致密碎屑岩气藏低伤害压裂液的研究与应用

Research and Application on the Low Damage Fracturing Fluid in the Tight Sandstone Gas Reservoir

关键词:  低伤害  致密碎屑岩  纤维  超低浓度  线性自生泡沫

Key words:  low damage  tight sandstone  fiber  ultralow concentration  linear self-generating foam

摘要:

随着川西蓬莱镇组气藏开发的深入,地层能量不断下降,压裂过程中返排率低,压裂液滤液侵入地层,伤害严重,制约了浅层蓬莱镇组气藏的高效开发。为了降低压裂液对储层的伤害,提升气藏的开发效益,在对压裂液性能需求进行研究的基础上,提出了降低压裂液对储层伤害的技术对策,形成了适合于川西浅层蓬莱镇组气藏的超低浓度稠化剂压裂液体系和线性自生泡沫压裂液两套低伤害压裂液体系,并在川西蓬莱镇组进行了推广应用。返排率分别达到了65.1%和61.9%;压后平均产能分别为0.81×104m3/d和1.45×104m3/d,取得了明显的增产效果。

Abstract:

With deep development of the gas reser- voirs of Penglaizhen layer in western Sichuan, formation energy is continually falling. Some problems have cropped up during fracturing process, including flowback rate dropping and fracturing fluid filtrate invading seriously, which restrict efficient exploitation of shallow layer Penglaizhen gas reser- voirs. Based on the research of performance requirements of the fracturing fluids, technical countermeasures was proposed to reduce fracturing fluid damage to reservoir, and improve the development benefits of gas reservoirs. Finally, the two low damage fracturing fluid systems: ultra-low concentration thickener fracturing fluid system and linear fracturing fluid system are formed, which are suitable for Sichuan Penglaizhen gas reservoir and widely applied in western Sichuan Penglaizhen. Flowback rate are 65.1% and 61.9%respectively, average production are 0.81×104m3/d and 1.45×104m3/d respectively after fracturing. The significant effect for increasing yield is achieved.