ABOUT THE FEATURES OF SURROUNDING WATER INVOLVEMENT IN THE JET FOR THE PROBLEM ON MAN-MADE OIL SPILLS

Abstract

Every year, the scale of oil development in the Russian Federation is growing. A third of the hydrocarbons produced are in the offshore zone. In Russia, offshore oil production takes place in the Okhotsk, Baltic, Caspian and Pechora Seas. Oil production in a pipeline is a technologically complex process, thereby increasing the relevance of creating safe processes for the production, transportation and processing of petroleum products.If safety precautions are neglected, annual diagnostic and repair work is ignored, factors may arise that provoke the occurrence of man-made accidents leading to natural disasters. The consequences of accidental oil spills lead to the destruction of flora and fauna in the environment. For the complete elimination of an oil spill, considerable economic, technological and time resources are required.An offshore oil spill results in the formation of submerged jets that spread hydrocarbons into the surrounding fluid. Predicting the behavior of this submerged jet, it is possible to accelerate the process of oil spill response.The paper considers the problem of formation of a damaged source of oil products. This source could be formed as a result of oil pipeline damage. According to the condition of the problem, this source is located at the bottom of the reservoir and has the following thermophysical characteristics: oil volume flow, temperature, density, etc. The problem considers the characteristics of the medium, which are characterized by a small depth of the oil pipeline, so the formation of hydrate is not taken into account.To solve the problem, the integral Lagrangian control volumes method (ILCVM) is used. According to this method, the submerged jet is considered as a sequence of cylindrical control volumes, which have their own characteristics, such as radius, height, density, liquid content ratio, temperature, velocity, etc. Depending on the movement of the control volume, the above parameters are recalculated. This submerged jet is also affected by the characteristics of the environment: liquid temperature, water salinity, and the presence of an undercurrent.As a result of using ILCVM, a mathematical model that contains the equations of conservation of momentum, mass and energy was built For the accuracy of the model, the parameter of the involvement of the surrounding fluid in the jet is considered in detail. Based on the mathematical model, calculations were carried out for various formats of water entrainment in the jet for cases of oil spills. Graphs were constructed to identify the dependencies of the thermophysical characteristics.