In recent years, China has a rapid development of shale reservoirs. QianJiang lacustrine shale oil reservoirs in Jianghan Basin are similar to Bakken shale where Multi-stage hydraulic fractured horizontal wells have been proven to be an effective method for reservoir development. In this study, we propose a novel three-step design method for Multi-stage hydraulic fracturing. Firstly, feasibility study on the formation of fracture network was applied to Q2 well by the analysis of brittleness index, the difference of horizontal stresses and the characteristic of natural fissure. Meanwhile the suitable fracturing fluid system was selected and optimized. Then, the fracture network is treated as a high permeable zone. The number, volume and permeability of high permeable zone represent the stimulated reservoir volume and these parameters were optimized by numerical simulation. At last, optimization of treatment parameters (scale and perforation mode) were conducted by the relationship between fracture network parameters (number, volume and permeability) and treatment parameters.

We applied the new design method in the first shale oil horizontal Q2 well in Jianghan Basin. Evaluation of postfracture data indicated that the new design method was proper and easy to use.

The paper describes a new and convenient design method of multi-stage hydraulic fracturing in shale reservoirs. The lessons learned from fracturing in shale oil formation were also discussed. Finally, further information about stimulation of shale oil formation in Jianghan Basin was provided.

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