The article presents the results of testing the previously unused type of well completion at the Bashkirian target of Chutyrsko-Kiengopskoye field. The reservoir is represented by limestones and dolomitized limestones, characterized by high fragmentation and the presence of a nitrogen gas cap both at the overlying Vereiskian deposits and directly in the target object. Until now, the object is being developed by directional and single horizontal wells. Taking into account the features of the geological section, as well as the proximity to the water-oil contact of the marginal part of the field, the criteria for choosing the drilling zone were formed. The analysis of early drilled wells using the technology of multilateral wells at the fields of Udmurtneft named after V.I. Kudinov was carried out. Based on the experience gained, criteria for selecting the optimal well drilling zone using Fishbone technology at the fields of Udmurtneft named after V.I. Kudinov were formed. An approach is applied to determine the optimal well profile and the number of boreholes using a sector geological and hydrodynamic model and the obtained economic models. Drilling of the well was carried out on two layers of the Bashkirian target (drilling of the main hole along the A42 layer with access to the A40 layer). The results of drilling multilateral horizontal wells using Fishbone technology in a highly fragmented carbonate section make it possible to increase the flow rate in comparison with horizontal and directional wells due to a significant increase in the effective penetration through the productive reservoir. Based on the positive results of technology testing, its further replication is planned. Also, to date, testing of the Dovetail multilateral well technology is underway at the Vereiskian rim of the Chutyrsko-Kiengopskoye field.
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