Inverse emulsion of acrylamide polymer and application of same as supramolecular coating agent to water-based drilling fluid

• Main Authors: XIAO FENGFENG, DENG YU, WANG MIN, SHI HE, MA GUANGCHANG, QIN YONG, XIE XIANTAO, WANG KAI, YANG LILI, LI XINLIANG, ZHANG KUN, JIANG GUANCHENG
• Format: Patent
• Language: Chinese; English
• Published: 29.10.2019
• Subjects: ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention specifically relates to an inverse emulsion of an acrylamide polymer and application of the same as a supramolecular coating agent to a water-based drilling fluid, belonging to the fieldof oil-gas drilling. The constitutional unit of the acrylamide polymer is composed of a structural unit as shown by a formula (1), a structural unit as shown by a formula (2), a structural unit as shown by a formula (3), and a structural unit as shown by a formula (4); and the number average molecular weight of the acrylamide polymer is in a range of 200,000 to 2,000,000. When the acrylamide polymer inverse emulsion obtained in the invention is used as the coating agent, the inverse emulsion has excellent temperature resistance and can be used for a high-temperature shale formation. 本发明涉及油气钻井领域，具体涉及丙烯酰胺类聚合物反相乳液及其在水基钻井液中作为超分子包被剂的应用。该丙烯酰胺类聚合物的结构单元由式(1)所示的结构单元、式(2)所示的结构单元、式(3)所示的结构单元和式(4)所示的结构单元构成；所述丙烯酰胺类聚合物的数均分子量为20万-200万。本发明所得的丙烯酰胺类聚合物反相乳液作为包被剂使用时，具有优良的抗温性能，可用于高温页岩的地层。