DMAA/AMPS/DMDAAC/NVP四元共聚耐温耐盐钻井液降滤失剂的研制  

Preparation of DMAA/AMPS/DMDAAC/NVP Quaternary Copolymer Anti-temperature and Salt Resistant Filtrate Reducer for Drilling Fluids

作　　者：白秋月[1] 

机构地区：[1]中国石油大庆油田采油工程研究院,黑龙江大庆163453

出　　处：《油田化学》2017年第1期1-5,共5页Oilfield Chemistry

基　　金：油气藏地质与开发工程国家重点实验室基金"注聚合物凝胶地层温度场分布数值模拟"(项目编号PLN1412)

摘　　要：针对传统的乙烯基单体共聚物类降滤失剂在高温高盐油藏效果差的缺点,利用N,N-二甲基丙烯酰胺(DMAA)、二甲基二烯丙基氯化铵(DMDAAC)、N-乙烯基吡咯烷酮(NVP)和2-丙烯酰胺-2-甲基丙磺酸(AMPS)共聚反应得到了一种耐温耐盐钻井液降滤失剂WB-FLA-2,采用正交实验优化了WB-FLA-2的合成条件。借助红外光谱和热重分析表征了降滤失剂WB-FLA-2的分子结构和热稳定性,考察了降滤失剂WB-FLA-2的降滤失性能。结果表明,钻井液降滤失剂WB-FLA-2的最佳合成条件为:单体总质量分数20%,单体质量比DMAA:AMPS∶DMDAAC∶NVP=10∶2∶1.5∶1,引发剂用量0.5%,反应时间5 h,反应温度55℃。WB-FLA-2的热分解温度为255℃;在淡水基浆(5%膨润土+0.3%Na_2CO_3+淡水)中的最佳加量为2%。在淡水基浆中加入2%WB-FLA-2后,基浆老化前的API滤失量由28.4 mL下降至2.8 mL,150℃老化24 h后的API滤失量由78 mL下降至7.0 mL,在3.5 MPa×150℃条件下的高温高压滤失量也由130.8 mL下降至36.1 mL。组成为5%膨润土+0.3%Na_2CO_3+淡水+30%NaCl+2%WB-FLA-2的盐水泥浆经150℃老化24 h前后的API滤失量分别为12.4 mL和14.9 mL。降滤失剂WB-FLA-2表现出优良的降滤失性能和耐温耐盐性能,有望用于高温高盐地层。Aiming at the poor effect of traditional vinyl monomer copolymer filtrate reducer in high temperature and high salinity reservoirs, an anti-temperature and salt resistant filtrate reducer for drilling fluids WB-FLA-2 was prepared using the N, N-dimethyl acrylamide, dimethyl diallyl ammonium chloride, N-vinyl pyrrolidone and 2-acrylamide-2-methyl propane sulfonic acid as main raw materials, and the synthetic conditions were optimized by means of orthogonal experiment. The molecular structure and thermal stability of WB-FLA-2 were characterized by means of infrared spectroscopy and therm0gravimetric analysis, and the reducing filtration loss of WB-FLA-2 was also evaluated. The results showed that the synthetic condition was optimized as follows： total monomer mass fraction was 20%, monomer mass ratio （DMAA： AMPS： DMDAAC： NVP） was 10： 2： 1.5： 1, the initiator concentration was 0.5%, the reaction time was 5 h and the reaction temperature was 55 -C. The synthetic filtrate reducer for drilling fluids was quaternary copolymerization target product and the thermal decomposition temperature was 255-C. After adding 2% WB-FLA-2 into the fresh water base slurry, composed of 5% bentonite ＋0.3%Na2CO3＋fresh water, the API filtration loss （FLAP,） of the slurry decreased from 28.4 mL to 2.8 mL before aging, what＇ s more, FLAPI decreased from 78 mL to 7.0 mL after aged at the temperature of 150℃ for 24 h and HTHP filtration loss decreased from 130.8 mL to 36.1 mL at the temperature of 150℃ and under the high pressure of 3.5 MPa. The FLAPI of the brine slurry, composed of 5% bentonite ＋0.3%Na2CO3＋fresh water＋ 30%NAC1＋2% WB-FLA-2, before and after aged at the temperature of 150℃ for 24 h were 12.4 mL and 14.9 mL, respectively, which indicated that WB-FLA-2 had excellent reducing filtration loss, good thermal stability and salt resistance, and exhibited potential application in high temperature and high salinity reservoirs.

关 键 词：钻井液 降滤失剂 API滤失量 耐温性 耐盐性 

分 类 号：TE357[石油与天然气工程—油气田开发工程]