Method for controlling subsurface blowout

Details Method for controlling subsurface blowout Method for controlling subsurface blowout

E - Fixed Constructions

21

B

166/10

E21B 43/12 (2006.01) E21B 29/08 (2006.01) E21B 33/13 (2006.01) E21B 33/134 (2006.01) E21B 43/119 (2006.01) E21B 43/30 (2006.01)

Patent

CA 1196570

METHOD FOR CONTROLLING SUBSURFACE BLOWOUT ABSTRACT OF THE DISCLOSURE A method of recompleting or controlling the flow of a formation which is inaccessible through the original wellbore and which is losing valuable hydrocarbons to another formation. A second borehole is formed in close proximity to the first wellbore, and at least the bottom end of the new borehole is slanted until it penetrates the hydrocarbon bearing formation within shooting distance of the bottom end of the first wellbore. A large casing gun is run downhole through the new borehole. All of the shaped charges of the gun are oriented in the same direction. Indexing means are included by which all of the shaped charges of the gun are oriented to fire towards the casing of the first wellbore. After the gun is discharged, cement is pumped down the borehole, through the tunnels formed by the shaped charges, and into the perforations of the wellbore casing, thereby killing the flow of hydrocarbons from the damaged wellbore. The two wells may be abandoned, or a whipstock can be employed to form a third lower end of still another borehole branched off the second borehole which penetrates the high pressure lower production forma- tion so that production can be established while salvaging the second one of the holes.

395611

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