Method and apparatus for firing borehole perforating apparatus

Patent · Tue Sep 13 04:00:00 EDT 1988

OSTI ID:6804568

Ward, R M

This patent describes a method of firing a perforating gun disposed on a tubing string within a borehole, comprising the steps of: increasing the pressure within the tubing string to a predetermined pressure level; arming a firing assembly in response to the predetermined pressure increase level; moving an actuator toward the perforating gun after the firing assembly is armed; and delaying the firing of the perforating gun by a predetermined period of time during a first part of the actuator movement, the predetermined period of time being substantially independent of borehole temperature, and accelerating the actuator during a second part of the movement thereof for firing the perforating gun. Pressure actuated apparatus for firing a perforating gun disposed within a borehole, comprising: an elongated housing member; means associated with the housing member for arming the firing apparatus in response to a fluid pressure in the housing member; the arming means including a piston moveable in a fluid chamber and fixed to the housing member by a shear member which is shearable in response to the fluid pressure, a striker fixed to the piston and spring biased to move in a direction for firing the perforating gun.

• Assignee: Dresser Industries, Inc., Dallas, TX
• Patent Number(s): US 4770246
• OSTI ID: 6804568
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACTUATORS
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
FLOWMETERS
FLUID MECHANICS
HYDRAULICS
MEASURING INSTRUMENTS
MECHANICS
METERS
NATURAL GAS WELLS
OIL WELLS
OPERATION
PERFORATION
PIPES
PISTONS
TOOLS
WELL COMPLETION
WELLS