EWC Code
Oil-containing drilling muds and wastes
EUR-Lex Commission Decision 2000/532/EC — Official Journal L 226, 06/09/2000Annual Volume (EU)
~5 Mt/year EU onshore and offshore drilling waste
Valorisation Range
Drill cuttings treatment €40–120/t; recovered base fluid €200–800/t
Primary Route
Thermal desorption / cuttings cleaning
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Get contacts for EWC 01 05 05*EWC 01 05 05* is a specific sub-code under EWC 01 05 — Drilling muds and other drilling wastes. The classification guidance below applies to this waste stream.
EWC 01 05 covers drilling muds (water-based, oil-based and synthetic-based), drill cuttings and other wastes arising from borehole drilling in exploration, production and geothermal operations. The hazardous classification depends critically on the base fluid used: water-based muds with low additive content are generally non-hazardous (01 05 04), while oil-based and synthetic-based muds generate hazardous cuttings (01 05 05*, 01 05 06*) requiring specialist treatment.
Drill cuttings from oil-based mud (OBM) drilling are the most commercially significant stream — offshore North Sea operations generate several hundred thousand tonnes per year. Total oil on cuttings (TOC) determines treatment requirements: offshore discharge requires TOC <1% by weight per OSPAR guidelines. Thermal desorption and cuttings re-injection are the primary treatment technologies.
Geothermal drilling waste includes high-temperature brines, silica scale and naturally occurring radioactive material (NORM) in some formations. Mineral exploration cuttings are typically inert and managed as non-hazardous. EU offshore oil and gas operations are governed by Directive 2013/30/EU, with environmental provisions delegating to OSPAR for North Sea and HELCOM for Baltic operations.
Typical Generators
Established valorisation pathways for EWC 01 05 05*, ranked by economic value and market depth.
Low-temperature thermal desorption recovers base oil from OBM cuttings, reducing TOC to <0.1% and allowing landfarm or permitted disposal. Recovered oil recycled into mud system. Standard technology for North Sea offshore operations.
Treated cuttings slurry injected into sub-surface formation via dedicated disposal well. Eliminates surface disposal requirement. Regulated under national offshore environmental permits; OSPAR HAZCHEM assessment required.
Water-based mud cuttings (non-hazardous) may be landfarmed (bioremediation of hydrocarbon contamination) or disposed at licensed hazardous or non-hazardous landfill depending on characterisation results.
These are the established routes for EWC 01 05 05*. Which one your stream qualifies for depends on its composition, volume and region.
Get the ranked options for your streamPrimary & secondary off-takers
Primary generator; drilling waste management is an integral operational cost
Gas well drilling generates similar waste streams to oil operations
Drilling waste management contractors operate treatment facilities and CRI wells
Geothermal plant operators manage borehole brines and silica scale
Sectors that valorise EWC 01 05 05* as an input material or secondary raw material.
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