Method for rapidly evaluating capacity of gas storage reservoir in constant pressure water body

By calculating the effective trapped water body size and pressurization coefficient, and combining the gas injection and drainage of water body and rock compression, the compression coefficient was measured using fluid seepage tests. This solved the problem of the inability to accurately and quickly evaluate the storage capacity of gas storage facilities converted from constant-pressure water bodies, and enabled rapid and accurate storage capacity calculation.

CN115935578BActive Publication Date: 2026-05-01CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202111110067.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-09-22
Publication Date
2026-05-01
Estimated Expiration
2041-09-22

AI Technical Summary

Technical Problem

Existing technologies cannot accurately and quickly evaluate the storage capacity of gas storage facilities converted from constant-pressure water bodies, resulting in the inability to accurately assess the storage capacity during the screening process.

Method used

By calculating the effective trapped water body size and pressurization coefficient, combined with the gas injection and water displacement and rock compression, and using fluid seepage tests to measure the gas saturation and compressibility coefficient, the gas storage capacity that can be obtained by injecting gas to compress the rock and residual water can be calculated, thus achieving rapid and accurate storage capacity evaluation.

Benefits of technology

It provides a fast and accurate method for calculating storage capacity, solving the problem of inaccurate evaluation of storage capacity, and features fast calculation speed and few parameters.

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Abstract

This invention provides a method for rapidly evaluating the storage capacity of a gas storage facility converted from a constant-pressure water body. The method includes: Step 1, calculating the effective trap size and pressurization coefficient based on a geological assessment of the effective trap; Step 2, calculating the available gas storage capacity from gas injection and water displacement based on the assessment results of the effective trap size; Step 3, calculating the available gas storage capacity from gas injection and compression of rock and residual water based on the assessment results of the effective trap pressurization coefficient; and Step 4, calculating the storage capacity of the gas storage facility converted from the constant-pressure water body. This method provides highly accurate calculation results for the gas storage capacity of such facilities, enabling rapid evaluation and providing an accurate capacity calculation method for the preliminary evaluation of gas storage facilities converted from constant-pressure water bodies.
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