Miniature directional indication instrument

• US 6,499,545 B1
• Filed: 07/18/2000
• Issued: 12/31/2002
• Est. Priority Date: 12/18/1997
• Status: Expired due to Fees

• Current Assignee: Alliedsignal Inc.
• Original Assignee: Alliedsignal Inc.
• Inventors: MacGugan, Douglas C.
• Primary Examiner(s): Bagnell, David
• Assistant Examiner(s): Dougherty, Jennifer R.
• Application Number:
  US09/618,339
• Time in Patent Office: 896 Days
• Field of Search: 175/45, 166/255.2, 166/66, 731/524.3, 731/524.8, 731/525.4
• US Class Current: 175/45
• CPC Class Codes: E21B 47/024 of devices in the borehole determining slope or direction of the borehole E21B47/022

Abstract

A well drilling system with a miniature directional indication sensor capable of operating at elevated temperature. The present invention is implemented with power supply, sensor drive and sense circuits in thick film or multi-chip module electronic assemblies, mounted on a chassis with a high resonant frequency. The thick film or multi-chip module electronics assemblies also contribute to increased shock and vibration resistance. Sensor drive and sense functions may be implemented in one or more application specific integrated circuits and integrated with multi-chip module electronics assembly. Analog-to-digital conversion of sensor signals is implemented in a voltage-to-digital converter circuit provided by the present invention. Furthermore, the present invention eliminates data lag between channels by providing simultaneous sampling of all the sensor channels.

Claims

1. A well drilling system comprising a miniature directional indicator, wherein said miniature directional indicator further comprises;

a chassis; and

an electronics module implemented in a ceramic substrate and coupled to said chassis.

2. The well drilling system of claim 1 wherein said miniature directional indicator is operably coupled to a microprocessor, a drill bit and a mud motor.

3. The well drilling system of claim 2, wherein said miniature directional indicator provides a direct digital interface to said microprocessor.

4. The well drilling system of claim 3 wherein said direct digital interface comprises a parallel data bus.

5. The well drilling system of claim 3 wherein said direct digital interface comprises a series data bus.

6. The well drilling system of claim 5 wherein said series data bus provides a two wire interface.

7. The well drilling system of claim 6 wherein said miniature directional indicator includes a third wire for reciprocal communication between said microprocessor and said miniature directional indicator.

8. The well drilling system of claim 1 wherein said electronics module is further implemented in an integrated low temperature co-fired ceramic substrate.

9. The well drilling system of claim 1 further comprising two triads of directional sensors coupled to said electronics module.

10. The well drilling system of claim 9 wherein one of said two triads of directional sensors comprises three linear accelerometers, each of said linear accelerometers substantially enclosed within ceramic packaging.

11. The well drilling system of claim 10 wherein said ceramic packaging further comprises integrated mechanical and electrical signal routing in said accelerometers.