Research on optimization of target oil wells for CO 2 huff and puff in Yushulin oil well

Abstract

CO 2 huff and puff is one of the effective methods to develop the low permeability oil fields. But the optimization for target wells before conducting CO 2 huff and puff is the key step, since it is directly related to the success or failure of CO 2 huff and puff measures. The influence of various factors such as remaining oil saturation, water cut, reservoir thickness, permeability, porosity and flowing bottom hole pressure (FBHP)on the effect of CO 2 huff and puff is analyzed firstly in this paper so as to establish an evaluation index. And then analytic hierarchy process (AHP) is used to determine a reasonable weight of single factor. And finally, two oil wells, Shu 11Y68-57 and Shu 11Y67-611, are optimized for CO 2 huff and puff according to the fuzzy comprehensive evaluation method. The two wells optimized have a better effect of improving oil, which shows that the CO 2 huff and puff technology is feasible and has a certain generalized value. © 2013 Springer-Verlag GmbH.