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Fluid depth – most accurate method
The most accurate method is to add the actual measured lengths from a tubing tally. This method
is time consuming and on older pumping wells a tubing tally may no longer be accessible in the records.
Fluid depth – most common method
The most common method of getting the fluid depth is to multiply the number of collars by the
average joint length. Remember that the depth to perforations is normally measured from the kelly
bushing (K.B.) or from the rig floor.
Example:
in feet
K.B.
10.00
Hanger
.75
1 pup joint
6.12
180 joints tubing
5625.72
Anchor catcher
2.68
1 joint tubing
31.31
SN (seating nipple)
1.57
1 joint
31.45
Slotted Mud Anchor
28.90
Tubing Landed at
5738.50
5738.50 - 28.90 = 5709.60 feet
Since the pump intake is at the top of the mud anchor we use all lengths from K.B. to the top of
the mud anchor to determine the average joint length.
5709.60 feet / 182 jts. = 31.37 feet/jt
The number of joints measured multiplied times the average joint length will give the fluid level
in feet from the K.B.
Fluid depth -- when no joint length is available
When no average joint length is available, then using 31.00/jt is a rule of thumb, with the
understanding that there are inaccuracies involved.
Summary of Contents for Acoustic Fluid Logger III
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