Synthesis and performance evaluation of terpolymer high temperature retarder for oil well cement

With the increase of energy demand in the world, the exploration of deep and ultra-deep wells is increasing, which also puts forward higher requirements for cementing quality. Among them, retarder is a key material to ensure the safety of cementing operation. In view of the poor temperature resistance of conventional retarder, this paper introduces temperature-resistant and salt-resistant groups, optimizes the molecular structure design, and uses 2- acrylamido-2-methylpropanesulfonic acid (AMPS), maleic acid (MA) and polycyclic cycloolefin lactam (NX) as monomers to synthesize high temperature resistant retarder (AMN) by free radical aqueous solution polymerization and used as high temperature retarder in oil well cement. The results show that polymer retarder AMN has certain molecular weight and excellent temperature resistance. The performance evaluation results show that AMN has a good retarding effect at 140 degrees C and has no adverse effect on the development of mechanical strength of cement paste. AMN can solve the problem that conventional retarder is easy to fail at high temperature, and it has a good application prospect in deep and ultra-deep well cementing.