Oil-based drilling fluid shear strength-improving agent with aluminum phosphate structure and preparation method thereof

• Main Authors: SUN MINGBO, ZHONG HANYI, MAO QIANGQIANG, ZHANG YADONG, ZHAO XIN, FEI DONGTAO, CAO JIE, MENG LINGWEI
• Format: Patent
• Language: Chinese; English
• Published: 19.04.2017
• Subjects: ADHESIVES; CHEMISTRY; DYES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; POLISHES

The invention relates to an oil-based drilling fluid shear strength-improving agent with an aluminum phosphate structure and a preparation method thereof. The preparation method comprises the steps of firstly, enabling hydroxyl-containing unsaturated monomers, alkyl alcohol, phosphorus pentoxide and oil soluble unsaturated monomers to perform esterification and polymerization reaction under the condition that an initiator exists, so as to obtain a mixture of alkyl phosphate and a polymer with a phosphate ester structure; and then, with aluminium salt adopted as a cross-linking agent, carrying out coordination cross-linking on phosphate ester in the mixture, so as to obtain the oil-based drilling fluid shear strength-improving agent with the aluminum phosphate structure. The molecular weight of the polymer component in the shear strength-improving agent can be controlled, an intermolecular network structure is formed under strong coordination cross-linking action of phosphate ester and aluminium salt in the mo