Easement

A timeline that outlines when specific tools, equipment, or crews are deployed downhole or on-site during an operation, dictating when a subcontractor's services are required and for how long. For field service companies, the run schedule directly determines mobilisation timing, crew rotations, and invoiceable hours on location.

Specialty chemicals injected into wells and pipelines to control corrosion, scale, paraffin, and hydrates during oil and gas production. Subcontractors handle storage, injection system maintenance, and chemical dosing as part of production operations contracts. Proper handling certifications and spill containment protocols are typically required on-site.

A delivery model where a construction manager guarantees a maximum project cost and takes on financial risk if it's exceeded. Subcontractors are hired by the CM, not the owner, making the CM your direct client and contract holder. Your scope, payments, and change orders all flow through the CM.

A technical document outlining the planned scope, procedures, and specifications for drilling or completing a well. Subcontractors use it to understand required services, equipment, and sequencing before mobilising. It directly affects how you scope work and price your bid.

Systems that use compressed air or gas to power tools, actuators, and control valves on job sites. Subcontractors working with pneumatic equipment must ensure proper pressure ratings and fittings are maintained. Common in instrumentation, pipeline, and heavy construction scopes.

The collection of drilling tools and equipment at the bottom of the drill string, including the drill bit, drill collars, stabilizers, and downhole motors. For drilling subcontractors, BHA configuration directly impacts drilling performance, tool wear rates, and operational efficiency.

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.