水力压裂在边台潜山裂缝性低渗油藏的应用研究

依据辽河油田边台潜山裂缝性低渗油藏的压裂试验研究,认为:裂缝性低渗油藏水力压裂需解决的主要问题为加砂过程中容易出现早期脱砂和压裂液对天然裂缝的伤害。探讨了张开型天然裂缝油藏压裂研究方法及其施工优化程序,在设计与实施中,适当增加了施工排量、压裂液表观粘度与前置液百分数,并采用在前置液中加入一定浓度的粉陶防滤失剂来充填张开的天然裂缝,使其综合滤失系数下降。首次在水力压裂上使用油藏模拟(SimbestⅡ)进行了对裂缝性低渗油藏压后的生产历史拟合研究,进一步加强了对油藏特征与压后效果的认识。评估了已取得的增产效果。这实例研究对进一步发展张开型裂缝性低渗油藏的水力压裂技术提供了先导性试验与技术准备。

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.