Vol 116

Flushing fluid flow rate is as important a parameter of the drilling mode as axial load and rotational speed of the drilling tool.

In the design of automated drilling rigs (in particular, underwater drilling machines) is the task of determining the technical and technological parameters of their individual components.

When studying the motion of liquids and gases in a variety of technological processes of drilling wells widely used concepts of hydroaeromechanics, expressing the laws of conservation of mass, momentum and energy.

Drilling a huge number of exploration wells within the Leningrad oil shale deposit leads to a significant change in the regime and balance of surface and ground waters of the area, which causes serious environmental changes in the environment.

The main technological feature of operational well plugging with dry quick-setting mixtures (QSM) is the delivery of a certain amount of plugging material to a given interval, its mixing with water and processing by special plugging devices directly in the zone of geological sedimentation.

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.

Introduction in the practice of drilling works of the technology of diamond drilling of wells with flushing with foam cleaning agents has shown the necessity of development of drilling mode parameters taking into account the influence of the temperature factor.

The most important functions of foam as a flushing agent during drilling (carrying and holding capacity, colmatizing effect, etc.) are closely related to the rheological properties and stability.

The method of drilling rocks by fusion is promising for well sinking due to its inherent advantages: no rotation of the drill string; simultaneous with drilling dyeing of well walls with vitrified melt; reduction of time for downhole operations when using a hose cable; simplification of the task of automating the drilling process, etc.

In recent years, increasing attention to the Antarctic continent has been shown by many countries of the world.

Within the framework of the all-union complex research program "World Ocean" under the economic contract with the Institute of Microbiology of the USSR Academy of Sciences, the development of borehole methods of sampling from glacial strata, which are suitable for their further microbiological study is underway.

To date, rich material has been accumulated on the properties and material composition of fresh ice, which was obtained during glaciological, geophysical, geochemical and microbiological studies of the ice core of the Arctic and Antarctic.

A major role in the study of ice sheets in polar regions and high-mountainous areas is played by borehole drilling, carried out mainly with the help of thermal and electromechanical drilling shells on a load-bearing cable.

A detailed study of continental ice sheets and glaciers at depth is possible only by drilling boreholes with ice core sampling.

It is known from the practice of drilling wells (both exploratory and special purpose) during mining and construction works that a significant proportion of well accidents is caused by drill pipe string breaks.

Until recently, bench studies on the development of drilling mode parameters with diamond tools were carried out without taking into account the influence of downhole pressure.

The peculiarity of the method of drilling with the use of removable tools is the unobstructed movement of the tools inside the drill string.