| 摘要 |
PURPOSE:An adjustor for drilling mud, obtained by reacting sodium humate, etc. with sodium acrylate, etc. at a specific ratio in the presence of a radical polymerization initiator, containing no harmful heavy metal, e.g. Cr, having improved dispersibility, salt resistance and heat-resistance stability, and useful for oil wells, etc. CONSTITUTION:A adjustor obtained by reacting (A) 100pts.wt. sodium or potassium humate with (B) 30-300pts.wt. sodium or potassium acrylate in the presence of a water-soluble radical polymerization initiator, e.g. hydrogen peroxide or ammonium persulfate, in an aqueous solution preferably at 50-100 deg.C for 30min-4hr by adjusting the concentration of the reactants to usually 10-40wt% in the reaction and the pH of the aqueous reaction solution to usually 5-10. The aqueous solution of the above-mentioned reaction product may be directly used as the mud adjustor, but usually is granulated or powdered by drying for use.
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