Pressure monitoring technique and applications involving wells

Details Pressure monitoring technique and applications involving wells Pressure monitoring technique and applications involving wells

2005-06-28

2005-06-28

Larkin, Daniel S. (Department: 2856)

Measuring and testing

Borehole or drilling

Pressure measurement

C073S001710

Reexamination Certificate

active

06910375

ABSTRACT:
The outlet pressure of a pump that fluctuates rapidly, as is typical of high pressure multiplex pumps, is sensed in a pressure line leading from the main flow line to a damping mechanism. The damping mechanism comprises a pair of small spaced openings, which are preferably adjustable in size. The damping mechanism is ideally a pair of needle valves placed in series so the pressure downstream of the second needle valve fluctuates considerably less than upstream of the first needle valve. The damped pressure is sensed to provide an input to real time graphs showing various pertinent pressure measurements involving the application of pressure, e.g. to monitor downhole tools in hydrocarbon wells. The downhole tools may be fluid driven motors, whipstocks, packers, wiper plugs and the like. In the case of fluid driven or mud motors, a base line pressure taken when the motor is idling is compared to the pressure when the motor is drilling to detect the onset of motor stall.

REFERENCES:
patent: 3749185 (1973-07-01), Tiraspolsky et al.
patent: 4297880 (1981-11-01), Berger
patent: 6109367 (2000-08-01), Bischel et al.
patent: 6421298 (2002-07-01), Beattie et al.
Versa Gauge Publication from www.versagauge.com Describing a Pressure Snubber.
BSI Controls Publication from www.bucksales.com Describing a Pressure Snubber.
O'Keefe Controls Co. Publication from www.okcc.com Describing a Pressure Snubber.
Ray Pressure Snubber Publication from www.raysnubber.com Describing a Pressure Snubber.

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