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Industry Glossary Term

Legacy Well

An older well built to outdated standards that may require specialised remediation, abandonment, or workover services. Subcontractors should expect non-standard equipment configurations and additional compliance requirements. Scope creep and unforeseen costs are common on legacy well projects.

Related Terms

MOU (Memorandum of Understanding)

Industry

A non-binding agreement outlining the intent to work together before a formal contract is signed. Subcontractors use MOUs to secure preferred vendor status or reserve capacity for upcoming projects. They carry no payment guarantee, so avoid mobilising resources based solely on an MOU.

Self-Build

Industry

A project where the owner acts as their own general contractor, hiring subcontractors directly rather than through a prime contractor. For field service companies, this often means faster access to work but requires closer coordination with the owner. Payment terms and scope changes are negotiated directly, so clear contracts are essential.

Integrated Waterflood

Industry

A secondary oil recovery method where water is injected into a reservoir to maintain pressure and push oil toward production wells. Subcontractors support injection well drilling, pump installation, pipeline tie-ins, and ongoing facility maintenance. Scopes are often long-term, requiring sustained crew availability and specialised equipment.

Tie-In

Industry

A tie-in is the physical connection of new pipeline or equipment to an existing operational system. For subcontractors, tie-in work often requires strict scheduling around shutdowns and may involve additional safety and permitting requirements. Scope changes during tie-ins can affect billing, so clear change-order terms are essential.

Crane Mats

Industry

Large interlocked timber or composite panels placed under crane outriggers to distribute load on soft or unstable ground. Subcontractors often supply, transport, and install them as part of site prep scopes. Rental and mobilisation costs should be clearly itemised in your quote.

Dynamic Gas Blending

Industry

A real-time method of mixing gases at the wellsite to meet specific downhole pressure and composition requirements. Subcontractors operating blending equipment must hold current pressure vessel and gas handling certifications. Accurate blending logs are critical for compliance audits and client invoicing.

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