«Oilfield engineering»

EXPERIENCE OF DRILLING WELLS IN THE INTERVALS OF HIGHLY SWELLING "REACTIVE" CLAYS ON THE EXAMPLE OF THE DENISOVSKY LICENSE AREA

UDC: 622.244.442.063(470.13)
DOI: 10.33285/0207-2351-2021-11(635)-79-84

Authors:

¹ LUKOIL-Engineering PermNIPIneft Branch Office in Perm, Perm, Russian Federation
² LLC "LUKOIL-Komi", Usinsk, Republic of Komi, Russian Federation

Keywords: oil-based mud, Water-based mud, the Denisovsky license area, Well stability, wellbore Instability, clay swelling, clay hydration inhibitor, set of measures

Annotation:

When drilling intervals for a 245 mm diameter casing string at the fields of LLC "LUKOIL-Komi" located within the Denisovsky license area, a large number of complications are noted in the form of tightening and landings, gland formation, non-passing and sticking of drill and casing strings. These complications are accompanied by a significant cost of time and money to eliminate their consequences. The paper discusses the results of wells drilling in the intervals of highly swelling "reactive" clays. The features of the geological structure of the drilling interval are presented. The experience of drilling with the use of water-based drilling fluids with the use of fresh polymer clay solutions, based on acrylic polymers, as well as the results of testing of highly inhibited muds on a fresh and mineralized basis are presented. The results of water-based muds testing showed that the problem of loss of wellbore stability has not been completely solved. In order to improve the technical-economic indicators of drilling, field tests of oil-based mud (OBM) were carried out. The use of OBM made it possible to avoid complications associated with wellbore instability and swelling of plastic clays. A reduction in the construction time of intervals has been achieved. A set of technological measures aimed at preventing complications during the construction process has been proposed. The OBM technology for drilling an interval for a 245 mm diameter casing string is a ready-made solution to prevent complications associated with wells walls destabilization.

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