Abstract
China is rich in coal-bed gas resources, however, because of the low abundance of coalbed methane, the low filtration ability of coal matrix and the complexity of gas streaming process, causing the single well productivity of conventional coalbed methane well is low. To improve the individual well producing rate and the economic effects of coal-bed gas reservoirs, the multilateral horizontal wells are being popularized on a large scale. Therefore, it is necessary to study the production decline law of multi-branch horizontal well in coalbed methane reservoirs. Based on the seepage physical model, a mathematical model based on resolution-diffusion-filtration was established. By using the point source function, the bottom pressure response function of single branch horizontal well was solved. By utilizing the theory of pressure superposition, mathematical model of production decline was gained, and the key elements influencing production decline were analyzed. The research results in this paper will have some guiding significance for efficient development of coalbed methane.
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