钻井

Percussive drilling ; rotary drilling ; penetration rate ; wave theory ; rock mechanics ; mathematical model ; force analysis

冲击钻井；旋转钻井；机械钻速；波动理论；岩石力学；数学模型；受力分析

In this paper the model of the thermal conduction between the wellhole and the formation was developed after considering the effects of the heat conduction and the heat convection on the basis of the law of conservation of energy, then the temperature distribution varied with the depth of the interior and the exterior of the drilling pipe was calculated during the gas drilling, which provides the accurate basic data for exact calculation of the temperature distribution of the wellhole.

本文根据能量守恒定律，考虑热传导、热对流的影响，建立了井筒和地层之间的热传递模型，计算了气体钻井过程中管柱内外沿井深的温度分布，为气体钻井计算井筒压力分布提供了准确的基础数据。

In floating drilling, such an emergency can occur when the wellsite has to be abandonedbecause of threatening weather, On land, shearing may be the last resort in case of a blowout through the drillpipe.

在浮式钻井中，当钻井工地由于恶劣天气被迫放弃时可能发生此类应急情况。在陆地上，在钻杆爆裂的情况下，切变可能是最后的招数了

The penetration rate was increased by using the laddering large hole casing design and optimized drill bits.

胜科1井是中国石化在胜利油田部署的一口重点科学探索井，完钻井深7 026 m，φ339.7 mm技术套管下深2 922.78 m，φ311.1 mm大井眼井段深达4 155 m，采用了阶梯式大井眼结构设计与钻头优选技术，提高了大井眼钻井速度。

Based on the quality investigation of the on- site engineering accidents in well logging and drilling in Xianhe Production Plant of Shengli oil field in recent years, the analysis focuses on the main causes of the accidents, thus a series of preventive mea- sures are putting forth.

通过对胜利油田现河采油厂近年来侧钻井现场工程事故的质量调查，重点分析了造成侧钻井工程事故的主要原因，并提出了一系列能给油田带来良好的修井效益的预防治理措施。

The differential equation can be used to simulate the working state of the tensional section in the rotary slender drillstring in vertical well section.

利用该计算模型可以模拟石油钻井工程中旋转细长钻柱受拉段的工作状态，所得结果对钻井作业具有一定的指导意义。

On the basis of the formation pressure,rational underbalance pressure and drilling fluid density are determined.

以最优的钻井成本，能实现最容易和最安全的钻井施工来衡量欠压值选得是否合理。

A dynamic formation evaluation may be also realized through the analysis of borehole gas unsteady flow, so that the analysis is an important component part of well test while drilling theory of underbalance drilling.

通过对井内气体不稳定流动的分析，还可以实现钻井过程中的动态地层评价，因此，井内气体不稳定流动也是欠平衡钻井随钻试井理论的重要组成部分。

Nitrogen drilling ; deep well ; drilling technology ; underbalance

氮气钻井；深井；欠平衡钻井

The characteristics of the salt formation in Tarim Basin is deep, high temperature and high pressure, easy to result in the undergauge, collapse, drill bit or pipe sticking.

针对塔里木盆地石炭系盐层埋藏深，温度高，地层压力大，极易发生&缩径、坍塌&，造成卡钻，同时由于盐岩层的塑性蠕动，形成不规则井眼，甚至造成套管挤毁变形事故，井身质量难以控制，固井质量难以保证等问题，通过对同类型已钻井进行总结分析，提出了一系列钻井技术措施，并在T726井严格实施。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。