The paper presents an approach to a development of hard-to-recover reserves using horizontal wells with multistage hydraulic fracturing and modified development systems. In order to minimize the risks of drilling and optimize development plan, a systematic integrated approach is used, which includes analysis of geological and geophysical information (including special tests), interpretation of seismic data, analysis of actual production, construction of geological and hydrodynamic models using detailed lithological and facies analysis. Feature of this approach is that this work is carried out on an ongoing basis and adjusted to new incoming information.
For Achimov and Tyumen formations are characterized by high lithological-facies heterogeneity and difficulty of forecasting technological indicators shows design approaches and the results of scientific-engineering support of pilot projects. Multiple simulation of optimal system development for specific areas with the involvement of 3D hydrodynamic simulations showed that the systems of the horizontal and vertical wells 1:2 (base case) and horizontal injection wells for weak connecting sublayers are the best. Spacing between producer and injection rows is recommended to tight up to 200 m for oil thicknesses more than 12 m.
Based on simulation study piloting areas were selected. Currently pilot program is under implementation. The first results of experimental works confirm an efficiency of selected decisions. Successful implementation of pilot assessments leads to retranslate new systems to geological similar analogues.
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