IMR (Inspection, Maintenance, and Repair)

A pipeline or flow line system that connects a new offshore wellhead or satellite field back to an existing production facility or platform, allowing operators to develop remote reserves without building standalone infrastructure. For subcontractors, tiebacks often involve specialised subsea installation, inspection, and maintenance scopes that require certified divers, ROV crews, or subsea engineering support.

A standardised unit of energy measurement that converts different types of oil and gas production into equivalent barrels of crude oil, used by operators to report total production volumes when determining project scope and service requirements for subcontractors.

The date when drilling begins on a new well. Marks the start of drilling operations.

The company that holds the rights to develop an oil and gas property and manages day-to-day operations. Operators hire subcontractors and service companies to perform various tasks.

A network of underwater equipment — including wellheads, manifolds, flowlines, and control systems — installed on the seabed to extract and transport oil or gas to a surface facility, representing a specialised scope of subsea installation, inspection, and maintenance work that subcontractors must hold specific certifications and equipment to perform. For field service companies, contracts in this space typically involve saturation diving support, remotely operated vehicle (ROV) operations, or subsea engineering services under strict offshore safety and quality regimes.

A budgeting document used in oil and gas projects that outlines expected costs and seeks approval before work begins. Subcontractors often work under AFEs issued by operators.