With the continuous production of oil wells, the reservoir properties, such as permeability and porosity, are changing accordingly, and the reservoir heterogeneity is also enhanced. This development is vulnerable to the problem of the one-way advance of injected water and low efficiency of water flooding. The interwell connectivity between injection and production wells controls the flow capacity of the subsurface fluid. Therefore, the analysis of interwell connectivity helps to identify the flow direction of injected water, which is of great significance for guiding the profile control and water plugging in the later stage of the oilfield. In this study, based on the principle of mass conservation, a capacitance model considering the bottom-hole flowing pressure was established and solved by using the production dynamic data of injection–production wells. Then, the validity of the capacitance model was verified by numerical simulation, and the influences of well spacing, compression coefficient, frequent switching wells, injection speed, and bottom-hole flowing pressure on interwell connectivity were eliminated. Finally, a practical mine technique for inversion of connectivity between wells using dynamic data was developed. The advantage of this model is that the production dynamic data used in the modeling process are easy to obtain. It overcomes the shortcomings of previous models and has a wider range of applications. It can provide a theoretical basis for the formulation of profile control and water-plugging schemes in the high-water-cut period.

中文翻译：

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考虑井底流动压力和油井间干扰的改进电容模型

随着油井的不断生产，渗透率、孔隙度等储层物性也随之发生变化，储层非均质性也随之增强。这种发展容易受到注入水单向推进和注水效率低的问题。注入井和生产井之间的井间连通性控制着地下流体的流动能力。因此，井间连通性分析有助于识别注入水的流动方向，对指导油田后期调剖堵水具有重要意义。本研究根据质量守恒原理，利用注采井生产动态数据建立并求解考虑井底流动压力的电容模型。然后，通过数值模拟验证了电容模型的有效性，消除了井距、压缩系数、频繁换井、注入速度、井底流动压力对井间连通性的影响。最后，开发了一种使用动态数据反演井间连通性的实用采矿技术。该模型的优点是建模过程中使用的生产动态数据容易获取。克服了以往机型的不足，应用范围更广。