摘要
为满足深井固井对水泥缓凝剂的特殊要求,研制出了一种高温耐盐缓凝剂SDH-2.该缓凝剂由碱、醛、亚磷酸制备,具有工艺简单、成本低的特点.介绍了SDH-2的制备条件,考察了反应物配比和催化剂加量对产品性能的影响,并在室内评价了SDH-2的缓凝性能、耐温抗盐性能、配伍性能以及对水泥石抗压强度的影响.结果表明:SDH-2在40～170 ℃的范围内具有优良的缓凝效果,缓凝时间可调性好,稠化曲线理想,抗盐性良好,与降失水剂、减阻剂有良好的相容性,对油井水泥选择性小,水泥石抗压强度高.SDH-2在现场应用了6口井,结果表明:该缓凝剂解决了深井固井中水泥浆稠化性能不稳定,稠化时间难以控制的问题,水泥浆具有良好的流动性能,满足不同井眼条件下固井对水泥浆流动性能的要求;同时水泥浆抗压强度发展迅速,高温条件下水泥石性能稳定,符合深井固井的要求.
To meet the special requirements of cement retarder for deep cementing,a high temperature and salt tolerant cement retarder was developed.In this paper,the preparation of SDH-2 was introduced,and evaluation results of retardation,thermal stability,salt tolerance,compatibility with other additives and compressive strength of cement stone were also presented.Experimental data showed that SDH-2 exhibits good retarding ability to oil well cement slurries at 40 to 204 ℃,and the thickening time is adjustable and the thickening curve is in good shape;It works well with the presence of other salts;it is compatible with dispersants,filtrate loss controllers and the set slurry has high compressive strength.SDH-2 has been applied in 6 wells.Field using verified that it could help solve problems onsite such as unstable cement slurry properties and uncontrollable thickening time in deep wells.The slurry with SDH-2 in has good rheological property,satisfying rheological requirements of cement slurry for different down hole conditions.At the same time compressive strength develops rapidly,and the stone is stable at high temperature.
出处
《钻井液与完井液》
CAS
北大核心
2005年第5期24-27,共4页
Drilling Fluid & Completion Fluid
