A method for evaluating effective working gas volume of gas storage

By monitoring the T2 spectrum signal intensity value of the core through nuclear magnetic resonance and combining it with simulated formation conditions, the error problem of working gas volume assessment during multiple injection and production processes in water-intrusive gas reservoirs was solved, achieving accurate working gas volume assessment and rational operation of the gas reservoir.

CN120925904BActive Publication Date: 2026-07-03PETROCHINA CO LTD
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Patent Information

Application Number
CN202410575571.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-05-10
Publication Date
2026-07-03
Estimated Expiration
2044-05-10

AI Technical Summary

Technical Problem

Existing technologies for evaluating the working gas volume of water-inundated gas reservoirs during multiple injection and production processes in underground gas storage facilities have errors. They fail to accurately reflect the impact of factors such as gas expansion, resulting in significant differences between the operating parameters and design parameters of the gas storage facilities, and the economic benefits do not meet expectations.

Method used

Nuclear magnetic resonance was used to monitor the T2 spectrum signal intensity values ​​of cores at the end of different gas injection and production stages. The T2 spectrum signal intensity values ​​reflected the changes in gas saturation in the cores. Combined with simulated formation conditions, an evaluation method for multiple injection and production cycles was established to obtain the working gas volume variation pattern.

Benefits of technology

It enables accurate assessment of the working gas volume of water-inundated gas storage facilities in multiple injection and production cycles, simplifies the assessment process, provides a basis for the rational operation of gas storage facilities, and improves the accuracy and safety of the assessment results.

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Abstract

This invention discloses a method for assessing the effective working gas volume of a gas storage facility, relating to the field of oil and gas field development. It includes: S1: basic signal acquisition; S2: simulated reservoir formation; S3: reservoir development; S4: gas injection into the storage facility; S5: gas production from the storage facility; S6: multiple injection and production cycles; and S7: assessment of effective working gas volume. This invention utilizes nuclear magnetic resonance (NMR) to monitor the T2 spectrum signal intensity values ​​of core samples at the end of different injection and production stages. The T2 spectrum signal intensity values ​​reflect changes in gas saturation within the core, and the gas content ratio at the end of production and injection stages is analyzed to obtain the change in working gas volume within the core over an injection-production cycle. This allows for a realistic and accurate reflection of the changing patterns of working gas volume in water-inundated gas storage facilities across multiple injection-production cycles. The simulation process of this invention is consistent with the changes in parameters such as pressure and time during the operation of the gas storage facility. Furthermore, by employing NMR to detect fluid changes within microscopic pore throats, the complex process of conventional working gas volume assessment is simplified, providing a basis for the rational operation of water-inundated gas storage facilities.
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