Surge pressure is a major factor which affects borehole stability.
波动压力是影响井眼稳定的主要因素。
Increased core rate and to maintain borehole stability obtained is crucial to fully evaluate the oil shale.
提高取心率与保持井壁稳定性是对油页岩充分评价的关键性技术。
Then by selecting appropriate strength criteria, the borehole stability analysis model for gas drilling can be set up.
最后选择适当的强度准则，形成气体钻井井壁稳定性分析模型系统。
For the successful operations of drilling and completion of the branch wells. it is necessary to maintain borehole stability in construction process.
为了保证分支井钻井和完井作业的顺利进行，必须在施工过程中确保井眼的稳定。
The mechanics theory of the borehole stability and H-B's nonlinear criterion are used to establish the equations for slip failure of the rock mechanics around borehole.
应用井眼稳定力学理论和H - B非线性准则，建立了井眼围岩力学滑移破坏方程。
The specific surface area is closely related to shale waterize property, property of mechanics and weeping property. It is a key factor for evaluating borehole stability of mud shale.
泥页岩比表面积与泥页岩水化特性、力学性质以及渗水性密切相关，是评价泥页岩井壁稳定性的关键参数。
The negative pressure for under balanced perforating is a key parameter in well perforating design. It can directly influence the productivity and borehole stability of a perforated well.
负压射孔技术的关键参数之一就是负压差的大小，它直接影响油井射孔完成后的产能以及孔眼的稳定性。
Preexisting research shows that there are three main factors that affect the borehole stability of Air-Drilling: mechanical reason, hydration reason and the Weaked surface instability reason.
研究表明，影响空气钻井井壁稳定的主要因素有三个：力学不稳定，水化不稳定和岩体破裂或弱面不稳定。
The drilling machine structure is compact, and at the same time promote the carriage with adjustable compensation function, when drilling carriage support on the ground, borehole stability is good.
该钻机结构紧凑，同时推进滑架具有伸缩补偿功能，钻孔时滑架支撑在地面上，钻孔稳定性好。
The results may be applied to analyze the stability of borehole or tunnel.
其结果可以应用到分析井孔和巷道的稳定性。
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。
By analyzing the rock stress state around the elliptic borehole, the stability conditions are established for different types of formation.
进而通过对椭圆形井眼周围岩石应力分布的分析，对不同岩性的地层确定了不同的井眼稳定性条件。
A technique of variable-error iterative searching solution for equivalent formation conductivity is developed. The accuracy and stability of borehole correction are improved.
通过优选建立了等效地层电导率变误差迭代搜索方法，提高了井眼环境校正的精度和稳定性。
In this paper, the problem about stability of the drill stem in the borehole with iso-curvature is studied by use of energy method.
文中利用能量法，研究了等曲率井眼中钻柱的稳定性问题。
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。
Whether the parameter is accurately calculated or not directly affects the evaluation precision of borehole mechanics stability.
该参数计算的准确与否直接影响到井壁力学稳定性评价的准确性。
It's main functions are maintaining borehole gage. Improving drill string stability and protecting lower drill string from excessive wear.
其主要作用是保持钻孔尺寸符合标准，提高钻杆稳定性，避免钻杆下部过于磨损。
Its main functions are maintaining borehole gage, improving drill string stability and protecting lower drill string from excessive wear.
其重要作用是保持钻头尺寸符合标准，提高钻杆稳定性，避免钻杆下部过于磨损。
Its main functions are maintaining borehole gage, improving drill string stability and protecting lower drill string from excessive wear.
其重要作用是保持钻头尺寸符合标准，提高钻杆稳定性，避免钻杆下部过于磨损。
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