Measuring and testing – Borehole or drilling – Downhole test
Patent
1991-06-11
1994-01-04
Williams, Hezron E.
Measuring and testing
Borehole or drilling
Downhole test
166250, 367 83, E21B 4700, G01V 100
Patent
active
052750400
ABSTRACT:
Gas influx into a wellbore, which is commonly referred to as a "kick", is detected during active drilling of the borehole. In a preferred embodiment of the invention a determination of mud pump noise round trip transit time T by evaluating a function T=(n-.PHI./2.pi.)f where .PHI. is the phase between standpipe and annulus signals and f is the frequency of a drill fluid oscillation caused by a mud pump and n is an integer which is incremented or decremented until the rate of change of T with respect to frequency is zero. An alarm signal is generated when the rate of change of T with respect to time exceeds a predetermined threshold. In another embodiment of the invention a determination of the Doppler frequency shift of a mud pump signal expressed as a ratio signal, .DELTA.f/f.sub.0 where .DELTA.f is the change in frequency measured at the annulus from the frequency f.sub.0 of the mud pump signal measured at the standpipe. The ratio is compared with a threshold signal to determine whether or not gas influx has entered the annulus.
REFERENCES:
patent: 2560911 (1951-07-01), Wolf
patent: 2573390 (1951-10-01), Blanchard
patent: 3603145 (1971-09-01), Morris
patent: 3789355 (1974-01-01), patton
patent: 4003256 (1977-01-01), Donelan et al.
patent: 4208906 (1980-06-01), Roberts, Jr.
patent: 4273212 (1981-06-01), Dorr et al.
patent: 4286461 (1981-09-01), Bres et al.
patent: 4299123 (1981-11-01), Dowdy
patent: 4520665 (1985-06-01), Cordier et al.
patent: 4527425 (1985-07-01), Stockton
patent: 4733232 (1988-03-01), Grosso
patent: 4733233 (1988-03-01), Grosso et al.
patent: 4934186 (1990-06-01), McCoy
patent: 5081613 (1992-01-01), Holzhausen et al.
Robert Desbrandes et al., "MWD Monitoring of Gas Kicks Ensures Safer Drilling", Petroleum Engineer International, Jul. 1987.
T. M. Bryant, "MWD Acoustic and Mud Resistivity Measurements for Gas Influx Detection", Teleco Oilfield Services, Inc., 1989.
Anadrill, Inc.
Bush Gary L.
Dombroske George
Kanak Wayne I.
Ryberg John J.
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