APPLICATION OF SHALE GAS RESERVOIR FRACTURING TECHNO-LOGY IN EAST CHONGQING

The industrial development of shale gas requires the volume fracturing of tight reservoir. Multilevel staged fracturing technique is one of the key techniques for the successful development of shale gas reservoirs. Shale reservoir, under the combined effect of in-situ stress and fracturing pressure, breaks through the shale matrix, and communicates with the weak structural plane of natural fracture, which forms a high conductivity network system. The release of free gas and adsorbed gas exists in shale reservoirs, improves initial shale gas production and ultimate recovery. According to the engineering geological characteristics of shale reservoir in east Chongqing, combined with YuyeA-2HF well and YuyeB-2HF well field fracturing construction data, this paper explores the suitable fracturing technology of shale reservoir in east Chongqing. The results show that the use of prehydrochloric acid treatment to keep the near well with diversion capacity, can protect the follow-up large displacement construction pressure window. Low sand ratio powder sand section of the multi-stage filter to achieve "controlled near and far", can increase the volume of the reservoir fracturing. Abnormal pressure layer glue front, made full hydraulic fracture, for the subsequent slickwater can carry proppant into the reservoir to create favorable conditions.