| 摘要 |
A perforating device having a longitudinal axis and comprising a loading tub e having an explosive charge; a first layer slidably, non-fixedly, and removab ly disposed over the loading tube; and an outer layer in fixed engagement over the first layer, the first and outer layers forming a gun wall. In one embodiment, additional layers may be disposed between the inner and outer layers. In another embodiment, recesses or scallops are machined the outer layer and/or can be machined into the inner or additional layers. The machin ed recesses are disposed such that the explosive charge penetrates the gun wall at the machined recesses. A method of making the perforating device also is disclosed. The perforating device preferably can be used in oil and gas well s to fracture surrounding strata.
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