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低渗透油藏是基质渗透率较低的油藏,一般指的是低渗透的砂岩油藏。在我国,根据实际生产特征,按照油层平均渗透率的大小,把低渗透储层划分为三类:一般低渗透层、特低渗透储层、超低渗透储层。其中一般低渗透层属于常规油藏,特低渗透和超低渗透油藏属于非常规油藏。储石油企业在开发低渗透油藏过程中最常用到的技术就是压裂水平井。压裂水平井产能预测对压裂水平井的优化设计、开发效果的提升具有重要推动作用。对水平井压裂不仅能够获得较好的经济效益,而且还能够全面了解岩性、油藏特性,更深入准确的评价油藏。本文首先论述了低渗透油藏压裂水平井半解析的产能预测方法,其次对影响压裂水平井产能的因素进行了分析。
Low-permeability reservoirs are those that have a low matrix permeability and generally refer to low-permeability sandstone reservoirs. In China, according to the actual production characteristics, according to the average permeability of the reservoir size, the low permeability reservoir is divided into three categories: the general low permeability layer, ultra-low permeability reservoir, ultra-low permeability reservoir. Ordinary low-permeability layer which belongs to the conventional reservoir, ultra-low permeability and ultra-low permeability reservoirs are unconventional. The most common technique used by storage oil companies in developing low-permeability reservoirs is fracturing horizontal wells. Fractured horizontal well productivity prediction plays an important role in optimizing fracturing horizontal well design and improving development effect. The fracturing of horizontal wells can not only obtain better economic benefits, but also fully understand the lithology and reservoir characteristics and further evaluate the reservoir accurately. This paper first discusses the production prediction method of semi-analytical fracturing horizontal well in low-permeability reservoirs, and then analyzes the factors that affect the productivity of fractured horizontal wells.