Coalbed methane reservoir dynamic simulation comparisons using the actual steeply inclined model and ideal steeply inclined model

Numerical simulation is an efficient method to quantitatively describe the reservoir dynamics of coalbed methane (CBM) reservoirs. The ideal steeply inclined model (ISIM), assumed be a plate, has been widely applied in steep modeling, although ISIM cannot accurately reflect actual geological conditions. In this paper, CBM production and reservoirs using (ASIM) were compared, taking coal Fukang mining area located northwestern China as example, with purpose revealing differences applicability ASIM ISIM. established by Petrel software, was matched predicted Eclipse software. Data reflecting dynamics, such water saturation, pressure, gas content, extracted. dynamic changes physical properties also compared. results showed that: 1) multiple peaks occurred both maximum daily earlier than peak cumulative greater 2) Due variations grid shape dip angle each ASIM, effect better third stage (4–10 years) drainage. 3) drainage, decrease rate pressure larger because relatively performance ASIM. 4) Differentiation dominated variation trend higher recovery efficiency compared Compared proposed previous scholars, more helpful monitor behavior reservoirs, can provide reliable basis for guiding development.