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在气田开发过程中,水平井具有泄油面积大、单井产量高、储量动用程度高等优点。对于低渗气藏,由于地层发育不好,地层连通性和渗透性不能满足生产的需要,气体流动阻力大,水平井单井产量满足不了经济开发的需求。针对该情况,油田采用水力压裂技术使地层形成多条人工裂缝,增加气体的渗流通道,从而来提高水平井的单井产量。本文首先分析水平井压裂后人工裂缝的形态。并在前面分析的基础上建立压裂水平气井的渗流数学模型,得到压裂水平气井的渗流解析式,分析影响压裂水平气井渗流过程的因素。
In the process of gas field development, horizontal wells have the advantages of large drainage area, high single well output and high reserves utilization. For low-permeability gas reservoirs, the gas flow resistance is large and single-well horizontal well production can not meet the needs of economic development due to poor formation development, formation connectivity and permeability that can not meet production needs. In response to this situation, the field uses hydraulic fracturing technology to make the formation of multiple artificial fractures, increase gas seepage channels, thereby increasing the horizontal well single-well production. This paper first analyzes the shape of artificial fractures after horizontal well fracturing. Based on the previous analysis, the seepage mathematical model of fractured horizontal gas wells is established, and the seepage analytical formula of fractured horizontal gas wells is obtained, and the factors influencing the seepage process in fractured horizontal gas wells are analyzed.