Polymer flooding production optimization method and system based on inter-well connectivity

Abstract

The invention belongs to polymer flooding of a tertiary oil recovery technology, in particular to a polymer flooding production optimization method and system based on inter-well connectivity. According to the polymer flooding production optimization method and system based on the inter-well connectivity, the primary option is that an oil deposit is simplified into a series of inter-well connectivity unit bodies, the shunt volume of all well points are obtained through calculation, and an initial polymer flooding connectivity model is established; then characteristic parameters of the initialpolymer flooding connectivity model are adjusted, and the optimized polymer flooding connectivity model is generated; and finally constraint conditions are combined, a polymer flooding optimal controlmodel is set up, and the polymer flooding index when the economic net present value is maximum is solved, and scene injection-production plan design is instructed. According to the polymer flooding production optimization method and system based on inter-well connectivity, the connectivity model of polymer flooding production-polymer concentration can be quickly predicted, the actual production data are combined so that historic matching is conducted, the polymer flooding optimal control model is solved through an optimization algorithm, adjustment and control of liquid production capacity and polymer injection concentration in each stage can be automatically realized, the oil production volume is increased, the economic benefits are improved, and scene injection-production plan design isinstructed.

Description

technical field [0001] The invention belongs to polymer flooding of tertiary oil recovery technology, in particular to a production optimization method and system of polymer flooding based on inter-well connectivity. Background technique [0002] Polymer flooding is currently the most widely used tertiary oil recovery technology in China. Onshore oilfields such as Daqing, Shengli, Dagang, and Henan have all carried out industrial applications of polymer flooding, and achieved good results in enhanced oil recovery. However, the conditions of polymer flooding in offshore oilfields are relatively poor. To implement polymer flooding in offshore oilfields, it is necessary to maximize oil recovery within a limited platform life. The serious heterogeneity of the oil layer makes the polymer break through and flow along the dominant seepage channel, which has a negative impact on the polymer flooding effect. Therefore, it is necessary to accurately predict the dynamic index and optim...

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Problems solved by technology

However, the conditions of polymer flooding in offshore oilfields are relatively poor. To implement polymer flooding in offshore oilfields, it is necessary to maximize oil recovery within a limited platform life. The heterogeneity of the oil layer is serious, which makes the polymer rush to channel along the seepage dominant channel, which has a negative impact on the polymer flooding effect. Therefore, it is necessary to accurately predict the dynamic index and optimize the development method when using polymer flooding

[0003] Numerical simulation is a commonly used method for predicting polymer-driven state indicators, but the geological modeling workload in the early stage is large, and the accuracy of geological modeling directly affects the prediction results of dynamic indicators. The entire numerical simulation process takes a long time to calculate, which leads to limited limit

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