Pressure-activated well perforating apparatus

Patent · Tue Dec 24 04:00:00 EST 1985

OSTI ID:5911443

Upchurch, J M

A well perforating technique utilizes a predetermined pressure difference developed at different points in the borehole to actuate the firing mechanism of a tubing conveyed perforating gun. A first embodiment incorporated as part of a well test string includes a packer for isolating a wellbore interval and a perforating gun connected in the string below the packer which is fired in response to development of a greater pressure in the annulus above the packer than in the isolated interval, thereby causing perforation at ''underbalanced'' conditions. A modified ''full-bore'' embodiment has an annular configuration firing mechanism as part of a tubing string and fires the perforating gun in response to development of a predetermined difference between the pressures at a point in the annulus and a point in the central bore of the tubing string.

• Assignee: Schlumberger Technology Corp.
• Patent Number(s): US 4560000
• OSTI ID: 5911443
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
DESIGN
DETONATIONS
DETONATORS
GUNS
NATURAL GAS WELLS
OIL WELLS
PACKINGS
PERFORATION
PRESSURE DEPENDENCE
PRESSURE GRADIENTS
RESERVOIR PRESSURE
WELL CASINGS
WELL PRESSURE
WELLS