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Industry Glossary Term

Secondary Stress

Indirect mechanical stress that develops in structures or piping due to thermal expansion, settlement, or equipment movement. Unlike primary stress, it isn't caused by direct applied loads. Subcontractors must account for it during installation and inspection to avoid material fatigue and warranty disputes.

Related Terms

Geothermal Well Testing

Industry

A process used to measure heat output, flow rates, and pressure in geothermal wells. Subcontractors provide specialised testing equipment, instrumentation crews, and data logging services. Work often involves high-temperature conditions requiring specific safety protocols and certified equipment.

Leasehold

Industry

Land or mineral rights an operator has legally secured through a lease agreement with the landowner or Crown. Subcontractors typically work within leasehold boundaries, so access, permitting, and site rules are set by the operator holding the lease. Understanding leasehold limits helps crews avoid trespassing on adjacent unlicensed areas.

Infill Drilling

Industry

Drilling new wells between existing producers to recover bypassed reserves in a developed field. For subcontractors, it means shorter mobilisation windows and back-to-back well programmes. Expect high crew utilisation but tight scheduling with little downtime between jobs.

Upstream

Industry

The segment of the oil and gas industry involved in exploration and production (E&P). Includes drilling, completions, and well operations.

Grade Separation

Industry

A crossing where a road, pipeline, or utility passes over or under another route using a bridge or culvert. Subcontractors must account for grade separations when planning equipment moves and material hauls. Permits and escort requirements often apply when loads approach clearance limits.

Master Service Agreement (MSA)

Industry

A 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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