耐200℃固井水泥用悬浮剂的制备与性能表征  

The Preparation and Performance Characterization of a Cement Suspending Agent Resistant to 200 ℃

作　　者：罗敏 黄盛[1,3] 何旭晟[4] 李早元 程小伟 LUO Min;HUANG Sheng;HE Xusheng;LI Zaoyuan;CHENG Xiaowei(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500;School of New Energy and Materials,Southwest Petroleum University,Chengdu,Sichuan 610500;College of Petroleum and Natural Gas Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500;Department of Exploration,Southwest Oil-Gas Field Company,PetroChina,Chengdu,Sichuan 610041)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [2]西南石油大学新能源与材料学院,成都610500 [3]西南石油大学石油与天然气工程学院,成都610500 [4]中国石油西南油气田分公司勘探事业部,成都610041

出　　处：《钻井液与完井液》2022年第4期472-480,共9页Drilling Fluid & Completion Fluid

基　　金：四川省区域创新合作项目“页岩气水平井用原位增韧水泥研究与应用”(2021YFQ0045)。

摘　　要：针对深井、超深井固井中,水泥浆在高温下液相黏滞力下降而发生固相沉降失稳甚至分层的问题,设计合成了一种耐200℃的高温悬浮剂GX,该剂是以丙烯酰胺(AM)、对苯乙烯磺酸钠(SSS)、N, N-二乙基丙烯酰胺(DEAA)为单体,过硫酸铵(APS)为引发剂,采用自由基溶液聚合法制得的三元共聚物。采用GPC、FTIR、1H-NMR和SEM对高温悬浮剂的分子量、结构和形貌进行了表征,结果表明,3种单体均参与聚合反应,成功合成了AM/SSS/DEAA三元共聚物。TG、FTIR和SEM分析表明,高温悬浮剂的耐热性能优异,最高可达318.6℃。高温沉降稳定性评价结果表明,高温悬浮剂的适用温度可达200℃,水泥浆中加入悬浮剂GX后,200℃下密度差小于0.02 g/cm^(3),能提高水泥浆的沉降稳定性,且高温悬浮剂的加入对水泥浆的流变性、稠化时间和水泥石的强度无负面影响。In deep and ultra-deep well cementing, the viscous force of the liquid phase of a cement slurry decreases at elevated temperatures, resulting in settling of solid phase and even lamination of the cement slurry. To solve these problems, a high temperature suspending agent GX was developed through radical solution polymerization with acrylamide(AM), sodium p-styrene sulphonate(SSS), N,N-diethylacrylamide(DEAA) as the monomers and ammonium persulphate(APS) as the initiator. GX is a terpolymer resistant to 200 ℃. Characterization of the molecular weight, molecular structure and morphology of GX with GPC,FTIR, 1H-NMR and SEM have shown that the three monomers all take part in the polymerization reaction to produce the AM/SSS/DEAA terpolymer. TG, FTIR and SEM analyses have shown that the high temperature suspending agent GX has excellent thermal stability, it is resistant to 318.6 ℃. High temperature settling stability evaluation has shown that GX functions normally at temperatures as high as 200 ℃, a cement slurry treated with GX has density difference of less than 0.02 g/cm^(3) at 200 ℃. GX can be used to improve the settling stability of cement slurries, and it has no negative effects on the rheology, thickening time of the cement slurry, and on the strengths of the set cement.

关 键 词：高温悬浮剂 沉降稳定性 自由基溶液聚合法 三元共聚物 油井水泥 

分 类 号：TE256.6[石油与天然气工程—油气井工程]