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| Clamping circuit |
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| One-piece support and end cover structure for electric motors |
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| Miniature motor |
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| Method for assembling a miniaturized gyromagnetic device |
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| High energy magnetizer/demagnetizer for drill housing |
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Self-contained downhole gauge system
| Details |
Inventors: Anderson, Terry O.; Richardson, J. M.; Penn, Jack C.; Lynch, Michael J.; White, Billy W.; Forehand, Gilbert H.; Duncan, Richard L.; VanBerg, Jr., Charles F.; Tilghman, Stephen E.; Dant, Ronald E.; Donaghe, Charles D.;
Assignee: Halliburton Company (Duncan, OK)
Primary Examiner: Kemeny; Emanuel S.
Assistant Examiner:
Attorney, Agent or Firm: Gilbert, III; E. Harrison, McBurney; Mark E., Walkowski; Joseph A.
In an oil well instrumentation system, the downhole sensor system is controlled by a computer which is powered-on only during sampling movement. An independent circuit, continuously powered, detects significant sensor rate-of-change values whereby the computer-sampling equipment is powered-on. A self-contained memory gauge includes either semiconductor or magnetic core memory for retaining downhole information related to sampled parameters, such as borehole temperature and pressure. A microprocessor-based computer manages the power utilization by independently and selectably energizing and deenergizing different sections of the gauge. The magnetic core memory is tested for operability, and the addressing of the magnetic core memory is adjusted in accordance with any inoperable memory locations. Samples of the monitored environmental conditions can be taken at variable rates dependent upon software monitoring of the condition, the remaining battery life and the remaining memory capacity and in response to hardware monitored pressure changes. Each sample can be taken to a selectable resolution. A watchdog circuit monitors the microprocessor to insure that it is operating within a preselected time limit. |
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DETAILED DESCRIPTION The present invention overcomes the above-noted and other shortcomings of the prior art by providing a novel and improved self-contained downhole gauge system.
The self-contained downhole gauge system of the present invention includes both software and hardware monitoring of changes in the sampled parameter or condition.
The software control is also responsive to remaining battery life and memory capacity.
The present invention utilizes a plurality of transducer interface means so that any of several commercially available transducers having different outputs can be interfaced to the remainder of the present invention.
The present invention also utilizes a selectable one of a semiconductor memory or a magnetic core memory, which magnetic core memory is tested for inoperable locations and is addressed bit-by-bit.
The present invention also includes a plurality of different electronic circuits which can be separately or independently powered up and powered down to conserve the internal power supply.
The present invention also includes means by which different resolutions can be selected dependent upon correspondingly selected sample rates.
A watchdog circuit is also included to oversee the operation of the microprocessor to insure that it is operating within a selectable timing period.
The present invention described herein includes a housing having three sections linearly and releasably interconnected.
The invention also includes a selectable one of a plurality of transducer interface means, connected to one or more transducers which detect the environmental conditions to be monitored, for converting the type of output received from the respective transducers into respective electrical signals having a predetermined format regardless of the transducers used.
In the preferred embodiment this format includes a characteristic such as frequency corresponding to the magnitude of the sampled parameter.
The selected one of the plurality of transducer interface means is disposed in a first section of the housing
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Generators or Motors 
