耐高温油井水泥缓凝剂的合成与研究
发布时间：2018-11-12 07:47
【摘要】：固井是钻完井作业过程中不可缺少的一个重要环节,它主要包括以下两个步骤:下套管和注水泥。而水泥浆外加剂又在注水泥作业中起着至关重要的作用。随着油气井钻探深度的增加,井底的温度、压力不断升高,对固井用水泥浆外加剂的性能也提出了更高地要求。当前,国内使用的高温缓凝剂还普遍存在“分散性强”、“配伍性差”、“稠化实验易鼓包、包芯”等问题,这将给固井施工带来风险。本文针对耐高温缓凝剂所存在的上述问题,通过分子结构设计,以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、N-乙烯基吡咯烷酮(NVP)、丙烯酸(AA)和马来酸酐(MAH)为聚合单体,以自由基水溶液聚合为聚合方法,合成了一种四元共聚物P(AMPS/NVP/MAH/AA)型缓凝剂。通过设计一个四因素三水平的正交实验确定了该缓凝剂的最佳合成条件,即单体配比为AMPS/NVP/MAH/AA=7:0.75:1:1.25(质量比)、溶液pH值为6、反应温度为45℃、APS加量为1%(占单体总质量)。并将在最佳条件下合成的四元共聚物型缓凝剂命名为PANAM。采用IR和1H-NMR对缓凝剂PANAM的分子结构进行表征,结果表明AMPS、NVP、MAH和AA四种单体均成功参与了聚合反应,产物为目标产物;采用DSC对缓凝剂PANAM的耐温性能进行考察,结果表明该缓凝剂耐温性能良好,耐温可达365℃。对缓凝剂PANAM的应用性能进行评价,结果表明该缓凝剂具有优良的缓凝性能,较低的分散性能,优异的抗盐性能以及与其它外加剂具有良好的配伍性,同时该缓凝剂对水泥石的强度影响较小。以该缓凝剂为主剂的水泥浆体系综合性能良好,能够满足不同密度体系不同盐浓度条件下的固井需要,具有良好的应用前景。采用扫描电镜对缓凝剂PANAM的缓凝机理进行了探究,PANAM的缓凝作用存在吸附机理或晶核毒化机理,也有两种机理的协同作用。
[Abstract]:Cementing is an indispensable part of drilling and completion. It mainly includes two steps: casing down and cement injection. Cement slurry admixture plays an important role in cement injection. With the increase of drilling depth of oil and gas wells, the temperature and pressure of bottom hole are increasing, so the performance of cement slurry admixture for cementing is also required. At present, the domestic high temperature retarder also exists the problems of "strong dispersity", "poor compatibility", "thickening experiment is easy to drum, core" and so on, which will bring risks to cementing construction. In this paper, in view of the above problems existing in the high temperature retarder, through the molecular structure design, the 2-acrylamide 2-methylpropanesulfonic acid (AMPS),) N-vinylpyrrolidone (NVP),) was designed. A quaternary copolymer P (AMPS/NVP/MAH/AA) retarder was synthesized by free radical aqueous solution polymerization of acrylic acid (AA) and maleic anhydride (MAH). The optimum synthesis conditions of the retarder were determined by designing a four-factor and three-level orthogonal experiment. The monomer ratio was AMPS/NVP/MAH/AA=7:0.75:1:1.25 (mass ratio), the pH value of solution was 6, and the reaction temperature was 45 鈩，
本文编号：2326510
[Abstract]:Cementing is an indispensable part of drilling and completion. It mainly includes two steps: casing down and cement injection. Cement slurry admixture plays an important role in cement injection. With the increase of drilling depth of oil and gas wells, the temperature and pressure of bottom hole are increasing, so the performance of cement slurry admixture for cementing is also required. At present, the domestic high temperature retarder also exists the problems of "strong dispersity", "poor compatibility", "thickening experiment is easy to drum, core" and so on, which will bring risks to cementing construction. In this paper, in view of the above problems existing in the high temperature retarder, through the molecular structure design, the 2-acrylamide 2-methylpropanesulfonic acid (AMPS),) N-vinylpyrrolidone (NVP),) was designed. A quaternary copolymer P (AMPS/NVP/MAH/AA) retarder was synthesized by free radical aqueous solution polymerization of acrylic acid (AA) and maleic anhydride (MAH). The optimum synthesis conditions of the retarder were determined by designing a four-factor and three-level orthogonal experiment. The monomer ratio was AMPS/NVP/MAH/AA=7:0.75:1:1.25 (mass ratio), the pH value of solution was 6, and the reaction temperature was 45 鈩，
本文编号：2326510
本文链接：https://www.wllwen.com/kejilunwen/shiyounenyuanlunwen/2326510.html
