Abstract
In this paper, by «virtual tracers» we mean a technique useful in hydrodynamic simulations. The technique is to trace all injected water in a geological and hydrodynamic model (GHDM) of an oilfield. Firstly, this approach allows one to trace paths of injected and formation water both laterally and vertically. Secondly, it allows one to estimate the «safe» duration of injection, i.e. a period when injection affects without watering neighboring producers. Thirdly, in the context of a GHDM, it can be considered as a tool for forecasting injection effect and planning geological and technical actions. The paper suggests an approach to solving the injector-producer interaction problem in the context of GHDM using virtual tracers. The purpose is not only to estimate injector-producer interaction dynamics but also quantify the separation of produced water into formation water and injected water. An example of integral injected water front simulation is presented and field area distribution of virtual tracers is calculated. We also show how to calculate the injector-producer interaction ratio, the effect of switching a producer to injection, and the forecast of the «safe» duration of injection. Verification of the technique is done by comparing the calculated concentration of a tracer with results of actual chemical analysis of water produced by the same wells. The corresponding statistics is presented.
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