David Lee Divine

US Patent:

42121981, Jul 15, 1980

Filed:

Mar 28, 1979

Appl. No.:

6/024630

Inventors:

David L. Divine - Midland TX

Assignee:

Texaco Inc. - White Plains NY

International Classification:

E21B 4706

US Classification:

73151

Abstract:

A borehole pressure sensing system includes a tool having an outer shell having an end which enters a borehole, traversing an earth formation, first. The end has an opening extending from the interior of the tool to the borehole. A pressure sensitive device is inserted in the opening. Bourdon-tube apparatus is arranged with the pressure sensitive device so that as the borehole pressure changes the bourdon-tube apparatus will change its rotational position around the longitudinal axis of the opening. An encoder includes a mask having opaque and translucent areas and is affixed to the bourdon-tube apparatus so that as the bourdon-tube apparatus changes its position, the mask is rotated accordingly. A light grate, spatially related to the mask, divides a received light beam to provide a plurality of light beams in a manner to impinge on the mask. A transmission subsystem of light conductors comprises one conductor which conducts light from the surface to the grate.