Tieback

Occupational Safety and Health Administration. The US federal agency responsible for workplace safety regulations. Compliance with OSHA standards is required for contractors working in the United States.

The number of drilling rigs actively operating in a region. Published weekly by Baker Hughes, the rig count is a leading indicator of activity levels in the oil and gas industry.

The upstream segment of the oil and gas industry covering the search for and extraction of hydrocarbons, representing the primary client base that hires field service subcontractors for drilling, completions, well servicing, and site construction work. Understanding whether a client operates in E&P helps subcontractors anticipate project cycles, budget timing, and the boom-and-bust demand patterns that directly affect contract volumes and payment schedules.

The 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.

When a well or piece of production equipment is temporarily halted or taken offline, often resulting in subcontractors being demobilised or placed on standby with reduced or suspended billable hours until operations resume.

A project delivery model where one main contractor handles all phases from design to completion, typically creating multiple subcontracting opportunities for field service companies across different project phases. For subcontractors, EPC projects often mean working under a prime contractor who coordinates all trades and manages the overall timeline and specifications.