Top set plug and method

Abstract

A top set plug for sealing against a casing of a well. The plug includes a mandrel having a throughout bore that extends from a top end to a bottom end; a connecting mechanism located at the top end of the mandrel; a sealing element located around the mandrel and configured to be pushed toward an internal wall of the casing; an upper wedge configured to push the sealing element against the casing; and a slip ring configured to push the sealing element over the upper wedge and also to engage the inner wall of the casing with buttons for preventing the plug to slide along the casing.

1 . A top set plug for sealing against a casing of a well, the plug comprising:
 a mandrel having a throughout bore that extends from a top end to a bottom end;   a connecting mechanism located at the top end of the mandrel, wherein the connecting mechanism is configured to connect to a setting tool and the connecting mechanism is attached with a shear member to the mandrel;   a sealing element located around the mandrel and configured to be pushed toward an internal wall of the casing;   an upper wedge configured to push the sealing element against the casing; and   a slip ring configured to push the sealing element over the upper wedge and also to engage the inner wall of the casing with buttons for preventing the plug to slide along the casing,   wherein the shear member is manufactured to break before any other part of the mandrel to release the connecting mechanism, and   wherein there is no lower wedge to push against the sealing element.   
     
     
         2 . The plug of  claim 1 , wherein the mandrel has a deep seat formed away from the top and bottom ends of the mandrel. 
     
     
         3 . The plug of  claim 2 , wherein the deep seat is formed directly across from the slip ring, or directly across from the upper wedge, or directly across from the sealing element. 
     
     
         4 . The plug of  claim 1 , wherein the slip ring is the only slip ring of the plug. 
     
     
         5 . The plug of  claim 1 , further comprising:
 a second seat formed at an end of the mandrel, away from the deep seat.   
     
     
         6 . The plug of  claim 1 , wherein the mandrel has a seat formed at the top end. 
     
     
         7 . The plug of  claim 1 , wherein the entire plug is formed of one or more dissolvable materials. 
     
     
         8 . The plug of  claim 1 , wherein at least one of the mandrel, the sealing element, the upper wedge, and the slip ring are formed from a dissolvable material. 
     
     
         9 . The plug of  claim 1 , further comprising:
 a guiding element fixedly attached to the bottom end of the mandrel.   
     
     
         10 . The plug of  claim 1 , wherein the mandrel has a flared-up part that is configured to push the upper wedge toward the sealing element and also radially away from a longitudinal axis of the mandrel. 
     
     
         11 . A top set plug for sealing against a casing of a well, the plug comprising:
 a mandrel having a throughout bore that extends from a top end to a bottom end;   a connecting mechanism that is configured to connect to a setting tool, wherein the connecting mechanism is attached through a shear member to the mandrel;   a sealing element partially located around the mandrel and having a top end and a bottom end, wherein the top end is configured to be pushed toward an internal wall of the casing and acts as a seal while the bottom end is configured as a ramp; and   a slip ring configured to engage the inner wall of the casing with buttons for preventing the plug to slide along the casing,   wherein the bottom end of the sealing element enters into a bore of the slip ring and pushes the slip ring radially outward toward the inner wall of the casing, and   wherein the shear member is manufactured to break before any other part of the mandrel to release the connecting mechanism.   
     
     
         12 . The plug of  claim 11 , wherein the mandrel has a deep seat formed away from the top and bottom ends of the mandrel. 
     
     
         13 . The plug of  claim 12 , wherein the deep seat is formed directly across from the slip ring. 
     
     
         14 . The plug of  claim 12 , wherein the deep seat is formed directly across from the sealing element. 
     
     
         15 . The plug of  claim 11 , wherein the entire plug is formed of one or more dissolvable materials. 
     
     
         16 . The plug of  claim 11 , wherein the sealing element is the first element of the plug at the upstream end of the plug. 
     
     
         17 . The plug of  claim 11 , further comprising:
 a guiding element fixedly attached to the bottom end of the mandrel.   
     
     
         18 . A method for plugging a casing in a well, the method comprising:
 attaching a setting tool to a frac plug, wherein a ball is placed inside the setting tool;   lowering the setting tool, the ball and the frac plug to a desired depth into the casing of the well;   activating the setting tool to set up the frac plug, wherein a connection between the setting tool and the frac plug is located at a top end of the frac plug;   removing the setting tool after the connection between the setting tool and the frac plug is broken; and   pressuring the ball to seat onto a seat formed into a mandrel of the frac plug.   
     
     
         19 . The method of  claim 18 , wherein the seat is a deep seat, which is located away from the top end and a bottom end of the mandrel, to provide structural support to the frac plug. 
     
     
         20 . The method of  claim 18 , wherein the frac plug has only an upper wedge and not a lower wedge. 
     
     
         21 . The method of  claim 18 , wherein one or more elements of the frac plug are made of a dissolvable material.