The failure of BHA with stabilizers is important among drilling string failures.
带扶正器下部钻柱组合的失效是钻柱失效的一种很重要的类型。
Dynamic vibration equation of drilling string is established based on the theory of dynamics.
根据动力学理论建立钻柱动力学振动方程。
A drilling string works in a very complex stressed environment downhole, even in corrosive media.
钻柱在井下的受力极度复杂，甚至工作在腐蚀的介质中。
At present, axial load and excited origin of drilling string lateral vibration is usually neglected.
目前对钻柱横向振动的研究基本上忽略了横向振动的激发来源和轴向力的存在。
The rule of lateral vibration under axial load was studied in theory, the inherent frequency of drilling string was obtained.
从理论上分析了轴向载荷存在的情况下钻柱横向自由振动的规律，获得了钻柱横向振动固有频率。
On the system dynamics, the dynamics model for roller cone bit under the interaction of drilling string and rock was established.
从系统动力学的角度出发，建立了基于钻柱、岩石相互作用下的牙轮钻头动力学模型。
The dynamics of roller cone bit under the interaction of drilling string, bit and rock during the drilling process was investigated.
研究了钻井过程中钻柱、钻头、岩石相互作用下的牙轮钻头动力学特性。
During the horizontal drilling, the vibration of drilling string will easily cause the damage on the FEWD equipment and a huge economic loss.
在水平井地质导向钻井过程中，井下钻具振动易导致井下FEWD测量仪器损坏，造成巨大经济损失。
So, it is necessary to have a stabilized platform in the tool to obtain steady angle adjustable and independent to the rotation of drilling string.
因此，在调制式旋转导向工具中，就必须设置一个不受钻柱影响的、可以自动保持和调整工具面角度的稳定平台。
The theoretical study for drilling string has been in progress for many years, but the real working state of drilling string still remains to be solved.
对钻柱在井下的受力状况已进行过许多理论研究，但对钻柱在井下的实际工作状态的研究还不多。
Drill string vibration is a common phenomenon in the process of well drilling. Drilling string resonance is the main reason of the drilling string failure.
钻柱振动是在当前钻井工程中的普遍现象，对钻井的影响很大，钻柱共振是钻柱失效的主要原因。
And the larger the mass of the additional system, the greater the amplitude formed after exciting, the more obvious the amortization effect on drilling string.
附加系统质量越大，受到激励后的振幅越大，对钻柱的减振作用越显著。
Establish the erosive wear mechanism of drilling string in air drilling and put forward that erosion wear is a substantial cause to promote drill string failure.
初步确立了空气钻井钻柱冲蚀磨损机理，提出钻屑冲蚀是促使钻具失效的一项重要原因。
Taking the well Hong 9 1 in Dagang Oil Field for example, the important role of the rotation of drilling string in removing cuttings bed in extended reach well is expounded.
并以国内大港油田大位移井红9—1为例，说明了钻柱旋转在大位移井中对清除岩屑床的重要作用。
Crack size, hammer stroke frequency and rotary speed influence the drilling string fatigue life involve, in which the crack size and stroke frequency were two major factors.
影响钻柱疲劳寿命的因素包括钻柱裂纹尺寸、空气锤冲击频率、转盘转速等，而空气锤冲击频率与裂纹尺寸是影响钻柱疲劳寿命的两大主要因素。
Then, the vibration law is applied in the field. The study provides the theoretical ground for deep Wells to reduce the drilling string failure and optimize the drilling string design.
然后，结合实际对振动规律进行了应用，该研究为减小深井钻具损坏和优化钻具设计提供了理论依据。
On the basis of the interaction model between formation and rock bit, a lateral vibration dynamic model of the rock bit was established under the interaction between drilling string and rocks.
在建立牙轮钻头与井底岩石互作用模型的基础之上，建立了基于钻柱和岩石互作用下的牙轮钻头横向振动动力学模型。
The calculation method of drilling string axial vibration is given. Meanwhile, the different methods of analysing drilling string axial vibration state are supplied in different surveying condition.
并给出计算任意组合钻柱系统的轴向振动稳态响应的一般方法，提供不同测量条件下分析钻柱轴向振动状态的不同方法。
The calculation method of drilling string axial vibration is given. Meanwhile, the different methods of analysing drilling string axial vibration state are supplied in different surveying condition.
并给出计算任意组合钻柱系统的轴向振动稳态响应的一般方法，提供不同测量条件下分析钻柱轴向振动状态的不同方法。
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