| 摘要 |
<p>In accordance with illustrative embodiments of the present invention as disclosed herein, a safety switch (13) for preventing accidental firing of an explosive well tool includes a tubular metal body (22) connected between the cable head (14) and the well tool, a conductor wire (48) extending through such body for carrying current from the cable to the well tool, and a contact plug (36) mounted in a side opening (33) in the body and arranged to be selectively advanced into shorting contact with the conductor wire.</p> |
