Ultrasensitive apparatus and method for detecting change in flui

Details Ultrasensitive apparatus and method for detecting change in flui Ultrasensitive apparatus and method for detecting change in flui

1980-09-05

1984-11-06

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 43, 417 53, F04B 4902, F04B 4906, F04B 4900

Patent

active

044809603

ABSTRACT:
Transient change in heat flux due to ultrasmall variation in flow conditions, say from flow-to-no flow within a flowline of a wellhead connected to an oil well penetrating an earth formation, is surprisingly useful in pinpointing the occurrence of adverse "pump pounding" during the production cycle of the well. In one respect, the change in flux is monitored within each flowline using a heat flux transducer/meter in series with a pump controller. Cascading the signal output, i.e. serially combining the outputs of N thermocouples the transducer/meter, enhances sensitivity. In a preferred case, N is about 80 but can be as high as 320, if desired.

REFERENCES:
patent: 2729976 (1956-01-01), Laub
patent: 3073244 (1963-01-01), Elliot et al.
patent: 3091179 (1963-05-01), Echols
patent: 3269320 (1966-08-01), Tilley et al.
patent: 3724267 (1973-04-01), Zoschak
patent: 3821726 (1974-06-01), Chang et al.
patent: 4197738 (1980-04-01), Degenue

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