低黏度效应聚合物降滤失剂的合成与性能评价

Synthesis and Performance Evaluation of Polymer Filtrate Loss Reducer with Low Viscosity Effect

刘鹭 蒲晓林 戴毅 都伟超

LIU lu，PU Xiaolin，DAI Yi，DUWeichao

为降低降滤失剂对钻井液黏度的影响，采用丙烯酰胺、N-乙烯基吡咯烷酮、2-丙烯酰胺基-2-甲基丙磺酸、烯丙基聚乙二醇为主要单体，合成了聚合物降滤失剂GZ-1，用红外光谱对GZ-1 的结构进行了表征，研究了GZ-1 对钻井液流变性能和滤失性能的影响，通过环境扫描电镜分析了GZ-1 对钻井液滤饼微观形貌的影响。结果表明，合成的GZ-1 含有设计的官能团，黏均分子量适中（22.9 万），1.6% GZ-1 水溶液的黏度仅为7 mPa·s；随着GZ-1 浓度增加，聚合物钻井液的滤失量逐渐降低，钻井液的表观黏度（AV）和塑性黏度（PV）小幅增加，基浆在加入1.6%GZ-1 后的AV 和PV 增幅分别为1.7 和1.5 倍，180℃老化16 h 后的增幅分别为1.1 和2.7 倍；加入重晶石提高聚合物钻井液密度时未出现黏度激增现象；GZ-1 可使钻井液滤饼更为致密，有效抑制黏土颗粒的聚结作用。GZ-1 可抗180℃高温，增黏作用小于常用降滤失剂JT888和SY-3，对钻井液黏度的影响较小。图6 表4 参14

In order to reduce the effect of fluid loss reducer on the viscosity of drilling fluid，polymer fluid loss reducer GZ-1 was synthesized by four kinds of monomer，including acrylamide （AM），N-vinyl pyrrolidone （NVP），2-acrylamido-2-methyl propanesulfonic acid（AMPS）and allyl polyethylene glycol（APEG）. The molecular structure of GZ-1 was detected by infrared spectroscopy. The effect of GZ-1 on the rheological and filtration properties of drilling fluid was studied，and that on the microstructure of mud filter cake was analyzed by environmental scanning electron microscope. The results showed that the product accorded with the design. The viscosity-average molecular weight of GZ-1 was about 2.29×105，and the viscosity was only 7 mPa·s when the concentration of GZ-1 was 1.6% in aqueous solution. With increasing concentration of GZ-1，the filtration loss of polymer drilling fluid decreased，the apparent viscosity（AV）and plastic viscosity（PV）increased modestly. When 1.6% GZ-1 was added in base mud，the AV and PV increased by 1.7 and 1.5 times as original mud，while AV and PV increased by 1.1 and 2.7 times after aging 16 h at 180℃. Even after the addition of barite to raise density，the viscosity of drilling fluid did not appear sharp increase. GZ-1 could make the mud filter cake more compact and inhibit coalescence of clay particle. GZ-1 had good resistance of high temperature（180℃）and had little effect on the viscosity of drilling fluid. The viscosity increasing effect of GZ-1 was less than that of common fluid loss reducer JT888 and SY-3.

10.19346/j.cnki.1000-4092.2016.03.001