Experience of diamond drilling with compressed air blowout

Abstract

“The area of the Deputatskoye field, where drilling was carried out, is composed of lithologically monotonous sediment strata dislocated in large gentle folds of sublatitudinal and northeastern strike. In terms of physical and mechanical properties that determine the choice of diamond tools, the rocks composing the deposit can be divided into three main groups: 1) heavily crushed, often crushed medium- and fine-grained sandstones and sandy-clay shales cemented with calcareous material and ice, VІІІІ-ІХ categories of drillability; 2) sandy-clay shales of VІІІІ category of drillability; 3) dense occluded, in some places keratinized fine-grained low-abrasive sandstones of X-XІ categories of drillability.