The physical theories behind Measurement-While-Drilling design should be rich in scientific challenges, engineering principles and mathematical elegance. To develop the next generation of high-data-rate tools, these must be understood and applied unfailingly without compromise. But one does not simply peruse the latest petroleum books, state-of-the-art reviews, or the most recent patents to understand their teachings. Most descriptions are just wrong. The science itself does not exist.

Our modern world needs more and more resources provided by our planet Earth: foods, water, raw materials, ores and energy, either natural (sun, wind, hydraulic, tidal, geothermal, nuclear) or fossil (coal, petroleum, gas). An on-going effort in research and exploration is therefore necessary to discover, exploit and develop them. And, in this effort, it is better to rely on information coming from fundamental research, development of technology and geological studies, than on hazard and luck! Geological studies more and more rely on different sources of information coming from use of new analytical methods and physical sensors such as well logging tools. <...>

Once the prospect generation is made based on seismic and geological surveys, location for drilling is released based on the most probable structure in the hydrocarbon point of view. The most probable structure is based on the structure identified with

This example shows the "multi-track" recording of the interval between 11 396 and 11441 feet of a well drilled in 1972 in a dominantly shaly deltaic series with thin sandy and dolomitic crossbedding.

Drilling occurs in all nations around the world, and in the seas surrounding those nations, using drilling rigs to bore into the earth.

Руководство предназначено для всех промыслово-геофизических, нефтегазодобывающих предприятий, управлений и цехов по повышению нефтеотдачи пластов и капитальному ремонту скважин, научно-исследовательских и проектных организаций, выполняющих геофизические исследования я использующих результаты этих исследований при планировании, проведении и контроле качества капитального ремонта скважин. <...>

THREE A S TM STANDARDS are available for sampling coal: ASTM Practice for Collection of Channel Samples of Coal in the Mine (D 4596), ASTM Test Methods for Collection of a Gross Sample of Coal (D 2234), and ASTM Practice for Collection of Coal Samples from Core (D 5192). The first two standards are applicable only to existing mining operations, test pits, or transportation of coal.

The earth is a giant system including the atmosphere, hydrosphere, lithosphere, biosphere, and the mantle, core and planetary space. Earth science is the study on the substance composition, origin, formation, evolution and the interaction of each part of the earth system. In the late 20th century, the earth science developed towards the earth system science, focusing on the lithosphere, and gradually extended to the relationship and interaction with the other layers.