System and method for measuring drainage capacity parameter influencing water layer reconstruction gas storage

By simulating the drainage and expansion process of a water-layer gas storage facility, and using specialized measurement systems and methods, the lack of experimental research in water-layer gas storage facility conversion was solved, enabling precise measurement and optimization of drainage capacity parameters, and improving conversion efficiency and safety.

CN122084860APending Publication Date: 2026-05-26CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202411704798.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-26
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies lack comprehensive experimental studies on the conversion of water-bearing gas storage facilities, especially in critical stages such as depletion drainage, gas injection-pump drainage expansion, and gas injection-pump drainage expansion. This limits the accuracy of traditional methods in assessment, and there is an urgent need to analyze and evaluate the influencing factors of drainage capacity in the conversion of water-bearing gas storage facilities.

Method used

A system and method are provided for measuring parameters affecting the drainage capacity of a water-reconstructed gas storage reservoir. The system includes a core holder, an outlet back pressure and measurement device, a water injection and gas injection device, an inlet back pressure and measurement device, and a data processing device. By progressively reducing the pressure, the system measures the gas production and water production, calculates the dynamic recovery rate and dynamic expansion characteristics, simulates processes such as exhaustion drainage, gas injection-pump drainage, and gas injection huff and puff drainage, and optimizes the exhaustion lower limit pressure, gas injection rate, formation dip angle, and reservoir properties.

Benefits of technology

It enabled precise measurement of the drainage and expansion capacity and working gas volume of the water-reconstructed gas storage facility, optimized the depletion lower limit pressure, gas injection rate, formation dip angle and reservoir properties, provided design basis for the reconstruction of the gas storage facility, and improved reconstruction efficiency and safety.

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Abstract

The invention discloses a system and a method for measuring a parameter influencing the drainage capacity of a water layer reconstruction gas storage, and the system comprises a rock core holder which is used for accommodating an experiment rock core; the water injection device is used for saturating the experimental rock core by utilizing the contained experimental formation water; the outlet back pressure and measuring device is used for reducing the pressure of the outlet end of the rock core step by step so as to reduce the outlet pressure to a specified failure lower limit pressure; the gas injection device is used for performing gas drive on the rock core with the outlet pressure reaching the attenuation lower limit pressure; the inlet back pressure and measuring device is used for injecting gas into the inlet end of the rock core and then reducing the pressure of the inlet end of the rock core step by step, so that the gas production rate and the water production rate of each pressure point in the pressure reduction process are measured when the inlet pressure is reduced to a specified failure lower limit pressure; and the data processing device is used for calculating the dynamic recovery degree and the dynamic expansion characteristic according to the water yield and the gas yield of each pressure point.
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