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AssigneeSchlumberger Technology Corporation
InventorsJohn E. Edwards, Luca Ortenzi
Estimating the term…
A method is disclosed for producing a single logging-while-drilling (LWD) merged caliper from several indirect LWD borehole size measurements. The merging accounts for the varying validity of each input borehole size measurement as a function of the environment, the formation, and the borehole size itself. In one embodiment, the method includes obtaining a plurality of borehole size measurements from a plurality of LWD sensors and weighting each measurement with varying measurement confidence factors. One embodiment of the method includes determining a set of mathematical equations representative of the responses of the multiple sensors and solving the equation set to determine the borehole size. A computer encoded with instructions for weighting borehole size inputs and iteratively processing the weighted inputs to determine the merged caliper is also disclosed.
A method for determining the size of a borehole penetrating an earth formation, comprising:
A method for determining the size of a borehole penetrating an earth formation, comprising:
A computer encoded with instructions for performing operations on a plurality of borehole size measurement inputs acquired with a plurality of sensors that were disposed within a borehole traversing a subsurface formation, the sensors being adapted to make said measurements using different measurement principals, said instructions comprising:
Dependencies are inferred from the claim text.