Evaluating method for closure property of lithologic gas reservoir type gas storage
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An evaluation method and sealing technology, applied in earthwork drilling, measurement, wellbore/well components, etc., to achieve the effect of strong field operability, accurate sealing performance, and scientific evaluation method
Inactive Publication Date: 2018-05-01
PETROCHINA CO LTD
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Therefore, it is necessary to establish a more systematic, reliable and operable sealing capacity evaluation method for gas storage, but there is no systematic evaluation method for the sealing capacity of lithologic gas reservoir type gas storage in China
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Embodiment 1
[0027] Such as figure 1 As shown, a method for evaluating the sealing performance of a lithologic gas reservoir-type gas storage. The gas storage includes a cover plate, a bottom plate and a lateral boundary. The steps described are:
[0028] (1) For the evaluation of the sealability of the cover plate and the bottom plate, the macroscopic sealing performance of the cover plate and the bottom plate is firstly evaluated, and then the microscopic sealability evaluation of the cover plate and the bottom plate is carried out;
[0029](2) Evaluation of the closedness of the lateral boundary, firstly evaluate the microscopic sealing of the lateral boundary, then evaluate the spatial form of the lateral boundary, and finally conduct a dynamic evaluation of the lateral boundary;
[0030] (3) Inspect the overall sealing capability of the gas storage.
[0031] The method for evaluating the sealing performance of this lithologic gas reservoir type gas storage provided by the present inv...
Embodiment 2
[0033] Such as figure 1 , figure 2 and image 3 Shown, on the basis of embodiment 1,
[0034] Evaluation of the sealability of the cover plate and the bottom plate
[0035] In the described step (1), the evaluation of macroscopic sealing is:
[0036] 1) Clarify the stratum combination relationship: Firstly, the stratum division and comparison method is used to divide and compare the strata between wells. The stratum division and comparison method described is to first understand the regional geological situation and stratum development characteristics, and based on the stratum lithology characteristics, electrical characteristics, and physical properties Features, geochemical features, paleontological fossil markers, seismic reflection wave features, and logging curve features, adopt the principles and methods of multiple stratigraphic divisions, follow the principle and method of finding regional marker layers first, and then find auxiliary marker layers, first for large ...
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Abstract
The invention belongs to the technical field of evaluation for gas storages of gas fields, and particularly relates to an evaluating method for a closure property of a lithologic gas reservoir type gas storage. The evaluating method comprises the steps that evaluation of the closure property of a cover plate and a bottom plate is performed, specifically, the macroscopic closure property of the cover plate and the bottom plate is evaluated firstly, and then the microscopic closure property of the cover plate and the bottom plate is evaluated; the evaluation of the closure property of a lateralboundary is performed, specifically, the microscopic closure property of the lateral boundary is evaluated firstly, then a spatial form of the lateral boundary is evaluated, and finally dynamic evaluation of the lateral boundary is performed; and the overall sealing capability of the gas storage is inspected. According to the evaluating method for the closure property of the lithologic gas reservoir type gas storage, the problem that no systematic evaluating method for the sealing capability of the lithologic gas reservoir type gas storage is obtained in the prior art is solved; and the evaluating method is scientific, reliable, and highly operable on site, the sealing property of the gas storage is more accurately judged, the problem that the closure property of the lithologic gas reservoir type gas storage is difficult to demonstrate due to the trapped boundary is solved, the construction risk and the operational risk of the gas storage are reduced, and the safety of the gas storageis improved.
Description
technical field [0001] The invention belongs to the technical field of evaluation of gas field gas storages, and in particular relates to a method for evaluating the sealing performance of lithologic gas reservoir type gas storages. Background technique [0002] Gas storage can be used for natural gas seasonal peak shaving, emergency peak shaving and strategic reserves, etc. It has the advantages of large storage capacity, reasonable economy, and high safety factor. It can reduce the peak gas supply pressure in winter, optimize pipeline operation, and is not prone to fire or explosion , to ensure the continuous and safe gas supply of the gas field. Due to its irreplaceable role in peak shaving and gas supply security, the construction of underground gas storage has been highly valued by countries all over the world. In recent years, the demand for natural gas consumption in my country has been large and growing rapidly, and the dependence on foreign natural gas has graduall...
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