Environmental risk assessment under oil and gas wells workover and revamping
In the article the methodology for environmental risk assessment under oil and gas well workover and revamping is considered; environmental risks imply the probability of dangerous and emergency situations occurrence within certain types of work involving the consequences that constitute a danger for people and environment. The accidents representing the main danger for the ecological situation in the area of the well being revamped are determined. The emergency situation occurrence frequency calculation is carried out; it reflects the highest possible dangerous substance release and the formation of maximum affecting factors coverage zones; the main reasons of oil, gas, water shows and open blowouts occurrence in the fields of the Western Siberia are given. Calculation rules are determined on the base of which the list of target values for environmental risk assessment while the anthropogenic impact on the environment is established. The estimation of economic and ecological values is made with regard to stand composition and normality, trunk timber volume, berry and mushroom resources, availability and number of game animals and fish.