The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 23, 1991
Filed:
Nov. 14, 1990
Duane C Uhri, Dallas, TX (US);
Robin B Montgomery, Mesquite, TX (US);
Mobil Oil Corporation, Fairfax, VA (US);
Abstract
A method and apparatus to determine in-situ 'creep' displacement in a cored or drilled borehole. A borehole creep displacement (BCD) tool is suspended into the borehole via a wireline logging cable. Gaging piston fluid forces gaging pistons in a mechanical/electrical assembly of said tool to extend and contact the borehole wall which causes gaging pressure to build. Upon reaching a predetermined pressure, excess fluid flows into a micro-motion fluid distribution body and into an actuator assembly causing an accumulator linear variable displacement transformer (ALVDT) to move thereby causing electrical signals to be transmitted to surface equipment. Once the LVDT has been displaced fully, a closed fluid system within the gaging pistons and a micro-motion assembly is created. Thereafter, any movement of the gaging pistons by the borehole wall will cause fluid motion of a micro-motion cylinder which is attached to a micro-motion LVDT. Movement of the micro-motion LVDT can be read as displacement in thousandths of an inch or as a direct mechanical gain for estimating electrical values.