Method and system for evaluating the seal integrity of an aquifer reservoir caprock using a cap assembly

By forming a combination of reservoir and caprock samples and using foamed cement and testing equipment to simulate formation conditions, the problem of evaluating the sealing performance of the caprock in aquifer gas storage has been solved, enabling accurate evaluation of the caprock's sealing performance and safe operation of the gas storage facility.

CN116754155BActive Publication Date: 2026-04-21INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202310492352.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-04
Publication Date
2026-04-21
Estimated Expiration
2043-05-04

AI Technical Summary

Technical Problem

The lack of effective evaluation methods for the sealing performance of caprocks in large-scale aquifer gas storage facilities affects the safe construction of gas storage facilities and the optimized design of injection and production processes.

Method used

By forming a reservoir-capsule rock sample assembly, foamed cement is used to bond the capsule and reservoir rock samples. Combined with heat shrink tubing, gas leak detection device, triaxial loading chamber and displacement sensor, gas circulation injection and production are simulated under actual formation conditions, and the capsule sealing performance is detected in real time.

Benefits of technology

It can accurately evaluate the sealing performance changes of different types of cap layers, provide operating pressure references, and ensure the safety and injection-production efficiency of gas storage facilities.

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Abstract

This invention discloses a method and system for evaluating the sealing performance of caprocks in aquifer reservoirs using a caprock-reservoir assembly. Foamed cement is used to adjust the mix proportions to obtain a transition layer similar in density and porosity to the caprock, serving as a bond between the caprock and reservoir. This system can be applied to caprocks of any lithology, fully considering the initial structural characteristics of the caprock, i.e., using pre-fabricated fractures to fully simulate the complex fractures or faults present in the original caprock. Gas leakage detection of the caprock body is conducted by simulating the cyclic injection and production of gas into the reservoir under simulated formation conditions. Real-time analysis of gas leakage along the caprock body allows for effective evaluation of caprock sealing failures and leakage caused by different types of caprocks and caprocks with different fracture characteristics during the injection and production process of the underlying reservoir. This provides a reference for establishing the upper limit operating pressure of aquifer gas storage facilities with different types of caprocks.
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