دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

added friction in a deviated well as wireline or coil rubs against the top of the deviated section as the tube or cable is pulled out of a well.

n: a short cylindrical device installed in the drill stem between the bottom most drill collar and a downhole motor. Its purpose is to deflect the downhole motor off vertical to drill a directional hole. See drill stem.

a short section of a tool or pipe that is formed at an angle or is modified downhole by a motor to assist in entering deviated wellbores or drilling off the path of the wellbore.

the angle of the inclination in the kickoff section when describing a deviated well.

n: See deviated hole.

a well with an inclination other than zero degrees from vertical. In practice, deviated wells are usually more than about 10o from vertical.

n: signals transmitted from an instrument located downhole to a receiving monitor on the surface-a surfacereadout instrument. Downhole telemetry may be transmitted via a special wireline or via mud pulse (much as radio signals are transmitted through the air). Frequently, downhole telemetry is employed in determining the drift angle and direction of a deviated wellbore. See measurement while drilling.

n: The process whereby signals are transmitted from a downhole sensor to a surface readout instrument. This can be done by a conductor line (as on steering tools) or by mud pulses (as in MWD tools (q.v.)).

n: the inclination of a ship or a floating offshore drilling rig to one side, caused by wind, waves, or shifting weights on board. Also called list.

the area of pay closest to the casing in a highly deviated well.

a highly deviated well.

n: a directional well that reaches an inclination of 90 degree

for a strict definition, a 90o deviated well. Actually the well covers a range of “highly” deviated wells (80o to >90o). In the strictest terms, the deviation is measured as 90o from vertical, but tilting bedding planes may make the deviation to the beddi

n: a device used to determine the direction and drift angle of a deviated wellbore. It uses a magnetic compass to measure magnetic direction, which differs from true direction by the amount of local declination.

n: the apparatus that measures drift azimuth and deviation angle.

n: a directional survey that provides a record of drift angle and direction at various depths in the hole. See directional survey.

n: A technique for determining the deviation of a wellbore. The multishot tool provides more accuracy than the single-shot tool and is usually used in highly deviated wells.