Water Fracturing with Continuous Sand for Horizontal Wells in the Pengshui Block

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.