FRACTURING RESEARCH OF FRACTURED LOW PERMEABILITY RESERVOIR

Based on fracturing test conducted in Biantai buried hill fractured low perme-ability reservolr in Liaohe oil field, the authors considered the main problems needed to solve for hydraulic fracturing of fractured low permeability reservoir to be as follows:desand1ng is apt to take place at early stage of sand injection, and fracturing fluid will result in damage to the natural fracture. Therefore, while making design and carrying out construction, the dis-charge capacity, apparent viscoslty of fracturing fluid and preflush percentage were lncreased appropriately, certaln amount of pulverized haydite filtration inhibitor were added into the preflush to fill the opened natural fracture. so as to decrease the composite filtration coeffi-cient. Reservoir simulation(Simbest Ⅱ) was used for the first time to match the production history after fracturing of the fractured low permeabi1ity reservoir. reservoir features and post-fracturing effects were further understood-In this paper, the increase productivlty ef-fect also was evaluated. This case study provlded pl1ot test and technical experience for fur-ther developing the hydraulic fracturing technique of open type fractured low permeab1llty reservoir.