Vacuum Excavation (vac-Ex)

A 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.

A formal document issued by a client or general contractor authorising a subcontractor to perform a specific scope of work. It outlines the job details, location, timeline, and agreed rate. Subcontractors typically cannot invoice without a valid work order number.

A structured programme for inspecting, maintaining, and documenting assets to ensure they remain safe and operational. Subcontractors are often hired to perform integrity work such as corrosion inspection, NDT, and pipeline assessments. Accurate recordkeeping is critical, as clients and regulators require full audit trails.

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.

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.

The evaluation of reservoir rock and fluid properties using well log data and core samples. Results determine whether a well is worth completing, directly affecting drilling programme scope and subcontractor workload. Field crews support this work through wireline logging, coring, and fluid sampling operations.

How Operator Mergers and Acquisitions Affect Your Subcontract Agreements

When operators merge, get acquired, or sell assets, subcontractor agreements are caught in the middle. Learn how M&A activity affects your MSA, payment terms, vendor status, and what to do before, during, and after a deal closes.

How Rig Count Trends Affect Subcontractor Demand and What to Do About It

Rig counts are the earliest signal of where field service work is heading. Learn how to read drilling activity trends, anticipate demand shifts, and position your crew before the phone stops ringing.

What Is an AFE in Oil and Gas and How Does It Affect Subcontractor Payments?

An AFE (Authorization for Expenditure) controls every dollar spent on an oilfield project. Learn how it affects your billing, change orders, and cash flow as a subcontractor.