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成熟油田的产量优化主要取决于储层特性的正确确定。生产持续一段时间后,由于注水、剩余油及压力体系改变而引起的地层水矿化度变化,也会使储层特性发生改变;同时,由于渗透率和油的粘度的快速变化等原始储层特性复杂性的存在,如果只应用常规测井方法,就会严重影响对预测产层的评价。这些变化对大多数常规测井响应都会有影响,因此,传统测井分析模型不能提供理想的评价结果,也不能获得正确的生产预测结果。之前已经有一些将高含水层错认为油层或者射孔层段没有产量的实例证明了这一点。磁共振成像(MRI)等一些新的测并技术可以给出成熟油田的地层评价结果。MRI技术有助于正确识别候选产层并提供关键的储层物性,包括油气类型、渗透率和孔隙度等储层物性以及阻挡层。用MRI确定油的粘度的能力如何,直接影响根据流体流度进行产层选择和删除的结果。因此,MRI能很好地完成对产油层的选择。本文讨论了MRI技术在确定委内瑞拉东部EI Furrial油田储层流体特性时的有效性。并突出介绍了该技术的两个优势:一是能够将漏判层的损失成本降至最低;二是能够识别最好的候选层段。本文还给出了通过生产测井和地层压力测量验证MRI的结果。
Yield optimization in mature fields depends mainly on the correct determination of reservoir properties. After production continues for a period of time, changes in formation salinity due to changes in formation water salinities due to flooding, remaining oil and pressure systems can also change reservoir characteristics; at the same time, primary reservoirs, such as permeability and oil viscosity, The existence of the characteristic complexity, if only the conventional logging method is applied, will seriously affect the evaluation of the predicted pay zone. These changes have an effect on most conventional well logging responses. Therefore, traditional log analysis models do not provide ideal evaluation results and can not obtain correct production forecast results. This is evidenced by some examples of mistaking aquifers for reservoirs or no production in perforation intervals. Some new measurement techniques, such as magnetic resonance imaging (MRI), can give stratigraphic evaluation of mature fields. MRI technology helps to correctly identify candidate pro forma layers and provide key reservoir properties, including reservoir properties such as oil and gas type, permeability and porosity, and barriers. The ability of MRI to determine the viscosity of the oil has a direct effect on the outcome of fluid formation selection and removal based on fluid flow. Therefore, MRI can well complete the choice of pay zones. This article discusses the effectiveness of the MRI technique in determining reservoir fluid properties in the EI Furrial field in eastern Venezuela. The two advantages of the technology are highlighted: one is to minimize the cost of losing the arbiter, and the other is to identify the best candidates. This article also presents the results of MRI verification through production logging and formation pressure measurements.