error analysis of axial position and measuring equipment design for nc machine tool

1、

this opens a new way to predict bottomhole pressure of under-balanced wells using the artificial neural networks method.

这为实际应用中使用人工神经网络方法预测欠平衡钻井系统井底压力开辟了一个新途径。

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2、

exact solution and typical curve of bottomhole pressure on confined two layer crossflow reservoir perforated partially

单层开采的封闭边界2层越流油藏井底压力的精确解及典型曲线

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3、

using the technology, the best geological target can be gotten by controlling the bottomhole drill tools.

使用这一技术，可以精确地控制井下钻具命中最佳地质目标。

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4、

studies on mechanism of interference between pdc cutters and bottomhole

PDC切削齿与井底干涉机理研究

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5、

this paper introduces the development situation, basic concepts and mathematical model of bottomhole pressure about under-balanced drilling technology.

较详细地论述了欠平衡钻井技术的发展概况，基本概念和井底压力的数学模型。

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6、

optimum design of pendulum bottomhole assembly with double stabilizers

双扶正器钟摆钻具组合的优化设计

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7、

numerical analysis on the influence of jet-flow types on bottomhole flowing field of rotary bit

旋转钻头射流方式对井底流场影响的数值剖析

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8、

an application of neural network in developing a model for predicting flowing bottomhole pressure of flowing wells

用神经网络建立自喷井井底流压预测模型

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9、

three-dimensional differential equations for bottomhole assembly under large deflection

下部钻具组合三维大挠度微分方程的详细推导

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10、

relation between bottomhole pattern and hit structure

井底模式与钻头结构关系

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11、

nonlinear dynamic analysis for bottomhole assembly

下部钻具组合的几何非线性动态特性分析

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12、

many calculating methods of bottomhole flowing pressure on multiphase vertical tube flow have been proposed.

半个多世纪以来，国内外学者已经提出了许多垂直管多相流井底流压的计算方法。

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13、

the hydraulic design principle and field test of bottomhole differential pressure decreasing nipple are introduced.

提出了最新研制的井底降压差短节的设计原理，介绍了其水力参数设计和现场试验情况。

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14、

numerical simulation of pressure characteristics of multi jets impinging on the bottomhole

多股受限撞击射流井底压力特征的数值模拟

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15、

a numerical study on cross flow characteristics of a jet impinging on the bottomhole

撞击射流井底漫流特性数值研究

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16、

analysis of vibration property for drilling string and discussion on recognition method of bottomhole lithology

钻柱振动特性分析与井底岩性识别方法初探

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17、

planar analysis of the static behavior of a bottomhole assembly under large deflection

石油钻井底部钻具组合平面纵横弯曲大挠度分析

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18、

numerical simulation of swirling jet in flow field at bottomhole

锥形旋转射流井底流场的数值模拟

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19、

the forming mechanism of three lobes pattern on the bottomhole rock surface

井底岩面上三凸起型式的形成机理

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20、

bottomhole stress analysis and breaking mechanism research in underbalanced drilling

欠平衡钻井井底岩石应力状态分析和破碎机理研究

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