分析了岩溶地层水文水井施工中，泡沫实现平衡压力或欠平衡压力钻井的原理及影响泡沫钻井有效井眼压力的因素。
The principle of reaching balance drilling and under balanced drilling using foam mud in water well drilling in Karst formation was presented.
利用气体型流体进行欠平衡钻井，或钻易漏地层时，流体密度及井下液柱压力的确定十分重要。
When underbalanced drilling or drilling easy leaky zone by using aeration fluid, the determination of fluid density and downhole fluid column pressure is very important.
井底负压值控制是欠平衡钻井技术的基础，而井底负压值的大小与环空多相流的有关压力计算有关。
The under-balanced drilling technology is based on how to control the bottom negative pressure which is related to the pressure computation of multiphase flow in annulus .
计算结果表明，该套公式较为精确地模拟了欠平衡钻井过程中井眼压力分布的规律。
Calculation results show that they accurately reveal the distribution pattern of pressure in wellbore during under-balanced drilling operation.
常规过平衡钻井方式打开油气层时，井底压力高于地层压力，钻井流体会向地层渗滤甚至漏失。
In routine overbalanced drilling, the bottom hole pressure towers above the formation pressure so that the mud fluid will leak into the formation.
在钻井过程中，井筒泥浆柱压力和地层压力的不平衡使得泥浆滤液不断渗入地层。
During the drilling procedure, the mud filtrates continuously penetrate into the formation because of the unbalance between the mud column pressure in the borehole and formation pressure.
本文着重低压井进行井底压力研究，参考前人欠平衡钻井流体力学参数设计理论、方法，对不同的流体介质进行了分析和研究。
Refering to the theories and methods on drilling fluid mechanic parameter design, This paper focuses on study on the pressure of bottom-hole; and then analyzes and studies different fluids media.
在原有的试井理论基础上，推导出欠平衡钻井随钻试井数学模型，并结合现有的试井方法，提出欠平衡钻井随钻试井实用方法——修正压降试井法和修正压力恢复试井法。
Based on the original well testing theory, the theory of well testing while UBD and the corresponding practical well testing method are derived. The well testing method is applied to two wells.
在原有的试井理论基础上，推导出欠平衡钻井随钻试井数学模型，并结合现有的试井方法，提出欠平衡钻井随钻试井实用方法——修正压降试井法和修正压力恢复试井法。
Based on the original well testing theory, the theory of well testing while UBD and the corresponding practical well testing method are derived. The well testing method is applied to two wells.
应用推荐