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- double-pipe borehole wall protection blasting 光面护壁爆破
- Borehole Wall Protection with PVC Pipes for Jet Grouting in Loose Gravel Ground 松散卵石层高压旋喷中的PVC管护壁问题
- borehole wall protection 护壁
- Based on the characteristics of environmental scientific drilling and in accordance with the main problems existed, this research project centres on the coring technique and the borehole wall and core protection technique by drilling fluid. 本研究根据环境科学钻探的特点和存在的主要问题,重点开展取心技术和钻井液护壁护心技术研究,以解决环境科学钻探工程中取心率低、孔壁稳定性差这两大技术难题。
- 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。
- Good economic efficiency can be obtained when this mud is applied in borehole wall sloughing in water sensitive shales. 该体系可解决强水敏页岩的井眼失稳问题 ,具有良好的经济效益。
- There is stress concentration near borehole wall，where rock s 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。
- That is, high core recovery and borehole wall stability would be mainly realized by new type fluidic coring tools and environmental protective drilling fluid system(Epm). 重点通过研制新型射流式取心钻具和环保型钻井液体系(EPM)来实现提高岩心采取率和孔壁稳定性的预期目标。
- The limit value of drilling fluid density for avoidingthe borehole wall instability and the hydrostatic column pressure model were also determinedin this paper. 并根据井壁面岩块的极限稳定条件，建立了防止井壁岩块失稳的极限及井内钻井液柱压力模型。
- Especially in nonresistant strata，in order to keep borehole wall stability we usually raise the drilling fluid density，but it seriously impede the rate of penetration. 尤其是不稳定地层，常常靠提高钻井液密度来保证井壁稳定，严重的制约了钻速的提高。
- 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。
- The borehole ultrasonic imaging method can precisely reflect the smoothness of the borehole wall, and then judge the weathering degree of the rock and determine thickness of the weathering bed. 摘要钻孔超声成像方法能精确地反映井壁的光滑情况，进而判断岩石的风化发育程度，确定风化层的厚度。
- The bored pile by churning drive and bored pile with slurry wall protection are widely adopted in loess foundation in recent years. 摘要旋挖钻孔灌注桩和泥浆护壁钻孔灌注桩是近年来黄土地基中广泛使用的桩基形式。
- North W12-1 Oilfield in Zhanjiang of Guangdong province has drilling problems of borehole wall collapse and stripping, which had often caused accidents of well and instrument burial. 摘要广东湛江W12-1北油田开发过程中遇到了钻井中井壁易垮塌、易剥落的难题，易造成井壁坍塌、掩埋钻井及仪器事故。
- The echo time image of cir- cumferential borehole imaging log(CBIL)can visually depict the behaviors of borehole wall such as wellbore avalanche, fracturing under reservoir bed stress. 井周声波成像测井(CBIL)回波时间图像能够直观地反映储层应力作用下的井壁表现如井眼崩落、裂缝等,根据这些应力响应特征可以判断储层的应力方向。
- The dynamic boundary condition between revolving drill string and borehole wall is one of the fundamental research contents of drilling string dynamics and torque and drag calculation. 旋转钻柱与井壁的碰撞摩擦边界是钻柱动力学研究和摩阻扭矩计算的基础研究内容。
- SC can remarkably inhibited mud shale dispersion, keep the borehole wall steady.At the same time, on the base of inherent these, SC form hydrophobic property membrane on the drill bit and BHA. 实验表明，本文所研究的产物中具有一定分子参数的共聚产品耐盐、抗钙、耐温性好，具有较强的抑制性和润滑性以及降失水能力，是一种多功能的新型两性离子聚合物。
- Therefore, it is of great importance to summarize previous experience and systemize the studies of ancient city wall protection to improve relevant practices in the future. 总结实践经验，系统研究我国古城墙保护的理论，对指导和推动今后的城墙保护工作有着重要的现实意义。
- The LWD density logging was influenced by several factors such as bore size,stand off between logging tool and borehole wall,mud density,mud cake,cuttings,water cushion and mud invasion. 水平井随钻过程中的密度测井要受井眼尺寸、仪器和井壁的间隙、泥浆比重(含氢量)、泥饼、岩屑、水垫、泥浆侵入等环境影响。
- The borehole ultrasonic imaging method can precisely reflect the smoothness of the borehole wall, and then judge the weath-ering degree of the rock and determine thickness of the weathering bed. 钻孔超声成像方法能精确地反映井壁的光滑情况,进而判断岩石的风化发育程度,确定风化层的厚度。
