Patent EA-004186-B1 (EA)
Title: Method for treating multiple wellbore intervals
Inventor: TOLMAN RANDY C
IPC: E21B33/138
Filed: 2001-07-16
Abstract: 1. A method for treating multiple intervals of one or more subterranean formations intersected by a cased wellbore, said method comprising: a) using a perforating device to perforate at least one interval of said one or more subterranean formations; b) pumping a treating fluid into the perforations created in said at least one interval by said perforating device without removing said perforating device from said wellbore; c) deploying one or more diversion agents in said wellbore to removably block further fluid flow into said perforations; and d) repeating at least steps a) through b) for at least one more interval of said one or more subterranean formations, wherein after step a) and before blocking/unblocking of fluid flow in perforation the perforating device is moved in a position higher by at least one interval perforated in step a). 2. A method for treating multiple intervals of one or more subterranean formations intersected by a cased wellbore, said method comprising: a) using a select-fire perforating device containing multiple sets of one or more shaped-charge perforating charges to perforate at least one interval of said one or more subterranean formations; b) pumping a treating fluid into the perforations created in said at least one interval by said perforating device without removing said perforating device from said wellbore; c) deploying ball sealers in said wellbore to removably block further fluid flow into said perforations; and d) repeating at least steps a) through b) for at least one more interval of said one or more subterranean formations, wherein after step a) and before blocking/unblocking of fluid flow in perforation the perforating device is moved in a position higher by at least one interval perforated in step a). 3. The method of Claim 1 or 2 further comprising repeating step c) for at least one more interval of said one or more subterranean formations. 4. The method of Claim 1 wherein diversion agents deployed in said wellbore are selected from the group of ball sealers, particulates, gels, viscous fluids, and foams. 5. The method of Claim 1 wherein said diversion agents deployed in said wellbore is at least one mechanical sliding sleeve. 6. The method of Claim 5 wherein said perforating device is additionally used to actuate said mechanical sliding sleeves. 7. The method of Claim 1 wherein said diversion agent deployed in said wellbore is at least one mechanical flapper valve. 8. The method of Claim 7 wherein said perforating device is additionally used to actuate said mechanical flapper valve. 9. The method of Claim 1 or 2 wherein a wireline is used to suspend the perforating device in said wellbore. 10. The method of Claim 9 wherein a wireline isolation device is positioned in the wellbore near the point at which said treating fluid enters said wellbore to protect said wireline from said treating fluid. 11. The method of Claim 1 or 2 wherein said treating fluid is selected from the group of a slurry of a proppant material and a carrier fluid, a fracturing fluid containing no proppant material, an acid solution and an organic solvent. 12. The method of Claim 1 or 2 wherein a tubing string is used to suspend the perforating device in said wellbore. 13. The method of Claim 12 wherein a tubing isolation device is positioned in said wellbore near the point at which said treating fluid enters said wellbore to protect said tubing from said treating fluid. 14. The method of Claim 12 wherein said tubing string is selected from the group of coiled tubing and jointed tubing. 15. The method of Claim 1 wherein said perforating device is a select fire perforating gun containing multiple sets of one or more shaped charge perforating charges. 16. The method of Claim 12 wherein said perforating device is a jet cutting device that uses fluid pumped down said tubing string to establish hydraulic communication between said wellbore and said one or more intervals of said one or more subterranean formations. 17. The method of Claim 1 or 2 wherein said wellbore has casing-conveyed perforating charges affixed to said casing at locations corresponding to said multiple intervals of said one or more subterranean formations and said perforating device actuates at least one of said casing-conveyed charges in order to perforate at least one interval of said one or more subterranean formations. 18. The method of Claim 1 or 2 wherein a tractor device is used to move said perforating device within said wellbore. 19. The method of Claim 18 wherein said tractor device is actuated by an onboard computer system which also actuates said perforating device controlled by a wireline communication. 20. The method of Claim 18 wherein said tractor device is actuated and controlled by a wireline communication. 21. The method of Claim 1 or 2 wherein said perforating device has a depth locator connected thereto for controlling the location of said perforating device in said wellbore.