JSAER2016-03-04-169-174 - Available online www.jsaer.com Journal of Scientific and Engineering Research 2016 3(4:169-174 Research Article ISSN 2394-2630

JSAER2016-03-04-169-174 - Available online www.jsaer.com...

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Available online Journal of Scientific and Engineering Research 169 Journal of Scientific and Engineering Research , 2016, 3(4):169-174 Research Article ISSN: 2394-2630 CODEN(USA): JSERBR Optimization of Oil Rim Development by Improved Well Design Aladeitan Yetunde M 1,2 , Akinyede Opeyemi M 2 1 Department of Petroleum Engineering, African University of Science and Technology (AUST), Abuja, Nigeria 2 Department of Chemical Engineering University of Abuja, Nigeria Abstract The goal of an oil field development project is to accelerate the hydrocarbon production and maximize recovery at the lowest cost. Optimizing the production of oil from thin oil rims reservoirs poses a major challenge in the oil and gas industry as a result of the coning tendencies which in turn limits the ultimate recovery from the reservoir. Successful oil rim development requires careful management of a wide range of subsurface uncertainties and generally lengthy study efforts are needed to assess technical and economic feasibility. Optimal well design is very important so as to get as much oil from the thin oil rim reservoir as possible. Reduced oil or gas production and increased operating expenses all lead to reduced revenues. In this study a comparison will be made between vertical and horizontal well to ascertain the design that produces results in higher oil recovery and lower water and gas coning. The results show that advantages of reduced water coning into the well bore for the horizontal well in comparison to the vertical well is time dependent and the cumulative oil produced in the use of the horizontal well is far higher than oil produced using the vertical well. Keywords Oil rim, Horizontal Well, Vertical Well, Oil recovery, Optimizing, Well Design Introduction An Oil rim reservoir is a reservoir with small oil columns enveloped between a large gas cap and a water zone at the base. Most oil rim reservoirs are overlain by massive gas cap and pose serious operational and economic challenges using existing conventional methods of optimizing reservoir development. The presence of a wide range of uncertainty, the peculiar complexity in the distribution of the resident fluids and geological strata geometry, have made efficient development and production of thin oil column a difficult task. The rims are thin with huge gas column on top and are generally considered marginally economic for development by many operators. Oil rim production can suffer from low oil recovery due to water coning and gas coning. Gas cap oil re-saturation is also a major cause of low oil recovery in oil rim reservoirs, this occurs when an oil column is displaced upwards during production from gas cap under an active water drive, in this case a zone of residual oil is left behind the advancing water leading to loss of mobile oil and trapping of gas.
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