Oil & Gas Glossary 1.0

2. difference between the annular velocity of the fluid and the rate at which a cutting is removed from the hole.

2. difference between the annular velocity of the fluid and the rate at which a cutting is removed from the hole.

1. the rate at which drilled solids tend to settle in the borehole as a well is being drilled.

A singular component of an entire slip system

A cutout section in a cone enabling positive slip movement without the aid of conventional slip return springs

A slip employing tungsten-carbide "buttons" in lieu of conventional wicker-type teeth to set tools in very hard casing.

1. a passageway through jet bits that causes the drilling fluid to be ejected from the bit at high velocity. The jet of mud clears the bottom of the hole. Nozzles come in different sizes that can be interchanged on the bit to adjust the velocity with which the mud exits the bit.

That velocity at the transitional point between laminar and turbulent types of fluid flow. This point occurs in the transitional range of Reynolds numbers of approximately 2,000 to 3,000.

1. speed.

A slip-type collar that is used to join plain-end pipe.

Used to describe packers with one slip system for supporting weight and pressure from above only.

A storm choke

2. the timed rate of linear motion.

A device in a rotary table or other tool into which tubing, drill pipe, or slips can be inserted.

A generic term used to describe certain tool movements, such as the cone-to-slip engagement on permanent packers or plugs.

A conducting ring that gives current to or receives current from the brushes in a generator or motor.

A tubing sub made of abrasion-resistant material. It is used in a tubing string where high-velocity flow through perforations may cause external erosion.

The erratic, nonlinear flow of a fluid, caused by high velocity. Characterized by random eddying flow patterns superimposed on the general flow progressing in a given direction.

A relatively small container of high explosive that is loaded into a perforating gun. On detonation, the charge releases a small, high-velocity stream of particles (a jet) that penetrates the casing, cement, and formation. See perforating gun.

The pressure lost in a pipeline or annulus due to the velocity of the liquid in the pipeline, the properties of the fluid, the condition of the pipe wall, and the alignment of the pipe. In certain mud-mixing systems, the loss of head can be substantial

A device that detects vibrations in the earth. It is used in studying the earth's interior and in prospecting for probably oil-bearing structures. Vibrations are created by discharging explosive in shallow boreholes, by striking the surface with a heavy blow, or by vibrating a heavy plate in contact with the ground. The type and velocity of the vibrations are recorded by the seismograph indicate the general characteristics of the section of earth through which the vibrations pass.

The state in fluid dynamics of a fluid in motion is determined by the type of fluid (e.g., Newtonian, plastic, pseudoplastic, dilatant); the properties of the fluid such as viscosity and density; the geometry of the system; and the velocity. Thus, under a given set of conditions and fluid properties, the fluid flow can be described as plug flow, laminar (called also Newtonian, streamline, parallel, or viscous) flow, or turbulent flow.