Abstract: An improved metal seal useful in conjunction with a pressure transducer or other pressure device or vessel. The pressure transducer comprises a pressure housing having an open end and having a housing wall. The housing wall preferably has internal threads and has a terminal end. The pressure transducer has a chamber defined by the housing wall of the pressure housing. The pressure transducer has a mating piece which engages the pressure housing, thereby enclosing the chamber. The mating piece has an externally threaded end for engaging the internal threads of the housing. The mating piece employing the invention has an overlap for engaging the terminal ends of the housing wall to prevent the housing wall from expanding and for forming a seal therewith. The overlap prevents the housing walls from expanding due to high pressures contained in the chamber of the pressure housing. Consequently, by using the overlap, pressure transducers having thin walls are able to withstand higher pressures.
Abstract: 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.
Abstract: Apparatus for digitally recording the value of pressure and temperature, or other parameters, in a borehole logging instrument. In one embodiment the values of the earth parameter are converted to an A.C. signal, the frequency of which is a function of the value of the parameter. Clock means are provided for presenting, at selected time intervals, voltage pulses of selected short time length. The A.C. signal is gated to a counter for the selected short interval of time, and the count of the counter becomes a measure of the parameter. Solid state memory means are provided, and the output of the counter in the form of binary bits is stored in the memory. Means are provided for retrieving the instrument and reading out of the memory the binary bits as stored.
Abstract: A gauge for remotely indicating the pressure in a subterranean formation penetrated by a bore hole, including a tubular closed housing, the lower end of the closed housing forming an integral diaphragm which is subjected to the pressure of the subterranean formation, the housing having an internal reduced diameter portion adjacent the diaphragm forming an integral circumferential ledge, a cup shaped stator element having a closed bottom and opened top, the external diameter of the stator element being slightly less than the internal diameter of the housing and having an enlarged external diameter lip which engages the internal ledge of the tubular housing to precisely position the stator element relative to the diaphragm, the stator element having a conductive surface on the lower end thereof spaced adjacent to the diaphragm forming therebetween a capacitive relationship responsive to pressure deflection of the diaphragm, means of connecting the end of the housing opposite the diaphragm to a conductive cable