| 摘要 |
<p>A perforating gun for perforating earth formations, primarily in oil and gas wells. The gun includes a straight metal tube in which explosive jet charges are carried. A mounting apparatus within the tube holds the charges in pairs, the pairs being spaced vertically from each other. The charges within a pair point in the same general direction. The axis of each charge within a pair lies in a common horizontal plane with the axis of the other charge in the pair. The gun is operable with a decentralizer that places it in contact with the casing wall for firing. An alignment device within the gun assures that the charges are all pointing toward the nearest wall.</p> |
