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METHOD FOR OPTIMIZATION OF HUFF-N-PUFF GAS INJECTION IN SHALE RESERVOIRS

United States Patent Application

20170159416
A1
View the Complete Application at the US Patent & Trademark Office
Methods for optimization of liquid oil production by huff-n-puff in shale reservoirs to achieve an improved (and optimal) oil recovery factor. The process determines and utilizes the optimum huff and puff times, number of cycles and soaking time under practical operation and reservoir conditions. The huff time in the process is a period so long that the pressure near the wellbore reaches the set maximum injection pressure during the huff period. The puff time in the process is the time required for the pressure near the wellbore to reach the set minimum production pressure during the puff period. Soaking is typically not necessary during the huff-n-puff gas injection in shale oil reservoirs. The number of huff-n-puff cycles is determinable by the time in which the economic rate cut-off is reached.
Sheng, James J. (Lubbock, TX)
Texas Tech University System (Lubbock TX)
15/ 372,214
December 7, 2016
GOVERNMENTAL INTEREST [0002] This invention was made with U.S. Government support under Grant No. DE-FE0024311 awarded by the Department of Energy. The Government may have certain rights in the invention.