a series of tube (joined by screwed collars) that connects a drilling platform to the drilling bit; rotates the bit and supplies drilling mud

the valve at the bottom of auger can prevent drilling bits entering hollow pipe during operation. when drilling pipe is taken out and concrete grout is injected, the valve will be opened.

螺旋鉆头底部阀门防止鉆进过程中鉆屑进入到空心的混凝土管中，当鉆桿提出同时混凝土浆注入时，鉆桿底部的阀门将被打开。

trace design is the key of trenchless horizontal directional drilling pipe laying engineering, the paper makes a deep research on the trace optimization design with dynamic programming theory.

轨迹设计是非开挖水平定向鉆进管线铺设施工的关键。

construction technology and project application studying of no-dig horizontal directional drilling pipe paving;

对非开挖工程中水平定向鉆进轨迹最优化设计进行了深入研究。

in light of the commonly seen downhole breakdown of drilling pipe sticking in the drilling process, the new-type fully hydraulic while-drilling bumper sub was developed.

针对鉆井过程中常见的井下卡鉆事故，研制了新型全液压式随鉆震击器。

an apparatus and method for a modified horizontal directional drilling assembly for drilling pipe into a drilling surface.

用于将鉆桿鉆入鉆探面的改良型水平定向鉆探组件的器械和方法。

with a great development of petroleum industry in our country, the requirement of drilling pipe is not only big quantity but also good quality.

随着我国石油工业的高速发展，对石油鉆桿的需要不仅表现在数量上的增加，而且对鉆桿的质量也提出了更高的要求。

in order to improve on the properties of drilling pipe and its competitive price, a research on design and manufacturing high strength pipe is done based on a cooperation between dut and bao steel.

为提高国产鉆桿的市场竞争力，改善其使用性能，我们与宝钢合作，开展了《高强度鉆桿的开发》这一国家级课题。

this kind of tool can be connected between the drilling pipe to help the effective removing of the bed using its hydraulic and mechanical function.

该工具可以加接于鉆桿中间，利用其水力清除和机械破坏的双重作用来达到清除巖屑床的目的。

through the deep investigation and analysis of the drilling pipe failure, the main factors causing drilling pipe failure are found out.

通过对鉆桿失效问题的深入调查和分析，找出引起鉆桿失效的主要原因。

in drilling exploration and well drilling industry, the drilling pipe and drill collar are key apparatus.

鉆桿和鉆铤等管状螺纹连接件，是鉆探和石油鉆井工业中的关键设备。

then, the adoption of appropriate countermeasures has effectively prevented the failure of drilling pipe, thus guaranteeing the reliability of drilling pipe quality.

通过采用合适的对策，有效预防鉆桿失效，从而保证鉆桿的质量可靠性。

in addition, the force on drilling pipe during the killing is also be analyzed.

此外，本文还对动力压井过程中喷井中鉆具受力情况进行了分析。

despite early hopes that the oil spill could be minimized, the rig's fractured drilling pipe is currently leaking 42, 000 gal. of crude a day.

由于鉆油塔的管道断裂，每日漏油量为42000加侖，人们本以为可以将溢油量控制在最小量的希望破灭。