但是，欠平衡钻井技术并非适用于所有的油气藏。
But, underbalanced drilling technology is not suitable for every reservoir.
欠平衡钻井应在地层情况等条件具备的井中进行。
Underbalanced drilling shall be conducted in proper Wells where formation conditions are known and suitable.
欠平衡钻井井控与常规钻井井控差异及施工原则；
The difference of well control between UBD and conventional drilling;
在低压储层进行欠平衡钻井时常选用气体型低密度流体。
Gas drilling fluid is often used in UBD in low pressure formation.
以优化欠平衡钻井作业为依据，提出了油气藏的筛选步骤。
Finally, it provides the screening process of reservoirs based on the optimizing underbalanced drilling technology.
利用泡沫流体进行欠平衡钻井，是一种较安全的钻井技术。
同时，应开展欠平衡钻井技术在煤层气开发中的应用研究工作。
The application of the underbalanced drilling technique in the development of the coal-bed gas should be researched at the same time.
本文建立的模型可以用于泡沫欠平衡钻井修井理论设计、施工参数优化。
The models developed in this paper can be used for the theoretical design of foam underbalanced drilling and workover and for the optimization of the operation parameters.
国内欠平衡钻井普遍实施，要用到的旋转防喷器是关键设备，技术含量高。
While underbalance drilling spreads greatly, rotating blowout preventer, as a kind of high technical product, is the crucial equipment to control well pressure.
试验结果表明该阀已达到设计要求，能够满足全过程欠平衡钻井的工艺要求。
The shop tests indicated that all the performance parameters of the valve can meet the design requirements and satisfy the need of whole-course underbalanced drilling.
由于其独特的优势，泡沫流体钻井已成为欠平衡钻井系列技术中的重要组成部分。
With the particular advantages foam fluid drilling has been the important proportion of underbalanced drilling.
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.
欠平衡钻井技术可以降低地层损害、提高机械钻速，所以在世界范围内被逐渐采用。
Underbalanced drilling technology can increase ROP and decrease formation damage, so it is increasingly used worldwide.
着重论述了水平井段欠平衡钻井负压差值的选择依据，以及泡沫流体各参数的设计方法。
How to select the proper different pressure of UBD in the horizontal part of the well was discussed in this paper, as well the design of foam parameter.
欠平衡钻井是不可逆的一次性过程，欠平衡钻井成败取决于多个可控因素与不可控因素。
UBD is an irreversible process and its success depends on the changeable and unchangeable factors.
经模拟试验和现场应用情况表明，研制的液气分离器脱气效果良好，能满足欠平衡钻井需要。
The simulation test and field use show that, the new separator has good performance in separating gas from drilling fluid, it can meet the demand of underbalanced drilling.
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.
研究和现场试验表明，采用欠平衡钻井技术，尤其是气体钻井技术是钻井提速增效的有效途径。
It is showed by field and experimental that the underbanlanced drilling(UBD) and special gas drilling is the effective way to improve ROP and efficiency.
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 .
基于弹性力学理论及岩石摩尔-库仑强度破坏准则，提出了欠平衡钻井条件下井径扩大率的预测方法。
Based on the theory of elasticity and molar-Coulomb strength failure criterion, we proposed the prediction method for hole enlargement ratio in the condition of underbalanced drilling.
目前广泛推广使用的欠平衡钻井工艺的施工方法已对录井作业产生了直接或间接的、不同程度的影响。
Wide application of underbalanced drilling techniques has directly or indirectly influenced logging operation to some extent.
王平1井是江汉油田的第一口中曲率水平井，储层岩性为盐间非砂岩层，水平井段采用欠平衡钻井技术。
Well WP-1 is the first medium radius horizontal well drilled in Jianghan oilfield, and its horizontal interval is drilled using under-balanced technology.
空气钻井技术是以空气作为循环介质的欠平衡钻井技术，其钻头的破岩形式与常规泥浆钻井有很大的区别。
Air drilling is a kind of under-balanced drilling technology with air, whose rock breaking form is different from conventional mud drilling.
欠平衡钻井和欠平衡测井技术对于直接发现和保护油气层、提高单井产能和勘探开发成功率具有非常重要的意义。
Under-balanced drilling and under-balanced logging are very important techniques for directly identifying and protecting hydrocarbon reservoirs and enhancing productivity.
空气钻井是目前钻速最快、最经济的欠平衡钻井作业方式之一，是低压低渗漏特别是恶性井漏钻井最实用的技术。
Air drilling is one of the fastest and cheapest drilling methods up to now. It is the most practical technology to penetrate the low - pressure and low -permeability reservoirs and leak - off zones.
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.
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.
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