Salt-tolerant calcium-magnesium-resistant polymer colloid system as well as preparation method and application thereof

• Main Authors: JIA HONGYU, MA TAO, LIU PING, XU GUANLI, TAN ZHONGLIANG, WANG YOUQI, LU GANG, LYU CHENGYUAN
• Format: Patent
• Language: Chinese; English
• Published: 12.01.2021
• Subjects: ADHESIVES; CHEMISTRY; DYES; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MINING; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PAINTS; POLISHES

The invention belongs to the technical field of chemical oil-displacing agents for oilfield development, and particularly discloses a salt-tolerant calcium-magnesium-resistant polymer colloid system,which contains a polymer, an auxiliary agent and water, and the auxiliary agent is a mixture containing a dispersing agent and a pH regulator; the polymer is an acrylamide polymer, the dispersing agent is at least one of polycarboxylic acid, polycarboxylate and an organic phosphorus compound, and the pH regulator is at least one of NaOH, Na2CO3 and NaHCO3; the polymer colloid system comprises thefollowing components in percentage by weight: 1000-3000mg/L of the polymer, 0.05-3 wt% of the dispersing agent, 0.01-1 wt% of the pH regulator and the balance of water. The polymer colloid system is uniform in dispersion, high in viscosity and wide in application range. 本发明属于油田开发化学驱油剂技术领域，具体公开一种耐盐抗钙镁聚合物胶体体系，该耐盐抗钙镁聚合物胶体体系含有聚合物、助剂和水，助剂为含有分散剂和pH调节剂的混合物；聚合物为丙烯酰胺类聚合物，分散剂为聚羧酸、聚羧酸盐和有机磷化合物中的至少一种，pH调节剂为NaOH、Na2CO3和NaHCO3中的至少一种；聚合物胶