分散聚合法制备固井降失水剂及性能研究  

Preparation and Performance Evaluation of Well cementing Fluid Loss Additive by Dispersion Polymerization Method

作　　者：邹亦玮 王义昕 朱思佳 宋维凯[1,2] 罗宇维 汤雨霖[1,2] ZOU Yiwei;WANG Yixin;ZHU Sijia;SONG Weikai;LUO Yuwei;TANG Yulin(China Oilfield Services Limited,Langfang,Hebei 065201;CNOOC Key Laboratory of Offshore Drilling Fluids and Cementing,Langfang,Hebei 065201)

机构地区：[1]中海油田服务股份有限公司,河北廊坊065201 [2]中国海洋石油集团有限公司海上钻完井液与固井重点实验室,河北廊坊065201

出　　处：《钻井液与完井液》2024年第6期784-791,共8页Drilling Fluid & Completion Fluid

基　　金：中海油服揭榜挂帅项目“海水基固井关键外加剂的开发与机理研究”(YHB23YF004)部分研究成果。

摘　　要：针对水溶液聚合以及反相乳液聚合的弊端,首次报道了一种通过分散聚合制备固井降失水剂C-FL72L的方法。其中,以丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、富马酸(FA)、N,N-二甲基丙烯酰胺(DMA)为聚合单体,季戊四醇三烯丙基醚(APE)为交联剂,聚乙烯吡咯烷酮(PVP-K30)为稳定剂,固含量为33%。对分散聚合的反应动力学进行了考察,反应4 h转化率可达98.9%。通过红外光谱测试、热重分析、高效液相色谱分析、凝胶渗透色谱分析等表征手段,表明所有单体充分且完全聚合,降失水剂耐温超过300℃,分子量可达77.2万。对样品在水泥浆中的应用性能进行了评价,在210℃下,可将失水控制在50 mL以内,水泥浆流变性能、稠化性能、抗压强度等水泥浆综合工程性能良好。并对使用新合成方法制备的降失水剂的作用机理进行了探讨。降失水剂C-FL72L在高密度、低密度、树脂、胶乳、盐水等功能水泥浆体系中综合应用性能优异,有着广阔的应用前景。In view of the disadvantages of aqueous solution polymerization and inverse emulsion polymerization,herein we report for the first time preparation of a cementing fluid loss additive C-FL72L through dispersion polymerization,in which acrylamide(AM),2-acrylamido-2-methylpropanesulfonic acid(AMPS),fumaric acid(FA),N,N-dimethylacrylamide(DMA)are used as monomers,pentaerythritoltriallyl ether is used as crosslinker,and polyvinylpyrrolidone(PVP-K30)is used as stabilizer.The reaction kinetics of dispersed polymerization were investigated,and the conversion rate reached 98.9%after 4 hours of reaction.By means of infrared spectrum test,thermogravimetric analysis,high-performance liquid chromatography,gel permeation chromatography and other characterization methods,it is shown that all monomers are fully and completely polymerized,the temperature resistance of the fluid loss additive exceeds 300℃,and the molecular weight can reach 772,000.In the performance evaluation of cement slurry,fluid loss can be controlled within 40 mL at 150℃,and the engineering properties of cement slurry,such as rheological properties,thickening properties,and compressive strength,are excellent.The mechanism of the fluid loss additive is also discussed.The fluid loss additive C-FL72L has excellent application performance in functional cement slurry systems such as high-density,low-density,resin,latex,saline water,and has broad application prospects.

关 键 词：固井 油井水泥 降失水剂 分散聚合 控失水 高温高压 

分 类 号：TE256[石油与天然气工程—油气井工程]