Hydraulic safety valve system

Abstract

The utility model relates to the field of oil gas collection safety, in particular to a hydraulic safety valve system which comprises an oil return pipeline, a control cabinet and a hydraulic safety valve. The oil return pipeline is provided with a first quick discharge valve, the first quick discharge valve is arranged between the control cabinet and the hydraulic safety valve, the first quick discharge valve is provided with a pressure inlet, a pressure relief port and a pressure outlet, the pressure inlet is communicated with the control cabinet, the pressure outlet is communicated with the hydraulic safety valve, the pressure relief port is connected with a pressure relief pipeline, and the pressure relief pipeline is connected with the hydraulic safety valve. The pressure relief pipeline is communicated with the oil tank; by arranging the first quick discharge valve, when the hydraulic safety valve needs to release pressure, the pressure applying medium can be quickly discharged from the pressure release opening of the first quick discharge valve, so that the hydraulic safety valve can be quickly closed, and the use safety of the gas production wellhead is ensured.

Description

Technical Field

[0001] The utility model relates to the field of oil and gas collection safety, in particular to a hydraulic safety valve system. Background Art

[0002] As a safety cut-off valve for high-sulfur-resistant wellheads, the hydraulic safety valve is the last line of defense to ensure safe production in high-sulfur gas fields. It can prevent wellhead gas from leaking under high pressure. The closing time of the hydraulic safety valve refers to the time it takes for the valve to completely close from a fully open state. Factors that affect the closing time of the valve include the pressure in the cavity, the viscosity of the hydraulic oil, the spring force, and the oil return speed of the control system. Figure 1 As shown, currently the hydraulic safety valve at the gas production wellhead is directly connected to the control cabinet through the oil return pipeline, and the control cabinet controls the recovery of the pressurized medium in the hydraulic chamber of the hydraulic safety valve to close the hydraulic safety valve.

[0003] However, when the pressure in the well is low, field tests have shown that the closing time of the hydraulic safety valve at the gas wellhead is 4-30 minutes. The long closing time of the hydraulic safety valve is due to the slow oil return speed of the control system, which leads to a long closing time of the hydraulic safety valve, which does not meet the actual needs of rapid well closing on site.

[0004] Therefore, there is an urgent need for a technical solution to solve the technical problem of slow oil return speed of the hydraulic safety valve control system at the gas wellhead. Utility Model Content

[0005] The utility model aims to provide a hydraulic safety valve system to solve the technical problem that the oil return speed of the hydraulic safety valve control system of a gas production wellhead is too slow.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A hydraulic safety valve system comprises an oil return pipeline, a control cabinet and a hydraulic safety valve;

[0008] The oil return pipeline is provided with a first quick exhaust valve, which is arranged between the control cabinet and the hydraulic safety valve. The first quick exhaust valve is provided with a pressure inlet, a pressure relief port and a pressure outlet. The pressure inlet is communicated with the control cabinet, the pressure outlet is communicated with the hydraulic safety valve, the pressure relief port is connected to the pressure relief pipeline, and the pressure relief pipeline is connected to the oil tank.

[0009] The utility model discloses a hydraulic safety valve system, by arranging a quick exhaust valve on the oil return pipeline, so that when the hydraulic safety valve needs to be closed, the pressurized medium in the hydraulic safety valve does not need to be discharged into a control cabinet which is far away, but is directly discharged into the oil tank through the pressure relief port of the quick exhaust valve, thereby shortening the oil return path length of the hydraulic safety valve, thereby shortening the oil return time, reducing the closing time of the hydraulic safety valve, and realizing the rapid closing of the hydraulic safety valve.

[0010] As a preferred solution of the utility model, the oil return pipeline includes a first oil return pipeline and a second oil return pipeline, the first oil return pipeline is connected to the pressure inlet and the control cabinet, the second oil return pipeline is connected to the hydraulic safety valve and the pressure outlet, and a control valve is arranged on the first oil return pipeline and / or the second oil return pipeline. When the hydraulic safety valve is relieving pressure, the pressurized medium in the second oil return pipeline can be quickly discharged through the pressure relief port, so that the hydraulic safety valve can be quickly closed; by arranging a control valve in the first oil return pipeline or the second oil return pipeline, the control valve can cut off the first oil return pipeline or the second oil return pipeline, so that the operator can maintain the first quick exhaust valve.

[0011] As a preferred solution of the utility model, the control valve includes a first valve and a second valve, the first valve is arranged in the first oil return pipeline, and the second valve is arranged in the second oil return pipeline. By respectively arranging the first valve and the second valve in the first oil return pipeline and the second oil return pipeline, the first quick exhaust valve is isolated when the first valve and the second valve are both closed, and the operator can more conveniently replace the first quick exhaust valve that fails.

[0012] As a preferred solution of the utility model, it also includes an oil return branch, one end of which is connected to the hydraulic safety valve, and the other end is connected to the first oil return pipeline between the first valve and the control cabinet, and the oil return branch is provided with a third valve. The third valve is usually in a closed state; when the first valve is closed, the oil return branch is connected to the first oil return pipeline and the hydraulic safety valve by opening the third valve, so that the hydraulic safety valve can also operate normally when the first quick exhaust valve is maintained, thereby ensuring the safety of the gas production wellhead.

[0013] As a preferred solution of the utility model, the oil return branch is provided with a second quick exhaust valve, the second quick exhaust valve is located between the third valve and the hydraulic safety valve, and the second quick exhaust valve is connected to the oil tank. By providing the second quick exhaust valve on the oil return branch, the oil return branch can also realize the rapid closure of the hydraulic safety valve, and the second quick exhaust valve is connected to the oil tank.

[0014] As a preferred solution of the utility model, the first quick exhaust valve includes a valve body and a valve core, a storage space is provided inside the valve body, the valve core is slidably provided in the storage space, and the pressure inlet, the pressure relief port and the pressure outlet are all connected to the storage space. By changing the pressure of the pressure inlet, the valve core can switch different circulation routes; thus, the first quick exhaust valve can quickly discharge the liquid in the second oil return pipeline from the pressure relief port, so that the pressure of the hydraulic safety valve is quickly reduced, thereby realizing the rapid closure of the hydraulic safety valve.

[0015] As a preferred solution of the utility model, the valve body includes a cylindrical structure, the pressure inlet and the pressure relief port are respectively arranged at two ends of the cylindrical structure, and the pressure outlet is arranged on the side wall of the cylindrical structure, so as to facilitate the valve core to switch to different flow paths.

[0016] As a preferred solution of the utility model, the hydraulic safety valve comprises a control chamber and a safety valve, the control chamber is connected to the safety valve, and the control chamber is communicated with the pressure outlet. The control chamber can provide pressure to keep the hydraulic safety valve open, and when the pressure of the pressurized medium in the control chamber decreases, the hydraulic safety valve closes.

[0017] As a preferred solution of the utility model, the control cavity is provided with a hydraulic space, a partition is provided in the hydraulic space, the partition is slidably connected to the control cavity, and the partition divides the hydraulic space into a first control cavity and a second control cavity, the first control cavity is connected to the pressure outlet, and the second control cavity is connected to the safety valve. The safety valve is easier to control by dividing the hydraulic space with the partition.

[0018] As a preferred solution of the utility model, a spring member is provided in the hydraulic space, one end of the spring member is connected to the partition plate, and the other end is connected to the control cavity. The spring member enables the partition plate to have an initial pressure value, so that the partition plate can have an initial driving force on the cavity located on one side of the safety valve, so that the safety valve can be more easily controlled.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0020] 1. A hydraulic safety valve system of the utility model is provided with a quick exhaust valve on the oil return pipeline, so that when the hydraulic safety valve needs to be closed, the pressurized medium in the hydraulic safety valve does not need to be discharged into a control cabinet far away, but is directly discharged into the oil tank through the pressure relief port of the quick exhaust valve, thereby shortening the oil return path length of the hydraulic safety valve, thereby shortening the oil return time, reducing the closing time of the hydraulic safety valve, and realizing the rapid closing of the hydraulic safety valve.

[0021] 2. The utility model provides a hydraulic safety valve system with a simple structure, easy layout and convenient use. By setting a first quick exhaust valve, when the hydraulic safety valve needs to release pressure, the pressurized medium can be quickly discharged from the pressure relief port of the first quick exhaust valve, so that the safety valve can be quickly closed, ensuring the safe use of the gas wellhead, and having good economic value and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of an existing hydraulic safety valve control system;

[0023] Figure 2 is a structural schematic diagram of a hydraulic safety valve system of Example 1;

[0024] Figure 3 is a schematic diagram of the enlarged structure of the control cavity;

[0025] Figure 4 This is a schematic diagram of the first quick exhaust valve in use when pressure is applied;

[0026] Figure 5 This is a schematic diagram of the first quick exhaust valve in use during pressure relief;

[0027] Figure 6 is a structural schematic diagram of a hydraulic safety valve system of Example 2;

[0028] Figure 7 It is a structural schematic diagram of a hydraulic safety valve system of Example 3.

[0029] icon:

[0030] 1-return oil pipeline, 2-control cabinet, 3-hydraulic safety valve, 4-first quick exhaust valve, 5-oil tank, 6-first valve, 7-second valve, 8-return oil branch, 9-third valve, 101-first return oil pipeline, 102-second return oil pipeline, 31-control chamber, 32-safety valve, 41-valve body, 42-valve core, 43-pressure inlet, 44-pressure outlet, 45-pressure relief port, 311-hydraulic space, 312-partition, 313-spring member, 314-first control chamber, 315-second control chamber. DETAILED DESCRIPTION

[0031] The utility model is described in detail below in conjunction with the accompanying drawings.

[0032] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0033] Example 1

[0034] like Figure 2-Figure 5 A hydraulic safety valve system shown in the figure comprises an oil return pipeline 1, a control cabinet 2 and a hydraulic safety valve 3; the oil return pipeline 1 is provided with a first quick exhaust valve 4, the first quick exhaust valve 1 is arranged between the control cabinet 2 and the hydraulic safety valve 3, the first quick exhaust valve 4 is provided with a pressure inlet 43, a pressure relief port 45 and a pressure outlet 44, the pressure inlet 43 is communicated with the control cabinet 2, the pressure outlet 44 is communicated with the hydraulic safety valve 3, the pressure relief port 45 is connected to the pressure relief pipeline, and the pressure relief pipeline is connected to the oil tank 5;

[0035] The first quick exhaust valve 4 can communicate with the pressure inlet 43 and the pressure outlet 44 , or the first quick exhaust valve 4 can communicate with the pressure relief port 45 and the pressure outlet 44 .

[0036] A first quick exhaust valve 4 is arranged on the oil return pipeline 1, a pressure relief port 45 of the first quick exhaust valve 4 is connected to the oil tank 5 through the pressure relief pipeline, a pressure inlet 43 of the first quick exhaust valve 4 is connected to the control cabinet 2, and a pressure outlet 44 of the first quick exhaust valve 4 is connected to the hydraulic safety valve 3; when the hydraulic safety valve 3 is opened, a pressurized medium with a sufficiently large pressure is maintained in the hydraulic safety valve 3; when the hydraulic safety valve 3 needs to be closed, the pressure of the pressure inlet 43 is reduced by reducing the pressure of the control cabinet 2, so that the pressure relief port 45 of the first quick exhaust valve 4 is connected to the pressure outlet 44, so that the medium in the hydraulic safety valve 3 can be quickly discharged into the oil tank 5, so that the hydraulic safety valve 3 is quickly closed; when the hydraulic safety valve 3 needs to be opened, the pressure on the side of the pressure inlet 43 of the first quick exhaust valve 4 is increased, so that the pressure inlet 43 of the first quick exhaust valve 4 is connected to the pressure outlet 44, so that the hydraulic safety valve 3 is opened.

[0037] Specifically, the oil return pipeline 1 is composed of a first oil return pipeline 101 and a second oil return pipeline 102. The first oil return pipeline 101 is connected to the pressure port 43 and the control cabinet 2, and the second oil return pipeline 102 is connected to the hydraulic safety valve 3 and the pressure outlet 44. The first oil return pipeline 101 and the second oil return pipeline 102 are both provided with control valves; the control valves include a first valve 6 and a second valve 7, the first valve 6 is a stop valve, and the second valve 7 is a ball valve. The stop valve is arranged in the first oil return pipeline 101, and the ball valve is arranged in the second oil return pipeline 102; when in use, the first quick exhaust valve 4 can be isolated by closing the stop valve of the first oil return pipeline 101 and the ball valve of the second oil return pipeline 102, so that the operating personnel can replace the first quick exhaust valve 4 conveniently.

[0038] Specifically, in order to ensure that the hydraulic safety valve 3 can be effective even when the first quick exhaust valve 4 is maintained and avoid safety accidents, an oil return branch 8 is set in the hydraulic safety valve system, one end of the oil return branch 8 is connected to the hydraulic safety valve 3, and the other end is connected to the first oil return pipeline 101 located between the first valve 6 and the control cabinet 2, and a stop valve is set in the oil return branch 8 as the third valve 9; when the first quick exhaust valve 4 needs to be maintained, the third valve 9 can be opened to connect the oil return branch 8 to the first oil return pipeline 101 and the hydraulic safety valve 3, so that the control cabinet 2 can control the hydraulic safety valve 3, thereby avoiding the safety risk caused by the isolation of the first quick exhaust valve 4.

[0039] Specifically, the first quick exhaust valve 4 is composed of a valve body 41 and a valve core 42. An accommodating space is arranged inside the valve body 41. The valve core 42 is slidably arranged in the accommodating space and moves in the accommodating space through the valve core 42. The valve body 41 is a cylindrical structure. The pressure inlet 43 and the pressure relief port 45 are respectively arranged at the two ends of the cylindrical structure. The pressure outlet 44 is arranged on the side wall of the cylindrical structure, and the pressure outlet 44 penetrates the side wall of the cylindrical structure. The valve core 42 moves in the valve body 41. When the valve core 42 is located at different positions, the pressure outlet 44 and the pressure relief port 45 can be connected, or the pressure inlet 43 and the pressure outlet 44 can be connected. Therefore, the valve core 42 can control the pressurized medium in the second oil return pipeline 102 to be quickly discharged into the oil tank 5, so that the hydraulic safety valve 3 can be quickly closed.

[0040] Specifically, the hydraulic safety valve 3 is composed of a control chamber 31 and a safety valve 32, the control chamber 31 is connected to the safety valve 32, and the control chamber 31 is communicated with the pressure outlet 44; a hydraulic space 311 is provided in the control chamber 31, a spring member 313 and a partition 312 are provided in the hydraulic space 311, the partition 312 is slidably connected to the control chamber 31, and the partition 312 separates the hydraulic space 311 into a first control chamber 314 and a second control chamber 31, the first control chamber 314 is communicated with the pressure outlet 44, and the second control chamber 315 is communicated with the safety valve 32, and the two ends of the spring member 313 are respectively connected to the inner wall of the chamber and the partition 312, so that the partition 312 can push the liquid in the hydraulic space 311 to pressurize the safety valve 32, so that the safety valve 32 has an initial driving force, and it is easier to open or close the safety valve 32; the partition 312 is pushed by the pressurized medium, so that the partition 312 can drive the hydraulic safety valve 3.

[0041] Specifically, the pressure medium is hydraulic oil.

[0042] Specifically, increase the inner diameter of the pressure relief pipeline, shorten the discharge distance, and speed up the pressure release time.

[0043] In a hydraulic safety valve system of the present embodiment, the technical parameters of the first quick exhaust valve 4 are as follows: rated working pressure of 10000PSI, rated working temperature of -29℃-121℃, interface size of 1 / 2"NPT, material of 316SS, pressure inlet port 43103CV value of 1.0, pressure relief port 45105CV value of 4.82; when the pressure of the first oil return pipeline 101 is about 51.5% lower than the pressure of the second oil return pipeline 102, the valve core 42 of the first quick exhaust valve 4 will move, so that the pressurized medium in the second oil return pipeline 102 is discharged from the pressure relief port 45, and when the pressure of the first oil return pipeline 101 and the pressure of the second oil return pipeline 102 reach equilibrium, the valve core 42 will continue to return to the seat and stop pressure relief.

[0044] When the wellhead is not under pressure, a hydraulic safety valve system is used, and the closing time of the safety valve 32 is increased by 10-30 times; when the wellhead is under pressure, the valve closing efficiency is increased by about 10 times again; when the closing time of the field valve is less than 1 minute without pressure, the closing time under normal working conditions can be met for 4-5 seconds.

[0045] Example 2

[0046] like Figure 6 The hydraulic safety valve system shown has a structure that is substantially the same as that of Embodiment 1, but differs from Embodiment 1 in that the hydraulic safety valve system is connected to an oil return branch 8 .

[0047] Example 3

[0048] like Figure 7 The structure of a hydraulic safety valve system shown is substantially the same as that of Example 2. The difference from Example 2 is that neither the first oil return pipeline 101 nor the second oil return pipeline 102 is provided with a control valve.

[0049] Example 4

[0050] A hydraulic safety valve system of this embodiment has a structure substantially the same as that of Embodiment 1, except that the second quick exhaust valve is provided in the oil return branch 8, the second quick exhaust valve 4 is located between the third valve 9 and the hydraulic safety valve 3, and the second quick exhaust valve is connected to the oil tank.

[0051] Specifically, the structure of the second quick exhaust valve is the same as that of the first quick exhaust valve.

[0052] By arranging a second quick exhaust valve on the oil return branch, the oil return branch can also realize the rapid closing of the hydraulic safety valve.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 present invention.

Claims

1. A hydraulic safety valve system, characterized in that: It comprises an oil return pipeline (1), a control cabinet (2) and a hydraulic safety valve (3); The oil return pipeline (1) is provided with a first quick exhaust valve (4), which is arranged between the control cabinet (2) and the hydraulic safety valve (3), and the first quick exhaust valve (4) is provided with a pressure inlet (43), a pressure relief port (45) and a pressure outlet (44), the pressure inlet (43) is in communication with the control cabinet (2), the pressure outlet (44) is in communication with the hydraulic safety valve (3), the pressure relief port (45) is connected to a pressure relief pipeline, and the pressure relief pipeline is in communication with an oil tank (5).

2. A hydraulic safety valve system according to claim 1, characterized in that: The oil return pipeline (1) comprises a first oil return pipeline (101) and a second oil return pipeline (102); the first oil return pipeline (101) is connected to the pressure inlet (43) and the control cabinet (2); the second oil return pipeline (102) is connected to the hydraulic safety valve (3) and the pressure outlet (44); and a control valve is provided on the first oil return pipeline (101) and / or the second oil return pipeline (102).

3. A hydraulic safety valve system according to claim 2, characterized in that: The control valve comprises a first valve (6) and a second valve (7), the first valve (6) being arranged in the first oil return pipeline (101), and the second valve (7) being arranged in the second oil return pipeline (102).

4. A hydraulic safety valve system according to claim 3, characterized in that: It also comprises an oil return branch (8), one end of the oil return branch (8) being in communication with the hydraulic safety valve (3), and the other end of the oil return branch being in communication with the first oil return pipeline (101) located between the first valve (6) and the control cabinet (2), and a third valve (9) being provided on the oil return branch (8).

5. A hydraulic safety valve system according to claim 4, characterized in that: The oil return branch (8) is provided with a second quick exhaust valve, the second quick exhaust valve is located between the third valve (9) and the hydraulic safety valve (3), and the second quick exhaust valve is connected to the oil tank (5).

6. A hydraulic safety valve system according to claim 1, characterized in that: The first quick exhaust valve (4) comprises a valve body (41) and a valve core (42); a receiving space is provided inside the valve body (41); the valve core (42) is slidably disposed in the receiving space; the pressure inlet (43), the pressure relief port (45) and the pressure outlet (44) are all in communication with the receiving space.

7. A hydraulic safety valve system according to claim 6, characterized in that: The valve body (41) comprises a cylindrical structural member, the pressure inlet (43) and the pressure relief port (45) are respectively arranged at two ends of the cylindrical structural member, and the pressure outlet (44) is arranged on a side wall of the cylindrical structural member.

8. A hydraulic safety valve system according to claim 1, characterized in that: The hydraulic safety valve (3) comprises a control chamber (31) and a safety valve (32); the control chamber (31) is connected to the safety valve (32); and the control chamber (31) is in communication with the pressure outlet (44).

9. A hydraulic safety valve system according to claim 8, characterized in that: The control chamber (31) is provided with a hydraulic space (311), a partition (312) is provided in the hydraulic space (311), the partition (312) is slidably connected to the control chamber (31), and the partition (312) divides the hydraulic space into a first control chamber (314) and a second control chamber (315), the first control chamber (314) is in communication with the pressure outlet (44), and the second control chamber (315) is in communication with the safety valve (32).

10. A hydraulic safety valve system according to claim 9, characterized in that: The hydraulic space (311) is provided with a spring component (313), one end of the spring component (313) is connected to the partition plate (312), and the other end of the spring component (313) is connected to the control chamber (31).

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