Workovers & Interventions

Operational management at GST ensures effective on-site supervision of well services, interventions, and workover operations. Each project is led by a Site Supervisor, supported by a Well-Site Engineer where appropriate, while our back-office team including engineers and a project/ drilling manager oversees and coordinates the operation from the office.

Effective on-site supervision is essential to delivering safe, on-time, and cost-controlled operations. Acting as the client’s eyes and ears on location, the Site Supervisor ensures clear, consistent communication between all parties, including the client, GST back-office team, contractors, and key stakeholders.

Our experienced pool of supervisors offers clients continuity, flexibility, and confidence in execution. Supervisors are entrusted with the authority to manage unforeseen situations on-site, maintaining safety, control, and progress. Any deviations are escalated in a timely and transparent manner, supported by a robust Management of Change (MoC) process coordinated by our back-office team and when necessary, involving regulatory authorities.

We deliver hands-on support across workovers, well interventions, and lifecycle services, from routine maintenance to complex integrity and late-life operations. The services below outline how we support our clients in the field throughout the life of the well:

• Production phase workovers – intervention to optimize production, control risks and extend productive well life by means of tie-back installations, ESP change-outs, sand control repairs, and the installation of temporary or permanent plugs to isolate problem zones.
• Integrity-driven workovers – comprehensive downhole logging operations, including advanced casing integrity and wall thickness analysis using mechanical, acoustic, or electromechanical measurement techniques. Includes casing and tubing leak repairs, as well as wellhead and tree maintenance.
• Plug and abandonment (P&A) workovers – the final phase of the lifecycle, focusing on permanently securing the well and restoring the well site. Activities include setting permanent cement plugs, installing mechanical barriers, cutting and pulling casing, removing the wellhead, verifying barrier integrity, and completing site restoration.