This multidisciplinary study is dedicated to an integrated approach to formation evaluation while drilling. The article focuses on the important issue of mitigating risks associated with the design and construction of horizontal wells. This work summarizes practical experience of logging while drilling (LWD) methods, results of well site cuttings analysis and points up the need to use seismic data in the field development stage for horizontal well planning and geosteering while drilling. The analysis was conducted using data from two fields located on the Frolov NGO territory. Their geology is characterized by low gross thicknesses, thin interbeddings of sandstone and siltstone, high compartmentalization, low permeability, presence of zones with poor reservoir properties and block structure of the fields. Development of comlex reserves required a detailed geological model of the reservoir indicating high risk zones where faults meet. When drilling through thin formations it is critical to ensure accurate wellbore placement with the geological structure in mind in order not to exit the reservoir. The article shows the potential of using advanced methods and technologies enabling optimum wellbore placement within the oil reservoir. This approach will be of interest to specialists in horizontal wells design and construction. The integrated approach to drilling and minimizing risks of reservoir exit can be applied to any field being developed.

Реɜюмe The paper presents assisted history matching methods for the preparation and modification of the simulation model parameters (absolute permeability, relative permeability, etc.)). The proposed approaches allow both to speed up the history matching process and improve the accuracy of the simulation results.

The paper presents a study of field development optimization of the large tight oil field in West Siberia. The field is at an early development stage and is characterized by low permeability (less than 1 mD). It is developed by horizontal wells with multistage hydraulic fracturing. Analysis of available information about the field revealed the potential to improve field development efficiency. Field development analysis and optimization were carried out based on the experience of development of similar Canadian reservoirs. Two large fields were selected as analogues: Bakken ViewField and Pembina Cardium. The data on these fields is publicly available. These fields are developed during a long period of time enabling operating companies to learn from experience and use new knowledge and data to optimize completions systems and development strategies as a whole. Therefore it is possible to not only analyze the current field development stage, but also trace the evolution of approaches and assess, what benefits can be obtained from making various changes to the applied technologies and field development strategy. The positive experience of development of the Canadian fields formed the basis for the field development optimization options. A set of suggested project decisions will enable improvement in field development efficiency and, in case of confirming by pilot projects, can be recommended for full-field implementation in the considered field and in the analogue fields.

Cyclic water injection belongs to the group of EOR methods but the incremental recovery from its impact is poor and is comparable with accuracy of the total production measurement. So application of such treatment we call advanced waterflood.Physical mechanism of oil recovery increase by cyclic water injection is a well-established phenomenon although the theory does not define the location of wells with periodical injection, amplitudes of injection variation and duration of cycles.In this paper the authors describe the framework of investigation for determination of the unknown parameters on the basis of streamline reservoir simulation.The streamline calculation gives comprehensive visualization and quantitative description of the process and makes apparent the search of effective variant of the technology. The calculations were performed on the South-Usanovskoe formation of Urnenskoe oil field.

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