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PRCI NS-38
- Interpretation of Aquifer Gas Storage Conditions from Water Pumping Tests
- Report / Survey by Pipeline Research Council International, 01/01/1968
- Publisher: PRCI
$50.00$99.00
L00450e
University of California
Need: The use of aquifers for storing gas underground has posed new problems for the natural gas industry. One does not have the advantages of converting an existing gas field into a storage project. In such cases, the original gas accumulation is sufficient proof that a reservoir exists in which gas can be stored. In the case of aquifers, however, the operator must first find an adequate geologic structure in which a suitable reservoir rock is located. This usually is solved by the application of existing exploration techniques, although the search for an aquifer storage site is normally carried out in much more detail than would ever be considered necessary in exploring for oil or gas. The most critical problem that the operator must face in aquifer storage is that of determining the tightness of the caprock layers overlying the intended storage zone. Having found a suitable site, the operator must attempt to answer the question: "Will gas leak through the caprock?". A number of aquifer storage projects have been hampered by migration of gas out of the intended storage zone, and in some cases, such migration has reached the surface or has invaded potable water sands. Such difficulties have pointed to the necessity of improving the methods used in evaluating aquifer storage before gas injection begins.
Result: The purpose or this project was to investigate how pumping tests could be used to evaluate certain heterogeneous situations in aquifer storage that had not previously been studied by the groundwater hydrologists. Part of the effort was therefore devoted to a review of the existing hydrology literature, and the bulk of the effort was directed to developing new solutions for problems peculiar to aquifer storage.
Benefit: This document is intended for use by gas storage engineers who are faced with the problem of how to evaluate the results of a pumping test. The mathematical development of the various equations that are cited is not included but rather the methods for employing these equations. Appropriate references are cited for those who desire the mathematical details.
University of California
Need: The use of aquifers for storing gas underground has posed new problems for the natural gas industry. One does not have the advantages of converting an existing gas field into a storage project. In such cases, the original gas accumulation is sufficient proof that a reservoir exists in which gas can be stored. In the case of aquifers, however, the operator must first find an adequate geologic structure in which a suitable reservoir rock is located. This usually is solved by the application of existing exploration techniques, although the search for an aquifer storage site is normally carried out in much more detail than would ever be considered necessary in exploring for oil or gas. The most critical problem that the operator must face in aquifer storage is that of determining the tightness of the caprock layers overlying the intended storage zone. Having found a suitable site, the operator must attempt to answer the question: "Will gas leak through the caprock?". A number of aquifer storage projects have been hampered by migration of gas out of the intended storage zone, and in some cases, such migration has reached the surface or has invaded potable water sands. Such difficulties have pointed to the necessity of improving the methods used in evaluating aquifer storage before gas injection begins.
Result: The purpose or this project was to investigate how pumping tests could be used to evaluate certain heterogeneous situations in aquifer storage that had not previously been studied by the groundwater hydrologists. Part of the effort was therefore devoted to a review of the existing hydrology literature, and the bulk of the effort was directed to developing new solutions for problems peculiar to aquifer storage.
Benefit: This document is intended for use by gas storage engineers who are faced with the problem of how to evaluate the results of a pumping test. The mathematical development of the various equations that are cited is not included but rather the methods for employing these equations. Appropriate references are cited for those who desire the mathematical details.
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