Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Earth stresses
Patent
1990-11-14
1991-07-23
Raevis, Robert
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Earth stresses
G01B 500
Patent
active
050333070
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.
REFERENCES:
patent: Re32070 (1986-01-01), Vezin
patent: 3572114 (1971-03-01), Ruppeneit et al.
patent: 3896663 (1975-07-01), Ogura
patent: 4491022 (1985-01-01), de la Cruz
patent: 4825701 (1989-05-01), Holtslander
Montgomery Robin B.
Uhri Duane C.
Malone Charles A.
McKillop Alexander J.
Mobil Oil Corporation
Raevis Robert
Speciale Charles J.
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