When developing drilling fluid formulations, first of all, the geological situation should be assessed, the mineral composition should be determined and the properties of the rocks to be drilled should be comprehensively studied.
To study the mineral composition of the planes, along which the core of argillites is destroyed in the process of drilling, samples of different degrees of stability were selected from the section of the Exploration Formation of well 1687 of the Talnakhskoye field.
The practice of exploratory drilling within the field indicates that the overwhelming number of complications and accidents during well sinking is associated with zones of argillized ignimbrites, genetically related to ore mineralization.
Borehole penetration of mudstones of the Exploration Formation of the Talnakhskoye field is often complicated by collapse of borehole walls. The strong tectonic disturbance of the area and high rock pressure due to the great depth (2000 m) of the formation do not fully explain this phenomenon, since both emergency and accident-free wells have been recorded in equal conditions ...
Drilling operations at placer deposits are difficult due to the specific structure of placers. Incohesion, friability of sandy-pebble deposits, their water content, disorderliness, presence of boulders of different sizes complicate drilling in alluvial strata ...
Dolomitization of phosphorite ores increases the content of MqO, which worsens the quality of ores and in some cases makes them substandard, off-balance sheet. Some local areas of the deposit are subject to dolomitization. Naturally, it is desirable to identify them in the process of exploration work and exclude them from the balance reserves. ...
Литолого-палеофитологическое обоснование расчленения нижнепермских угленосных отложений Минусинского бассейна произведено на основании детального литолого-фациального и палеофитологического описания разреза по Изыхскому месторождению, где продуктивная толща (мощностью 1750 м ) развита наиболее полно и где прослеживаются осадки в возрастном диапазоне от карбона до перми ...
На Кайерканском месторождении проведено комплексное изучение изменения углей пластов X и IX (далдыканская свита Р ) на контактах с дайками долеритов для выявления характера связи между масштабами интрузий и приконтактовых зон измененного угля,, а также особенностей контактово-термального метаморфизма угля. На различных расстояниях от контактов с дайками прослежены изменения значений основных показателей угля: зольность, выход летучих, калорийность, содержание углерода, удельный вес, отражательная способность, микротвердость ...
