Oil and Gas Terms Beginning with "T"

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A small-volume completion component installed in the tubing or casing that provides a visual or measurable indication of whether a tool has properly set, a valve has opened or closed, or fluid has reached a certain depth, confirming completion operation success.

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A geophysical exploration technique that measures naturally occurring electrical currents induced in the earth by variations in the ionosphere and magnetosphere; telluric current surveys detect subsurface resistivity contrasts that may indicate hydrocarbon-bearing formations.

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The rate of increase in temperature with depth in the earth, typically expressed in degrees per unit depth (°F/100 ft or °C/km); the geothermal gradient is critical for predicting formation temperatures during drilling, evaluating hydrocarbon maturity, and designing downhole equipment.

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A rheological measurement of the static gel strength of a drilling fluid after the fluid has been static for ten minutes, indicating the ability of the mud to suspend drill cuttings and weighting material during periods of no circulation.

A rheological measurement of the static gel strength of a drilling fluid after the fluid has been undisturbed for ten seconds, indicating the initial rate at which the mud develops gel structure and its ability to prevent barite sag during brief periods of no circulation.

A rheological measurement of the static gel strength of a drilling fluid after the fluid has been static for ten minutes, indicating the ability of the mud to suspend drill cuttings and weighting material during periods of no circulation.

A rheological measurement of the static gel strength of a drilling fluid after the fluid has been undisturbed for ten seconds, indicating the initial rate at which the mud develops gel structure and its ability to prevent barite sag during brief periods of no circulation.

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A structural unit in clay minerals in which silicon or aluminum atoms are surrounded by four oxygen atoms in a pyramid-shaped arrangement; tetrahedral layers combine with octahedral layers to form the layered sheet structure of clay minerals important in drilling fluid interactions.

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In pulsed neutron logging, the measurement of gamma rays emitted during thermal neutron capture by formation elements, used to identify lithology, measure formation water salinity, and monitor changes in reservoir fluid saturations over the producing life of a field.

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A drilling fluid additive used to reduce viscosity and gel strength by deflocculating clay particles and dispersing solids; common thinners include lignosulfonates, chrome lignosulfonates, and polyphosphates, which adsorb onto clay surfaces and create repulsive charges.

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The operation of removing the entire drill string or completion string from the wellbore, typically to change the bit, BOP configuration, or bottom hole assembly; a trip involves pulling all pipe out of the hole (trip out) and often running a new assembly back in (trip in).

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The operation of pulling the drill string or completion string out of the wellbore to surface, performed to change the drill bit, replace bottom hole assembly components, or complete drilling operations; abbreviated as TOOH or POOH.

A specially formulated drilling fluid pill, typically a high-viscosity sweep, pumped ahead of a trip out of the hole to clean the wellbore of cuttings and condition the mud, reducing the risk of packoff or stuck pipe during the trip.

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A seismic data processing technique that corrects for the geometric spreading and absorption losses that cause seismic amplitudes to decrease with increasing travel time and offset, restoring amplitudes to values proportional to true reflectivity for AVO and quantitative interpretation.

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A perforating method in which the perforating gun assembly is conveyed to depth on the production tubing string rather than on wireline or coiled tubing, allowing perforation of long intervals, highly deviated wells, or zones with heavy fluid columns where wireline tractoring is impractical.

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Describing sediments or rocks containing a significant proportion of volcanic ash or tuff material; tuffaceous formations can exhibit complex porosity and permeability characteristics due to the mixed siliciclastic and volcanic composition, affecting drilling fluid selection and cementing programs.

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