Applications
In September 2022, Coretrax supported an 8 well P&A campaign for an operator, in the Central North Sea. Over the 8 wells Coretrax provided multiple solutions for the placement of the environmental cap on each well, utilising both Coretrax packers, plugs and retainers, and Lee Energy System’s Gator Tool. During one of the wells, a single trip double perforation and cement squeeze was performed using the CX-2 cement plug, the CX-RTP (Retrievable Test Packer) and the Lee Energy Gator hydraulic perforating tool.
2 wells included a 1 trip systems to install reservoir barriers.
Historically, these perforations were made using down hole guns, but the Gator Tool System achieves these perforations using hydraulic pressure cycles, removing the requirement to manage explosives completely. By collaborating with Lee Energy Systems, Coretrax were able to achieve a one trip systems, underpinning our commitment to provide rig time savings for the operator whenever possible.
Solution and Achievement
This single trip system, consisting of a CX-2 Bridge Plug, Gator perforating tool and components, a drop ball circulation sub and a CXRTP was run in on 5 1/2" pipe into the 9 5/8" 53.5# casing. The CX-2 was set, released and pressure tested at 3,810 ft. The string was then picked up to 2,720 ft and the Gator tool was functioned to hydromechanically perforate, achieving 4 radial perforations, 90 degrees apart to ensure good radial coverage at and then again at the lower perforation area at 3,780 ft. The perforations have a large TFA and push out into the outer annulus, helping the centralize the casing for more effective annular cement displacement. The CX-RTP was then set at 3,760 ft and circulation was then confirmed through the perforations using the B annulus. After confirmation of the circulation path, the drop ball circulation sub was opened to isolate the Gator tool below and cement was pumped and squeezed into the perforated outer / B annulus. After the cement was pumped and displaced, the CX-RTP was released, and the string retrieved to surface. The cement left on top of the CX-2 in the casing was later successfully tagged and subsequently pressure tested.
