Methods of operation of apparatus measuring formation resistivity from within a cased well having one measurement and two compensation steps
- (Bothell, WA)
Methods of operation of an apparatus having at least two pairs of voltage measurement electrodes vertically disposed in a cased well to measure the resistivity of adjacent geological formations from inside the cased well. During stationary measurements with the apparatus at a fixed vertical depth within the cased well, the invention herein discloses methods of operation which include a measurement step and subsequent first and second compensation steps respectively resulting in improved accuracy of measurement. First and second order errors of measurement are identified, and the measurement step and two compensation steps provide methods to substantially eliminate their influence on the results. A multiple frequency apparatus adapted to movement within the well is described which simultaneously provide the measurement and two compensation steps.
- Research Organization:
- ParaMagnetic Logging, Inc. (Bothell, WA)
- DOE Contract Number:
- FG06-84ER13294
- Assignee:
- Para Magnetic Logging, Inc. (Woodinville, WA)
- Patent Number(s):
- US 5223794
- OSTI ID:
- 868834
- Country of Publication:
- United States
- Language:
- English
Similar Records
Determining resistivity of a formation adjacent to a borehole having casing with an apparatus having all current conducting electrodes within the cased well
Electronic measurement apparatus movable in a cased borehole and compensating for casing resistance differences
Related Subjects
operation
apparatus
measuring
formation
resistivity
cased
measurement
compensation
steps
pairs
voltage
electrodes
vertically
disposed
measure
adjacent
geological
formations
inside
stationary
measurements
fixed
vertical
depth
discloses
step
subsequent
respectively
resulting
improved
accuracy
errors
identified
provide
substantially
eliminate
influence
results
multiple
frequency
adapted
movement
described
simultaneously
compensation steps
apparatus adapted
vertically disposed
voltage measurement
measurement electrodes
geological formations
adjacent geological
formation resistivity
geological formation
multiple frequency
simultaneously provide
substantially eliminate
improved accuracy
discloses methods
fixed vertical
electrodes vertically
/324/