摘要
大牛地气田气藏是一个典型的低压、低孔、低渗、低含气饱和度的致密性气藏,只有通过压裂改造才能产气。针对常规压裂液体系在连续油管连续多层施工时长期浸泡地层、施工周期长、对地层产生严重伤害的问题,开展了低伤害压裂液体系的优化配制分析,初步推荐出以3.0%D3F-AS05+0.3%EDTA+6%KCl+0.6%KOH为主体配方的低伤害压裂液体系,并对该配方的压裂液流变性及抗剪切性能、破胶性能及与地层水的配伍性、稳定性及杂质影响进行了评价,对常规压裂液和低伤害压裂液对不同气层的伤害进行了对比,结果表明低伤害压裂液更适合大牛地气田连续油管连续多层压裂施工的需要。
Gas reservoirs in Daniudi gasfield are always typical tight ones with low pressure, porosity, permeability and gas saturation. And only through fracturing can it produce gas. During continuous coiled tubing and multilayer operation, the conventional fracturing-fluid system soaks in formation for a long time and the operation cycle is long, resulting in serious formation damage. In this study, an optimizing preparation for fracturing-fluid system with low damage is implemented; a formula of low damage one, which is mainly composed of 3.0 % D3F - AS05 + 0.3 % EDTA + 6 % KCl + 0.6 % KOH, is also preliminarily recommended. The formula's properties, such as fracturing-fluid rheology and shearing resistance, gel breaking and compatibility with aquifer, stability and influence of impurities, are evaluated. The damage caused by both conventional fracturing fluid and a low-damage fracturing fluid to different gas layers is compared. Result shows that the latter is more suitable for continuous coiled tubing and multilayer fracturing operation in Daniudi gasfield.
出处
《天然气技术》
2010年第5期28-30,共3页
NATURAL GAS TECHNOLOGY
关键词
大牛地气田
连续分层压裂
压裂液体系
优化
破胶性能
Daniudi gasfield, continuous multilayer fracturing, fracturing-fluid system, optimize, gel breaking property
