Water blocking removing agent for removing tight reservoir water blocking damage and tight reservoir water blocking damage removing method

• Main Authors: WANG GUOZHUANG, WU JIANBIAO, LEI TAO, DING JINGCHEN, HE YUN, CAO TONGSHENG
• Format: Patent
• Language: Chinese; English
• Published: 07.05.2024
• 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 relates to a water blocking removing agent for removing tight reservoir water blocking damage and a tight reservoir water blocking damage removing method, and belongs to the technical field of oil and gas field development. The water lock removing agent mainly comprises a supercritical fluid and an entrainer dispersed in the supercritical fluid, wherein the entrainer comprises a surfactant, a wetting improver, a reservoir drying agent and a corrosion inhibitor. According to the water blocking removing agent, the supercritical agent with ultralow viscosity and high solubilization performance serves as the main agent, the entrainer dispersed in the water blocking removing agent can be injected into the stratum more easily, and then the water blocking removing effect is improved; and meanwhile, the injected water block removing agent can greatly improve the fluid flowing capacity and the water block removing effect in the reservoir after being injected into the reservoir through the action mechanis