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

A type of drilling-fluid solid having a lower density than the barite or hematite that is used to weight up a drilling fluid, including drill solids plus the added bentoniteclay. The mud engineer calculates the… Read more →

A mud that has fewer solids than conventional clay-based muds of the same density and similar use. Low-solids mud design and maintenance is accomplished primarily by substituting one or more polymers for the ordinary… Read more →

Native clays that are generally unsuitable for use in a clay-based drilling mud. Low-yield clays are considered to be drill solids, although they may give high values for bentonite-equivalent in a mud according to the… Read more →

An oil mud designed and maintained with a minimum of colloid-sized solids, typically by omitting fatty-acid soap and lime, and minimizing organophilic clays and fluid-loss additives. Low-colloid oil mud, also called a… Read more →

A type of drilling-fluid solid having a lower density than the barite or hematite that is used to weight up a drilling fluid, including drill solids plus the added bentonite clay. The mud engineer calculates the… Read more →

A test to measure static filtration behavior of water mud at ambient (room) temperature and 100-psi differential pressure, usually performed according to specifications set by API, using a static filter press. The… Read more →

An enhanced oil recovery method that uses water with a low concentration of dissolved salts as a flooding medium. The sources of low-salinity water are typically rivers, lakes or aquifers associated with meteoric water. Read more →

A mud that has fewer solids than conventional clay-based muds of the same density and similar use. Low-solids mud design and maintenance is accomplished primarily by substituting one or more polymers for the ordinary… Read more →

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

Antonym: high-specific-gravity solids Read more →

Native clays that are generally unsuitable for use in a clay-based drilling mud. Low-yield clays are considered to be drill solids, although they may give high values for bentonite-equivalent in a mud according to the… Read more →

A systems tract overlying a sequence boundary and overlain by a transgressive surface. Characterized by a progradational to aggradationalparasequence set, this systems tract commonly includes a basin-floor fan, a slope… Read more →

A mud additive for lowering torque (rotary friction) and drag (axial friction) in the wellbore and to lubricate bit bearings if not sealed. Lubricants may be solids, such as plastic beads, glass beads, nut hulls and… Read more →

A term initially applied to the assembly of pressure-control equipment used on slickline operations to house the tool string in preparation for running into the well or for retrieval of the tool string on completion of… Read more →

A measure of the degree of lubrication. Read more →

A descriptive term for the strong affinity that a solid material (usually a colloid) has for the liquid in which the solid is dispersed. For example, clay is a lyophilic colloid in water. Read more →

A descriptive term for the lack of affinity (or repulsion) that a solid material has for the liquid in which the solid is dispersed. For example clay is lyophobic to oil. Read more →