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

白秋月

BAI Qiuyue

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% Na2CO3+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% Na2CO3+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。图5表2参8

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 thermogravimetric 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℃. The synthetic filtrate reducer for drilling fluids was quaternary copolymerization target product and the thermal decomposition temperature was 255℃ . 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（FLAPI）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%NaCl+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.

10.19346./j.cnki.1000-4092.2017.01.001