Improved oil recovery of high-viscosity oil pools by combined steam injection and physicochemical stimulation

L. K. Altunina, V. A. Kuvshinov, S. O. Ursegov, M. V. Chertenkov

Research output: Contribution to conferencePaperpeer-review

Abstract

Presented are the results of laboratory research and field tests of physicochemical technologies intended to improve oil recovery of high-viscosity oil pools developed by steam injection (SI). To increase SI efficiency we proposed to combine it with physicochemical methods using gel-forming systems to increase reservoir coverage and oil-displacing systems to provide additional oil displacement. Two IOR technologies have been developed with thermotropic gel-forming polymer and inorganic systems, which under surface conditions are low-viscosity aqueous solutions, whereas under reservoir conditions they are converted into gels. Gelation time ranges from some minutes to several days at 30-320°C. In 2002-2006 pilot tests were carried out in Russia and China. Since 2007 technologies are commercially used, 124 wells were treated, additional oil production amounted to 340 thou tons. We developed technology alternating SI and physicochemical stimulation with oil-displacing systems based on surfactants, generating CO2 and alkaline buffer solution in situ. Pilot tests were carried out in Russia and China. At steam flooding water cut decreased by 10-20%, oil production rate increased by 40%. At cyclic steam stimulation oil production increased 1.8-2.3 times and prolonged for 3-5 months, oil viscosity decreased 3 times. The systems are commercially produced in Russia and China.

Original languageEnglish
DOIs
Publication statusPublished - 2012
Externally publishedYes
EventSt. Petersburg 2012 International Conference on Geosciences: Making the Most of the Earth's Resources - Saint Petersburg, Russian Federation
Duration: 2 Apr 20125 Apr 2012

Conference

ConferenceSt. Petersburg 2012 International Conference on Geosciences: Making the Most of the Earth's Resources
Country/TerritoryRussian Federation
CitySaint Petersburg
Period2/04/125/04/12

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