Communications: electrical – Continuously variable indicating – With meter reading
Patent
1986-12-01
1988-03-22
Kyle, Deborah L.
Communications: electrical
Continuously variable indicating
With meter reading
367 82, 367 83, 73155, 175 48, 324324, G01V 100, H04H 900, B21B 4700
Patent
active
047332336
ABSTRACT:
The infusion of fluid from the formation being drilled into a borehole is detected in an MWD system by modulating the drilling fluid stream in the drill pipe and detecting pressure variations commensurate with the modulation at the surface in the annulus between the drill pipe and wall of the well. Modulation to generate the pressure variations in the annulus is accomplished by the same pressure generating element used to generate pressure signals in the mud column for MWD measurements. The detected pressure variations are compared in phase and/or amplitude with their own near term past history or with the drilling fluid pressure variations in the drill pipe resulting from the modulation. Variations in phase or amplitude which can not be attributed to changes in the drilling operation will be indicative of fluid infusion.
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Oppenheim et al., Digital Signal Processing, Prentice Hall, 1975, pp. 376-395.
Feeley, Jr. G. Robert
Grosso Donald S.
Kyle Deborah L.
Steinberger Brian J.
Teleco Oilfield Services Inc.
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