دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the standard unit of gamma ray measurement. Standardisation of this unit results from the normalisation of the detector-measurement systems of all primary service companies in the API test pits at the University of Houston. The API gamma ray unit is defined as 1/200 of the difference in log deflection between two zones of different gamma ray intensity. The test pit is constructed so that the average midcontinent shale will record about 100 API gamma ray units.

n: 1. in directional drilling, the direction of the wellbore or of the face of a deflection tool in degrees (0-359") clockwise from true north. 2. an arc of the horizon measured between a fixed point (such as true north) and the vertical circle passing through the centre of an object.

n: Reflecting the direction of wellbore deflection.

n: A factor reflecting wellbore deflection. It is defined as the included angle between the north and the projection of tan of survey point in the level.

n: The logging trace formed by collar locator device measuring the position of casing collar.

CCL, a downhole log recording, given by magnetic deflection, of the location of couplings or other equipment.

n: Press the cylindrical core sample put between the teeterboards of compression testing machine with axial force till breakdown. Records the alternation value of stress and deflection and draw the curve and requires compressive resistance of the rock.

n: See deflection bit.

n: a change in the angle of a wellbore. In directional drilling, it is measured in degrees from the vertical.

the total change in angle of a wellbore in a given distance.

the amount of flex exhibited by the drill string.

n: Refers to the drill bit deflecting former wellbore axis due to personal composition.