Wellhead maintenance + slickline
Upper Master Valve Actuator failure
A serious actuator failure found during routine wellhead maintenance, with an OEM parts wait of 60–90 days minimum.
01Problem
Routine wellhead maintenance on a UK client location identified a serious failure on the upper master valve actuator.
When the actuator was dis-assembled, a number of component parts showed severe galling and thread damage beyond repair. The OEM advised a 60–90 day minimum waiting time for parts — meaning 3–4 months with the well offline and losing production.
02Action
A work plan combined HG Wells Slickline and Wellhead Maintenance services using a multi-skilled intervention team covering all the required competencies, so the well could be made safe and ready for valve / actuator maintenance.
HG Wells plugged the well by installing a downhole plug and installed a BPV in the tubing hanger, then removed the actuator.
HG Wells engaged a qualified oil & gas sector engineering company to reverse engineer the damaged components in 14 days. The actuator was then assembled and tested by HG Wells workshop technicians.
03Outcome
The tested actuator was supplied to the client location. The HG Wells multi-skilled crew installed it, confirmed the Upper Master Valve on the Xmas Tree was operational and tested, then removed the BPV and downhole plug — returning the client well to production.







