Waste disposal
The process of getting rid of unwanted, broken, worn out, contaminated or spoiled materials in an orderly, regulated fashion.

Waste oil
Any mineral-based lubrication or industrial oils which have become unfit for the use for which they were originally intended, and in particular used combustion engine oils and gearbox oils, and also mineral lubricated oils, oils for turbines and hydraulic oils.

Waste recovery
Recovery can be divided into re-use, material recycling and energy utilisation. This means that recovery, or making use of waste and other residual products, is a collective term for three possible ways of recycling, where re-use means new utilisation of a product in its original form, material recycling means utilisation of waste in such a way that the component materials are used entirely or partially, whilst energy utilisation means utilisation of the energy in the waste through incineration, pyrolysis or similar processes.

Waste storage
The placement of waste in a suitable location or facility where isolation, environmental and health protection, and human control are provided. This is done with the intention that the waste will be subsequently retrieved for treatment and conditioning and/or disposal (or clearance of hazardous waste).

Waste water treatment plant
A water effluent treatment facility containing a series of tanks, screens, filters and other mechanical, biological, and chemical processes by which pollutants are removed from water. Less frequently referred to as Waste Treatment Plant.

Waste waters
A combination of the liquid and water-carried wastes from residences, commercial buildings, industrial plants and institutions, together with any groundwater, surface water and storm water that may be present.

Water consumption
Refers to the water resources that are consumed or used, which can serve as an indicator of water quality impacts, risks to aquatic ecosystems, and degradation of drinking water resources.

Water pollution
Water pollution is defined as a change in the chemical, physical and biological health of a waterway due to human activity. Ways that humans have affected the quality of the water throughout the planet over the centuries include sewage disposal, toxic contamination through heavy metals and pesticides, overdevelopment of the water’s edge, runoff from agriculture and urbanization, air pollution, etc.

Water quality
The condition of water with respect to the amount of impurities in it.

Water regimen control
The physical control of water by such measures as conservation practices on land, channel improvements, and installation of structures for water retardation and sediment detention.

Water supply
Any quantity of available water; the processes involved in obtaining water for the user, before use, include withdrawal, water treatment, and distribution.

Land area from which water drains toward a common watercourse in a natural basin.

Watt (W)
A metric unit of power, which gives the rate at which work is done or energy is expended. Watt (Electric): The electrical unit of power. The rate of energy transfer equivalent to 1 ampere of electric current flowing under a pressure of 1 volt at unity power factor. Watt (Thermal): A unit of power in the metric system, expressed in terms of energy per second, equal to the work done at a rate of 1 joule per second.

Wave energy
Ocean waves are a derived form of solar energy, with the unequal solar heating of the earth generating wind, and wind blowing over water generating waves. There are a variety of wave energy systems under development, ranging from small-scale shoreline to large scale off-shore systems. The wave energy systems at the shoreline typically are oscillating water column devices while off-shore the devices are floating and held in place by different types of moorings.

Wave motion
A recurring disturbance advancing through space with or without the use of a physical medium and carrying energy.

WCED (World Commission on Environment and Development)
The WCED was established in 1983 in response to the United Nations General Assembly (UN GA) Resolution 38/161. The WCED, or the Brundtland Commission, popularized sustainable development in its 1987 report, Our Common Future. The WCED’s definition of sustainable development—development that meets the needs of the present without compromising the ability of future generations to meet their own needs— is now part of the environment lexicon.

WEC (World Energy Council)
See World Energy Council (WEC)

Weed killers
A chemical that will kill or inhibit the growth of weeds, a herbicide.

Well damage
Any restriction to flow from near-well reductions in flow capacity.

Well stimulation
Concerns fracturing, acidizing and other well stimulation treatments that are frequently used to rejuvenate old of poorly producing wells.

Wildcat well
An exploration well drilled to identify new accumulations of oil or gas.

Wind energy
Wind Energy comes from moving air which is converted to electric power to create electricity. Due to unequal solar heating of the earth, wind is generated. As air flows past the rotors (see) of a wind turbine, the rotor spins and drives the shaft of an electric generator. Wind turbines with small rotors are often used for battery charging while larger rotors are used to generate large amounts of electricity that can be used locally or fed into the regional grid.

A small-diameter metal line used to lower tools, such as logging tools, perforating guns, valves, and fishing tools into a well. May include electrical conductors to power and control instruments and to convey data to the surface. Also called slick line.

Wobbe index
A number which indicates interchangeability of fuel gases and is obtained by dividing the heating value of a gas by the square root of its specific gravity.

1. Lignified secondarily thickened plant tissue. The structural parts of woody perennials. 2. A small grove of trees of mixed species complete with undergrowth. The size is variable but it does not cover a large area. Wood is a renewable material used in building, ship construction, carpentry and joinery, furniture etc as well as a renewable energy resource.

Remedial work to the equipment within a well, the well pipework, or relating to attempts to increase the rate of flow.

Worldscale (WS)
International freight index for tankers. A method of calculation of payment for the transport of oil by ships, for a single or several consecutive voyages. Worldscale is a table giving the amount of USD pr ton oil for a number of standard routes. The rates listed in the table – so-called flat rates termed W100 – are revised annually.

WTI (West Texas Intermediate)
West Texas Intermediate is a benchmark crude against which other crudes are priced. A light (40 degrees API) sweet blend of crude oils produced in fields in Western Texas. The benchmark for US crude oil. (source: Reuters Financial Glossary)

WWF (World Wide Fund For Nature )
World Wide Fund for Nature (formerly World Wildlife Fund). It aims to conserve nature and ecological processes by preserving biodiversity, ensuring sustainable use of natural resources and promoting the reduction of pollution and wasteful use of resources and energy. (source: United Nations – Statistics Division).



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