Orifice Float Collar

For India and Iran Only
A Liner Extension Assembly allows an existing Liner with a receptacle to be extended to the surface or farther up hole. The assembly consists of a seal Nipple and an Orifice Collar. The Seal Nipple is run at the bottom of the Extension casing. The Tieback Receptacle (TBR) is usually run as an integral part of the liner top packer or Setting Collar and at Liner top. It has special surfacefinish so as to provide a positive sealing bore for the seal nippleassembly during tubing string expansion and/or contraction in response to pressure and temperature. The Polish Bore Receptacle provides the maximum integral opening through the production tubing and sealing system. The TBR Seal Nipple is the second part of the Tie back system and provides a unitized seal assembly on a stem which connects to the end of tubing or casing string and to successfully create a packer less free end tubing to casing seal. When used in un-cemented or frac applications the seal integrity is maintained allowing tubing to expand and contract in response to pressure and temperature differences without affecting the integrity of the tubing to casing seal. Typically a series V-ring (or Chevron) seal stacks are assembled on the seal nipple mandrel and separated by spacer rings. A Polish Mill is run before to clean out TBR. For cemented Tieback applications, the TBR Seal Nipple is combined with a stage collar or ported put and an orifice float collar. The orifice float Collar is designed with small diameter drilled hole through the float valve to allow fluid by-pass and preventing hydrauliclock as the seal nipple stabs into the TBR after cement is in place. Orifice Collar is positioned one joint above the Seal Nipple. This prevents hydraulic blockage as the seal is engaged in the receptacle and allows the Liner Extension to fill at a predetermined rate as it is run. The Orifice Collar also serves as a stopper for the cement plug.Designed to match the size, weight and grade of the liner tieback string.Incorporates a conventional Super Seal II valve assembly with a poppet valve that incorporates an orifice flow port that allows pre-cementing pressure test to be performed on the TBR and stinger.