초록 ▼

An apparatus and method is provided to reduce interference resulting from activation of explosive devices. One type of interference is charge-to-charge interference, and another type of interference is pre-shock interference between a detonating cord and an explosive, such as a shaped charge. To red

An apparatus and method is provided to reduce interference resulting from activation of explosive devices. One type of interference is charge-to-charge interference, and another type of interference is pre-shock interference between a detonating cord and an explosive, such as a shaped charge. To reduce interference, one or more shock impeding elements are placed proximal one or more explosives to impede propagation of shock caused by detonation of the explosives. The shock impeding elements include a porous material, such as a porous liquid or solid. In another arrangement, a shock barrier may be positioned between a detonating cord and an explosive to reduce pre-shock interference. In yet another feature, an encapsulant may be provided around one or more shaped charges to enhance structural support for the shaped charges.

대표청구항 ▼

An apparatus and method is provided to reduce interference resulting from activation of explosive devices. One type of interference is charge-to-charge interference, and another type of interference is pre-shock interference between a detonating cord and an explosive, such as a shaped charge. To red

An apparatus and method is provided to reduce interference resulting from activation of explosive devices. One type of interference is charge-to-charge interference, and another type of interference is pre-shock interference between a detonating cord and an explosive, such as a shaped charge. To reduce interference, one or more shock impeding elements are placed proximal one or more explosives to impede propagation of shock caused by detonation of the explosives. The shock impeding elements include a porous material, such as a porous liquid or solid. In another arrangement, a shock barrier may be positioned between a detonating cord and an explosive to reduce pre-shock interference. In yet another feature, an encapsulant may be provided around one or more shaped charges to enhance structural support for the shaped charges. and a housing, the aperture being selectively positioned between an open position and a closed position, wherein when the aperture is in the open position a fluid is permitted to flow into the housing to disengage the temporary mechanical connection. 8. The packer of claims 7, wherein when the aperture is in the closed position the fluid is not permitted to flow into the housing. 9. The packer of claim 2, wherein when the temporary mechanical connection is disengaged, the first tubular subunit and the second tubular subunit is adapted to compress the flexible packing element, whereby the flexible packing element expands to seal the annular space. 10. The packer of claim 2, wherein the first tubular subunit and the second tubular subunit are coupled together to allow torque to be transmitted therebetween. 11. A packer for sealing an annular space in a wellbore, the wellbore having a string of casing therein, the packer comprising: a first tubular subunit; a second tubular subunit; an inner sleeve operatively connected to the second subunit, and slidably received within the first subunit; a flexible packing element disposed between the first subunit and the second subunit, and arranged such that mechanical compression of the first subunit towards the second subunit extrudes the flexible packing element into sealed radial engagement with the surrounding casing; and a releasable mechanical connection adapted to restrain the first subunit and the second subunit from compressing the flexible packing element until the releasable mechanical connection is released, wherein the temporary mechanical connection is hydraulically released before the flexible packing element is extruded. 12. The apparatus of claim 11, wherein the temporary mechanical connection is hydraulically disengaged by a first pressure, and wherein the valve is hydraulically opened by a second pressure higher than the first pressure. 13. The apparatus of claim 12, further comprising: a locator selectively fixable against downward weight within the casing at a predetermined location. 14. The apparatus of claim 13, wherein the locator is disposed below the packer. 15. The apparatus of claim 13, further comprising: a cement inflation tool. 16. A packer for sealing an annular space, comprising: a first tubular subunit and a second tubular subunit moveably coupled together; a flexible packing element disposed between the first tubular subunit and the second tubular subunit, wherein the first tubular subunit is disposed adjacent a first end of the packing element and wherein the second tubular subunit is disposed adjacent a second end of the packing element; a temporary mechanical connection adapted to restrain the first tubular subunit and the second tubular subunit from compressing the flexible packing element, wherein the temporary mechanical connection is adapted to be hydraulically disengaged; and an aperture, between a central bore of the packer and a housing, adapted to be selectively positioned between an open position and a closed position, wherein when the aperture is in the open position a fluid is permitted to flow into the housing to disengage the temporary mechanical connection, and wherein when the aperture is in the closed position and the packing element is compressed, the fluid is not permitted to flow into the housing. 17. The packer of claim 16, further comprising a sliding key moveably coupling the first tubular subunit and the second tubular subunit together and allowing torque to be transmitted therebetween. 18. An apparatus for use in wellbore operations, comprising: a valve; and a packer disposed below the valve, wherein the packer comprises: a first tubular subunit and a second tubular subunit moveably coupled together; a flexible packing element disposed between the first tubular subunit and the second tubular subunit, wherein the first tubular subunit has a surface disposed adjacent a first end of the packing elem