超高压裂缝型气藏分层压裂技术及应用

塔里木油田A气藏埋藏深、压力高、应力大、天然裂缝发育、储层厚度大,是典型的超高压裂缝型气藏。储层笼统压裂效果差,采用分层压裂改造技术,取得较好的效果。针对超高压深井裂缝型气藏分层压裂难度大的特点,优选完井封隔器+压裂封隔器+滑套作为分层压裂工具;采用测井地应力解释和优化射孔模拟方法,进行分层优化;密度为1.32g/cm3的加重压裂液体系能降低井口施工压力;使用高压施工设备,能满足地面高施工压力的要求。针对超高压深井裂缝型气藏分层改造技术的研究和认识,对类似气藏改造有借鉴和推广作用。

Multistage Fracturing Technology and Application for Ultra-high Pressure Fractured Gas Reservoir

A gas pool in the Tarim oilfield is a typical of ultra-high pressure fractured gas reservoir,with deep burial,high pressure,high stress,natural fractural development,and thick bed.The general fracturing is not well fitted,while the multistage fracturing plays a good role.To resolve the difficulties of the multistage fracturing for the ultra-high pressure fractured gas reservoir,we optimize the multistage fracturing tools with well completion packer,fracturing packer and sliding sleeve.We use the logging stress integration and optimizing perforation simulation technology to optimize the layering.We deploy the weighted fracturing fluid with density of 1.32 g/cm3 to decrease the tubing pressure.The high pressure equipments are used to fit the requirement of high tubing pressure.The result and experiences of the multistage stimulation of HTHP fractured deep gas reservoir is helpful to other gas reservoirs.