A heavy, telescoping steel rod that transmits rotary torque from a drill rig to the auger or cutting tool. Subcontractors operating foundation or piling rigs must inspect kelly bars regularly for wear and cracking. Damage affects drilling performance and can cause costly downtime on tight project schedules.
Kelly Bar
Related Terms
Derivative Goods
IndustryProducts created by processing or transforming raw materials supplied under a contract, such as fabricated components or treated fluids. Subcontractors must clarify ownership rights over derivative goods before work begins. Contracts often assign these rights to the prime contractor or client by default.
Multi-Trade Pipeline
IndustryA project requiring multiple specialised trades — such as welders, pipefitters, and electricians — deployed in sequence or simultaneously. Subcontractors must coordinate closely to avoid schedule conflicts and delays. Winning work on these projects often requires demonstrating multi-discipline capacity to the prime contractor.
Geothermal Brine
IndustryHighly mineralised, hot saltwater extracted from underground geothermal reservoirs during energy production. Subcontractors handling it must follow strict corrosion control and PPE protocols. Disposal and handling are heavily regulated due to its chemical content.
LNG (Liquefied Natural Gas)
IndustryNatural gas cooled to -162°C to become liquid for easier transport and storage, creating specialized work opportunities for subcontractors in cryogenic equipment maintenance, pipeline construction, and terminal facilities that require specific safety certifications and cold-weather expertise.
Throughput
IndustryThe volume of work or units a crew completes within a set timeframe. Higher throughput means more billable output per shift, directly affecting your contract profitability. Subcontractors often track throughput to justify crew sizes and equipment needs.
Well Testing
IndustryA series of controlled flow and pressure measurements performed on a newly drilled or existing well to evaluate its production potential and reservoir characteristics; for subcontractors, this work often involves deploying and operating specialised equipment such as separators, flowback units, and data acquisition systems under tightly scheduled, high-priority conditions.
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