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In general, possible reserves may include 1 reserves which, based on geological interpretations, could possibly exist beyond areas classified as probable, 2 reserves in formations that appear to be petroleum bearing based on log and core analysis but may not be productive at commercial rates, 3 incremental reserves attributed to infill drilling that are subject to technical uncertainty, 4 reserves attributed to improved recovery methods when a a project or pilot is planned but not in operation and b rock, fluid, and reservoir characteristics are such that a reasonable doubt exists that the project will be commercial, and 5 reserves in an area of the formation that appears to be separated from the proved area by faulting and geological interpretation indicates the subject area is structurally lower than the proved area.
Developed: Developed reserves are expected to be recovered from existing wells including reserves behind pipe.
Improved recovery reserves are considered developed only after the necessary equipment has been installed, or when the costs to do so are relatively minor. Developed reserves may be subcategorized as producing or non-producing.
Producing: Reserves subcategorized as producing are expected to be recovered from completion intervals which are open and producing at the time of the estimate. Improved recovery reserves are considered producing only after the improved recovery project is in operation. Non-producing: Reserves subcategorized as non-producing include shut-in and behind-pipe reserves.
Shut-in reserves are expected to be recovered from 1 completion intervals which are open at the time of the estimate but which have not started producing, 2 wells which were shut-in for market conditions or pipeline connections, or 3 wells not capable of production for mechanical reasons.
Behind-pipe reserves are expected to be recovered from zones in existing wells, which will require additional completion work or future recompletion prior to the start of production. Undeveloped Reserves: Undeveloped reserves are expected to be recovered: 1 from new wells on undrilled acreage, 2 from deepening existing wells to a different reservoir, or 3 where a relatively large expenditure is required to a recomplete an existing well or b install production or transportation facilities for primary or improved recovery projects.
Definitions Reserves are those quantities of petroleum which are anticipated to be commercially recovered from known accumulations from a given date forward. Proved Reserves Proved reserves are those quantities of petroleum which, by analysis of geological and engineering data, can be estimated with reasonable certainty to be commercially recoverable, from a given date forward, from known reservoirs and under current economic conditions, operating methods, and government regulations.
U.S. Energy Information Administration - EIA - Independent Statistics and Analysis
Probable Reserves Probable reserves are those unproved reserves which analysis of geological and engineering data suggests are more likely than not to be recoverable. Reserve Status Categories Reserve status categories define the development and producing status of wells and reservoirs. Crude oil varies radically in its properties, such as specific gravity and viscosity.
Derrick — A tapering tower, usually of open steel framework, used in the drilling of oil and gas wells as support for the equipment lowered into the well. Distillate Fuel Oils — Fuel oils which are products of distillation. They include fuels used for diesel fuel and space heating. Directional Drilling — The drilling of a well that departs materially from the vertical direction. Downstream — Those activities in the oil and gas industry which take place away from the source of the supply.
Downstream operations commonly include refining and marketing endeavors. Drilling Fluids — Special chemical fluids, usually called mud, introduced into the hole to lubricate the action of a rotary bit, to remove the cuttings and to prevent blowouts. Dry Gas — Natural gas which does not contain dissolved liquid hydrocarbons. Enhanced Recovery — The increased recovery from an oil pool achieved by artificial means or by the application of outside energy sources to the pool. Equivalent Barrels — Quantities of natural gas and natural gas liquids translated into barrels of oil based on equal energy content.
The energy content of six thousand cubic feet of gas 6 MCF is the rough equivalent of one barrel of oil. Exploration — The search for oil and gas. Exploration operations include aerial surveys, geophysical surveys, geological studies, core testing and the drilling of test wildcat wells. Fault Trap — A structural trap in the earth, favorable for the retention of petroleum, formed by the cracking and breaking of a rock plane. Gusher — An oil well that comes in with such great pressure that oil flows out of the well head into the air.
Such wells used to be commonplace, but with improved drilling methods, notably the use of drilling mud, gushers are a rarity today. Horizontal Drilling — A method of drilling where the drill bit is turned in a horizontal direction in an effort to produce hydrocarbons from a number of areas located at the same approximate depth. Independent — A company involved only in the exploration and production of oil and gas and possibly in the transportation. An independent will not be involved in the refining of oil. Injection well — A well employed for the introduction into an underground stratum of water or gas under pressure.
Injection wells are employed for the disposal of produced water from oil and gas wells. Integrated Company — A company involved in virtually all aspects of the oil and gas industry including exploration, production, transportation, refining and marketing. These companies are also referred to as major oil companies. Lease — The instrument by which a leaseholder or working interest is created in minerals.
Dictionary of Oil and Gas Production: Clifford Jones: - Whittles Publishing
LNG — Liquefied natural gas. Natural gas becomes a liquid at a temperature of minus degrees F and may be stored and transported in the liquid state. The standard unit for measuring the volume of natural gas. Natural Gas — Hydrocarbons, which at atmospheric conditions of temperatures and pressure, are in a gaseous phase.
Natural Gas Liquids — Hydrocarbons found in natural gas which may be extracted or isolated as liquefied petroleum gas and natural gasoline. Generally the area outside the territorial boundaries of the coastal state over which the federal government exercises control. Oil Field — An area which is underlain by one or more reservoirs containing oil. Overboard Water — Another name for produced water or brine produced from oil and gas wells. Platform — Structure used in offshore drilling on which the drilling rig, crew quarters and other related items are located.
- Mandated Landscape: British Imperial Rule in Palestine 1929-1948;
- Oil production - definition of oil production by The Free Dictionary!
- Oil and Gas Authority: Glossary of Terms.
- 1st Edition.
Plugging of Well — The sealing off of the fluids in the stratum penetrated by a well so that the fluid from one stratum will not escape into another or to the surface. Probable Reserves — An estimate of reserves taking into consideration known geology, previous experience with similar types of reservoirs and seismic data, if available. The Joint Committee on Reserves Evaluator Training JCORET exists to meet the need for high-quality, industry-recognized training for individuals responsible for petroleum reserves and resources evaluation.
Learn More. Download a. OGRC mapping pdf Estimating and Auditing Standards for Reserves To assist those responsible for estimating reserves, or auditing those estimates, a standard approach has been outlined, along with minimum qualifications for those involved in reserves auditing.