3) borehole instability
井壁失稳
1.
In the present,the typical experience can't solve all the problems of borehole instability.
以伊利石、伊蒙混层为主的硬脆性泥页岩微裂缝发育,容易引起井壁失稳,一直未能找到很好的评价方法。
2.
On the bases of mechanisms of borehole instability in hard brittle shale,one mud system have been established which is suitable for the formations of the hard brittle shale-the silicate drilling fluids.
在研究硬脆性泥页岩井壁失稳机理的基础上,有针对性的研制了一套适于硬脆性泥页岩地层的水基硅酸盐钻井液体系。
4) instability mechanism
失稳机理
1.
Experimental study on sidewall instability mechanism of oil wells in the western Tuha Oilfield;
吐哈西部油田井壁失稳机理实验研究
2.
The effect of nonlinearity of pitch moment coefficient and module of rigidity of torsion on conditions of stability, instability points and instability mechanism is analyzed.
分析了升力矩系数和扭转刚度的非线性特性对于稳定条件、失稳点以及失稳机理的影响。
3.
Since the loads on the coal pillar and roof system were non-uniformly distributed,the instability mechanism of the system under non-uniformly distributed loading was studied.
基于温克尔假设,把坚硬顶板视为弹性梁,把煤柱等效为连续均匀分布的支撑弹簧,从而形成煤柱-顶板相互作用系统的力学模型;基于尖点突变理论,对采空区煤柱-顶板系统失稳机理进行了探索,导出了该系统失稳的充要力学判据,并得出了顶板破坏的临界厚度;同时,分析了影响系统失稳的主要参数,并给出了若干工程建议;最后以甘肃省某煤矿为例,计算了该矿体的临界顶板厚度。
5) mechanism of instability
失稳机理
1.
Based on field test and theoretical analysis,the mechanism of instability of slurry-supported excavations was investigated from angles of soil arching effect,time-dependent effect,overall stability,.
同时,根据现场试验和理论研究成果,从土拱效应、时间效应、整体稳定性和局部稳定性等方面分析了泥浆护壁开挖的失稳机理。
6) borehole stability
井壁稳定
1.
A new method of predicting borehole stability while drilling based on seismic attribute technology;
基于地震属性技术的井壁稳定随钻预测新方法
2.
Research on in-situ stresses and borehole stability of coal seam in Jingbian gas field
靖边气田煤层地应力及井壁稳定研究
3.
Mechanical borehole stability test study in highly-dipped laminated formation
高陡层理性地层井壁稳定性模拟试验研究
补充资料：裂纹失稳扩展
分子式：
CAS号：
性质：材料内部裂纹尖端的应力场强度因子达到或超过材料的断裂韧性之后发生的裂纹快速扩展。裂纹失稳扩展将导致材料迅速断裂。
CAS号：
性质：材料内部裂纹尖端的应力场强度因子达到或超过材料的断裂韧性之后发生的裂纹快速扩展。裂纹失稳扩展将导致材料迅速断裂。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条