دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

in a horizontal plane, it is the angle (measured clockwise) of well path departure usually from true or magnetic north. It may also be expressed as the compass direction of the path of the well bore as measured by a borehole survey. (Note: check the speci

n: see deviation.

n: One of the coordinates used to plot the path of the well on the horizontal plane (alone the x axis).

the distance from the kelly bushing horizontally to the end of the well.

n: The curve which can be adjusted by standard curve.

graphs that show influence of a variable on the basic measurement;e.g., temperature, hole diameter, mud resistivity, bed thickness, adjacent bed resistivity, etc.

n: departure of the wellbore from the vertical, measured by the horizontal distance from the rotary table to the target. The amount of deviation is a function of the drift angle and hole depth. The term is sometimes used to indicate the angle from which a bit has deviated from the vertical during drilling. See drift angle.

n: The angle at which a wellbore diverges from vertical. Wells can deviate from vertical because of the dips in the beds being drilled through. Wells can also be deliberately deviated by the use of a whipstock or other steering mechanism. Wells are often dev

n: an operation made to determine the angle from which a bit has deviated from the vertical during drilling. There are two basic deviation-survey, or driftsurvey, instruments: one reveals the drift angle;the other indicates both the angle and the direction of deviation.

n: See bore-hole surveying.

a record of the deviation angle and the departure usually on a depth unit basis.

n: see horizontal displacement.

n: deviation of the borehole at least 80. from vertical so that the borehole penetrates a productive formation in a manner parallel to the formation. A single horizontal hole can effectively drain a reservoir and eliminate the need for several vertical boreholes.

n: drilling when the departure of the wellbore from vertical exceeds about 80 degrees. Beause a horizontal well typically penetrates a greater length of the reservoir, it can offer significant improvement over a vertical well.

a well drilled in a manner to reach an angle of 90 degrees relative to a level plane at its departure point at the surface. In practice, the horizontal section of most horizontal wells vary several degrees.

an indefinite term, usually meaning one or more departures from a mother bore. May be used in some areas to mean a high angle well bore.