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Proactive control of cresting in homogeneous oil reservoirs:an experimental study

Petroleum Science 2017年第4期14卷 755-764页

作者： H.N.Akangbou M.Burby G.Nasr Petroleum Technology and Spray Research Groups Schoolof Computing Science and EngineeringUniversity ofSalfordManchester M5 4WTUK

This paper sets out to investigate experimentally the use of electromagnetic valves in controlling production of water during cresting from homogeneous non-fractured thick-oil and thin-oil reservoirs, based on the principle of capillarity and breakthrough time. A time half the initial breakthrough times was preset for the electromagnetic valve to close. The valve closed almost immediately at the set time thereby shutting oil production temporarily,causing the water and gas height levels to recede by gravity and capillarity with receding reservoir pressure. The efficiency of this technique was compared with an uncontrolled simulation case, in terms of cumulative oil, oil recovery and water produced at the same overall production time. From the results obtained, higher percentages in oil produced and water reduction were observed in the cases controlled proactively, with a 3.6% increase in oil produced and water reduction of 10.0% for thick-oil rim reservoirs, whereas only a small increment in oil produced(0.7%) and a lower water reduction of 1.03% were observed for the thin-oil rim reservoirs. Hence, the effectiveness of the cresting control procedure depends on the oil column height of the reservoir.

关键词： Homogeneity Capillarity cresting Breakthrough time

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The critical rate of horizontal wells in bottom-water reservoirs with an impermeable barrier

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Petroleum Science 2012年第2期9卷 223-229页

作者： Yue Ping Du Zhimin Chen Xiaofan Liang Baosheng State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation Engineering Southwest Petroleum UniversityChengduSichuan 610500China Chevron Energy Technology Company 1500 Louisiana StreetRoom 25002HoustonTX 77002 USA

Barrier impacts on water cut and critical rate of horizontal wells in bottom water-drive reservoirs have been recognized but not investigated quantitatively. Considering the existence of impermeable barriers in oil formations, this paper developed a horizontal well flow model and obtained mathematical equations for the critical rate when water cresting forms in bottom-water reservoirs. The result shows that the barrier increases the critical rate and delays water breakthrough. Further study of the barrier size and location shows that increases in the barrier size and the distance between the barrier and oil-water contact lead to higher critical rates. The critical rate gradually approaches a constant as the barrier size increases. The case study shows the method presented here can be used to predict the critical rate in a bottom-water reservoir and applied to investigate the water cresting behavior of horizontal wells.

关键词： Horizontal well bottom-water reservoir barriers critical rate cresting

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