bur_dl_tr_dls

7/26/2019 BUR_DL_TR_DLS

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United Kingdom Training Center - UTC

Build Up Rate, Turn Rate,

Dogleg & Dogleg Severity


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Objectives

Upon Completion of this module you will be able to:

Describe the properties of:

Build Up Rate

Turn Rate

Dogleg

Dogleg Severity


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Build Up Rate

The Build Up Rate or BUR is the rate of change in inclination.

The calculation is:

BUR = Change in inclination / Course Length

BUR = I / CL

It is measures in degrees per unit length. Commonly

degrees per 100ft

degrees per 30m


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Build Up Rate

Example:

Survey 1 = 22 Inc., Survey 2 = 29 Inc., Course length 63

BUR = (I2 - 11)/CL x 100 = (29 - 22) / 63 x 100 = 11.1 / 100

BUR can have values that are positive for build and

negative for drop.

When there is no change of Azimuth BUR has the same value

as DLS.


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Turn Rate

The Turn Rate is the rate of change of direction (Azimuth).

The calculation is:

TR = Change in direction / Course Length

TR = A / CL


degrees per 100ft

degrees per 30m


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Turn Rate

Example:

Survey 1 = 324 Az, Survey 2 = 333 Az, Course length 60

TR = (A2 - A1)/CL x 100 = (333 - 324) / 60 x 100 = 15 / 100

TR can have values that are positive for clockwise and

negative for anti-clockwise turn

When the well is horizontal TR has the same value as DLS.


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Turn Rate

The Turn Rate is the rate of change of direction (Azimuth).

The calculation is:

TR = Change in direction / Course Length

TR = A / CL


degrees per 100ft

degrees per 30m


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Dogleg

Dogleg is the measurement of deviation of the wellbore

It is a uniform measurement regardless of inclination or direction

DL has positive values only

DL = cos-1[sin I1 sin I2 cos(A2 - A1) + cos I1 cos I2 ]

You are not required to remember this equation


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