Peculiarities of Thin Oil Rim Development
- Sergey Valentine Kolbikov (Novatek Inc.)
- Document ID
- Society of Petroleum Engineers
- SPE Russian Oil and Gas Exploration and Production Technical Conference and Exhibition, 16-18 October, Moscow, Russia
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 5.6.2 Core Analysis, 2 Well Completion, 2.4.3 Sand/Solids Control, 5.2.1 Phase Behavior and PVT Measurements, 5.2 Reservoir Fluid Dynamics, 6.5.2 Water use, produced water discharge and disposal, 5.8.8 Gas-condensate reservoirs, 5.5.2 Core Analysis, 5.7.2 Recovery Factors
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Thin oil rims associated with gas-condensate field development have one common problem - low oil recovery. The main reasons are fast gas and water conning of the producers resulted in sharp oil rate decline and low cumulative oil production per well. One of the main reasons of low recovery efficiency is that with oil saturated thickness less than 10 m most of oil in place volumes allocated to transition zones.
Thin oil rim development was studied based on the 3D numerical simulation of one of the pay zones in Low Cretaceous formation of Western Siberian gas-condensate field. Several development scenarios (on depletion, with water injection, with and without simultaneous gas production from cap, different well completion) were analyzed.
Thin oil rim development was studied based on hydrodynamic modeling of West Siberian gas-condensate fields with oil rims at Low Cretaceous sands. Analysis of several scenarios of oil rim development with different well completion, and gas cap development at different timing are given.
Several factors were estimated with strong impact on the effectiveness of oil rim development (oil rates decline, water cut and gas-oil ratio growth, cumulative oil production per well): capillary pressure definition, well completion (horizontal vs. deviated), gas production from cap. Derived several conclusions: cumulative oil production from thin rims is very sensitive to the capillary pressure value, horizontal completion is most effective for rim development; limited production from the gas cap simultaneously with oil production could lead to a higher oil recovery at certain geological conditions.
A number of gas-condensate fields with thin oil rims had been significantly increased for the last decade of field development. The major problem of its development is low oil recovery from the thin rims. Main reasons of low recovery are high initial water cut and fast gas and water conning that results in low cumulative oil production per well. One of the main reasons of low recovery efficiency is that with oil saturated thickness less than 10 m most of oil in place volumes belongs to transition zones. Reservoir engineers are challenged with the following questions: what type of well completion better to use, what will be an impact on oil recovery of early gas production or no gas production from the gas cap.
To answer these questions the classification of the factors that have an impact on the oil rim development efficiency and ultimate oil recovery is suggested.
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