Improved CO sub 2 Enhanced Oil Recovery Mobility Control by in-Situ Chemical Precipitation: Annual Report for the Period September 1985 to September 1986

摘要

The objective of this study is to develop a process that will increase ultimate oil recovery and will improve the operational economics of CO sub 2 flooding over current state-of-the-art practices. The specific goals of the research work are: to determine and evaluate the optimum conditions and materials for chemical precipitation over a realistic range of reservoir pressures and temperatures; to evaluate the permeability alteration by in-situ chemical precipitation in core samples; to extend the laboratory results to predict the outcome of the field application by modeling and computer simulation; and to determine the expected increase oil recovery through application of the in-situ precipitation to a specific target reservoir. During year one, the following tasks and subtask were completed: Task I - technology review; Task II - experimental design, construction and calibration; and subtask I - precipitation formation of Task III. Accomplishments for these tasks are discussed. The comparison of the ambient and PVT cell test results of precipitation formation indicate that both CaCl sub 2 and BaCl sub 2 have potential for use in core tests. However, at this time the BaCl sub 2 appears to be the better choice. 4 tabs. (ERA citation 12:015355)