是常规钻井泥浆循环方式的重大变革。
It is a big change to conventional way of drilling mud circulation.
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;
在常规钻井条件下，负脉冲信号的传输速度比正脉冲信号约高出1 0 %。
Under regular drilling conditions, the velocity of negative mud pulse is higher than that of positive ones about 10 percent.
采用空气钻井技术提高钻井机械钻速非常有效，钻速是常规钻井机械的数倍。
Air drilling is one of the effective means to increase drilling ROP, able to reach an ROP several times that of a conventional drilling.
孤岛油田岩性极为疏松，用常规钻井取心的办法不能较好地分析和认识油层的油水分布规律。
Gudao oilfield has so loose a lithology that the distribution of oil and water can't be identified by means of the conventional coring method.
与常规钻井相比，室内模拟钻井试验条件下负压脉冲射流辅助钻井可以使钻速提高0.7-3.0倍。
The rate of penetration of the negative pulse jet assisted drilling can increase from 0.7 to 3.0 in in-house simulation drilling compared to conventional drilling.
为了解决常规钻井在上扣、卸扣时因停止泥浆循环带来的一系列井下问题，美国最早开发了连续循环钻井技术。
To solve the problem in the well caused by the stopping of drilling mud at the time of connection, the continuous circulation drilling technology was developed initially in U.
通过分析定向井使用常规钻具组合的局限性，提出在冀东油田定向钻井中引入导向钻具的必要性。
This paper gives the necessity of using steering drilling tool in directional well drilling in Jidong Oilfield through the analysis of the limits in using conventional BHA.
文章最后指出，在现有钻井泵的实际工况下，空气包的常规计算方法完全可以应用。
In the end, the paper points out that under the present working conditions of the drilling pumps, the conventional computing method of the air accumulator can be used as well.
PMCD和DGD均采用针对不同钻井目的的闭环系统，通常用于因技术或经济原因而导致常规方法不适用时的情形。
CBHP, PMCD and DGD all use the closed-loop system specifically for drilling purposes and usually only when conventional methods are not applicable for technical or economic reasons.
通过与常规煤层气试验井对比，分析了煤层气小井眼钻井的经济效益。
Through a comparison, the economic benefit in slim-hole drilling for coalbed gas has been analyzed.
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.
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.
由于侧钻井、水平井特殊井身结构限制，常规的小件落物打捞器打捞成功率低。
Because the limit of special casing program of sidetracking well and horizontal well, the fishing success ratio of conventional little junk fisher is low.
小井眼与常规井眼的钻井工艺有较大差异，提高小井眼钻井速度有很大的实际意义。
There are the bigger differences between slim hole drilling technology and routine borehole drilling technology. Improving of slim hole drilling speed is of an important actual significance.
小井眼与常规井眼的钻井工艺有较大差异，提高小井眼钻井速度有很大的实际意义。
There are the bigger differences between slim hole drilling technology and routine borehole drilling technology.
由于研究区内钻井很少穿过断层，运用常规方法研究该区断层侧向封闭性具有一定困难。
Although there have been many methods to study the capacity of lateral sealing , the evaluation on the lateral sealing of faults in the research region is very difficult.
套管开窗侧钻小井眼水平井钻井技术的特殊性及复杂性给传统常规录井带来了严峻的挑战。
The particularity and complexity of sidetracking horizontal wells through the opened casing hole has brought severe challenges to conventional mud logging.
桅架的重量较常规井架要大，因此海洋钻井中不常使用，因为海洋钻井时比陆地作业时更关注重量。
They suffer from being heavier than conventional derricks and consequently are not usually found in offshore environments, where weight is more of a concern than in land operations.
桅架的重量较常规井架要大，因此海洋钻井中不常使用，因为海洋钻井时比陆地作业时更关注重量。
They suffer from being heavier than conventional derricks and consequently are not usually found in offshore environments, where weight is more of a concern than in land operations.
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