Evaluation on MAM copolymer as oil well cement retarder
Retarder MAM is prepared from copolymerization of 2-acrylamide-2-methyl-opanesulfonic acid(AMPS) and maleic acid(MA).The optimum technology processes to prepare MAM are investigated using orthogonal experiment;the structure of the product which is synthesized in optimum thickening time is tested and verified by FT-IR.The thickening time,compression strength of cement slurry is tested using the thickening test,strength-resistant test and salt-resistance test.The compression strength of cement rock added a certain amount of retarder is greater than the standard of 14 MPa(SY-T5504-2005 estimative methods of oil well cement retarder) after 24 h.The results show that the good effects of thickening performances can be obtained under the optimum reaction conditions of reaction temperature 70 ℃,reaction time 4 h,n(AMPS)∶n(MA) 2∶1,mass faction of initiator 1%.