These hardened knuckles have a variable displacement distance that allows for flexibility in correcting the annulus along the wellbore. CET allows for quick completion of the crimping cycle and easy movement to the next location. Multiple crimps should be inserted at target depth intervals to fully eradicate all micro-annulus and backside gas flow problems.
You may be wondering how this new technology works. It’s surprisingly simple.
The metal fingers at the tip of the nozzle are mechanically separated by the actuated cone, causing them to forcefully expand into the existing cement and apply a squeezing pressure on the casing locally. This pressure on the cement causes the casing to swell, extending into the micro-annulus and effectively inserting a crimp that closes any gaps or small channels.
While a traditional squeeze technique creates these same crimps, the CET uses an electric line and is a one-run tool, which achieves the same result at a fraction of the cost and effort.
This tool also significantly eliminates the safety concerns for workover operations. Operating crews can work from the surface, in much safer conditions and without having to deal with escaping gas.
CET also increases the safety of wells marked for Plug and Abandon. Due to a lack of economic pressures at the end of a well’s lifecycle, it’s unfortunately too common to see wells abandoned. There is a risk to the public when pressure builds up, which is why CET is the technology of choice for scheduled Plug and Abandons. It is a cost-effective means to safely Plug and Abandon a well to ensure that no gases will escape and pose any risk to the public.
CET also has great potentials in other areas of the well construction process. A promising new application for the CET is in the whipstock stage. It takes lots of time and money to conduct whipstock operations properly, which has led to some crews speeding up the process too quickly and not giving cement enough time to dry or bonds to form between the formation wall.