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Experiment on short-term conductivity of sand-adding acid-fracturing propping fractures in carbonate reservoir
JIANG Hu1,CHEN Mian1,ZHANG Guang-qing1,JIN Yan1,ZHANG Fu-xiang2,LIU Han-ming3
(1. State Key Laboratory of Petroleum Resource and Prospecting in China University of Petroleum, Beijing 102249, China;2. Department of Exploration, Tarim Oilfield Branch Company,Kuerle 841000, China;3. Chuanxi Drilling and Exploration Company, Sichuan Petroleum Administrative Bureau,Chengdu 610051,China)
Abstract:
An experiment on short-term conductivity of sand-adding and acid ecthing sand-adding propping fractures was carried out with carbonate cores by selecting different ceramsite proppant. The experimental results show that the core surface is roughness, loose and soft after acidizing, which results in many fine mineral particles producing and conductivity of acid ecthing sand-adding propping fractures decreasing. For sand-adding acid-fracturing wells,the effective closure pressure must be carefully controlled lower than strength of proppant and acid ecthing formation to prevent proppant embed and destroy,formation deformation,to minimize conductivity damage. The bigger proppant size should be selected if the working conditions allow.
Key words:  carbonate reservoir  sand-adding acid fracturing  acid ecthing-propping composite fracture  conductivity  effective closure pressure