塔里木油田克深区块致密砂岩气藏的储层改造技术

Reservoir reconstruction technology for tight sandstone gas pool in Keshen Block of Tarim Oilfield

塔里木油田克深区块超深井温度高、压力高、射孔段长,利用常规压裂手段很难达到储层改造的目的。本研究通过对目标井的地质分析和储层评价,针对该井压裂改造的难点,提出了相应的改造思路并进行现场施工。研究采用以冻胶压裂为主,滑溜水体积压裂为辅的混合压裂方式;采用分簇射孔和纤维暂堵转向工艺进行分级施工,并根据监测裂缝发育情况实时调整压裂施工方案。现场施工成功实现了超深高温高压井的分层压裂改造,将目标井产量从1.5×104 m3/d增加到21×104 m3/d,对该区块同类型井的储层改造具有很好的指导意义。

The ultra-deep wells in Keshen Block of Tarim Oilifeld have high temperature, high pressure and long perforated sec-tions, so it is very hard for normal fracturing to achieve reservoir reconstruction. Through geologic analysis and reservoir evaluation for target well and in line with the dififculties in fracturing of the target well, a modiifcation idea was presented and implemented on site. It was decided that mixed fracturing method was used with gel lfuid fracturing as the main approach and slickwater volumetric fractur-ing as the auxiliary. Staged fracturing was carried out by cluster perforation and ifber plugging diversion technology, and the fracturing plan was duly adjusted by monitoring the fracture development. Field job successfully realized zonal fracturing in ultra-deep and HTHP wells, and increased the target production from 1.5×104 m3/d to 21×104 m3/d, providing a favorable guiding signiifcance for reservoir reconstruction in similar wells in this block.