Multifunctional lower blowout preventer valve assembly mechanism and control system therefor

Abstract

A multifunctional lower blowout preventer valve assembly mechanism, belonging to the technical field of offshore oil engineering, and comprising a lower blowout preventer valve assembly base (800), a hydraulic connector (300) being fixedly connected to the lower blowout preventer valve assembly base. A flexible joint (200) is fixedly connected to the hydraulic connector, the end of the flexible joint away from the hydraulic connector being fixedly communicated with a blowout preventer valve pipe joint (100). The lower blowout preventer valve assembly base is fixedly connected to an underwater control unit (600), the underwater control unit is connected to a hydraulic oil circuit. The hydraulic oil circuit is connected to an accumulator unit (500), the accumulator unit being communicated with the hydraulic oil circuit by means of an accumulator hydraulic pipe. The hydraulic oil circuit is communicated with the hydraulic connector, such that an overwater control unit controls the locking or separation of the hydraulic connector to or from an external mechanism. Also disclosed is a multifunctional lower blowout preventer valve assembly mechanism control system. The multifunctional lower blowout preventer valve assembly mechanism achieves redundancy for injection of chemical agents in the lower blowout preventer valve assembly, and redundancy for locking and disconnection of the hydraulic connector.

Description

Multifunctional lower blowout preventer assembly mechanism and control system thereof TECHNICAL FIELD

[0001] The present application belongs to the technical field of offshore oil engineering, and particularly relates to a multifunctional lower blowout preventer assembly mechanism and control system thereof. BACKGROUND

[0002] With the increasing development of offshore oil and gas resources, more and more subsea wells are put into use, and well maintenance and production increase become an important operation task. The traditional well intervention operation is completed through a semi-submersible platform, which has the disadvantages of high operation cost and low efficiency.

[0003] A new type of well intervention operation can be completed through a special work ship, and a light intervention operation is completed by relying on light intervention equipment, without the need to deploy a riser, thereby greatly reducing the operation cost. However, there is no lower blowout preventer assembly mechanism and control system matched with the light intervention equipment in the existing technology.

[0004] Therefore, it is urgent to design a multifunctional lower blowout preventer assembly mechanism and control system to control the blowout preventer structure of the light intervention equipment, thereby solving the problems of high operation cost and low efficiency of the traditional well intervention operation. SUMMARY

[0005] To solve the problems of high operation cost and low efficiency of the traditional well intervention operation mentioned in the background, a multifunctional lower blowout preventer assembly mechanism and control system are provided to solve the above problems.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of the multifunctional lower blowout preventer assembly mechanism and control system of the present application is as follows:

[0007] A multifunctional lower blowout preventer assembly mechanism comprises a lower blowout preventer assembly base, a hydraulic connector fixedly connected to the lower blowout preventer assembly base, a flexible joint fixedly connected to the hydraulic connector, and a blowout preventer pipe joint fixedly connected to one end of the flexible joint away from the hydraulic connector, so that the blowout preventer pipe joint can be angle-compensated through the flexible joint, and the blowout preventer pipe joint can be connected to other mechanisms through the hydraulic connector.

[0008] A water control unit is fixedly connected to the lower blowout preventer assembly base, a hydraulic oil circuit is connected to the water control unit, an accumulator unit is connected to the hydraulic oil circuit, the accumulator unit is communicated with the hydraulic oil circuit through an accumulator hydraulic pipe, so as to provide hydraulic pressure for the water control unit, thereby realizing hydraulic control of the water control unit, and the hydraulic oil circuit is communicated with the hydraulic connector, so as to control the locking or separation of the hydraulic connector and the external mechanism by the water control unit.

[0009] The lower blowout preventer assembly base is fixedly connected with a control panel, one end of the control panel is connected with a chemical agent unit, and the end of the control panel away from the chemical agent unit is communicated with the hydraulic oil circuit, so that the control panel and the underwater control unit can control the injection of the chemical agent.

[0010] Further, the hydraulic connector comprises a connector shell fixedly connected with the lower blowout preventer assembly base, and a connector body threadedly connected with the connector shell, one end of the connector body is connected with the flexible joint flange, the outside of the end of the connector body away from the flexible joint is provided with a locking claw, the connector body is connected with the external mechanism through the locking claw, a main release oil cavity, a secondary release oil cavity and a locking oil cavity are arranged between the locking claw and the connector shell, the clamping or opening of the locking claw is controlled by adjusting the hydraulic pressure in the main release oil cavity, the secondary release oil cavity and the locking oil cavity, and the main release oil cavity, the secondary release oil cavity and the locking oil cavity are communicated with the hydraulic oil circuit, so that the underwater control unit controls the locking or separation of the hydraulic connector and the external mechanism.

[0011] Further, the flexible joint comprises a flexible joint shell, the flexible joint is connected with the blowout preventer pipeline joint flange through the flexible joint shell, a mandrel is connected with the end of the flexible joint shell away from the blowout preventer pipeline joint, a small rubber ring grommet, a small rubber ring and a small rubber ring pressing ring are sequentially arranged on the end of the mandrel close to the flexible joint shell, a large rubber ring and a large rubber ring grommet are sequentially arranged on the outside of the end of the mandrel close to the flexible joint shell, and the large rubber ring grommet is threadedly connected with the flexible joint shell, so as to fix the large rubber ring and the small rubber ring, thereby sealing the flexible joint shell and the mandrel.

[0012] Further, the underwater control unit comprises a low-pressure valve group and a high-pressure valve group, one end of the low-pressure valve group and the high-pressure valve group is connected with the hydraulic oil circuit, and the end of the low-pressure valve group and the high-pressure valve group away from the hydraulic oil circuit is connected with the accumulator hydraulic pipeline, so that the underwater control unit controls the hydraulic pressure through the low-pressure valve group and the high-pressure valve group.

[0013] Further, the chemical agent unit comprises a chemical agent storage tank, the chemical agent storage tank is arranged on the lower blowout preventer assembly base, a chemical agent pipeline is connected with the chemical agent storage tank, the end of the chemical agent pipeline away from the chemical agent storage tank is communicated with the pipeline formed by the hydraulic connector, the flexible joint and the blowout preventer pipeline joint, and a chemical agent injection pump is connected with the chemical agent pipeline, so as to provide fluid power for the agent in the chemical agent pipeline.

[0014] Further, the control panel is provided with a first chemical agent injection valve, the first chemical agent injection valve is communicated with the chemical agent pipeline, so that the control panel controls the injection of the chemical agent, a hydraulic control joint is arranged on the first chemical agent injection valve, the hydraulic control joint is connected with the hydraulic oil circuit, so that the underwater control unit controls the opening and closing of the first chemical agent injection valve.

[0015] Further, the operating panel is provided with an emergency release ROV interface, which is communicated with the main release oil cavity and the locking oil cavity respectively, so as to provide hydraulic connectors for emergency separation from external mechanisms.

[0016] Another object of the present application is to provide a multifunctional lower blowout preventer assembly mechanism control system for controlling the multifunctional lower blowout preventer assembly mechanism, which comprises:

[0017] A communication module is connected with the central processor and used for receiving control signals from a surface master control station.

[0018] A central processing module is connected with the communication module and used for receiving control signals of the communication module and outputting control commands.

[0019] A drive module is connected with the central processing module and used for receiving control commands of the central drive module and outputting execution commands.

[0020] A valve group module is connected with the drive module, executes commands outputted by the drive module and adjusts each valve on the valve group.

[0021] An execution module is connected with the valve group module and executes corresponding commands through different valve groups.

[0022] Further, the central processing module receives and outputs signals through the central processor.

[0023] The drive module receives and outputs signals through the relay drive board.

[0024] The valve group module comprises a low-pressure valve group, a high-pressure valve group and an accumulator unit, the low-pressure valve group comprises an electrically controlled low-pressure valve group and an electrically controlled low-pressure pilot valve group, the electrically controlled low-pressure valve group and the electrically controlled low-pressure pilot valve group are connected with the accumulator unit, the electrically controlled low-pressure pilot valve group is further connected with the high-pressure valve group, the high-pressure valve group is connected with the accumulator unit, and hydraulic control is realized through transposition of the low-pressure valve group.

[0025] The execution module comprises a first chemical injection valve connected with the low-pressure valve group and a hydraulic connector connected with the high-pressure valve group.

[0026] Further, a standby communication module is further included, which is connected with a standby central processor; the standby central processor is connected with a standby relay drive board, the standby relay drive board is connected with a standby low-pressure valve group, the standby low-pressure valve group is connected with a standby first chemical injection valve,

[0027] The standby low-pressure valve group includes a standby electric control low-pressure valve group and a standby electric control low-pressure pilot valve group, the standby electric control low-pressure valve group and the standby electric control low-pressure pilot valve group are connected with the standby accumulator unit, the standby electric control low-pressure pilot valve group is further connected with a standby high-pressure valve group, the standby high-pressure valve group is connected with the standby accumulator unit, and the standby high-pressure valve group is connected with the hydraulic connector to form a redundant control system.

[0028] The multifunctional lower blowout preventer assembly mechanism and the control system thereof have the following advantages:

[0029] The multifunctional lower blowout preventer assembly mechanism and the control system thereof have the following advantages:

[0030] The multifunctional lower blowout preventer assembly mechanism and the control system thereof have the following advantages: BRIEF DESCRIPTION OF DRAWINGS

[0031] Fig. 1 is a schematic diagram of the multifunctional lower blowout preventer assembly mechanism of the present application;

[0032] Fig. 2 is a schematic diagram of the multifunctional lower blowout preventer assembly mechanism of the present application;

[0033] Fig. 3 is a structural diagram of the control system of the multifunctional lower blowout preventer assembly mechanism of the present application;

[0034] Fig. 4 is a specific structural diagram of the control system of the multifunctional lower blowout preventer assembly mechanism of the present application;

[0035] Fig. 5 is a structural diagram of the redundant control system of the multifunctional lower blowout preventer assembly mechanism of the present application.

[0036] Marked description in the figure: 100, blowout preventer pipeline joint; 200, flexible joint; 300, hydraulic connector; 400, chemical unit; 500, accumulator unit; 600, underwater control unit; 700, operating panel; 800, blowout preventer assembly base; 1, blowout preventer pipeline end; 2, lock block; 3, octagonal sealing washer; 4, inner hexagonal locking bolt; 5, bottom connecting flange; 6, flexible joint shell; 7, large rubber ring pad ring; 8, large rubber ring; 9, mandrel; 10, small rubber ring pad ring; 11, small rubber ring; 12, small rubber ring pad ring compression ring; 13, small rubber ring compression ring; 14, connector body; 15, connector shell; 16, release ring; 17, locking ring; 18, locking sleeve; 19, locking ring limiting ring; 20, locking ring limiting fixed ring; 21, locking jaw; 22, locking oil cavity; 23, main release oil cavity; 24, auxiliary release oil cavity; 25, chemical storage tank; 26, chemical storage tank base; 27, chemical injection pump; 28, accumulator; 29, bracket; 30, front panel; 31, first chemical injection valve; 32, second chemical injection valve; 33, emergency release ROV interface; 34, chemical pipeline; 35, accumulator hydraulic pipeline; 36, external pipeline; 37, hydraulic control joint. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the present application.

[0038] Those skilled in the art can understand that although some of the embodiments herein include certain features rather than other features included in other embodiments, the combination of features of different embodiments means to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0039] The multifunctional blowout preventer assembly mechanism and its control system of the present application are described below with reference to FIGS. 1 to 5.

[0040] There is no blowout preventer assembly mechanism and its control system matching the light intervention equipment in the prior art, and it is difficult to solve the problems of high operation cost and low efficiency of traditional oil well intervention operation

[0041] Therefore, the application provides a multifunctional lower blowout preventer assembly mechanism, as shown in Figures 1 and 2, which comprises a lower blowout preventer assembly base 800, a hydraulic connector 300 fixedly connected to the lower blowout preventer assembly base 800, a flexible joint 200 fixedly connected to the hydraulic connector 300, and a blowout preventer pipe joint 100 fixedly connected to the end of the flexible joint 200 away from the hydraulic connector 300, so that the blowout preventer pipe joint 100 is angle-compensated through the flexible joint 200, and the blowout preventer pipe joint 100 is connected to other mechanisms through the hydraulic connector 300; a subsea control unit 600 is fixedly connected to the lower blowout preventer assembly base 800, a hydraulic oil circuit is connected to the subsea control unit 600, and an accumulator unit 500 is connected to the hydraulic oil circuit, so that the subsea control unit 600 is provided with hydraulic pressure through the accumulator hydraulic circuit, and then the subsea control unit 600 is controlled by hydraulic pressure, and the hydraulic oil circuit is communicated with the hydraulic connector 300, so that the subsea control unit 600 controls the locking or separation of the hydraulic connector 300 and the external mechanism; a control panel 700 is fixedly connected to the lower blowout preventer assembly base 800, and a chemical unit 400 is connected to one end of the control panel 700, and the end of the control panel 700 away from the chemical unit 400 is communicated with the hydraulic oil circuit, so that the control panel 700 and the subsea control unit 600 can both control the injection of chemicals.

[0042] As preferred, as shown in Figure 2, the blowout preventer pipe joint 100 comprises a blowout preventer pipe terminal 1, a locking block 2, an octagonal sealing washer 3, an inner hexagonal locking bolt 4, and a bottom connecting flange 5. The blowout preventer pipe terminal 1 and the bottom connecting flange 5 are coaxially aligned, and the locking is completed through the locking block 2, the inner hexagonal locking bolt 4 and the locking block 2 are installed on the side of the bottom connecting flange 5 through threaded holes, and the upper octagonal sealing washer 3 is installed in the sealing groove of the blowout preventer pipe terminal 1 and the bottom connecting flange 5.

[0043] The hydraulic connector 300 comprises a connector shell 15 fixedly connected to the lower blowout preventer assembly base 800, a connector body 14 threadedly connected to the connector shell 15, one end of the connector body 14 flange-connected to the flexible joint 200, a locking jaw 21 provided on the outer side of the end of the connector body 14 away from the flexible joint 200, the connector body 14 connected to the external mechanism through the locking jaw 21, a main release oil cavity 23, a secondary release oil cavity 24, and a locking oil cavity 22 provided between the locking jaw 21 and the connector shell 15, the clamping or opening of the locking jaw 21 controlled by adjusting the hydraulic pressure in the main release oil cavity 23, the secondary release oil cavity 24, and the locking oil cavity 22, and the main release oil cavity 23, the secondary release oil cavity 24, and the locking oil cavity 22 all communicated with the hydraulic oil circuit, so that the subsea control unit 600 controls the locking or separation of the hydraulic connector 300 and the external mechanism.

[0044] Specifically, the hydraulic connector 300 comprises a connector body 14, a connector shell 15, a release ring 16, a locking ring 17, a locking sleeve 18, a locking ring limiting ring 19, a locking ring limiting fixing ring 20, and locking claws 21 which are uniformly distributed around the connector body 14, the outer side of the locking claws 21 being tangent to the locking sleeve 18, a Y-shaped sealing ring being installed at the contact position of the locking sleeve 18 and the connector shell 15, the locking ring 17 being fixed at the bottom of the locking sleeve 18 through the locking ring limiting ring 19 and the locking ring limiting fixing ring 20, a Y-shaped sealing ring being installed at the contact position of the locking ring 17 and the locking sleeve 18, a Y-shaped sealing ring being installed at the contact position of the outer side of the locking ring 17 and the connector shell 15, the upper part of the locking ring 17 being a locking oil cavity 22, a hydraulic oil circuit being connected to the locking oil cavity 22, the release ring 16 being sleeved outside the locking sleeve 18 and being sealed through a Y-shaped sealing ring, the outer side of the release ring 16 being tangent to the inner side of the connector shell 15 and being sealed through a Y-shaped sealing ring, the upper part of the release ring 16 being a main release oil cavity 23, the main release oil cavity 23 being connected to the hydraulic oil circuit, the lower part of the release ring 16 being a secondary release oil cavity 24, the hydraulic oil circuit being connected to the secondary release oil cavity 24, the connector body 14 being connected to the connector shell 15 through bolts, a Y-shaped sealing ring being installed at the contact position of the connector shell 15 and the locking sleeve 18, and a VX sealing ring being installed at the connection position of the connector body 14 and an external mechanism.

[0045] The flexible joint 200 comprises a flexible joint shell 6, the flexible joint 200 being connected to the blowout preventer pipe joint 100 through the flange of the flexible joint shell 6, a mandrel 9 being connected to the end of the flexible joint shell 6 away from the blowout preventer pipe joint 100, a small rubber ring grommet 10, a small rubber ring 11, and a small rubber ring pressing ring 13 being sequentially arranged at the end of the mandrel 9 close to the flexible joint shell 6, a large rubber ring 8 and a large rubber ring grommet 7 being sequentially arranged at the outer side of the end of the mandrel 9 close to the flexible joint shell 6, the large rubber ring grommet 7 being threadedly connected to the flexible joint shell 6 to fix the large rubber ring 8 and the small rubber ring 11, thereby sealing the flexible joint shell 6 and the mandrel 9.

[0046] Specifically, the flexible joint 200 comprises a flexible joint shell 6, a large rubber ring grommet 7, a large rubber ring 8, a mandrel 9, a small rubber ring grommet 10, a small rubber ring 11, a small rubber ring grommet compression ring 12 and a small rubber ring compression ring 13. The small rubber ring grommet 10 is installed in the groove at the top end of the mandrel 9, and is compressed by the small rubber ring grommet compression ring 12, which is bolted to the top end of the mandrel 9. The small rubber ring 11 is connected to the small rubber ring grommet 10 and the small rubber ring compression ring 13 by special adhesive. The large rubber ring 8 is connected to the outside of the top end of the mandrel 9 and the inside of the large rubber ring grommet 7 by special adhesive. The flexible joint shell 6 is connected to the large rubber ring grommet 7 by stud nut after compressing the small rubber ring compression ring 13. The flexible joint shell 6 is connected to the flange of the blowout preventer pipe joint 100 by bolts. The octagonal sealing grommet 3 is located in the sealing groove between the top connecting part of the flexible joint shell 6 and the blowout preventer pipe joint 100.

[0047] The underwater control unit 600 comprises a low-pressure valve group and a high-pressure valve group. One end of the low-pressure valve group and the high-pressure valve group is connected to the hydraulic oil circuit, and the other end of the low-pressure valve group and the high-pressure valve group is connected to the accumulator hydraulic circuit 35, so that the underwater control unit 600 controls the hydraulic pressure through the low-pressure valve group and the high-pressure valve group.

[0048] The chemical agent unit 400 comprises a chemical agent storage tank 25, which is located on the lower blowout preventer assembly base 800. The chemical agent storage tank 25 is connected to the chemical agent circuit 34, the other end of which is in communication with the circuit formed by the hydraulic connector 300, the flexible joint 200 and the blowout preventer pipe joint 100. The chemical agent circuit 34 is connected to the chemical agent injection pump 27 to provide fluid power for the chemical agent in the chemical agent circuit 34.

[0049] Preferably, the lower blowout preventer assembly base 800 is fixedly connected to a chemical agent storage tank base 26, and the chemical agent storage tank 25 is seated on the chemical agent storage tank base 26.

[0050] The first chemical agent injection valve 31 is provided on the operating panel 700 and is in communication with the chemical agent circuit 34, so that the operating panel 700 controls the injection of the chemical agent. The first chemical agent injection valve is provided with a hydraulic control connector 37, which is connected to the hydraulic oil circuit, so that the underwater control unit 600 controls the opening and closing of the first chemical agent injection valve 31.

[0051] The emergency release ROV interface 33 is provided on the operating panel 700 and is in communication with the main release oil cavity 23 and the locking oil cavity 22, respectively, so that the hydraulic connector 300 can be separated from the external mechanism in an emergency.

[0052] As preferred, the bracket 29 is fixedly connected to the lower blowout preventer assembly base 800, and the bracket 29 is fixedly connected to the operating panel 700 to fix the operating panel 700 to the lower blowout preventer assembly base 800.

[0053] As preferred, the second chemical injection valve 32 is arranged on the operating panel 700, one end of the second chemical injection valve 32 is communicated with the chemical injection pipeline 34, and the other end is communicated with the foreign pipeline 36 to control the opening and closing of the foreign pipeline 36.

[0054] A multifunctional lower blowout preventer assembly mechanism control system, as shown in FIG. 4, comprises:

[0055] The communication module is connected with the central processing unit and is used to receive the control signal from the water surface master control station.

[0056] The central processing module is connected with the communication module and is used to receive the control signal of the communication module and output the control command.

[0057] The driving module is connected with the central processing module and is used to receive the control command of the central driving module and output the execution command.

[0058] The valve group module is connected with the driving module, executes the command output by the driving module, and adjusts each valve on the valve group.

[0059] The execution module is connected with the valve group module, executes the corresponding command through the combination of different valves.

[0060] As shown in FIG. 5, the central processing module receives and outputs the signal through the central processing unit; the driving module receives and outputs the signal through the relay driving board.

[0061] The valve group module comprises a low-pressure valve group, a high-pressure valve group, and an accumulator unit 500, the low-pressure valve group comprises an electrically controlled low-pressure valve group and an electrically controlled low-pressure pilot valve group, the electrically controlled low-pressure valve group and the electrically controlled low-pressure pilot valve group are connected with the accumulator unit 500, the electrically controlled low-pressure pilot valve group is further connected with the high-pressure valve group, the high-pressure valve group is connected with the accumulator unit, and the hydraulic control is realized through the transposition of the low-pressure valve group.

[0062] The execution module comprises a first chemical injection valve connected with the low-pressure valve group and a hydraulic connector 300 connected with the high-pressure valve group.

[0063] As preferred, the chemical agent unit 400 of the lower blowout preventer assembly, the accumulator unit 500, the first chemical injection valve 31, the second chemical injection valve 32 and the emergency release ROV interface 33 on the underwater control module and the operation panel 700 are all designed with double redundancy, so as to realize double redundancy of all functions of the lower blowout preventer assembly mechanism and the control system, and ensure the reliability of the intervention equipment during operation, so that, as shown in FIG. 6, the multifunctional lower blowout preventer assembly mechanism control system further comprises a backup communication module connected with a backup central processing unit; the backup central processing unit is connected with a backup relay drive board, the backup relay drive board is connected with a backup low-pressure valve group, the backup low-pressure valve group is connected with a backup first chemical injection valve,

[0064] The backup low-pressure valve group comprises a backup electrically-controlled low-pressure valve group and a backup electrically-controlled low-pressure pilot valve group, both of which are connected with the backup accumulator unit 500, and the backup electrically-controlled low-pressure pilot valve group is further connected with a backup high-pressure valve group, the backup high-pressure valve group is connected with the backup accumulator unit, and the backup high-pressure valve group is connected with the hydraulic connector 300, so as to form a redundant control system.

[0065] Chemical agent redundant injection of the lower blowout preventer assembly and other mechanisms: after the communication module of the control system receives the control signal from the surface master control station, the control signal is transmitted to the central processing unit, the central processing unit controls the relay drive board to control the low-pressure valve group to switch, after the electrically-controlled low-pressure valve group in the low-pressure valve group switches, the low-pressure hydraulic oil from the accumulator unit 500 is transmitted to the hydraulic control connector 37 of the first chemical injection valve 31 through the hydraulic oil path output interface via the hydraulic oil path, so as to control the first chemical injection valve 31 to open, and the chemical agent injection pump 27 injects the chemical agent in the chemical agent storage tank 25 into the lower blowout preventer assembly through the chemical agent pipeline 34, and in the same way, the control system controls the opening and closing of the second chemical injection valve 32 to complete the injection of the chemical agent in other required positions; in the case of hydraulic control failure, the first chemical injection valve 31 and the second chemical injection valve 32 can be opened by ROV mechanical rotation, so as to ensure the smooth progress of the chemical agent injection work.

[0066] Redundant locking and disconnecting of hydraulic connector 300: the communication module of the control system receives the control signal from the surface master control station, and then transmits the control signal to the central processor. The central processor controls the relay drive board to control the low-pressure valve group to switch. After the electrically controlled low-pressure pilot valve group in the low-pressure valve group switches, the output low-pressure hydraulic oil controls the high-pressure valve group to switch. After the high-pressure valve group switches, the high-pressure hydraulic oil from the accumulator unit 500 can be input into the locking oil chamber 22, the main release oil chamber 23 and the auxiliary release oil chamber 24 of the hydraulic connector 300 through the hydraulic oil path. When the high-pressure hydraulic oil is input into the locking oil chamber 22, the lower blowout preventer valve assembly can be connected with other equipment below. When the high-pressure hydraulic oil is input into the main release oil chamber 23, the lower blowout preventer valve assembly can be disconnected with other equipment below. When the high-pressure hydraulic oil is input into the auxiliary release oil chamber 24, the lower blowout preventer valve assembly can be redundantly released with other equipment below. When the high-pressure hydraulic oil is simultaneously input into the main release oil chamber 23 and the auxiliary release oil chamber 24, the lower blowout preventer valve assembly can be quickly and emergently disconnected to timely respond to unexpected situations. When the control system of the underwater control module fails to complete the locking and disconnecting operation of the hydraulic connector 300, the ROV can complete the redundant control of the hydraulic connector 300 through the emergency release ROV interface 33. The high-pressure hydraulic oil from the ROV can be injected into the main release oil chamber 23 through the emergency release ROV interface 33 to complete the release of the hydraulic connector 300, thereby disconnecting the lower blowout preventer valve assembly with other equipment below. When the high-pressure hydraulic oil from the ROV is injected into the locking oil chamber 22 to complete the locking of the hydraulic connector 300, the lower blowout preventer valve assembly is connected with other equipment below.

[0067] Control of key functions of other mechanisms above the lower blowout preventer valve assembly: the communication module of the control system receives the control signal from the surface master control station, and then transmits the control signal to the central processor. The central processor controls the relay drive board to control the low-pressure valve group to switch. After the electrically controlled low-pressure valve group in the low-pressure valve group switches, the low-pressure hydraulic oil from the accumulator unit 500 is transmitted to the other hydraulic control components above the lower blowout preventer valve assembly through the hydraulic oil path output interface and the hydraulic oil path, thereby realizing the control of the functions of other equipment above the lower blowout preventer valve assembly.

[0068] Increase the deflection of other components above the lower blowout preventer valve assembly: after the flexible joint shell 6 of the lower blowout preventer valve assembly is subjected to the bending stress from the blowout preventer pipe joint 100, the large rubber ring 8 will be elastically deformed to absorb the bending stress from the blowout preventer pipe joint 100 due to the large rubber ring pad ring 7 involved. At the same time, the small rubber ring 11 and the small rubber ring compression ring 13 move together with the flexible joint shell 6 to ensure the sealing of the internal passage of the flexible joint 200. The flexible joint 200 can tolerate a maximum bending angle of 10°, thereby increasing the deflection of other components above the lower blowout preventer valve assembly and improving the reliability of the entire intervention equipment.

[0069] The double-redundancy multifunctional lower blowout preventer assembly mechanism and the control system thereof can realize the functions of redundant injection of chemical agents of the lower blowout preventer assembly and other mechanisms on the upper part, redundant locking and disconnection of the hydraulic connector 300, control of key functions of the lower blowout preventer assembly and other mechanisms on the upper part, and increase of the deflection of the lower blowout preventer assembly and other components on the upper part.

[0070] The application has wide application prospects in the field of petroleum engineering and provides key technical support for the performance and safety of underwater light intervention equipment.

[0071] Obviously, the above embodiments of the application are only examples for clearly illustrating the application, and are not intended to limit the implementation modes of the application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the implementation modes are not required or can not be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the claims of the application.

Claims

1. A multifunctional lower blowout preventer assembly mechanism, characterized in that, Includes a lower blowout preventer assembly base, a hydraulic connector fixedly connected to the lower blowout preventer assembly base, a flexible joint fixedly connected to the hydraulic connector, and a blowout preventer pipeline connector fixedly connected to the end of the flexible joint away from the hydraulic connector, so that the blowout preventer pipeline connector can be angled through the flexible joint, and the blowout preventer pipeline connector can be connected to other mechanisms through the hydraulic connector. An underwater control unit is fixedly connected to the base of the lower blowout preventer assembly. A hydraulic circuit is connected to the underwater control unit, and an accumulator unit is connected to the hydraulic circuit. The accumulator unit is connected to the hydraulic circuit through the accumulator hydraulic line to provide hydraulic pressure to the underwater control unit, thereby enabling the underwater control unit to perform hydraulic control. The hydraulic circuit is connected to the hydraulic connector so that the surface control unit can control the locking or disengagement of the hydraulic connector and the external mechanism. A control panel is fixedly connected to the base of the lower blowout preventer assembly. One end of the control panel is connected to a chemical agent unit, and the end of the control panel away from the chemical agent unit is connected to the hydraulic oil circuit so that both the control panel and the underwater control unit can control the injection of chemical agents.

2. The multifunctional lower blowout preventer assembly mechanism according to claim 1, characterized in that, The hydraulic connector includes a connector housing, which is fixedly connected to the base of the lower blowout preventer assembly. A connector body is threaded onto the connector housing. One end of the connector body is connected to a flexible joint flange. A locking claw is provided on the outer side of the connector body away from the flexible joint. The connector body is connected to an external mechanism through the locking claw. A main release oil chamber, a secondary release oil chamber, and a locking oil chamber are provided between the locking claw and the connector housing. The clamping or opening of the locking claw is controlled by adjusting the hydraulic pressure in the main release oil chamber, the secondary release oil chamber, and the locking oil chamber. The main release oil chamber, the secondary release oil chamber, and the locking oil chamber are all connected to the hydraulic oil circuit so that the underwater control unit controls the locking or disengagement of the hydraulic connector and the external mechanism.

3. The multifunctional lower blowout preventer assembly mechanism according to claim 1, characterized in that, The flexible joint includes a flexible joint housing, which is connected to the flange of the blowout preventer valve pipeline joint. A mandrel is connected to the end of the flexible joint housing away from the blowout preventer valve pipeline joint. A small rubber ring washer, a small rubber ring, and a small rubber ring clamping ring are arranged in sequence at the end of the mandrel near the flexible joint housing. A large rubber ring and a large rubber ring washer are arranged in sequence on the outer side of the end of the mandrel near the flexible joint housing. The large rubber ring washer is threadedly connected to the flexible joint housing to fix the large rubber ring and the small rubber ring, thereby sealing the flexible joint housing and the mandrel.

4. The multifunctional lower blowout preventer assembly mechanism according to claim 1, characterized in that, The underwater control unit includes a low-pressure valve group and a high-pressure valve group. One end of the low-pressure valve group and the high-pressure valve group are connected to the hydraulic oil circuit, and the other end of the low-pressure valve group and the high-pressure valve group away from the hydraulic oil circuit are connected to the accumulator hydraulic line, so that the underwater control unit can perform hydraulic control through the low-pressure valve group and the high-pressure valve group.

5. The multifunctional lower blowout preventer assembly mechanism according to claim 1, characterized in that, The chemical agent unit includes a chemical agent storage tank located on the base of the lower blowout preventer assembly. A chemical agent pipeline is connected to the chemical agent storage tank. The end of the chemical agent pipeline away from the chemical agent storage tank is connected to a pipeline formed by a hydraulic connector, a flexible joint, and a blowout preventer pipeline connector. A chemical agent injection pump is connected to the chemical agent pipeline to provide fluid power for the chemical agent in the chemical agent pipeline.

6. The multifunctional lower blowout preventer assembly mechanism according to claim 5, characterized in that, The control panel is equipped with a first chemical injection valve, which is connected to a chemical pipeline so that the control panel can control the injection of chemical agents; the first chemical injection valve is equipped with a hydraulic control connector, which is connected to a hydraulic oil circuit so that the underwater control unit can control the opening and closing of the first chemical injection valve.

7. The multifunctional lower blowout preventer assembly mechanism according to claim 2, characterized in that, The control panel is equipped with an emergency release ROV interface, which is connected to the main release oil chamber and the locking oil chamber respectively, so as to allow the hydraulic connector to be separated from the external mechanism in an emergency.

8. A control system for a multi-functional lower blowout preventer assembly, controlling the multi-functional lower blowout preventer assembly as described in any one of claims 1-7, characterized in that, include: The communication module, connected to the central processing unit, is used to receive control signals from the surface control station; The central processing module, connected to the communication module, is used to receive control signals from the communication module and output control commands. The drive module, connected to the central processing module, is used to receive control commands from the central drive module and output execution commands. The valve assembly module is connected to the drive module, executes the commands output by the drive module, and adjusts the individual valves on the valve assembly. The execution module connects to the valve group module and executes corresponding commands through combinations of different valves in different valve groups.

9. The multifunctional lower blowout preventer assembly control system according to claim 8, characterized in that, The central processing module receives and outputs signals through the central processing unit; The drive module receives and outputs signals through the relay driver board; The valve group module includes a low-pressure valve group, a high-pressure valve group, and an accumulator unit. The low-pressure valve group includes an electrically controlled low-pressure valve group and an electrically controlled low-pressure pilot valve group. Both the electrically controlled low-pressure valve group and the electrically controlled low-pressure pilot valve group are connected to the accumulator unit. The electrically controlled low-pressure pilot valve group is also connected to the high-pressure valve group. The high-pressure valve group is connected to the accumulator unit. Hydraulic control is achieved by switching the low-pressure valve group. The execution module includes a first chemical injection valve connected to the low-pressure valve group and a hydraulic connector connected to the high-pressure valve group.

10. The multifunctional lower blowout preventer assembly control system according to claim 9, characterized in that, It also includes a backup communication module, which is connected to a backup central processing unit; the backup central processing unit is connected to a backup relay driver board, which is connected to a backup low-pressure valve group, which is connected to a backup first chemical injection valve. The backup low-pressure valve group includes a backup electrically controlled low-pressure valve group and a backup electrically controlled low-pressure pilot valve group. Both the backup electrically controlled low-pressure valve group and the backup electrically controlled low-pressure pilot valve group are connected to the backup accumulator unit. The backup electrically controlled low-pressure pilot valve group is also connected to the backup high-pressure valve group. The backup high-pressure valve group is connected to the backup accumulator unit and the backup high-pressure valve group is connected to the hydraulic connector to form a redundant control system.

Images