长宁页岩气示范区H-x平台体积压裂技术

Stimulated reservoir volume technology used in H-x platform in Changning shale gas demonstration area

长宁页岩气示范区已开展大规模体积压裂并取得了良好的应用效果,但在现场实施过程中,存在高砂比阶段施工压力高、加砂困难的现象,通过在H-x平台开展压裂技术试验,为后期体积压裂方案优化提供依据。本次施工采用分簇射孔复合桥塞联作分段压裂工艺,H-x平台采用工厂化拉链式压裂,并进行了微地震裂缝监测。通过实时微地震数据分析,指导优化现场施工工艺参数。通过高黏液体的使用、提高粉砂用量、施工中期加酸以及胶液粉陶段塞等技术手段,形成了强非均质储层条件下体积压裂技术。提高了施工工艺针对性,降低了高砂比阶段的压力波动,提高了现场加砂规模。该研究可为后期长宁页岩气强非均质性储层压裂方案优化提供参考。

In Changning shale gas demonstration area,large-scale stimulated reservoir volume(SRV)has been carried out and the application results are good,but in the process of field construction,the phenomena of high construction pressure and difficult proppant adding occur in the stage with high proppant concentration.The fracturing technology was tested at H-x platform to provide the basis for the optimization of late SRV scheme.In this project,the staged fracturing process of combined clustering perforation and composite bridge plug was adopted,the factory-like zipper type fracturing was used at H-x platform,and microseismic fracture monitoring was carried out.The real-time microseismic data was analyzed to provide the guidance for the optimization of field technological parameters.The SRV technology suitable for strong-heterogeneity reservoir conditions was formed by utilizing the highviscosity liquid,increasing the silt dosage,adding acid in the middle stage of the construction and adopting the gel and ceramics powder plug.In this way,the pertinence of construction process is improved,the pressure fluctuation in the stage with high proppant concentration is reduced and the field proppant concentration is increased.The research results provide the reference for the optimization of the late fracturing scheme of Changning strong-heterogeneity shale gas reservoirs.