(011)Sensor to bit calculations

© 2001, Halliburton Energy Services, Inc.
March 7, 2001
Calculating and Using Sensor to Bit Distance

© 2001, Halliburton Energy Services, Inc.
March 7, 2001
Sensor Measure Point
Used to calculate sensor to bit distance
Surveys referenced to where measurements made, not to bit
Gamma referenced to where measurements made, not to bit

© 2001, Halliburton Energy Services, Inc.
March 7, 2001
Identify Sensor and Probe Type
Directional Only
DEP, DEP2, PCD
Gamma
PCG

© 2001, Halliburton Energy Services, Inc.
March 7, 2001
Sensor Measure Point – DEP2

© 2001, Halliburton Energy Services, Inc.
March 7, 2001
Sensor Measure Point - PCD

© 2001, Halliburton Energy Services, Inc.
March 7, 2001
Sensor Measure Point - PCG

© 2001, Halliburton Energy Services, Inc.
March 7, 2001
Bottom Ring to
Probe Bottom Distance
Measure the distance from the Bottom Ring Assembly to the bottom of the probe.
(6.3’)

© 2001, Halliburton Energy Services, Inc.
March 7, 2001
Obtain BHA Tally
Bit 8 ½” 0.75’
Motor 6 ¾” 24.35’
Stabilizer 6 ¾” 5.72’
NMDC 6 ¾” 29.87’
HOS 6 ¾” 6.21’
X-over sub 6 ¾” 2.37’
NMCD 6 ¾” 28.53’

© 2001, Halliburton Energy Services, Inc.
March 7, 2001
Obtain Bore Depth from Spacer Stack Calculations
54.25”
54.25”

© 2001, Halliburton Energy Services, Inc.
March 7, 2001
Calculations
Add lengths from bit to top of MWD mounting sub or collar
66.9’
Subtract HOS Bore Depth
62.38’
Subtract distance from bottom ring to bottom of probe
56.08’
Add sensor measure point (PCD)
56.94’