丙烯酰胺基交联聚合物微球的制备及其对钻井液性能的影响

Preparation of Acrylamide-based Cross-linked Polymer Microspheres and the Effects on Drilling Fluid Properties

吴鹏伟 杜文浩 邹 琴 高 俊 张 熙

WU Pengwei，DU Wenhao，ZOU Qin，GAO Jun，ZHANG Xi

为揭示水分散聚合方法制备的丙烯酰胺基交联聚合物微球的结构特征及其对钻井液性能的影响规律，以硫酸铵水溶液为反应介质，丙烯酰胺（AM）、丙烯酸（AA）、甲基丙酰氧乙基三甲基氯化铵（DMC）为共聚单体，2，2-偶氮二（2-甲基丙基咪）二盐酸盐为引发剂，N，N'-亚甲基双丙烯酰胺复配物为交联剂制备了丙烯酰胺基交联聚合物微球。采用红外光谱、粒度分析等方法表征了交联聚合物微球的结构，研究了丙烯酰胺基交联聚合物微球对钻井液性能的影响。结果表明，交联聚合物微球的合成工艺条件对产物的降滤失性影响较小，但对产物在钻井液中的增黏作用影响显著。随 AM和交联剂加量增加，聚合物微球对钻井液的增黏作用增强；存在对钻井液增黏作用最小的引发剂加量和 AA与 DMC摩尔比。采用水分散聚合方法可制备出平均粒径 8.04 μm（粒径范围2.43～ 53.72 μm）的丙烯酰胺基交联聚合物微球。该交联聚合物微球对钻井液具有显著的降滤失作用和一定的增黏作用，耐温性能优良，150℃高温老化不会降低交联聚合物微球的降滤失作用，但可降低对钻井液的增黏作用，减小其对钻井液流变性的影响。图 1表 6参 18

In order to reveal the structural characteristics of acrylamide-based cross-linked polymer microspheres prepared by water dispersion polymerization method and their influence on the performance of drilling fluid，the acrylamide-based cross-linked polymer microspheres were prepared in an ammonium sulfate aqueous solution medium，using acrylamide（AM），acrylic acid （AA）and methyl propionyloxyethyltrimethylammonium chloride（DMC）as monomers，2，2-azobis（2-methylpropylimidazolium）dihydrochloride as initiator，and N，N'-methylenebisacrylamide complex as crosslinker. The structure of polymer microspheres was characterized by infrared spectroscopy and particle size analysis. The effect of cross-linked polymer microspheres on the performance of drilling fluid was investigated. The results showed that the synthesis conditions of cross-linked polymer microspheres had little effect on the filtration reduction of product，but had a significant effect on the viscosity-enhancing effect of polymer microspheres in drilling fluid. With the increase dosage of AM and crosslinker，the viscosity-enhancing effect of polymer microspheres on drilling fluid was enhanced. There was an additive amount of initiator and a molar ratio of AA to DMC that had the least effect on the viscosity increase of drilling fluid. The acrylamide-based cross-linked polymer microspheres having an average particle diameter of 8.04 μm（particle size range of 2.43—53.72 μm）were prepared by water dispersion polymerization method.The cross-linked polymer microspheres with excellent temperature-resistant performance significantly reduced the filtration of drilling fluid and slightly enhanced viscosity. After being aged at 150℃ ，the filtration reduction of polymer microspheres was influenced a little，but the viscosity-enhancing effect of polymer microspheres to drilling fluid was weakened and their influence on the rheology of drilling fluid was reduced.