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IndustryGlossary Term

Prime Contractor

The main company awarded a project contract who then hires subcontractors to perform portions of the work. As a sub, your agreement, invoicing, and compliance obligations flow through them—not the end client. They carry overall site liability and typically control scheduling and scope.

Related Terms

Retrieval System

Industry

A retrieval system is a method or tool used to recover equipment, tools, or materials from a wellbore or work site. Subcontractors may be responsible for operating or maintaining retrieval systems during fishing jobs or abandonments. Proper handling affects both project timelines and liability.

Pipeline Integrity

Industry

The ongoing process of ensuring pipelines remain safe, structurally sound, and compliant with regulatory standards. Subcontractors are frequently hired for inspection, maintenance, and repair work tied to integrity programmes. Scopes can include ILI (Inline Inspection), coating repairs, hydrotesting, and fitness-for-service assessments.

PWHT (Post-weld Heat Treatment)

Industry

A 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.

Frac Campaign

Industry

A scheduled series of hydraulic fracturing operations across multiple wells or stages within a defined period, representing a concentrated burst of work that subcontractors must plan for with adequate crew, equipment, and supply chain capacity. For field service companies, winning a spot in a frac campaign can mean weeks of steady, high-volume work but also demands tight mobilisation timelines and the ability to scale up quickly.

Grid Modernization

Industry

The large-scale upgrading of electrical infrastructure to support smart technologies, renewable integration, and improved reliability. For subcontractors, it drives demand for specialised installation, maintenance, and inspection work. Crews may be deployed on projects ranging from substation upgrades to smart metre rollouts.

GWD (Getting Work Done)

Industry

A safety and compliance management system used by some operators to pre-qualify and manage contractors working on their sites.

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