Abstract: A system for providing D.C. power at the earth's surface to a downhole well tool in a case hardened side pocket mandrel using an inductive coupling system where the mandrel has a pressure sealed probe member sealingly attached in a side pocket of the mandrel. The probe member extends externally to a cable conductor and is enclosed in a protective housing. A surface located D.C. power source is connected by the cable to a downhole square wave oscillator with a full wave driver to power an inductive coil in the probe member. The end socket of the tool has an inductive coil connected to a full wave rectifier in the tool for providing power to the tool. Pressure sensors in the tool are used to develop frequency shifted key signals to the cable via the inductive coils which provide a digital current modulation and which is detected at the earth's surface.

Abstract: An inductive coupling device for coaxially arranged tubular members where the members can be telescopically arranged and the liner member has a magnetic core assembly constructed from magnetic iron with cylinder sloped ends and the outer member has an annular magnetic assembly aligned with the core assembly. The tubular members are non-magnetic enclosures and together with a gap spacing define an effective air gap.

Abstract: System for the input and output of data on a two wire system with a downhole well tool which has a system with sensor devices, a processor, a clock, a memory and a voltage/current communications device which are all powered by a d.c. battery. A phone jack and phone plug connection at the earth's surface enables an operator with a controller to input and output data to the well tool without disassembly and enables setting the clock in the well tool to a selected real time value. This enables synchronization of real time values of data recordings for different tools.

Abstract: A capacitor device for utilizing dependent capacitances for measurement purposes wherein facing surfaces have pairs of capacitors constructed and arranged relative to a displacement axis so that a first pair of capacitors define measurement capcitors and a second pair of capacitors define reference capacitors and capacitance measurements from the capacitors can be combined to minimize effects of relative displacement in the facing surfaces.

Abstract: A low pressure capacitance measurement device where capacitance base members are constructed from metal and one of the base members arranged to be torqued relative to the other base member where the stress level is maintained within the elastic limits of the metal and the torque force is developed by a bellows which acts on a moment arm to torque the base member about its torque displacement axis.

Abstract: A pressure transducer system for developing accurate pressure measurements with a torque driven pressure transducer where the transducer has dual capacitor devices in tandem and mechanically coupled to permit relative displacement along a elongated axis in response to temperature and where the devices are displacable by angular torque about the elongated axis to obtain independent correlatable measurements from the dual capacitor devices.

Abstract: A gauge carrier for absorbing longitudinal and radial shock forces on a shock sensitive gauge in a gauge housing where the gauge is insertable and retrievable with a unit assembly. The gauge or gauges are coupled to a longitudinal shock absorber comprised of belleville springs by a ball and socket arrangement to isolate longitudinal shock waves from the gauge while annular resilient members provide radial shock absorption for the gauge in the housing. The longitudinal shock absorber can be selectively pre-loaded.

Abstract: A dual capacitor device for utilizing dependent capacitances for measurement purposes where an upper capacitor base member and a lower capacitance base member are arranged with parallel capacitor surfaces in horizontal planes and where the parallel capacitor surfaces are located on opposite sides relative to a vertical axis to define first and second capacitors. The lower capacitor base member has a centrally located section connected to an outer section of the lower capacitor base member by a torsion beam and the centrally located section is attached to the upper capacitor base member by a vertical arm member. The torsion beam means has a displacement axis normal to the central axis so that angular displacement of the torsion beam and the centrally located section about the displacement axis produces a capacitance change in the first and second capacitors.

Abstract: A dual capacitor device for utilizing dependent capacitances for measurement purposes where a first capacitor base member and a second capacitance base member are arranged with parallel capacitor surfaces in parallel planes and where the parallel capacitor surfaces are located on opposite sides relative to a central transverse plane to define first and second capacitors. The second capacitor base member has a centrally located section connected to an outer section of the second capacitor base member by a torsion beam and the centrally located section is attached to the first capacitor base member by a coupling member. Angular displacement of the outer section relative to the centrally located section about the displacement axis produces a capacitance change in the first and second capacitors.

Abstract: A dual capacitor device for utilizing dependent capacitances for measurement purposes where an upper capacitor base member and a lower capacitance base member are arranged with parallel capacitor surfaces in horizontal planes and where the parallel capacitor surfaces are located on opposite sides relative to a vertical axis to define first and second capacitors. The lower capacitor base member has a centrally located section connected to an outer section of the lower capacitor base member by a torsion beam and the centrally located section is attached to the upper capacitor base member by a vertical arm member. The torsion beam means has a displacement axis normal to the central axis so that angular displacement of the torsion beam and the centrally located section about the displacement axis produces a capacitance change in the first and second capacitors.

Abstract: A transducer for measuring a moment force as a related function of pressure and tension where a spirally wound bourdon tube has a confined end arrayed to apply a moment force to pretensioned metal vibratory elements. The change in tension in the pretensioned vibratory elements produces a change in frequency which is related to pressure in the bourdon tube. The vibratory elements are maintained at equally applied tension so that a temperature change changes the frequency of the vibrating elements and can be utilized to correct pressure measurements.

Abstract: A vibratory force transducer comprising a vibratory beam (21) of rectangular transverse cross section having a uniform thickness t, a major span section of length L.sub.1 and width w.sub.1, and at least one end of the major span having an adjoining tab of greater width W.sub.2 and length L.sub.s. The beam is driven by electrical excitation to vibrate at resonant frequency in a given direction. The tab provides the beam with an effective length which is a function of length of the beam sections and their moments of inertia in the given direction and a criterion by which t, w.sub.1, L.sub.1 and L.sub.s are selected such that resonant frequency and higher harmonic modes of the beam in the given direction are different from the resonant frequency and higher harmonics in any other direction. The transducer may comprise dual beams (31,32) as a double-ended tuning fork with moment decoupling number (45) at the joined end. For each beam comprising a major span of length L.sub.

Abstract: A pressure measurement system comprising a capacitance device whose outer interrelated capacitance plates are maintained in a relatively fixed position relative to one another while an intermediate capacitance plate responds to temperature. The plates are in a restricted enclosure containing a gas dielectric medium. The pressure of the gas dielectric medium (and consequently the density of the gas) is controlled as a function of a pressure to be measured. By measurement of capacitance relationships as a function of the temperature and density of the gas dielectric medium, a pressure measurement is obtained. The system is constructed with like types of materials where the capacitance device is in an enclosure chamber which is immersed in a pressure media. The capacitance device is constructed with a symmetrical arrangement to balance out effects of gravity or vibration. Construction of micro components utilizes an electrostatic bonding system which eliminated arcing during bonding.

Abstract: A measurement transducer with a functionally integral quartz material construction to provide spacing measurement gaps transverse to one another with metallized film surfaces defining capacitance plates and electrically conductive paths. The transducer is mounted under compression independent of a protective case and compensates for temperature changes to provide accurate measurements.

Abstract: A measurement transducer with a functionally integral quartz material construction to provide spacing measurement gaps transverse to one another with metalized film surfaces defining capacitance plates and electrically conductive paths. The transducer is mounted under compression independent of a protective case and compensates for temperature changes to provide accurate measurements.

Abstract: A sensor system utilizing a bourdon tube to generate a force as a function of pressure to deflect a diaphragm in a capacitor device where the diaphragm varies capacitance values of the capacitor device as a function of the applied force. The capacitor device is an essentially integral circularly shaped construction of quartz material in which the diaphragm is attached to a tubular quartz member. A metal member having a similar coefficient of temperature expansion to the coefficient of the quartz is used to couple the diaphragm to the bourdon tube.

Abstract: A sensor system utilizing a Bourdon tube to generate a force as a function of pressure to deflect a diaphragm in a capacitor device where the diaphragm varies capacitance values of the capacitor device as a function of the applied force. The capacitor device is an essentially integral circularly shaped construction of quartz material in which the diaphragm is attached to a tubular quartz member. A metal member having a similar coefficient of temperature expansion to the coefficient of the quartz is used to couple the diaphragm to the Bourdon tube.

Abstract: Downhole well bore pressure sensor capacitances for detecting pressure in a borehole and for developing electrical signals as a function of pressure. FET devices are connected between sensor capacitances and an oscillator where the oscillator is actuated by a sensor capacitance input to switch between pre-set voltage levels. Each sensor capacitance serves to sense a different parameter and the use of FET devices as switches alternately couples the capacitances to the oscillator which produces frequency signals where the frequency of each signal is the representation of the parameter from each capacitance. The FET devices are interconnected so that the stray capacitances and leakage currents inherent in such devices are eliminated by a unity gain amplifier which dynamically balances the potential due to capacitance and current leakage across the various elements of the FET devices.

Abstract: A self-contained, down hole powered electrical system in which a well tool microprocessor and circuitry can be programmed from an external microprocessor and verified as to functional capabilities and data can be retrieved from the tool by use of a current and voltage encoded binary system. Further, the system includes an alarm system for verifying the operation of the tool.

Abstract: A self-contained, down hole powered electrical system in which the tool has nonvolatile memory means which are independent of applied power thereby permitting the power to the system to be turned off between sampling and further including a system for reentering data to nonvolatile memories for retention during high temperature operations.