摘要
低渗透气藏渗透率低,渗流阻力大,往往须通过压裂改造才能获得工业气流,而合理的裂缝参数是水力压裂取得良好效果的关键。从气体在低渗透气藏中的渗流机理研究入手,考虑了气体非达西渗流对产量的影响,建立了气井压裂产量预测模型,在裂缝导流能力的计算中考虑了裂缝的失效性。对现场实例进行了模拟计算,以压裂改造后的采出程度为目标进行了裂缝参数优化设计,并分析了渗透率各向异性对产气量的影响。研究结果表明,渗透率各向异性越强,产气量增加幅度越小;优化的裂缝导流能力为30～40μm2.cm,缝长比为0.25～0.3。
Low permeability gas reservoirs have high flow resistance and hydraulic fracturing is usually required in order to gain commercial gas flow.Appropriate fracture parameters are favor of hydraulic fracturing.A production model for predicting operation of gas well was established depending on the gas percolation mechanism and the influence of gas non-Darcy flow on production.Meanwhile the invalidation of fractures in the conductivity calculation was taken into consideration.By means of the simulation calculation of field application,fracture parameters were optimized with the recovery degree after fracturing as the goal,and effect of permeability anisotropy on the gas production was analyzed.It indicates that the more obvious permeability anisotropy,the smaller increase of gas production.The optimized fracture conductivity and ratio of fracture length to well spacing are 30 to 40μm2 · cm and 0.25 to 0.3,respectively.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2008年第5期105-107,共3页
Petroleum Geology and Recovery Efficiency
基金
国家高科技研究发展计划"863"项目"深层低渗透油气藏压裂改造关键技术"(2006AA06Z226)
关键词
气井
压裂
各向异性
裂缝参数优化
缝长比
导流能力
gas well
fracturing
anisotropy
fracture parameter optimization
the ration of fracture length to well spacing
fracture conductivity
