Expro’s new generation DST toolstring deployed in Gulf of Mexico
READING, United Kingdom -- Expro has deployed its new design ExACT (Expro Annulus-Operated Circulating and Test Tool) in its first live offshore well. The successful operation, a tubing conveyed perforating ‘shoot and pull’, took place on the Vermillion field offshore in the Gulf of Mexico following trial work onshore in Brazil last year.
The tool, one of the most advanced of its kind, combines downhole shut-in and circulating functionality. Rated at 15,000 psi and temperatures of up to 400°F, ExACT features minimal fast-cycling to position the ball and ports in the required position shortening times between cycles and therefore reducing cost.
A key aspect of the tool is its flexible application to fit with a range of downhole operational conditions and objectives. During the deployment, TCP guns were fired using a pressure-activated firing system set to detonate with 2,400-psi applied annulus pressure.
Using a bespoke in-house software program, the ExACT tool was set up at surface to fully function downhole with applied annulus pressure between 1,100 and 1,400 psi, leaving the desired firing head safety margin of 1,000 psi. Post-job analysis of gauge data verified that ExACT was operating within 50 psi of calculated values in all tool positions.
David Grant, Expro’s DST/TCP Director, comments, “The ExACT system can be deployed in any well type, however it is ideally suited for gas wells and deepwater markets. The fast-cycling tool can also provide a very high circulating rate, which is paramount in high cost operations, such as those in deepwater applications.”