| 摘要 |
The present invention regards a method and an apparatus for retrieving a tubing (1201) from a well (100) at least partly filled with a liquid (1101), the tubing (1201) having a first end portion (A-A') and a second end portion (B-B'), wherein the method comprising the steps of: - running a retrieval apparatus (1401) using a connecting means (507, 2301, 2401) from a surface and into the well (100), the retrieval apparatus (1401) comprising: - an engagement means (1401) for engaging the tubing (1201); - a sealing means (1404) for sealing a portion of the bore of the tubing (1201); - injection means for injecting a low density fluid into the tubing (1201), - connecting the engagement means (1401) to a portion of the tubing (1201); - activating the sealing means (1404) to close liquid communication in the bore of the tubing between the first end portion (A-A') and the second end portion (B-B'); - replacing at least a portion of a volume of liquid (1101) defined by the sealing means (1404), the tubing (1201) and the second end portion (B-B') of the tubing (1201) by a low density fluid (1501) introduced in said volume by the injection means; and - retrieving the tubing (1201) out of the well (100) using the connecting means (507, 2301, 2401). |
