hole deviation

[′hōl ‚dē·vē‚ā·shən]

(engineering)

The change in the course or direction that a borehole follows.

References in periodicals archive ?

One (1) hole was abandoned and re-collared due to drill hole deviation.

IAMGOLD Reports Results from Its 2019 Drilling Program on the New Gosselin Gold Zone Cote Gold Project, Ontario

Here are the most common factors in hole deviation and general fixes.

How To Reduce Drill-Hole Deviation: Good Operating Practice Is Key to Mitigating the Problem

Hole deviation was monitored by multi-shot down hole camera and a representative population probed with a gyroscopic tool for QA/QC purposes.

-Royal Resources Limited - Maiden Iron Resource at Iron Peak

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.

Rock mass properties and their potential impacts on trenchless projects

The LS600 rig claims to deliver more accurate core sampling, less than 1 percent hole deviation, reduced waste, and faster penetration than conventional methods.

-Boart Longyear to launch LS600 sonic rig

The strong effect of the diameter size on the hole deviation is evident, with a confidence level of more than 99%.

Validation study of an analytical model of FDM accuracy

Step-less control of feed and percussion pressure avoids overfeeding and excessive tightening of connections that contribute to hole deviation and accessory wear.

Drilling demands

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.

Progress in rock drilling

You begin to talk with the blaster or the powder salesman and they keep offering the same answer, "geology." Questioning how geology could cause these problems, you get the typical answers, such as mud seams and structures, one might even explain how drill hole deviation could have been worsened by the "new" structure that only occurred in the middle of the pattern.