Development of technogenic soil based on drill sludge formed in the process of well construction in the Vinno-Bannovsky oil field of the Samara region

Abstract

The mineralogical, chemical and gravimetric composition of drill cuttings formed during the construction of wells in the Vinno-Bannovskoye oil field in the Samara region has been studied. It was found that the cuttings included in the drill cuttings consist of the following rock-forming minerals - calcite, quartz, dolomite, wollastonite, iron-bearing ankermanite and ankerite. The excess of the gross content of the maximum permissible concentration (MPC) of heavy metals in drill cuttings is observed for lead, arsenic and mercury. The content of oil products is within 0.64 ± 0.27 g/kg and does not exceed the MPC for oil. A method is proposed for producing environmentally safe permeable technogenic soil by mechanical mixing of drill cuttings with natural sand, phosphogypsum and sorbent in a ratio of 53: 40: 2: 1, leading to a decrease in the toxic effect of pollutants by reducing their concentration and sorption on the sorbent. According to its physical and chemical characteristics, the soil obtained during the disposal of drill cuttings is technogenic dispersed soil in accordance with GOST 25100 - 2020 «Soils. Classification» and can be used in the construction of soil foundations of production, auxiliary sites.