System provides new approach for directional drilling

In collaboration with Japan National Oil Corp., Sperry-Sun, Houston, has designed a completely new approach for rotary steerable drilling. Click here to enlarge imageUsing point-the-bit technology, the assembly steers the wellbore in any desired direction while rotating the drillstring.Design Click here to enlarge imageThe technology utilizes a shaft that is mounted with bearings at each end (Figs. 1 and 2). The outer housing is free to rotate, but the speed of rotation is restricted to about 2 rotations/hr by an antirotation device. Click here to enlarge imageThe driveshaft is deflected midway between the bearings by a pair of eccentric rings through which the shaft passes. By rotatin...

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