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Vol. 161, Issue 12, December 2013, pp. 234-240




Design and Optimization of Downhole Oil-water Separation System for High Volume in Oil Recovery
Tingjun Yan, Haoqiang Ti, Ri Cui

College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
Tel.: +86-10-64444799, fax: +86-10-84906101
E-mail: yantj555@163.com


Received: 18 September 2013   /Accepted: 22 November 2013   /Published: 30 December 2013

Digital Sensors and Sensor Sysstems


Abstract: With the water content of the produced fluid increasing greatly in offshore oilfield, this paper develops a downhole oil-water separation system used in 7" casing for offshore oilfield. Optimal flow distribution is obtained when angle ? of its pre hydrocyclone is 20 and angle ? of that is 3 through simulation and optimization; diesel-water separation test shows that with oil content of inlet being 10 % the separation efficiency is highest when the overflow diameter of pre hydrocyclone is 8 mm and that of de-oiler hydrocyclone is 6mm; oil-water separation test shows that oil content of underflow is not higher than 5?10-4; for the characteristic of large flow in offshore oilfield, this paper designed a downhole oil-water separation system used in 7" casing of which the flow rate is 300 m3/d.


Keywords: Downhole oil-water separation, Two-stage parallel hydrocyclone, Offshore oilfield, Simulation, Optimization.


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