Behind casing well perforating and isolation system and related methods

Abstract

Disclosed is a novel unconventional multi-stage completions system and method called a behind casing perforation and isolation system and methods. It replaces the traditional plug and perforating electric wireline operations, and employs dual action charges and isolation valve control mechanism behind casing with the isolation valves (flapper, ball or similar) inside casing which enable the completion of unconventional multi-stage wells in a more time and cost-efficient way.

I claim: 
     
         1 . The behind casing perforating and isolation system includes one or more stage assemblies consisting of:
 at least one perforation gun assembly; and,   at least one isolation valve assembly.   
     
     
         2 . The behind casing perforating and isolation system of  claim 1  wherein the perforation gun assembly features a plurality of dual action explosive charges. 
     
     
         3 . The behind casing perforation and isolation system of  claim 2  wherein the perforation gun assembly is placed outside a wellbore casing. 
     
     
         4 . The behind casing perforation and isolation system of  claim 3  wherein the isolation valve assembly features isolation valve release mechanism behind casing and isolation valve inside casing. 
     
     
         5 . The behind casing perforation and isolation system of  claim 4  further comprising a communication system that includes one or combination of following methods: electric cable, acoustic repeater, electromagnetic waves, or fluid pressure pulse systems. 
     
     
         6 . The behind casing perforation and isolation system of  claim 5  wherein the dual action charge is comprised of two joint explosive charges or two single explosive charges 
     
     
         7 . A behind casing perforation system comprising:
 at least one stage assembly.   
     
     
         8 . The behind casing perforation and isolation system of  claim 7  wherein the stage assembly is comprised of at least one addressable switch, at least one detonator, a plurality of gun assemblies, and a plurality of isolation valves assemblies (flapper, ball or similar valves) in series. 
     
     
         9 . The behind casing perforation and isolation system of  claim 8  further comprising a surface acquisition system. 
     
     
         10 . The behind casing perforation and isolation system of  claim 9  further comprising an electric cable connected to gun assemblies and isolation valve assemblies. 
     
     
         11 . The behind casing perforation and isolation system of  claim 10  further comprising a ballistic and electric interface box. 
     
     
         12 . The behind casing perforation and isolation system of  claim 11  further comprising a plurality of acoustic repeaters or electromagnetic waves repeaters 
     
     
         13 . The behind casing perforation and isolation system of  claim 12  further comprising a ballistic electric control line. 
     
     
         14 . The behind casing perforation and isolation system of  claim 13  wherein the ballistic electric control line is comprised of a steel pipe, a detonating cord and an electric line. 
     
     
         15 . A method of building a well comprising:
 drilling a vertical then horizontal wellbore into a rock formation;   casing the wellbore; filling a wellbore annulus with cement;   closing isolation valve and, firing a plurality of dual action perforating guns in a first stage.   
     
     
         16 . The method of  claim 15  further comprising closing an isolation valve for every stage assembly. 
     
     
         17 . The method of  claim 16  confirming valve closure with a sensor or building up pressure. 
     
     
         18 . The method of  claim 17  further comprising firing multiple plurality of dual action charges and perforating guns. 
     
     
         19 . The method of  claim 18  further comprising pumping a fracking fluid into the wellbore. 
     
     
         20 . The method of  claim 19  further comprising drilling out or reopening the isolations valves with suitable well intervention technique if needed. 
     
     
         21 . The method of  claim 20  further comprising flowing back a fracking fluid out of the wellbore before putting well on production.