His Majesty the Sultan and Yang Di-Pertuan Negara Brunei Darussalam in his titah during the UBD 25th Anniversary Celebration in 2011 announced the introduction of The Chancellor's Scholar UBD.
2011年，苏丹陛下和文莱达鲁萨兰国的Yang Di-PertuanNegara在UBD25周年庆典上宣布了学者 UBD 的引言。
Gas drilling fluid is often used in UBD in low pressure formation.
在低压储层进行欠平衡钻井时常选用气体型低密度流体。
The difference of well control between UBD and conventional drilling;
欠平衡钻井井控与常规钻井井控差异及施工原则；
UBD is an irreversible process and its success depends on the changeable and unchangeable factors.
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。
The study work of wellbore stability and capacity to carry rock cutting during liquid UBD and gas drilling is developed.
开展了液相欠平衡及气体钻井井壁稳定及井筒携岩能力研究。
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.
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。
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.
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。
UBD with CT can reduce the formation and pay zone damage, enhance the penetration rate, improve safe operation with high efficiency and drop drilling costs.
欠平衡连续油管钻井，可减少钻井过程中对地层和产层的损害，可提高机械钻速，安全高效率钻井，降低钻井成本。
UBD is a drilling technique that reduces the hydrostatic pressure of the drilling fluid, causing the pressure in the wellbore to be less than the formation pressure.
UBD是一项钻井技术，此技术可以减少钻井泥浆带来的液体压力，引起的井身的压力远小于架构产生的压力。
Comparing with conventional completion technology, UBD completion could make fluid loss decrease to less, and avoid reservoir damage and improve oil & gas well production.
欠平衡完井技术与传统的常规完井技术相比，可以使流体滤失降低到最小程度，并能最大限度地减少储层损害及改善油气井产能。
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.
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。
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