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IndustryGlossary Term

Transmission Tie-in

A connection point where a new pipeline is joined to an existing high-pressure transmission system. Subcontractors typically handle welding, purging, and pressure testing during a planned outage window. Tie-in scopes often require strict scheduling coordination and certified welding procedures.

Related Terms

COR (Certificate of Recognition)

Industry

A voluntary safety certification program in Canada that recognizes employers who have developed health and safety management systems that meet established standards. Required by many operators in Alberta and Western Canada.

Directional Services

Industry

Specialised drilling support that steers a wellbore along a planned trajectory rather than straight down. Subcontractors provide MWD (Measurement While Drilling) tools, mud motors, and on-site directional drillers. These crews are typically mobilised on a per-well basis under dedicated service contracts.

Surface Miner

Industry

A large self-propelled machine that cuts, crushes, and loads material in a single pass without blasting. Subcontractors operating surface miners must hold specialised equipment certifications and follow strict site safety protocols. Common in oil sands and open-pit construction projects across Western Canada.

Custody Transfer

Industry

The formal handover point where ownership or responsibility for a measured quantity of oil, gas, or other product moves from one party to another — typically triggering billing, invoicing, or contractual obligations for subcontractors involved in metering, transport, or handling operations. Field service crews working custody transfer points must ensure measurements are accurate and fully documented, as discrepancies can directly affect client invoices and liability.

Cavern Infrastructure

Industry

Underground storage facilities, typically salt caverns, used to store hydrocarbons like natural gas or crude oil. Subcontractors may be engaged for cavern construction, well drilling, piping, and surface facility work. Projects often involve specialised equipment and compressed timelines tied to storage demand cycles.

Sanctioned Field

Industry

A field development that has received formal investment approval from the operator or project owner. For subcontractors, sanction signals that contracts, mobilisation, and work orders are imminent. It marks the transition from planning to active field execution.

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