Wireline well abandonment tool

Abstract

A well abandonment tool comprising an elongate housing extending between top and bottom ends locatable within a wellbore having a longitudinal pumping cylindrical bore therein. The apparatus further comprises a wellbore seal located around the housing operable to engage upon the wellbore and to be expanded into contact therewith upon an upward motion of the housing so as to seal an annulus between the housing and the wellbore and a bridge plug engagement connector adapted to secure a bridge plug thereto at a position below the bottom end of the housing. The apparatus further includes a pumping piston longitudinally moveably located within the pumping cylinder, the pumping piston being suspended from a wireline wherein longitudinal movement of the pumping piston discharges a fluid into a bridge plug activation chamber having a movable cylinder adapted to draw the bridge plug engagement connector against the bottom end of the housing so as to expand the bridge plug into engagement with the wellbore. A method for abandoning a wellbore comprising locating a housing within a wellbore above a location to be sealed, pulling upwardly on a wireline secured to a pumping piston within the housing so as to draw a bottom end of the housing upwards thereby extending a seal element located along the housing into engagement with the wellbore, pulling upwardly on the wireline so as to displace the pumping piston within a cylindrical bore within the housing so as to discharge a fluid therefrom and directing the discharged fluid into a bridge plug activation chamber adapted to draw a bridge plug engagement connector against a bottom end of the housing so as to expand a bridge plug secured thereon into engagement with the wellbore.

What is claimed is: 
     
         1 . A well abandonment tool comprising:
 an elongate housing extending between top and bottom ends locatable within a wellbore having a longitudinal pumping cylindrical bore therein;   a wellbore seal located around said housing operable to engage upon said wellbore and to be expanded into contact therewith upon an upward motion of said housing so as to seal an annulus between said housing and said wellbore;   a bridge plug engagement connector adapted to secure a bridge plug thereto at a position below said bottom end of said housing; and   a pumping piston longitudinally moveably located within said pumping cylinder, said pumping piston being suspended from a wireline wherein longitudinal movement of said pumping piston discharges a fluid into a bridge plug activation chamber having a movable cylinder adapted to draw said bridge plug engagement connector against said bottom end of said housing so as to expand said bridge plug into engagement with said wellbore.   
     
     
         2 . The well abandonment tool of  claim 1  wherein said bridge plug engagement connector includes a frangible portion and wherein said bridge plug engagement connector includes a cavity therein through said frangible portion in fluidic communication with said bridge plug activation chamber. 
     
     
         3 . The well abandonment tool of  claim 2  further comprising at least one valve adapted to selectably direct said fluid from said pumping cylinder to said bridge plug activation chamber. 
     
     
         4 . The well abandonment tool of  claim 3  wherein said at least one valve is adapted to isolate said fluid within said pumping cylinder so as to prevent movement of said pumping piston therein. 
     
     
         5 . The well abandonment tool of  claim 3  further comprising a testing fluid injector assembly adapted to discharge a quantity of a testing fluid therefrom into a pressurized annulus between said housing and said wellbore and between said wellbore seal and said bridge plug. 
     
     
         6 . The well abandonment tool of  claim 5  wherein said testing fluid injector comprises an injector cylinder having an injector piston therein and a reservoir cylinder having a reservoir piston therein. 
     
     
         7 . The well abandonment tool of  claim 6  wherein said reservoir piston is displaced by said fluid directed to said bridge plug activation chamber so as to pressurize said injector cylinder. 
     
     
         8 . The well abandonment tool of  claim 6  wherein said at least one valve is adapted to selectably direct said fluid to said injector piston so as to displace said piston therein so as to discharge said testing fluid therefrom. 
     
     
         9 . The well abandonment tool of  claim 8  wherein said injector cylinder includes a check valve having an opening pressure selected to prevent said discharge of said testing fluid before said bridge plug is set. 
     
     
         10 . The well abandonment tool of  claim 3  further comprising a processing circuit adapted to control said operation of said at least one valve. 
     
     
         11 . The well abandonment tool of  claim 10  wherein said processing circuit is adapted to monitor said pressure within said pressurized annulus and presence of said testing fluid at said test sensors thereabove. 
     
     
         12 . The well abandonment tool of  claim 1  wherein said pumping piston includes a first stage ring selectably secured therearound so as to provide an increased pumping volume when secured thereto. 
     
     
         13 . The well abandonment tool of  claim 12  wherein said first stage ring includes a plurality of piston collet arms each having a radially inwardly extending protrusion engaged within an annular piston groove on said pumping piston so as to secure said second stage ring to said pumping piston. 
     
     
         14 . The well abandonment tool of  claim 13  wherein said each of said pumping piston collet arms includes a radially outwardly extending protrusion adapted to be engaged within an annular cylinder groove in said pumping cylinder. 
     
     
         15 . The well abandonment tool of  claim 14  further comprising a first stage disengagement wedge ring adapted to be slidably located under said plurality of piston collet arms so as to disengage said inwardly extending protrusions from said annular piston groove and engage said outwardly extending protrusions into said annular cylinder groove. 
     
     
         16 . The well abandonment tool of  claim 15  further comprising at least one spring biased second stage piston fluidically connected with said output form said pumping cylinder so as to displace said first stage disengagement wedge ring upon said pumping cylinder reading a predetermined pressure. 
     
     
         17 . The well abandonment tool of  claim 1  further comprising a plurality of slip arms expandable into engagement with said wellbore wall by a cone located around said housing between said slip arms and said wellbore seal. 
     
     
         18 . The well abandonment tool of  claim 17  wherein said slip arms are retained around said housing on a slip arm ring. 
     
     
         19 . The well abandonment tool of  claim 18  wherein said slip arm ring includes at least one radially inwardly extending j-pin, wherein said slip arm ring is selectably longitudinally positionable along said housing by rotating said j-pin into alternating short and long longitudinal slots on an outer surface of said housing. 
     
     
         20 . The well abandonment tool of  claim 17  wherein said wellbore seal is longitudinally compressed between said cone and a wellbore seal backing protrusion extending from said housing. 
     
     
         21 . The well abandonment tool of  claim 20  further comprising a wellbore seal retention piston engaged upon a bottom end of said wellbore seal wherein said wellbore retention piston is biased towards said wellbore seal by said pressure of said fluid directed towards said bridge plug engagement chamber. 
     
     
         22 . A method for abandoning a wellbore comprising:
 locating a housing within a wellbore above a location to be sealed;   pulling upwardly on a wireline secured to a pumping piston within said housing so as to draw a bottom end of said housing upwards thereby extending a seal element located along said housing into engagement with said wellbore;   pulling upwardly on said wireline so as to displace said pumping piston within a cylindrical bore within said housing so as to discharge a fluid therefrom;   directing said discharged fluid into a bridge plug activation chamber adapted to draw a bridge plug engagement connector against a bottom end of said housing so as to expand a bridge plug secured thereon into engagement with said wellbore.   
     
     
         23 . The method of  claim 22  further comprising further pressurizing said bridge plug activation chamber after said bridge plug is secured so as to shear a frangible portion of said bride plug engagement connector releasing said fluid into a pressurized annulus between said housing and said wellbore between said seal and said bridge plug. 
     
     
         24 . The method of  claim 22  further comprising injecting a quantity of a testing fluid into said pressurized annulus and monitoring above said seal for a presence of said testing fluid. 
     
     
         25 . The method of  claim 24  further comprising monitoring a pressure within said pressurized annulus.