The hard rock stratum will seriously affect the efficiency of deep-sea drilling and greatly increase cost operations due to its complexity. In ocean operations, design bit is critical. Therefore, core should be able drill in a variety formations, especially stratum, with function reducing need change formation changes improving efficiency. this paper, three different bits were designed accordin...

Kediri Regency is a potential area for mining minerals. One of the rock excavation materials found in type andesite and backfill. Backfill mineral as result weathering parent rock, which rich fragments silica elements. This research was conducted at exploration location Tarokan Village, District, Regency. The study using petrological analysis to obtain types estimates availability these mineral...

Dolomites and eruptive rocks are well-developed in the Permian Fengcheng Formation Junggar Basin China, which oil gas accumulated extensively. Until now, high-yield industrial flows have been obtained dolomitic tuff of second unit Formation, demonstrates huge exploration potential thick layer massive tuff. The lithology this area has gradually transformed from dolomite, to siltstone east west. ...