a measure of the acidity or alkalinity of a solution expressed as pH. See pH.

Related Terms

• PH

abbreviation: an indicator of the acidity or alkalinity of a substance of solution, represented on a scale of 0-14, 0-6.9 being acidic, 7 being neither acidic or basic (i.e., neutral), and 7.1-14 being basic. These values are based on hydrogen ion content and activity....

• Rate Of Penetration (ROP)

a measure of the speed at which the bit drills into formations, usually expressed in feet (meters) per hour or minutes per foot (meter)....

• Gas-oil Ratio

a measure of the volume of gas produced with oil, expressed in cubic feet per barrel of cubic meters per tonne....

• Mud Weight

a measure of the density of a drilling fluid expressed as pounds per gallon, pounds per cubic foot, or kilograms per cubic meter. Mud weight is directly related to the amount of pressure the column of drilling mud exerts at the bottom of the hole....

• Micellar-polymer Flooding

a method of improved oil recovery in which chemicals dissolved in water are pumped into a reservoir through injection wells to mobilize off left behind after primary or secondary recovery and to move it toward production wells. The chemical solution includes surfactants or surfactant-forming chemicals that reduce the interfacial and capillary forces between oil and...