The formal point when a drilling rig is demobilised and the operator ends the rig contract. For subcontractors, it signals the close of associated scopes of work and triggers final invoicing. Crew demob, equipment retrieval, and close-out documentation should begin immediately.
Rig Release
Related Terms
CCUS (Carbon Capture, Utilization, and Storage)
IndustryTechnology that captures CO₂ emissions from industrial sites and either stores or repurposes them. Subcontractors are increasingly hired to build, maintain, and service CCUS infrastructure. Familiarity with these projects opens doors to growing work in emissions-reduction programmes.
Viaduct
IndustryA long elevated bridge structure carrying roads or pipelines over valleys, water, or rough terrain. Subcontractors working near viaducts must account for access restrictions and specialised rigging requirements. Inspection and maintenance contracts on viaducts often require working-at-heights certification.
Reactivation
IndustryThe process of bringing a dormant well, pipeline, or piece of equipment back into active service, often requiring subcontractors to mobilise crews, conduct inspections, and complete compliance checks before full operations can resume. For field service companies, reactivation work can represent a significant surge in contract opportunities, particularly during periods of rising commodity prices.
PWHT (Post-weld Heat Treatment)
IndustryA controlled heating and cooling process applied to welds after completion to reduce stress and improve strength. Subcontractors must confirm PWHT requirements before mobilising, as it adds time, equipment, and certified personnel to scope. Failing to price it into your bid can significantly erode job margins.
TVD (True Vertical Depth)
IndustryThe straight-line vertical distance from surface to a specific point in a wellbore, regardless of how the well is drilled — subcontractors working on directional or horizontal wells need to reference TVD (not measured depth) when scoping equipment reach, calculating hydrostatic pressures, or verifying work zone depths on service orders.
KPI (Key Performance Indicator)
IndustryA measurable target used to evaluate a subcontractor's performance on safety, productivity, or quality. Clients track KPIs to assess contract compliance and award future work. Common field KPIs include incident rates, on-time mobilisation, and equipment uptime.
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