The transformation of the pressure distribution and the air bearing force under the collective effect of radial velocity and skew angle was investigated during seeking process.
以负压Pico磁头作为物理模型,模拟了磁头在磁盘半径方向寻轨时,磁头径向速度、斜角值的改变对磁头压强的分布和气膜承载力的影响。
Before target-entering into a horizontal well or in the process of drilling horizontal section,to confirm the controlling range of deviation angle and azimuth of hole section is not only an important measure to guarantee target rate and trajectory control accuracy of the horizontal well but also one of the important contents in trajectory supervision of the horizontal well.
在水平井入靶前或水平段钻井过程中,确定待钻井段井斜角和方位角的控制范围是保证水平井中靶和轨迹控制精度的关键,也是水平井井眼轨迹监控的一项重要内容。
Due to the complicated calculation formula and trivial deduction course proposed by predecessor, this article derivated a new calculation formula for circular arc well section deviation angle and positional angle based on increment of coordinate identical equation.
前人提出的圆弧井段井斜角和方位角的计算公式具有计算复杂、推导过程烦琐等缺点,为此以坐标增量恒等式为基础,使用初等方法推导出了一组新的圆弧井段井斜角和方位角的计算公式。
The relationships between the critical density and critical salt content of drilling fluid and hole azimuth and deviation angle in horizontally isotropic and anisotropic formation respectively, are studied.
采用常规三轴压缩 Drucker- Prager破坏准则 ,进行了在水平各向同性地层和水平各向异性地层条件下 ,对保持井壁稳定所需的临界钻井液密度和临界钻井液含盐量与井眼方位角和井斜角之间的关系进行了分析和计算 。