CN202031536U - Novel control system of well-mouth safety valve - Google Patents

Abstract

The utility model discloses a novel control system of a well-mouth safety valve, which comprises an energy accumulator, an oil supply loop and a control loop, wherein the energy accumulator is connected with a stop valve; the oil supply loop comprises an oil tank; the oil tank is connected with a plunger pump through a check valve; the plunger pump is connected with the stop valve of the energy accumulator through two check valves; the control loop comprises a motor connected with the plunger pump and a motor controller connected with the motor; the motor controller and the stop valve of the energy accumulator are connected; a pressure gauge and a hand-operated direction valve are sequentially connected with a pipeline between the check valve of the oil supply loop and the stop valve of the energy accumulator; the hand-operated direction valve is connected with the safety valve through the stop valve; and the pressure gauge is connected between the stop valve and the safety valve. The novel control system does not rely on compressed air so as to simplify the structure of the system; and the novel control system has more reliable performance and longer service life, is more convenient in maintenance and suitable for more extensive occasions of production operation, and can work normally particularly under the mal-condition with an extremely low temperature.

Description

The new wellhead valve control system

FIELD

[0001] The present invention relates to an oil or gas extraction device, in particular it relates to a novel valve control system wellhead.

Background technique

[0002] Currently, the safety valve opening pressure of the vast majority of China's domestic oil and gas wells northwest at about 15000 psi (lOOMPa), it has a conventional hydraulic devices used in the device, it can only reach a maximum operating pressure of 5000 psi (35MPa), not meet the requirements. Field natural gas due to the use of high concentrations of explosive situations, to achieve the required level of proof MD II BT4 above, it means there is employed an electric pump and an electromagnetic valve, the system will heat up and work easily, and a spark, the presence of a serious security risk, and only on the ground prior art valve control, and can not be controlled subsurface safety valves. Takes a long time to maintain the production of oil and gas wells wells open state, so that the high requirements on regulated wellhead valve control means, it has a control valve means is a spool valve structure, the amount of leakage is too large when unattended maintain normal production of oil and gas wells. When mining oil and gas pipeline pressure fluctuation exceeds a preset range, the control system should be immediately shut in the well safety valve, to prevent accidents. It can not be achieved with a device in the function.

[0003] In order to solve the above problem, Chinese patent number "200510089173.6" discloses a wellhead valve control system, which is filed on August 5, 2005, to February 7, 2007 Publication date. While solving the above problems part, but there is still insufficient patented technology: use of gas as a driving force booster pump apparatus, which structure is relatively complex, requires high supporting means, and the field must be compressed air as a power source. Long-term use of poor reliability, especially in low temperature environment is more obvious, can not meet the requirements of wellsite poor environment.

SUMMARY

[0004] The present invention aims to overcome the above-described problems of the conventional valve control system wellhead, the wellhead to provide a novel valve control system, the present invention is not dependent on compressed air, thereby simplifying the system structure, more reliable performance maintenance more convenient, longer life, suitable for the production of a wider range of workplace use, can also work especially at very low temperatures harsh conditions.

[0005] To achieve the above object, the present invention adopts the technical solution as follows:

[0006] A novel wellhead valve control system includes an accumulator, characterized in that: further comprising a supply circuit and a control circuit connected to the accumulator and the shut-off valve; said supply circuit comprises a tank, the tank passes through the check and the valve piston is connected, via two-way valve piston and the accumulator stop valve; said control circuit comprises a motor and a motor controller connected to the piston and connected with the motor, the motor controller shut-off valve is connected to the accumulator; shutoff valve on the line between the check valve and the oil supply circuit of the accumulator pressure gauge and further sequentially connected with a manual valve, the manual shut-off valve and the safety valve by a valve connected between the valve and the cut-off valve is also connected with a pressure gauge.

[0007] The present invention further includes a manual supply circuit, the supply circuit comprises a manual hand pump into the oil tank is connected to the end of the check valve and the intake side check valve connected to the oil, the oil pump via hand end of single connected to the line between the two check valves to the valve supply circuit.

[0008] The motor controller is further connected to a pressure switch, the motor controller is connected via shut-off valve with the pressure switch of the accumulator.

[0009] The shut-off valve between the accumulator and the manual valve has a shut-off valve is also connected through line.

[0010] The two-way valve between the oil supply circuit is also connected through line relief valve.

[0011] The present invention is advantageous in that:

[0012] First, the present invention includes a supply circuit and a control circuit connected to the accumulator and the shut-off valve; said supply circuit comprises a tank, the tank through a check valve connected to the piston, piston by two single cut-off valve is connected to the accumulator; said control circuit includes a motor and a plunger pump connected with the motor and a motor controller connected to the motor controller and the shut-off valve connected to the accumulator, the use of pressurized gas flooding as a conventional pump wellhead valve system for a power control device in comparison more reliable, easier maintenance, longer life, and thanks to the power supply as a power source, compressed air is no longer dependent on, thereby simplifying the system structure for the production of a wider range of workplace use, can also work especially at very low temperatures harsh conditions.

[0013] Second, the present invention, the motor controller is further connected to a pressure switch, the motor controller is connected via shut-off valve with accumulator pressure switch can be conveniently adjusted by the pressure switch size desired pressure, and increasing the reliability.

[0014] Third, the present invention further includes a manual supply circuit, the supply circuit comprises a manual hand pump into the oil tank is connected to the end of the check valve and the intake side check valve connected to the oil, the oil pump via the manual end of the one-way valve connected to a line between the supply circuit of the two check valves, manual pump as an auxiliary device of the system, in the system without power supply can be used to power the manual pump systems.

[0015] Fourth, the present invention, the shut-off valve on the line between the check valve and the accumulator in sequence the supply circuit is further connected with a pressure gauge and a manual valve, the manual shut-off valve and the safety valve by a valve connected between the valve and the cut-off valve is also connected with a pressure gauge, you can easily control the opening and closing valve surface, and the magnitude of the pressure may be visually displayed by the two pressure gauges, simple structure, convenient maintenance, reliable .

BRIEF DESCRIPTION

[0016] Figure 1 is a control schematic invention

[0017] FIG labeled: 1, a tank 2, the check valve A, 3, manual pump 4, the check valve B, 5, closing valves A, 6, an accumulator 7, a pressure gauge A, 8 , pressure gauge B, 9, valve 10, shutoff valve B, 11, a manual valve 12, shutoff valve C, 13, the check valve C, 14, relief valve 15, the check valve D, 16 , piston 17, pressure switch 18, the motor controller 19, the check valve E.

Detailed ways

[0018] A novel wellhead valve control system includes an accumulator, further comprising a supply circuit and a control circuit connected to the accumulator and the shut-off valve; said supply circuit comprises a tank, the tank via the check valve with the plunger connected to the pump cut-off valve connected to the piston accumulator through two-way valve; said control circuit comprises a motor and a motor controller connected to the piston and connected with the motor, the motor controller and accumulator cut-off valve is connected; shut-off valve on the line between the check valve and the oil supply circuit of the accumulator pressure gauge and further sequentially connected with a manual valve, the manual valve is connected through a shut-off valve and safety valve, closing It is also connected between the valve and the pressure gauge valve. The present invention is preferably isolated from the motor explosion-proof motor.

[0019] The present invention further includes a manual supply circuit, the supply circuit comprises a manual hand pump into the oil tank is connected to the end of the check valve and the intake side check valve connected to the oil, the oil pump via hand end of single connected to the line between the two check valves to the valve supply circuit. [0020] The present invention is a preferred embodiment, the motor controller is further connected to a pressure switch, the motor controller through the pressure switch with the shut-off valve connected to the accumulator.

[0021] The present invention is yet another preferred embodiment, shut-off valve is also connected through line between the shutoff valve and the manual valve to the accumulator.

[0022] The present invention is yet another preferred embodiment, the oil supply circuit between the two check valves is further connected via a line with a relief valve.

[0023] In the explosion-proof motor driven piston pump stored in the accumulator, the size of the required pressure can be adjusted by the oil pressure switch for the system, the system pressure. Wellhead valve in a normally open state, it is necessary to close by operating the manual valve can be implemented. By the size of the pressure gauge display. The system pressure is too high, the relief valve is operated by adjusting. Hand pump as an auxiliary device of the system, in the system without power supply from the system to power it.

[0024] When powered, motor driven working piston pump, the hydraulic oil tank accumulator injection to establish the system pressure. Pressure switch system pressure detected in real time, when the system pressure reaches the set value, the motor stops. When the system pressure is below the set value, the motor is automatically driven piston pump working hydraulic pressure is supplied to the system.

Claims (5)

A new wellhead valve control system includes an accumulator, characterized in that: further comprising a supply circuit and a control circuit connected to the accumulator and the shut-off valve; said supply circuit comprises a tank, the tank through a check valve and a plunger pump is connected, via two-way valve piston and the accumulator stop valve; and the motor controller comprises a control circuit connected to the motor and a plunger pump connected with the motor and the motor controller and storage shut-off valve is connected to the transducer; shut-off valve on the line between the check valve and the oil supply circuit of the accumulator pressure gauge and further sequentially connected with a manual valve, the manual shut-off valve and the safety valve through the valve connection between the valve and the cut-off valve is also connected with a pressure gauge.

2. New wellhead valve control system according to claim 1, characterized in that: further comprising a supply circuit manually, the manual feed oil supply circuit including an oil tank is connected to the end of the check valve and the intake end of the oil alone a manual valve connected to the pump, a hand pump connected to the line between the two check valves through the oil supply circuit side check valve.

The new wellhead valve control system according to claim 1, wherein: said motor controller is further connected to a pressure switch, the motor controller through the pressure switch with the shut-off valve connected to the accumulator.

The new wellhead valve control system according to claim 1, wherein: the cutoff valve between the accumulator and the manual valve is further connected via a line shut-off valve.

5. New wellhead valve control system as claimed in claim 4, wherein: the relief valve is further connected via a line between the two check valves in the oil supply circuit.