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首页> 外文会议>SPE Asia Pacific improved oil recovery conference (APIORC 01) >Prediction of IPR Curve of Oil Wells in Visco-Elastic Polymer Solution Flooding Reservoirs
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Prediction of IPR Curve of Oil Wells in Visco-Elastic Polymer Solution Flooding Reservoirs

机译：粘弹性聚合物溶液驱油藏油井IPR曲线预测

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When developing water-flooding reservoirs, oil and water arernregarded as Newtonian fluids in the study of inflowrnperformance relationship of oil wells. But for polymerfloodingrnreservoirs, prediction of inflow performancernrelationship of oil wells must consider non-Newtonianrnbehavior of the polymer solution. Based on present papers,rndescriptions about the flow behavior of non-Newtonian fluidrnin porous media are mainly concentrated on power-law fluids.rnThese studies do not consider the variation of rheologicalrnparameters along seepage flow direction and also elastic effectrnof polymer solution, therefore these models or results can notrnbe used to characterize the seepage behavior of polymerrnsolution in porous media and predict the inflow performancernrelationship of oil wells in polymer flooding reservoirs.rnAnalysis of the samples from oil wells in polymer floodingrnreservoirs shows that polymer solution produced still appearsrnvisco-elastic effect even at a lower concentration of thernpolymer solution. In this paper, according to a great quantityrnof experiment data on core displacement and rheologicalrnproperty, a model about the variation of rheologicalrnparameters along the seepage flow direction is developed. Arnconstitutive equation for visco-elastic fluid is constructed, inrnwhich the variation of the rheological parameters of polymerrnsolutions in porous media is taken into account. A formula ofrncritical elastic flow velocity is presented. Using thernconstitutive equation proposed in this paper, the seepage flowrnbehavior of visco-elastic fluid with variable rheologicalrnparameters is investigated. A model for calculating IPR of oilrnwell in polymer flooding is developed, in which variation ofrnin-situ fluid rheological parameter, visco-elastic effect,rnformation damage near the wellbore, decrease in formationrnpermeability and other factors are considered. This model isrnsolved using finite difference method and IPR curves andrnpressure distributions are predicted. Some factors affectingrninflow performance are analyzed. With this model, inflowrnperformance relationship of two oil wells in polymer-floodingrnreservoir in Daqing oil field is calculated. The predictionrnresult is coincident with the flow-after-flow data, the averagernrelative error is less than 10%.rnAccording to the predicted IPR results, the pumpingrnequipment and working parameters can be optimized. It is ofrngreat significance for designing a reasonable working systemrnfor oil wells in polymer-flooding reservoir.
机译：在开发注水油藏时，在研究油井入流性能关系时，将油和水视为牛顿流体。但是对于聚合物驱油来说，预测油井流入性能的关系必须考虑聚合物溶液的非牛顿行为。基于目前的论文，关于非牛顿流体在多孔介质中流动特性的描述主要集中在幂律流体上。这些研究既没有考虑流变参数沿渗流方向的变化，也没有考虑聚合物溶液的弹性效应，因此这些模型或研究结果不能用于表征聚合物在多孔介质中的渗流特性，也不能预测聚合物驱油藏中油井的渗流性能。对聚合物驱油井中样品的分析表明，即使在一定温度下，聚合物溶液仍会产生粘弹性效应。较低的聚合物溶液浓度。本文根据岩心位移和流变性质的大量实验数据，建立了流变参数沿渗流方向变化的模型。建立了粘弹性流体的本构方程，考虑了多孔介质中聚合物溶液流变参数的变化。给出了临界弹性流速公式。利用本文提出的本构方程，研究了流变参数可变的粘弹性流体的渗流特性。建立了聚合物驱油井IPR的计算模型，其中考虑了现场流体流变参数变化，粘弹性效应，井筒附近地层破坏，地层渗透率降低等因素。使用有限差分法对该模型进行求解，并预测IPR曲线和压力分布。分析了影响进水性能的一些因素。利用该模型，计算了大庆油田聚合物驱油藏两口油井的动态性能关系。预测结果与流后数据吻合，平均相对误差小于10％。根据预测的IPR结果，可以优化泵送设备和工作参数。为聚合物驱油藏中的油井设计合理的工作系统具有重要意义。

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