| 摘要 |
A method for cleanout of particulate matter for an oil well having a production casing, an inner production tubing and pumping means connected to a continuous steel rod mounted on a co-rod rig, comprises the steps of withdrawal of the pumping means to the land surface, the connection to said rod of a cleanout tool of predetermined length, the insertion of said tool into said production tubing and substantially simultaneous pumping of a cleanout fluid through said production tubing, said fluid is thereby forced through perforations in said tool and downwards to particulate matter in a lower portion of said production tubing, and thence upwards with said matter in an annulus within said production casing and surrounding said production tubing. The method includes provision for the reverse flow of the cleaning fluid. A tool for said cleanout method comprises a perforated tubular upper section, a central tubular section to which is attached at least one pack-off means to restrict fluid circulation within said production tubing adjacent the outside of said tool, and a lower tubular section, said tubular sections having an external diameter less than the internal diameter of said production tuning.
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