The article deals with the issues of reducing the swelling process of unstable clays due to their inhibition, since scree and collapses of unstable clay rocks are still one of the actual problems that arise when drilling wells. Laboratory studies were aimed at preventing swelling of clays due to combined inhibition of them, namely, by introducing an inorganic inhibitor of clays potassium chloride (as a factor of ion exchange) and sulfated asphalt (as a factor of creating a waterproof barrier in the pores and channels of drilled rocks) into the formulation of drilling mud (emulsion drilling mud). Based on the results obtained in the course of laboratory studies for the construction of wells, when passing intervals with clay deposits prone to hydration, it is recommended to use an emulsion drilling mud, the composition of the formulation of which is introduced potassium chloride and sulfated asphalt.
The use of this type of drilling mud, additionally enhanced with clay inhibitors, will prevent hydration and shedding of clays and, thus, reduce the likelihood of technological accidents and incidents.
the drilling of wells; inhibition of clays; inhibitors of clays; drilling fluids
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V.N. Kuzmin, candidate Sciences, head of department Department of BNGS, of the "Udmurt state University", Institute of oil and gas name M.S. Gutserieva, Izhevsk, Russian Federation
T.V. Trefilova, senior lecturer of the Department of BNGS, Udmurt state University, Institute of oil and gas name M.S. Gutserieva, Izhevsk, Russian Federation
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