摘要
规律的水泥浆稠化时间是保证固井作业安全进行的前提,稠化时间异常会对固井施工带来严重的影响。波特兰水泥在100~120℃范围内,水泥水化会产生变化,水泥浆的稠化时间通常规律性较差,存在稠化反转或缓凝剂失效现象,给现场固井作业带来一定的安全隐患。研究了一种新型聚合物缓凝剂CCH120,并在室内对使用CCH120的抗温敏大温差水泥浆体系和现有的水泥浆体系进行对比。研究结果表明,100~120℃中温水泥浆敏感段,CCH120聚合物水泥浆随温度升高稠化时间逐渐缩短,不存在稠化反转现象,并从机理上进行了解释。该水泥浆体系具有抗温敏性、稠化时间规律性强,失水量低、养护强度高,顶部起强度快的特点。
Cement slurry with thickening time of regular pattern is the premise for safe cementing operation. Abnormal thickening time will bring about severe bad effect on well cementing. In temperature range of 100 - 120 ℃ changes in the hydrated Portland cement will take place. The thickening time of the cement slurry is of poor regularity, sometimes resulting in reversed thickening or the failure of cement retarder, bringing about hidden dangers to the safety of well cementing operation. A new polymeric cement retarder, CCH120, has been developed and a temperature sensitivity resistant cement slurry （for use in big temperature difference well cementing） treated with the CCH120 has been compared with the presently available cement slurries for their performance. It was found that in 100 - 120 ℃, in which cement slurries exhibit temperature sensitivity, the thickening time of the CCH120 treated cement slurry was gradually shortened as the temperature was increased, and no reversed thickening was observed. The mechanisms of this phenomenon are explained in this paper. This cement slurry has temperature sensitivity resistance, thickening time with strong regularity, low fuid loss, high compressive strength, and fast strengthening at the top of the cement slurry.
出处
《钻井液与完井液》
CAS
北大核心
2017年第3期85-88,共4页
Drilling Fluid & Completion Fluid
关键词
缓凝剂
固井
抗温敏
中温段
Temperature sensitivity resistant
Big temperature difference
Retarder
Well cementing
