초록 ▼

A well perforator system and method employs an electromagnetic wave frequency receiver, one for each of at least two gun intervals, that receives a transmitted signal conveyed through well tubing from the earth\s surface. The signal is converted to an electrical pulse which detonates a blasting cap

A well perforator system and method employs an electromagnetic wave frequency receiver, one for each of at least two gun intervals, that receives a transmitted signal conveyed through well tubing from the earth\s surface. The signal is converted to an electrical pulse which detonates a blasting cap and fires the gun perforators. Each gun interval is a separate system with different activating frequencies and each is separately activated to assure that all the intervals are fired. A timer may be used to activate the electromagnetic wave receiver after the gun is in the well to prevent accidental surface firing of the guns from stray sources of electromagnetic waves. Once in the well, only the transmitted pulses are able to detonate the guns. Once the last interval is fired, a wave frequency-activated gun above the uppermost gun interval is detonated with circulation shots to penetrate only the tubing. This creates an instant, intense pressure drop across the perforations to help in cleanup. Once the pressure equalizes, a casing cutter can be lowered down the well to cut the guns off and have them dropped to bottom. A microphone may be positioned at the earth\s surface to detect firing of the guns.

대표청구항 ▼

A method for firing sequentially at least two vertically spaced-apart perforator guns connected to the lower end of tubing suspended in a well to perforate subsurface intervals surrounding said well comprising the steps of: transmitting from the earth\s surface electromagnetic waves having selected

A method for firing sequentially at least two vertically spaced-apart perforator guns connected to the lower end of tubing suspended in a well to perforate subsurface intervals surrounding said well comprising the steps of: transmitting from the earth\s surface electromagnetic waves having selected frequencies down said tubing to detonate the charges of one of said perforator guns in response to said selected frequencies; and transmitting second electromagnetic waves having second different selected frequencies down said tubing to detonate the charges of a second of said perforator guns in response to said second selected frequencies.