Modular changeable fractionation plug

Abstract

A modular changeable fractionation plug for use in a wellbore with a crown engagement and a plug receiving end formed on a mandrel which is adapted to be a caged ball configuration, a drop ball configuration and a bridge plug configuration.

The invention is claimed as follows: 
     
         1 . A fractionation plug comprising a mandrel configured to be selectively arranged in one of at least three different configurations. 
     
     
         2 . The fractionation plug of  claim 1 , wherein the mandrel comprises a central annulus extending longitudinally through the mandrel, and the central annulus comprises a first plug receiving portion. 
     
     
         3 . The fractionation plug of  claim 2  wherein one of the configurations is a bridge plug configuration. 
     
     
         4 . The fractionation plug of  claim 3 , wherein the fractionation plug in the bridge plug configuration comprises a first bridge device threaded into the first plug receiving portion. 
     
     
         5 . The fractionation plug of  claim 4 , wherein the bridge device comprises a solid end that isolates a portion of the central annulus upstream from the bridge device from a portion of the central annulus downstream of the bridge device. 
     
     
         6 . The fractionation plug of  claim 4 , wherein the first bridge device comprises internal shear threads complementary to a setting tool. 
     
     
         7 . The fractionation plug of  claim 4 , wherein the fractionation plug in the bridge plug configuration comprises a second bridge device threaded into a second plug receiving portion of the mandrel. 
     
     
         8 . The fractionation plug of  claim 2 , wherein one of the configurations is a caged ball configuration. 
     
     
         9 . The fractionation plug of  claim 8 , wherein the fractionation plug in the bridge plug configuration comprises a caged ball device comprising a caged ball and threaded into the first plug receiving portion. 
     
     
         10 . The fractionation plug of  claim 9 , wherein the caged ball device comprises an internal caged ball seat. 
     
     
         11 . The fractionation plug of  claim 9 , wherein the caged ball device comprises a caged ball retaining rod. 
     
     
         12 . The fractionation plug of  claim 11 , wherein the caged ball retaining rod extends across the central annulus. 
     
     
         13 . The fractionation plug of  claim 9 , wherein the caged ball device comprises internal shear threads complementary to a setting tool. 
     
     
         14 . The fractionation plug of  claim 2 , wherein one of the configurations is a ball drop configuration. 
     
     
         15 . The fractionation plug of  claim 14 , wherein the fractionation plug in the ball drop configuration comprises a ball drop device threaded into the first plug receiving portion. 
     
     
         16 . The fractionation plug of  claim 15 , wherein the ball drop device comprises a body and an annulus centrally formed in the body and extending longitudinally through the body. 
     
     
         17 . The fractionation plug of  claim 14 , wherein the ball drop device comprises internal shear threads in the annulus of the body and complementary to a setting tool. 
     
     
         18 . A system for fractionation of a wellbore, the system comprising:
 a fractionation plug comprising a mandrel comprising a plug receiving portion;   a bridge device configured to be received by the plug receiving portion;   a caged ball device configured to be received by the plug receiving portion; and   a ball drop device configured to be received by the plug receiving portion.   
     
     
         19 . The system of  claim 18  wherein the mandrel comprises internal threads, and each of the bridge device, the caged ball device, and the ball drop device comprise external threads complementary to the internal threads of the mandrel. 
     
     
         20 . A method comprising:
 selectively arranging a fractionation plug in one of at least three different configurations, the at least three configurations comprising a bridge plug configuration, a caged ball configuration and a ball drop configuration.