Pressure Switches

The EBS multi-carrier select fire system allows shooting any number of random length guns with one trip into the wall. Length and number of selections are limited only by rig height, line strength, hole deviation, etc.

Disposable, polarity discriminating switches provide selective firing control.

Pressure switches are actuated by the shock wave from charges and detonating cord in carrier below the switch. A patented hydraulic function differentiates between pressure from a flooded gun and blast pressure. This feature prevents a leak from arming guns out of sequence.

A schematic is shown with the loading procedures.

P-100 (Positive Pressure Switch)

Select fire negative switch. Red wire with diode and yellow wire. Yellow wire connects to rope socket (through circuit), downhole pin continues through circuit to lower gun or guns, and red wire connects to detonator. Red wire is open until gun below switch detonates. Detonator wire diode blocks NEGATIVE –DC current from detonator but passes POSITIVE +DC current to detonator.

Rating: 400◦ F 15,000 psi for 1 hour

N-100 (Negative Pressure Switch)

Select fire negative switch. Black wire with diode and yellow wire. Yellow wire connects to rope socket (through circuit), downhole pin continues through circuit to lower gun or guns, and black wire connects to detonator. Black wire is open until gun below switch detonates. Detonator wire diode blocks POSITIVE +DC current from detonator but passes NEGATIVE –DC current to detonator.

Rating: 400◦ F 15,000 psi for 1 hour

Download Product Spec Sheet (PDF)