HPG frac fluid system with hydraulic nitrogen energizing is optimized and a series of separate layer fracturing without pulling string technology is formed and widely used in Daniudi gas field.

• 针对大牛地气田储层低压、低孔、致密、纵向上目的层多,层间跨距变化大,且单层产能低的特征,开展不动管柱分层压裂改造技术研究,以实现该气田多层叠置气层的均衡改造。