Numerical Simulation Research on Well Pattern Optimization in High–Dip Angle Coal Seams: A Case of Baiyanghe Block

The Baiyanghe block in Fukang, Xinjiang, China, is rich coalbed methane (CBM) resources, and several pilot experimental wells have yielded high production. Due to the dip angle (35–55°) of coal seam this area, lack understanding geological characteristics, physical properties coal, gas–water migration law lead immature development techniques poor overall benefits. We first conducted desorption adsorption tests on low-rank area found residual gas coal. established a model suitable for by modifying isotherm model. Next, analyzing influence gravity differentiation high–dip shallow fired characteristics we discovered leakage CBM from exposed seam. Given particular property optimized well pattern: (i) U-shaped along-dip horizontal group seams main production with spacing distance 312 m; (ii) multistage fracturing drilled floor water production; (iii) vertical 156 m capture leakage. Using numerical simulation net present value (NPV) economics models, pattern details. Applying our model, simulator can improve accuracy productivity forecast. optimization results demonstrated following: 1) cumulative single increased 89% optimal spacing, 2) 87.54% after adding staged well, 3) amount decrease 67.59%.