DOI: 10.5593/SGEM2014/B12/S2.021


K.Kovalev , S.Makarshin
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-08-7 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 2, 155-162 pp

High content of clay minerals in pay zone rocks makes clay swelling a serious problem for the West Siberian oil fields. Water based well kill fluids are very popular, easy to use and they need to be upgraded. Laboratory and filtration studies to upgrade water based well kill fluids were carried out. Laboratory clay swelling tests were made on Jigach and Yarov apparatus. Clay swelling test scheme included initial clay aquation with distilled water for 24 hours then water was changed to testing fluid for 7 days and then changed back to water for the next 32 days. During the laboratory tests a cationic in sodium chlorite brine synergetic effect on clay inhibition was discovered. All filtration tests were made on oil recovery factor test equipment and according to similar procedures. Filtration studies showed sodium and calcium chlorite brines oil permeability restoration low effect after single and multiple flushes on Jurassic polimict rock samples. Also a wettability impact on oil permeability restore after well kill fluid flush was shown. Cationic surfactant well kill fluid enhancement resources were observed.

Keywords: Kill fluid, cationic surfactant, clay swelling inhibition, permeability restore, wettability.