Decommissioning of onshore facilities usually includes the complete removal of permanent facilities and well abandonment, including associated equipment, material, and waste disposal or recycling. Specific additional requirements to be considered for oil and gas facilities include well abandonment and pipeline decommissioning options.
Typical non-hazardous and hazardous wastes routinely generated at offshore facilities include general office and packaging waste, waste oils, oil contaminated rags, hydraulic fluids, used batteries, empty paint cans, waste chemicals and used chemical containers, used filters, fluorescent tubes, scrap metals, and medical waste, etc.
Produced water is water produced in association with crude oil, is by far the largest waste stream in most oil fields, accounting for up to 95% of total wastes. It is composed of a complex mixture of inorganic (dissolved salts, trace metals, suspended particles) and organic (dispersed and dissolved hydrocarbons, organic acids) compounds, and in many cases, residual chemical additives (e.g. scale and corrosion inhibitors) that are added into the hydrocarbon production process.
The Algarve Blocks 13 (Lagosta) and 14 (Lagostim) in the Algarve Basin is a concession situated 8.5 km from Faro Island and 15 km from Faro town, and which according to António Costa Silva, CEO of Partex Oil and Gás during an interview with the Expresso Newspaper on the 25 de Setembro 2010, has gas reserves that are 20 times bigger than the reserves found in the Poseidon North and South gas fields in neigbouring Spain.