Oil and Gas Terms Beginning with “T” — Page 7

What Is a Tube Wave? A tube wave (also called a Stoneley wave) is a low-frequency guided acoustic wave that propagates along the borehole-fluid column as a coupled fluid pressure and formation shear deformation wave,… Read more →

A tubing broach is a downhole tool used to repair damaged, collapsed, or obstructed production tubing in a wellbore without pulling the tubing string, by means of a cutting or reshaping profile on the tool's outer… Read more →

Tubing displacement is the volume of fluid required to fill, or that is displaced from, a string of production tubing from surface to a specified depth — calculated from the tubing's internal diameter and length and… Read more →

A tubing end locator (TEL) is a wireline tool run inside a production tubing string to precisely locate the bottom end (tubing shoe) of the production tubing, providing a depth reference that is essential for planning… Read more →

Tubing grade is the classification system that assigns a specific steel alloy, strength level, and metallurgical condition to the production tubing run inside a well, and it is governed almost universally by API… Read more →

What Is a Tubing Hanger? A tubing hanger suspends the entire production tubing string from the tubing head spool inside the wellhead , bearing the full mechanical load of the tubing while simultaneously providing a… Read more →

A tubing head is the wellhead spool that sits above the casing head, supports the tubing hanger, and provides the top connection onto which the Christmas tree is bolted. It is the component that transitions a well from… Read more →

A tubing job is the operation of pulling and replacing the production tubing string in an oil or gas well, almost always carried out as part of a major workover after the well has been killed and a service rig moved… Read more →

A tubing joint is a single length of production tubing pipe, typically manufactured to a nominal 30-foot (9.1 meter) length in API Range 2 specification (with Range 1 joints at approximately 20 feet and Range 3 at… Read more →

A tubing performance curve (TPC), also called a vertical lift performance (VLP) curve or outflow performance curve, is a graphical representation of the flowing bottomhole pressure required to lift a specific flow rate… Read more →

Pressure on the tubing in a well, as measured at the wellhead. Read more →

A tubing puncher is a wireline or coiled tubing-deployed downhole tool that perforates the wall of production tubing by mechanically punching, cutting, or explosively shooting holes through the tubing body at a… Read more →

(noun) A seal unit consisting of elastomeric or metal-to-metal packing elements that is landed in a packer bore or polished bore receptacle to create a pressure-tight seal between the tubing string and the packer,… Read more →

A tubing testing tool is a downhole mechanical device used to plug the bottom of a production tubing string, isolating the tubing internal volume from the formation below, so that the assembled tubing string can be… Read more →

A tubing thread is the threaded connection used to mechanically join individual production tubing joints into a continuous tubing string that is run into the wellbore to convey production fluids from the reservoir to… Read more →

What Is Tubing-Conveyed Perforating? Tubing-conveyed perforating (TCP) is a completion method in which a perforating gun assembly is run into the wellbore on the production tubing string rather than on wireline. The… Read more →

A tubing-end locator (TEL) is a downhole tool run on slickline, coiled tubing, or electric wireline that detects the bottom end of the production tubing string suspended in the wellbore, providing a positive depth… Read more →

A tubing-retrievable safety valve (TRSV), also called a tubing-retrievable subsurface safety valve (TRSCSSV), is a subsurface safety valve that is run as an integral component of the production tubing string rather than… Read more →

A tubingless completion is a well-completion design in which reservoir fluids are produced directly through a small-diameter production casing string rather than through a separate production tubing run inside a larger… Read more →

A tubular jar is a downhole jarring tool incorporated into the drill string as a section of standard tubular that delivers high-impact mechanical blows (jarring loads) to free stuck pipe by converting the elastic energy… Read more →

Tubulars is the generic oilfield term for any tubular steel goods run into or installed in a well, spanning the entire string inventory of a drilling and completion program: drill pipe, drill collars, heavy-weight drill… Read more →

(noun) A type of sedimentary rock formed by the consolidation and lithification of volcanic ash and pyroclastic material ejected during explosive volcanic eruptions. Tuff beds serve as important stratigraphic markers… Read more →

What Is the Tuning Effect? The tuning effect is the constructive seismic interference that occurs when a thin bed is thinner than one-quarter of the dominant seismic wavelength, causing the reflected wavelets from the… Read more →

What Is a Turbidite? A turbidite is a sedimentary deposit formed by the rapid deposition of sediment-laden density currents (turbidity currents) that flow down continental slopes into deep-water basins. When slope… Read more →

A turbidity current is a gravity-driven underwater flow of sediment-laden water that moves along the seafloor or lake floor because the sediment suspension makes it denser than the surrounding clear water, capable of… Read more →

Turbulent flow in petroleum engineering is a chaotic, high-velocity fluid flow regime characterized by random three-dimensional fluctuations of velocity, pressure, and density superimposed on the mean flow direction, in… Read more →

What Is a Turnkey Drilling Contract? A turnkey drilling contract is a well-delivery arrangement in which the drilling contractor assumes all responsibility for completing a defined scope of well work, typically from… Read more →

To part or break the drillstring downhole due to either fatigue or excessive torque. Read more →

Parting or breaking of the drillstring downhole due to fatigue or excessive torque. Read more →

Two-dimensional seismic data is a set of individually acquired seismic lines, each recorded along a single surface traverse, that images a vertical slice of the subsurface beneath that line. It is the older and simpler… Read more →