The paper discusses construction of a multilateral well in two horizons (Vereiskian and Kizelovskian) using a retrievable whipstock and a specialized remover as an alternative to drilling two horizontal wells. Multilateral technology is particularly required for green small fields with non-uniform permeable reservoirs since their development with vertical wells is uneconomical. As for the mature fields, development of secondary targets using multilateral technology is equal to a new field discovery with developed infrastructure.
Ready-to-use equipment can be shipped by any mode of transportation. OI-168 whipstock is assembled at the wellhead by cross-threading and is connected to a cutters assembly. Window cutting is performed in one trip. There is possibility to drill a sidetrack pilot section with a window-cutters assembly. The tools easily passed through the window during sidetrack drilling, casing and conditioning. A specialized remover tool was used for whipstock pulling. OI-168 whipstock can be pulled out of hole as a unit, without any parts left for drilling out.
Once the well was drilled, a dual-completion system was installed and the well was put on stream at initial flow rate of 9.43 t/d, with 5% watercut and 50×50 % distribution of production from the horizons. Application of this equipment during construction of 16070g dual well in the Shegurchinskoye field proved viability of methods and technology developed by TatNIPIneft Institute for drilling multilateral wells with 186-mm and 146-mm casing strings.
References
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