Study on diagnose of CBM Well performance in Shizhuang Block, Qinshui Basin
KANG Yong-shang
JIANG Shan-yu
LI Sheng-jie
WANG Jin
YE Jian-ping
ZHANG Shou-ren
ZHANG Bing
QIN Shao-feng
WU Jian
Abstract：The characteristics of a CBM well performance is complex due to multiple influencing factors.It is beneficial for well site/layer selection and fracturing design to diagnose the performance of single CBM well.Based on the geological conditions and well performance data of 30 CBM wells producing from No.3 coal seam of Permian Shanxi formation in Shizhuang block,this paper studies the characteristics of CBM Wells performances and the relationship between gas production and water production.A negative enveloping relationship between gas production and water production is revealed,with high water production generally inhibiting high gas production.From a point of view of closeness of system borehole-stimulated coal interval,the mechanism of high water production due to outside water supply from sandstone aquifers is discussed and a hierarchical performance diagnostic method for single CBM well is proposed.The performance of some typical well are diagnosed using this hierarchical method,showing the method provides a tool for understanding the performance of single CBM well in Shizhuang CBM block and the application of this method can be extended to other CBM blocks.
Keywords：coalbed methaneShizhuang blockCBM well performancefaulthydraulic fracture typeslithological assemblage
Publication Date：2017-01-01
Pages：10( 1496-1505 )