Energy surplus (petroleum)

The gap between the amount of energy produced from petroleum and the amount of energy required to extract it, produce it and refine it. The current status could alter if we pass the oil peak since at such a stage the cost of producing every barrel of oil will increase drastically

Engineering, Procurement and Construction; EPC Contractor

The contractor of the project is a one point of contact responsible for the engineering, procurement and construction of the project (e.g. power station, transmission system). The terms and conditions of the contract are agreed a priori and the contractor takes upon himself all the risks that are agreed upon within the contract, rather than …

Enhanced geothermal system; Engineered geothermal system

The EGS concept is to extract heat by creating a subsurface fracture system in rocks into which water can be added through injection wells. Creating an enhanced requires improving the natural permeability of rock. Rocks are permeable due to minute fractures and pore spaces between mineral grains. Injected water is heated by contact with the …

Enhanced oil recovery, enhanced gas recovery, enhanced recovery

Applying enhanced oil recovery techniques to mature oil fields, such as through waterflooding, to recover additional reserves or prolong production after primary recovery methods have run their course. By increasing production efficiency, EOR methods can prolong the economic life of older fields by as much as 30 years. Three major categories of EOR have been …

Environment Defense Fund

The fund invented the cap-and-trade system for cutting carbon emissions. The mechanism involves putting a cap on overall emissions and allows companies to buy and sell emissions reductions, so that the cheapest cuts get made first. The EDF suggested this in the 1990s as a way of cutting sulfur-dioxide emissions from power stations.

Estimated ultimate recovery

Estimated Ultimate Recovery is defined as those quantities of petroleum which are estimated, on a given date, to be potentially recoverable from an accumulation, plus those quantities already produced therefrom. Estimated Ultimate Recovery is not a resource category as such, but a term which may be applied to an individual accumulation of any status/maturity (discovered …