Refracturing technology is widely used in the development of old oilfield, especially for typical formations such as tight sandstone and shale. The efficiency of refracturing methods in sandstone mixed conglomerate formations remains to be studied. In terms of fracturing method of fracturing sandstone mixed conglomerate formation, based on the mechanism of dynamic load to promote fracture branching and fracturing fluid penetrating to reduce the effective stress, this paper proposed "variable injection rate, staged different fracturing fluids" refracturing method. To verify the rationality of the method, the sandstone mixed conglomerate formation was taken as experimental specimen, and the indoor true triaxial fracturing simulation experiments were conducted by using variable injection rate and different fracturing fluids. The mechanisms of refracturing at each stage were summarized. The research showed that the number of fractures produced by the variable injection rate fracturing method was at least 3 times more than that of the constant injection method. The number of hydraulic fractures generated by the multi-fracturing fluid combined fracturing method was 3 times more than that of the constant injection method. The fracturing method with variable injection rate and staged multi-fracturing fluid can provide a certain reference for refracturing the sandstone mixed conglomerate formation to produce complex fractures.
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罗垚,聂元训,王波,等. 含砾砂岩储层重复压裂新方法及机理分析[J]. 科学技术与工程, 2020, 20(27): 11074-11079. LUO Yao, NIE Yuan-xun, WANG Bo, et al. New Method to Refracture Conglomerate formation and Mechanism Analysis[J]. Science Technology and Engineering,2020,20(27):11074-11079.