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Horizontal Concentric-Tube Gauge Disclosure Number: IPCOM000236819D
Publication Date: 2014-May-16
Document File: 4 page(s) / 199K

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The Smart and Intelligent Well tools and information management systems have been using permanent monitoring tools made up of quartz crystal based technology to detect downhole pressure and temperature. Recently, the oil industry has also been using fiber optic sensors that can detect temperature and pressure downhole. There has been an interest to re-develop and improve concentric tube technology that is used to measure and gauge pressure downhole. Traditional concentric tube gauges would have concentric chambers with annular space filled with helium gas. A control line filled with helium would be run to the surface. Gauges kept at the surface would be able to measure the pressure of either the annulus or tubing zone by measuring pressure experienced by helium gas. The re-development of concentric tube technology would focus on high temperature horizontal applications. To date, the only other gauges that can operate in the temperature extremes of the steam activated gravity drainage (SAGD) or cyclic steam simulation (CSS) environment are fiber gauges. However, fiber gauges have proven to be both unreliable and terribly expensive. Since concentric tube gauges have no moving parts and no electronics downhole, they have to temperature limits. Furthermore, the only parts of a concentric tube gauge that can fail are at the surface and can easily be replaced without intervention.

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Horizontal Concentric‐Tube Gauge 


The Smart and Intelligent Well tools and information management systems have been using permanent  monitoring tools made up of quartz crystal based technology to detect downhole pressure and temperature.  Recently, the oil industry has also been using fiber optic sensors that can detect temperature and pressure  downhole. There has been an interest to re‐develop and improve concentric tube technology that is used to  measure and gauge pressure downhole. Traditional concentric tube gauges would have concentric chambers with  annular space filled with helium gas. A control line filled with helium would be run to the surface. Gauges kept at  the surface would be able to measure the pressure of either the annulus or tubing zone by measuring pressure  experienced by helium gas.   

The re‐development of concentric tube technology would focus on high temperature horizontal applications. To  date, the only other gauges that can operate in the temperature extremes of the steam activated gravity drainage  (SAGD) or cyclic steam simulation (CSS) environment are fiber gauges. However, fiber gauges have proven to be  both unreliable and terribly expensive. Since concentric tube gauges have no moving parts and no electronics  downhole, they have to temperature limits. Furthermore, the only parts of a concentric tube gauge that can fail  are at the surface and can easily be replaced without intervention.  



The horizontal concentric tube gauge would be an enabling technology for steam injection valve. The oil industry  has realized that the steam injection valve is a valuable tool in their SAGD assets. They have also discovered that  downhole pressure gauges are essential to understand how to function the steam valves. Even if they were  reliable, the costs of fiber gauges in the completion can almost double the cost of the Intelligent Completion. A  horizontal concentric tube gauge would offer a solution that is not only bulletproof but would also offer substantial  savings. 

The traditional concentric tube gauges have two concentric chambers one inside the other. The annular space  would be filled with helium gas and at the bottom of the tube; there would be holes to let the well fluid enter this  annular region. The well fluid may enter from the production tube or from the annular space between the  concentric tube‐gauge and the casing the well. This would depend on which pressure that needs to be measured.  The well bore fluid entering the concentric tube‐gauge woul...