钻井液用梳型耐温抗盐增黏剂合成的逐级放大与性能

Preparation of Temperature and Saline-resistant Comb-type Polymer Viscosifier for Water-based Drilling Fluids：Step-by-step Scale-up Study

周忠亚 王小军 秦文斌 卢和平 代林 李俊 胡象辉 陈晋东 谢彬强

ZHOU Zhongya WANG Xiaojun QINWenbin LU Heping DAI Lin LI Jun HU Xianghui CHEN Jindong XIE Binqiang

选用丙烯酰胺（AM）、烯丙基聚氧乙烯醚（APEG）、丙烯酸二十二烷酯（DA）、2-丙烯酰胺基-2-甲基丙磺酸 （AMPS）为反应单体，以偶氮二异丁腈（AIBN）为引发剂、十二烷基硫酸钠（SDS）为表面活性剂，通过自由基胶束 聚合法，开展了梳型共聚物PMAS合成的逐级放大实验，研究了放大规模下PMAS的增黏性、抗温性、抗盐性和 抗剪切性，评价了放大后PMAS 在钻井液中的增黏性能。结果表明，采用3 级不同的聚合规模放大后制得的 PMAS存在一定的放大效应，但放大前后的PMAS始终具有较好的增黏、耐温抗盐和抗剪切能力；在190 ℃老化 16 h 后，加有质量分数为1%的PMAS的低盐钻井液和饱和盐水钻井液的表观黏度保留率分别为61.4%和60.0%， 放大后PMAS抗温耐盐性能明显优于国内商用增黏剂80A-51，具有良好的市场推广应用前景。

Step-by-step scale-up synthesis of comb-copolymer PMAS was carried out using acrylamide （AM）， allyl polyoxyethylene ether （APEG），docosyl acrylate （DA） and 2-acrylamido-2-methylpropanesulfonic acid （AMPS） as reaction monomers，azodiisobutyronitrile（AIBN）as initiator and sodium dodecyl sulfate（SDS）as surfactant via a free radical micellar polymerization，and the properties of viscosity increment，temperature resistance，salt resistance and shear resistance were evaluated，the viscosity increasing of PMAS in the drilling fluid before and after hot-rolling was evaluated. The results showed that the scale-up experimentation of PMAS exhibited slightly varying properties when prepared by three different polymerization scale， however，always maintained excellent viscosity increments，temperature，salt resistance and shear-tolerance. After aging at the temperature of 190 ℃ for 16 h，the apparent viscosity retention rates of low-salt and saturated brine drilling fluids with 1% PMAS were 61.4% and 60.0%，respectively. The temperature and salt resistance of PMAS at big polymerization scale was superior to that of the commercial viscosifier 80A-51，exhibiting a good application prospect.

10.19346/j.cnki.1000-4092.2023.04.004