TITLE:
Prediction of Coal Bed Methane Recovery Rate and Its Improvement Measures in Dafosi Mine Field
AUTHORS:
Dongmin Ma, Chenyang Zhang, Chuantao Wang, Xiaoyan Tang
KEYWORDS:
Recovery Rate, Isothermal Adsorption Curve Method, Hydraulic Model Method
JOURNAL NAME:
Journal of Power and Energy Engineering,
Vol.5 No.11,
November
24,
2017
ABSTRACT: The recovery rate of coalbed methane (CBM) can reflect the mining situation and the residual gas in coal reservoir. It plays an important role in the calculation of the recoverable resources. This paper mainly uses isothermal adsorption curve method and hydraulic model method to predict recovery rate of CBM. The isothermal adsorption curve method considering desorption lag problem in the prediction process, which is more in line with the actual situation. In the hydraulic model method, the recovery rate of “V” type well is the largest in the early stage. But with the time going on, the recovery rate of multilateral horizontal well is greater than vertical well, “U” type well and “V” type well finally. The factors affecting CBM recovery rate include geological characteristics, development conditions and economic factors. The geological characteristics of coal reservoir are the main factors affecting CBM recovery rate, and corresponding measures can be adopted to improve the recovery rate.