DBPapers
DOI: 10.5593/SGEM2016/B13/S06.110

OPTIMIZATION OF DRILLING MUD COMPOSITION

B.Ratov, M. Ayazbay, M. Ibyldaev, M. Seksenbai, T.Zhanabayev
Tuesday 6 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-57-5 / ISSN 1314-2704, June 28 - July 6, 2016, Book1 Vol. 3, 875-882 pp

ABSTRACT
Easily dispersible clay layers are meet in some oil and gas fields of Kazakhstan. Such clays of near wellbore zone swell and cause tight hole and cavingsunder the influenceof watermud filtrate while drilling. These problemsresultconsiderable lossof time and increase ofdrilling operations costs. An effective method to prevent clay swelling is the use of drilling fluids. Their structure, among other components, includesinhibitors,which reducenear wellbore zoneclaydispersibility, andstabilizers, that preventcoagulationof thedrilling fluidunder the action ofthe inhibitor carried by those drilling fluids. Aim of the work – to find optimal drilling fluid composition for drilling conditions in Kazakhstani oil and gas fields, according to criteria of effective prevention of clay swelling at minimum costs. The paper contains results of laboratory and industrial research in quantitative and qualitative effects of reagents on the operating parameters of the drilling fluids. The methods, which can reduce drilling fluid costs significantly by using less expensive reagents, have also found theirjustificationin this article. Thus,a significantstep forward was done in solvingthe problem ofdrillingshalerocks.

Keywords: drilling, well, clay, drilling fluid, composition, reagents