摘要
以低失水量、低稠度系数(K)为目标,根据自由基聚合的原理,利用正交实验的方法,以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、丙烯酰胺(AM)、N,N-二甲基丙烯酰胺(NNDMA)和有机羧酸(DS)为反应单体,合成了一种耐高温油井水泥降失水剂。最佳合成条件为:单体AMPS、AM、NNDMA、DS摩尔比4∶2.5∶2.5∶1,单体加量32.5%,引发剂加量1.0%,pH值4,温度40℃。该条件下产物的水泥浆K值为0.041 Pa.sn,失水量31 mL。测试结果表明,降失水剂加量增加,水泥浆K值增加,失水量降低。降失水剂加量为2%时的K为0.361 Pa.sn,水泥浆流变性较好。在NaCl加量为30%、降失水剂加量为2%时,水泥浆失水量为31 mL,耐盐性较好。随温度升高,水泥浆失水量增加,稠化时间缩短,无"倒挂"现象。120℃和150℃下,含1%降失水剂水泥浆的失水量分别为36 mL/30 min和59 mL/30 min,耐温能力较好。
Aimed at good fluid loss control ability and low consistency coefficient value, a new fluid loss control additive was synthesized with 2-acrylamido-2-aethyl propane sulfonie acid （ AMPS）, acrylamide （ AM ）, N, N-dimethylacrylamide （NNDMA） and organic carboxylic acid （DS） by orthogonal experiment. The optimum reaction condition was obtained as follows： a combination of AMPS ＋ AM ＋ NNDMA ＋ MA in mole ratio 4：2.5：2.5：1, 32.5% total monomer dosage, 1.0% initiator dosage, 4 pH value, 40℃ reaction temperature. The consistency coefficient （K） was of 0.041 Pa.sn, and the API fluid loss was of 31 mL on the optimal conditions. The K value increased and the API fluid loss decreased when the dosage of fluid loss control additive increased. The K value was of 0. 361 Pa.sn with 2% fluid loss control additive dosage which indicated that the rheological behavior of slurry was excellent. When the salt concentration was of 30%, the API fluid loss of the slurry containing 2% synthesized additive was of 31 mL which was a very low value to the field staff. The API fluid loss increased and the thickening time of the slurry shortened with increasing temperature. When the concentration of the synthesized fluid loss control additive reached 1%, the fluid loss was of 36 mL/ 30 min and 59 mL/30 rain at 120℃ and 150℃, respectively, which indicated that the synthesized additive had good heat resistant ability.
出处
《油田化学》
CAS
CSCD
北大核心
2012年第2期151-154,166,共5页
Oilfield Chemistry
关键词
降失水剂
耐高温
油井水泥
共聚物
fluid loss control additive
thermal resistant
oil well cement
copolymer
