摘要
针对水溶性聚合物在水泥浆中耐高温性能的局限性,笔者突破传统水溶性共聚物的研究思路,设计了无机非金属材料-有机聚合物高温缓凝剂ZRT-1,通过正交实验法及单因素法确定了ZRT-1的最佳合成工艺,AMPS∶IA∶AA的物质的量比为7.0∶1.5∶1.5,偶联剂加量为0.5%,无机材料加量为1%,引发剂加量为1.5%,单体质量分数为30%,pH值为4,反应温度为65℃,反应时间为8 h;分别采用红外光谱(FT-IR),热重分析(DSC/DTG)、凝胶渗透色谱(GPC)等对ZRT-1进行了表征。结果显示,ZRT-1具有预期结构和官能团,热稳定性好,重均分子量为10091,数均分子量为2020,分子量分布为4.99;对ZRT-1的性能评价结果表明,水泥浆稠化时间随ZRT-1加量的增加呈线性增加,随着温度的升高也呈线性降低,具有加量和温度可调性;ZRT-1加量为0.4%~1.5%时,水泥浆在114~230℃、54~90 MPa时的稠化时间在200~400 min之间可调,稠化曲线平稳,过渡时间短且呈直角稠化。
A high temperature retarder ZRT-1 was synthesized with a nonmetallic material and an organic polymer. The development of ZRT-1 is to overcome the high temperature stability limitation of water soluble polymers used in cement slurries. The optimum synthesis process was determined using orthogonal test and single factor method;the molar ratio of the monomers was: AMPS∶IA∶AA = 7.0∶1.5∶1.5. The concentrations of the coupling agent, the inorganic material and the initiator were 0.5%, 1% and 1.5%. The mass fraction of the monomers was 30%. The pH of the reaction was 4, the reaction temperature 65 ℃, and the reaction time 8 h. Characterization of the synthetic product by FT-IR, DSC/DTG and GPC showed that ZRT-1 had the molecular structure and functional groups required. The molecular structure and functional groups render ZRT-1 good thermal stability. ZRT-1 had a weight average molecular weight(Mw) of 10091, a number average molecular weight(Mn) of 2020, and a molecular weight distribution of 4.99. Evaluation of ZRT-1 showed that the thickening time of a cement slurry linearly increased the concentration of ZRT-1, and linearly decreased with temperature. A cement slurry treated with 0.4%-1.5% ZRT-1 had a thickening time between 200 min and 400 min at 114-230 ℃/54-90 MPa, and the thickening curve changed smoothly. The cement slurry also showed short transition time and rightangled thickening curve.
作者
李晓岚
郑志军
郭鹏
LI Xiaolan;ZHENG Zhijun;GUO Peng(Sinopec Zhongyuan Petroleum Engineering Co.,Ltd.Research Institute of Drilling Engineering Technology,Puyang,Henan 457001)
出处
《钻井液与完井液》
CAS
北大核心
2020年第1期93-96,共4页
Drilling Fluid & Completion Fluid
基金
中石化石油工程技术服务有限公司项目“高温油井水泥降失水剂ZFA-1和缓凝剂ZRT-1的研制”(SG15-02K)。
关键词
油井水泥
缓凝剂
水溶性聚合物
无机-有机聚合物
偶联共聚
Oil well cement
Retarder
Wa ter soluble polymer
Inorganic-Organic polymer
Coupling copolymerization
