中国石油大学学报（自然科学版）2017，Vol.41Issue(5)：87-93,7.DOI:10.3969/j.issn.1673-5005.2017.05.010
煤层气井固井泡沫水泥浆密度变化规律及应用
Study and application of change law of foamed cement slurry density for coalbed methane
摘要
Abstract
Foamed cement slurry has been used in well completion in coalbed methane development due to its low density, high intensity and good anti-channeling ability. However, the density of the foamed cement slurry in borehole is instable and can be greatly affected by the well depth. In this study, laboratory experiments were carried out with the two foamed slurries of differ-ent densities (1. 10 g/cm3 and 1. 20 g/cm3), in order to investigate the density variation of chemical and nitrogen-filled foamed cement slurry at different pressures ( i. e. well depths) . The bubbles size in the cement stone was measured using the micro-structure SEM diagrams. A cement displacement model using foamed cement slurry in coalbed methane wells was established in consideration of the cement displacement process and rheological properties of the cement slurry at different depth and pressure. The application of the model in 11 wells was conducted. The results show that the variation of the foamed cement slurry density with temperature and pressure is in accordance with the Boltzmann function. The bubbles size in the cement stone reduces sharply firstly with the increase of pressure and then its variation becomes smaller at high pressures. The qualification rate of the cementing process based on the model developed in this study can be 100% and the merit factor is more than 96%.关键词
泡沫水泥浆/煤层气/固井/Boltzmann函数Key words
foamed cement slurry/coalbed methane/well cementing/Boltzmann function分类
能源科技引用本文复制引用
王楚峰,王瑞和,王方祥,王成文..煤层气井固井泡沫水泥浆密度变化规律及应用[J].中国石油大学学报（自然科学版）,2017,41(5):87-93,7.基金项目
国家科技重大专项(2011ZX05060,2016ZX05044) （2011ZX05060,2016ZX05044）
教育部创新团队发展计划项目(IRT_14R58) （IRT_14R58）
