US2012018156A1PendingUtilityA1

Gas cushion near or around perforating gun to control wellbore pressure transients

37
Individually held — no corporate assignee on recordPriority: Jun 22, 2010Filed: Jun 21, 2011Published: Jan 26, 2012
Est. expiryJun 22, 2030(~3.9 yrs left)· nominal 20-yr term from priority
Inventors:Brenden M. GroveJeremy P. Harvey
E21B 43/1195E21B 21/085E21B 23/0417
37
PatentIndex Score
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Claims

Abstract

A method for perforating a formation material proximate to a wellbore involving lowering a perforating gun string comprising a perforating gun and a gas-generating device downhole, providing wellbore fluid around the perforating gun, and providing a volume of gas proximate the perforating gun, by the gas-generating device, wherein the volume of gas is configured to reduce the shock produced upon firing of the perforating gun.

Claims

exact text as granted — not AI-modified
1 . A method for perforating a formation material proximate to a wellbore, comprising:
 lowering a perforating gun string comprising a perforating gun and a gas-generating device downhole;   providing wellbore fluid around the perforating gun; and   providing a volume of gas proximate the perforating gun, by the gas-generating device, wherein the volume of gas is configured to reduce the shock produced upon firing of the perforating gun.   
     
     
         2 . The method of  claim 1 , wherein firing the perforating gun comprises:
 detonating a plurality of shaped charges in the perforating gun.   
     
     
         3 . The method of  claim 1 , wherein the gas-generating device is positioned below the perforating gun on the perforating gun string. 
     
     
         4 . The method of  claim 3 , further comprising:
 actuating the gas-generating device, wherein the gas-generating device is actuated by one selected from a group consisting of: automatically, during lowering of the perforating gun downhole, and manually, using a control signal sent from a surface device to the gas-generating device.   
     
     
         5 . The method of  claim 3 , wherein the gas-generating device is one selected from a group consisting of a propellant device, a high-pressure tank, a stored gas accumulator, a liquid CO 2  generating cylinder device, and a slow bladder inflator. 
     
     
         6 . The method of  claim 1 , wherein the volume of gas comprises gas bubbles surrounding the perforating gun. 
     
     
         7 . The method of  claim 1 , wherein the volume of gas is an accumulation positioned directly above the perforating gun. 
     
     
         8 . The method of  claim 1 , wherein the volume of gas completely surrounds the perforating gun. 
     
     
         9 . The method of  claim 1 , wherein the volume of gas provided is proportional to a size of the perforating gun. 
     
     
         10 . The method of  claim 1 , wherein the volume of gas is configured to increase fluid compressibility in the wellbore, resulting in reducing sudden changes to wellbore pressure transients. 
     
     
         11 . The method of  claim 1 , wherein the volume of gas is introduced by the gas-generating device immediately before detonation of the perforating gun. 
     
     
         12 . A perforating gun system for perforating a formation material proximate to a wellbore, comprising:
 a perforating string comprising a perforating gun, wherein the perforating string is lowered into the wellbore; and   a gas-generating device operatively connected to the perforating string and configured to introduce a volume of gas proximate to the perforating gun, wherein the volume of gas is configured to reduce the shock produced upon firing of the perforating gun.   
     
     
         13 . The perforating gun system of  claim 12 , wherein the gas-generating device is positioned below the perforating gun on the perforating gun string. 
     
     
         14 . The perforating gun system of  claim 12 , wherein the gas-generating device is one selected from a group consisting of a propellant device, a high-pressure tank, a stored gas accumulator, a liquid CO 2  generating cylinder device, and a slow bladder inflator. 
     
     
         15 . The perforating gun system of  claim 12 , wherein the volume of gas is introduced when the gas-generating device is actuated by one selected from a group consisting of: automatically, during lowering of the perforating gun string downhole, and manually, using a control signal sent from a surface device to the gas-generating device. 
     
     
         16 . The perforating gun system of  claim 12 , wherein the volume of gas completely surrounds the perforating gun. 
     
     
         17 . The perforating gun system of  claim 12 , wherein the volume of gas provided is proportional to a size of the perforating gun. 
     
     
         18 . The perforating gun system of  claim 12 , wherein the volume of gas is configured to increase fluid compressibility in the wellbore, resulting in reducing sudden changes to wellbore pressure transients.

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