Drilling sludge formed in the process of drilling wells using a drilling agent on a hydrocarbon basis looks like soft pasty mass of black color, with a distinct smell of petroleum products. Oil-based drill sludge has a high oil and chloride ions content, identified excessive concentrations of chromium 2.67 times. According to the degree of accumulation of heavy metals, that were distributed in the following order: manganese (Mn) > zinc (Zn) > copper (Cu) > chromium (Cr) > lead (Pb) > cobalt (Co) > arsenic (As) > mercury (Hg) > cadmium (Cd). The results of the particle size distribution indicate a significant proportion of physical clay, which peaks for the silt fraction-63.60 %. During the study of the waste drilling agent was found that it includes oil products which reached level of 9000 mg/kg, while the hydrogen index refers to a neutral medium-6.5 pH. The evaluation of the toxic effect of drilling waste according to the test-results has an acute toxic effect on the environment (hazard class IV). The significance of the research indicates the relevance of environmental assessment of drilling waste for the optimal choice of their subsequent disposal.

View the article online for updates and enhancements. shown good germinating ability of cultures-phytomeliorants (93,3%). 100% germinating ability was observed in meadow grass with a height of overground sprouts 10.7 cm, germinating ability of red fescue was 80% with height of overground sprouts 9.6 cm.

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The technology of utilization of drilling waste in the framework of pilot tests at an oil field is considered. The technology is based on a physicochemical method of disposal of drilling waste by introducing natural environmentally friendly components aimed at improving the water-physical and chemical properties of drilling waste. The basic technological scheme of utilization of drilling waste by pitless drilling is presented. The man-made soil obtained in the process of utilization of drilling waste is suitable for reclamation of adjacent (adjoining) industrial and auxiliary infrastructure, disturbed lands of temporary and permanent allotment of oil fields. The hydrogen index in the technogenic soil corresponded to the alkaline reaction of the medium and amounted to 8.8 pH. The content of oil products was at the level of 956 mg/kg. In terms of salinity, the technogenic soil was classified as non-saline soil (<0.5%).

Abstract. The area of natural saline lands in Russia is about 30 million hectares. At present, the growth of technogenically saline areas is associated with the extraction of minerals (agro-ore) and the formation of drill pits when drilling wells for the purpose of exploration and production of hydrocarbons. The number of drilling pits with a high salt content in the Khanty-Mansiysk autonomous okrug is about 3 thousand, about the same number of them in the Yamal-Nenets autonomous okrug, in the south of the Tyumen region their number is increasing in the Uvat region. Reclamation of these territories includes technical and biological stages of reclamation. The biological stage is associated with the use of phytomeliorant cultures. The inclusion of a legume component in the composition of phytomeliorants assumes its joint use with the preparation of an active strain of nodule bacteria. The aim of the research is to identify the most salt-tolerant strain of lupine nodule bacteria at different chemistry and degree of salinity of the environment. Research methodology and methods. Laboratory experiments in Petri dishes were used to test lupine nodule bacteria for salt resistance and salinity chemistry. Nodule bacteria of lupine strains 363a, 367a, 375a were taken directly from rhizotorphin preparations, the degree of dilution was brought to a certain titer corresponding to about 80 colonies per Petri dish. Nodule bacteria for melilot were represented by strains 282, 292 (CL) and 291, and for alfalfa, respectively, 451b, 404b, 412b, 423b, 408b and 425a. They were seeded with the same titer. Results. The presented results of experiments showed that colonies of lupine nodule bacteria react extremely negatively to the salt concentration in the nutrient medium of 0.3 % or higher. This is typical for both neutral and soda salinity. Of the three studied strains of nodule bacteria, sample 367a was the most salt-resistant. Of the presented strains of sweet clover and alfalfa, strains 282 and 423b had the highest salt tolerance, respectively. Scientific novelty. For the first time, strains of lupine nodule bacteria have been tested for salt tolerance in relation to different chemistry and degree of salinity identical to technogenic soils and saline soils.