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IndustryGlossary Term

OFS (Oilfield Field Services)

The sector of companies and subcontractors that provide specialised labour, equipment, and technical services to oil and gas operators. This includes drilling, completions, maintenance, and production support work. Most field subcontractors operate within the OFS sector, working under Tier 1 service companies or directly for operators.

Related Terms

ROP (Rate of Penetration)

Industry

ROP measures how fast a drill bit advances through rock, usually in metres per hour. Subcontractors use it to estimate job duration and crew scheduling. Faster ROP can mean shorter contracts but higher equipment wear costs.

Caisson

Industry

A watertight steel or concrete structure used to support foundations in offshore or waterlogged environments. Subcontractors may be scoped to install, inspect, or perform maintenance work on caissons. Access and confined space protocols often apply.

Lifecycle-Based Approach

Industry

A method of planning services, maintenance, or contracts around the full lifespan of an asset or project phase. Subcontractors use it to align scopes of work, pricing, and resource deployment from mobilisation through decommissioning. This helps avoid scope gaps and supports longer-term service agreements.

BIM (Building Information Modelling)

Industry

A shared 3D digital model of a construction project that contains structural, mechanical, and site data. Subcontractors use it to coordinate work sequences, avoid clashes with other trades, and verify installation specs before mobilising. Access to the BIM model is often required before entering a worksite.

Voltage Conversion

Industry

The process of changing electrical supply from one voltage level to another using transformers or converters. Field crews must verify site voltage specs before mobilising equipment to avoid damage or downtime. Mismatched voltage is a common cause of costly equipment failures on remote job sites.

Bladder Tank

Industry

A collapsible, flexible fluid storage container used on job sites to hold fuel, water, or chemicals. Subcontractors often mobilise them where permanent tanks aren't practical. They're common on remote oil and gas and construction sites.

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