| 摘要 |
This invention relates to an apparatus and a method for collecting debris in a wellbore. The apparatus includes a housing for receiving debris defined by an endless wall portion, first and second end portions, at least the second end portion is provided with at least one closable aperture allowing one-way flow of debris into the housing, a releasable sealing device for holding a volume of a first fluid within the housing, the volume of the first fluid having a lower pressure than ambient wellbore pressure; a retaining device for initially holding the releasable sealing device in a first portion; a releasable sealing device to move from the first position to a second position, whereby debris is entered through the closable aperture into the housing, where volume of first fluid is reduced, at least one conduit defined by an inlet and an outlet, the outlet being in the second end portion being submerged in the debris when the apparatus collects debris, the inlet in fluid communication with a pressurized second fluid contained in a chamber upon release of a valve. |
| 主权项 |
1. An apparatus (200) 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 (202) 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 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 at least one closable aperture (204) into the housing, whereupon said volume of first fluid is reduced; and at least one conduit (223) extending between and through the first and second end portions (202, 203) of the apparatus, the conduit (223) being configured to communicate wellbore fluid from an outside of the first end portion (203) to an outside of the second end portion (202) to equalize any pressure differential between the outside of the first and second end portions (202, 203). |
