| 摘要 |
The present invention relates to an apparatus (200) and a method for collecting debris (111) in a wellbore, the apparatus comprising : - a housing (201, 202, 203) for receiving debris (111), the housing (201, 202, 203) being defined by an endless wall portion (201), a first end portion (203) and a second end portion (202), at least the second end portion (20) being provided with at least one closable aperture (204) allowing one-way flow of debris into the housing; - a releasable sealing device (209) for holding a volume of a first fluid within the housing (201, 202, 203), the volume of the first fluid having a lower pressure than the ambient wellbore pressure; - a retaining device (212, 213) for initially holding the releasable sealing device (209) in a first position; - a release mechanism (214, 215) for operating the retaining device (212, 213) in a manner allowing the releasable sealing device (209) to move from the first position to a second position, whereby debris is entered through the closable aperture (204) into the housing, whereupon said volume of first fluid is reduced. The apparatus is further provided with : at least one conduit (223) defined by an inlet and an outlet, the outlet being in the second end portion (202) being submerged in the debris (111) when the apparatus (200) is in a position for collecting debris (111), the inlet being in fluid communication with a pressurised second fluid contained in a chamber (2601) upon release of a valve (2602); or at least one conduit (223) defined by an inlet and an outlet, the outlet being in the second end portion (202) being submerged in the debris (111) when the apparatus (200) is in a position for collecting debris (111), the inlet being in fluid communication with a pressurised second fluid contained in a chamber (2601) upon release of a valve (2602). |
