NEW APPROACH TO SIMULATION AND EFFICIENCY PREDICTION OF PRECIPITATION AND GEL ENHANCED OIL RECOVERY METHODS

Abstract

Link for citation: Fedorov K.M., Gilmanov A.Ya., Shevelev A.P. New approach to simulation and efficiency prediction of precipitation and gel enhanced oil recovery methods. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 5, рр.85-93. In Rus. Relevance. The problem of conformance improvement by precipitation and gel technologies application may be associated with mathematical objective with infinitesimal parameter in which size of gel plug placement in the near wellbore zone of injector is significantly less than interwell distance. Existing approaches to modeling this problem do not allow describing all the effects associated with low-volume injections. The objective of the article is to suggest the approach to simulation and efficiency prediction of precipitation and gel injection technologies. Objects: oil reservoirs on which precipitation and gel enhanced oil recovery methods are used. Materials and methods. New approach to modeling such a problem consists of gluing the optimization objective of injection profile conformance and objective of the prediction of surrounding producers’ response. This approach is briefly described in the paper and is validated by the comparison of calculated data with the results of statistical processing of the data of precipitation and gel enhanced oil recovery technologies application on the fields of one of Russian oil companies. Results. Processing of the accumulated field experience in the use of these technologies has shown that the specific values of additional oil production after the operation of conformance improvement grow with the increase in the introduced criterion of processing efficiency – the conformance improvement coefficient and, conversely, decrease with a drop in the well injectivity coefficient after processing. The proposed approach to forecasting and evaluating the effectiveness of the use of technologies to conformance control is the basis of a line of mathematical models for the use of gel, precipitation and suspensions injection technologies.