hole deviation

hole deviation

[′hōl ‚dē·vē‚ā·shən]
(engineering)
The change in the course or direction that a borehole follows.
References in periodicals archive ?
Here are the most common factors in hole deviation and general fixes.
Tenders are invited for Supply of Multi shot digital unit for capturing Compass-inclinometer images of Bore hole deviation survey system, with mechanical accessories.
Hole deviation was monitored by multi-shot down hole camera and a representative population probed with a gyroscopic tool for QA/QC purposes.
In cases where a weak rock mass is present or where discontinuities in the rock are persistent, open and frequent, "unanticipated" drill hole deviation may result.
The LS600 rig claims to deliver more accurate core sampling, less than 1 percent hole deviation, reduced waste, and faster penetration than conventional methods.
the difference between the nominal value and average measured value of the shaft diameters for specimens (i), and hole deviation, that is the difference between the nominal value and average measured value of the internal diameters of specimens (ii).
Coprod also virtually eliminated hole deviation, and it was therefore possible to further increase hole diameter.
Furthermore, although the forces on the tool are somewhat reduced, significant mechanical force is still required, bringing back the problems of bit wear and hole deviation.
Hole deviation results in inefficient operations and in the worst case may create safety hazards.
Since the results are obtained immediately, it is possible to react to any hole deviation when positioning and directing the following holes.
During the 2013 program, 29 diamond drill holes were attempted, 25 holes were completed through the Deep Kerr target, two were lost due to significant hole deviation (K-13-27 and K-13-33) and two were terminated due to weather and are available for re-entry in the future ( K-13-25D and K-13-28C).