A wellhead safety control system

Abstract

The utility model belongs to control technical field discloses a wellhead safety control system, including hydraulic station, the hydraulic station connects first pressure regulating valve, second pressure regulating valve and third pressure regulating valve, second pressure regulating valve connects first check valve and second check valve, first check valve connects first high pressure hydraulic control tee bend valve, first high pressure hydraulic control tee bend valve connects export one, first high pressure hydraulic control tee bend valve with export one between being equipped with first pressure sensor, second check valve connects second high pressure hydraulic control tee bend valve, second high pressure hydraulic control tee bend valve connects export two, second high pressure hydraulic control tee bend valve with export two between being equipped with second pressure sensor. The utility model has the beneficial effect: in addition to traditional on -the -spot control function, still can receive the signal that well site central control room sends, realizes partial remote control function, and can realize and well site other control system linkage control, satisfy well site intelligent, process control demand.

Description

Technical Field

[0001] This utility model relates to the field of control technology, and in particular to a wellhead safety control system. Background Technology

[0002] Wellhead control panels play a crucial role in the safe production of high-pressure, high-yield, and high-risk oil and gas wells in onshore deserts and offshore platform oil and gas wells. They effectively prevent or reduce oil and gas well accidents and hydrocarbon emissions. The wellhead safety control system is one of the essential control systems for safe production in oilfields.

[0003] Therefore, it is necessary to provide a wellhead safety control system that, in addition to traditional local control functions, can also receive signals sent from the well site control room, realize some remote control functions, and can achieve linkage control with other control systems in the well site to meet the intelligent and process-oriented control requirements of the well site. Utility Model Content

[0004] This utility model discloses a wellhead safety control system, which can effectively solve the technical problems involved in the background art.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A wellhead safety control system includes a hydraulic station connected to a first pressure regulating valve, a second pressure regulating valve, and a third pressure regulating valve. The second pressure regulating valve is connected to a first check valve and a second check valve. The first check valve is connected to a first high-pressure hydraulically controlled three-way valve, which is connected to an outlet. A first pressure sensor is provided between the first high-pressure hydraulically controlled three-way valve and the outlet. The second check valve is connected to a second high-pressure hydraulically controlled three-way valve, which is connected to an outlet. A second pressure sensor is provided between the second high-pressure hydraulically controlled three-way valve and the outlet. The third pressure regulating valve is connected to a third check valve. The valve is configured such that the third check valve is connected to the third high-pressure hydraulic control three-way valve, the third high-pressure hydraulic control three-way valve is connected to outlet three, and a third pressure sensor is provided between the third high-pressure hydraulic control three-way valve and outlet three; the first pressure regulating valve is connected to the first two-position three-way solenoid valve, the first two-position three-way solenoid valve is connected to the inlet of the relay valve, the outlet of the relay valve is connected to the inlet of the third high-pressure hydraulic control three-way valve and the second two-position three-way solenoid valve, the outlet of the second two-position three-way solenoid valve is connected to the inlet of the second high-pressure hydraulic control three-way valve and the third two-position three-way solenoid valve, and the outlet of the third two-position three-way solenoid valve is connected to the first high-pressure hydraulic control three-way valve.

[0007] This invention relates to a wellhead safety control system capable of controlling three safety valves on the production tree of an oil and gas well: a surface wing safety valve, a surface main safety valve, and a downhole safety valve. The wellhead safety control system includes an electrical control module, enabling not only local manual control of the safety valves' opening and closing but also partial remote control operations. Its overall functionality is more advanced and comprehensive than traditional wellhead safety control systems.

[0008] As a preferred improvement of this utility model, the relay valve is a manual hydraulic relay valve.

[0009] As a preferred improvement of this utility model: a first pressure gauge and a first safety relief valve are provided between the first high-pressure hydraulic control three-way valve and the outlet.

[0010] As a preferred improvement of this utility model: a second pressure gauge and a second safety relief valve are provided between the second high-pressure hydraulic control three-way valve and the second outlet.

[0011] As a preferred improvement of this utility model: a third pressure gauge and a third safety relief valve are provided between the third high-pressure hydraulic control three-way valve and the third outlet.

[0012] As a preferred improvement of this utility model: the first outlet is connected to the actuator of the wing safety valve of the wellhead, the second outlet is connected to the actuator of the main safety valve of the wellhead, and the third outlet is connected to the actuator of the downhole safety valve of the wellhead.

[0013] As a preferred improvement of this utility model, the safety control system further includes a PLC, which is connected to the first two-position three-way solenoid valve, the second two-position three-way solenoid valve, and the third two-position three-way solenoid valve.

[0014] As a preferred improvement of this utility model, the relay valve is manually reset.

[0015] As a preferred improvement of this utility model, the safety control system further includes a PLC, which is connected to the first pressure sensor, the second pressure sensor and the third pressure sensor.

[0016] The beneficial effects of this utility model are as follows:

[0017] A wellhead safety control system is provided, which can open and close the three safety valves of the wellhead production tree. Compared with the previous wellhead safety control system, in addition to the traditional local control function, this system can also receive signals sent by the well site control room to realize some remote control functions, and can realize linkage control with other control systems in the well site to meet the intelligent and process-oriented control needs of the well site. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0019] Figure 1 This is a schematic diagram of a wellhead safety control system according to the present invention.

[0020] In the diagram: 1-Hydraulic station, 21-First pressure regulating valve, 22-Second pressure regulating valve, 23-Third pressure regulating valve, 31-First two-position three-way solenoid valve, 32-Second two-position three-way solenoid valve, 33-Third two-position three-way solenoid valve, 4-Relay valve, 51-First check valve, 52-Second check valve, 53-Third check valve, 61-First high-pressure hydraulic control three-way valve, 62-Second high-pressure hydraulic control three-way valve, 63-Third high-pressure hydraulic control three-way valve, 71-First pressure gauge, 72-Second pressure gauge, 73-Third pressure gauge, 81-First pressure sensor, 82-Second pressure sensor, 83-Third pressure sensor, 91-First safety relief valve, 92-Second safety relief valve, 93-Third safety relief valve. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0023] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0026] Please see Figure 1As shown, this utility model provides a wellhead safety control system, including a hydraulic station 1. The hydraulic station 1 is connected to a first pressure regulating valve 21, a second pressure regulating valve 22, and a third pressure regulating valve 23. The second pressure regulating valve 22 is connected to a first check valve 51 and a second check valve 52. The first check valve 51 is connected to a first high-pressure hydraulic control three-way valve 61, which is connected to outlet one. A first pressure sensor 81, a first pressure gauge 71, and a first safety relief valve 91 are provided between the first high-pressure hydraulic control three-way valve 61 and outlet one. The second check valve 52 is connected to a second high-pressure hydraulic control three-way valve 62, which is connected to outlet two. A second pressure sensor 82, a second pressure gauge 72, and a second safety relief valve 92 are provided between the second high-pressure hydraulic control three-way valve 62 and outlet two. The third pressure regulating valve 23... Pressure valve 23 is connected to a third check valve 53, which in turn is connected to a third high-pressure hydraulic control three-way valve 63. The third high-pressure hydraulic control three-way valve 63 is connected to outlet three. A third pressure sensor 83, a third pressure gauge 73, and a third safety relief valve 93 are provided between the third high-pressure hydraulic control three-way valve 63 and outlet three. The first pressure regulating valve 21 is connected to a first two-position three-way solenoid valve 31, which is connected to the inlet of relay valve 4. The outlet of relay valve 4 is connected to the inlet of the third high-pressure hydraulic control three-way valve 63 and the second two-position three-way solenoid valve 32. The outlet of the second two-position three-way solenoid valve 32 is connected to the inlet of the second high-pressure hydraulic control three-way valve 62 and the third two-position three-way solenoid valve 33. The outlet of the third two-position three-way solenoid valve 33 is connected to the first high-pressure hydraulic control three-way valve 61. All components are connected by pipelines. In this embodiment, relay valve 4 is a manual hydraulic control relay valve, and it is manually reset. Outlet one is connected to the actuator of the wing safety valve of the Christmas tree, outlet two is connected to the actuator of the main safety valve of the Christmas tree, and outlet three is connected to the actuator of the downhole safety valve of the Christmas tree. The safety control system also includes a PLC, which is connected to the first two-position three-way solenoid valve 31, the second two-position three-way solenoid valve 32, and the third two-position three-way solenoid valve 33, and is also connected to the first pressure sensor 81, the second pressure sensor 82, and the third pressure sensor 83.

[0027] Specifically, a wellhead safety control system is disclosed. Its characteristic is that a hydraulic station outputs high-pressure hydraulic medium. After the pressure of the hydraulic station's output medium is reduced by a pressure regulating valve, a pilot hydraulic control circuit and a safety valve hydraulic control output circuit are obtained. By controlling the pilot hydraulic control circuit, the pressure supply and depressurization of the safety valve hydraulic control output circuit are controlled, thereby realizing the opening and closing control of the wellhead safety valve. The safety control system includes a hydraulic station, a pressure regulating valve, a two-position three-way solenoid valve, a manual hydraulic control relay valve, a check valve, a high-pressure hydraulic control three-way valve, a pressure gauge, a pressure sensor, and a safety relief valve. The hydraulic station provides the high-pressure hydraulic medium required by the control system. The pressure reducing valve regulates the pressure of the high-pressure medium output from the hydraulic station to obtain the required hydraulic control circuit. The two-position three-way solenoid valve controls the supply and depressurization of the pilot pressure of each high-pressure hydraulic control valve (i.e., controls the opening and closing of the high-pressure hydraulic control valve). The manual hydraulic control relay valve controls the opening and closing of the high-pressure hydraulic control valve in the downhole safety valve hydraulic control circuit. The check valve maintains the pressure of each circuit to prevent operation of other circuits from affecting this circuit. The high-pressure hydraulic control valve is used to control the pressure supply and release of the hydraulic control circuit. When there is pilot pressure at the pilot end of the high-pressure hydraulic control valve, the valve opens and the output pressure is established; when the pressure at the pilot end of the high-pressure hydraulic control valve is released, the valve closes and the output pressure is released. The pressure gauge is used to indicate the output pressure value of each hydraulic control circuit. The pressure sensor is used to indicate the output pressure value of each hydraulic control circuit, and the pressure value signal can be transmitted to the well site control room to realize remote monitoring of the hydraulic control circuit pressure value. The safety relief valve is used to automatically release excess pressure when each hydraulic control circuit is overpressured, to prevent abnormal pressure rise in the circuit due to direct sunlight or other reasons, which could lead to overpressure damage to the system circuit. It should be further noted that any other components used to achieve the above effects should fall within the inventive concept of this utility model and should be protected within the scope of this utility model.

[0028] Working principle: A pressure reducing valve is installed at the outlet of the hydraulic station to set the required pressure for each hydraulic control circuit. The low-pressure pilot circuit is used to control the high-pressure hydraulic control output circuit to realize the opening and closing operation of the safety valve.

[0029] The specific operating procedure of the wellhead safety control system is as follows: After connecting all the safety valves to be controlled, the hydraulic station 1 can be started to supply high-pressure hydraulic medium. The pressure regulating valve is adjusted according to the required pressure of each hydraulic control circuit to obtain the pressure for each hydraulic control circuit. After the pressure of each hydraulic control circuit is established, the opening or closing operation of each safety valve hydraulic control circuit is performed by controlling the pilot circuit two-position three-way solenoid valve and the manual hydraulic control relay valve. After each safety valve hydraulic control circuit is opened, the pressure gauge and pressure sensor can detect and display the pressure value of each hydraulic control circuit. The safety valves are generally kept in the open state. When it is necessary to close the safety valves, the pressure of each safety valve hydraulic control circuit is depressurized to achieve closure. At this time, the pressure gauge and pressure sensor values ​​return to zero.

[0030] This invention utilizes a two-position three-way solenoid valve for the on / off operation of the high-pressure hydraulic control valve. Compared to traditional wellhead safety control systems that use manual relay valves, this system can simultaneously meet both local manual control and remote communication control functions. The sequence of actions of the two-position three-way solenoid valve can be controlled via a PLC program to achieve the sequential opening or closing of various safety valves. The high-pressure hydraulic control valve in the downhole safety valve hydraulic control circuit is jointly controlled by a two-position three-way solenoid valve and a manual hydraulic control relay valve. After the downhole safety valve is closed, the manual relay valve must be manually reset locally before the downhole safety valve can be reopened, preventing accidental reopening of the downhole safety valve by remote operators.

[0031] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A wellhead safety control system characterized by: Includes a hydraulic station (1), which is connected to a first pressure regulating valve (21), a second pressure regulating valve (22) and a third pressure regulating valve (23). The second pressure regulating valve (22) is connected to a first check valve (51) and a second check valve (52). The first check valve (51) is connected to the first high-pressure hydraulic control three-way valve (61), the first high-pressure hydraulic control three-way valve (61) is connected to outlet one, and a first pressure sensor (81) is provided between the first high-pressure hydraulic control three-way valve (61) and outlet one. The second one-way valve (52) is connected to the second high-pressure hydraulic control three-way valve (62), the second high-pressure hydraulic control three-way valve (62) is connected to outlet two, and a second pressure sensor (82) is provided between the second high-pressure hydraulic control three-way valve (62) and outlet two. The third pressure regulating valve (23) is connected to the third check valve (53), the third check valve (53) is connected to the third high-pressure hydraulic control three-way valve (63), the third high-pressure hydraulic control three-way valve (63) is connected to outlet three, and a third pressure sensor (83) is provided between the third high-pressure hydraulic control three-way valve (63) and outlet three. The first pressure regulating valve (21) is connected to the first two-position three-way solenoid valve (31), the first two-position three-way solenoid valve (31) is connected to the inlet of the relay valve (4), the outlet of the relay valve (4) is connected to the inlet of the third high-pressure hydraulic control three-way valve (63) and the second two-position three-way solenoid valve (32), the outlet of the second two-position three-way solenoid valve (32) is connected to the inlet of the second high-pressure hydraulic control three-way valve (62) and the third two-position three-way solenoid valve (33), and the outlet of the third two-position three-way solenoid valve (33) is connected to the first high-pressure hydraulic control three-way valve (61).

2. The wellhead safety control system according to claim 1, characterized in that: The relay valve (4) is a manual hydraulic relay valve.

3. A wellhead safety control system according to claim 1, characterized in that: A first pressure gauge (71) and a first safety relief valve (91) are provided between the first high-pressure hydraulic control three-way valve (61) and the outlet.

4. A wellhead safety control system according to claim 1, characterized in that: A second pressure gauge (72) and a second safety relief valve (92) are provided between the second high-pressure hydraulic control three-way valve (62) and the second outlet.

5. A wellhead safety control system according to claim 1, characterized in that: A third pressure gauge (73) and a third safety relief valve (93) are provided between the third high-pressure hydraulic control three-way valve (63) and the third outlet.

6. A wellhead safety control system according to claim 1, characterized in that: Outlet 1 is connected to the actuator of the wing safety valve of the wellhead, outlet 2 is connected to the actuator of the main safety valve of the wellhead, and outlet 3 is connected to the actuator of the downhole safety valve of the wellhead.

7. A wellhead safety control system according to claim 1, characterized in that: The safety control system also includes a PLC, which is connected to the first two-position three-way solenoid valve (31), the second two-position three-way solenoid valve (32), and the third two-position three-way solenoid valve (33).

8. A wellhead safety control system according to claim 1, characterized in that: The relay valve (4) is manually reset.

9. A wellhead safety control system according to claim 1, characterized in that: The safety control system also includes a PLC, which is connected to the first pressure sensor (81), the second pressure sensor (82), and the third pressure sensor (83).

Images