Abstract:

Due to the well-developed end cleat and surface cleat, the complicated fracture morphology forms easily in the coal-bed fracturing, and the conventional double-wing fracture model is not suitable for the optimization of the coal-bed methane fracturing design. In order to improve the production of the coal-bed methane, we proposed a characterization method for the equivalent seepage of the complex fracture, in which the complex network fracture was equivalent to the high permeability zone. By optimizing the size and permeability of the high permeability zone, we got the best overall fracturing fracture length and fracture conductivity. Meanwhile, we also optimized the pumping parameters by using 3D fracturing simulation software, and carried out the fracturing operation and down-hole micro-seismic monitor tests of 3 wells. The results showed that the fracture length covers a wide field and the complexity after fracturing is high, and the average post-fracturing daily production is 1 376.7 m ³/d. It provides a technical support to the integral fracturing development of coal-bed methane.

Key words: coal-bed methane, integral fracturing, network fracturing, SRV fracturing, parameter optimization