巨厚盐膏层固井用过饱和氯化钾水泥浆  

Oversaturated Potassium Chloride Cement Slurry for Cementing Boreholes Penetrating Thick Salt and Gypsum Formations

作　　者：杨培龙 许明标 王雷 程爽 王晓亮 

机构地区：[1]中国海油伊拉克有限公司,北京100010 [2]非常规油气湖北省协同创新中心,武汉430100

出　　处：《钻井液与完井液》2016年第5期80-83,共4页Drilling Fluid & Completion Fluid

基　　金：国家科技重大专项课题"海洋深水油气田开发工程技术(二期)"子课题"深水钻井特殊环境水泥浆体系研究"(2011ZX05026-001-03)

摘　　要：为提高巨厚盐膏层固井质量,解决固井过程中的盐溶问题,提出利用过饱和氯化钾溶液(相当于38%盐浓度氯化钾溶液)配制水泥浆,通过优选抗盐降失水剂CG80S、增强防窜剂GS12L以及非渗透剂BX-80等材料,构建了一套过饱和氯化钾水泥浆体系。室内对过饱和氯化钾水泥浆体系的物理性能、抗污染性能以及界面胶结性能进行了评价研究。实验结果表明,过饱和氯化钾固井水泥浆体系稠化时间以及失水量可控;68℃、24 h养护抗压强度大于15 MPa,混入5%的石膏、芒硝或页岩岩屑均不会对水泥浆的性能产生较大的影响,界面胶结实验显示该水泥浆能够显著提高水泥浆与盐岩地层的胶结质量,能够保障巨厚盐膏层一、二界面的胶结质量。To improve the job quality of cementing the borehole penetrating thick salt and gypsum formations, an over-saturated potassium chloride solution（contains 38% KCl） was used in formulating a cement slurry, in an effort to avoid rock salt dissolution during well cementing. The over-saturated KCl cement slurry formulated was treated with a salt-resistant filter loss reducer CG80 S, an enhanced anti-channeling agent GS12 L, and a non-penetrating agent BX-80. Laboratory evaluation showed that the over-saturated KCl cement slurry had controllable thickening time and filter loss. The compressive strength of the set cement, after aging for 24 h at 68℃, was greater than 15 MPa. When contaminated by 5% gypsum, Glauber＇s salt or shale cuttings, the properties of the cement slurry did not change noticeably. Laboratory experiments also showed that the bond of the cement slurry and the salt formations improved remarkably, indicating that the quality of the bond between the cement sheath and the casing string, and the bond between the cement sheath and the formations can both be guaranteed.

关 键 词：巨厚盐膏层 固井 过饱和氯化钾 过饱和盐水水泥浆 

分 类 号：TE256[石油与天然气工程—油气井工程]