Downhole plug with integrated slip cover and expansion element
Tools for sealing a tubing in a downhole environment. The tools feature top and bottom slip assemblies and a monolithic sealing element. The monolithic sealing element includes a portion that is disposed between the top and bottom slip assemblies as well as portions that encapsulate the slip assemblies. When the tool is actuated from a run-in configuration to a set configuration, the slips move toward each other squeezing the sealing element so that it forms a fluid-tight seal with the tubing. Teeth of the slip assemblies penetrate the portions of the sealing element disposed thereon and bite into the tubing.
1 . A tool for sealing in a tubing, the tool comprising:
a mandrel having an axial bore extending entirely therethrough when the tool is run down the tubing within a wellbore in a run-in configuration, the mandrel including a longitudinally extending tubular portion terminating at a base section, the base section having an enlarged outer diameter relative to an outer diameter of the tubular portion, the base section including an angled surface, wherein the axial bore provides a fluid pathway from above the mandrel to below the mandrel in the run-in configuration;
a setting ring disposed on the mandrel, the setting ring including an angled surface;
a top slip assembly disposed on the mandrel, the top slip assembly being in sliding engagement with the angled surface of the setting ring;
a bottom slip assembly disposed on the mandrel, the bottom slip assembly being in sliding engagement with the angled surface of the base section of the mandrel; and
a monolithic elastomeric sealing member completely encapsulating the top slip assembly and the bottom slip assembly, the monolithic elastomeric sealing member further being interposed between the top slip assembly and the bottom slip assembly;
wherein the mandrel includes an inner bore wall defining the axial bore of the mandrel, the inner bore wall including a ball seat configured to receive a ball to plug the axial bore of the mandrel, the ball seat positioned in the base section of the mandrel, wherein an inner diameter of the inner bore wall of the mandrel below the ball seat is reduced in size relative to an inner diameter of the inner bore wall of the mandrel above the ball seat.
2 . The tool of claim 1 , wherein the top slip assembly includes one or more teeth, the bottom slip assembly includes one or more teeth, or both the top slip assembly and the bottom slip assembly includes one or more teeth.
3 . The tool of claim 1 , wherein the one or more teeth are inset into respective recessed pockets in the top slip assembly and/or the bottom slip assembly.
4 . The tool of claim 1 , wherein the elastomeric sealing element comprises a polyurethane material.
5 . The tool of claim 1 , wherein the elastomeric sealing element comprises one or more materials selected from the group consisting of polyvinyl alcohol (PVA), styrenic block copolymers (TPE-s), copolyesters (COPEs), thermoplastic polyurethanes (TPU), polyamides (PEBA), thermoplastic polyolefinelastomers (TPE-o), polyolefin alloys (TPV), and thermoplastic olefinic elastomers (TPOs).
6 . The tool of claim 5 , wherein the elastomeric sealing element comprises PVA compounded with one or more of styrenic rubber, elastomeric nylon, ethylene-vinyl acetate (EVA), and foaming agents.
7 . The tool of claim 1 , wherein the mandrel, the top slip assembly, the bottom slip assembly, or any combination thereof comprises a degradable material.
8 . The tool of claim 7 , wherein the degradable material is a degradable metal.
9 . The tool of claim 7 , wherein the degradable material is a degradable polymer.
10 . The tool of claim 7 , wherein the degradable material is a degradable polymer blended with a degradable metal.
11 . The tool of claim 1 , wherein in addition to the run-in configuration, the tool has a set configuration; and wherein when the tool is placed in the set configuration, a sealing contact patch of the monolithic elastomeric sealing member extends over a length of the top slip assembly and the bottom slip assembly.
12 . A method of plugging a tubing comprising the steps of:
a) running a tool down the tubing within a wellbore in a run-in configuration, the tool comprising:
a mandrel having an axial bore extending entirely therethrough when the tool is in the run-in configuration, the mandrel including a longitudinally extending tubular portion terminating at a base section, the base section having an enlarged outer diameter relative to an outer diameter of the tubular portion, the base section including an angled surface, wherein the axial bore provides a fluid pathway from above the mandrel to below the mandrel in the run-in configuration;
a setting ring disposed on the mandrel, the setting ring including an angled surface;
a top slip assembly disposed on the mandrel, the top slip assembly being in sliding engagement with the angled surface of the setting ring;
a bottom slip assembly disposed on the mandrel, the bottom slip assembly being in sliding engagement with the angled surface of the base section of the mandrel; and
a monolithic elastomeric sealing member completely encapsulating the top slip assembly and the bottom slip assembly, the monolithic elastomeric sealing member further being interposed between the top slip assembly and the bottom slip assembly;
wherein the mandrel includes an inner bore wall defining the axial bore of the mandrel, the inner bore wall including a ball seat configured to receive a ball to plug the axial bore of the mandrel, the ball seat positioned in the base section of the mandrel, wherein an inner diameter of the inner bore wall of the mandrel below the ball seat is reduced in size relative to an inner diameter of the inner bore wall of the mandrel above the ball seat; and
b) applying a force to the tool to cause an actuation thereof, the actuation of the tool comprising moving the top slip assembly towards the bottom slip assembly, or moving the bottom slip assembly towards the top slip assembly, or moving the top slip assembly and the bottom slip assembly towards each other.
13 . The method of claim 12 , wherein the actuation of the tool further comprises a compression of the elastomeric sealing member between the top slip assembly and the bottom slip assembly causing the elastomeric sealing member to deform and form a sealing engagement with the tubing.
14 . The method of claim 13 , wherein the actuation of the tool further comprises an expansion of the top slip assembly and the bottom slip assembly to engage the tubing.
15 . The method of claim 14 , wherein each of the top slip assembly and the bottom slip assembly include teeth, and wherein the actuation of the tool comprises a puncture of the elastomeric sealing member by the teeth of the top slip assembly and by the teeth of the bottom slip assembly.
16 . The method of claim 12 , wherein the actuation of the tool comprises formation by the elastomeric sealing member of a contact patch with the tubing and wherein the contact patch extends over a length of the top slip assembly and the bottom slip assembly.