CN116733410A

CN116733410A - Electrohydraulic integrated valve group structure for controlling duplex blowout prevention box and use method thereof

Info

Publication number: CN116733410A
Application number: CN202310985148.4A
Authority: CN
Inventors: 田国徽; 张书军; 张宝龙; 宋亮; 陈付坤; 刘传滨; 陈春雷; 侯玉文; 杨帅
Original assignee: Huaxin Tangshan Petroleum Equipment Co ltd
Current assignee: Huaxin Tangshan Petroleum Equipment Co ltd
Priority date: 2023-08-07
Filing date: 2023-08-07
Publication date: 2023-09-12

Abstract

The invention relates to an electrohydraulic integrated valve group structure for controlling a duplex blowout prevention box and a using method thereof, belonging to the technical field of continuous oil pipe equipment. The port P1 is communicated with a quick clamping electromagnetic valve a (3-1), a one-way valve A (3-2), a clamping and loosening electromagnetic valve b (3-3) and a rodless cavity of a first blowout prevention box (1-4) in sequence, and a rod cavity of the first blowout prevention box is communicated with the clamping and loosening electromagnetic valve a of the first blowout prevention box, a port T of the electro-hydraulic integrated valve group of the duplex blowout prevention box and a hydraulic oil tank in sequence. The P2 port is communicated with a quick clamping electromagnetic valve b of a blowout prevention box II, a check valve II, a clamping and loosening electromagnetic valve b of the blowout prevention box II and a rodless cavity of the blowout prevention box II in sequence, and a rod cavity of the blowout prevention box II is communicated with a clamping and loosening electromagnetic valve a of the blowout prevention box II, a T port of an electrohydraulic integrated valve bank of the duplex blowout prevention box and a hydraulic oil tank in sequence. The invention has compact layout and reduced cost, and can meet the zero leakage requirement of the double-joint blowout prevention box control system.

Description

Electrohydraulic integrated valve group structure for controlling duplex blowout prevention box and use method thereof

Technical Field

The invention relates to an electrohydraulic integrated valve group structure for controlling a duplex blowout prevention box and a using method thereof, belonging to the technical field of continuous oil pipe equipment.

Background

The blowout prevention box is a key part of coiled tubing equipment, and is mainly used for controlling wellhead pressure in the operation process, effectively preventing blowout accidents and realizing safe construction.

The main flow control mode of the blowout prevention box in the domestic continuous oil pipe equipment at present adopts a zero-leakage manual ball valve to control the blowout prevention box to execute the compaction and the loosening of a hydraulic cylinder, and the source of a power system of the blowout prevention box at present mainly comprises two modes, namely a quick clamping control mode for providing a power oil source for a constant pressure pump and a gas-liquid supercharging control mode for providing the power oil source for a pneumatic booster pump. The quick clamping control mode is that oil output by the constant pressure pump is directly conveyed to the hydraulic cylinder of the blowout prevention box through the quick clamping control ball valve, so that the clamping of the rubber core of the blowout prevention box is quickly realized, the maximum pressure of the constant pressure pump is generally 3000psi, and an operator needs to correspond to a graph to determine the wellhead pressure which can be sealed by the blowout prevention box; the pneumatic booster pump control mode has the biggest characteristics that oil can be lifted to higher pressure, when the wellhead pressure is higher, the oil pressure provided by the constant pressure pump is insufficient, and at the moment, an anti-spraying box pressure adjusting knob on a control panel is needed, and the knob is used for adjusting the air inlet pressure of the pneumatic booster pump.

The fundamental problems of the pure hydraulic control operation mode are as follows: the hydraulic control reversing valve has the advantages that the requirement on the tightness of the valve is very high, the number of the valve members is large, the customized hydraulic control reversing valve is used, the hydraulic elements and the pipeline layout occupy the space of the control cabin, and the hydraulic system is difficult to check after faults occur.

Disclosure of Invention

The invention aims to provide an electrohydraulic integrated valve group structure for controlling a duplex blowout prevention box and a use method thereof, and the valve group structure not only can meet the basic requirement of hydraulic control operation of the traditional blowout prevention box, but also can meet the zero leakage requirement of a duplex blowout prevention box control system, and the valve group layout forming the system is concise and compact, can meet the intelligent and integrated requirements of the control system, and solves the problems existing in the background art.

The technical scheme of the invention is as follows:

the electro-hydraulic integrated valve group structure for controlling the duplex blowout prevention box comprises a pressure compensation variable pump, a speed regulation valve group, a duplex blowout prevention box electro-hydraulic integrated valve group, a blowout prevention box I and a blowout prevention box II, wherein the pressure compensation variable pump is connected with the speed regulation valve group and then is divided into two paths, and a P1 port and a P2 port of the duplex blowout prevention box electro-hydraulic integrated valve group are respectively connected;

the double blowout prevention box electrohydraulic integrated valve bank comprises a valve bank main body, a blowout prevention box I quick clamping electromagnetic valve a, a one-way valve I, a blowout prevention box I clamping and loosening electromagnetic valve b, a blowout prevention box 1 clamping and loosening electromagnetic valve a, a blowout prevention box II quick clamping electromagnetic valve b, a one-way valve II, a blowout prevention box II clamping and loosening electromagnetic valve b and a blowout prevention box II clamping and loosening electromagnetic valve a which are integrally inserted on the valve bank main body;

The port P1 is sequentially communicated with a quick clamping electromagnetic valve a of the blowout prevention box I, a one-way valve I, a clamping and loosening electromagnetic valve b of the blowout prevention box I and a rodless cavity of the blowout prevention box I, a rod cavity of the blowout prevention box I is sequentially communicated with the clamping and loosening electromagnetic valve a of the blowout prevention box I, a port T of an electrohydraulic integrated valve group of the duplex blowout prevention box and a hydraulic oil tank to form an oil circuit of the blowout prevention box I, and the power-on and power-off operation of the quick clamping electromagnetic valve a of the blowout prevention box I, the clamping and loosening electromagnetic valve b of the blowout prevention box I and the clamping and loosening electromagnetic valve a of the blowout prevention box I is controlled, so that the conduction of the oil circuit of the blowout prevention box I is controlled, and the clamping and loosening control of the blowout prevention boxes I1-4 is realized;

p2 mouth is in proper order with prevent spouting box two quick clamp solenoid valve b, check valve two, prevent spouting box two clamp release solenoid valve b and prevent spouting box two's rodless chamber intercommunication, prevent spouting box two have the pole chamber in proper order with prevent spouting box two clamp release solenoid valve a, the T mouth and the hydraulic tank intercommunication of the integrated valves of duplex preventing spouting box electrohydraulic, form prevent spouting box two oil circuits, prevent spouting box two quick clamp solenoid valve b in the integrated valves of through-hole control duplex preventing spouting box electrohydraulic, prevent spouting box two clamp release solenoid valve b and prevent spouting box two clamp release solenoid valve a get electric and lose electric action, control prevent spouting box two oil circuits switch on, realize the clamp and release control to preventing spouting box two.

Further, the hydraulic integrated valve set further comprises a pneumatic liquid booster pump, wherein the pneumatic liquid booster pump is connected with a P3 port of the hydraulic integrated valve set of the duplex blowout prevention box, the hydraulic integrated valve set of the duplex blowout prevention box further comprises a blowout prevention box selection electromagnetic valve a and a blowout prevention box selection electromagnetic valve b which are integrally inserted in the valve set main body, the rear end of the P3 port is connected with the blowout prevention box selection electromagnetic valve a and the blowout prevention box selection electromagnetic valve b in parallel, the blowout prevention box selection electromagnetic valve a is communicated with a rod cavity of the blowout prevention box through a blowout prevention box clamping and loosening electromagnetic valve a, and the blowout prevention box selection electromagnetic valve a is communicated with a rodless cavity of the blowout prevention box through a blowout prevention box clamping and loosening electromagnetic valve b; the blowout prevention box selecting electromagnetic valve b is communicated with a rodless cavity of a blowout prevention box II through a blowout prevention box II clamping and loosening electromagnetic valve b, and is communicated with a rod cavity of the blowout prevention box II through a blowout prevention box II clamping and loosening electromagnetic valve a;

the hydraulic oil of the pneumatic liquid booster pump enters a P3 port of the double-joint blowout prevention box electrohydraulic integrated valve group, when an electromagnet b of a blowout prevention box selection electromagnetic valve b is in power failure, a 1 port and a 2 port of the blowout prevention box selection electromagnetic valve b are normally closed, an oil way is not communicated, the electromagnet a of the blowout prevention box selection electromagnetic valve a is in power failure, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve a are normally communicated, hydraulic oil flows through the blowout prevention box selection electromagnetic valve b, enters from the 1 port of the blowout prevention box selection electromagnetic valve a, and is split into two paths after flowing out from the 2 port of the blowout prevention box selection electromagnetic valve a, enters into a P port of the blowout prevention box one clamping and releasing electromagnetic valve a and a P port of the blowout prevention box one clamping and releasing electromagnetic valve b respectively for standby, and clamping and releasing control of the corresponding blowout prevention box one clamping and releasing electromagnetic valve a is realized through on-off control of the electromagnet a of the blowout prevention box one clamping and releasing electromagnetic valve b; when the electromagnet b of the blowout prevention box selection electromagnetic valve b is electrified, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve b are normally communicated, the electromagnet a of the blowout prevention box selection electromagnetic valve a is electrified, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve a are normally closed, an oil way is not communicated, hydraulic oil flows through the blowout prevention box selection electromagnetic valve b, enters from the 1 port of the blowout prevention box selection electromagnetic valve b, the 2 port of the blowout prevention box selection electromagnetic valve b is divided into two paths after flowing out, and respectively enters into the P port of the blowout prevention box second clamping and loosening electromagnetic valve b and the P port of the blowout prevention box second clamping and loosening electromagnetic valve a for standby, and the clamping and loosening control of the blowout prevention box second clamping and loosening electromagnetic valve b and the electromagnet a of the blowout prevention box second clamping and loosening electromagnetic valve a are realized through the on-off control of the blowout prevention box second clamping and loosening electromagnetic valve b.

Further, the first quick clamping electromagnetic valve a of the blowout prevention box, the second quick clamping electromagnetic valve b of the blowout prevention box, the selection electromagnetic valve a of the blowout prevention box and the selection electromagnetic valve b of the blowout prevention box are two-position two-way electromagnetic valves.

Further, the first blowout prevention box clamping and loosening electromagnetic valve b, the first blowout prevention box 1 clamping and loosening electromagnetic valve a, the second blowout prevention box clamping and loosening electromagnetic valve b and the second blowout prevention box clamping and loosening electromagnetic valve a are all zero-leakage electromagnetic reversing ball valves.

The application method of the electrohydraulic integrated valve group structure for controlling the duplex blowout prevention box comprises the following steps: the hydraulic oil provided by the pressure compensation variable pump enters a speed regulation valve group, is divided into two paths after being subjected to speed regulation and flow division by the speed regulation valve group, and respectively enters a P1 port and a P2 port of an electrohydraulic integrated valve group of the double-joint blowout-preventing box to form the following loop;

(1) quick compacting loop of the spray box:

when the electromagnet b of the electromagnetic valve b is clamped and loosened by the blowout prevention box I and the electromagnet a of the electromagnetic valve a is simultaneously powered off, the oil cylinder of the blowout prevention box I is positioned at a rapid compression position;

when hydraulic oil enters a port P1, an electromagnet a of a quick clamping electromagnetic valve a of the blowout prevention box is controlled to be electrified, the quick clamping electromagnetic valve a of the blowout prevention box is reversed, liquid flow enters a port 1 of the quick clamping electromagnetic valve a of the blowout prevention box from the port P1 and flows out of a port 2 of the quick clamping electromagnetic valve a of the blowout prevention box, the liquid flow enters a one-way valve I, overcomes the pre-tightening force of a spring of the one-way valve I, opens a liquid flow channel of the one-way valve I, enters a port P of a clamping and loosening electromagnetic valve b of the blowout prevention box, the electromagnet b of the clamping and loosening electromagnetic valve b is deenergized, in an initial state, the clamping and loosening electromagnetic valve b of the blowout prevention box works in a left position by means of the pre-tightening force of the spring, the port P of the clamping and loosening electromagnetic valve b of the blowout prevention box is normally communicated with the port A, the liquid flow enters a rodless cavity of the blowout prevention box through the port A of the clamping and loosening electromagnetic valve b of the blowout prevention box, the liquid return flow enters the port A of the clamping and loosening electromagnetic valve a clamping and loosening a valve A of the blowout prevention box, the electromagnet a is in an initial state, the electromagnetic valve a clamping and a hydraulic oil loosening and loosening state is enabled to flow back to the valve box by means of the pre-tightening force, and the electromagnetic valve is enabled to be integrated, and the valve box is enabled to be in a state, and the valve is enabled to be in a tight and a valve is enabled to be in a state, and a tight valve is enabled to be in a tight valve;

(2) Quick release circuit for cartridge:

when the electromagnet b of the first blowout prevention box clamping and releasing electromagnetic valve b and the electromagnet a of the first blowout prevention box clamping and releasing electromagnetic valve a are simultaneously powered on, the oil cylinder of the first blowout prevention box is positioned at a quick release position;

when hydraulic oil enters the port P1, the electromagnet a of the quick clamping electromagnetic valve a of the blowout prevention box is controlled to be electrified, the quick clamping electromagnetic valve a of the blowout prevention box is commutated, liquid flow enters the port 1 of the quick clamping electromagnetic valve a of the blowout prevention box from the port P1 and flows out of the port 2 of the quick clamping electromagnetic valve a of the blowout prevention box, enters the one-way valve I, the liquid flow overcomes the pre-tightening force of the spring of the one-way valve I, opens the liquid flow passage of the one-way valve I, enters the port P of the clamping and loosening electromagnetic valve b of the blowout prevention box, the electromagnet b of the clamping and loosening electromagnetic valve b of the blowout prevention box is operated to be electrified, the clamping and loosening electromagnetic valve b of the blowout prevention box is commutated, the outlet of the one-way valve I is divided into two paths at the moment, the port P of the clamping and loosening electromagnetic valve b of the blowout prevention box is closed, one path of the liquid flow is not communicated with the port P of the clamping and loosening electromagnetic valve b of the blowout prevention box, the other path enters the P port of the blowout prevention box-clamping and loosening electromagnetic valve a, at the moment, the electromagnet a of the blowout prevention box-clamping and loosening electromagnetic valve a is operated to electrify, the blowout prevention box-clamping and loosening electromagnetic valve a is reversed, the blowout prevention box-clamping and loosening electromagnetic valve a works at the left position, the P port of the blowout prevention box-clamping and loosening electromagnetic valve a is normally communicated with the A port, liquid flows through the A port of the blowout prevention box-clamping and loosening electromagnetic valve a to enter a rod cavity of the blowout prevention box-clamping and loosening electromagnetic valve a, return oil of a rodless cavity of the blowout prevention box-clamping and loosening electromagnetic valve b enters the A port of the blowout prevention box-clamping and loosening electromagnetic valve b to stand by, at the moment, the blowout prevention box-clamping and loosening electromagnetic valve b works at the right position, the A port of the blowout prevention box-clamping and loosening electromagnetic valve b is normally communicated with the T port, liquid flows through the A port of the blowout prevention box-clamping and loosening electromagnetic valve b to enter the T port of the double-connection blowout prevention box electrohydraulic integrated valve set, and flows back to a hydraulic oil tank, the circulation realizes the quick release loop circulation of the blowout prevention box I;

(3) Blowout prevention box one middle position floating loop

When the electromagnet b of the electromagnetic valve b is powered on, the electromagnet a of the electromagnetic valve a is powered off, and the oil cylinder of the electromagnetic valve a is in a floating middle position;

when the electromagnet a of the clamping and loosening electromagnetic valve a of the blowout prevention box I loses power, the clamping and loosening electromagnetic valve a of the blowout prevention box I is in an initial position, an A port and a T port of the clamping and loosening electromagnetic valve a of the blowout prevention box I are communicated, a rod cavity liquid flow of the blowout prevention box I flows through the A port and the T port of the clamping and loosening electromagnetic valve a of the blowout prevention box I, and flows back to a hydraulic oil tank through the T port of the electro-hydraulic integrated valve group of the duplex blowout prevention box;

at the moment, an electromagnet b of a clamping and loosening electromagnetic valve b of the blowout prevention box I is electrified, the clamping and loosening electromagnetic valve b of the blowout prevention box I is reversed, an A port of the clamping and loosening electromagnetic valve b of the blowout prevention box I is communicated with a T port, and liquid flow of a rodless cavity of the blowout prevention box I flows through the A port and the T port of the clamping and loosening electromagnetic valve b of the blowout prevention box I and flows back to a hydraulic oil tank through the T port of an electrohydraulic integrated valve group of the duplex blowout prevention box;

the rod cavity and the rodless cavity of the blowout prevention box I are communicated with the hydraulic oil tank, and the clamping oil cylinder of the blowout prevention box I is in a floating neutral position state;

(4) and a second quick compacting loop of the spraying box:

when the electromagnet b of the electromagnetic valve b is clamped and loosened by the second blowout prevention box and the electromagnet a of the electromagnetic valve a is simultaneously powered off, the oil cylinder of the second blowout prevention box is positioned at a quick compression position;

When hydraulic oil enters the port P2, the electromagnet b of the quick clamping electromagnetic valve b of the blowout prevention box II is controlled to be electrified, the quick clamping electromagnetic valve b of the blowout prevention box II commutates, liquid flow enters the port 1 of the quick clamping electromagnetic valve b of the blowout prevention box II from the port P2 and flows out of the port 2 of the quick clamping electromagnetic valve b of the blowout prevention box II, the liquid flow enters the check valve II, overcomes the spring pretightening force of the check valve II, opens the liquid flow passage of the check valve II, enters the port P of the clamping and loosening electromagnetic valve b of the blowout prevention box II to stand by, the electromagnet b of the clamping and loosening electromagnetic valve b of the blowout prevention box II is deenergized, the clamping and loosening electromagnetic valve b of the blowout prevention box II works in the left position by means of the pretightening force of the spring under the initial state, the port P of the clamping and loosening electromagnetic valve b of the blowout prevention box II is normally communicated with the port A, the method comprises the steps that liquid flow passes through a port P of a clamping and loosening electromagnetic valve b of a blowout prevention box II and enters a rodless cavity A of the blowout prevention box II, oil return from a rod cavity A of the blowout prevention box II enters a port A of a clamping and loosening electromagnetic valve a of the blowout prevention box II to stand by, at the moment, an electromagnet a of the clamping and loosening electromagnetic valve a of the blowout prevention box II loses power, the clamping and loosening electromagnetic valve a of the blowout prevention box II works at a right position by means of the pretightening force of a spring in an initial state, the port A of the clamping and loosening electromagnetic valve a of the blowout prevention box II is normally communicated with a port T, hydraulic oil in the rod cavity A of the blowout prevention box II passes through the port A of the clamping and loosening electromagnetic valve a of the blowout prevention box II and enters a port T of an electrohydraulic integrated valve group of the duplex blowout prevention box through the port T of the clamping and loosening electromagnetic valve a of the blowout prevention box II, and flows back to a hydraulic oil tank;

(5) And a second quick release loop of the blowout prevention box:

when the electromagnet b of the second blowout prevention box clamping and releasing electromagnetic valve b and the electromagnet a of the second blowout prevention box clamping and releasing electromagnetic valve a are simultaneously powered on, the oil cylinder of the second blowout prevention box is positioned at a quick release position;

when hydraulic oil enters the P2 port, the electromagnet b of the second quick clamping electromagnetic valve b of the blowout prevention box is controlled to be electrified, the second quick clamping electromagnetic valve b of the blowout prevention box is controlled to be commutated, at the moment, liquid flow enters the P2 port of the second quick clamping electromagnetic valve b of the blowout prevention box, flows out of the 2 port of the second quick clamping electromagnetic valve b of the blowout prevention box, enters the second check valve, overcomes the pre-tightening force of the spring of the second check valve, opens the liquid flow channel of the second check valve, enters the P port of the second clamping and loosening electromagnetic valve b of the blowout prevention box, at the moment, the electromagnet b of the second clamping and loosening electromagnetic valve b is operated to be electrified, at the moment, the outlet of the second check valve is separated into two paths, the P port of the second clamping and loosening electromagnetic valve b is closed, one path is not communicated with the P port of the second clamping and loosening electromagnetic valve b of the blowout prevention box, at the other path is communicated with the P port of the second clamping and loosening electromagnetic valve b of the blowout prevention box, at the moment, the electro-hydraulic fluid flow enters the P port of the second clamping and loosening electromagnetic valve a of the second clamping and loosening electromagnetic valve b of the blowout prevention box is operated, the electromagnetic valve b of the second clamping and the hydraulic flow returns to the valve b of the blowout prevention box is normally, and the valve b of the valve b is opened, and the valve is opened, the circulation realizes the quick release loop circulation of the blowout prevention box II;

(6) Blowout prevention box two middle position floating loop

When the electromagnet b of the electromagnetic valve b is powered on, the electromagnet a of the electromagnetic valve a is powered off, and the oil cylinder of the second blowout prevention box is in a floating middle position;

when the electromagnet a of the second clamping and loosening electromagnetic valve a of the blowout prevention box is in a power failure, the second clamping and loosening electromagnetic valve a of the blowout prevention box is in an initial position, an A port and a T port of the second clamping and loosening electromagnetic valve a of the blowout prevention box are communicated, and a rod cavity liquid flow of the second blowout prevention box flows through the A port and the T port of the second clamping and loosening electromagnetic valve a of the blowout prevention box and flows back to a hydraulic oil tank through the T port of the electro-hydraulic integrated valve group of the duplex blowout prevention box;

at the moment, an electromagnet b of a clamping and loosening electromagnetic valve b of a blowout prevention box II is electrified, the clamping and loosening electromagnetic valve b of the blowout prevention box II is reversed, an A port of the clamping and loosening electromagnetic valve b of the blowout prevention box II is communicated with a T port, and liquid flow of a rodless cavity of the blowout prevention box II flows through the A port and the T port of the clamping and loosening electromagnetic valve b of the blowout prevention box II and flows back to a hydraulic oil tank through the T port of an electrohydraulic integrated valve group of the duplex blowout prevention box;

thus, the rod cavity and the rodless cavity of the second blowout prevention box are communicated with the hydraulic oil tank, and the clamping oil cylinder of the second blowout prevention box is in a floating neutral position state.

When the equipment is in a deep well working condition, along with the continuous rising of the well pressure, the system pressure set by the pressure compensation variable pump 1-1 is insufficient to ensure the clamping and sealing of the first rubber core of the blowout prevention box and the second rubber core of the blowout prevention box, at the moment, the pneumatic liquid booster pump needs to be independently operated, hydraulic oil output by the pneumatic liquid booster pump enters through the P3 port of the electrohydraulic integrated valve group of the duplex blowout prevention box, and when the hydraulic oil flows through the P3 port, the hydraulic oil enters into the blowout prevention box selection electromagnetic valve a and the blowout prevention box selection electromagnetic valve b in two ways, wherein the blowout prevention box selection electromagnetic valve b is in a normally closed position, and the blowout prevention box selection electromagnetic valve a is in a normally open position;

When the electromagnet b of the blowout prevention box selection electromagnetic valve b is in power failure, the opening 1 and the opening 2 of the blowout prevention box selection electromagnetic valve b are normally closed, an oil way is not communicated, the electromagnet a of the blowout prevention box selection electromagnetic valve a is in power failure, the opening 1 and the opening 2 of the blowout prevention box selection electromagnetic valve a are normally communicated, liquid flows through the blowout prevention box selection electromagnetic valve a, enters from the opening 1 of the blowout prevention box selection electromagnetic valve a, and flows out from the opening 2 of the blowout prevention box selection electromagnetic valve a, respectively enters into the P opening of the blowout prevention box clamping and releasing electromagnetic valve a and the P opening of the blowout prevention box clamping and releasing electromagnetic valve b for standby, and the clamping and releasing control of the corresponding blowout prevention box I is realized through the on-off control of the electromagnet a of the blowout prevention box I clamping and releasing electromagnetic valve a and the electromagnet b of the blowout prevention box I;

when the electromagnet b of the blowout prevention box selection electromagnetic valve b is electrified, the 1 port and the 2 ports of the blowout prevention box selection electromagnetic valve b are normally communicated, the electromagnet a of the blowout prevention box selection electromagnetic valve a is electrified, the 1 port and the 2 ports of the blowout prevention box selection electromagnetic valve a are normally closed, an oil way is not communicated, liquid flows through the blowout prevention box selection electromagnetic valve b, enters from the 1 port of the blowout prevention box selection electromagnetic valve b, and flows out from the 2 ports of the blowout prevention box selection electromagnetic valve b, respectively enters into the P port of the blowout prevention box second clamping and loosening electromagnetic valve b and the P port of the blowout prevention box second clamping and loosening electromagnetic valve a for standby, and the clamping and loosening control of the blowout prevention box second clamping and loosening electromagnetic valve b and the electromagnet a of the blowout prevention box second clamping and loosening electromagnetic valve a are realized through on-off control.

The invention has the positive effects that: the traditional manual hydraulic control blowout prevention box operation scheme is replaced by the duplex blowout prevention box electrohydraulic integrated valve bank, the control oil routing hydraulic control is changed into electric control, the whole set of valve bank is compact in structure, the control oil duct is integrated inside the duplex blowout prevention box electrohydraulic integrated valve bank, a complex peripheral circuit is omitted, the layout is compact, the cost is reduced, and the zero leakage requirement of a duplex blowout prevention box control system can be met.

Drawings

FIG. 1 is a schematic diagram of the control oil circuit wiring of the present invention;

FIG. 2 is a schematic diagram of the structure of the electrohydraulic integrated valve set of the dual-purpose blowout preventer of the invention;

FIG. 3 is a schematic diagram of the internal hydraulic pressure of the electrohydraulic integrated valve set of the dual-purpose blowout preventer of the invention;

in the figure: the hydraulic pressure compensation variable pump comprises a pressure compensation variable pump 1-1, a speed regulation valve group 1-2, a duplex blowout prevention box electrohydraulic integrated valve group 1-3, a blowout prevention box I1-4, a blowout prevention box II 1-5, a pneumatic liquid booster pump 1-6, a valve group main body 3-0, a blowout prevention box I quick clamping electromagnetic valve a3-1, a check valve I3-2, a blowout prevention box I clamping and loosening electromagnetic valve b3-3, a blowout prevention box I clamping and loosening electromagnetic valve a3-5, a blowout prevention box II quick clamping electromagnetic valve b3-6, a check valve II 3-7, a blowout prevention box II clamping and loosening electromagnetic valve b3-8, a blowout prevention box II clamping and loosening electromagnetic valve a 3-10, a blowout prevention box selection electromagnetic valve a3-11 and a blowout prevention box selection electromagnetic valve b3-12.

Detailed Description

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

as shown in fig. 1, the embodiment provides an electrohydraulic integrated valve group structure for controlling a duplex blowout prevention box, which comprises a pressure compensation variable pump 1-1, a speed regulation valve group 1-2, a duplex blowout prevention box electrohydraulic integrated valve group 1-3, a blowout prevention box I1-4, a blowout prevention box II 1-5 and a pneumatic liquid booster pump 1-6, wherein the pressure compensation variable pump 1-1 is connected with the speed regulation valve group 1-2 and then is divided into two paths, and a P1 port and a P2 port of the duplex blowout prevention box electrohydraulic integrated valve group 1-3 are respectively connected.

In this embodiment, the duplex blowout prevention box electrohydraulic integrated valve group 1-3 includes a valve group main body 3-0, a blowout prevention box one quick clamping solenoid valve a3-1, a check valve one 3-2, a blowout prevention box one clamping and loosening solenoid valve b3-3, a blowout prevention box 1 clamping and loosening solenoid valve a3-5, a blowout prevention box two quick clamping solenoid valve b3-6, a check valve two 3-7, a blowout prevention box two clamping and loosening solenoid valve b3-8, a blowout prevention box two clamping and loosening solenoid valve a 3-10, a blowout prevention box selection solenoid valve a3-11 and a blowout prevention box selection solenoid valve b3-12.

The invention replaces the traditional manual hydraulic control blowout prevention box with the duplex blowout prevention box electrohydraulic integrated valve group, omits a lengthy pipeline joint, greatly reduces the whole set of integrated valve group mounting elements and connecting pipelines, saves the manufacturing time, and obviously improves the reliability while realizing the control function of the integrated valve group due to the reduction of system pollutants and leakage points and the reduction of assembly errors.

Referring to fig. 3, the main control logic of the blowout prevention box I of the present invention is as follows, the electromagnet b of the clamping and releasing electromagnetic valve b3-3 of the blowout prevention box I and the electromagnet a of the clamping and releasing electromagnetic valve a3-5 of the blowout prevention box I are powered off, and the oil cylinder of the blowout prevention box I is pressed; the electromagnet b of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box I and the electromagnet a of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box I are powered on, and the oil cylinder of the blowout prevention box I is loosened; the electromagnet b of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box I is powered on, the electromagnet a of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box I is powered off, and the oil cylinder of the blowout prevention box I is in a floating middle position. The main control logic of the blowout prevention box II is the same as that of the blowout prevention box I.

The P1 port of the duplex blowout prevention box electrohydraulic integrated valve group 1-3 is sequentially communicated with a blowout prevention box one quick clamping electromagnetic valve a3-1, a one-way valve one 3-2, a blowout prevention box one clamping and loosening electromagnetic valve b3-3 and a rodless cavity of the blowout prevention box one 1-4, the rod cavity of the blowout prevention box one 1-4 is sequentially communicated with a blowout prevention box one clamping and loosening electromagnetic valve a3-5, a T port of the duplex blowout prevention box electrohydraulic integrated valve group 1-3 and a hydraulic oil tank to form a blowout prevention box one oil path, and the blowout prevention box one oil path is controlled to be conducted by controlling the power supply and power failure operations of the blowout prevention box one quick clamping electromagnetic valve a3-1, the blowout prevention box one clamping and loosening electromagnetic valve b3-3 and the blowout prevention box one clamping and loosening electromagnetic valve a3-5, so that the blowout prevention box one oil path is controlled to realize the clamping and loosening control of the blowout prevention box one 1-4;

The P2 port of the duplex blowout prevention box electrohydraulic integrated valve bank 1-3 is sequentially communicated with a blowout prevention box second rapid clamping electromagnetic valve b3-6, a one-way valve second 3-7, a blowout prevention box second clamping and loosening electromagnetic valve b3-8 and a rodless cavity of a blowout prevention box second 1-5, the rod cavity of the blowout prevention box second 1-5 is sequentially communicated with a blowout prevention box second clamping and loosening electromagnetic valve a 3-10, a T port of the duplex blowout prevention box electrohydraulic integrated valve bank 1-3 and a hydraulic oil tank to form a blowout prevention box second oil circuit, the through hole controls the blowout prevention box second rapid clamping electromagnetic valve b3-6, the blowout prevention box second clamping and loosening electromagnetic valve b3-8 and the blowout prevention box second clamping and loosening electromagnetic valve a 3-10 in the duplex blowout prevention box electrohydraulic integrated valve bank 1-3 to obtain power and power failure actions, the conduction of the blowout prevention box second oil circuit is controlled, and the clamping and loosening control of the blowout prevention box second 1-5 is realized.

When the equipment is in a deep well working condition, along with the continuous rising of the well pressure, the system pressure set by the pressure compensation variable pump 1-1 is insufficient to ensure the clamping and sealing of the blowout prevention box rubber core, the pneumatic liquid booster pump 1-6 is required to be independently operated at the moment, the highest output pressure of the pneumatic liquid booster pump 1-6 can reach 35Mpa, and the hydraulic output pressure of the pneumatic liquid booster pump 1-6 can be controlled by adjusting the air source pressure of the system, so that the special requirement of the continuously rising well pressure on the high clamping pressure of the blowout prevention box rubber core is met.

The pneumatic liquid booster pump 1-6 is connected with a P3 port of the duplex blowout prevention box electrohydraulic integrated valve group 1-3, the rear end of the P3 port is connected with a blowout prevention box selection electromagnetic valve a3-11 and a blowout prevention box selection electromagnetic valve b3-12 in parallel, the blowout prevention box selection electromagnetic valve a3-11 is communicated with a rod cavity of the blowout prevention box 1-4 through a blowout prevention box clamping and loosening electromagnetic valve a 3-5, and the blowout prevention box selection electromagnetic valve a3-11 is communicated with a rodless cavity of the blowout prevention box 1-4 through a blowout prevention box clamping and loosening electromagnetic valve b 3-3; the blowout prevention box selection electromagnetic valve b3-12 is communicated with the rodless cavity of the blowout prevention box II 1-5 through the blowout prevention box II clamping and loosening electromagnetic valve b3-8, and the blowout prevention box selection electromagnetic valve b3-12 is communicated with the rod cavity of the blowout prevention box II 1-5 through the blowout prevention box II clamping and loosening electromagnetic valve a 3-10;

the hydraulic oil of the pneumatic liquid booster pump 1-6 enters a P3 port of the duplex blowout prevention box electrohydraulic integrated valve bank 1-3, when an electromagnet b of a blowout prevention box selection electromagnetic valve b3-12 loses electricity, the 1 port of the blowout prevention box selection electromagnetic valve b3-12 is normally closed with a 2 port, an oil circuit is not communicated, the electromagnet a of the blowout prevention box selection electromagnetic valve a3-11 loses electricity, the 1 port of the blowout prevention box selection electromagnetic valve a3-11 is normally communicated with the 2 port, the hydraulic oil flows through the blowout prevention box selection electromagnetic valve b3-12, enters from the 1 port of the blowout prevention box selection electromagnetic valve a3-11, and is divided into two paths after flowing out, respectively enters a P port of a blowout prevention box one clamping and releasing electromagnetic valve a 3-5 and a P port of a blowout prevention box one clamping and releasing electromagnetic valve b3-3 for standby, and the on-off control of the electromagnet a corresponding blowout prevention box one clamping and releasing electromagnetic valve a 3-5 and the electromagnet b of the blowout prevention box one clamping and releasing electromagnetic valve b3-3 is realized; when the electromagnet b of the blowout prevention box selection electromagnetic valve b3-12 is electrified, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve b3-12 are always electrified, the electromagnet a of the blowout prevention box selection electromagnetic valve a3-11 is electrified, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve a3-11 are normally closed, an oil way is not electrified, hydraulic oil flows through the blowout prevention box selection electromagnetic valve b3-12, the hydraulic oil enters from the 1 port of the blowout prevention box selection electromagnetic valve b3-12, the hydraulic oil flows out from the 2 port and is divided into two paths, and the two paths enter into the P port of the blowout prevention box second clamping and releasing electromagnetic valve b3-8 and the P port of the blowout prevention box second clamping and releasing electromagnetic valve a 3-10 respectively for standby, and the clamping and releasing control of the blowout prevention box second clamping and releasing electromagnetic valve b3-8 and the electromagnet a of the blowout prevention box second clamping and releasing electromagnetic valve a 3-10 is realized.

In the embodiment, the first quick clamping electromagnetic valve a3-1 of the blowout prevention box, the second quick clamping electromagnetic valve b3-6 of the blowout prevention box, the selection electromagnetic valve a3-11 of the blowout prevention box and the selection electromagnetic valve b3-12 of the blowout prevention box are two-position two-way electromagnetic valves.

The first blowout prevention box clamping and loosening electromagnetic valve b3-3, the blowout prevention box 1 clamping and loosening electromagnetic valve a3-5, the second blowout prevention box clamping and loosening electromagnetic valve b3-8 and the second blowout prevention box clamping and loosening electromagnetic valve a 3-10 are all zero-leakage electromagnetic reversing ball valves.

The application method of the electrohydraulic integrated valve group structure for controlling the duplex blowout prevention box comprises the following steps: when the pressure compensation variable pump 1-1 works, the system works in a constant pressure mode of 21Mpa, hydraulic oil provided by the pressure compensation variable pump 1-1 enters the speed regulating valve group 1-2, is divided into two paths after speed regulation and flow division by the speed regulating valve group 1-2, and respectively enters a P1 port and a P2 port of the double-joint blowout-prevention box electrohydraulic integrated valve group 1-3 to form the following loop;

(1) quick compacting loop of the spray box:

when the electromagnet b of the first blowout prevention box clamping and releasing electromagnetic valve b3-3 and the electromagnet a of the first blowout prevention box clamping and releasing electromagnetic valve a3-5 are simultaneously powered off, the oil cylinder of the first blowout prevention box 1-4 is positioned at a rapid compression position;

when hydraulic oil enters the port P1, the electromagnet a of the quick clamping electromagnetic valve a3-1 of the blowout prevention box is controlled to be electrified, the quick clamping electromagnetic valve a3-1 of the blowout prevention box is reversed, liquid flow enters the port 1 of the quick clamping electromagnetic valve a3-1 of the blowout prevention box from the port P1, flows out of the port 2 of the quick clamping electromagnetic valve a3-1 of the blowout prevention box and enters the one-way valve 3-2, the liquid flow overcomes the spring pretightening force of the one-way valve 3-2, the liquid flow channel of the one-way valve 3-2 is opened, the liquid flow enters the port P of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box to stand by, at the moment, the electromagnet b of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box is deenergized, the port P of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box is operated at the left position by virtue of the pretightening force of the spring under the initial state, the port P of the clamping and the port A of the clamping and loosening electromagnetic valve b3-3 are normally communicated, the liquid flow enters the rodless cavity of the blowout prevention box 1-4 through the port A of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box, the oil return of the rod cavity of the blowout prevention box 1-4 enters the port A of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box, the electromagnet a of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box is on standby, the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box is powered off at the moment, the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box works at the right position by means of the pretightening force of a spring in the initial state, the port A of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box is always communicated with the port T, the hydraulic oil of the rod cavity of the blowout prevention box 1-4 flows through the port A of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box and enters the port T of the electrohydraulic integrated valve set 1-3 of the duplex blowout prevention box through the port T of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box, flowing back to the hydraulic oil tank, and realizing the quick compression loop circulation of the blowout prevention box I;

(2) Quick release circuit for cartridge:

when the electromagnet b of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box I and the electromagnet a of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box I are simultaneously powered on, the oil cylinder of the blowout prevention box I1-4 is positioned at a quick loosening position;

when hydraulic oil enters the port P1, the electromagnet a of the quick clamping electromagnetic valve a3-1 of the blowout prevention box is controlled to be electrified, the quick clamping electromagnetic valve a3-1 of the blowout prevention box is electrified, liquid flow enters the port 1 of the quick clamping electromagnetic valve a3-1 of the blowout prevention box from the port P1 and flows out of the port 2 of the quick clamping electromagnetic valve a3-1 of the blowout prevention box into the one-way valve 3-2, the liquid flow overcomes the spring pretightening force of the one-way valve 3-2, the liquid flow channel of the one-way valve 3-2 is opened, the liquid flow enters the port P of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box, the electromagnet b of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box is operated to be electrified, the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box is commutated, and the outlet of the one-way valve 3-2 is separated into two paths, because the P port of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box is closed, one path is not communicated with the P port oil way of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box, the other path enters the P port of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box, at the moment, the electromagnet a of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box is operated to electrify, the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box is reversed, the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box works at the left position, the P port of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box is always communicated with the A port, liquid flow enters a rod cavity of the blowout prevention box 1-4 through the A port by the P port of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box, return oil of a rodless cavity of the blowout prevention box 1-4 enters the A port of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box for standby, at the moment, the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box I works at the right position, the opening A of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box I is communicated with the opening T, liquid flows through the opening A of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box I, flows through the opening T and enters the opening T of the electro-hydraulic integrated valve group 1-3 of the duplex blowout prevention box, flows back to a hydraulic oil tank, and the circulation realizes the quick loosening loop circulation of the blowout prevention box I1-4;

(3) Spray box one middle position floating loop

When the electromagnet b of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box I is powered on, the electromagnet a of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box I is powered off, and the oil cylinder of the blowout prevention box I is in a floating middle position;

when the electromagnet a of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box I is in a power failure, the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box I is in an initial position, an A port and a T port of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box I are communicated, a rod cavity liquid flow of the blowout prevention box I1-4 passes through the A port and the T port of the clamping and loosening electromagnetic valve a3-5 of the blowout prevention box I, and flows back to a hydraulic oil tank through the T port of the duplex blowout prevention box electrohydraulic integrated valve group 1-3;

at the moment, an electromagnet b of a clamping and loosening electromagnetic valve b3-3 of the blowout prevention box I is electrified, the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box I is reversed, an A port of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box I is communicated with a T port, and liquid flow of a rodless cavity of the blowout prevention box I1-4 flows through the A port and the T port of the clamping and loosening electromagnetic valve b3-3 of the blowout prevention box I and flows back to a hydraulic oil tank through the T port of the duplex blowout prevention box electrohydraulic integrated valve group 1-3;

the rod cavity and the rodless cavity of the blowout prevention box I1-4 are communicated with the hydraulic oil tank, and the clamping oil cylinder of the blowout prevention box I1-4 is in a floating neutral state;

(4) and a second quick compacting loop of the spraying box:

When the electromagnet b of the second blowout prevention box clamping and releasing electromagnetic valve b3-8 and the electromagnet a of the second blowout prevention box clamping and releasing electromagnetic valve a 3-10 are simultaneously powered off, the oil cylinder of the second blowout prevention box 1-5 is positioned at a quick compression position;

when hydraulic oil enters the port P2, the electromagnet b of the second quick clamping electromagnetic valve b3-6 of the blowout prevention box is controlled to be electrified, the second quick clamping electromagnetic valve b3-6 of the blowout prevention box is reversed, at the moment, liquid flow enters the port 1 of the second quick clamping electromagnetic valve b3-6 of the blowout prevention box from the port P2 and flows out of the port 2 of the second quick clamping electromagnetic valve b3-6 of the blowout prevention box, enters the one-way valve II 3-7, the liquid flow overcomes the pre-tightening force of the spring of the one-way valve II 3-7, the liquid flow passage of the one-way valve II 3-7 is opened, the liquid flow enters the port P of the second clamping and loosening electromagnetic valve b3-8 of the blowout prevention box to stand by, at the moment, the electromagnet b of the second clamping and loosening electromagnetic valve b3-8 of the blowout prevention box is deenergized, and in the left position, the second clamping and loosening electromagnetic valve b3-8 of the blowout prevention box works by means of the pre-tightening force of the spring under the initial state, the P port and the A port of the clamping and loosening electromagnetic valve b3-8 of the blowout prevention box II are normally communicated, liquid flow flows through the A port through the P port of the clamping and loosening electromagnetic valve b3-8 of the blowout prevention box II to enter a rodless cavity of the blowout prevention box II 1-5, oil return from a rod cavity of the blowout prevention box II 1-5 enters the A port of the clamping and loosening electromagnetic valve a 3-10 of the blowout prevention box II to stand by, at the moment, the electromagnet a of the clamping and loosening electromagnetic valve a 3-10 of the blowout prevention box II loses electricity, in an initial state, the clamping and loosening electromagnetic valve a 3-10 of the blowout prevention box II works at the right position by means of the pretightening force of a spring, the A port and the T port of the clamping and loosening electromagnetic valve a 3-10 of the blowout prevention box II are normally communicated, at the moment, hydraulic oil in the rod cavity of the blowout prevention box II 1-5 flows through the A port of the clamping and loosening electromagnetic valve a 3-10 of the blowout prevention box II, then the T port of the electromagnetic valve a 3-10 is clamped and loosened by the blowout prevention box II and enters the T port of the electrohydraulic integrated valve group 1-3 of the duplex blowout prevention box, and flows back to the hydraulic oil tank, so that the circulation of the blowout prevention box I fast compression loop is realized;

(5) And a second quick release loop of the blowout prevention box:

when the electromagnet b of the second blowout prevention box clamping and releasing electromagnetic valve b3-8 and the electromagnet a of the second blowout prevention box clamping and releasing electromagnetic valve a 3-10 are simultaneously powered on, the oil cylinder of the second blowout prevention box 1-5 is positioned at a quick release position;

when hydraulic oil enters the P2 port, the electromagnet b of the second quick clamping electromagnetic valve b3-6 of the blowout prevention box is controlled to be electrified, at the moment, liquid flow enters the 1 port of the second quick clamping electromagnetic valve b3-6 of the blowout prevention box from the P2 port, then flows out of the 2 port of the second quick clamping electromagnetic valve b3-6 of the blowout prevention box, enters the one-way valve II 3-7, the liquid flow overcomes the spring pretightening force of the one-way valve II 3-7, the liquid flow passage of the one-way valve II 3-7 is opened, the liquid flow enters the P port of the second clamping and loosening electromagnetic valve b3-8 of the blowout prevention box, at the moment, the electromagnet b of the second clamping and loosening electromagnetic valve b3-8 of the blowout prevention box is operated to be electrified, at the moment, the outlet of the one-way valve II 3-7 is separated into two paths, because the P port of the blowout prevention box II clamping and loosening electromagnetic valve b3-8 is closed, one path is not communicated with the P port oil way of the blowout prevention box II clamping and loosening electromagnetic valve b3-8, the other path enters the P port of the blowout prevention box II clamping and loosening electromagnetic valve a 3-10, at the moment, the electromagnet a of the blowout prevention box II clamping and loosening electromagnetic valve a 3-10 is operated to electrify, the blowout prevention box II clamping and loosening electromagnetic valve a 3-10 is reversed, the blowout prevention box II clamping and loosening electromagnetic valve a 3-10 works at the left position, the P port of the blowout prevention box II clamping and loosening electromagnetic valve a 3-10 is communicated with the A port, liquid flow enters a rod cavity of the blowout prevention box II 1-5 through the A port by the P port of the blowout prevention box II clamping and loosening electromagnetic valve a 3-10, return oil of a rodless cavity of the blowout prevention box II-5 enters the A port of the blowout prevention box II clamping and loosening electromagnetic valve b3-8 to stand by, at the moment, a clamping and loosening electromagnetic valve b3-8 of a blowout prevention box II works at the right position, an A port of the clamping and loosening electromagnetic valve b3-8 of the blowout prevention box II is communicated with a T port, liquid flows through the A port of the clamping and loosening electromagnetic valve b3-8 of the blowout prevention box II, flows through the T port and enters a T port of an electrohydraulic integrated valve group 1-3 of the duplex blowout prevention box, flows back to a hydraulic oil tank, and the circulation realizes the quick loosening loop circulation of the blowout prevention box II 1-5;

(6) Two middle position floating loops of spray box

When the electromagnet b of the second clamping and loosening electromagnetic valve b3-8 of the blowout prevention box is powered on, the electromagnet a of the second clamping and loosening electromagnetic valve a3-10 of the blowout prevention box is powered off, and the oil cylinder of the second blowout prevention box is in a floating middle position;

when the electromagnet a of the second clamping and loosening electromagnetic valve a3-10 of the blowout prevention box is in a power failure, the second clamping and loosening electromagnetic valve a3-10 of the blowout prevention box is in an initial position, an A port and a T port of the second clamping and loosening electromagnetic valve a3-10 of the blowout prevention box are communicated, and rod cavity liquid flow of the second 1-5 of the blowout prevention box flows through the A port and the T port of the second clamping and loosening electromagnetic valve a3-10 of the blowout prevention box and flows back to a hydraulic oil tank through the T port of the duplex blowout prevention box electrohydraulic integrated valve group 1-3;

at the moment, an electromagnet b of a clamping and loosening electromagnetic valve b3-8 of a blowout prevention box II is electrified, the clamping and loosening electromagnetic valve b3-8 of the blowout prevention box II is reversed, an A port of the clamping and loosening electromagnetic valve b3-8 of the blowout prevention box II is communicated with a T port, and at the moment, liquid flow of a rodless cavity of the blowout prevention box II 1-5 flows through the A port and the T port of the clamping and loosening electromagnetic valve b3-8 of the blowout prevention box II and flows back to a hydraulic oil tank through the T port of the duplex blowout prevention box electrohydraulic integrated valve group 1-3;

the rod cavity and the rodless cavity of the second blowout prevention box 1-5 are communicated with the hydraulic oil tank, and the clamping oil cylinder of the second blowout prevention box 1-5 is in a floating neutral position state.

When the equipment is in a deep well working condition, along with the continuous rising of the well pressure, the system pressure set by the pressure compensation variable pump 1-1 is insufficient to ensure the clamping and sealing of the first rubber core of the blowout prevention box and the second rubber core of the blowout prevention box, at the moment, the pneumatic liquid booster pump 1-6 needs to be independently operated, the highest output pressure of the pneumatic liquid booster pump 1-6 can reach 35Mpa, the hydraulic output pressure of the pneumatic liquid booster pump 1-6 can be controlled by adjusting the air source pressure of the system, so that the requirement of the continuous rising well pressure on the high clamping pressure of the first rubber core of the blowout prevention box and the second rubber core of the blowout prevention box is met, hydraulic oil output by the pneumatic liquid booster pump 1-6 enters through a P3 port of the double blowout prevention box electrohydraulic integrated valve group 1-3, and enters into the blowout prevention box selection electromagnetic valve a3-11 and the blowout prevention box selection electromagnetic valve b3-12 in two ways when the hydraulic oil flows through the P3 port, the blowout prevention box selection electromagnetic valve b3-12 is in a normally closed position, and the blowout prevention box selection electromagnetic valve a3-11 is in a normally open position;

When the electromagnet b of the blowout prevention box selection electromagnetic valve b3-12 is in power failure, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve b3-12 are normally closed, an oil circuit is not communicated, the electromagnet a of the blowout prevention box selection electromagnetic valve a3-11 is in power failure, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve a3-11 are normally communicated, liquid flow flows through the blowout prevention box selection electromagnetic valve a3-11, enters from the 1 port of the blowout prevention box selection electromagnetic valve a3-11, flows out from the 2 port of the blowout prevention box selection electromagnetic valve a3-11, enters into the P port of the blowout prevention box one clamping and releasing electromagnetic valve a3-5 and the P port of the blowout prevention box one clamping and releasing electromagnetic valve b3-3 respectively for standby, and the on-off control of the electromagnet a of the blowout prevention box one clamping and releasing electromagnetic valve a3-5 and the electromagnet b of the blowout prevention box one clamping and releasing electromagnetic valve b3-3 is realized, so that the clamping and releasing control of the corresponding blowout prevention box one 1-4 is realized;

when the electromagnet b of the blowout prevention box selection electromagnetic valve b3-12 is electrified, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve b3-12 are normally electrified, the electromagnet a of the blowout prevention box selection electromagnetic valve a3-11 is electrified, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve a3-11 are normally closed, an oil way is not electrified, liquid flow flows through the blowout prevention box selection electromagnetic valve b3-12, enters from the 1 port of the blowout prevention box selection electromagnetic valve b3-12, flows out from the 2 port of the blowout prevention box selection electromagnetic valve b3-12, respectively enters into the P port of the blowout prevention box second clamping and releasing electromagnetic valve b3-8 and the P port of the blowout prevention box second clamping and releasing electromagnetic valve a 3-10 for standby, and the clamping and releasing control of the blowout prevention box second clamping and releasing electromagnetic valve b3-8 and the electromagnet a of the blowout prevention box second clamping and releasing electromagnetic valve a 3-10 is realized through on-off control of the blowout prevention box second clamping and releasing electromagnetic valve b 3-10.

In this embodiment: the valve block main body (oil block) is a HX-001 series valve block manufactured by Sun company of America. The quick clamping electromagnetic valve a of the blowout prevention box and the selection electromagnetic valve a of the blowout prevention box are two-position two-way electromagnetic valves a, and are DTAF-a series valve groups produced by the United states solar company. The second quick clamping electromagnetic valve b of the blowout prevention box and the selection electromagnetic valve b of the blowout prevention box are two-position two-way electromagnetic valves b, and are DTAF-b series valve groups produced by the United states solar company. The first check valve and the second check valve are CXDA series valve groups manufactured by Sun America. The first clamping and loosening electromagnetic valve a of the blowout prevention box and the second clamping and loosening electromagnetic valve a of the blowout prevention box are electromagnetic reversing valve ball valves A, and are WFL-A series valve groups produced by Hedefus corporation. The first clamping and loosening electromagnetic valve B of the blowout prevention box and the second clamping and loosening electromagnetic valve B of the blowout prevention box are electromagnetic reversing valve ball valves B, and are WFL-B series valve groups produced by Hedefus corporation.

The traditional pressing and loosening modes of the blowout prevention box adopt a hydraulic control reversing valve, the invention adopts four electromagnetic reversing valve ball valves to carry out combination and collocation, and the electromagnetic reversing valve ball valves are electric control valves, and cut off oil ways by means of spherical or conical surface sealing, so that no leakage in all working pressure ranges can be realized, and the blowout prevention box has good sealing performance, can realize no leakage, is particularly suitable for micro-feeding and pressure maintaining requiring systems, and is suitable for a pressing and loosening control loop of a blowout prevention box rubber core. When the whole system is powered off, the working state of the blowout prevention box executing mechanism controlled by the valve group is still kept at the working position.

Claims

1. An electro-hydraulic integrated valve group structure for controlling a duplex blowout prevention box, which is characterized in that: the anti-blowout box electrohydraulic integrated valve comprises a pressure compensation variable pump (1-1), a speed regulation valve group (1-2), a duplex anti-blowout box electrohydraulic integrated valve group (1-3), an anti-blowout box I (1-4) and an anti-blowout box II (1-5), wherein the pressure compensation variable pump (1-1) is connected with the speed regulation valve group (1-2) and then is divided into two paths, and a P1 port and a P2 port of the duplex anti-blowout box electrohydraulic integrated valve group (1-3) are respectively connected;

the duplex blowout prevention box electrohydraulic integrated valve group (1-3) comprises a valve group main body (3-0) and a blowout prevention box I quick clamping electromagnetic valve a (3-1), a one-way valve I (3-2), a blowout prevention box I clamping and loosening electromagnetic valve b (3-3), a blowout prevention box I clamping and loosening electromagnetic valve a (3-5), a blowout prevention box II quick clamping electromagnetic valve b (3-6), a one-way valve II (3-7), a blowout prevention box II clamping and loosening electromagnetic valve b (3-8) and a blowout prevention box II clamping and loosening electromagnetic valve a (3-10) which are integrally inserted on the valve group main body (3-0);

the port P1 is sequentially communicated with a quick clamping electromagnetic valve a (3-1), a one-way valve A (3-2), a clamping and loosening electromagnetic valve b (3-3) of the first blowout prevention box and a rodless cavity of the first blowout prevention box (1-4), a rod cavity of the first blowout prevention box (1-4) is sequentially communicated with a clamping and loosening electromagnetic valve a (3-5) of the first blowout prevention box, a port T of an electrohydraulic integrated valve group (1-3) of the duplex blowout prevention box and a hydraulic oil tank to form an oil circuit of the first blowout prevention box, and the clamping and loosening control of the first blowout prevention box (1-4) is realized by controlling the power-on and power-off operation of the quick clamping electromagnetic valve a (3-1) of the first blowout prevention box, the clamping and loosening electromagnetic valve b (3-3) of the first blowout prevention box and the clamping and loosening electromagnetic valve a (3-5) of the first blowout prevention box;

The P2 port is sequentially communicated with a quick clamping electromagnetic valve b (3-6), a one-way valve II (3-7), a clamping and loosening electromagnetic valve b (3-8) of the second blowout prevention box and a rodless cavity of the second blowout prevention box (1-5), a rod cavity of the second blowout prevention box (1-5) is sequentially communicated with a clamping and loosening electromagnetic valve a (3-10) of the second blowout prevention box, a T port of an electrohydraulic integrated valve group (1-3) of the duplex blowout prevention box and a hydraulic oil tank to form a second blowout prevention box oil path, and a through hole controls the quick clamping electromagnetic valve b (3-6), the clamping and loosening electromagnetic valve b (3-8) of the second blowout prevention box and the clamping and loosening electromagnetic valve a (3-10) of the second blowout prevention box in the duplex blowout prevention box electrohydraulic integrated valve group (1-3) to obtain electric and de-electric actions, and control the conduction of the second blowout prevention box oil path, so that the clamping and loosening control of the second blowout prevention box (1-5) is realized.

2. The electrohydraulic integrated valve assembly structure for controlling a duplex blowout preventer as set forth in claim 1, wherein: the hydraulic integrated valve group (1-3) of the duplex blowout prevention box further comprises a blowout prevention box selection electromagnetic valve a (3-11) and a blowout prevention box selection electromagnetic valve b (3-12) which are integrally inserted on a valve group main body (3-0), the rear end of the P3 port is connected with the blowout prevention box selection electromagnetic valve a (3-11) and the blowout prevention box selection electromagnetic valve b (3-12) in parallel, the blowout prevention box selection electromagnetic valve a (3-11) is communicated with a rod cavity of the blowout prevention box one (1-4) through a clamping and loosening electromagnetic valve a (3-5) of the blowout prevention box one, and the blowout prevention box selection electromagnetic valve a (3-11) is communicated with a rodless cavity of the blowout prevention box one (1-4) through a clamping and loosening electromagnetic valve b (3-3) of the blowout prevention box one; the blowout prevention box selection electromagnetic valve b (3-12) is communicated with the rodless cavity of the blowout prevention box II (1-5) through the blowout prevention box II clamping and loosening electromagnetic valve b (3-8), and the blowout prevention box selection electromagnetic valve b (3-12) is communicated with the rod cavity of the blowout prevention box II (1-5) through the blowout prevention box II clamping and loosening electromagnetic valve a (3-10);

The hydraulic oil of a pneumatic liquid booster pump (1-6) enters a P3 port of an electrohydraulic integrated valve group (1-3) of the duplex blowout prevention box, when an electromagnet b of a blowout prevention box selection electromagnetic valve b (3-12) is in power failure, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve b (3-12) are normally closed, an oil way is not communicated, the electromagnet a of the blowout prevention box selection electromagnetic valve a (3-11) is in power failure, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve a (3-11) are normally communicated, the hydraulic oil flows through the blowout prevention box selection electromagnetic valve b (3-12), enters from the 1 port of the blowout prevention box selection electromagnetic valve a (3-11), and is separated into two paths after flowing out from the 2 port of the blowout prevention box selection electromagnetic valve a, and enters a P port of the blowout prevention box one clamping and releasing electromagnetic valve a (3-5) and a P port of the blowout prevention box one clamping and releasing electromagnetic valve b (3-3) respectively, and the electromagnet a of the blowout prevention box one clamping and releasing electromagnetic valve a (3-5) and the electromagnet b of the blowout prevention box one clamping and releasing electromagnetic valve b (3-3) are controlled to realize the corresponding control of the blowout prevention box one and blowout prevention box one clamping and one and releasing (1-4; when the electromagnet b of the blowout prevention box selection electromagnetic valve b (3-12) is electrified, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve b (3-12) are always electrified, the electromagnet a of the blowout prevention box selection electromagnetic valve a (3-11) is electrified, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve a (3-11) are normally closed, an oil way is not electrified, hydraulic oil flows through the blowout prevention box selection electromagnetic valve b (3-12), the hydraulic oil enters from the 1 port of the blowout prevention box selection electromagnetic valve b (3-12), the 2 port of the blowout prevention box selection electromagnetic valve b is divided into two paths after flowing out, and the two paths enter into the P port of the blowout prevention box second clamping and releasing electromagnetic valve b (3-8) and the P port of the blowout prevention box second clamping and releasing electromagnetic valve a (3-10) respectively for standby, and the on-off control of the electromagnet b of the blowout prevention box second clamping and releasing electromagnetic valve b (3-8) and the electromagnet a of the blowout prevention box second clamping and releasing electromagnetic valve a (3-10) is realized.

3. The electrohydraulic integrated valve assembly structure for controlling a duplex blowout preventer as set forth in claim 2, wherein: the first quick clamping electromagnetic valve a (3-1) of the blowout prevention box, the second quick clamping electromagnetic valve b (3-6) of the blowout prevention box, the selection electromagnetic valve a (3-11) of the blowout prevention box and the selection electromagnetic valve b (3-12) of the blowout prevention box are two-position two-way electromagnetic valves.

4. The electrohydraulic integrated valve assembly structure for controlling a duplex blowout preventer as set forth in claim 2, wherein: the blowout prevention box I clamping and loosening electromagnetic valve b (3-3), the blowout prevention box I clamping and loosening electromagnetic valve a (3-5), the blowout prevention box II clamping and loosening electromagnetic valve b (3-8) and the blowout prevention box II clamping and loosening electromagnetic valve a (3-10) are all zero-leakage electromagnetic reversing ball valves.

5. The use method of the electrohydraulic integrated valve group structure for controlling the duplex blowout preventer according to any one of claims 2 to 4 is characterized in that: the hydraulic oil provided by the pressure compensation variable pump (1-1) enters the speed regulating valve group (1-2), is divided into two paths after being subjected to speed regulation and flow division by the speed regulating valve group (1-2), and respectively enters the P1 port and the P2 port of the double-joint blowout prevention box electrohydraulic integrated valve group (1-3) to form the following loop;

(1) quick compacting loop of blowout prevention box:

When the electromagnet b of the first blowout prevention box clamping and releasing electromagnetic valve b (3-3) and the electromagnet a of the first blowout prevention box clamping and releasing electromagnetic valve a (3-5) are simultaneously powered off, the oil cylinder of the first blowout prevention box (1-4) is positioned at a quick compression position;

when hydraulic oil enters the port P1, the electromagnet a of the quick clamping electromagnetic valve a (3-1) of the blowout prevention box is controlled to be electrified, the quick clamping electromagnetic valve a (3-1) of the blowout prevention box is commutated, at the moment, liquid flow enters the port 1 of the quick clamping electromagnetic valve a (3-1) of the blowout prevention box from the port P1, then flows out from the port 2 of the quick clamping electromagnetic valve a (3-1) of the blowout prevention box, enters the one-way valve (3-2), the liquid flow overcomes the pre-tightening force of the spring of the one-way valve (3-2), the liquid flow channel of the one-way valve (3-2) is opened, the P port of the one-way valve b (3-3) is ready, the electromagnet b of the one-way valve b (3-3) is in standby state, at the moment, the electromagnet b of the one-way valve b (3-3) is in a power-off state, the one-way valve b (3-3) is operated at the left position by means of the pre-tightening force of the spring, the P port of the one-way valve b (3-3) is always communicated with the port A, the liquid flow passes through the one-way valve b (3-3) of the one-3) of the blowout prevention box, the electro-magnetic valve b (3-3) enters the pre-5) of the electromagnet b (4) is in a state, the state of the electro-magnetic valve (5) is in which is in a pre-tightening state, the electromagnet b (4) is in a cavity (5) is in a state, the electro-valve is in a state in the electro-valve is in the state, the electro-valve (4 is in the electro-valve is in a state, the anti-spraying box I clamping and loosening electromagnetic valve a (3-5) works at the right position, the opening A of the anti-spraying box I clamping and loosening electromagnetic valve a (3-5) is always communicated with the opening T, hydraulic oil with a rod cavity of the anti-spraying box I (1-4) flows through the opening A of the anti-spraying box I clamping and loosening electromagnetic valve a (3-5), then enters the opening T of the double-joint anti-spraying box electrohydraulic integrated valve group (1-3) through the opening T of the anti-spraying box I clamping and loosening electromagnetic valve a (3-5), and flows back to a hydraulic oil tank, and the circulation realizes the quick compression loop circulation of the anti-spraying box I;

(2) Quick release circuit for blowout prevention box:

when the electromagnet b of the first blowout prevention box clamping and releasing electromagnetic valve b (3-3) and the electromagnet a of the first blowout prevention box clamping and releasing electromagnetic valve a (3-5) are simultaneously powered on, the oil cylinder of the first blowout prevention box (1-4) is in a quick releasing position;

when hydraulic oil enters the port P1, the electromagnet a of the quick clamping electromagnetic valve a (3-1) of the blowout prevention box is controlled to be electrified, the electromagnet a (3-1) of the quick clamping electromagnetic valve a (3-3) of the blowout prevention box is commutated, at the moment, liquid flow enters the port 1 of the quick clamping electromagnetic valve a (3-1) of the blowout prevention box from the port P1, then flows out of the port 2 of the quick clamping electromagnetic valve a (3-1) of the blowout prevention box, enters the one-way valve (3-2), the liquid flow overcomes the spring pretightening force of the one-way valve a (3-2), the liquid flow channel of the one-way valve a (3-2) is opened, the electromagnet b (3-3) of the blowout prevention box is operated to be electrified, the electromagnet b (3-3) of the blowout prevention box is operated, the blowout prevention box b (3-3) is commutated, at the moment, the outlet of the one-way valve a (3-2) of the one-3) is separated into two channels, the P ports of the one-3 is closed, one-way valve b (3-5) is closed, the other electromagnetic valve b (3-5) is operated to be not electrified, the electromagnet b (3-3) is operated to be electrified, the electromagnet a is not electrified, the electromagnet b (3-3) is not electrified, the electromagnetic valve a is operated to be the one-5 is operated to be the blowout box, and the electromagnet a is not (3) is operated to be a) and the electromagnetic valve is opened, the P port and the A port of a clamping and loosening electromagnetic valve a (3-5) of the blowout prevention box are normally communicated, liquid flows through the A port through the P port of the clamping and loosening electromagnetic valve a (3-5) of the blowout prevention box, enters a rod cavity of the blowout prevention box I (1-4), return oil of a rodless cavity of the blowout prevention box I (1-4) enters the A port of a clamping and loosening electromagnetic valve b (3-3) of the blowout prevention box I for standby, at the moment, the clamping and loosening electromagnetic valve b (3-3) of the blowout prevention box I works at the right position, the A port and the T port of the clamping and loosening electromagnetic valve b (3-3) of the blowout prevention box I are normally communicated, liquid flows through the T port through the A port of the clamping and loosening electromagnetic valve b (3-3) of the blowout prevention box I, flows back to the hydraulic oil tank, and the circulation realizes quick loosening loop circulation of the blowout prevention box I (1-4);

(3) Blowout prevention box one middle position floating loop

When the electromagnet b of the electromagnetic valve b (3-3) is powered on, and the electromagnet a of the electromagnetic valve a (3-5) is powered off, the oil cylinder of the first blowout prevention box is in a floating middle position;

when the electromagnet a of the blowout prevention box I clamping and loosening electromagnetic valve a (3-5) is in a power failure, the blowout prevention box I clamping and loosening electromagnetic valve a (3-5) is in an initial position, an A port and a T port of the blowout prevention box I clamping and loosening electromagnetic valve a (3-5) are communicated, and rod cavity liquid flow of the blowout prevention box I (1-4) flows through the A port and the T port of the blowout prevention box I clamping and loosening electromagnetic valve a (3-5) and flows back to a hydraulic oil tank through the T port of the duplex blowout prevention box electrohydraulic integrated valve group (1-3);

at the moment, an electromagnet b of a clamping and loosening electromagnetic valve b (3-3) of the blowout prevention box I is electrified, the clamping and loosening electromagnetic valve b (3-3) of the blowout prevention box I is reversed, an A port of the clamping and loosening electromagnetic valve b (3-3) of the blowout prevention box I is communicated with a T port, and at the moment, liquid flow of a rodless cavity of the blowout prevention box I (1-4) flows through the A port and the T port of the clamping and loosening electromagnetic valve b (3-3) of the blowout prevention box I and flows back to a hydraulic oil tank through the T port of an electro-hydraulic integrated valve group (1-3) of the duplex blowout prevention box;

the rod cavity and the rodless cavity of the blowout prevention box I (1-4) are communicated with the hydraulic oil tank, and the clamping oil cylinder of the blowout prevention box I (1-4) is in a floating neutral position state;

(4) And a second quick compression loop of the blowout prevention box:

when the electromagnet b of the second blowout prevention box clamping and releasing electromagnetic valve b (3-8) and the electromagnet a of the second blowout prevention box clamping and releasing electromagnetic valve a (3-10) are simultaneously powered off, the oil cylinder of the second blowout prevention box (1-5) is positioned at a quick compression position;

when hydraulic oil enters the P2 port, the electromagnet b of the second quick clamping electromagnetic valve b (3-6) of the blowout prevention box is controlled to be electrified, the second quick clamping electromagnetic valve b (3-6) of the blowout prevention box is reversed, liquid flow enters the 1 port of the second quick clamping electromagnetic valve b (3-6) of the blowout prevention box from the P2 port and flows out of the 2 port of the second quick clamping electromagnetic valve b (3-6) of the blowout prevention box, enters the second one-way valve (3-7), the liquid flow overcomes the spring pretightening force of the second one-way valve (3-7), the liquid flow passage of the second one-way valve (3-7) is opened, the P port of the second clamping releasing electromagnetic valve b (3-8) of the blowout prevention box is in standby, the electromagnet b of the second clamping releasing electromagnetic valve b (3-8) of the blowout prevention box is in power-off, in the initial state, the second clamping and loosening electromagnetic valve b (3-8) of the blowout prevention box works at the left position by means of the pre-tightening force of a spring, the P port and the A port of the second clamping and loosening electromagnetic valve b (3-8) of the blowout prevention box are normally communicated, liquid flows through the A port of the second clamping and loosening electromagnetic valve b (3-8) of the blowout prevention box and enters a rodless cavity of the second blowout prevention box (1-5), oil return of a rod cavity of the second blowout prevention box (1-5) enters the A port of the second clamping and loosening electromagnetic valve a (3-10) of the blowout prevention box to stand by, at the moment, the electromagnet a of the second clamping and loosening electromagnetic valve a (3-10) of the blowout prevention box loses power by means of the pre-tightening force of the spring, the anti-spraying box II clamping and loosening electromagnetic valve a (3-10) works at the right position, the opening A of the anti-spraying box II clamping and loosening electromagnetic valve a (3-10) is normally communicated with the opening T, hydraulic oil with a rod cavity of the anti-spraying box II (1-5) flows through the opening A of the anti-spraying box II clamping and loosening electromagnetic valve a (3-10), then enters the opening T of the double-joint anti-spraying box electrohydraulic integrated valve group (1-3) through the opening T of the anti-spraying box II clamping and loosening electromagnetic valve a (3-10), and flows back to a hydraulic oil tank, and the circulation realizes the quick compression loop circulation of the anti-spraying box I;

(5) And a second quick release loop of the blowout prevention box:

when the electromagnet b of the second clamping and loosening electromagnetic valve b (3-8) of the blowout prevention box and the electromagnet a of the second clamping and loosening electromagnetic valve a (3-10) of the blowout prevention box are simultaneously powered on, the oil cylinder of the second clamping and loosening electromagnetic valve a (1-5) of the blowout prevention box is positioned at a quick loosening position;

when hydraulic oil enters the P2 port, the electromagnet b of the second quick clamping electromagnetic valve b (3-6) of the blowout prevention box is controlled to be electrified, the second quick clamping electromagnetic valve b (3-6) of the blowout prevention box is controlled to change direction, at the moment, liquid flow enters the 1 port of the second quick clamping electromagnetic valve b (3-6) of the blowout prevention box from the P2 port, then flows out of the 2 ports of the second quick clamping electromagnetic valve b (3-6) of the blowout prevention box, enters the second one-way valve (3-7), the liquid flow overcomes the spring pretightening force of the second one-way valve (3-7), the liquid flow passage of the second one-way valve (3-7) is opened, the liquid flow enters the P port of the second clamping and loosening electromagnetic valve b (3-8) of the blowout prevention box, at the moment, the electromagnet b of the second clamping and loosening electromagnetic valve b (3-8) of the blowout prevention box is operated, the two clamping and loosening electromagnetic valves b (3-8) of the blowout prevention box are electrified, at the moment, the outlet of the two one-way valve (3-7) is divided into two paths, as the P port of the two clamping and loosening electromagnetic valves b (3-8) of the blowout prevention box is closed, one path is not communicated with the P port oil path of the two clamping and loosening electromagnetic valves b (3-8) of the blowout prevention box, the other path enters the P port of the two clamping and loosening electromagnetic valves a (3-10) of the blowout prevention box, at the moment, the electromagnet a of the two clamping and loosening electromagnetic valves a (3-10) of the blowout prevention box is operated to electrify, the two clamping and loosening electromagnetic valves a (3-10) of the blowout prevention box are commutated, the two clamping and loosening electromagnetic valves a (3-10) of the blowout prevention box work at the left position, the P port and the A port of a blowout prevention box II clamping and loosening electromagnetic valve a (3-10) are normally communicated, liquid flows through the A port through the P port of the blowout prevention box II clamping and loosening electromagnetic valve a (3-10) to enter a rod cavity of a blowout prevention box II (1-5), return oil of a rodless cavity of the blowout prevention box II (1-5) enters the A port of a blowout prevention box II clamping and loosening electromagnetic valve b (3-8) to stand by, at the moment, the blowout prevention box II clamping and loosening electromagnetic valve b (3-8) works at the right position, the A port and the T port of the blowout prevention box II clamping and loosening electromagnetic valve b (3-8) are normally communicated, liquid flows through the A port of the blowout prevention box II clamping and loosening electromagnetic valve b (3-8) to flow through the T port to enter the T port of the duplex blowout prevention box electrohydraulic integrated valve set (1-3), and the circulation loop is returned to the hydraulic oil tank, and the loop is fast released by the loop circulation of the blowout prevention box II (1-5);

(6) Blowout prevention box two middle position floating loop

When the electromagnet b of the second blowout prevention box clamping and releasing electromagnetic valve b (3-8) is powered on, the electromagnet a of the second blowout prevention box clamping and releasing electromagnetic valve a (3-10) is powered off, and the oil cylinder of the second blowout prevention box is in a floating middle position;

when the electromagnet a of the blowout prevention box II clamping and loosening electromagnetic valve a (3-10) is in a power failure, the blowout prevention box II clamping and loosening electromagnetic valve a (3-10) is in an initial position, an A port and a T port of the blowout prevention box II clamping and loosening electromagnetic valve a (3-10) are communicated, and a rod cavity liquid flow of the blowout prevention box II (1-5) flows through the A port and the T port of the blowout prevention box II clamping and loosening electromagnetic valve a (3-10) and flows back to a hydraulic oil tank through the T port of the duplex blowout prevention box electrohydraulic integrated valve group (1-3);

at the moment, an electromagnet b of a second clamping and loosening electromagnetic valve b (3-8) of the blowout prevention box is electrified, the second clamping and loosening electromagnetic valve b (3-8) of the blowout prevention box is reversed, an A port of the second clamping and loosening electromagnetic valve b (3-8) of the blowout prevention box is communicated with a T port, and at the moment, liquid flow of a rodless cavity of the second clamping and loosening electromagnetic valve b (3-8) of the blowout prevention box flows back to a hydraulic oil tank through the A port and the T port of the electro-hydraulic integrated valve group (1-3) of the duplex blowout prevention box;

the rod cavity and the rodless cavity of the second blowout prevention box (1-5) are communicated with the hydraulic oil tank, and the clamping oil cylinder of the second blowout prevention box (1-5) is in a floating neutral position state.

6. The method for using the electrohydraulic integrated valve group structure for controlling a duplex blowout preventer according to claim 5, wherein the method is characterized in that:

when the equipment is in a deep well working condition, along with the continuous rising of the well pressure, the system pressure set by the pressure compensation variable pump (1-1) is insufficient to ensure the clamping and sealing of the first rubber core of the blowout prevention box and the second rubber core of the blowout prevention box, at the moment, the pneumatic liquid booster pump (1-6) needs to be independently operated, hydraulic oil output by the pneumatic liquid booster pump (1-6) enters through the P3 port of the double blowout prevention box electrohydraulic integrated valve group (1-3), and when the hydraulic oil flows through the P3 port, the hydraulic oil enters into the blowout prevention box selection electromagnetic valve a (3-11) and the blowout prevention box selection electromagnetic valve b (3-12) in two ways, the blowout prevention box selection electromagnetic valve b (3-12) is in a normally closed position, and the blowout prevention box selection electromagnetic valve a (3-11) is in a normally open position;

when the electromagnet b of the blowout prevention box selection electromagnetic valve b (3-12) is in power failure, the opening 1 and the opening 2 of the blowout prevention box selection electromagnetic valve b (3-12) are normally closed, an oil way is not communicated, the electromagnet a of the blowout prevention box selection electromagnetic valve a (3-11) is in power failure, the opening 1 and the opening 2 of the blowout prevention box selection electromagnetic valve a (3-11) are normally communicated, liquid flows through the blowout prevention box selection electromagnetic valve a (3-11), flows from the opening 1 of the blowout prevention box selection electromagnetic valve a (3-11), flows out of the opening 2 of the blowout prevention box selection electromagnetic valve a (3-11), and respectively enters the opening P of the blowout prevention box clamping and releasing electromagnetic valve a (3-5) and the opening P of the blowout prevention box clamping and releasing electromagnetic valve b (3-3) to standby, and the on-off control of the electromagnet a of the blowout prevention box clamping and releasing electromagnetic valve a (3-5) and the electromagnet b (3-3) is realized, so that the clamping and releasing control of the corresponding blowout prevention box A (1-4) is realized;

When the electromagnet b of the blowout prevention box selection electromagnetic valve b (3-12) is electrified, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve b (3-12) are always electrified, the electromagnet a of the blowout prevention box selection electromagnetic valve a (3-11) is electrified, the 1 port and the 2 port of the blowout prevention box selection electromagnetic valve a (3-11) are normally closed, an oil way is not electrified, liquid flows through the blowout prevention box selection electromagnetic valve b (3-12), flows from the 1 port of the blowout prevention box selection electromagnetic valve b (3-12), flows out from the 2 port of the blowout prevention box selection electromagnetic valve b (3-12), respectively enters the P port of the blowout prevention box second clamping and releasing electromagnetic valve b (3-8) and the P port of the blowout prevention box second clamping and releasing electromagnetic valve a (3-10) to standby, and the on-off control of the electromagnet b of the blowout prevention box second clamping and releasing electromagnetic valve b (3-8) and the electromagnet a of the blowout prevention box second clamping and releasing electromagnetic valve a (3-10) is realized.