| 摘要 |
Oilfield wells lined with tubular steel casing are periodically filled with water and pressure tested to assess whether the casing is leaking. The present invention involves landing a charge of water-soluble, molten eutectic salt mixture at a predetermined depth where it will solidify due to temperature reduction. The mixture expands as it cools and seals against the casing. It forms a solid plug bridging across the casing bore. The plug may be used in connection with pressure testing the casing above it. The plug will eventually dissolve in water to allow regular production to resume.
|
