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Gauge-for-remotely-indicating-the-pressure-of-a-subterranean-formation

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Gauge for remotely indicating the pressure of a subterranean formation

Details

Inventors: Clark, Kenneth K.;
Assignee: Geophysical Research Corporation (Tulsa, OK)
Primary Examiner: Woodiel; Donald O.
Assistant Examiner:
Attorney, Agent or Firm: Head, Johnson & Chafin

An apparatus particularly adaptable for recording pressure of subterranean formations in a downhole pressure gauge by providing a variable capacitance in response to changes in ambient pressure. The apparatus comprising a closed tubular housing having a deformable conductive end with an interior and exterior surface, the deformable end forming a diaphragm subject to the pressure in which the housing is positioned, increased pressure deflecting the deformable end inwardly. The deformable end has an axial boss portion extending inwardly from the inner surface. A stator having a central hub is positioned within the housing, the hub having an opening therein which receives the boss portion. The stator has a planar portion positioned adjacent to and spaced from the interior surface of the housing deformable end, the portion of the planar surface of the stator adjacent the housing deformable and interior surface being of conductive material forming a capacitive relationship between the housing deformable end so that when the deformable end is concaved inwardly by increased ambient pressure of the fluid environment in which the apparatus is positioned, the capacitive relationship between the stator and the deformable end changes to provide an indication of the amount of ambient pressure applied to the exterior of the housing.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawing, and first to FIG.
1, a cross-sectional view of an instrument which is suitable for positioning in an oil or gas well for measuring the pressure within the well is disclosed.
The apparatus includes a tubular housing 10 having a tubular lower portion 12.
Between the housing 10 and lower portion 12 is an isolation plug 14 which serves to isolate the interior of the housing lower portion from the ambient pressure surrounding the gauge.
The actual construction of the housing 10, lower portion 12, and isolation plug 14 may vary in many respects.
The housing lower portion 12 includes a closed end 16 having as best seen in FIG.
2, an outer surface 18 and an inner surface 20.
The closed end 16 is of a preselected thickness, according to the diameter of the lower portion 12 and the pressure ranges to which the gauge is designed, such that the end 16 is deformed or deflected by the ambient pressure to which the gauge is subjected.
The higher the ambient pressure, the more the deformable end 16 is deflected inwardly.
Integrally formed with the deformable end 16 and extending axially inwardly from the interior surface 20 is an integral boss member 22.
Positioned within the interior of housing lower portion 12 is a stator member generally indicated by the numeral 24.
The essence of this invention is the stator member 24 and its relation to the deformable end 16 having an integral boss 22.
Stator 24 includes a central hub portion 26 and integral radially extending planar portion 28.
The planar portion 28 has a lower surface 30 which is adjacent to and spaced slightly from the deformable end interior surface 20.
The hub portion 26 includes an opening 32 which receives the boss 22.
In the preferred and illustrated arrangement, opening 32 includes an inwardly extending reduced internal diameter lip 34 having an opening 36 therein which receives the boss portion 22.
Stator 24 may be retained in position on boss 22 by bonding cement applied at lip 34

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