Dynamic process and difference of coalbed methane wells production in southern Qinshui Basin
Abstract：Focused on the characteristic of coal seam in southern Qinshui Basin and analysis on the process and difference of production from one group well,the conclusions are shown that：in different group single-well,the gas production has a large change,production effect has obvious difference,water production capacity is also difference;in the process of CBM production,in order to avoid sand is brought out and compression-sensitivity,the production intensity and institutional adjustment are not be too large and frequent.Using different working system in different stages of CBM production,in the early stage is mainly drainage,the core of working system is controlled by the fluid level;in the medium-late stage is mainly gas production,the core of working system is controlled by the casing pressure（bottom hole flowing pressure）.In the process of CBM production,on the premise of keeping a certain back pressure and ensuring coal seam security,as possible as decreases casing pressure to product in order to decrease the average pressure of coal seam,enlarge the range of CBM adsorption and get high gas production.
Keywords：southern Qinshui Basincoalbed methane welldewatering gasdynamic processdifference
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 798-803 )