Method for determining borehole or cavity configuration through

Details Method for determining borehole or cavity configuration through Method for determining borehole or cavity configuration through

1985-06-13

1986-11-25

Myracle, Jerry W.

Measuring and testing

With fluid pressure

Leakage

73149, G01M 304

Patent

active

046241302

ABSTRACT:
A method for determining the erosion of a borehole or cavity by providing a source of liquid inert gas, preferably nitrogen, placing the inert gas in a storage tank, and suspending the storage tank so that one may determine the actual weight of the nitrogen as it is withdrawn from the tank in liquid state. There is further provided hydraulic means for lifting or lowering the storage tank suspended from a weight cell as a tank is placed into use or non-use. Further, the liquid nitrogen is pumped from the storage tank with the use of a reciprocating pump, and converted into gaseous nitrogen (in the state of 100.degree. F.) and is injected into a borehole or the like. The nitrogen gas is then allowed to flow under a certain pressure down the borehole, and due to the properties of nitrogen gas, the nitrogen interfaces at a horizontal plane as it moves down the borehole. Following completion of the nitrogen injection, nitrogen gas could be maintained within the borehole at a constant pressure and any upward movement of the interface over an extended and defined period of time, could determine location and the amount of leakage occurring within the borehole, casing seat or pipe.

REFERENCES:
patent: 1994337 (1935-03-01), Endacott
patent: 2792708 (1957-05-01), Johnston, Jr. et al.
patent: 3049920 (1962-08-01), Allen
patent: 4455869 (1984-06-01), Broussard et al.
Beasley, R. R. Strategic Petroleum Reserve . . . and Analysis, Nov. 30, 1982, Sandia National Labs release 2070, pp. 1-143.

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