Application of the Wel-lok M2M™ technology for Completions
The engineers at BiSN have developed the unique core Wel-lok M2M™ technology to be specifically applied to the completions stage of the well. This is not a one tool does all solution, but a bespoke innovation which is adapted for annular sealing. Traditionally elastomer seals and cement have been used for decades to seal the annulus between casings. As many field engineers will testify, the elastomers and cement are known to have a high failure rate, having to be remediated using cement or resin squeezes. These are expensive, difficult and unreliable workovers.
The Wel-lok M2M™ TDAP (Thermally Deformable Annular Packer) is the new generation of metal to metal annular seals/packers. The alloy is placed in the well on the inner string during completion and is cemented into place. The unique BiSN design copes with the cementing process and still creates a gas tight metal to metal seal. After cementing the TDAP is set using a wireline activated chemical reaction heater, melting the alloy leaving a gas tight metal to metal seal. Due to the viscosity of the molten alloy being similar to water it will fill and seal the smallest of micro-annuli. The finished metal to metal seal is seamless.