Auxiliary shearing system of blowout preventer

Abstract

The utility model relates to the technical field of blowout preventer shearing, and discloses a blowout preventer auxiliary shearing system which comprises a control assembly, a second reversing valve, a blowout prevention assembly and an energy storage assembly, the control assembly comprises a first reversing valve, a power source is communicated with the first reversing valve, and the first reversing valve is used for controlling the power source to provide pressure liquid flow. The first reversing valve is communicated with the second reversing valve, the energy storage assembly is provided with an output end, the output end is communicated with the second reversing valve, the blowout preventer set is communicated with the second reversing valve, and the second reversing valve is used for selecting one of the pressure liquid flow of the power source and the pressure liquid flow of the energy storage assembly to the blowout preventer set for shearing operation. According to the auxiliary shearing system of the blowout preventer, auxiliary high-pressure shearing can be carried out, the operation steps of shearing are reduced, and the timeliness and the success rate of shearing are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of blowout preventer shearing, in particular to a blowout preventer auxiliary shearing system. Background Art

[0002] At present, the shear ram is sheared by closing the actuating drill pipe and controlled by means of valves in the blowout preventer control system. Although this technical principle seems simple, in fact, many factors need to be considered to ensure effective shearing. Since the probability of emergency operation of the shear ram at the drilling site is low, many factors have not been fully considered. Therefore, there is a certain doubt whether the shear can be successfully operated and the drill pipe can be sheared under the cooperation of the shear ram and the blowout preventer control system. At present, there are the following problems in the operation:

[0003] Situation 1: The structural configuration of the shear ram blowout preventer, including the shear ram blowout preventer with or without a booster cylinder. For example, for the shear ram blowout preventer without a booster cylinder, when performing ultra-high pressure operation shear greater than 21 MPa, a series of operation procedures need to be carried out on the blowout preventer control system, including opening the bypass, operating the shear ram valve to close, closing the accumulator isolation valve, opening the air source bypass valve, etc. This operation procedure is relatively cumbersome, prone to errors, and will cause a lag in the shear closing speed.

[0004] Situation 2: When the operator operates the shear, in an emergency, he forgets to open the bypass valve, resulting in a shear operation pressure of only about 10.5 MPa, which is too low to cut the drill pipe. This shows that the negligence or incorrect operation of the operator may affect the effect of the shear operation.

[0005] Situation 3: Before operating the shear ram, the bypass is opened first. However, if other ram blowout preventers have been operated before this action, the pressure of the blowout preventer control system may decrease at this time, resulting in insufficient pressure required for shearing. If it takes a certain time to restore the control system pressure, the best shearing opportunity may be missed. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a blowout preventer auxiliary shearing system, which can perform auxiliary high-pressure shearing, reduce the operation steps of shearing, and ensure the timeliness and success rate of shearing.

[0007] To achieve the above purpose, the utility model provides a blowout preventer auxiliary shearing system, including:

[0008] A control component, the control component includes a first reversing valve, the first reversing valve has a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is communicated with a liquid tank, the second valve port is communicated with a power source, the first reversing valve has a first state, a second state and a third state. When the first reversing valve is in the first state, the first valve port is communicated with the fourth valve port, and the second valve port is communicated with the third valve port; when the first reversing valve is in the second state, the first valve port, the second valve port, the third valve port and the fourth valve port are not communicated with each other; when the first reversing valve is in the third state, the first valve port is communicated with the third valve port, and the second valve port is communicated with the fourth valve port;

[0009] A second reversing valve, the second reversing valve has a fifth valve port, a sixth valve port and a seventh valve port, the second reversing valve has an auxiliary state and a shearing state. When the second reversing valve is in the auxiliary state, the sixth valve port is communicated with the seventh valve port; when the second reversing valve is in the shearing state, the fifth valve port is communicated with the seventh valve port; the fourth valve port is communicated with the fifth valve port;

[0010] A blowout preventer group, the blowout preventer group has a first input port and a second input port, the third valve port is communicated with the first input port; the seventh valve port is communicated with the second input port;

[0011] An energy storage component, the energy storage component has an output end, and the output end is communicated with the sixth valve port.

[0012] Further, the energy storage component includes an energy storage pipeline, a safety valve and a plurality of energy storage units. One end of the energy storage pipeline is communicated with a pressure source, the other end of the energy storage pipeline is communicated with the safety valve, the output ends of the plurality of energy storage units are all communicated with the energy storage pipeline, and the energy storage pipeline is communicated with the sixth valve port.

[0013] Furthermore, the energy storage component further includes a check valve and a first pressure gauge. The check valve is arranged on the energy storage pipeline and on the upstream side of the energy storage unit close to the pressure source and the connection between the energy storage pipeline and the sixth valve port, and the first pressure gauge is arranged on the energy storage pipeline and on the downstream side of the check valve.

[0014] Furthermore, the energy storage component further includes a pressure relief switch. Both ends of the pressure relief switch are respectively connected to the energy storage pipeline and the liquid tank, and the pressure relief switch is located on the downstream side of the check valve.

[0015] Furthermore, the energy storage assembly further includes a shuttle valve and a third reversing valve. The shuttle valve has a first inlet, a second inlet, and an outlet. The third reversing valve has an eighth valve port, a ninth valve port, and a tenth valve port. The third reversing valve has a fourth state and a fifth state. When the third reversing valve is in the fourth state, the ninth valve port communicates with the tenth valve port. When the third reversing valve is in the fifth state, the eighth valve port communicates with the tenth valve port. The eighth valve port is connected to the liquid tank, the ninth valve port is connected to the energy storage pipeline, the first inlet communicates with the fourth valve port, the second inlet communicates with the tenth valve port, the outlet communicates with the hydraulic control end of the second reversing valve, and the third reversing valve also has a manual end.

[0016] Furthermore, a pressure reducing valve is connected between the energy storage pipeline and the ninth valve port.

[0017] Furthermore, a second pressure gauge is provided between the seventh valve port and the second input port.

[0018] Compared with the prior art, the blowout preventer auxiliary shearing system according to an embodiment of the present invention has the following beneficial effects: When shearing is required, the first reversing valve is switched to the third state, and the second reversing valve is switched to the shearing state. The liquid flow of the power source sequentially passes through the second valve port, the fourth valve port, the fifth valve port, the seventh valve port, and the second input port and flows into the blowout preventer group to control the shearing ram for shearing. If the pressure provided by the power source is not sufficient to drive the shearing ram of the blowout preventer group to shear, the second reversing valve can be directly switched from the shearing state to the auxiliary state. At this time, the liquid flow of the energy storage assembly enters the blowout preventer group from its output end through the sixth valve port, the seventh valve port, and the second input port, thereby driving the shearing ram to shear. Only by switching the state of the second reversing valve can the high-pressure liquid flow of the energy storage assembly be used to drive the shearing ram to shear, reducing cumbersome operation steps and ensuring the timeliness and success rate of shearing. Description of the Drawings

[0019] Figure 1 is the overall circuit diagram of the blowout preventer auxiliary shearing system according to an embodiment of the present invention;

[0020] Figure 2 is the symbol diagram of the second reversing valve of the blowout preventer auxiliary shearing system according to an embodiment of the present invention;

[0021] Figure 3 is the symbol diagram of the third reversing valve of the blowout preventer auxiliary shearing system according to an embodiment of the present invention;

[0022] Figure 4 is the symbol diagram of the shuttle valve of the blowout preventer auxiliary shearing system according to an embodiment of the present invention;

[0023] In the figure, 1 is a control component; 11 is a first reversing valve; 111 is a first valve port; 112 is a second valve port; 113 is a third valve port; 114 is a fourth valve port;

[0024] 2 is a power source;

[0025] 3 is a second reversing valve; 31 is a fifth valve port; 32 is a sixth valve port; 33 is a seventh valve port;

[0026] 4 is a blowout preventer group; 41 is a first input port; 42 is a second input port;

[0027] 5 is an energy storage component; 51 is an energy storage pipeline; 52 is a safety valve; 53 is an energy storage unit; 54 is a check valve; 55 is a first pressure gauge; 56 is a pressure relief switch; 57 is a shuttle valve; 571 is a first inlet; 572 is a second inlet; 573 is an outlet; 58 is a third reversing valve; 581 is an eighth valve port; 582 is a ninth valve port; 583 is a tenth valve port; 59 is a pressure reducing valve;

[0028] 6 is a pressure source;

[0029] 7 is a second pressure gauge. Detailed implementation manners

[0030] The following will further describe in detail the detailed implementation manners of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0031] In the description of the present utility model, the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "lateral", "longitudinal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present utility model and simplifying the description, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to specific circumstances.

[0032] In the description of the present utility model, the terms "provided with", "set", "connected", "placed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] In addition, terms such as "first", "second", etc. are mainly used to distinguish different devices, components or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, components or parts. Unless otherwise specified, the meaning of "a plurality of" is two or more.

[0034] The technical solution of the present utility model will be further described below in conjunction with embodiments and drawings.

[0035] As Figure 1 、 2 shown, an auxiliary shearing system for a blowout preventer according to an embodiment of the present utility model includes:

[0036] A control assembly 1, the control assembly 1 includes a first reversing valve 11, the first reversing valve 11 has a first valve port 111, a second valve port 112, a third valve port 113 and a fourth valve port 114, the first valve port 111 is communicated with a liquid tank, the second valve port 112 is communicated with a power source 2, the first reversing valve 11 has a first state, a second state and a third state. When the first reversing valve 11 is in the first state, the first valve port 111 is communicated with the fourth valve port 114, and the second valve port 112 is communicated with the third valve port 113; when the first reversing valve 11 is in the second state, the first valve port 111, the second valve port 112, the third valve port 113 and the fourth valve port 114 are not communicated with each other; when the first reversing valve 11 is in the third state, the first valve port 111 is communicated with the third valve port 113, and the second valve port 112 is communicated with the fourth valve port 114;

[0037] A second reversing valve 3, the second reversing valve 3 has a fifth valve port 31, a sixth valve port 32 and a seventh valve port 33, the second reversing valve 3 has an auxiliary state and a shearing state. When the second reversing valve 3 is in the auxiliary state, the sixth valve port 32 is communicated with the seventh valve port 33; when the second reversing valve 3 is in the shearing state, the fifth valve port 31 is communicated with the seventh valve port 33; the fourth valve port 114 is communicated with the fifth valve port 31;

[0038] A blowout preventer group 4, the blowout preventer group 4 has a first input port 41 and a second input port 42, the third valve port 113 is communicated with the first input port 41; the seventh valve port 33 is communicated with the second input port 42;

[0039] An energy storage assembly 5, the energy storage assembly 5 has an output end, and the output end is communicated with the sixth valve port 32.

[0040] Based on the above technical solution, when shearing is required, the first reversing valve 11 is switched to the third state, and the second reversing valve 3 is switched to the shearing state. The liquid flow of the power source 2 sequentially passes through the second valve port 112, the fourth valve port 114, the fifth valve port 31, the seventh valve port 33, and the second input port 42, and flows into the blowout preventer group 4 to control the shearing gate to perform shearing. If the pressure provided by the power source 2 is not sufficient to drive the shearing gate of the blowout preventer group 4 to perform shearing, the second reversing valve 3 can be directly switched from the shearing state to the auxiliary state. At this time, the liquid flow of the energy storage assembly 5 is introduced into the sixth valve port 32, the seventh valve port 33, and the second input port 42 from its output end and flows into the blowout preventer group 4, so as to drive the shearing gate to perform shearing. Only by switching the state of the second reversing valve 3 can the high-pressure liquid flow of the energy storage assembly 5 be used to drive the shearing gate to perform shearing, reducing cumbersome operation steps and ensuring the timeliness and success rate of shearing.

[0041] Preferably, the energy storage assembly 5 includes an energy storage pipeline 51, a safety valve 52, and a plurality of energy storage units 53. One end of the energy storage pipeline 51 is communicated with the pressure source 6, the other end of the energy storage pipeline 51 is communicated with the safety valve 52, the output ends of the plurality of energy storage units 53 are all communicated with the energy storage pipeline 51, and the energy storage pipeline 51 is communicated with the sixth valve port 32. The energy storage assembly 5 includes a plurality of energy storage units 53, and the output end of each energy storage unit 53 is communicated with the energy storage pipeline 51. Each energy storage unit 53 is independent of each other, which can prevent the overall failure of the energy storage assembly 5 when one of the energy storage units 53 fails, and still maintain the output of high-pressure liquid flow; the safety valve 52 can prevent the pressure in the energy storage pipeline 51 from being too high. When the pressure in the energy storage pipeline 51 reaches the rated pressure of the safety valve 52, part of the liquid flow can be discharged from the safety valve 52, keeping the liquid flow in the energy storage pipeline 51 at a relatively stable pressure value. At the same time, when switching between the shearing state and the auxiliary state of the second reversing valve 3, it can avoid the unbearable impact on the second reversing valve 3 caused by excessive high pressure in the energy storage pipeline 51.

[0042] More preferably, the energy storage assembly 5 further includes a check valve 54 and a first pressure gauge 55. The check valve 54 is arranged on the energy storage pipeline 51 and on the upstream side of the energy storage unit 53 close to the pressure source 6 and the connection between the energy storage pipeline 51 and the sixth valve port 32, and the first pressure gauge 55 is arranged on the energy storage pipeline 51 and on the downstream side of the check valve 54. A check valve 54 is arranged between the pressure source 6 and the energy storage unit 53. The liquid flow flows from the pressure source 6 through the check valve 54 to the energy storage unit 53. When the energy storage unit 53 maintains high pressure, the check valve 54 can prevent the high-pressure liquid flow in the energy storage pipeline 51 downstream of the check valve 54 from flowing back to the pressure source 6, ensuring that the pressure source 6 will not be impacted by the high-pressure liquid flow; the first pressure gauge 55 can monitor the pressure situation in the energy storage pipeline 51 in real time.

[0043] More preferably, the energy storage assembly 5 further includes a pressure relief switch 56. The two ends of the pressure relief switch 56 are respectively connected to the energy storage pipeline 51 and the liquid tank, and the pressure relief switch 56 is located on the downstream side of the one-way valve 54. The two ends of the pressure relief switch 56 are respectively communicated with the liquid tank and the energy storage pipeline 51. When the energy storage assembly 5 is used up, the pressure relief switch 56 can be opened to discharge the remaining liquid flow in the energy storage pipeline 51 to the liquid tank, avoiding the energy storage pipeline 51 and the energy storage unit 53 being in a high-pressure environment all the time, and reducing the possibility of damage to the energy storage pipeline 51 and the energy storage unit 53.

[0044] More preferably, as Figure 3 , 4 shown, the energy storage assembly 5 further includes a shuttle valve 57 and a third reversing valve 58. The shuttle valve 57 has a first inlet 571, a second inlet 572 and an outlet 573. The third reversing valve 58 has an eighth valve port 581, a ninth valve port 582 and a tenth valve port 583. The third reversing valve 58 has a fourth state and a fifth state. When the third reversing valve 58 is in the fourth state, the ninth valve port 582 is communicated with the tenth valve port 583; when the third reversing valve 58 is in the fifth state, the eighth valve port 581 is communicated with the tenth valve port 583; the eighth valve port 581 is connected to the liquid tank, the ninth valve port 582 is connected to the energy storage pipeline 51, the first inlet 571 is communicated with the fourth valve port 114, the second inlet 572 is communicated with the tenth valve port 583, the outlet 573 is connected to the hydraulic control end of the second reversing valve 3, and the third reversing valve 58 further has a manual end.

[0045] Based on the above technical solution, when the first reversing valve 11 is in the third state and the second reversing valve 3 is in the shearing state, the liquid flow of the power source 2 sequentially passes through the second valve port 112, the fourth valve port 114, the fifth valve port 31, the seventh valve port 33, and the second input port 42. The liquid flow of the power source 2 sequentially passes through the second valve port 112, the fourth valve port 114, the first inlet 571, and the outlet 573 and flows to the hydraulic control end of the second reversing valve 3. If the pressure provided by the power source 2 is not sufficient to drive the shearing gate of the blowout preventer group 4 to shear, the power source 2 still continues to input liquid flow, and the pressure at the hydraulic control end of the second reversing valve 3 rises until the second reversing valve 3 switches from the shearing state to the auxiliary state. At this time, the high-pressure liquid flow in the energy storage unit 53 and the energy storage pipeline 51 flows to the sixth valve port 32, the seventh valve port 33, and the second input port 42, thereby driving the shearing gate to perform a shearing motion. When the shearing is completed, the first reversing valve 11 is switched to the first state. At this time, the liquid flow between the fourth valve port 114 and the hydraulic control end of the second reversing valve 3 and between the fourth valve port 114 and the fifth valve port 31 can be drained. At this time, after the hydraulic control end of the second reversing valve 3 is drained, it is reset by the spring and switched back to the shearing state. The fifth valve port 31, the seventh valve port 33, and the second input port 42 are communicated, and the second input port 42 of the blowout preventer group 4 is drained. The liquid flow input by the power source 2 is communicated with the first input port 41 through the second valve port 112 and the third valve port 113 and flows into the shearing open position cavity of the blowout preventer group.

[0046] The state of the third reversing valve 58 can also be actively manually switched to the fourth state. The liquid flow in the energy storage pipeline 51 sequentially flows into the ninth valve port 582, the tenth valve port 583, the second inlet 572, and the outlet 573 to the hydraulic control end of the second reversing valve 3, and directly drives the second reversing valve 3 to switch from the shearing state to the auxiliary state through the high-pressure liquid flow, so as to perform shearing.

[0047] More preferably, a pressure reducing valve 59 is connected between the energy storage pipeline 51 and the ninth valve port 582. The pressure reducing valve 59 is provided to prevent the high-pressure liquid flow from directly impacting the third reversing valve 58, the shuttle valve 57, and the hydraulic control end of the second reversing valve 3, and to extend the service life of each structure.

[0048] More preferably, a second pressure gauge 7 is provided between the seventh valve port 33 and the second input port 42. The second pressure gauge 7 is provided to monitor the liquid flow pressure during shearing in a timely manner.

[0049] In summary, the embodiment of the present utility model provides a blowout preventer auxiliary shearing system. When shearing is required, the first reversing valve 11 is switched to the third state, and the second reversing valve 3 is switched to the shearing state. The liquid flow of the power source 2 sequentially passes through the second valve port 112, the fourth valve port 114, the fifth valve port 31, the seventh valve port 33, and the second input port 42 and flows into the blowout preventer group 4 to control the shearing ram for shearing. If the pressure provided by the power source 2 is not sufficient to drive the shearing ram of the blowout preventer group 4 to shear, the second reversing valve 3 can be directly switched from the shearing state to the auxiliary state. At this time, the liquid flow of the energy storage assembly 5 is introduced from its output end into the sixth valve port 32, the seventh valve port 33, and the second input port 42 and flows into the blowout preventer group 4, thereby driving the shearing ram to shear. Only by switching the state of the second reversing valve 3 can the high-pressure liquid flow of the energy storage assembly 5 be used to drive the shearing ram to shear, reducing cumbersome operation steps and ensuring the timeliness and success rate of shearing.

[0050] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present utility model.

Claims

1. A blowout preventer auxiliary shearing system, characterized in that: include: A control component (1), the control component (1) comprising a first reversing valve (11), the first reversing valve (11) having a first valve port (111), a second valve port (112), a third valve port (113) and a fourth valve port (114), the first valve port (111) being in communication with a liquid tank, the second valve port (112) being in communication with a power source (2), the first reversing valve (11) having a first state, a second state and a third state, and when the first reversing valve (11) is in the first state, the first valve port (111) and the fourth valve port (114) are in communication with each other. The first valve port (111) is connected to the third valve port (114), and the second valve port (112) is connected to the third valve port (113); when the first reversing valve (11) is in the second state, the first valve port (111), the second valve port (112), the third valve port (113) and the fourth valve port (114) are not connected to each other; when the first reversing valve (11) is in the third state, the first valve port (111) is connected to the third valve port (113), and the second valve port (112) is connected to the fourth valve port (114); a second reversing valve (3), the second reversing valve (3) having a fifth valve port (31), a sixth valve port (32) and a seventh valve port (33); the second reversing valve (3) having an auxiliary state and a shear state; when the second reversing valve (3) is in the auxiliary state, the sixth valve port (32) is in communication with the seventh valve port (33); when the second reversing valve (3) is in the shear state, the fifth valve port (31) is in communication with the seventh valve port (33); and the fourth valve port (114) is in communication with the fifth valve port (31); A blowout preventer group (4), the blowout preventer group (4) having a first input port (41) and a second input port (42), the third valve port (113) being connected to the first input port (41); the seventh valve port (33) being connected to the second input port (42); An energy storage component (5), wherein the energy storage component (5) has an output end, wherein the output end is connected to the sixth valve port (32).

2. The blowout preventer auxiliary shearing system according to claim 1, characterized in that: The energy storage assembly (5) comprises an energy storage pipeline (51), a safety valve (52) and a plurality of energy storage units (53); one end of the energy storage pipeline (51) is connected to a pressure source (6); the other end of the energy storage pipeline (51) is connected to the safety valve (52); the output ends of the plurality of energy storage units (53) are all connected to the energy storage pipeline (51); and the energy storage pipeline (51) is connected to the sixth valve port (32).

3. The blowout preventer auxiliary shearing system according to claim 2, characterized in that: The energy storage assembly (5) further comprises a one-way valve (54) and a first pressure gauge (55); the one-way valve (54) is arranged on the energy storage pipeline (51) and is located on the upstream side of the energy storage unit (53) close to the pressure source (6) and the connection between the energy storage pipeline (51) and the sixth valve port (32); the first pressure gauge (55) is arranged on the energy storage pipeline (51) and is located on the downstream side of the one-way valve (54).

4. The blowout preventer auxiliary shearing system according to claim 3, characterized in that: The energy storage component (5) further comprises a pressure relief switch (56), the two ends of which are respectively connected to the energy storage pipeline (51) and the liquid tank, and the pressure relief switch (56) is located on the downstream side of the one-way valve (54).

5. The blowout preventer auxiliary shearing system according to claim 2, characterized in that: The energy storage assembly (5) further comprises a shuttle valve (57) and a third reversing valve (58), wherein the shuttle valve (57) has a first inlet (571), a second inlet (572) and an outlet (573), and the third reversing valve (58) has an eighth valve port (581), a ninth valve port (582) and a tenth valve port (583). The third reversing valve (58) has a fourth state and a fifth state. When the third reversing valve (58) is in the fourth state, the ninth valve port (582) is connected to the tenth valve port (583); when the third reversing valve (58) is in the fourth state, the ninth valve port (582) is connected to the tenth valve port (583); When the three-way reversing valve (58) is in the fifth state, the eighth valve port (581) is connected to the tenth valve port (583); the eighth valve port (581) is connected to the liquid tank, the ninth valve port (582) is connected to the energy storage pipeline (51), the first inlet (571) is connected to the fourth valve port (114), the second inlet (572) is connected to the tenth valve port (583), the outlet (573) is connected to the hydraulic control end of the second reversing valve (3), and the third reversing valve (58) also has a manual end.

6. The blowout preventer auxiliary shearing system according to claim 5, characterized in that: A pressure reducing valve (59) is connected between the energy storage pipeline (51) and the ninth valve port (582).

7. The blowout preventer auxiliary shearing system according to claim 1, characterized in that: A second pressure gauge (7) is provided between the seventh valve port (33) and the second input port (42).

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