致密油藏水平井分段多簇压裂产能预测方法

发布时间：2018-01-13 00:07

本文关键词：致密油藏水平井分段多簇压裂产能预测方法　出处：《特种油气藏》2017年04期 　论文类型：期刊论文

【摘要】：由于致密油藏在水平井分段压裂后形成复杂多簇缝网,为了正确表征缝网,更准确地预测产能,根据等效渗流理论,基于Warren-Root模型,将压裂后形成的分段多簇缝网等效为高渗透带,并推导出等效渗透率及高渗透带宽度的关系式。在此基础上,应用复位势理论和势的叠加原理,运用解析法建立了致密油藏分段多簇压裂水平井考虑裂缝间干扰的非稳态产能预测模型。研究表明:致密油藏水平井日产量呈"L"型递减,产量初期递减快,后期趋于平稳;实例计算结果与实际产量接近,相对误差较小;高渗透带渗透率越大,长度越长,压裂水平井产能越大,但基于经济技术等条件,各自存在最优值。该产能预测方法对致密油藏开发具有指导意义。
[Abstract]:Due to the formation of complex multi-cluster fracture networks in a tight reservoir after horizontal well fracturing, in order to correctly characterize the fracture network and predict productivity more accurately, according to the equivalent percolation theory, based on Warren-Root model. The piecewise multi-cluster fracture network formed after fracturing is equivalent to the high permeability zone, and the relationship between the equivalent permeability and the width of the high permeability zone is derived. On this basis, the reset potential theory and the superposition principle of the potential are applied. An unsteady productivity prediction model for horizontal wells with segmental and multi-cluster fracturing in dense reservoirs is established by using analytical method. The results show that the daily production of horizontal wells in dense reservoirs decreases in the form of "L" and the initial production decreases rapidly. The late stage tends to be stable; The calculated result is close to the actual output, and the relative error is small. The greater the permeability and the longer the length of the high permeability zone, the greater the productivity of the fractured horizontal well, but based on the economic and technological conditions, there are optimal values for each of them. The method of productivity prediction is of guiding significance for the development of dense reservoirs.
【作者单位】：油气藏地质及开发工程国家重点实验室;西南石油大学;
【基金】：国家科技重大专项“碎屑岩储层水平井压裂优化设计软件开发”(2016ZX05002-005-011)
【分类号】：TE328
【正文快照】： 0引言近年来,常规油气资源已进入难动用时期,开发非常规油气资源已经成为各国的能源发展目标。中国致密油远景资源量约为50×108t,具有巨大的开采潜力[1]。然而,致密油藏储层物性差,几乎无自然产能,目前常用开采模式为长水平段水平井+体积压裂。国内外油田实践证明,水平井分段

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