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IndustryGlossary Term

LWD (Logging While Drilling)

A drilling technique that collects formation data in real time as the bit advances. Subcontractors providing LWD services operate specialised downhole tools that transmit data to surface during the drill run. Mobilisation windows are tight, so crews and equipment must be ready on short notice.

Related Terms

SPP (Southwest Power Pool)

Industry

A regional transmission organisation managing the electrical grid across 14 U.S. states. Subcontractors working on power infrastructure, grid upgrades, or energy facilities in this region must align with SPP reliability standards. Understanding SPP's operating rules helps field crews coordinate outages and energisation schedules.

Gathering System

Industry

A network of pipelines, compressors, and facilities that collect hydrocarbons from wellheads and move them to processing points. Subcontractors frequently support construction, inspection, and maintenance work across these systems. Scopes can span remote multi-well pads, requiring strong logistics and crew coordination.

Ballast

Industry

Heavy material (water, sand, or concrete) added to vessels, structures, or equipment to improve stability and balance. In field operations, managing ballast affects load planning, marine logistics, and offshore platform work. Subcontractors on marine or offshore scopes must account for ballast systems in scheduling and safety planning.

Advanced Conductors

Industry

Large-diameter steel casings driven into the ground before main drilling begins to stabilise the wellbore and prevent surface collapse. Subcontractors involved in conductor installation, welding, or pile-driving work are typically mobilised in this early phase. Securing this scope early can anchor longer project commitments on a well site.

OD (Outer Diameter)

Industry

The measurement across the outside of a pipe, casing, or tubular component. Subcontractors use OD to specify compatible fittings, tools, and equipment on job sites. Mismatched ODs can cause costly delays and safety issues in the field.

Single-Scope Contract

Industry

A contract that limits a subcontractor to one defined service or trade, such as civil work or instrumentation. It prevents scope creep by clearly separating responsibilities between contractors. This structure helps subcontractors price accurately and avoid liability for work outside their expertise.

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