Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...
Patent
1987-04-27
1988-09-13
Novosad, Stephen J.
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
175325, 166241, E21B 1710
Patent
active
047702583
ABSTRACT:
A length of drill string, or a sub, functions as a body to which an encircling sleeve is rotationally and axially secured. The sleeve is arranged to permit some radial movement on the body and is spring biased in one radial directiion. A radial projection of some axial length extends from the sleeve in the biased direction to engage the well bore wall. During drill string rotation, the projection engages a near side wall more forcefully than other parts of the well bore periphery. The forceful engagement between projection and wall deranges the tendency for a curved drill string centerline to lie in a stationary plane when the drill bit has a tendency to depart from an original course while drilling. The bias allows the sleeve to be pushed toward a more centralized position on the body but the fluid damping inherent by changing clearances between sleeve and body, while the tool is immersed in drilling fluid, retards the centralizing movement. The damping effect is influenced by drill string rotation and the rotation speed can be controlled from the surface.
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patent: 4638873 (1987-01-01), Welborn
patent: 4715453 (1987-12-01), Falgout, Sr. et al.
Jeter John D.
Neuder William P.
Novosad Stephen J.
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