Integrated approach to replication of well drilling technology with optimized design for the Tailakovskoe and Zapadno-Ust-Balykskoe fields in the perimeter of the company “Slavneft-Megionneftegaz”

Background. The “Optimized Design” technology of well design is based on a set of measures aimed at reducing the cycle and cost of well construction. For the first time, this drilling method was tested at «Slavneft-Megionneftegaz» in July 2017 at a part of the right-bank group of fields.

Despite difficult geological conditions, the new approach to improving drilling efficiency is planned to be replicated at the Taylakovskoe and Zapadno-Ust-Balykskoe fields, where the bulk of well construction is currently underway. Aim. In order to optimize the existing design of horizontal wells at the Taylakovskoe and Zapadno-Ust-Balykskoe fields, an integrated approach was implemented, including the selection of the optimal horizontal well design and minimization of drilling risks by building a one-dimensional geomechanical model.

Materials and methods. Based on the results of the analysis of experience in the use of two-string assemblies, a comparative analysis of typical three-string and two-string assemblies was carried out, applicability criteria for these fields were identified, and economic and technological forecast parameters were evaluated.

When building a geomechanical model through additional research work: injectivity test “Leak-off Test”, cross­dipole acoustic logging, as well as special studies on the core, it was possible to determine the “safe” drilling window, hydraulic fracturing gradients, manifestations and losses, issue recommendations for mud densities and well design.

Results. Because of the work, the conditions for the safe replication of well drilling technology according to the “Optimized Design” for the Taylakovskoe and Zapadno-Ust-Balykskoe fields were determined; candidates were selected and calculated for testing of the work methodology.

Conclusions. An integrated approach to replicating well drilling technology based on an optimized design at the Taylakovskoe and Zapadno-Ust-Balykskoe fields will ensure the possibility of trouble-free and safe work and reduce the cost of well construction.

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