| 摘要 |
Disclosed is a method of formulating a wellbore fluid comprising: dry coating a weighting agent with a dispersant to form a sized weighting agent coated with the dispersant, wherein the dry coating comprises at least one of thermal adsorption of the dispersant onto the weighting agent, heating a sized weighting agent to a temperature sufficient to react a monomeric dispersant onto a weighting agent to form a polymer coated weighting agent, or spray drying; providing a base fluid; and adding the sized weighting agent coated with the dispersant to the base fluid; wherein the weighting agent is at least one selected from barite, calcium carbonate, dolomite, ilmenite, hematite, olivine, siderite, manganese oxide, and strontium sulfate; wherein the dispersant comprises at least one selected from polyacrylate esters, poly(meth)acrylic acid, a homopolymer or copolymer of any monomer selected from acrylic acid, itaconic acid, maleic acid or anhydride, hydroxypropyl acrylate vinylsulphonic acid, acrylamido 2-propane sulphonic acid, acrylamide, styrene sulphonic acid, acrylic phosphate esters, methyl vinyl ether and vinyl acetate or salts thereof, carboxylic acids of molecular weight of at least 150 Daltons such as oleic acid and polybasic fatty acids, alkylbenzene sulphonic acids, alkane sulphonic acids, linear alphaolefin sulphonic acid, phospholipids such as lecithin, including salts thereof and including mixtures thereof; and wherein the base fluid is at least one selected from an oleaginous fluid, a nonoleaginous fluid, or mixtures thereof. |
