Control system for blowout preventer

Abstract

The present application belongs to the technical field of oil and gas exploration, and particularly relates to a control system of blowout prevention equipment, which is used to solve the technical problems of large space occupation and high fracturing operation cost of the control system. The control system comprises an energy storage module, at least one control module, and a first connecting pipeline connecting the energy storage module and the control module. In the control module, a control pipeline is sequentially provided with a pressure relief overflow valve and at least two first branches, each of which is connected with a control valve, and a plurality of control valves control a group of blowout prevention equipment. In the energy storage module, the first ends of an oil suction pipeline and an oil return pipeline are connected with a first oil tank, the second ends of the oil suction pipeline and the oil return pipeline are connected with an energy storage pipeline, and the energy storage pipeline is further connected with an energy storage device. The number of control modules is adjusted to control a plurality of groups of blowout prevention equipment, ensure the safety of a plurality of wellheads, and reduce the space occupied by the control system of the blowout prevention equipment and the fracturing operation cost by sharing one energy storage module.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the oil and gas exploration technical field, in particular to a control system of blowout preventer equipment. BACKGROUND

[0002] In order to increase the production of oil and gas, the fracturing process is usually used in the mining process. With the increasing depth of the formation of the operation, the depth of the formation can reach more than 2000 meters. In order to further reduce the production cost and improve the operation efficiency, the number of wellheads arranged on each well platform is continuously increased, and the distance between the wellheads is continuously reduced. The arrangement of multiple adjacent wellheads can effectively expand the reservoir drainage area, connect the fault block structure, and is beneficial to improve the single well productivity and the ultimate recovery ratio of the oil and gas field. At the same time, the land acquisition and the ground engineering scale can be reduced, the number of fracturing pipe running can be reduced, the construction cost can be reduced, the construction time can be reduced, and the comprehensive development benefit of the oil and gas field can be improved.

[0003] Due to the formation development, the running and lowering of the working string and other downhole work in the fracturing process, the wellhead safety also becomes a key factor restricting the fracturing progress and reducing the fracturing completion cost. In order to ensure the wellhead safety in the deep well fracturing process, each wellhead usually has a set of blowout preventer equipment and a control system thereof, and the control system of each set of blowout preventer equipment controls the blowout preventer equipment of the same set. Among them, the blowout preventer equipment includes a blowout preventer and a choke and kill manifold, and the control system of the blowout preventer equipment includes a hydraulic blowout preventer control device and a choke control box, the hydraulic blowout preventer control device controls the blowout preventer, and the choke control box controls the valve on the choke and kill manifold. However, the control system of the blowout preventer equipment occupies a large space, and when multiple wellheads are operated at the same time, a corresponding number of hydraulic blowout preventer control devices and choke control boxes need to be arranged, resulting in high fracturing operation cost. SUMMARY

[0004] In view of the above problems, the embodiment of the present application provides a control system of blowout preventer equipment to reduce the space occupied by the control system of the blowout preventer equipment and reduce the fracturing operation cost.

[0005] In order to achieve the above purpose, the embodiment of the present application provides the following technical scheme:

[0006] The embodiment of the present application provides a control system of blowout preventer equipment, which comprises: an energy storage module, at least one control module, and a first connecting pipeline;

[0007] The control module comprises a control pipeline, along the first end to the second end of the control pipeline, the control pipeline is sequentially provided with a pressure relief overflow valve and at least two first branches, each first branch is communicated with a control valve, and a plurality of control valves control a set of blowout preventer equipment;

[0008] The energy storage module comprises a first oil tank, an oil suction pipeline, an oil return pipeline and an energy storage pipeline, the first ends of the oil suction pipeline and the oil return pipeline are communicated with the first oil tank, the second ends of the oil suction pipeline and the oil return pipeline are communicated with the first end of the energy storage pipeline, along the first end to the second end of the energy storage pipeline, the energy storage pipeline is sequentially provided with a first switch valve and a second branch, and the second branch communicates with an energy accumulator;

[0009] The two ends of the first connecting pipeline are communicated with the first end of the control pipeline and the second end of the energy storage pipeline respectively;

[0010] In the initial state, the hydraulic oil in the first oil tank is transmitted to the energy accumulator through the oil suction pipeline, the energy storage pipeline and the second branch; in the working state, the hydraulic oil in the energy accumulator is transmitted to the control valve through the second branch, the energy storage pipeline, the first connecting pipeline, the control pipeline and the first branch, so as to control the opening of the blowout preventer; in the disassembly state, the hydraulic oil in the first branch, the control pipeline, the first connecting pipeline and the energy storage pipeline is transmitted to the first oil tank through the oil return pipeline.

[0011] In some possible embodiments, the number of control modules is at least two, and at least two control modules are connected in series; the control system further comprises a second connecting pipeline, and the two ends of the second connecting pipeline are communicated with the second end of the control pipeline in the front-stage control module and the first end of the control pipeline in the rear-stage control module respectively.

[0012] In some possible embodiments, the control pipeline and the second connecting pipeline are connected through a first quick connector, and the second connecting pipeline is provided with a first stop valve.

[0013] In some possible embodiments, the pressure relief overflow valve is further connected in parallel with a first ball valve;

[0014] And / or, the first end of the control pipeline and the pressure relief overflow valve are further sequentially provided with a first pressure gauge and a third oil filter, and the pressure relief overflow valve and the first branch are further provided with a second pressure gauge.

[0015] In some possible embodiments, along the direction away from the first oil tank, the oil suction pipeline is sequentially provided with a second stop valve, a first oil filter, an oil suction pump and a check valve, and the oil return pipeline is sequentially provided with a third stop valve and an oil return pump.

[0016] In some possible embodiments, an oil injection pipeline is arranged between the first oil filter and the oil suction pump, and the oil injection pipeline is communicated with an external oil tank by sequentially arranging a second oil filter and a fourth stop valve;

[0017] An oil drain pipeline is arranged between the oil suction pump and the check valve, and the oil drain pipeline is communicated with the second oil tank through a fifth stop valve.

[0018] In some possible embodiments, the number of the oil suction pipelines is at least two, and the at least two oil suction pipelines are in parallel.

[0019] In some possible embodiments, the energy storage module further comprises a skid-mounted body, and the first oil tank, the oil suction pipeline, the oil return pipeline, the energy storage pipeline, the second branch, the first switch valve and the energy accumulator are arranged on the skid-mounted body.

[0020] The control module further comprises a main body frame, and the control pipeline, the pressure relief overflow valve, the at least two first branches and the control valve are arranged on the main body frame.

[0021] In some possible embodiments, a second switch valve is arranged on the second branch, and the first switch valve and the second switch valve each comprise a second ball valve in parallel.

[0022] In some possible embodiments, the first connecting pipeline is communicated with the energy storage pipeline through a second quick connector, the first connecting pipeline is communicated with the control pipeline through a third quick connector, and the first connecting pipeline is provided with a sixth stop valve.

[0023] The control system of the blowout prevention equipment provided by the embodiment of the present application has at least the following advantages.

[0024] In the control system of the blowout prevention equipment provided by the embodiment of the present application, at least one control module is connected with an energy storage module through a first connecting pipeline, and each control module is connected with a group of blowout prevention equipment. Since the wellheads are relatively dispersed and the number is relatively large in multi-well fracturing operation, the control module and the energy storage module in the embodiment of the present application are distributed, and can be respectively arranged at required positions. The control module can be arranged near the wellhead of the fracturing operation, the control module is adjacent to the wellhead, the reaction time can be shortened, and the misoperation can be reduced, and the energy storage module can be arranged at a position not hindering other structures. In addition, compared with the case that a group of blowout preventers and their control systems are arranged at each wellhead, in the blowout prevention equipment in the embodiment of the present application, each control module can control a group of blowout prevention equipment, the number of the blowout prevention equipment can be adjusted by adjusting the number of the control modules, the safety of the multi-wellheads can be ensured, the energy storage module provides hydraulic oil for all the blowout prevention equipment, the structure of the control system of the blowout prevention equipment is simplified, the space occupied is smaller, space is saved, fuel consumption and overall fracturing operation cost are reduced, and yield increase is facilitated.

[0025] In addition to the technical problems solved by the embodiments of the present application, the technical features constituting the technical solutions and the beneficial effects brought by the technical features, the other technical problems solved by the control system of the blowout prevention equipment, the other technical features included in the technical solutions and the beneficial effects brought by the technical features will be further described in detail in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0027] Figure 1 FIG. 1 is a structural schematic diagram of the control system of the blowout prevention equipment in the embodiments of the present application;

[0028] Figure 2 FIG. 2 is another structural schematic diagram of the control system of the blowout prevention equipment in the embodiments of the present application.

[0029] Explanation of reference signs:

[0030] 1 - pry body; 2 - fifth stop valve;

[0031] 3 - oil suction pump; 4 - first oil filter;

[0032] 5 - check valve; 6 - first oil tank;

[0033] 7 - oil return pump; 8 - first on-off valve;

[0034] 9 - energy accumulator; 10 - sixth stop valve;

[0035] 11 - first pressure gauge; 12 - first ball valve;

[0036] 13 - pressure relief overflow valve; 14 - second pressure gauge;

[0037] 15 - control valve; 16 - main frame;

[0038] 17 - third oil filter; 18 - control pipeline;

[0039] 19 - second quick connector; 20 - third quick connector;

[0040] 21 - first quick connector. DETAILED DESCRIPTION

[0041] The embodiment of the present application provides a control system of blowout preventer equipment, the control system is provided with distributed control modules and energy storage modules, and the control modules and the energy storage modules are connected through first connecting pipelines, the control modules can be arranged at required positions, and the energy storage modules can be arranged at specified safe areas. Each wellhead is provided with a group of blowout preventer equipment, each control module controls a group of blowout preventer equipment corresponding to one wellhead, and one energy storage module is shared by the control modules, the control system of the blowout preventer equipment occupies smaller space, fuel consumption and overall fracturing operation cost can be reduced, and yield increase can be facilitated.

[0042] In order to make the above-mentioned purpose, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0043] Referring to Figure 1 The control system of the blowout preventer equipment provided in the embodiments of the present application can include an energy storage module, a control module and a first connecting pipeline. The energy storage module is used for storing hydraulic oil and providing the hydraulic oil to the control module and a plurality of groups of blowout preventer equipment. The energy storage module can be arranged at a position where each structure in the control system of the blowout preventer equipment is not hindered, for example, a position away from a wellhead or a specified safe area. The control module is connected to one group of blowout preventer equipment and is used for controlling the opening and closing of the group of blowout preventer equipment so that the group of blowout preventer equipment can work. The control module can be arranged near a wellhead corresponding to the group of blowout preventer equipment to facilitate operation. The first connecting pipeline is connected to the energy storage module and the control module to enable the hydraulic oil to be supplied from the energy storage module to the control module or recycled from the control module to the energy storage module.

[0044] Specifically, the control module includes a control pipeline 18, two ends of the control pipeline 18 are a first end and a second end, along the first end to the second end of the control pipeline 18, the control pipeline 18 is sequentially provided with a pressure relief overflow valve 13 and at least two first branches, each first branch is connected with a control valve 15, and a plurality of control valves 15 control one group of blowout preventer equipment. The energy storage module includes a first oil tank 6, an oil suction pipeline, an oil return pipeline and an energy storage pipeline, the first ends of the oil suction pipeline and the oil return pipeline are connected with the first oil tank 6, the second ends of the oil suction pipeline and the oil return pipeline are connected with the first end of the energy storage pipeline, along the first end to the second end of the energy storage pipeline, the energy storage pipeline is sequentially provided with a first switch valve 8 and a second branch, and the second branch is connected with an energy storage device 9. Two ends of the first connecting pipeline are connected with the first end of the control pipeline 18 and the second end of the energy storage pipeline.

[0045] As shown in Figure 1 The first end of the control pipeline 18 is connected to the energy storage module. In the direction away from the energy storage module, the control pipeline 18 is sequentially provided with a pressure relief overflow valve 13 and at least two first branches. The pressure relief overflow valve 13 can reduce the pressure of the hydraulic oil provided by the energy storage module and adjust the flow of the hydraulic oil, so that the high-pressure hydraulic oil provided by the energy storage module is converted into low-pressure hydraulic oil before entering the first branch and finally entering the multiple groups of blowout prevention equipment. The pressure of the high-pressure hydraulic oil is not less than 21 MPa, and the pressure of the low-pressure hydraulic oil can be set by the pressure relief overflow valve 13.

[0046] The number of first branches can be two or more, and these first branches are sequentially connected on the control pipeline 18. Each first branch is connected to each control object in the same group of blowout prevention equipment through a control valve 15. That is, the control valves 15 on all first branches jointly control the action of a group of blowout prevention equipment.

[0047] Specifically, a group of blowout prevention equipment includes a blowout preventer and a choke and kill manifold, and the blowout preventer and the choke and kill manifold are matched. The multiple control valves 15 can respectively control the opening and closing actions of the blowout preventer in the same group of blowout prevention equipment, and the opening degree of the valve on the choke and kill manifold, so as to close the wellhead and simultaneously adjust the flow route of the fluid or gas in the well, control the pressure in the well, and prevent blowout. For example, as shown in Figure 1 The number of first branches is six, and the control valves 15 are six, which can control six control objects in a group of blowout prevention equipment.

[0048] Optionally, the control valve 15 is a three-position four-way directional valve, for example, a three-position four-way rotary valve. The three-position four-way directional valve has three positions and four oil ports. The three positions are open position, middle position and closed position, and the four oil ports are oil inlet port, first working port, second working port and oil return port, and the oil return port is connected to an oil return tank. When the three-position four-way directional valve is in the open position (left position as shown in Figure 1 ), the oil inlet port and the first working port are communicated, the second working port and the oil return port are communicated, and the blowout preventer and the choke and kill manifold are opened. When the three-position four-way directional valve is in the middle position (middle position as shown in Figure 1 ), the oil inlet port and the oil return port are communicated, the first working port and the second working port are closed, and the three-position four-way directional valve is unloaded. When the three-position four-way directional valve is in the closed position (right position as shown in Figure 1 ), the oil inlet port and the second working port are communicated, the first working port and the oil return port are communicated, and the blowout preventer and the choke and kill manifold are closed.

[0049] Optionally, the first branch can be connected with the control pipeline 18 through a fourth quick connector, on one hand, the first branch can realize the communication between the control pipeline 18 and the control valve 15, realizing the entering and returning of the hydraulic oil; on the other hand, the first branch and the control pipeline 18 can be detachably connected, when the control valve 15 of a first branch or several first branches fails and needs to be repaired, the corresponding first branch can be removed for replacement, facilitating the repair.

[0050] In some possible embodiments, the pressure relief overflow valve 13 is also connected in parallel with the first ball valve 12; and / or, the first end of the control pipeline 18 and the pressure relief overflow valve 13 are further sequentially provided with the first pressure gauge 11 and the third oil filter 17, and the pressure relief overflow valve 13 and the first branch are further provided with the second pressure gauge 14. The first ball valve 12 can realize bypassing, when the first ball valve 12 is opened, the high-pressure hydraulic oil of the energy storage module is directly supplied to the control valve 15 without passing through the pressure relief overflow valve 13, so as to realize the rapid shut-in.

[0051] The first pressure gauge 11 and the third oil filter 17 are sequentially arranged before the pressure relief overflow valve 13, the first pressure gauge 11 can measure the pressure of the energy storage module supplied to the control module, and the third oil filter 17 can filter the high-pressure hydraulic oil to protect the pressure relief overflow valve 13 and the first ball valve 12. The second pressure gauge 14 is arranged after the pressure relief overflow valve 13 and before the first branch, and can measure the pressure of the control pipeline 18 supplied to the first branch.

[0052] Wherein, the control pipeline 18 can be provided with only the first ball valve 12, or only the first pressure gauge 11, the third oil filter 17 and the second pressure gauge 14, or simultaneously provided with the first ball valve 12, the first pressure gauge 11, the third oil filter 17 and the second pressure gauge 14. In the embodiment of the application, from the first end to the second end of the control pipeline 18, the first pressure gauge 11, the third oil filter 17, the pressure relief overflow valve 13, the second pressure gauge 14 and at least two first branches are sequentially arranged, wherein the pressure relief overflow valve 13 is connected in parallel with the first ball valve 12.

[0053] In some possible embodiments, referring to Figure 2 , the number of control modules is at least two, and the at least two control modules are connected in series; the control system further comprises a second connecting pipeline, two ends of the second connecting pipeline are respectively communicated with the second end of the control pipeline 18 in the front-stage control module and the first end of the control pipeline 18 in the rear-stage control module.

[0054] Specifically, the number of control modules can be multiple, and the multiple control modules are connected in series. Among them, the connection in series between the multiple control modules refers to the connection in series of the control pipelines 18 in the multiple control modules. By setting multiple control modules, the number of blowout prevention equipment controlled by the control device of the blowout prevention system can be increased by assembling the control modules, thereby increasing the total number of wellheads for fracturing and the number of wellheads for simultaneous fracturing, and improving the production yield.

[0055] The number of control modules is adapted to the number of wellheads, and the multiple control modules correspond one-to-one to the multiple wellheads. That is, each wellhead corresponds to a control module to control a group of blowout preventers in the wellhead.

[0056] The second connecting pipeline connects adjacent two control modules, one end of the second connecting pipeline communicates with the second end of the control pipeline 18 in the previous stage control module, and the other end of the second connecting pipeline communicates with the first end of the control pipeline 18 in the next stage control module. Among them, in the adjacent two control modules, the control module close to the energy storage module is the previous stage control module, and the control module away from the energy storage module is the next stage control module. That is, in the flow direction of the hydraulic oil, the control module first passed by the hydraulic oil is the previous stage control module, and the control module passed by the hydraulic oil is the next stage control module.

[0057] In some possible implementations, the control pipeline 18 and the second connecting pipeline are connected through the first quick connector 21, and the second connecting pipeline is provided with a first stop valve. The second connecting pipeline and the adjacent two control modules are connected through the first quick connector 21 to facilitate the connection between the control modules. The first stop valve is arranged on the second connecting pipeline to cut off the passage between the two control modules connected by the second connecting pipeline.

[0058] The first quick connector 21 includes a first male head and a first female head matched with each other, and one first male head and one first female head form a group. Among the two ends of the control pipeline 18 and the second connecting pipeline connected to each other, one is provided with a first male head, and the other is provided with a first female head, so as to connect one end of the control pipeline 18 with one end of the second connecting pipeline. The adjacent two control pipelines 18 and the second connecting pipeline are provided with two groups of first male heads and first female heads.

[0059] For example, the control pipeline 18 in two adjacent control modules in series, the second end of the control pipeline 18 in the former control module is connected with one end of the second connecting pipeline, and the other end of the second connecting pipeline is connected with the first end of the control pipeline 18 in the next control module. The second end of the control pipeline 18 in the former control module can be provided with one of a group of first male heads or first female heads, and one end of the second connecting pipeline is provided with the other of the same group of first male heads or first female heads. The other end of the second connecting pipeline is provided with one of another group of first male heads or first female heads, and the first end of the control pipeline 18 in the next control module can be provided with the other of the other group of first male heads or first female heads.

[0060] In some possible embodiments, the control module further comprises a main frame 16, and the control pipeline 18, the pressure relief overflow valve 13, the at least two first branches and the control valve 15 are all arranged on the main frame 16. That is, the main frame 16 is a mounting base, and the control pipeline 18, the first branches and the elements thereon are all arranged on the main frame 16. In the embodiments in which the control module further comprises the first pressure gauge 11, the second pressure gauge 14, the third oil filter 17 and the first ball valve 12, the first pressure gauge 11, the second pressure gauge 14, the third oil filter 17 and the first ball valve 12 are also arranged on the main frame 16.

[0061] Continuing to refer to Figure 1 and Figure 2 , the first oil tank 6 provides hydraulic oil to the energy accumulator 9 through the oil suction pipeline, the energy storage pipeline and the second branch, so as to realize energy storage. The energy accumulator 9 provides hydraulic oil to the control pipeline 18 and the first branch of the control module through the second branch, the energy storage pipeline and the first connecting pipeline, so as to realize control of the blowout prevention equipment. The hydraulic oil in the first branch, the control pipeline 18, the first connecting pipeline, the energy storage pipeline and the second branch is collected back to the first oil tank 6 through the oil return passage, so as to avoid spilling of the hydraulic oil to the ground when disassembling, and reduce pollution of the hydraulic oil to the ground.

[0062] Specifically, the first end of the oil suction pipeline and the first end of the oil return pipeline are both in communication with the first oil tank 6, the second end of the oil suction pipeline and the second end of the oil return pipeline are both in communication with the first end of the energy storage pipeline, and the second end of the energy storage pipeline is in communication with the first connecting pipeline; along the first end to the second end of the energy storage pipeline, the energy storage pipeline is sequentially provided with the first switch valve 8 and the second branch, and the second branch is in communication with the energy accumulator 9.

[0063] Optionally, the second branch is provided with a second switch valve, and the first switch valve 8 and the second switch valve each include a second ball valve in parallel. The first switch valve 8 can control the conduction and cutoff of the energy storage pipeline, and the second switch valve can control the conduction and cutoff of the second branch. The first switch valve 8 and the second switch valve each include a second ball valve in parallel, so that the first switch valve 8 and the second switch valve have a redundant design, and the reliability of the first switch valve 8 and the second switch valve can be improved.

[0064] Optionally, the number of the second branches can be multiple, and the multiple second branches are sequentially arranged on the energy storage pipeline. The energy storage device 9 can be an energy storage device steel cylinder. In this way, the energy storage module can include multiple energy storage devices 9 to store more energy. For example, the embodiment of the present application has six second branches, and there are six energy storage devices 9.

[0065] In some possible implementations, the energy storage pipeline includes two branches, one of which is connected to the control module, and the other of which is provided with multiple second branches. In this way, the arrangement of the energy storage devices 9 is facilitated.

[0066] Continuing to refer to Figure 1 and Figure 2 In some possible embodiments, in the direction away from the first oil tank 6, the oil suction pipeline is sequentially provided with a second stop valve, a first oil filter 4, an oil suction pump 3, and a check valve 5, and the oil return pipeline is sequentially provided with a third stop valve and an oil return pump 7.

[0067] As shown in Figure 1 and Figure 2 , the second stop valve can disconnect the passage between the oil suction pipeline and the first oil tank 6, the first oil filter 4 can filter the hydraulic oil entering the oil suction pump 3, the oil suction pump 3 can input the hydraulic oil in the first oil tank 6 to the energy storage device 9, and the check valve 5 can prevent the hydraulic oil from flowing back. The third stop valve can disconnect the passage between the oil return pipeline and the first oil tank 6, and the oil return pump 7 can suck the hydraulic oil accumulated in each pipeline into the first oil tank 6. Optionally, the oil suction pump 3 and the oil return pump 7 can each be an electric oil pump.

[0068] On the basis of the above-mentioned embodiments, in some possible examples, an oil injection pipeline is arranged between the first oil filter 4 and the oil suction pump 3, the oil injection pipeline is in communication with an external oil tank through a second oil filter and a fourth stop valve arranged in sequence; an oil discharge pipeline is arranged between the oil suction pump 3 and the check valve 5, and the oil discharge pipeline is in communication with a second oil tank through a fifth stop valve 2.

[0069] Specifically, one end of the oil injection pipeline is connected between the first oil filter 4 and the oil suction pump 3, and the other end of the oil injection pipeline is connected to an external oil tank. The oil injection pipeline can be connected to the first oil tank 6 and the external oil tank, and when the hydraulic oil in the first oil tank 6 is insufficient, the external oil tank supplies oil to the first oil tank 6 to ensure that the amount of hydraulic oil in the first oil tank 6 is sufficient. The oil injection pipeline is sequentially provided with a second oil filter and a fourth stop valve, and the second oil filter is close to the oil suction pipeline. The second oil filter filters the hydraulic oil entering the first oil tank 6, and the fourth stop valve controls the opening and closing of the oil injection pipeline.

[0070] One end of the oil discharge pipeline is connected between the oil suction pump 3 and the check valve 5, and the other end of the oil discharge pipeline is connected to the second oil tank. The oil discharge pipeline can discharge oil from the oil suction pipeline. The fifth stop valve 2 is arranged on the oil discharge pipeline, and the fifth stop valve 2 controls the opening and closing of the oil discharge pipeline.

[0071] In some possible embodiments, the number of oil suction pipelines is at least two, and the at least two oil suction pipelines are connected in parallel. In this way, on the one hand, the reliability of the connection between the first oil tank 6 and the energy storage pipeline can be improved, and on the other hand, sufficient power can be provided to quickly deliver the hydraulic oil in the first oil tank 6 to the energy storage device 9.

[0072] In some possible embodiments, the energy storage module further includes a pry-mounted body 1, and the first oil tank 6, the oil suction pipeline, the oil return pipeline, the energy storage pipeline, the second branch, the first switch valve 8, and the energy storage device 9 are all arranged on the pry-mounted body 1. That is, the energy storage module is a pry-mounted energy storage module, so as to facilitate the movement of the energy storage module, thereby arranging the energy storage module at a position where the various pipelines and branches in the control system of the blowout prevention equipment do not interfere with each other.

[0073] Specifically, the pry-mounted body 1 includes a pry-mounted base and a pry-mounted frame, and the pry-mounted frame is arranged on the pry-mounted base. The first oil tank 6, the oil suction pump 3, the oil return pump 7, and the energy storage device 9 are fixedly installed on the pry-mounted base, and other components such as the oil suction pipeline, the oil return pipeline, the energy storage pipeline, the second branch, and the valves and other elements in the above-mentioned pipelines and branches are fixedly installed on the pry-mounted frame.

[0074] Continuing to refer to Figure 1 and Figure 2 , the first connection pipeline is connected to the energy storage pipeline by the second quick connector 19, the first connection pipeline is connected to the control pipeline 18 by the third quick connector 20, and the first connection pipeline is provided with the sixth stop valve 10. One end of the first connection pipeline is connected to the energy storage pipeline through the second quick connector 19, and the other end of the first connection pipeline is connected to the control pipeline 18 through the third quick connector 20.

[0075] The second quick connector 19 comprises a second male head and a second female head, and the one end of the first connecting pipeline and the second end of the energy storage pipeline are respectively provided with the second male head and the second female head.

[0076] Further, the first quick connector 21, the second quick connector 19 and the third quick connector 20 can be the same, that is, the first male head, the second male head and the third male head are the same, and the first female head, the second female head and the third female head are the same, so as to improve the versatility of the control module and the energy storage module.

[0077] In the embodiment of the present application, the working process of the control system of the blowout preventer is as follows:

[0078] In the initial state, the hydraulic oil in the first oil tank 6 passes through the oil suction pipeline, the energy storage pipeline and the second branch to the energy accumulator 9; in the working state, the hydraulic oil in the energy accumulator 9 passes through the second branch, the energy storage pipeline, the first connecting pipeline, the control pipeline 18, the first branch to the control valve 15, so as to control the opening of the blowout preventer; in the disassembly state, the hydraulic oil in the first branch, the control pipeline 18, the first connecting pipeline and the energy storage pipeline passes through the oil return pipeline to the first oil tank 6.

[0079] Specifically, in the initial state, after the oil suction pump 3 in the energy storage module is started, the filtered hydraulic oil in the first oil tank 6 can be input into the energy accumulator 9 through the first ball valve, and the oil suction pipeline, the oil return pipeline, the energy storage pipeline and the second branch are filled, so as to realize energy storage.

[0080] The sixth stop valve 10 is opened, the hydraulic oil enters the control pipeline 18 through the first connecting pipeline, and then enters each control valve 15 through the first branch after being depressurized by the pressure relief valve 13, so as to reach the standby state. In the working state, the control valve 15 is pulled to the corresponding switch position, so as to operate the opening and closing of the blowout preventer. At this time, the wellhead can be subjected to fracturing operation, and a plurality of control modules can control a plurality of wellheads to simultaneously perform fracturing operation, so that the blowout preventer for the plurality of wellheads can be provided with hydraulic control power with the smallest occupied area, the safety of the fracturing operation is effectively improved, and the safety production is facilitated.

[0081] After the fracturing operation is completed, the control system of the blowout preventer needs to be disassembled. In the disassembly state, the first stop valve and the sixth stop valve 10 are opened, and the oil return pump 7 is started, so as to suck the hydraulic oil in each pipeline and each branch back to the first oil tank 6, thereby avoiding the hydraulic oil from being spilled to the ground during disassembly, and reducing the pollution of the hydraulic oil to the ground.

[0082] In summary, in the control system of the blowout prevention equipment provided by the embodiments of the present application, at least one control module is connected with the energy storage module through the first connecting pipeline and connected with a group of blowout prevention equipment. Since the wellheads are distributed relatively dispersedly and in a large number during multi-well fracturing operation, the control module and the energy storage module in the embodiments of the present application are distributed, and can be respectively arranged at the required positions. The control module can be arranged near the wellhead of the fracturing operation, the control module is adjacent to the wellhead, so that the reaction time can be shortened and the misoperation can be reduced, and the energy storage module can be arranged at a position not hindering other structures, for example, a safe area. In addition, compared with the arrangement of a group of blowout preventers and their control systems at each wellhead, in the control system of the blowout prevention equipment in the embodiments of the present application, each control module can control a group of blowout prevention equipment, the number of the blowout prevention equipment can be adjusted by adjusting the number of the control modules, so as to ensure the safety of the multi-wellheads, and the energy storage module provides hydraulic oil for all the blowout prevention equipment, and the space occupied by the energy storage module is smaller, so that the space is saved, the fuel consumption and the overall fracturing operation cost are reduced, and the yield increase is facilitated.

[0083] The embodiments or implementations in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be mutually referred to.

[0084] Those skilled in the art should understand that, in the disclosure of the present application, the orientations or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the systems or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation on the present application.

[0085] In the description of the specification, the description referring to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A control system for a blowout prevention device, characterized in that, include: An energy storage module, at least one control module, and a first connecting pipeline; The control module includes a control pipeline. Along the first end to the second end of the control pipeline, a pressure relief valve and at least two first branches are sequentially arranged in the control pipeline. Each first branch is connected to a control valve. Multiple control valves control a group of blowout prevention equipment. The energy storage module includes a first oil tank, an oil suction line, an oil return line, and an energy storage line. The first ends of the oil suction line and the oil return line are both connected to the first oil tank, and the second ends of the oil suction line and the oil return line are both connected to the first end of the energy storage line. Along the first end to the second end of the energy storage line, a first switching valve and a second branch are sequentially provided, and the second branch is connected to the energy storage device. The two ends of the first connecting pipe are respectively connected to the first end of the control pipe and the second end of the energy storage pipe; In the initial state, the hydraulic oil in the first oil tank flows through the suction line, the energy storage line, and the second branch line to the energy storage device; in the working state, the hydraulic oil in the energy storage device flows through the second branch line, the energy storage line, the first connecting line, the control line, and the first branch line to the control valve to control the opening of the blowout prevention device; in the disassembled state, the hydraulic oil in the first branch line, the control line, the first connecting line, and the energy storage line flows through the return line to the first oil tank.

2. The control system for the blowout prevention equipment according to claim 1, characterized in that, The number of control modules is at least two, and at least two control modules are connected in series; the control system further includes a second connecting pipe, the two ends of which are respectively connected to the second end of the control pipe in the previous stage control module and the first end of the control pipe in the subsequent stage control module.

3. The control system for the blowout prevention equipment according to claim 2, characterized in that, The control pipeline and the second connecting pipeline are connected by a first quick-connect plug, and the second connecting pipeline is equipped with a first shut-off valve.

4. The control system for the blowout prevention equipment according to claim 1, characterized in that, The pressure-reducing relief valve is also connected in parallel with a first ball valve; And / or, a first pressure gauge and a third oil filter are sequentially provided between the first end of the control pipeline and the pressure reducing relief valve, and a second pressure gauge is also provided between the pressure reducing relief valve and the first branch.

5. The control system for the blowout prevention equipment according to any one of claims 1-4, characterized in that, Along the direction away from the first oil tank, the oil suction line is sequentially equipped with a second shut-off valve, a first oil filter, an oil suction pump, and a check valve, and the oil return line is sequentially equipped with a third shut-off valve and a oil return pump.

6. The control system for the blowout prevention equipment according to claim 5, characterized in that, An oil injection pipeline is provided between the first oil filter and the oil suction pump. The oil injection pipeline is connected to an external oil tank through a second oil filter and a fourth shut-off valve arranged in sequence. An oil drain line is provided between the oil suction pump and the check valve, and the oil drain line is connected to the second oil tank through the fifth shut-off valve.

7. The control system for the blowout prevention equipment according to claim 5, characterized in that, The number of oil suction pipes is at least two, and at least two oil suction pipes are connected in parallel.

8. The control system for the blowout prevention equipment according to any one of claims 1-4, characterized in that, The energy storage module also includes a skid-mounted body, and the first oil tank, the oil suction line, the oil return line, the energy storage line, the second branch line, the first switching valve and the energy storage device are all mounted on the skid-mounted body; The control module also includes a main frame, on which the control pipeline, the pressure reducing overflow valve, at least two first branches and the control valve are all mounted.

9. The control system for the blowout prevention equipment according to any one of claims 1-4, characterized in that, A second switching valve is provided on the second branch, and both the first switching valve and the second switching valve include a second ball valve connected in parallel.

10. The control system for the blowout prevention equipment according to any one of claims 1-4, characterized in that, The first connecting pipe is connected to the energy storage pipe via a second quick-connect plug, and the first connecting pipe is connected to the control pipe via a third quick-connect plug. The first connecting pipe is equipped with a sixth shut-off valve.

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