Abstract
To address the difficulty of increasing production in tight and naturally fractured reservoirs in the Tarim Basin oilfield, a study was conducted to maximize the volume of reservoir transformation through close-spaced fracturing. The parameters of close-spaced fracturing were optimized, reducing the average cluster spacing to 7m and the average stage spacing to 52m, significantly improving the degree of fracture control in the reservoir. This study developed key technologies for large-scale volume fracturing in horizontal wells, including high-rate horizontal wells with a flow rate of 16-20m3/min, freezing gel for creating main fractures, slickwater for creating complex fracture networks, small particle-size proppants in quartz sand, and high-strength proppants, which effectively supported main fractures and various level discontinuity fractures. Field trials have demonstrated that this technology significantly improves the effectiveness of fracturing in horizontal wells, with a cumulative oil production of 10,969.3m3 in 18 months, more than triple the production of previous horizontal wells. The results of this study indicate that large-scale close-spaced volume fracturing in horizontal wells can effectively address the challenge of low reservoir productivity in the Tarim Basin, providing strong technical support for the efficient development of deep oil and gas resources in the region.
