耐温油井水泥缓凝剂的合成与性能研究

发布时间：2018-05-08 19:06

  本文选题：耐温缓凝剂 + 缓凝机理　； 参考：《西南石油大学》2017年硕士论文

【摘要】：随着油气勘探开发向深层油气藏的延伸,高温深井数量明显增多,井底温度随井深增加而增加。由于井底温度较高,深井固井水泥浆常存在稠化时间缩短、沉降稳定性变差、水泥浆柱顶部强度发展缓慢等问题,这不仅影响固井质量,还可能使注水泥失败而导致重大损失。本文基于油井水泥的水化机理和缓凝机理,通过分子结构设计,合成适用于深井,超深井的耐温缓凝剂,表征和评价其结构和性能,研究其缓凝机理。本文从耐温缓凝的角度进行分子结构设计,以对苯乙烯磺酸钠(SSS)为主单体,羧酸类单体为主要缓凝副单体,并引入新型具有耐温缓凝的功能单体,通过自由基水溶液聚合方法合成出两种耐温缓凝剂P(对苯乙烯磺酸钠/衣康酸/不饱和羟基酯)和P(对苯乙烯磺酸钠/马来酸/多元环酰胺烯),并以稠化时间为性能依据,通过控制变量法,正交试验优选合成条件,获得较佳条件下的合成产物,代号分别为PSIH和LNS-1。对两种共聚物缓凝剂进行了分子结构和耐热性能表征及应用性能评价。结合XPS,FTIR,1HNMR三种方法表征了两种聚合物的元素组成,分子结构,官能团组成,表明所有聚合单体参与了反应,成功合成PSIH和LNS-1两种耐温缓凝剂;TG结果表明两种聚合物均具有良好的耐温性能,并结合聚合物溶液微观形貌图进一步说明。综合应用性能说明两种共聚物缓凝剂的高温(120～180℃)缓凝效果优越,稠化时间与缓凝剂加量间的线性关系良好;PSIH的特点在于大温差性能优秀,同等加量下高温稠化时间长、低温下抗压强度发展迅速,适用于大温差固井;LNS-1的特点在于高温下沉降稳定性良好,可有效防止高温下水泥浆沉降现象,对提高高温深井固井质量有重要意义。通过TG,XRD和SEM三种手段对比了纯水泥浆和加入两种合成缓凝剂的水泥浆的水化产物组成、含量及微观形貌,对缓凝剂的缓凝机理进行了初探,共聚物缓凝剂主要通过基团吸附和螯合两种方式形成聚合物膜阻碍水泥水化进程,起到缓凝效果。
[Abstract]:With the extension of oil and gas exploration and development to deep reservoirs, the number of high temperature deep wells increases obviously, and the bottom hole temperature increases with the increase of well depth. Due to the high bottom hole temperature, deep well cementing slurry often has problems such as shortening thickening time, poor settling stability and slow development of strength at the top of cement slurry column, which not only affects cementing quality, but also may cause cement injection failure and lead to great loss. Based on the hydration mechanism and retarding mechanism of oil well cement, through the molecular structure design, the temperature retarder suitable for deep well and ultra deep well is synthesized, its structure and performance are characterized and evaluated, and its retarding mechanism is studied. In this paper, the molecular structure was designed from the point of view of temperature-resistant retarding. The main monomer was sodium styrene sulfonate (SSS), the carboxylic acid monomer was used as the main retarding sub-monomer, and a new functional monomer with temperature-resistant retarding was introduced. Two kinds of thermostable retarders (sodium p-styrene sulfonate / itaconic acid / unsaturated hydroxyl ester) and P (sodium p-styrene sulfonate / maleic acid / polycyclic amideolene) were synthesized by free radical aqueous solution polymerization. By controlling the variables and selecting the optimum synthetic conditions by orthogonal test, the synthetic products were obtained under better conditions, named PSIH and LNS-1, respectively. The molecular structure and heat resistance of two copolymer retarders were characterized and their application properties were evaluated. The elemental composition, molecular structure and functional group composition of the two polymers were characterized by means of XPS FTIR 1H NMR, indicating that all the polymeric monomers took part in the reaction. PSIH and LNS-1 were successfully synthesized. The results of TG showed that the two kinds of polymers had good temperature resistance, and the results were further illustrated by the micrograph of polymer solution. The comprehensive application properties show that the two copolymer retarders have superior retarding effect at high temperature (120 ~ 180 鈩，

本文编号：1862656