A drill pipe string conveyed bridge plug running tool and a method for forming and verifying a cement plug

Abstract

A method of forming and verifying a cement plug in a single run in a casing bore, includes: assembling a bridge plug on a drill-pipe string conveyed through-bore bridge plug running tool, the bridge plug running tool including a cementing stinger portion releasably connected to an upper part of the bridge plug, the bridge plug running tool including dress-cutting wings arranged about a base of said cementing stinger portion; running into a well the bridge plug on the running tool to a target depth; setting the bridge plug in the casing; pulling up on the drill pipe string to disconnect the stinger portion from the bridge plug; using the stinger portion, circulating in cement slurry on top of said bridge plug to form a cement plug in the casing; allowing the cement plug to set and harden; using the running tool dressing a top of the cement plug; and using the running tool tagging the dressed cement plug to verify its quality.

1 .- 14 . (canceled) 
     
     
         15 . A drill pipe string conveyed bridge plug running tool comprising:
 an axially extending mandrel with an upper connection to a drill pipe string and provided with a through bore,   wherein said through bore extends to a lower portion of said mandrel and continues into a cylindrical sleeve-shaped stinger portion,   wherein said cylindrical sleeve-shaped stinger portion is arranged for being releasably connected by shear screws into a main bore of a J-slot top stinger of a bridge plug arranged for being set in a casing,   wherein said cylindrical sleeve-shaped stinger portion is arranged for being released from said bridge plug by shearing said shear screws and for depositing cement slurry to make a cement plug on top of said bridge plug,   wherein said mandrel has two or more radially extending dress-cutter blades arranged for dress-cutting into a top of said cement plug,   wherein said dress-cutter blades are provided with two or more dress-cutter edges extending radially beyond said cylindrical sleeve-shaped stinger portion and are arranged for cutting axially into the top of said cement plug,   wherein said dress-cutter blades and said cylindrical sleeve-shaped stinger portion are arranged for tagging the resulting dressed cement plug top surface, and   wherein circulation ports are arranged in said cylindrical sleeve shaped stinger portion, said circulation ports arranged for being covered by said J-slot top stinger before shear screws are sheared, and for being uncovered when said shear screws are sheared out by pulling off from said J-slot top stinger.   
     
     
         16 . The drill pipe string conveyed bridge plug running tool according to  claim 15 , wherein said dress-cutter edges are generally axial-transverse to a tool axis so as for when dressing axially into said deposited cement plug forming a transverse, plane surface to be tagged. 
     
     
         17 . The drill pipe string conveyed bridge plug running tool according to  claim 15 , wherein the dress-cutter blades are arranged for spanning a significant portion of an interior diameter of said casing. 
     
     
         18 . The drill pipe string conveyed bridge plug running tool according to  claim 15 , wherein said cylindrical sleeve-shaped stinger portion is provided with a transversely arranged front cutter blade having a cutting width corresponding to an outside diameter of said cylindrical sleeve-shaped stinger portion. 
     
     
         19 . The drill pipe string conveyed bridge plug running tool according to  claim 15 , wherein said dress-cutter blades have a part-helical shape about said mandrel. 
     
     
         20 . The drill pipe string conveyed bridge plug running tool according to  claim 15 , wherein said dress-cutter blades have an axial-parallel directed, radial straight shape about said mandrel. 
     
     
         21 . The drill pipe string conveyed bridge plug running tool according to  claim 15 , wherein a slot is formed for each of said dress-cutter blades, said slots cut into the top of said J-slot top stinger. 
     
     
         22 . The drill pipe string conveyed bridge plug running tool according to  claim 15 , wherein a circulation sub is arranged below said J-slot top stinger of said bridge plug. 
     
     
         23 . The drill pipe string conveyed bridge plug running tool according to  claim 22 , wherein said circulation sub is a blind circulation sub. 
     
     
         24 . The drill pipe string conveyed bridge plug running tool according to  claim 15 , wherein no circulation sub is arranged below said J-slot top stinger, and said J-slot top stinger is further connected to said bridge plug with a valve in a through bore, said valve, such as a ball valve, arranged for being open after said bridge plug has been set, pressure test from below is conducted, and said valve arranged for being closed before disconnecting said cylindrical sleeve-shaped stinger portion from said J-slot top stinger, and before cementing starts. 
     
     
         25 . The drill pipe string conveyed bridge plug running tool according to  claim 15 , wherein no circulation sub is arranged below said J-slot top stinger, and said J-slot top stinger is further connected to said bridge plug with a through bore, said J-slot top stinger provided with a with a valve in its through bore, said valve arranged for being open after said bridge plug has been set, pressure test from below is conducted, and said valve arranged for being closed before disconnecting said cylindrical sleeve-shaped stinger portion from said J-slot top stinger, and before cementing starts. 
     
     
         26 . The drill pipe string conveyed bridge plug running tool according to  claim 15 , wherein said running tool comprises a burst disc arranged in a passage from said through bore radially to an outside face of the tool mandrel. 
     
     
         27 . A method of forming and verifying a cement plug in a single run in a casing bore, comprising the steps of:
 assembling a bridge plug on a drill-pipe string conveyed through-bore bridge plug running tool, said bridge plug having a through bore and being provided with a valve,   wherein said bridge plug running tool comprises a cylindrical sleeve-shaped stinger portion releasably connected by shear screws into a main bore of a J-slot top stinger on an upper part of a bridge plug,   wherein said bridge plug running tool further comprises dress-cutting blades arranged about a base of said cementing cylindrical sleeve-shaped stinger portion;   running into a well said bridge plug on said running tool to a target depth;   setting said bridge plug in the casing;   pulling up on said drill pipe string to disconnect said stinger portion from said bridge plug;   using said cylindrical sleeve-shaped stinger portion, circulating in cement slurry on top of said bridge plug to form a cement plug in said casing;   allowing said cement plug to set and harden;   using said running tool dressing a top of said cement plug; and   using said running tool tagging said dressed cement plug to verify a quality of said dressed cement plug.   
     
     
         28 . The method according to  claim 27 , comprising the further steps of:
 after setting said bridge plug, holding said valve open and setting pressure in said drill pipe string to pressure test said set bridge plug from below; and   closing said valve before pulling up said J-slot stinger portion from said J-slot top stinger on said bridge plug.   
     
     
         29 . The drill pipe string conveyed bridge plug running tool according to  claim 16 , wherein the dress-cutter blades are arranged for spanning a significant portion of an interior diameter of said casing. 
     
     
         30 . The drill pipe string conveyed bridge plug running tool according to  claim 16 , wherein said cylindrical sleeve-shaped stinger portion is provided with a transversely arranged front cutter blade having a cutting width corresponding to an outside diameter of said cylindrical sleeve-shaped stinger portion. 
     
     
         31 . The drill pipe string conveyed bridge plug running tool according to  claim 17 , wherein said cylindrical sleeve-shaped stinger portion is provided with a transversely arranged front cutter blade having a cutting width corresponding to an outside diameter of said cylindrical sleeve-shaped stinger portion. 
     
     
         32 . The drill pipe string conveyed bridge plug running tool according to  claim 16 , wherein said dress-cutter blades have a part-helical shape about said mandrel. 
     
     
         33 . The drill pipe string conveyed bridge plug running tool according to  claim 17 , wherein said dress-cutter blades have a part-helical shape about said mandrel. 
     
     
         34 . The drill pipe string conveyed bridge plug running tool according to  claim 18 , wherein said dress-cutter blades have a part-helical shape about said mandrel.