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在过去几年里,酸压已成为沙特阿拉伯国家石油公司“Khuff碳酸盐岩储层内直井生产能力最大化”气田开发战略的一部分。在酸压过程中,反应所形成的酸蚀孔洞导致滤失量过大。为了得到长缝、宽缝,获得最大产能,控制滤失量是酸压增产措施的关键。为了更深地渗透和就地形成稠化酸.使用柴油乳化酸的聚合物前置液交替注入技术广泛地用于大多数压裂施工,试图在施工过程中控制过多的滤失量。直井钻穿了不同孔隙度和渗透率的小层。这些小层经常被岩性夹层隔开,阻碍纵向连通。因此在很多酸压措施后,储层性质较好的层段过度反应,而其他层段没反应。因此,这些层段对气井的贡献并不理想。最近在几口气井中完成了一项试验,即在酸压过程中使用新的可降解纤维技术,取得了有效的酸转向效果,且不会对储层产生伤害。文章论述了成功实施该技术的计划和工艺设计过程,收集的井底压力数据和生产测井曲线证实了这项新技术的实用性。
Over the past few years, acid pressure has become part of the Saudi Arabian National Oil Company’s “Maximum Vertical Production Capacity in Khuff Carbonate Reservoir” gas field development strategy. In the acid pressure process, the acid etching hole formed by the reaction leads to excessive loss of filtration. In order to get long seam, wide seam, get maximum capacity, control of fluid loss is the key to acid pressure stimulation measures. In order to penetrate deeper and form in-situ thickened acids, the use of diesel emulsion acid polymer displacement fluid injection technology is widely used in most fracturing applications in an attempt to control excess fluid loss during construction. Straight wells drilled through small layers of different porosities and permeability. These small layers are often separated by lithological intercalations, hindering vertical connectivity. Therefore, after a lot of acid pressure measures, the reservoir layer with better properties overreacts while the other layers do not react. Therefore, the contribution of these intervals to gas wells is not satisfactory. In a few wells recently completed a trial that the use of new biodegradable fiber technology in the acid pressure obtained effective acid steering effect, and will not harm the reservoir. The article discusses the planning and process design process for successful implementation of the technology. The collected bottomhole pressure data and production logs confirm the practicality of this new technology.