摘要
裂缝导流能力是影响煤层气井产能的重要因素之一,除实验研究裂缝导流能力外,还需应用数学方法建立裂缝导流能力计算模型,实现对裂缝导流能力快速有效的评价。以Carman-Kozeny公式为基础,建立了不同条件下的煤储层裂缝导流能力计算模型,分析了支撑剂尺寸、铺置层数、闭合压力与裂缝导流能力的关系。结果表明:支撑剂粒径越大,铺置层数越多,裂缝导流能力越大;闭合压力与裂缝导流能力呈现负相关关系;相同闭合压力时,支撑剂多层铺置的导流能力明显大于单层铺置时的导流能力。建议在压裂前期,使用较小粒径的支撑剂,使裂缝延伸更长;后期尾追较大粒径的支撑剂,提高近井地带的导流能力。
One of the important factors that affect coalbed gas well productivity is the fracture conductivity. To evaluate the fracture conductivity,besides the experimental studies,the calculation model of the fracture conductivity should be setup using mathematical method. Based on the Carman Kozenv formula,the calculation models of the facture conductivity were established in different conditions,which were used for analyzing the relationship between the flow conductivity and three factors:proppant size,paved layers and closure pressures. The study result shows that the flow conductivity increases with the increase of the proppant particle size and the paved layers,while the flow conductivity decreases when the closure pressure is reduced. Under the same closure pressure,multilayer proppants paved of flow conductivity are greater than single layer proppant paved of flow conductivity. In the early fracturing,using smaller proppants,the crack extension can be longer. In the late fracturing,the injected larger particle size proppants improve the conductivity near wellbore.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2014年第9期1852-1856,共5页
Journal of China Coal Society
基金
山西省煤层气联合研究基金资助项目(2013012002)
"十二五"国家科技重大专项资助项目(2011ZX05038-2-1)
关键词
煤层气
压裂
裂缝导流能力
理论模型
影响因素
coal-bed methane
fracturing
fracture conductivity
theoretical model
influencing factors
