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Author
Title An Analytical Approach for the Estimation of Saturation and Pressure Behavior in Water-drive Gas Reservoirs
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Publication Date
Degree MS
Discipline/Department Petroleum and Natural Gas Engineering
Degree Level masters
University/Publisher Penn State University
Abstract This thesis presents a new analytical approach for predicting pressure behavior following production from a water-drive natural gas reservoir. It is difficult to predict the rate of water influx into a gas reservoir because information about the aquifer is often unknown and saturations at points far from the wellbore cannot be directly measured. The analytical model proposed by this research utilizes an idealized composite reservoir model to approximate conditions after water influx into the reservoir. The model has the potential to eliminate the need for numerical simulation to analyze these types of reservoirs, which would be beneficial to small companies that may not have access to expensive numerical simulators. Given the saturation profiles, the model’s forward solution is able to predict pressure build-up behavior for any time during the well’s shut-in period. The results contained in this report show that the analytical composite model can accurately predict pressure build-up behavior in systems with low permeability, and can predict pressure build-up in high permeability systems with slightly less accuracy. Future work involves reversing the analytical solution to predict saturation profiles using only pressure build-up data.
Subjects/Keywords Petroleum Engineering Water-Drive Gas Reservoirs Analytical Comp
Rights Unrestricted
Country of Publication us
Record ID oai:etda.libraries.psu.edu/oai/15311
Repository psu
Date Retrieved
Date Indexed 2017-01-24
Grantor Penn State University

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