The Types of Reservoirs Encountered by the Wells in the Halahatang Oilfield and Water Flooding Effects
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摘要: 针对哈拉哈塘油田缝洞型油藏单井注水替油效果差异大的问题,在分析哈拉哈塘油田注水替油井动静态特征的基础上,建立了基于地球物理方法、录井响应特征、动态分析系统判别储集体类型的方法,将哈拉哈塘油田单井钻遇储集体划分为孤立洞穴+弱底水型、孤立洞穴+强底水型、裂缝孔洞型、裂缝孔洞+底部洞穴型等4种类型,并通过注水替油机理研究和矿场试验对不同类型缝洞体的注水替油效果进行了分析。该油田60口井注水替油的矿场实践结果表明,孤立洞穴+弱底水型、裂缝孔洞+底部洞穴型储集体宜采用注水替油方式开采,而裂缝孔洞型、孤立洞穴+强底水型储集体不适宜采用注水替油方式开采。研究结果对哈拉哈塘油田缝洞型油藏开发方式优选及改善单井注水开发效果有重要的指导作用。Abstract: In the fracture-vug reservoirs of Halahatang Oilfield, water flooding effects are quite different in different production wells. In order to solve this problem, a reservoir type discrimination method based on geophysical methods, logging response features, and dynamic analysis systems was established by analyzing dynamic and static characteristics of production wells in the process of water flooding. The reservoirs encountered by the wells in Halahatang Oilfield were divided into four types, i.e., isolated cavern+weak bottom water, isolated cavern+strong bottom water, fracture-vug and fracture-vug+bottom cavern. The water flooding effects in different types of fracture-vug reservoirs were analyzed by means of water flooding mechanism research and field test. This method was applied on site for water flooding operation at 60 wells in Halahatang Oilfield. And it was shown that the waterflooding method was suitable for isolated cavern+weak bottom water type and fracture-vug+bottom cavern type reservoirs instead of fracture-vug type and isolated cavern-strong bottom water type reservoirs. It was an important guidance for optimizing development modes of fracture-vug reservoirs and improving single-well water flooding effects in Halahatang Oilfield.
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Keywords:
- carbonate reservoir /
- reservoir /
- water flooding /
- fracture /
- vug /
- Halahatang Oilfield
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