blind drilling

blind drilling

[′blīnd ′dril·iŋ]
(engineering)
Drilling in which the drilling fluid is not returned to the surface.
References in periodicals archive ?
The project area is surrounded by areas of past intense exploration interest and scattered drilling by several companies, but the Fletcher Junction Target Area has not been explored to date because the area is covered by 50' to 100' of post-mineral basalt cover, which effectively precluded the application of conventional exploration techniques short of very expensive blind drilling.