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At last, the theoretical and statistical mechanical extending limits are compared and the laws of extending limits in shallow, mid-deep and deep wells are analyzed.
Thirdly, the mechanical extending limits for three-section directional wells under pick up and slack off operations in the sliding and rotary modes are respectively deduced and the charts of extending limits for kinds of directional wells are drawn.
The studies in this paper enrich the theories of extending limits in directional drilling and provide important guidance for design & control in actual drilling process.
Secondly, the prediction model of mechanical extending limits is built by introducing the objective function, constraint conditions, operation conditions and integral mechanical results.
With the increase of vertical and lateral extensions of directional wells in recent decades, extending limits of rotary drilling have attracted much attention.
From shallow, mid-deep to deep wells, the limit operation conditions, constraint conditions and measures to increase extending limits are different correspondingly.
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