Experimental method and experimental system of gas sealing performance of underground packer

Abstract

The invention discloses an experimental method and an experimental system of gas sealing performance of an underground packer, which can be used for verifying the gas sealing performance of an underground gas injecting packer. The experimental method is to mount an experimental simulation packer in a high-pressure cylinder; the high-pressure cylinder is positioned in a constant-temperature box; and the high-pressure cylinder and the constant-temperature box are connected with a sealing performance experimental system through a pressure test pipeline, a sealing pipeline and a gas leakage collecting pipeline for verifying the sealing performance of the experimental simulation packer in the high-pressure cylinder. The experimental system comprises a high-pressure gas source generation device, a leaked gas metering device and a control device; the pressure test pipeline and the sealing pipeline are both connected with the high-pressure gas source generation device; the gas leakage collecting pipeline is connected with the leaked gas metering device; the control device is respectively connected with a pressure sensor, a temperature sensor and a liquid level sensor through data wires; the experimental simulation packer is sealed by the high-pressure gas source generation device, and an actual underground high-pressure gas injecting environment can be simulated; and the result accords with the actual working condition better.

Description

technical field [0001] The invention relates to an experimental method and equipment for downhole tools in the petroleum industry, in particular to an experimental method and an experimental system for the gas sealing performance of downhole packers, which can be used to verify the gas sealing performance of downhole gas injection packers. Background technique [0002] In order to improve the recovery rate of oilfields and supplement formation energy, many low-permeability reservoirs have been developed by gas flooding. Some gas injection wells are arranged in the oilfields, and gas injection strings are used for gas injection production. The downhole gas injection string contains a gas injection packer, and rubber seals are used on the packer. The material and structure of the seal directly affect the sealing performance of the packer. The packer is installed in a well about 3,000 meters below the surface, the ambient temperature is about 125°C-145°C, and the pressure is ab...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defects of the existing experimental methods and equipment, the present invention provides an experimental method and experimental system for the gas sealing performance of downhole packers, which can simulate the downhole high temperature and high pressure gas environment, and use gas as the medium to test the sealing performance of the packer. And it can accurately measure the gas leakage rate, providing an exact solution for the structure optimization and material optimization of the seal

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