Method of leak testing an underground fluid-storage cavity

Details Method of leak testing an underground fluid-storage cavity Method of leak testing an underground fluid-storage cavity

1997-04-21

1999-04-06

Williams, Hezron

Measuring and testing

Borehole or drilling

Pressure measurement

73149, 73 492, 405 53, E21B 4900, G01F 1700

Patent

active

058921486

ABSTRACT:
The method comprising measuring the rate at which working fluid is expelled from a cavity through a central tubing to a well head under atmospheric pressure at the well head; determining the shape of a zone of the well selected for positioning an interface between a test fluid and the working fluid; performing temperature measurements and pressure measurements over the full height of a cavity under atmospheric pressure at the well head; injecting additional working fluid into the central tubing or into the annular space until a predetermined test pressure is reached; measuring the compressibility of a cavity during the preceding step; injecting test fluid into the annular; measuring the depth of the interface between the test fluid and the working fluid for a first time at the end of injecting test fluid; measuring the test fluid and the working fluid pressures at the well head; measuring the level of the interface between the test fluid and the working fluid for a second time; and evaluating the real leakage rate of test fluid that took place during said test period.

REFERENCES:
patent: 4455869 (1984-06-01), Broussard et al.
patent: 4523453 (1985-06-01), Faul et al.
patent: 4620439 (1986-11-01), Faul et al.
patent: 4624130 (1986-11-01), Faul et al.
patent: 4720995 (1988-01-01), Thiel
patent: 4976142 (1990-12-01), Perales

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