| 摘要 |
<p>Methods and apparatus are provided for detonating high explosive devices (198) downhole in a well. A high explosive device includes a detonating cord (200) having a first end and a second end. A first device (196) is provided for initiating a detonation of a detonating cord at its first end and a second device (10) is provided for initiating a detonation of the detonating cord at its second end. Thus is the first initiator device fails to initiate detonation of the cord, there is the possibility that the second initiator device will be successful. Furthermore, if only part of the cord is detonated in response to the first initiator device, the second initiator device can be used to detonate the cord from its other end.</p> |
