Oil and Gas Terms Beginning with “L” — Page 5

A low-colloid oil mud (LCOM) is a specialized oil-based drilling fluid formulation characterized by a very low concentration of colloidal-size solids (typically less than 5-7% by volume of total solids in the colloidal… Read more →

Low-gravity solids (LGS) are a category of drilling fluid solids that have lower density than the barite or hematite weighting materials used to weight up drilling fluid systems — the LGS category includes drill solids… Read more →

A low-solids mud is a water-based drilling fluid engineered to minimize the total concentration of suspended and colloidal solids, particularly drilled solids and weighting materials such as barite, achieving faster… Read more →

What Is Low-Yield Clay? Low-yield clay (also called low-yield bentonite or sub-bentonite clay) is a type of smectitic clay mineral, typically calcium bentonite or a mixed-layer clay, that has relatively poor swelling… Read more →

A low-colloid oil mud (LCOM) is a specialized oil-based drilling fluid formulation characterized by a very low concentration of colloidal-size solids (typically less than 5-7% by volume of total solids in the colloidal… Read more →

Low-gravity solids (LGS) are a category of drilling fluid solids that have lower density than the barite or hematite weighting materials used to weight up drilling fluid systems — the LGS category includes drill solids… Read more →

The low-pressure, low-temperature (LP/LT) filtration test, also called the API filtration test or standard filtration test, is a standard wellsite and laboratory procedure for measuring the fluid loss rate of a drilling… Read more →

What Is Low-Salinity Waterflooding? Low-salinity waterflooding (also called LoSal EOR, low-sal flooding, or smart water injection) is an enhanced oil recovery technique in which injection water is diluted to a low ionic… Read more →

A non-dispersed low-solids (NDLS) drilling fluid is a water-based system that uses high-molecular-weight polymers, principally xanthan gum (XC), polyanionic cellulose (PAC), and partially hydrolyzed polyacrylamide… Read more →

A low-solids mud in which there is no claydeflocculant chemical. Read more →

Antonym: high-specific-gravity solids Read more →

Low-yield clays are naturally occurring clay minerals found in formation rock that contribute little to the viscosity or gel strength of a water-based drilling mud when they enter the mud system as drill solids. Unlike… Read more →

What Is a Lowstand Systems Tract? Lowstand systems tract (LST) (also called the lowstand wedge or basin floor systems tract) is the deepest and oldest depositional unit within a third-order stratigraphic sequence,… Read more →

A lubricant in petroleum drilling and production engineering is a substance added to drilling fluid or applied to downhole tools and tubulars to reduce friction between moving surfaces — specifically the friction… Read more →

What Is a Lubricator? Lubricator (also called a lubricator string or wireline lubricator) is a pressure-containing tubular assembly attached to the top of a wellhead, Christmas tree, or blowout preventer stack that… Read more →

What Is Lubricity? Lubricity (also referred to as the coefficient of friction or CoF of a drilling fluid) is the property of a drilling mud that quantifies its ability to reduce friction between moving metal surfaces in… Read more →

Lyophilic is a descriptive term for the strong affinity that a finely divided solid, usually a colloid, has for the liquid in which it is dispersed. The word combines the Greek roots "lyo," meaning to loosen or… Read more →

Lyophobic is a descriptive term for the lack of affinity, or active repulsion, that a dispersed solid has for the liquid in which it is suspended. The word combines the Greek roots for solvent and fear, so a lyophobic… Read more →