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http://dx.doi.org/10.7842/kigas.2018.22.4.39

An Optimal Design of Gas Lift in Offshore Oil Reservoirs Considering Oil and Injected Gas Composition  

Kim, Young-Min (Dept. of Energy and Resources Engineering, Chonnam National University)
Shin, Chang-Hoon (Gas Research Institute, Korea Gas Corporation)
Lee, Jeong-Hwan (Dept. of Energy and Resources Engineering, Chonnam National University)
Publication Information
Journal of the Korean Institute of Gas / v.22, no.4, 2018 , pp. 39-48 More about this Journal
Abstract
This study presents optimal design of gas lift considering composition of reservoir oil and injected gas which can affect gas lift performance in offshore oil reservoir. Reservoir simulation was conducted by using reservoir models which were built in accordance with API gravity of oil. The results of simulation reveal that oil production rate is considerably increased by gas lift when the reservoir productivity decrease. As a results of response curve analysis for gas lift using well models, gas injection rate to improve the production rate increases as the API gravity of oil decreases and the specific gravity of injected gas increases. The optimal design of gas lift was carried out using multiple lift valves. Consequently, gas lift can be operated at relatively low injection pressure because of decrease in injection depth in comparison to the single lift valve design. The improved oil production rates were analyzed by coupling between reservoir model and well model. As a results of the coupling, it is expected that natural gas injection in the heavy oil reservoir is the most efficient method for improving oil production by gas lift.
Keywords
Gas lift; Oil composition; Injected gas composition; Offshore oil reservoir;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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