Perforating gun firing tool and method of operation

Patent · Tue Feb 14 04:00:00 EST 1989

OSTI ID:6161602

Wesson, D S; McMahan, M E; George, F R

An apparatus is described for completing a cased borehole, comprising: a pipe string suspended within the cased borehole; a packer disposed on the pipe string for forming a lower annulus and an upper annulus; a flow valve located in the pipe string above the packer for preventing fluid flow through the flow bore of the pipe string when in the closed position; an annulus access valve located in the wall of the pipe string below the flow valve and above the packer for permitting fluid flow from the upper annulus into the flow bore of the pipe string when in the open position; a perforating gun suspended on the lower end of the pipe string; a pressure responsive firing head disposed below the packer and connected to the perforating gun; means for increasing the fluid pressure in the upper annulus; a valve operating means for closing the flow valve while substantially simultaneously opening the annulus access valve to permit the increased fluid pressure in the upper annulus to be transmitted through the flow bore of the pipe string to the firing head so as to actuate the firing head and detonate the perforating gun.

• Assignee: Halliburton Services, Duncan, OK
• Patent Number(s): US 4804044
• OSTI ID: 6161602
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CONTROL EQUIPMENT
DESIGN
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
FLOW REGULATORS
NATURAL GAS WELLS
OIL WELLS
OPERATION
PACKINGS
PERFORATION
PIPES
TOOLS
VALVES
WELL COMPLETION
WELLS