Sidetracking is one of the most effective technologies that allows increasing oil production while expanding reserves and increasing oil recovery fr om reservoirs, returning oil wells to operation. In the region wh ere LUKOIL-Western Siberia LLC operates, these fields include Vatieganskoye, which has been developed since 1985. The main problem with sidetracking in this field is the section of unstable clay-argillite rocks (Pokachev-Savoy rock unit), drilling-in at large zenith angles, as well as transit and target productive formations with abnormally low formation pressures. At present, a set of measures has been formed that allow preventing the occurrence of accidents and complications horizontal sidetracking in incompatible conditions, reducing unproductive time. The activities include: optimization of the candidate well selection process for the sidetracking; pre-design and research work to improve the design, formulation of drilling mud, wiring technology and completion of sidetracks; conducting pilot tests; construction and updating of geomechanical models.
The positive results of introducing an integrated approach for well reconstruction using sidetracking method in incompatible geological and technological conditions made it possible to construct sidetracks with multilateral horizontal completion, which ensured an increase in drainage area and well productivity. The current experience and technical and technological solutions were widely used in sidetracking operations and in production drilling in difficult conditions.
References
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