Assistance type pin type back-pressure control method and back-pressure valve thereof

A back pressure valve and power-assisted technology, applied in valve details, safety valves, balance valves, etc., can solve the problems of high experimental cost, high diaphragm replacement rate, high diaphragm material requirements, and achieve enhanced operational stability and control high precision effect

Active Publication Date: 2012-12-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high requirements on the material of the diaphragm also result in a high replacement rate of the diaphragm and high experimental costs
[0006] The above two back pressure cont

Method used

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  • Assistance type pin type back-pressure control method and back-pressure valve thereof
  • Assistance type pin type back-pressure control method and back-pressure valve thereof
  • Assistance type pin type back-pressure control method and back-pressure valve thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Embodiment 1

[0030] See the flow of the back pressure control system for the displacement experiment figure 1 As shown, the back pressure control system includes a back pressure valve A, a back pressure controller B and a meter C. The back pressure valve A has a liquid inlet and a liquid outlet, the liquid outlet of the back pressure valve A is connected to a meter C, and the end of the back pressure valve A away from the liquid outlet is connected to a back pressure controller B. The fluid D generated in the displacement process enters the back pressure valve A through the liquid inlet; at this time, the back pressure controller B adjusts according to the difference between the set value and the pressure of the produced fluid. If the fluid pressure is high, the pressure of the control part is reduced to make a small amount The fluid enters the meter C along the liquid outlet; when the fluid pressure is lower than the set value, the controller pressurizes and the passage...

Example Embodiment

[0041] Embodiment 2

[0042] Such as Figure 2 to Figure 7 As shown, the embodiment of the present invention proposes a power-assisted needle-type back pressure control method, which includes the following steps:

[0043] A. Provide the back pressure valve A in the above embodiment;

[0044] B. Connect the back pressure controller B to the back pressure valve A through the interface 1b of the back pressure valve A, and set the back pressure pressure setting value on the back pressure controller B;

[0045] C. The fluid generated during the displacement process is injected into the right side of the piston 3a of the back pressure valve through the liquid inlet 2c;

[0046] D. The back pressure controller B adjusts according to the difference between the set value and the pressure of the injected fluid. If the injected fluid pressure is higher than the set value, the two sides of the piston 3a will be affected by the pressure difference and the assistance of the spring. The needle plug ...

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PUM

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Abstract

The invention discloses an assistance type pin type back-pressure control method and a back-pressure valve thereof. The back-pressure valve comprises a valve body, a sealing cover and a pin type plug, wherein the valve body is provided with a U-shaped valve wall. The right end of the valve wall is provided with an opening, the left end of the valve wall is provided with a connector, and a cavity is arranged in the valve wall. The sealing cover is connected to the right end of the valve body, a pin channel and a liquid outlet which are communicated with each other are arranged in the sealing cover, the liquid outlet is located at the right end of the pin channel, and a liquid inlet is arranged on the upper side of the sealing cover and communicated with the pin channel. The pin type plug can be connected into the cavity of the valve body in a side-to-side moving mode and is provided with a piston, the right end of the piston is sequentially connected with a pin rod and a cone-shaped pin tip, and the piston is in sealing connection into the cavity. The left end and the right end of the piston are respectively provided with a spring, the pin rod is movably located in the pin channel, and the front portion of the pin tip is inserted into the liquid outlet to form sealing when the back-pressure valve is in a closed state.

Description

technical field [0001] The invention relates to a method for controlling a power-assisted needle type back pressure and a back pressure valve thereof. Background technique [0002] Back pressure control is a method often used in oil and gas development experiments, especially in oil displacement experiments simulating high temperature and high pressure conditions in reservoirs. Controlling the stable pressure state at the production end is a necessary condition for the normal operation of the experiment. Affected by the type of experimental design, the period of some displacement experiments is as long as 1 to 2 months. During the experiment period, the back pressure control must be stable and effective. A short-term control failure can cause large fluctuations in the pressure in the model, which may easily lead to the failure of the overall experiment. stop. [0003] At present, there are two methods of back pressure control, one is spring type needle valve control; the ot...

Claims

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Application Information

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IPC IPC(8): F16K17/04F16K17/164F16K41/02
Inventor 陈兴隆秦积舜李实李军俞宏伟张可
Owner PETROCHINA CO LTD
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