Application of well-group numerical simulation in development of Qinshui CBM field

Most coalbed methane（CBM）fields feature in low permeability, small single-well’s pressure drawdown area, and bad developing effect. To drop coalbed pressure integrally, it is usually necessary to keep long-term drainage and mining under big well-group. In this article, mainly using numerical simulation method, a typical producing well-group’s production performance and development effect are appraised in Qinshui CBM field. Firstly the article briefly introduces some characteristics of CBM module in ECLIPS simulation software, and the well-group’s heterogeneous model is established with the help of comprehensive geology achievement and the test data. Using kinds of matching methods and skills, well group and single well’s gas（water）production histories and bottom-hole pressure are matched carefully, which can guarantee the modified model more closing to the actual reservoir situation. Based on the model, production performance is forecast、and contrastive analysis among development targets for different gas well are conducted. The research results provide an effective method to study well-group’s capicity and well interference, also give guidance to well-group’s field production.