Fluid Effect During Coalbed Methane Well Drainage of High Rank Coal Reservoir Under Pressure Control
SONG Ge
FU Xue-hai
GE Yan-yan
LI Sheng
Abstract：In order to obtain the dynamic equilibrium relationship among pressure,gas and water production in coalbed methane well drain-age of high rank coal reservoir,and reveal coalbed methane drainage effect as well as its mechanism under pressure control,taking X1 well and X2 well in southern Qinshui basin as examples,and based on drainage stages classification of X1 well,fluid effect and desorption laws in the two coalbed methane wells drainage were analyzed under changing pressure,relationships among gas production and casing pressure, dynamic liquid level height,pressure of downhose,depletion pressure were discussed and researched,and the variation characteristics of gas production before and after pressure control of X2 well were numerically simulated.The results showed that fluid effect in coalbed methane wells depend on control of casing pressure in the initial stage of drainage,a shutoff pressure and controlling pressure production system could contribute to coalbed methane well productivity effectively.
Keywords：coalbed methane well drainagefluid effectpressure controlhigh rank coal reservoir
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 60-64 )