Relevance. In order to obtain correct results on the filtration-capacity properties of rocks and subsequent calculation of hydrocarbon reserves, high-quality sample preparation is required. One of the stages of sample preparation is cleaning of rock pore space from hydrocarbons, salts, drilling mud residues and other inclusions. The most widespread method of rock cleaning is extraction, which, according to state and industry standards, is a mandatory stage of sample preparation before a standard set of studies. Often effective extraction is associated with peculiarities of composition and structure of objects of research, as the rock may be extracted from shallow depths, have a low degree of cementation, a partial or complete degree of cementation of grains by bitumen, cementing mineral may be sensitive to extractant and/or high temperature, and so on. All of the above complicates qualitative sample preparation and requires individual selection of solvent and extraction methods. Aim. To select a procedure and formulate recommendations to reduce the destructive effect of extraction on the core material of a particular field. In the present work the core material of the field located in the north of Samara region and possessing a set of negative factors was selected for study: the productive formation is located at a depth of 50–200 m, the rock is represented by weakly cemented and uncemented sandstones, oil saturation reaches 95%, oil viscosity is about 27000 cP under reservoir conditions. Due to low degree of cementation and high degree of hydrocarbon saturation the samples tend to fracture during hot extraction. It was known from previously studied wells of this field that up to 30% of samples after extraction are unusable. Methods. Two-stage extraction was considered: first, preliminary – “cold extraction” with six different solvents, assessment of the degree of hydrocarbon removal, the impact on core material destruction, and then “hot extraction” with chloroform, with justification of the choice of this particular solvent. Results and conclusions. Toluene is optimal for cold extraction. If we combine the method of preliminary, “cold extraction” with the method of “hot extraction” with chloroform, the duration of thermal effect on the samples is reduced from 9–10 to 5–7 days, which has a positive effect on the preservation of the structure and properties of the mineral skeleton of the rock.