P&A	Plugging and abandoning a well. After a well's productive life, it is usually plugged and abandoned with cement and heavy mud. The wellhead is removed, and the casing cut off 3-6 feet underground, and a steel plate welded over the top.
Perforations	Holes through casing and cement into the productive formation.
Permeability	Ability of rock to transmit fluids through pore spaces.
Pooled Unit	Unit created by combining separate mineral interests under the pooling clause of lease or agreement.
Porosity	Percentage of the rock volume that can be occupied by oil, gas or water.
Producing Mineral Owner	An owner of minerals that are currently being produced and sold. Payments made to producing mineral owners are known as royalty payments.
Proration Unit	Acreage allocated to a well for the purpose of determining an allowable.
PSI (pounds per square inch)	An English system of measure of the amount of pressure on an area that is 1 inch square.
Processing Plant	A plant to remove liquefiable hydrocarbon.
Royalty	Funds received from the production of oil or gas, free of costs, except taxes.
Reserve Pit	Pit used to collect spent drilling fluids, cutting and wash water during drilling operations.
Reservoir	A porous, permeable sedimentary rock containing commercial quantities of oil and gas.
Residue Gas	Gas remaining after processing and extraction of NGL.
Salt Water Disposal Well (SWD)	A well used for the purpose of injecting produced water back into the ground.
Secondary Recovery	Enhanced recovery of oil or gas from a reservoir beyond the oil or gas that can be recovered by normal flowing and pumping operations. Secondary recovery techniques involve maintaining or enhancing reservoir pressure by injecting water, gas or other substances into the formation.
Severance	The separation of a mineral or royalty interest from other interests in that land given by grant or reservation
Severance Tax	A tax due the state on oil or gas produced or “severed” from the earth.
Severed Minerals	Minerals whose title has been severed from the surface title.
Sour Gas	Any natural gas containing more than 1-1/2 grains of hydrogen sulfide per 100 cubic feet or more than 30 grains of total sulfur per 100 cubic feet.
Spot Market	Short term, non-regulated, arms length contract sales of natural gas, crude oil, refined products, or liquid petroleum gas.
Substandard Acreage	Amount of acreage that is less than the standard amount for a proration unit for a field.
Surface casing	Outer casing cemented in the upper portion of the well bore to protect fresh water formations from contamination.
Surface estate	Rights and interests in the surface of land, created when the owner severs or separates his interests in the property.
Surface Owner	Owner of the rights and interests in a surface estate (where interests in a landed estate have been severed).
Sweet Gas	All natural gas except sour gas (gas containing hydrogen sulfide).
Tank Battery	Tanks for oil storage before delivery to a refinery.
3-D, Three Dimensional Seismic	Advanced method for collecting, processing, and interpreting seismic data in three dimensions. Three-dimensional seismic data are collected from closely spaced lines over an area and the data are processed as a volume. The advantages of three-dimensional seismic methodology include increased resolution as well as improved interpretational tools and data displays.
Transporter or transporting agency	Includes any common carrier by pipeline, railway, truck, motor vehicle, boat, or barge, and/or any person transporting oil or a product by pipeline, railway, truck, motor vehicle, boat, or barge.
Tubing	String of pipe set inside the well casing, through which oil or gas is produced.