钻杆

It has to be tall because it is like a giant block and tackle, and we have to lower into the ground NEW CONCEPT ENGLISH-BOOK FOUR and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.

井架必须很高，因为它像一个巨型滑轮组。我们必须把很长的钻杆一节节地钻入地下，然后再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转，它的底部装有钻头。

It has to be tail because it is like a giant block and tackle, and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom

井架必须很高，因为它像一个巨型滑轮组。我们必须把很大的钻杆一节节地钻入地下，然后再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转，它的底部装有钻头。

It has to be tall because it is like a giant block and tackle ,and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are roated bu an engine at the top and are fitted with a cutting bit at the bottom.

井架必须很高，因为它像个巨型滑轮组。我们必须把很长的钻杆一节节地钻入地下，然后再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转，它的底部装有钻头。

And we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.

我们必须把很长的钻杆一节节地钻入地下，然后再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转，它的底部装有钻头。

Sunshine Jinsheng prospecting machinery parts factory was established in 2004, in Juxian County in Rizhao industrial roundwood, mainly the production of machinery parts of prospecting, drilling pipe series of products, all kinds of Taps, the mother cone series, including alloy free clamp, pliers, wrenches, Pad fork, plywood, hammer hanging Series, all kinds of joints, joint public and joint mother, coupling series, Kahuang, kava series, to Reply, Reply to Central series, with the rope diamond drilling coring drill pipe, drilling - Tube assembly, gripping Trojans, and other products, and processed in accordance with customer demand for a variety of accessories.

日照金盛探矿机械配件厂成立于2004年，位于日照莒县工业圆，主要生产各种探矿机械配件，产品有钻杆系列、各种丝锥、公母锥系列、含合金自由钳、钳子、扳手、垫叉、夹板、吊锤系列、各种接头、接头公、接头母、接箍系列、卡簧、卡瓦系列、提引器、提引环系列、金刚石钻进用绳索取心钻杆、钻杆内管总成、木马夹持器、等产品，并可根据客户需求加工制作各种配件。

It has to be tall because it is like a giant block tackle, we have to lower into the ground haul out of the ground great lengths of drill pipe which are rotated by an engine at the top are fitted with a cutting bit at the bottom.

井架必须 ssbbww。 c om 很高， 8 Tt t 8。 com 它像一个巨型滑轮组。 sSBbWw 必须 ssbbww。 c om 把很长的钻杆一节节地钻入地下， 8ttt8.com 再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转，它的底部装有钻头。

Utilize energy method to research crook problem of drilling rod under pressure and act on together, having studied the crooked influence to the drilling rod of torsion emphatically, the theory analyses found that Axial load, hole vertex angle and torque are important factors of influence drilling rod crook.

利用能量方法研究了压力和扭矩共同作用下钻杆的弯曲问题，着重研究了扭矩对钻杆弯曲的影响，理论分析发现，轴向载荷，钻孔顶角和扭矩是影响钻杆弯曲的重要因素。

Others, parts on Kelly bar shouldn't be changed or demounted at random; welding shouldn't be done on the part which did not weld formerly; maintenance should be guided by manufacturer, it is prohibited to weld the key side in principle, welding should be done on three keys at one time, indexing is ensured by grinding after welding, internal keys should be grinded of its full-length to ensure indexing.

其它，钻杆上的制件不要随意拆换或卸掉；不要在原来不焊接的部位自作主张焊接；维修钻杆要有钻杆生产厂家指导，原则上不允许对键侧进行焊补，焊补要三键同时进行，焊补后修磨保证分度，内键要通长焊补修磨，保证分度。

Our leading products are drill collars, HWDP, Kellys, casing, All sorts of friction welding drill pipe, geological drilling pipe, all kind of tool joints, lifting subs and non-excavating drilling tool and etc.

公司主导产品是钻铤、整体加重钻杆、方钻杆、石油套管、各种摩擦焊钻杆、地质类管材，配套有各种钻具接头、提升短接以及非开挖钻具等。

Through studying mechanism of drilling string failure in the action of interaction of cyclicstresses and corrosion, we find fracture source is accord with pitting corrosion inside surface ofdrilling string, crack from pitting corrosion lead to drilling string failure, the process of drillingstring failure is new drilling string → corrosion pit forming and crack initiation → corrosionfatigue crack propagation→piercement or fracture.

通过研究在钻柱交变应力和腐蚀的交互作用下的机理发现，腐蚀疲劳裂纹源与钻杆内壁蚀坑对应，蚀坑萌生裂纹造成钻柱失效，钻柱腐蚀疲劳破坏过程归结为：新钻杆—蚀坑形成及裂纹萌生—裂纹扩展—刺穿和断裂。

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。