INVESTIGATION OF THE INFLUENCE OF SODIUM SILICATE CONCENTRATION ON THE STABILITY OF ARGILLITES UNDER LOADING

The process of well construction process can be accompanied by complications. Instability of Koshai clays during drilling of the Samotlor field negatively affects the technical and economic indicators during «big» drilling and sidetracking. technical and economic indicators during «big» drilling and sidetracking. sidetracks. The standard approach of increasing the density of drilling mud to ensure stability is limited. To ensure stability is limited by the resulting absorption and differential seizures of drilling mud. differential seizures of the drilling tool. An alternative approach involves the use of drilling fluids with anchoring properties, which includes silicate drilling mud.Development of any compositions of drilling fluids begins with laboratory studies. The most widespread are the following types of studies of the impact of solutions and their filtrates on rocks:— determination of deformation of pressed samples from disintegrated clays under loading in the medium of the studied drilling fluids;— determination of soaking (PWG-1);— determination of swelling (Vasiliev, Zhigacha-Yarov, etc.);— wetting determination (RD 39-2-813);— capillary suction time test;— separability of particles in aging cells during hot rotation in a roller furnace (State Standard 33696-2015);— aggregative hardness of samples (Bulk Hardness Test);— simultaneous determination of moistening and swelling (complex swelling meter, etc.).The most complex is the first of the listed techniques, it allows to quantitatively compare the steady state time under uniaxial compression of artificial cores in the studied media. High convergence is achieved due to the homogeneity of samples from disintegrated mudstones having a cylindrical shape. The height height-to-diameter ratio shall be at least 0.8.The aim of the work is to select a formulation of silicate drilling mud, providing the longest time of steady state of pressed samples from disintegrated Koshai clays under loading.Objectives:— to carry out literature analysis of formulations of silicate drilling muds;— to describe the methodology of sample preparation and research;— to carry out laboratory studies and analyze the results obtained.The novelty of the work consists in establishing the dependence of the influence of sodium silicate content on the steady state time of Koshai clay samples under uniaxial compression.