E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/11 (2006.01) E21B 43/116 (2006.01) E21B 43/1185 (2006.01)
Patent
CA 2105004
A system is provided for selectively perforating multiple zones in a well an a single trip into the well. The system includes a tubing string which carries at least a first and a second perforating gun. At least a first and a second pressure actuated firing head are associated with the first and second perforating guns, respectively. A source of actuating fluid pressure for the firing head is provided, which may be the bore of the tubing string. A first selective communication device is provided for isolating the second firing head from the source of actuating fluid pressure until after the first perforating gun has been fired, and for then communicating the second firing head with the source of actuating fluid pressure in response to firing of the first perforating gun. The first firing head provides a time delay during which the actuating fluid pressure may be bled off prior to the firing of the first perforating gun.
Burleson John D.
George Flint R.
Mason Justin L.
Haliburton Company
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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