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

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...

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 control methods limit the smooth progress of the development experiment, so it is necessary to develop a back pressure valve with high test accuracy and better operational stability

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