钻进

The axial force and torque of taphole drill are analysed.

通过对开铁口机轴压扭矩的分析和研究，得出了在旋转钻进过程中增加冲打是提高钻进速度的有效手段。

And some test indices obtained from different geological units in Beijing area are selected and studied contrastively.

研究目的：确保高质量地搜集北京地区锤击取芯钻进和回转钻进工法土样的试验成果数据，分析不同工法试验指标的关系，针对北京段的地层条件，给选择可靠的备选钻探方法提供技术依据。

Compare with the ability of eliminate the foam, Throught the test to discover, the taper of the diffuse pipeline of the eliminating-foam equipment can not small, the taper of the diffuse pipeline greater than 79/350; The length of the diffuse pipeline of the eliminating-foam equipment greater than 350mm; Whether the speed of the foam can too high, the velocity of the foam 0.3～0.6m/s; The width of lacune is between 0.2 and 0.5mm.

由于泡沫的流变性难以控制和测试，其变化较大，提出以利用所有泡沫钻探生产的钻进压力值，利用数学分析的方法对这些钻进压力值进行分析，在此基础上总结出更加合适、简捷的泡沫灌注压力公式。

The stability was increased by reducing the side load on the bit.The field applications in Lipan indicate that this new PDC bit has better performance i...

在临盘区块多口定向井的现场应用表明，新型定向井PDC钻头滑动钻进时钻压变化的敏感度小，工具面可控性好，复合钻进机械钻速和定向井机械钻速较常规PDC钻头都有较大幅度提高，且提高了钻井和下套管效率及井身质量。

However, during borehole grouting pile construction of the present, round section piles are used universally. Generally speaking, the boreholes are drilled by a large diameter round piling bit. Because of the restriction of factors of the mud pumps, and drilling equipments, and drilling technique, it would result in such problems as fol lowing: a bigger cutting area and overlarge cuttings volume, and more hole bottom sediments, difficult cuttings discharging, and serverely repeat cuttings breaking, and using more concret grouting amount, and lower drilling speed, faster bit wearing, and longer working period, bigger material and labor ex haust, and higher engineering cost, unreasonable ratio of loading capacity to volume of pile foundation, and lower comprehensive economic benefits, and so forth.

然而，钻孔灌注桩施工中，目前最为普遍采用的是圆形断面桩基，一般采用大口径圆形基桩工程钻头，由于国内生产的泥浆泵、钻具及钻进方法等因素的限制，从而使钻孔破岩面积和体积过大，造成孔底沉渣过多，排渣困难且排浆量大，重复破碎问题突出，混凝土灌注量大，直接反映为钻进效率低、钻头磨损快、施工工期长、材料能耗和劳动消耗大、工程成本较高、桩基荷载能力与体积比不合理、综合经济效益不理想等，这些问题严重影响和制约着钻孔灌注桩施工技术的发展和进步。

The course of heat conducting in the drills has a detailed analysis first time, and it's pointed out that the loss of heat energy can be decreased through the reduce of distance between heating resistant element and inner casing of the subterrene drills, and thickness of the shell.

钻进压力对钻进速度的影响与地层中的空隙和孔隙有关，即地层越松散，钻压的影响越大，可以与热熔器的热功率一样，采用比钻压的概念，即在热熔器单位横截面积上的钻压值。

When the guide hole drilling is completed, unloaded oriented bit, to accommodate tube launchers and connect with reverse bore bit and rotary joint, Then after the rotary joint drill pipe connected to Rafah, to Reamer drilling.

当导向孔钻进完成后，卸下导向钻头、发射器容纳管，接上反向扩孔钻头和旋转接头，然后在旋转接头后接上回拉钻杆，进行回拉扩孔钻进。

Based on the theory study, a directional drilling guidance system is developed for practical require, its working flow as follows: before construction, design the best track practically, and save in the system. During drilling, the system measures well oblique angle and azimuth to watch well track. Drill driver compares designing well track with measuring track showing on display unit, controls joy stick experientially, adjusts drill direction, finally realizes directional drill.

在理论研究的基础上，结合实际需要，研究设计了一种定向钻井导航系统，使用该系统进行定向穿越施工的工作过程如下：在施工前，根据实际情况，先设计一条最佳穿越路线，存入系统；在钻进中，系统通过对井轨的井斜、方位等参数的测量，对其进行实时监测；地面的司钻手通过对显示仪所显示的实际井轨参数及设计井轨参数进行比较，根据经验操纵操作杆，调整钻机前进方向，以达到对钻进过程的控制，最终实现定向钻井。

In this paper, the drilling melt penetration, bit used and rocks drilled are introduced.

介绍了所用的钻进试验台、热熔钻头、所钻的岩石和钻进工艺。

In order to analyzes the soil deformation mechanism under the impact load of the step-bit, the finite element model of impact and displacement drilling with down the hole hammer is established on the basis of adopting Drucker-Pager yield criterion, taking soil as DP materials and simulating the drilling process by applying the impact load on soils.

为了分析阶梯钻头冲击挤密作用下土体的变形机理，将土体视为DP材料，服从Drucker-Prager屈服准则，通过钻具与土体之间的接触以及施加冲击载荷来模拟钻进过程，建立了潜孔锤冲击挤密钻进的有限元模型。

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。