The paper considers at the process of control and studies in the wells of the Srednebotuobinskoye field of Rosneft Oil Company, and describes the results of PLT performed in the course of pilot operations in multilateral wells with autonomous inflow control devices. Main pay interval Bt (75%) is in under-gas zone in a small oil rim of ten meters in thickness. A conventional approach to developing contact reserves is by horizontal wells with a drawdown applied to the reservoir. According to the strategy of Rosneft Oil Company, the share of highly productive horizontal wells shall be at least 40% of the well stock. Use of horizontal wells as the base case technology helped significantly increase the efficiency of developing the field. The initial productivity index of horizontal wells (design horizontal length of 1250 m) on the average came to 100 m3/(day⋅MPa). Going forward, the improvement in development technologies for gas/oil/water zone of the field is achieved through multilateral wells (the total length of the main borehole inside the pay interval is 1250m + seven lateral holes of 500m each). The initial productivity index increased on the average to 500 m3/(day⋅MPa). Complex design wells required high precision control systems. The wells were equipped with continuous pressure monitoring gauges, which helped quantify the productivity of multilateral wells and obtain monitoring data on reservoir energy. Production logging tests conveyed by downhole tractor and CT, as well as Y-tool-based clean-up, allowed testing the entire cased section of the main borehole, identifying the working intervals in horizontal sections, and obtaining a qualitative assessment of sidetrack and autonomous inflow control device (AICD) efficiency. Use of PLT for inflow control in a horizontal section helped prove the efficiency of multilateral wells. Dependency of productivity on the effective length of a horizontal section is obtained. The results provide grounds for scaling up the pilot studies.
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