Measuring and testing – With fluid pressure – Leakage
Patent
1995-09-13
1996-10-08
Williams, Hezron E.
Measuring and testing
With fluid pressure
Leakage
73 407, G01M 308
Patent
active
055633366
ABSTRACT:
An apparatus for pressure testing of tubulars. The apparatus comprises a tester body having multiple spaced-apart external circumferential seal elements expansible by piston movement; a seal gas saver valve connected to the tester body; and a pressurized seal and test gas source to supply gas to the tester. The tester body is inserted into a tubular so that the seal elements are astride a desired test area, typically a tubular connection. Seal gas pressure is then applied to move the pistons and expand the seal elements against the tubular wall, forming a test chamber. Test gas is then introduced into the chamber to achieve a desired pressure, and external containment and sensing means are used to detect any escape of test gas, thereby showing a leak. When the test is complete, the test gas pressure is released, and the seal gas pressure is reduced, with the seal gas flowing back into a reclamation tank. When a desired seal gas retention pressure is reached, the seal gas saver valve closes, maintaining the pressure in the seal gas supply line and venting the small remaining seal gas volume in the tester body. Damage to the tester seal elements by excessive piston travel is prevented by positive piston stop means on the tool.
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Lambert Jesse D.
Politzer Jay L.
Williams Hezron E.
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