| 摘要 |
A method of isolating annular areas formed by multiple well casings can include providing fluid communication through a wall of one of the casings at a location where another one of the casings outwardly surrounds the first casing, then flowing a cement into an annulus formed radially between the first and second casings, then providing fluid communication through the wall of the first casing and a wall of the second casing, and then flowing another cement into another annulus external to the second casing. A method of abandoning a well can include perforating a casing at a location where another casing outwardly surrounds the first casing, flowing a cement into an annulus formed radially between the first and second casings, the cement including a tracer, perforating the first and second casings, and flowing another cement into another annulus external to the second casing, the second cement including a second tracer.
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