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Alternate Procedures to Hang Velocity String to Enhance Production in Gas Wells

IP.com Disclosure Number: IPCOM000239598D
Publication Date: 2014-Nov-18
Document File: 3 page(s) / 130K

Publishing Venue

The IP.com Prior Art Database

Abstract

The application of installing reduced size concentric tubing to reduce the effective flow area to increase the flow velocity to increase production is common. Earlier it was established by hanging of coiled tubing from the surface which resulted in wastage of coil. In this application we are describing the method to hang velocity string at a certain depth above the kick off point to be more efficient. These are for oil and gas wells, which suffer from declining reservoir pressure and increased water production causing liquid to accumulate at the bottom of the well and exert back pressure on the formation. This restricts or in some cases prevents fluid entry into the wellbore from the formation. In South Texas, some are not doing the Coil Tubing Clean Out prior to installing velocity string. Due to this, if velocity string is hanged, then there is a possibility of getting plugged by shale debris and milled composite plug debris. Run specific length of coiled tubing in well and then rig down lubricator to cut coil on surface. This configuration has Rupture Disc Sub (or Ceramic disc sub) and Slotted Liner w/ Bull Plug at bottom installed in the bottom of the coil tubing for well control. Make up either an invertible packer or Lock and adapter sub to the cut coil and run in hole with a setting/running tool to either set the packer or lock. Release setting/running tool. Pressure up to rupture the disc or ceramic in the sub from the coil to regain wellbore communication. The slotted liner below the Rupture Disc Sub or the Ceramic Disc Sub have staggered slots and has a predetermined calculated flow area that allows the production but doesn't let the debris to enter the velocity string.

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Alternate Procedures to Hang Velocity String to Enhance Production in Gas Wells

The application of installing reduced size concentric tubing to reduce the effective flow area to increase the flow velocity to increase production is common.  Earlier it was established by hanging of coiled tubing from the surface which resulted in wastage of coil.  In this application we are describing the method to hang velocity string at a certain depth above the kick off point to be more efficient.  These are for oil and gas wells, which suffer from declining reservoir pressure and increased water production causing liquid to accumulate at the bottom of the well and exert back pressure on the formation.  This restricts or in some cases prevents fluid entry into the wellbore from the formation.  In South Texas, some are not doing the Coil Tubing Clean Out prior to installing velocity string.  Due to this, if velocity string is hanged, then there is a possibility of getting plugged by shale debris and milled composite plug debris.

Run specific length of coiled tubing in well and then rig down lubricator to cut coil on surface.  This configuration has Rupture Disc Sub (or Ceramic disc sub) and Slotted Liner w/ Bull Plug at bottom installed in the bottom of the coil tubing for well control.  Make up either an invertible packer or Lock and adapter sub to the cut coil and run in hole with a setting/running tool to either set the packer or lock.  Release setting/running tool.   Pressure ...