Constant bottom contact thruster

Details Constant bottom contact thruster Constant bottom contact thruster

1996-10-16

1999-03-23

Dang, Hoang C.

Boring or penetrating the earth

With tool shaft detail

Axially telescoping shaft section

175324, E21B 1707

Patent

active

058847162

ABSTRACT:
The present invention is an improved apparatus for controlling the weight on the drill bit during operation. In this invention, an inner mandrel has a telescoping movement in response to added drill string length at the surface. As the inner mandrel telescopes closed, it approaches a restrictor which is fixedly disposed in the lower housing of the drill string assembly. When the inner mandrel mates with the restrictor, a stand-pipe pressure increase noticeable to the operator occurs. The operator then stops the drill string and allows the motor to drill ahead. As the motor drills ahead, the inner mandrel telescopes open and the operation is then repeated.

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Article Entitled "Drilling bumper subs improve deviated well economics," Technology At Work, Reprinted from Feb. 1995 World Oil.RTM..
Baker Hughes Technical Data Sheet Article Entitled "Slimhole Thruster".

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