Measuring and testing – Borehole or drilling – During drilling
Reexamination Certificate
1999-12-12
2001-04-17
Williams, Hezron (Department: 2856)
Measuring and testing
Borehole or drilling
During drilling
C073S152010, C073S152520, C175S045000, C166S250010, C166S250160
Reexamination Certificate
active
06216533
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to devices and tools for the measurement of downhole environmental parameters during oil and gas drilling operations. The present invention relates more specifically to a downhole drilling efficiency sensor for use with oil and gas drilling operations that accurately measures drilling parameters at or near the drill bit in order to increase the effectiveness and productivity of the drilling operation.
2. Description of the Related Art
U.S. Pat. No. 4,662,458 issued to Ho entitled Method and Apparatus for Bottom Hole Measurement and commonly assigned with the present application describes a downhole tool with strain gauges and includes measurements for weight-on-bit (WOB), torque-on-bit (TOB), bending-on-bit (BOB), and side forces.
U.S. Pat. Nos. 4,821,563 and 4,958,517, both issued to Maron and both entitled Apparatus for Measuring Weight, Torque, and Side Force on a Drill Bit, each describe an apparatus that includes strain gages located in radial holes in the wall of the drill collar sub. The strain gages are position in a non-symmetrical arrangement.
U.S. Pat. No. 5,386,724 issued to Das et al. entitled Load Cells for Sensing Weight and Torque on a Drill Bit While Drilling a Well Bore also describes the use of an array of load cells made up of strain gages for measuring weight and torque parameters. The Das et al. disclosure includes a recent review of the relevant art and a description of selected methods for calculating strain using strain gages of the type employed herein and is therefore cited and incorporated by reference herein in its entirety.
SUMMARY OF THE PRESENT INVENTION
The present invention provides a downhole drilling efficiency sensor (DES) apparatus for use with drilling operations in oil and gas exploration, that accurately measures important drilling parameters at or near the drill bit in order to increase the effectiveness and productivity of the drilling operation. The parameters measured include weight-on-bit (WOB), torque-on-bit (TOB), bending-on-bit (BOB), annulus pressure, internal bore pressure, triaxial vibration (DDS—Drilling Dynamics Sensor) annulus temperature, load cell temperature, and drill collar inside diameter temperature. The direction of the bending-on-bit measurement is also determined with respect to the low side of the hole while rotating (or stationary) by using a triaxial vibration sensor and magnetometer array.
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Jones Dale A.
Woloson Scott E.
Cox & Smith Incorporated
Dresser Industries Inc.
Wiggins David J.
Williams Hezron
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