panel 12, thereby enhancing the structural strength of the connection between the supporting steel pipe 11 and the base panel 12; a lower reinforcing elbow plate 14 is fixedly disposed on the outer wall of the supporting steel pipe 11, and the lower reinforcing elbow plate 14 is fixedly connected to the ground or deck, thereby enhancing the structural strength of the connection between the supporting steel pipe 11 and the ground or deck. In other embodiments, the upper reinforcing elbow plate 13 can be disposed on the outer wall of the supporting steel pipe 11, and the lower reinforcing elbow plate 14 can be disposed on the inner wall of the supporting steel pipe 11, or both can be disposed on the outer wall of the supporting steel pipe 11, or both can be disposed on the inner wall of the supporting steel pipe 11.

[0055] Referring again to Figures 1-7, the support plate 223 is provided with an extension rod 26, which extends along the telescopic direction of the telescopic member 22. The connecting plate 25 has a first through hole 251, and the base panel 12 has a second through hole 121. The extension rod 26 slides through the first through hole 251 and the second through hole 121, which guides and limits the movement of the extension rod 26, thereby guiding and limiting the position of the support plate 223 and preventing it from tilting. Optionally, the extension rod 26 and the support plate 223 can be connected by bolts or other structures.

[0056] Referring to 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.

[0057] S100: The underwater blowout preventer 100 is hoisted onto the support and binding structure, and the test pressure connector assembly 3 is raised and lowered by the drive component 2 so that the test pressure connector assembly 3 is sealed and fitted with the underwater blowout preventer 100.

[0058] The underwater blowout preventer 100 is supported by a support and binding structure, so that the underwater blowout preventer 100 is kept fixed as a whole. The drive component 2 only needs to drive the pressure test connector assembly 3 to move, so as to seal the pressure test connector assembly 3 with the underwater blowout preventer 100 and complete the pressure test operation without moving the entire underwater blowout preventer 100.

[0059] Optionally, before hoisting the underwater blowout preventer 100 onto the supporting structure, it should be confirmed that the sealing steel ring has been installed onto the pressure testing connector assembly 3. During operation, the underwater blowout preventer 100 is generally hoisted onto the pressure testing connector assembly 3 first, and the sealing steel ring is tightened. Then, the pressure testing drill rod and pressure testing drill rod connector 4 are hoisted into the underwater blowout preventer 100. Alternatively, the pressure testing drill rod and pressure testing drill rod connector 4 can be hoisted onto the pressure testing connector assembly 3 first, and then the underwater blowout preventer 100 can be lowered onto the pressure testing connector assembly 3 along the pressure testing drill rod. However, this method is relatively more difficult to operate.

[0060] It is understandable that, due to the gap between the inner wall of the steel ring seat 224 and the outer wall of the pressure test connector assembly 3, the pressure test connector 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 connector assembly 3 relative to the steel ring seat 224 can be finely adjusted so that the pressure test connector assembly 3 and the pressure test drill rod connector 4 can be successfully assembled.

[0061] 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 the first oil pressure, and maintaining the pressure for a first preset time.

[0062] In this embodiment, the first preset time is specifically 5 minutes. 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.

[0063] S300: Determine if a leak has occurred.

[0064] Specifically, whether a leak has occurred 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 the preset value, a leak is confirmed. If the oil pressure difference inside the underwater blowout preventer 100 is not higher than the preset value, no leak is confirmed.

[0065] If no leak occurs, proceed to step S400 to continue with the next test.

[0066] Optionally, if a leak occurs, the test should be stopped and the underwater blowout preventer 100 should be inspected.

[0067] S400: Conduct 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, which is greater than the first oil pressure, and maintaining the pressure for a second preset time.

[0068] Generally speaking, high-pressure testing is the main process for testing underwater blowout preventers, and it requires a long pressure holding time. Therefore, the second preset time should be longer than the first preset time.

[0069] 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.

[0070] In addition, to ensure the effectiveness of the pressure test, the second oil pressure should be set to a working oil pressure 100 greater than that of the underwater blowout preventer.

[0071] S500: Reassess whether a leak has occurred.

[0072] Specifically, the presence or absence of leakage can be determined by measuring the pressure difference inside the underwater blowout preventer 100 before and after the test. If the pressure difference inside the underwater blowout preventer 100 is higher than the preset value, then leakage is confirmed. If the pressure difference inside the underwater blowout preventer 100 is not higher than the preset value, then no leakage is confirmed.

[0073] If no leakage occurs, it is determined that the underwater blowout preventer 100 is not leaking, and step S600 is executed.

[0074] Optionally, if a leak occurs, the test should be stopped and the underwater blowout preventer 100 should be inspected.

[0075] S600: Drains hydraulic oil from inside the underwater blowout preventer 100.

[0076] Using the above-mentioned underwater blowout preventer pressure test method, a low-pressure test can be performed first, followed by a high-pressure test, to determine the sealing condition of the underwater blowout preventer 100. If no leakage occurs in either test, it can be determined that the underwater blowout preventer 100 is not leaking. At this time, the hydraulic oil inside the underwater blowout preventer 100 can be released to complete the pressure test.

[0077] Optionally, after the hydraulic oil inside the underwater blowout preventer 100 is released, the underwater blowout preventer 100 and the test drill rod can be moved to other positions by means of hoisting or other means, and then the test drill rod joint 4 and the test drill rod can be removed.

[0078] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection 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 includes: A support and binding structure is provided for securing the underwater blowout preventer (100). A base (1) for support on the ground or deck; The driving component (2) includes a fixing component (21) fixedly installed on the base (1) and a telescopic component (22) capable of reciprocating and extending relative to the fixing component (21); A pressure test connector assembly (3) is provided on the telescopic member (22). The pressure test connector assembly (3) is used to seal with the underwater blowout preventer (100). The pressure test connector assembly (3) has an injection port (301) for injecting hydraulic oil into the interior of the underwater blowout preventer (100) to perform a pressure test on the underwater blowout preventer (100).

2. The underwater blowout preventer pressure testing device according to claim 1, characterized in that, The pressure test connector assembly (3) is also provided with a connecting pipe (302) for supplying hydraulic oil to the injection port (301). The pressure test connector assembly (3) has a pressure relief port (303) for discharging hydraulic oil and is provided with a pressure relief pipe (304) for discharging the hydraulic oil from the pressure relief port (303).

3. The underwater blowout preventer pressure testing device according to claim 2, characterized in that, The pressure test connector assembly (3) includes a pressure test connector support (31) and a pressure test connector (32) disposed on the pressure test connector support (31). The pressure test connector support (31) is disposed on the telescopic member (22). The pressure test connector (32) is used to seal with the underwater blowout preventer (100). The pressure test connector support (31) is tubular, and an opening (311) is provided on the outer wall of the pressure test connector support (31). The connecting pipe (302) and the pressure relief pipe (304) 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 test drill rod. The underwater blowout preventer test device also includes a test drill rod connector (4). The test drill rod connector (4) is used to connect with the test drill rod, and the test drill rod connector (4) and the test connector assembly (3) can abut against each other to form a sealed cavity for test pressure between the underwater blowout preventer (100), the test drill rod, the test connector assembly (3) and the test drill rod connector (4).

5. The underwater blowout preventer pressure testing device according to claim 1, characterized in that, 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), and the bottom of the test pressure joint assembly (3) is disposed inside 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 test joint assembly (3).

7. The underwater blowout preventer pressure testing device according to claim 5, characterized in that, The piston (221) is disposed 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) also includes a first connecting pipe (23) for hydraulic oil to enter and exit the rodless chamber and a second connecting pipe (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) includes a support steel pipe (11) for supporting on the ground or deck and a base panel (12) disposed on the support steel pipe (11). The fastener (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), which extends along the telescopic direction of the telescopic member (22). The connecting plate (25) has a first through hole (251), and the base panel (12) has a second through hole (121). The extension rod (26) slides 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, implemented using the underwater blowout preventer pressure testing apparatus as described in any one of claims 1-9, includes: S100: The underwater blowout preventer (100) is hoisted to the support and binding structure, and the test pressure connector assembly (3) is raised and lowered by the drive component (2) so that the test pressure connector assembly (3) is sealed and fitted with the underwater blowout preventer (100); 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 maintaining the pressure for a first preset time; S300: Determine if a leak has occurred; If no leak occurs, proceed to step S400; 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 maintaining the pressure for a second preset time; S500: Reassess whether a leak has occurred; If no leakage occurs, it is determined that the underwater blowout preventer (100) has not leaked, and step S600 is executed; S600: Drain the hydraulic oil inside the underwater blowout preventer (100).

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