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.

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