Automatic back pressure control device

Abstract

The invention relates to an automatic back pressure control device for an indoor thermal recovery simulation experiment of the petroleum industry and solves the problems that back pressure control is easy to be out of work, the success rate of an experiment is low, experimental data is inaccurate and an experimental operator can be burned or scalded easily in a back pressure control method adopted in the conventional thickened oil thermal recovery simulation experiment of the petroleum industry. The device consists of a double-diaphragm piston type back pressure valve, a temperature regulation and control device and an automatic back pressure tracking system. The automatic back pressure control device has the advantages of increasing the success rate of the experiment and the accuracy of the experimental data, along with safety, reliability and convenience in operation, and is mainly applied to the high-temperature steam driving indoor physical simulation experiment of the petroleum industry.

Description

Technical field [0001] The invention relates to a device for back pressure control, in particular to a back pressure automatic control device used in a physical simulation experiment of a high-temperature steam flooding chamber of a heavy oil reservoir in the petroleum industry. Background technique [0002] At present, in the physical simulation experiments involving back pressure in the petroleum industry, the control of the back pressure at the outlet of the displacement experiment process is mainly realized through the back pressure valve and the constant pressure pump, while in the simulation of the high temperature steam displacement experiment of the thermal recovery heavy oil reservoir The use of conventional back pressure control methods has a great impact on the success rate of experiments and the accuracy of data. In the initial stage of the steam flooding experiment, the fluid in the outlet pipeline was mainly crude oil. Due to the low initial temperature, the crude o...

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Problems solved by technology

[0002] At present, in the physical simulation experiments involving back pressure in the petroleum industry, the control of the outlet back pressure of the displacement experiment process is mainly realized through the back pressure valve and the constant pressure pump, while in the simulated thermal recovery heavy oil reservoir high temperature steam displacement experiment The use of conventional back pressure control methods has a great impact on the success rate of the experiment and the accuracy of the data

In the initial stage of the steam flooding experiment, the fluid in the outlet pipeline is mainly crude oil. Due to the low initial temperature and the high viscosity of the crude oil, it is easy to generate additional resistance, which leads to an increase in system pressure and changes in the displacement phase in the system. It is high-temperature hot water; and in the middle and late stages of displacement, since the fluid in the outlet pipeline is mainly high-temperature steam or high-temperature hot water, its viscosity is very small, and there is no problem of additional resistance in the pipeline, while the instability of the high-temperature and high-pressure steam state It makes it difficult for the control of the back pressure valve to meet the stability requirements, and the steam will be ejected from the outlet intermittently, which will cause the system pressure to drop instantaneously and the pressure fluctuation will affect the accuracy of the experimental data, and even the back pressure control will fail completely, resulting in the complete failure of the experiment

At the same time, since the experiment usually simulates a temperature as high as 350 ° C and a system back pressure as high as 20 MPa, this back pressure control method also has potential safety hazards of burns or scalds for the experimental operators

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