CLAYLESS LIME DRILLING MUD

摘要

Clayless lime drilling mud contains water-soluble polymers (hypan), humates of alkaline metals (powdered coal- alkali reagent), calcium hydroxide, inert solid inorganic particles (barite) and water. In addition the mud contains lacris and/or guipanol, and /or starch and/or partially hydrolyzed polyacrylamide and/or carboxymethylcellulose and/or polyanion cellulose and/or biopolymer as water-soluble polymers, it contains humate-potassium reagent or polybur or polygum as humates of alkaline metals, and it contains drilled rock or chalk and so on as inert solid inorganic particles.