Abstract
The paper considers the current problem of sidewall sticking during surface casing in Samotlorskoye field. The analysis of geological and field material was carried out and the reasons for sticking during drilling of upper unstable argillaceous deposits of Lulinvorskaya, Talitskaya and Gankovskaya suites were determined. It is found that in most well construction projects, the inhibitory agents preventing clay hydration are used in drilling muds. The authors studied the mechanisms of shale inhibition. The results of experimental studies on the impact of various inhibitor additives on clay samples demonstrated the efficiency of Polysil and Osnova GS (hydrophobizated fluid) additives with sulphoacid. The results of the analysis made it possible to make proposals and recommendations to prevent sticking.
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