| Annotation |
The article presents a study of the mineralogical and elemental composition of drill cuttings. Samples were selected from sludge pits of oil and gas condensate fields of the Irkutsk region – Yaraktinskoye and Markovskoye. The main aim of the research is to identify the geochemical and mineralogical particularity of drill cuttings, to determine the toxicity of this type of waste. The authors have used an integrated approach using such research methods as: X-ray powder diffraction, inductively coupled plasma mass spectrometry, scanning electron microscope, bioassay.
According to the results of the study, minerals such as quartz, calcite, dolomite prevail in the mineralogical composition of samples of drill cuttings. However, there are significant differences in the mineralogical composition of drill cuttings from wells with different types of drilling. The geochemical specificity of the studied drill cuttings was determined relative to the clark of the upper part of the continental crust. In general, the elemental composition of drill cuttings is different, but elements concentrated in elevated values relate mainly to heavy metals.
The value of the total pollution indicator calculated by the clark of concentration shows that the samples are of different degrees of pollution. A sample from the Yaraktinskoye field, taken at a well pad with production wells, has a high degree of contamination. A low degree of contamination includes a sample from the Markovskoye field.
The method of X-ray spectroscopy has revealed the mineral phases of elements such as Pb, Sn, Sr, Ba Fe, Ti. According to the results of toxicological analysis using the bioassay method, the studied drill cuttings are classified as moderately hazardous and low-hazardous wastes, as drill cuttings have a toxic effect on microalgae Scenedesmus quadricauda and crustaceans Daphia magna
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