牙哈深层水敏性储层压裂改造难点及对策研究

摘要

At present,problem exists that it is difficult to use gasinjection to recover Yaha deep water-sensitive condensate gas reservoir,so it' s need to seek a effective period of stimulation while multiple acidizing does not work effectively.For this reason,the research from study on the geologic characteristics in Yaha area is started,formation characteristics,pay zone characteristics,and stress distribution; and proposed the hydraulic fracturing as the leading technology,analysis its difficulties,finds its countermeasures (high temperature and efficient anti-swelling,reduce the fracture pressure,rapid flow-back),simulates and optimizes the parameters of the water jet and hydraulic fracturing and the flow-back for the target of cumulative production,provides theoretical support to the effective injection.%目前牙哈深层水敏性凝析气藏存在注气开发难的局面,多次酸化增注效果又不明显,需要寻求一种效果好、周期长的增注改造技术.从牙哈区块的储层岩性特征、产层及地应力分布等方面入手,提出以水力压裂为主导的增产改造技术,分析存在难点,找到相应对策(高温高效防膨、降低破裂压力、快速返排),以累积产量为目标,模拟优化了水力喷射加砂压裂施工参数和压后快速返排参数,为提高增注效果提供理论支撑.