Well Abandonment with Wel-lok™ STC
This well had previously been abandoned by circulating a cement balance plug through perforations in 4 ½” tubing into a 7” production casing. The well continued to build gas pressure at surface through the production tubing and casing.
Traditional methods of circulating cement balance plugs does not generate a gas tight seal. In order to continue with the abandonment of the well, the operator needed to ensure the well was free of pressure and gas in order to cut and pull the production tubing.
The production tubing was perforated and a Wel-lok™ STC was set in the well to provide a gas tight seal in the tubing and casing.
An initial pressure test of 4,000 psi was performed, followed by a successful negative pressure test which resulted in no bubbles or gas pressure at surface. Further, this well underwent a 1-year monitoring period prior to resuming the well abandonment, resulting in no bubbles or gas pressure build up over this period.
The Wel-lok™ STC (Seal Through Casing) has been developed to achieve a gas tight V0 seal well annuli that cannot be achieved by traditional cement balance plugs. Run on electric line, this tool does not need surface pumping equipment to circulate the alloy in place. Due to its viscosity and density, once melted the liquid alloy will flow with gravity into the annulus. When it cools below its melting point it solidifies, expands and creates a gas tight seal across the entire wellbore. The entire process, from melting to solidification, takes place in minutes and the seal is ready to test within an hour.
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