Rodger W Schuermann

US Patent:

46946926, Sep 22, 1987

Filed:

Jun 4, 1986

Appl. No.:

6/870343

Inventors:

Gregory D. Brown - Norman OK
Darrel E. Clark - Norman OK
Rodger W. Schuermann - Norman OK

Assignee:

Technical Oil Tools Corporation - Norman OK

International Classification:

G01N 928
E21B 4700

US Classification:

73155

Abstract:

A drilling fluid density measurement system uses a continuously operating bubble measurement system for an oil or gas well. A microprocessor correlates the signal output from a differential pressure transmitter connected to a pair of self-cleaning pressure probes which are positioned in a circulating drilling fluid. By manipulating solenoid valves, the microprocessor controls the intermittent zeroing of the output signal from the differential pressure transmitter and controls a periodic level check to determine if the pressure probes are submerged in the drilling fluid.