The unbalance of the formation stress causes collapses of a borehole wall.
地应力场的非平衡性使井眼产生崩落现象。
The electrodes are mounted on a pad that is pressed against the borehole wall.
测量过程中，电极放置在极板上紧贴井壁测量。
That part of a wireline logging tool that is pressed firmly against the borehole wall.
电缆测井仪器的一部分，测井过程中紧贴在井壁上。
It showed that eccentric pressure is produced by eccentric decouple charge blasting on borehole wall.
实验结果表明，偏心不耦合装药在孔壁上形成明显的偏心应力场。
An unfocused electrode device with small spacings, mounted on a pad and pressed against the borehole wall.
一种短源距不聚焦的电极系测井设备，安装在极板上紧贴井壁。
The pad holds sensors that are focused in one direction and must be as close as possible to the borehole wall.
极板上的探测器可以在一个方向聚焦，尽可能地贴靠在井壁上。
The relationship between borehole wall collapses, their directions and the formation stress field is discussed.
本文讨论了井眼崩落及其方位与地应力场的关系。
A continuous 360-degree annular space around casing allows cement to completely seal the casing to the borehole wall.
围绕套管的四周360度的环型空间允许水泥完全能够密封套管与井壁。
Mechanism of smooth borehole wall protection blasting and calculation method of the charge are analyzed in this paper.
分析了光面护壁爆破的机理和装药量的计算方法。
Shale stability coupling with mechanics and chemistry is a focus of attention in the field of borehole wall stability study.
泥页岩井壁失稳的化学与力学耦合作用是井壁稳定性研究中较为关注的问题。
The tool can provide us the 3D borehole wall images reflecting visual and accurate casing deformation, corrosion and faults.
该技术可提供井壁立体图，直观准确地反映套管状况，如套管变形、腐蚀穿孔和错断等。
The features and proportions of slurry and effect of borehole wall protection in different loose strata were mainly introduced.
重点介绍了松散地层不同地层泥浆特性、配比及护壁效果、措施。
Others have articulated joints attaching them to the logging tool, with a backup arm to press the pad against the borehole wall.
另有一些极板需要使用连接装置才能和下井仪器相连，测井时需要使用推靠臂才能紧贴井壁。
A distance that characterizes how far a logging tool measures into the formation from the face of the tool or the borehole wall.
表征测井仪器可以测量的从井壁(或仪器表面)到地层的探测距离。
Moreover, certain breakthrough has been achieved in high temperature artificial borehole wall sand control, so that it can al...
此外，由于高温人工井壁防砂技术取得了一定的突破，也可作为备选技术之一。
The shear stress on smooth blasting of pipe protecting borehole wall between free face and protecting face reaches as high as 3.
进行了光面护壁爆破和切缝护壁爆破技术的动态光弹性试验，获得了光面护壁爆破和切缝护壁爆破过程的等差条纹图。
The results show that:1)Under a periodical pulsed heat generation, the temperature of borehole wall has a fluctuant rising tendency;
实验结果表明：1）在周期性脉冲热流的作用下，钻孔壁温度呈周期性震荡并逐渐升高；
This paper introduced the principle and method of protecting borehole wall blasting and its application in the Dongxia and Weifang coal mine.
本文介绍了护壁爆破原理和方法以及其在东峡煤矿、潍坊煤矿的应用情况。
When the force can not contact drill string with one side of the borehole wall, the stiffness of drill string can influence the contact force.
当外力不足以使钻柱紧贴于井壁的一侧时，钻柱的刚度对钻柱与井壁之间的接触力有影响。
And the laboratory test proves that the technique of high temperature artificial borehole wall can satisfy the needs of sand control in the field.
而通过室内试验证明，高温人工井壁完全能够满足现场防砂要求。
Its application shows that:(1)a"mall-made borehole wall"produced by the side hydraulic tool plays a role of leak protection in the absorbent formation;
侧向水力工具在现场的应用情况表明：（1 ）利用侧向水力工具形成“人造井壁”屏蔽环的方法，在渗漏地层能起到较好的防漏作用；
There is stress concentration near borehole wall, where rocks drillability gets worse. It is explained that the side of PDC bits is easy to be damaged.
靠近井壁区域存在应力集中现象，岩石可钻性变差，这是PDC钻头外侧易损坏的原因。
Dynamic photo elasticity experiment is conducted, and the isochromatic fringes graphs in the process of smooth blasting of pipe protecting borehole wall is obtained.
进行了光面护壁爆破和切缝护壁爆破技术的动态光弹性试验，获得了光面护壁爆破和切缝护壁爆破过程的等差条纹图。
Considering the friction of borehole wall against water moving with high speed, a physical model of water stemming movement in water blasting is set up in this paper.
本文计及水在高速运动时与壁面的摩擦阻力，建立了水封爆破水塞运动的物理模型。
Meanwhile, the predicting method of stress is proposed based on BP's neural network by using the seismic interval velocity, in order to predict borehole wall stability.
同时给出了利用地震层速度预测地应力的BP神经网络模型，以在钻前预测井壁稳定性。
Most of the existing models for borehole wall stress are based on plane strain hypothesis. So some errors may be generated as compared with the real stress state of rock.
现有井壁围岩应力求解模型大都基于平面应变假设，相对岩石真实应力状态会有一定的误差。
At present, the most popular trenchless pipeline installation method is guided boring, but in the guided boring cave-in of the borehole wall eternally are encountered in quicksand formation.
目前最流行的非开挖铺管技术为导向钻进法，但这种施工法在流砂地层施工时容易发生塌孔。
The quantitative description of fractured zone with borehole wall unrolled images was studied; it is indicated that the percentage of image area is also applicable for fractured zone grading.
用数字钻孔摄像孔壁展开图上破碎区域面积占图像总面积的百分比可定量描述破碎程度。
The isochromatic fringes graphs of smooth blasting and cutting seam blasting of pipe protecting borehole wall were obtained upon dynamic photo-elasticity experiments on both kinds of blasting.
进行了光面护壁爆破和切缝护壁爆破技术的动态光弹性试验，获得了光面护壁爆破和切缝护壁爆破过程的等差条纹图。
The isochromatic fringes graphs of smooth blasting and cutting seam blasting of pipe protecting borehole wall were obtained upon dynamic photo-elasticity experiments on both kinds of blasting.
进行了光面护壁爆破和切缝护壁爆破技术的动态光弹性试验，获得了光面护壁爆破和切缝护壁爆破过程的等差条纹图。
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