E

Ejector: A device for conveying a liquid by entraining it in a high-velocity stream of air or water. EL: Elevation. EL&P: Exploration, land, and production. Elastic: Nonpermanent structural deformation during which the amount of deformation (strain) is proportional to the applied stress (load). Elastic Deformation: Deformation of a body in the elastic range, that is, recovery to the initial shape is possible when the stress or load is removed. Elasticity: The tendency of a body to return to its original shape and size once the stress is removed. Elastic Limit: The upper range of elasticity, just before the body is permanently deformed. Elastomer: (1) A polymer that, when deformed (stretched, twisted, spindled, mutilated, etc.), springs back into its original shape. The elastomer par excellence is lightly cross-linked natural rubber. (2) A rubber or plastic material used as a seal. May occur naturally or be synthesized. Elbow: An “L” shaped tting in surface piping. Electricity (Purchased): Electricity purchased for renery operations that is not produced within the renery complex. Electric Line: A wire line with a conductor in the middle and woven electrical braid over the conductor. Electric Log: (1) An electrical survey made on uncased holes. A special tool is lowered into the hole that ejects an electrical current into the rock and records its resistance to the current. The data from the survey are used by the geologists to determine the nature of the rock and its contents. (2) Typically a resistivity log. (3) Records weak electrical currents that ¤ow in the rock next to the wellbore and shows the thickness and boundaries of the rock layers. These logs help determine the amount of salt water present and the permeability. Electric Logging: A method of rock and ¤uid identication or evaluation that began in 1927. The rst log was run by Conrad Schlumberger. Electric Logging Tool: A tool attached to a cable that is lowered into a well to survey the borehole before it is cased. An electrical impulse is emitted that is re¤ected from the rock strata. The degree of resistance to the current allows geologists to determine the nature of the rock penetrated by the drill and some indication of its permeability, porosity, and content (gas, oil, or water). Electric Power Sector: An energy-consuming sector that consists of electricity only and combined heat and power (CHP) plants whose primary business is to sell electricity, or electricity and heat, to the public. Electric Rig: A drilling rig where the power source is electricity provided by a generator. Electric Submersible Pump: (1) A downhole articial lift unit powered by electricity. (2) An electric powered rotating pump capable of lifting very large ¤ow rates (>20,000 bpd).