▎ 摘　　要

NOVELTY - Ultra-high temperature modified polymer cementing fluid loss reducing agent , comprises 0.1-2 pts. wt. graphene oxide, 0.1-1 pts. wt. an initiator, 12-48 pts. wt. 2-acrylamido-2-methylpropanesulfonic acid, 3-24 pts. wt. unsaturated amide, 2-12 pts. wt. unsaturated carboxylic acid, and 130-170 pts. wt. water. USE - The fluid loss reducing agent is useful in deep well ultra-deep well, complex natural gas well, non-conventional oil gas well and gas storage well under the working condition of well cementation. ADVANTAGE - The reducing agent has stable performance, strong temperature resistance of 30-240degrees Celsius, salt resistance to saturation, excellent water loss reducing performance, has strong adaptability and significantly improved mechanical properties of cement stone (enhancing and toughening), which can meet the requirements of deep and ultra-deep wells, complex natural gas wells, unconventional oil and gas wells and gas storage wells and other complex conditions of cementing technology requirements. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the reducing agent , comprising (1) placing graphene oxide in water, and performing ultrasonic dispersion treatment, (2) adding initiator to react with gained solution, and (3) dissolving 2-acrylamido-2-methylpropanesulfonic acid, unsaturated amide and unsaturated carboxylic acid, adjusting the pH value, and adding the solution into the solution obtained in step (2) to react and obtaining ultra-high temperature modified polymer cementing fluid loss reducer.