钻井液与完井液2017，Vol.34Issue(4)：85-89,5.DOI:10.3969/j.issn.1001-5620.2017.04.016
复合加砂抗高温防衰退水泥浆体系
High Temperature Anti Strength Retrogression Cement Slurry with Compounded Silica Powder
摘要
Abstract
Conventional Class G cement with silica powder is not able to satisfy the need of extra high temperature well cementing because of serious retrogression of the high temperature strength of the set cement. The mechanisms of set cement (with 35% silica powder) strength retrogression at 145 – 180 ℃, and the effect of particle sizes, concentrations and compounding of silica powder on the development of the strength of set cement at 170 – 200 ℃ have been studied to resolve strength retrogression of set cement at elevated temperatures. A high temperature anti strength retrogression cement slurry has been developed. These studies showed that (1) at temperatures above 160 ℃, the strength of a set cement with 30% silica powder begins to decline after curing for 30 h, and the higher the temperature, the earlier the process of strength retrogression. (2) The ratio of 0.18 mm silica powder, 0.09 mm silica powder and liquid silica is determined to be 30:60:10 based on the effect of coarse and fine particle silica powders on the development of the strength of set cement. When the compounded silica is added at a concentration of 70%, strength retrogression of set cement at 200℃ can be inhibited. (3) a high temperature high density anti strength retrogression anti-channeling cement slurry with compounded silica powder has been developed with density between 2.08 g/cm3 and 2.41 g/cm3, and it can be used at high temperatures such as 170-200 ℃. Through these studies, the continual strength retrogression of set cement is inhibited, the long-term mechanical performance is improved, and the technology developed can be used in perfectly cementing HTHP gas wells.关键词
复合加砂/强度防衰退/抗高温/硅粉加量/硅粉粒度/液硅/高密度水泥浆Key words
Compounded silica powder addition/Anti strength retrogression/High temperature resistant/Dosage of silica powder/Particle size of silica powder/Liquid silica/High density cement slurry分类
能源科技引用本文复制引用
路飞飞,李斐,田娜娟,朱文豪..复合加砂抗高温防衰退水泥浆体系[J].钻井液与完井液,2017,34(4):85-89,5.基金项目
中石化科研项目"顺南高压气井安全钻井配套技术研究"(P14013)资助. （P14013）
