A urea-based solution injected into diesel exhaust systems to reduce harmful emissions on Tier 4 equipment. Subcontractors must keep adequate DEF on-site, as running out triggers engine derate or shutdown. Factor DEF supply and storage into your remote site logistics planning.
DEF (Diesel Exhaust Fluid)
Related Terms
Rotary Rig Count
IndustryA weekly tally of active drilling rigs operating across a region, published by companies like Baker Hughes. Subcontractors use it to gauge market demand and anticipate work volumes. A rising count typically signals increased opportunities for drilling-related field services.
Electrohydraulic (eh) Control System
IndustryA control system combining electrical signals and hydraulic power to operate valves, actuators, and process equipment. Subcontractors working on commissioning or maintenance must be qualified to work on both electrical and hydraulic components. Specialised certification and intrinsically safe tools are typically required on-site.
Valve Leak
IndustryA valve leak occurs when a valve fails to fully seal, allowing unintended fluid or gas flow. For subcontractors, it often triggers emergency callouts, inspection holds, or scope additions. Document all findings carefully to support change order billing.
Negative Gas Prices
IndustryOccurs when oversupply forces producers to pay buyers to take gas, signalling severe market stress. For subcontractors, this often triggers rapid project suspensions, deferred work orders, and delayed payments. Expect scope reductions and early contract terminations when prices turn negative.
Field Ticket
IndustryA document created in the field that records work performed, equipment used, materials consumed, and time spent. Field tickets are the basis for invoicing and must typically be approved by the customer before payment.
Takeaway Capacity
IndustryThe available pipeline, trucking, or rail infrastructure to move produced oil, gas, or water away from a wellsite or facility. When takeaway capacity is constrained, operators may shut in wells or delay projects, directly reducing field service work volumes. Subcontractors should monitor regional takeaway conditions as they signal upcoming slowdowns or surges in activity.
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