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    • 4. 发明专利
    • Method and apparatus for preventing down hole tools from accidentally falling into a well bore during their attempted removal
    • GB2354540A
    • 2001-03-28
    • GB0023209
    • 2000-09-21
    • BAKER HUGHES INC
    • KAISER GARRY R
    • E21B33/06E21B41/00
    • A method used to prevent the accidental dropping of a down hole tool into a well bore involves arranging a blow out prevention device so that it prevents the tool, which is being removed through it, from falling down hole. The method may involve providing a pair of opposing ram blocks [10], each having a semi-circular opening [12], which are pushed together to form a bore [14]. There may be a number of slips [18] which are able to move up and down on guide posts [20] in recesses [16] of the ram blocks [10], and the slips [18] may be downwardly biassed towards the lower surface [24] of the recesses [16] by springs. The recesses [16] may have tapered surfaces [26] to match tapered surfaces [28] on the slips [18] and be arranged so that upward movement of the slips [18] causes them to move away from the centre of the bore [14]. A tool being pulled out of a well through the bore [14] may be brought into contact with the slips [18]. This then places an upwards force on the slips [18] which moves them upwardly and outwardly, against the bias, allowing the tool to pass through them. If the tool is then accidentally released, the upwards force stops and the downwards bias forces the slips [18] down the tapered surfaces [26] of the recesses [16]. As they move downwards, the slips [18] are forced towards the tool by the tapered surfaces [26], and the serrations [30] bite into the tool and prevent it from falling.