查询词典 drilling stem

In order to safe and fast drilling in creeping salt bed in S84 Well, some technological practices were adopted, such as unsaturated salt water drilling fluid system, measurement technique of formation creeping rate and homoion effect technique, which can solve some problems during drilling operations in creeping salt beds.

S8 4井在钻进过程中遇到塑性蠕动非常严重的盐膏层，为安全快速钻进，采取了应用欠饱和盐水钻井液体系、地层蠕动速率测定技术、同离子效应技术等工艺措施，较好地解决了该井盐膏层钻井存在的一些问题，为日后钻穿盐膏层提供了借

The company has strong product development strength, internal combustion series of rock-drilling machine, electric drilling machine, pneumatic rock drill, electric rock drilling, rice and wheat combine harvesters and so is my company's independent development.

公司有较强的产品研发实力，系列内燃凿岩机、电动凿岩机、气动凿岩机、电动岩石钻、稻麦联合收割机等均是我公司自主开发的。

Aiming at the frequent occurrence of drill-string fracture during gas drilling in the Puguang gas field, this paper, based on the statistical analysis of accidents on fields, makes in-depth investigation into the origins of drill-string accidents in aspects of peculiar drilling medium, different rock-breaking methods, and the vibration of drill string during the drilling process. Through macro, micro and material analysis of the fracture surface of drill string, the law of drill-string failure due to fracture is discovered and the fatigue fracture is found out to be the main type of drill-string fracture.

针对普光气田气体钻井过程中存在的钻具断裂频繁的问题，在对现场事故统计分析的基础上，从特殊的钻井介质、不同的破岩方式以及钻井过程中钻柱共振等方面定性分析了钻具断裂的原因；通过对钻具断口宏观、微观及材质分析，找到了钻具断裂失效的规律和主要形式－疲劳断裂。

Currently, in order to control gas and enhance CMM recovery, various methods are adopted in Jixi Coal Mining Area such as upper roadway CMM drainage of low-permeability coal seams, upper near-horizontal hole drilling, coal seam plus-angle hole drilling, and roof large-diameter horizontal hole drilling, with satisfactory drainage results.

目前矿区为治理瓦斯，加大煤层气抽采，采用低透气性煤层的高位巷道抽采、高位钻场近水平钻孔、煤层钻场仰角钻孔抽采、顶板大直径水平钻孔等抽采方法，取得了良好的抽采效果。

With the electromagnetism theory and the characteristic of the well-drilling equipment,the paper brings forward the engineering technique of using drill stem as antenna in the telemeteing system of well-drilling.

此类系统大多是利用电磁波来传递信息的测试系统。发射电磁波的天线的形式和尺寸的选择，很大程度上决定了该系统的技术优势和整体成本。

Drilling stem is an important part in drilling.

钻柱是钻井过程中的重要工具。

AJ type safety joint is a specialized joint consisting of two parts. The specialized joint takes protective effect for drilling stem in drilling, repairing and test oil engineering, etc.

AJ型安全接头是一种由两件组装起来的专用接头，是钻井，修井，试油等工程中对钻柱起保护作用的一种专用工具。

This method displays the whole process of the contact between drill stem and well wall, and gives contact points and contact forces. It provides a reliable and practical aidlifetime of the drill stem. The method presented in this paper may also be adapand extended reach well drilling.

为实钻时，防止钻柱磨损和对钻柱寿命的预测提供了依据，对钻柱的结构设计以及钻柱力学的研究具有一定指导意义，本方法适用性强也可应用于定向井、大位移井等同类问题的研究。

AIM:Studies on totipotential stem cells using primordial germ cells have the same application prospect as embryonic stem cells, especially for the animals difficult to isolate embryonic stem cells from blastula.

目的：应用原始生殖细胞进行全能干细胞的研究具有与胚胎干细胞同样广阔的前景，尤其适合于难以从囊胚内细胞团中分离培养胚胎干细胞的动物。

With the development of the tumor stem cell theory, targeted therapy on stem cells has become a new theory. How to separate and purify tumor stem cells has also become an important part of the research.

随着肿瘤干细胞学说的日趋成熟，针对干细胞的靶向治疗已成为新的理论，分离与纯化肿瘤干细胞是研究的重要组成部分。

I can do simple painting, carpentry and plumbing.

我能做简单的油漆、木工和修水管等工作。

The motivations, notations and outline of this work are also given in this chapter.

从这个意义上讲，这些时滞是无害的。然后用实例说明这三个定理的应用和互不包含性。