This article discusses some aspects of the methodology for preparing sludge and core samples for lithological and petrophysical studies. Methods for obtaining rockmaterial(sludge, core) are described interms of determiningthemoment of openingthe reservoir layer,tyingthe core in depth, and sampling the sludge. A sludge collector has been proposed that makes it possible to obtain sludge of overall fractions washed from the drilling fluid.
