Resources Contact Us Home
Firing head for a tubing conveyed perforating gun

Image Number 2 for United States Patent #4648470.

A firing head for a tubing conveyed perforating gun is shown which is operated by pressuring the interior of the tubing string. A sliding sleeve having a pressure responsive seal area changes position at a predetermined increase in tubing pressure. Movement of the sliding sleeve drains an initially filled, hydraulic cylinder within the interior of the tool. As the cylinder is drained, an associated fluid piston moves to occupy the evacuated chamber. The fluid piston is connected to a firing pin holder which releases the firing pin. Well annulus pressure acts through a port in the tool upon a pressure responsive seal area on the firing pin, thereby propelling the firing pin into a percussion detonator to fire the perforating gun.

  Recently Added Patents
Probe card holding apparatus with probe card engagement structure
Method for controlling operation of a wind turbine
Soybean cultivar BY0811143
Flash drive
Asset control in location tracking system
Network based technique for obtaining operator identifier for mobile devices
Light-source control device, light-source control method, image reading device, and image forming apparatus
  Randomly Featured Patents
Barrel and barrel base
Arrangement for the temporary storage of a yarn
Photoelectric conversion element
Heat exchange method for series flow reactors
GPS for communications facility records
Method and system for providing contents available on the internet to mobile handset
Needle guard, and assembly
Method of recovering medium or high gravity crude oil
Method and apparatus for printing zone print media edge detection
System compositing images from multiple applications