Patent ID: 8453724
Filing Date: 2013-06-04
Classification: E21B

Abstract:
1. A wellbore cleanout tool for recovering objects and debris from a well having a wellbore hole having a casing which comprises: a) an elongated generally cylindrical body member having an inner wall surface and dimensioned to be positioned within the casing and defining an inner space for reception of objects to be recovered from the wellbore of the well, said body member having a generally inwardly tapered outer wall portion at an upper end thereof, said tapered outer wall portion having a plurality of upwardly directed apertures extending therethrough which communicate with said inner space; b) an elongated tubular member defining a generally longitudinal axis, said elongated tubular body member being positioned inside said elongated generally cylindrical body member and attached thereto, said elongated tubular.member extending below a lower end of said generally cylindrical body member, and having a diameter less than an inner diameter of said generally cylindrical body member so as to define an annular space therebetween, said elongated tubular member having a closed lowermost end, and being adapted to receive pressurized flushing liquid at an upper end thereof, said elongated tubular member further having a plurality of generally upwardly extending apertures adjacent said closed lowermost end and extending through a wall portion of said elongated tubular member, said apertures being oriented at a generally acute angle relative to said longitudinal axis, said apertures positioned and oriented for directing the flushing liquid radially outwardly and upwardly of said elongated tubular member toward said annular space between said generally cylindrical body member and said inner elongated tubular member, said flushing liquid having a velocity sufficient to direct objects and debris from the wellbore into said annular space; c) a multiple-section gate positioned within said elongated generally cylindrical body member and attached to an inner wall surface of said generally cylindrical body member adjacent a lower end portion thereof, each said section of said gate being pivotally mounted and spring biased to pivot inwardly and downwardly toward generally radial closed positions which blocks the lower end of said generally cylindrical body member, each said gate section being capable of upward pivotal movement by force provided by the upward movement of the flushing liquid when exiting said apertures in said elongated tubular member and being directed toward said gate in said generally cylindrical body member; and d) means positioned adjacent said apertures in said tapered wall portion at the upper end of said generally cylindrical body member to filter the upwardly directed liquid to separate debris and other objects therefrom for containment within said generally cylindrical body member prior to the liquid exiting said generally cylindrical body member through said apertures in said upper tapered wall portion of said generally cylindrical body member.