The formal point when a drilling rig is demobilised and the operator ends the rig contract. For subcontractors, it signals the close of associated scopes of work and triggers final invoicing. Crew demob, equipment retrieval, and close-out documentation should begin immediately.
Rig Release
Related Terms
Long-Lead Items
IndustryEquipment or materials requiring extended procurement timelines, often months ahead of project start. Subcontractors must identify these early to avoid costly schedule delays. Late orders can stall mobilisation and trigger liquidated damages clauses.
Throughput
IndustryThe volume of work or units a crew completes within a set timeframe. Higher throughput means more billable output per shift, directly affecting your contract profitability. Subcontractors often track throughput to justify crew sizes and equipment needs.
Umbilicals, Risers, and Flowlines
IndustryCollectively referred to as URF, these are the subsea infrastructure components that connect wellheads to production facilities — umbilicals carry control fluids and signals, risers bring production to surface, and flowlines move product along the seabed — subcontractors are commonly engaged for their installation, inspection, maintenance, and integrity management work. Understanding the distinctions between these systems helps field crews accurately scope work orders, apply correct certifications, and bill against the right line items in offshore or subsea contracts.
Tubulars
IndustrySteel pipes used in drilling and well construction, including casing, tubing, and drill pipe. Subcontractors handling tubulars must follow strict inspection and handling procedures. Damage during your scope can result in costly liability claims.
2c Resources
IndustryThe middle estimate of contingent petroleum resources that are discovered but not yet approved for development. For subcontractors, 2C resource announcements often signal future project opportunities that are not yet fully funded. Bid opportunities tied to 2C resources carry higher uncertainty and may shift significantly before contracts are awarded.
Horizontal Well
IndustryA well that is drilled vertically to a certain depth then curved to run horizontally through a target formation, requiring subcontractors to mobilise specialised equipment and crews for extended-reach drilling, completions, and stimulation work that typically involves more complex logistics and longer on-site durations than conventional vertical wells.
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