Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent
1991-02-08
1992-11-10
Steinberger, Brian S.
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through well fluids
73155, 166337, 175 48, G01V 136
Patent
active
051630290
ABSTRACT:
In accordance with the present invention, several methods are presented for the detection of gas into an offshore marine riser (e.g., riser gas). In a first embodiment of this invention, an acoustic transmitter is positioned on or nearby the subsea blowout preventor stack and imparts continuous low frequency waves into the annular fluid in the marine riser. These imparted waves define pressure perturbations which are received by a pressure transducer positioned on the riser at a location above the acoustic transmitter. Gas detection in the riser is then indicated by determining the rate of change of certain characteristics of the output. The output characteristics are preferably the moduli and phase angles of the acoustic fundamentals and their harmonics. In a second embodiment of this invention, continuous or pulsed pressure waves are imparted into the marine riser using a transducer ring surrounding the riser comprised of piezoelectric or magnetostrictive elements which change shape when electrically stimulated. When such electrical stimulation occurs, preferably by a pulse containing multiple harmonics, the transducer rings impacts the riser pipe causing compressional waves to be set up in the annular fluid. The compressional waves are then sensed at or near the surface and changes in amplitude or phase shift are detected for determining the presence of influx gas.
REFERENCES:
patent: 2232476 (1941-02-01), Ritzmann
patent: 2560911 (1951-07-01), Wolf
patent: 2573390 (1951-10-01), Blanchard
patent: 3100023 (1963-08-01), Clements
patent: 3100994 (1963-08-01), Junger
patent: 3208349 (1965-09-01), Burnett et al.
patent: 3316997 (1967-05-01), McNog
patent: 3760891 (1973-09-01), Gadbois
patent: 3821726 (1974-06-01), Chang et al.
patent: 3865201 (1975-02-01), Haden
patent: 3900827 (1975-08-01), Lamel
patent: 3906435 (1975-09-01), Lamel et al.
patent: 3910110 (1975-10-01), Jefferies et al.
patent: 3961308 (1976-06-01), Parker
patent: 4147222 (1979-04-01), Patten et al.
patent: 4273212 (1981-06-01), Dorr et al.
patent: 4590593 (1986-05-01), Rodney
patent: 4733232 (1988-03-01), Grosso
patent: 4733233 (1988-03-01), Grosso et al.
patent: 4964085 (1990-10-01), Coope et al.
patent: 5006845 (1991-04-01), Calcar et al.
Bryant Thomas
Grosso Donald S.
Hay Arthur
Steinberger Brian S.
Teleco Oilfield Services Inc.
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