Method and Apparatus for Exposing a Servicing Apparatus to Multiple Formation Zones

Abstract

A well bore servicing apparatus comprising an first sleeve slidably disposed in a tubing section, an second sleeve slidably disposed in the first sleeve, an indexing slot disposed on one of the outer sleeve and inner sleeve, and a control lug disposed on the other of the outer sleeve and the inner sleeve to communicate with the indexing slot, and an expandable seat disposed in the inner sleeve to receive a plurality of obturating members. A well bore servicing apparatus comprising a work string, a tubing section coupled to the work string, a plurality of sleeve assemblies disposed in the tubing section, and a plurality of seats for receiving an obturating member, one seat disposed in each of the sleeve assemblies, wherein the plurality of seats are substantially the same size.

1 . A well bore servicing apparatus comprising:
 an first sleeve slidably disposed in a tubing section;   an second sleeve slidably disposed in the first sleeve;   an indexing slot disposed on one of the outer sleeve and inner sleeve, and a control lug disposed on the other of the outer sleeve and the inner sleeve to communicate with the indexing slot; and   an expandable seat disposed in the inner sleeve to receive a plurality of obturating members.   
     
     
         2 . The apparatus of  claim 1  wherein the lug is disposed within the indexing slot to guide relative movement between the first sleeve and the second sleeve. 
     
     
         3 . The apparatus of  claim 1  wherein the plurality of obturating members are the same size. 
     
     
         4 . The apparatus of  claim 2  wherein the indexing slot includes a plurality of stop positions and a plurality of release positions for the lug. 
     
     
         5 . The apparatus of  claim 4  wherein the plurality of stop positions correspond to a contracted position of the expandable seat and the plurality of release positions correspond to an expanded position of the expandable seat for passing through the plurality of obturating members. 
     
     
         6 . The apparatus of  claim 1  wherein the expandable seat includes a plurality of collet fingers. 
     
     
         7 . The apparatus of  claim 6  wherein the collet fingers are normally open. 
     
     
         8 . The apparatus of  claim 6  wherein the collet fingers are normally closed. 
     
     
         9 . The apparatus of  claim 6  wherein the collet fingers are dipped or coated. 
     
     
         10 . A well bore servicing apparatus comprising:
 a work string;   a tubing section coupled to the work string;   a plurality of sleeve assemblies disposed in the tubing section; and   a plurality of seats for receiving an obturating member, one seat disposed in each of the sleeve assemblies;   wherein the plurality of seats are substantially the same size.   
     
     
         11 . The apparatus of  claim 10  wherein the seats are operable to receive a series of obturating members having substantially the same size. 
     
     
         12 . The apparatus of  claim 11  wherein the series of obturating members are operable to successively actuate the plurality of sleeve assemblies adjacent multiple formation zones. 
     
     
         13 . The apparatus of  claim 10  wherein the tubing section having the plurality of sleeve assemblies includes a substantially uniform minimum flow bore diameter over its axial length. 
     
     
         14 . The apparatus of  claim 10  wherein all sleeve assemblies disposed in the tubing section are actuatable by the same size obturating member. 
     
     
         15 . The apparatus of  claim 10  further comprising an indexing slot and a corresponding control lug disposed in each of the sleeve assemblies. 
     
     
         16 . The apparatus of  claim 15  wherein the control lugs communicate with positions in the indexing slot to count the number of obturating members that pass through an inner sleeve assembly. 
     
     
         17 . The apparatus of  claim 10  further including an electronic counter operable to detect the obturating member. 
     
     
         18 . The apparatus of  claim 10  further including a drive means coupled to an indexing assembly in each of the sleeve assemblies. 
     
     
         19 . The apparatus of  claim 11  further comprising an electronic tag in each of the obturating members, an electronic counter in each of an inner sleeve assembly disposed in each of the sleeve assemblies, and an electro-mechanical actuator coupled to the inner sleeves. 
     
     
         20 . A method of servicing a well bore comprising:
 disposing a tubing section in the well bore;   positioning the tubing section adjacent a plurality of formation zones;   passing a first obturating member through a first moveable sleeve;   catching the first obturating member in a second moveable sleeve to actuate a sleeve assembly adjacent a first formation zone; and   catching a second obturating member in the first moveable sleeve to actuate a second sleeve assembly adjacent a second formation zone;   wherein the first and second obturating members are substantially the same size.   
     
     
         21 . The method of  claim 20  further comprising passing a plurality of same-size obturating members through the first moveable sleeve and actuating a plurality of sleeve assemblies below the first moveable sleeve with the same-size obturating members. 
     
     
         22 . A method of servicing a well bore comprising:
 placing a tubing section in the well bore via a work string; and   actuating a plurality of sleeve assemblies in the tubing section with same-size obturating members.   
     
     
         23 . The method of  claim 22  further comprising pumping a treatment fluid through a flow bore in the tubing section having a substantially uniform inner diameter. 
     
     
         24 . The method of  claim 22  further comprising maintaining constant flow rates over the axial length of the tubing section having the plurality of sleeve assemblies. 
     
     
         25 . The method of  claim 22  further comprising maintaining constant treatment pressures over the axial length of the tubing section having the plurality of sleeve assemblies. 
     
     
         26 . A method of servicing a well bore comprising:
 disposing a tubing section having a plurality of actuatable sleeve assemblies in the well bore;   providing a series of obturating members having substantially the same size to actuate the sleeve assemblies; and   successively actuating the sleeve assemblies with the same-size obturating member to successively treat a plurality of formation zones.