AA/AM/AETMAC三元聚合物的合成及其钻井液性能研究

Synthesis of AA/AM/AETMAC polymer and performance of the polymeric drilling fluid

张睿 万涛 孙先长 刘欣 汤先银

ZHANG Rui WAN Tao SUN Xianchang LIU Xin TANG Xianyin

成都理工大学材料与化学化工学院，四川成都　610059 成都理工大学能源学院，四川成都　610059 中国石油长城钻探工程有限公司长城录井公司，辽宁盘锦　124010

Collage of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China College of Energy Resources, Chengdu University of Technology, Chengdu 610059, China

以丙烯酸（AA）、丙烯酰胺（AM）、丙烯酰氧乙基三甲基氯化铵（AETMAC）作为原料单体，过硫酸铵为引发剂，采用水溶液聚合合成了一种水溶性AA/AM/AETMAC共聚物，研究了温度、无机盐浓度对聚合物溶液比浓黏度的影响，对聚合物钻井液的耐温抗盐性能进行了测试，采用扫描电镜（SEM）表征了聚合物钻井液滤饼的微细结构。结果表明，AETMAC含量过高、过低均会增大聚合物钻井液的滤失量，当AETMAC含量为20%时，聚合物钻井液的滤失量达到最小值。随着盐浓度和温度的升高，聚合物钻井液的滤失量小幅增加，SEM表明聚合物滤饼表面具有大量不规则、致密、微米级的孔洞。

A type of water soluble polymer is synthesized by solution copolymerization of acrylic acid (AA), acrylamide (AM), and acryloyloxyethyl trimethyl ammonium chloride (AETMAC) with ammonium persulfate as the initiator. The impact of temperature and salinity on the reduced viscosity of the polymer solution is investigated. The temperature and salinity stabilities of the polymeric drilling fluids are tested. The filter cake morphology is characterized by Scanning Electron Microscope(SEM). The results indicate that the filter loss of the polymeric drilling fluids reaches minimum with 20% as the concentration of AETMAC, whereas it would be increased if the AETMAC concentration gets too low or too high. The filter loss of the polymeric drilling fluids would increase slightly with the increase of salinity or temperature. The result of SEM shows that the filter cake has many holes which are irregular, compact, and micron-sized.