Top down frac sleeve, method and system

Abstract

A frac assembly including a housing, a port defined radially through the housing, a sleeve disposed in the housing, a self-displacing seat disposed on the sleeve, and a biasing member disposed between the sleeve and the housing. A method for fracturing a wellbore including dropping an object into the wellbore, landing the object on a frac assembly in the wellbore, pressuring the wellbore, reclosing a sleeve of the frac assembly.

What is claimed is: 
     
         1 . A frac assembly comprising:
 a housing;   a port defined radially through the housing;   a sleeve disposed in the housing;   a self-displacing seat disposed on the sleeve; and   a biasing member disposed between the sleeve and the housing.   
     
     
         2 . The frac assembly as claimed in  claim 1  wherein the housing includes recess of sufficient dimension to allow the self-displacing seat to achieve an inside diameter larger than an object to be seated on the self-displacing seat when the self-displacing seat is in an object retention position. 
     
     
         3 . The frac assembly as claimed in  claim 1  wherein the self-displacing seat comprises a plurality of segments. 
     
     
         4 . The frac assembly as claimed in  claim 1  wherein the segments are movable radially. 
     
     
         5 . The frac assembly as claimed in  claim 4  wherein the segments are movable radially by impetus of an object seated thereon. 
     
     
         6 . The frac assembly as claimed in  claim 4  wherein the segments are moved radially by impetus of a spring. 
     
     
         7 . The frac assembly as claimed in  claim 1  wherein the segments are movable radially outwardly. 
     
     
         8 . The frac assembly as claimed in  claim 1  wherein the self-displacing seat locks the sleeve in a reclosed position. 
     
     
         9 . The frac assembly as claimed in  claim 1  wherein the biasing member biases the sleeve to a closed position. 
     
     
         10 . A method for fracturing a wellbore comprising:
 dropping an object into the wellbore;   landing the object on a frac assembly in the wellbore;   pressuring the wellbore;   reclosing a sleeve of the frac assembly.   
     
     
         11 . The method as claimed in  claim 10  further including:
 locking the sleeve in the reclosed position with a self-displacing seat on the sleeve. 
 
     
     
         12 . The method as claimed in  claim 11  further comprising releasing the object from the seat when the seat moves to the locking position. 
     
     
         13 . The method as claimed in  claim 12  further comprising moving the same object to a next adjacent frac assembly and landing the object on the next adjacent frac assembly. 
     
     
         14 . The method as claimed in  claim 11  wherein landing the object includes releasing a release configuration and opening the sleeve. 
     
     
         15 . The method as claimed in  claim 11  wherein the reclosing is by biasing spring. 
     
     
         16 . The method as claimed in  claim 11  wherein locking the sleeve is by radially outwardly displacing a plurality of seat segments into a recess in a housing. 
     
     
         17 . The method as claimed in  claim 11  wherein the displacing is to an extent that an inside dimension of the seat is larger than the object. 
     
     
         18 . A wellbore system comprising:
 a borehole in a subsurface formation;   a string in the borehole; and   a frac assembly as claimed in  claim 1  disposed with the string.   
     
     
         19 . The system as claimed in  claim 18  wherein the frac assembly is a plurality of frac assemblies all responsive to the same object.