ubd

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；

Applications and Development of UBD Techniques

欠平衡钻井技术及其应用与发展

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。

Application of pressure drop model of gas / liquid two-phase flow in UBD drilling

气液两相流压降模型在欠平衡钻井中的应用

Current Status of the Research on Drilling Fluids for UBD

欠平衡钻井液技术研究现状

The application of UBD technique in horizontal section of well Niu 102

牛102井欠平衡泡沫水平井钻井技术

So the Ansari Method is recommended to use in UBD design because of its higher prediction accuracy .

因此，建议在欠平衡钻井设计中应用预测精度较高的Ansari方法。

This paper introduced the problems which should be considered in UBD , the methods to design the drilling parameter and its application effects .

本文介绍了欠平衡压力钻井应考虑的问题、钻井参数设计方法以及该技术应用效果。

The main problems for wide application of UBD offshore are the platform space , HSE , organization and management model , etc.

目前欠平衡钻井技术在海上推广应用中存在的主要问题涉及平台甲板空间、安全环保、组织管理模式等方面。

UBD ( Under-balanced Drilling ) has been applied widely onshore to improve the development of oil and gas fields .

欠平衡钻井在国内外陆地油田已得到了广泛的推广和应用，可有效提高油气田开发效益。

This is unprecedented in China that UBD ( underbalanced drilling ) technique with foam was applied in horizontal well .

将欠平衡钻井、水平井钻井技术两种工艺相结合并且成功应用在牛102井。

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。

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。

The influence of the injected gas volume on the output performance of positive displacement motor ( PDM ) is obvious in the process of aerated UBD .

在充气欠平衡钻井过程中，气体的注入量对马达的输出特性影响较大。

This paper describes the concept of UDB , together with its advantages and disadvantages , and demonstrates the formation damage mechanism during UBD , e. g.

介绍了欠平衡钻井的概念以及优点和缺点，阐述了欠平衡钻井对地层的损害机理为由于缺少起保护作用的滤饼，临时的超平衡造成对地层的损害；

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。

Through the analysis of the effects of wellhead backpressure , gas rate and liquid rate on the bottomhole pressure , the method used to control the bottom hole pressure during UBD is determined .

通过分析井口回压、注气量以及注液量等欠平衡钻井参数发生变化对井底压力的影响，确定了欠平衡钻井井底压力控制方法。

With the research and application of the underbalanced drilling ( UBD ) technology , it is demanded to maintain downhole underbalanced conditions from drilling into the reservoir to completion .

随着欠平衡钻井技术的深入研究和推广应用，全过程欠平衡钻井技术已成为研究热点。

As one of the most important equipment to implement underbalanced drilling ( UBD ) technology , it is required that rotary blowout preventer ( RBOP ) should maintain high reliability whenever in use .

旋转防喷系统是实施欠平衡钻井的关键设备，其使用可靠性关系到欠平衡钻井作业的成败和施工人员的生命安全。

In 1998 , Under Balanced Drilling ( UBD ) technology was used in this area to evaluate the production potential in the volcanic formation of Yingcheng formation , aimed at improving production capacity and realizing a breakthrough in such formations .

因此，1998年大庆油田决定应用欠平衡钻井技术来评价火山岩储层产能潜力，突破该区产能关，实现产能升级。

The recent advance of offshore UBD technology includes the development of advanced down hole tools , modularized and minimized design of UBD equipment , emphasis on reservoir analysis and study , and integration of UBD equipment with offshore rig or barge .

海上欠平衡钻井最新进展包括先进的井下工具的开发、设备的模块化与小型化、对油藏分析与研究的高度重视以及工作船与欠平衡钻井设备的一体化。