水平井大规模水力压裂是实现页岩气效益开发的关键技术。随着工程工艺技术的进步,为页岩气井大规模压裂改造提供了较好的条件。近年来,华东油气分公司在平桥南区块开展大规模页岩气水平井压裂,但是水平井工程参数对产量影响相关性不明确,基于平桥南已压裂31口井工程参数与气井产量,对各项工程参数与气井产量通过现场数据线性回归的方式开展敏感性分析。研究结果表明,长水平段和优质页岩“甜点”段钻遇率是实现气井高产的基础;随着压裂簇数减小、用液强度减小和加砂强度增加,气井产量呈现增大的趋势,但是压裂施工参数达到一定程度后,气井产量增幅变缓。基于以上认识初步明确了平桥南区最优压裂规模参数,为下步的参数优化和开发方案调整提供依据,为平桥南邻区页岩气井实现有效压裂改造,实现效益开发打下基础。

Large scale hydraulic fracturing of horizontal wells is one of the key technologies to realize the effective development of shale gas. The progress of engineering technology provides better conditions for large-scale fracturing of shale gas wells. In recent years, large-scale shale gas horizontal well fracturing has been carried out in southern Pingqiao Block by Sinopec East China Oil and Gas Company, but the correlation between horizontal well engineering parameters and production is not clear. Based on the engineering parameters and gas well production of 31 fractured wells in southern Pingqiao, their sensitivity analysis are carried out by linear regression of the field data. The results show that the drilling encounter rate of long horizontal section and high-quality shale “sweet spot” is the basis for achieving high production of gas wells. With the decrease of fracturing cluster number and fluid strength and the increase of sand strength, the gas well production shows an increasing trend, but the increase of gas well production slows down when the fracturing operation parameters reach a certain extent. Based on the above understanding, the optimal fracturing scale parameters of southern Pingqiao Block are preliminarily defined, which provides the basis for the further parameter optimization and development plan adjustment, and lays the foundation for the effective fracturing and development of shale gas wells in the adjacent areas of southern Pingqiao Block.