A 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.
Viaduct
Related Terms
GWD (Getting Work Done)
IndustryA safety and compliance management system used by some operators to pre-qualify and manage contractors working on their sites.
Operator
IndustryThe company that holds the rights to develop an oil and gas property and manages day-to-day operations. Operators hire subcontractors and service companies to perform various tasks.
Crown Land Sale
IndustryA government auction where energy companies bid on licences to explore or develop publicly owned land. Winning bids signal upcoming drilling and field activity in that area. Subcontractors watch these sales to anticipate new work and mobilise resources early.
Pressure Pumping
IndustryA well stimulation service involving the high-pressure injection of fluids — such as fracturing fluid, cement, or acid — into a wellbore to improve production or complete the well; for subcontractors, it represents a specialised, equipment-intensive scope of work that typically requires certified operators, dedicated pump trucks, and close coordination with the primary operator on site.
Tieback
IndustryA structural anchor or connection point used to secure equipment, pipelines, or wellheads back to an existing infrastructure system, commonly referenced in subcontractor scopes of work when connecting new installations to live or existing lines. Subcontractors should confirm tieback specifications and isolation procedures clearly in their contracts, as this work often involves elevated risk and may require additional certifications or permits.
Master Service Agreement (MSA)
IndustryA contract between an operator and a service company that establishes the general terms and conditions for all future work. Individual jobs are then executed under work orders or AFEs referencing the MSA.
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