Mandrel-less Launch Toe Initiation Sleeve (TIS)

Abstract

The present invention is a valve tool utilized for hydraulically fracturing multiple zones in an oil and gas well without perforating the cement casing. An oil/gas well completion method involves the use of a valve that is installed as part of the casing string of the well. A mandrel-less casing provides for cement flow within the casing when the valve element is in a closed position and allows for axial flow of fracturing fluid through the cement casing to fracture the formation near the valve when the sleeve is open. The invention disclosed herein is an improved valve used in this process.

I claim: 
     
         1 . A well valve tool for providing a window to the environment around the valve tool, the tool comprising:
 a top sub and a bottom sub, wherein said top sub is not connected directly to said bottom sub;   an outer sleeve connected between said top sub and said bottom sub having at least one window;   an inner sleeve connected between said top sub and said bottom sub within said outer sleeve to define an inner passage way selectively preventing fluid communication between an area within said top sub, bottom sub and inner sleeve with said outer sleeve at least one window.   
     
     
         2 . The well valve tool of  claim 1 , wherein said sleeve is selectively slidable along one of the group of said top sub and said bottom sub to selectively provide fluid communication between said inner passage way and said outer sleeve at least one window. 
     
     
         3 . The well valve tool of  claim 1 , wherein said sleeve is connected to one of the group of said top sub and said bottom sub by at least one shear pin or a shear disc. 
     
     
         4 . The well valve tool of  claim 1 , wherein said sleeve includes a pressure burst valve for pressurizing said sleeve to cause said sleeve to slide along one of the group of said top sub and said bottom sub to selectively provide fluid communication between said inner passage way and said outer sleeve at least one window. 
     
     
         5 . A method of operating a well valve tool comprising:
 providing a top sub and a bottom sub;   connecting an outer sleeve between said top sub and said bottom sub, wherein said outer sleeve includes at least one window;   connecting an inner sleeve between said top sub and said bottom sub and within said outer sleeve to selective seal said outer sleeve from an area defined within said top sub, said bottom sub and said inner sleeve.   
     
     
         6 . The method of operating a well valve tool of  claim 5 , further comprising:
 is running said valve tool within a well;   pouring cement within said valve tool;   removing said cement from said valve tool by moving a plug through said valve tool.   
     
     
         7 . The method of operating a well valve tool of  claim 5 , further comprising:
 running said valve tool within a well;   pouring cement within said valve tool;   removing said cement from said valve tool by moving a plug through said valve tool;   pressurizing the inner passage of said valve tool;   said pressure operating to move the inner sleeve relative to said outer sleeve to allow fluid communication between the inner passage and said outer sleeve;   pumping fracking fluid through said at least one window of said outer sleeve.   
     
     
         8 . The method of operating a well valve tool of  claim 5 , further comprising:
 running said valve tool within a well;   pouring cement within said valve tool;   removing said cement from said valve tool by moving a plug through said valve tool;   providing a pressure burst valve between said inner passage and an inner sleeve actuation chamber;   pressurizing the inner passage of said valve tool;   raising said pressure until said pressure burst valve bursts allowing pressurization of said inner sleeve actuation chamber;   said pressure in said inner sleeve actuation chamber operating to move the inner sleeve relative to said outer sleeve to allow fluid communication between the inner passage and said outer sleeve.