ACRYLIC REAGENTS (EN: acryl reagents; DE: Akrylreagenzien, Akrylreagens; FR: agents acryliques; ES: reactivos acrilicos; RU: акриловые реагенты) in drilling are the synthetic polymers, which are used mainly as the heat and salt resistant decreasers of the yield of the water of the drilling and backfill fluids.
They distinguish the water soluble acrylic reagents, which are stable in the medium of the drilling fluid of the temperature of less than 160-180 degrees Celsius (hydrolyzed polyacrylonitrile (hypan), polyacrylamide, and others), and soluble in the dilute solutions of the alkali, stable up to 200-250 degrees Celsius (metas, M-14 methacrylate copolymers). Acrylic reagents with polyvalent cations form water insoluble salts. The optimal additions of the acrylic reagents for the decreasing of the yield of the water of the drilling fluids are 0.5-2.0 % of the mass of the solution, and of the backfill fluids are 1.5-2.0 %.
They also use the acrylic reagents in the solutions with the content of the solid phase as the selective flocculants (polyacrylamide, metas), the additions are 0.01-0.15 %; for the improving of the quality of the bentonites during their production in the combination with the sodium carbonate, the additions are 0.2-0.3 %; as the inhibitors of the swelling in the intervals of the drilled wells, which are formed by the unstable rocks, the additions are 0.15-0.3 %.
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