摘要
气体钻井是以空气或氮气作为循环相把钻屑和液滴带到地面的钻井技术,井筒出水未带出的液滴与钻屑混合形成的泥环,会导致岩屑和液体在井底聚集并降低渗透率,影响油气产量。因此,准确预测能携带岩屑和液体的最小注气量是目前亟待解决的问题。基于Boyun Guo的井底压力四相流模型和携带液体最小动能理论,并引入Qian Fang考虑的雷诺数和液滴球形度的滑脱系数理论,建立了求解气体钻井中携带液体的最小注气量方程,注气量计算结果与现场实测数据非常接近,并得出了相比仅携带固体钻屑,同时携带固体钻屑和液滴所需注气量更大的结论。
Taking both air and hydrogen as circulating phase, gas drilling is one technology which brings drilling cuttings and liquid to the surface. However, the cuttings and liquid, which can not be carried while water is produced from wellbore, may form a cement sheath to lead to an accumulation at bottomhole, resulted in a permeability decrease. So, it is very important to predict the volume flow rate of carried cuttings and liquid. In this study, based on the four-phase flow model of bottomhole pressure by Boyun Guo, the theory of minimum kinetic energy for carried liquid, the reynolds number considered by Qian Fang and the theory of slippage factor, we developed an equation on volume flow rate of carried liquid. The calculated results very approximate to in-situ data.
出处
《天然气技术》
2010年第5期35-37,共3页
NATURAL GAS TECHNOLOGY
基金
中国石化工程技术导向项目"四川地区低可钻性地层气体钻井提速试验"(编号:G0800-07-KK-121)的研究成果
关键词
气体钻井
压力
携带液体
滑脱系数
注气量
gas drilling, pressure, carried liquid, slippage factor, gas injection rate
