A Comprehensive Method for the Optimization of Cement Slurry and to Avoid Air Channeling in High Temperature and High-Pressure Conditions  

作　　者：Yanjun Li Wandong Zhang Jiang Wu Yuhao Yang Chao Zhang Huanqiang Yang 

机构地区：[1]Zhanjiang Branch of CNOOC(China)Co.,Ltd.,Zhanjiang,524000,China [2]College of Petroleum Engineering,Yangtze University,Wuhan,430100,China

出　　处：《Fluid Dynamics & Materials Processing》2023年第5期1237-1248,共12页流体力学与材料加工（英文）

基　　金：funded by the CNOOC Scientific Research Project“Study of cementing key properties and its matching technology of LD-10 gas field”(Grant No.CCL2019ZJFN1227).

摘　　要：Air channeling in the annulus between the casing and the cement sheath and/or between the cement sheath and formation is the main factor affecting the safe operation of natural gas wells at high temperatures and pressures.Prevention of this problem requires,in general,excellent anti-channeling performances of the cement sheath.Three methods to predict such anti-channeling performances are proposed here,which use the weightless pressure of cement slurry,the permeability of cement stone and the volume expansion rate of cement sheath as input parameters.Guided by this approach,the anti-channeling performances of the cement slurry are evaluated by means of indoor experiments,and the cement slurry is optimized accordingly.The results show that the dangerous transition time of the cement slurry with optimized dosage of admixture is only 76 min,the permeability of cement stone is 0.005 md,the volume shrinkage at final setting is only 0.72%,and the anti-channeling performances are therefore maximized.The effective utilization of the optimized cement slurry in some representative wells(LD10–1-A1 and LD10–1-A2 in LD10–1 gas field)is also discussed.

关 键 词：High temperature and high pressure cement slurry anti-channeling weightlessness pressure PERMEABILITY volume shrinkage 

分 类 号：TB30[一般工业技术—材料科学与工程]