钻头

Some methods that are usually used now and their characteristics of bore-hole trajectory are introduced; Analysis the main factors which affect bore-hole trajectory; A model of rock-bit interaction is developed by accounting for the anisotropic drilling characteristics of both the formation and the bit; Base on the model of static behavior of a bottomhole assembly design a bore-hole trajectory; produce a demo of bore-hole trajectory base on 3DS Max.

本论文对井眼轨迹反演理论及方法作了简要的分类，介绍了几种目前常用的井眼轨迹反演方法及其特点；分析了影响井眼轨迹的主要因素；综合考虑地层和钻头的各向异性钻井特性，建立钻头与地层相互作用模型，基于钻柱底部组合力学模型设计出一条井眼轨迹；制作了基于3DS Max的井眼轨迹演示动画。

It is proposed that the appearance of a new kind of mud additive can not represent the formation of a new mud system . The main influence factors of flow resistance at drill bit nozzle are solid content , particle size distribution and hydrophilicity of solid . It is not suitable to use high shear viscosity of both Casson rheology model and determined to predict drilling efficiency .

全面、系统地论述了处理剂和泥浆体系的关系；聚合物的使用浓度应突破全絮凝点，实现低固相应以发挥聚合物的抑制作用为主，絮凝作用为辅；影响钻头水眼处流动阻力的主要因素是泥浆中的固相含量、粒度分布及固相的亲水性，用η_∞代表钻头水眼粘度是欠妥的；聚合物泥浆处理剂的发展主要是开发新的单体和研究新的复配物。

The paper presents the analysis of PDC bit structure commonly applied in colliery and coal field exploration and a brief introduction on processing technology and attentions which should be paid in application.

主要对煤矿和煤田勘探中常用的金刚石复合片钻头的结构进行了分析，并简要介绍了复合片钻头的加工工艺和使用中应注意的问题。

Often a sample is obtained with a coring bit. It cuts a clean cylinder of rock, from

地质学家需要知道钻头已以到达什么样的岩层，因此时常要用芯钻头取样。

The geologist needs to know what rocks the drill has reached, so every so often a sample is obtained with a coring bit.

地质学家需要知道钻头已经到达什么样的岩层，因此时常要用取芯钻头取样。

The geologist needs toknow what rocks the drill has reached, so every so often a sampleis obtained with a coring bit.

地质学家需要知道钻头已以到达什么样的岩层，因此时常要用芯钻头取样。

The geologist needs to know that rocks the drill has reached, so every so often a sample is obtained with a coring bit

地质学家需要知道钻头已经到达什么样的岩层，因此时常要用取芯钻头取样。

Drill tools, coring bit and casing bit have been designed and a complete set of equipments and tools have been formed. Rules of operation have been made to operate these equipments more proficiently.

完成了空气潜孔锤跟管取心钻具、取心钻头、套管钻头的研制，并配套了合理的设备和器具，制订了实用、操作性强的空气潜孔捶跟管取心钻进技术规程。

Geologist so every so often The geologist needs to know what rocks the drill has reached, so every so often a sample is obtained with a coring bit.

地质学家需要知道钻头已经到达什么样的岩层，因此时常要用取芯钻头取样。

A bit with a cutting blade that can be adjusted to different sizes.

有可以调整的不同尺寸的钻头的切刃的钻头。

Methods: Five patients with parkinsonism or dystonia were assigned to general anesthesia using an modified endotracheal tube.

本实验依照人体实验之相关规定进行，五位患有帕金森氏症或肌张力异常的病人接受神经立体定位手术。

If you can benefit from this book, it is our honour.

如果您能从本书获益，这将是我们的荣幸。