| 摘要 |
Apparatus and method for detecting leaks in packers around casings in oil wells. A coiled tubing (2) carries a sectioned container (3) with doses of emulsifiable tracer fluid (9), a set of double packers (4) for internal sealing between the casing (1) and the coiled tubing, and a detector (6). This is lowered, with the oil flow (7) stopped, to the zone-isolating packers (5A, 5B), where the coiled tubing's packers (4) are expanded. Production flow (7) is then started, and a pressure-controlled force (8) expels a dose of tracer fluid (9) from container (3) into the oil flow from the reservoir. If there is leakage past the lowest packer (5A), the tracer fluid (9) will be sucked round and past it and follow the oil flow (7) past a detector (6) which reveals any leakage. The second lowest packer (5B) is then tested and so on. The tracer fluid (9) contains dyes, ion-bearing metallic salts or chips, radioactive fragments, and/or gases.
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