IMPROVEMENTS RELATING TO PRACTICAL TESTS TO DETERMINE THE PRESENCE OF NATURAL HYDROCARBONS AT THE BOTTOM OF A SURVEY

摘要

THE INVENTION CONCERNS IMPROVEMENTS RELATING TO PRACTICAL TESTS TO DETERMINE THE PRESENCE OF NATURAL HYDROCARBONS AT THE BOTTOM OF A BOREHOLE. /P P IN ORDER TO OBTAIN A RELIABLE TEST TO DETECT THE PRESENCE OF '' NATURAL HYDROCARBONS AT THE BOTTOM OF A BORING HOLE DURING BORING WITH OIL-BASED MUD, A SAMPLE OF THE ROCK FRACTIONS DETACHED TO THE NEIGHBORHOOD OF THE DRILLING TREPAN BY THE CIRCULATING MUD CURRENT, IS COLLECTED. THE SAMPLE OR A FLUID PREPARED FROM IT IS PLACED IN A SPECTROMETER AND IS EXCITED WITH ELECTROMAGNETIC RADIATIONS OF ONE OR MORE WAVELENGTHS. /P P THE INVENTION IS USED FOR RELIABLY INDICATE THE TIME WHEN LEVELS CONTAINING NATURAL HYDROCARBONS ARE REACHED WHEN DRILLING AN OIL WELL.