Method for processing echo sounding data collected from borehole

Details Method for processing echo sounding data collected from borehole Method for processing echo sounding data collected from borehole

1990-07-16

1993-04-06

Envall, Jr., Roy N.

Boots, shoes, and leggings

73151, G01V 100

Patent

active

052008940

ABSTRACT:
An echo sounding system includes an acoustic gun which is mounted to the wellhead of a borehole. The acoustic gun produces an acoustic pulse which is transmitted down the borehole. A tubing string is installed in the borehole and it has substantially evenly spaced collars. Fluid is pumped from the borehole, or well, by use of a reciprocating pump driven by a pump rod extending to the surface. The acoustic pulse produces reflections when it strikes the tubing collars and the surface of the fluid. A microphone detects the reflections to produce a return signal. This signal is digitized and stored. The digitized signal is processed to detect the rate of the collar reflections and the stored signal is narrowband filtered with a passband filter centered at the rate of receipt of the collars. Each cycle of the narrowband filtered signal corresponds to one collar reflection. In this signal, each cycle is counted, and extrapolation used when necessary to produce a collar count extending from the surface to the liquid surface. This is multiplied by the average joint length to produce the depth to the liquid surface. The system further detects the liquid level and displays it as a marker on the data signal. An operator can use the automatically determined marker or move it to another position. Finally, the operator is provided with optimum operating parameters for achieving maximum production from the well.

REFERENCES:
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patent: 4318298 (1982-03-01), Godbey et al.
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patent: 4661932 (1987-04-01), Howard et al.
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patent: 4853901 (1989-08-01), Barber
Halliburton "Echo-Meter" Brochure and Operating Manual, Halliburton Oil Well Cementing Company.

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