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基于等效井径模型,综合考虑各裂缝不同参数、裂缝变质量入流和井筒变质量流动等因素的影响,建立并求解了基岩和压裂缝同时向井筒供气的井筒与气藏耦合的压裂水平井产能预测模型.研究分析了压裂水平井产能敏感因素.结果表明:压裂水平井的产能随裂缝条数、裂缝半长、裂缝间距的增加而增加;为获得较高的产能,压裂时应尽可能保持裂缝与井筒垂直;压裂缝条数一定时,裂缝越长、间距越大,压裂缝产能贡献越大,而裂缝越短、间距越小时,基岩向井筒供气的贡献越大,压裂缝贡献相对较小.研究成果为气藏压裂水平井设计提供了科学依据.
Based on the equivalent borehole model, considering the influence of different parameters of each fracture, infiltration of variable fracture flow and variable mass flow of wellbore, the pressure of wellbore and gas reservoir coupled with bedrock and fracturing seam to gas well is established and solved Fractured Horizontal Well Productivity Prediction Model.The productivity-sensitive factors of fractured horizontal wells are analyzed.The results show that the productivity of fractured horizontal wells increases with the number of fractures, half-length of fractures and the increase of fracture spacing. In order to obtain higher productivity, Fracturing should be as far as possible to keep the fracture vertical with the wellbore; fracturing the number of a certain number of fractures, the longer, the greater the spacing, the greater the contribution of fracture productivity, and the shorter cracks, the spacing is smaller, the bedrock gas supply to the wellbore The larger the contribution, the smaller the contribution of fracturing. The research results provide a scientific basis for the design of fractured horizontal wells in gas reservoirs.