NP-1井页岩气压裂工艺优化设计研究

针对NP-1井具有储层温度高,压力高,闭合应力大,施工压力高的特点,分析地质因素和工程因素对产能的影响,采用交替注入酸、变排量、变黏度多级注入,优化泵注程序、施工排量,使用混合粒径支撑剂加砂,以保证裂缝导流能力.NP-1井压裂过程中,分段工具采用可溶性桥塞,压裂液采用变黏滑溜水体系.总加砂量2900 m3,平均每级加砂...

Study on optimization design of shale gas fracturing technology in well NP-1

In view of the characteristics of NP-1 well with high reservoir temperature,high pressure,large closure stress and high construction pressure,the influence of geological and engineering factors on productivity is analyzed.Alternate acid injection,variable displacement and variable viscosity multistage injection are adopted to optimize pump injection procedure and construction displacement,and mixed particle size proppant is used to add sand to ensure fracture conductivity.In the fracturing process of NP-1 well,soluble bridge plug is used as segmenting tool and variable viscosity slick water system is used as fracturing fluid.The total amount of sand added is 2900 m3,the average amount of sand per stage is 116 m3.The amount of fracturing fluid is 34257.5 m3,the average amount of fracturing fluid per stage is 1370.3 m3.The average sand ratio is 20.5%,the construction displacement is 11~18 m3/min,the cumulative gas production is 243×104m3,and the flowback rate is 44.8%.Good reservoir reconstruction effect has been achieved by fracturing.