Petroleum unsteady flow in pipe-line under presence of wall layer precipitations

Nonisothermal flow of high-paraffin petroleum in underground pipe-line is examined with taking into consideration of precipitation accumulation on internal surface. Mathematical model of petroleum motion in the pipe-line consists of motion equation, unbrokenness and energy, thermal conductivity equations for the layer, for pipe-line wall, for soil surrounding pipe-line and single meaning conditions. Method of finite differences is used in the work. Calculations on computer are defined for stationary and non-stationary regimes of petroleum flow in case of 'clean' and polluted by paraffin pipe-line are cited, different graphics (for rate distribution, current internal diameter, temperature and pressure in pipe-line in various time moments and for various sense of productivity) are constructed. Evolution of different regimes of flow is given, influence of pipe-line pollution by paraffin on its capacity is analyzed