Method and apparatus for plugging a wellbore
First Claim
1. An apparatus for use in plugging a wellbore, comprising:
- a cement retainer for disposal on a run-in string of tubular; and
at least one radially expanded perforating assembly disposed below the cement retainer.
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Accused Products
Abstract
The present invention provides a method and apparatus for plugging a wellbore in a trip saving manner. In one aspect, the invention includes a cement retainer disposed on a run-in string and a radially expanded perforating assembly disposed below the cement retainer. In a single run, the apparatus provides for perforating a wellbore and squeezing cement through the perforations and into the formation therearound. In another aspect, a method of plugging the wellbore includes running a cement retainer and a radially expanded perforating assembly into a wellbore on a run-in string. After the cement retainer is set, a firing head is actuated to cause the perforating gun to discharge. After perforations are formed, cement is introduced from the cement retainer into the isolated area and squeezed through the perforations. Thereafter, the run-in string disengages from the cement retainer leaving behind the plug formed. In yet another aspect, a firing head capable of being actuated by different means is used to discharge the perforating assembly.
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Citations
36 Claims
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1. An apparatus for use in plugging a wellbore, comprising:
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a cement retainer for disposal on a run-in string of tubular; and
at least one radially expanded perforating assembly disposed below the cement retainer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of plugging a wellbore, comprising:
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running an apparatus into the wellbore on a tubular string, the apparatus including;
a cement retainer disposed on the tubular string; and
a radially expanded perforating assembly disposed below the cement retainer;
setting the cement retainer to seal an annular area between the cement retainer and a casing wall therebetween;
causing the perforating assembly to discharge and forming perforations in the casing wall; and
injecting cement through the tubular string and into a formation adjacent the perforations. - View Dependent Claims (12, 13, 14, 15, 16, 17, 19, 20)
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18. An apparatus for use in plugging a wellbore, comprising:
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means for lowering a cement retainer and at least one radially expanded perforating assembly into the wellbore;
means for setting the cement retainer against a casing; and
means for discharging the perforating assembly.
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21. A firing head for igniting a charge in a wellbore, comprising:
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a body having a central channel therethough;
a two position firing pin disposed in the bore, the firing pin constructed and arranged to ignite the charge in a second position; and
a frangible member disposed in the bore above the pin, the frangible member dividing the bore into an upper and lower portions, the upper portion having a higher pressure therein than the lower portion. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 30, 31, 32, 33, 35, 36)
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29. A firing head for discharging a perforating assembly, comprising:
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a body;
a channel disposed in the body;
a plug at least partially disposed in the channel;
a rupture disc assembly disposed below the plug;
a firing pin disposed below the rupture disc assembly;
a roll pin at least partially disposed in the body and the plug; and
a retention pin at least partially disposed in the firing pin.
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34. A method for actuating a firing head for discharging a perforating assembly, comprising:
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supplying a force to break a membrane disposed above a firing pin;
increasing a pressure above the firing pin; and
causing the firing pin to strike a primer cap.
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Specification