Water Fracturing with Continuous Sand for Horizontal Wells in the Pengshui Block
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摘要: 为了提高常温低压页岩气藏的开采效益,开展了彭水区块水平井清水连续加砂压裂技术应用研究。根据前期邻井同层的压裂数据,进行了彭页4HF井的压力预测和拟合,论证了清水加砂压裂的可行性。计算表明,彭水地区清水加砂时地面施工压力随射孔段深度增加而升高,射孔段深度不超过4 340 m时,施工压力不会超过限压91.0 MPa。彭页4HF井压裂施工过程中,根据压力变化情况实时调整优化压裂方案,逐步降低降阻剂浓度,直至完全停用降阻剂。彭页4HF井后4段全程清水连续加砂压裂,射孔段最深为2 434.0 m,施工压力最高69.2 MPa,压裂加砂符合率105.9%,单井压裂液费用降低约400万元。研究结果表明,清水连续加砂压裂地面施工压力与射孔段深度呈正相关关系,清水连续加砂压裂技术可大幅降低压裂成本。Abstract: In order to improve recovery efficiency of normal temperature and low pressure shale gas reservoirs, the applicability of water fracturing technology with continuous sand for horizontal wells in the Pengshui Block was investigated.Base on preliminary fracture data from the same layers in offset wells, pressure prediction and fitting were made for Well Pengye 4HF in order to demonstrate the feasibility of water fracturing with sand.Calculation results showed that the operation pressure increased with the perforation depth in water fracturing in the Pengshui Block and it would not exceed the limit of 91 MPa as long as the perforation depth was no more than 4 340 m.According to the change of operation pressure, fracturing scheme of Well Pengye 4HF was adjusted and optimized in real-time, and tests were conducted to gradually reduce the concentration of resistance reducing agent until it was completely abandoned.In the last four sections of the well, water fracturing with continuous sand was performed, in which the maximum perforating depth was 2 434.0 m, the highest operation pressure was 69.2 MPa.cost fracturing fluid was reduced by about 4 million yuan.The results showed that operation pressure has a positive correlation with the perforation depth when conducting water fracturing with continuous sand.The application of the technology could greatly reduce the cost of fracturing fluid.
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