In the present report the algorithm of realization on the computer of the solution of a conjugated problem of thermal interaction of the subsea pipeline ~4th environment is formulated and results of the prediction of change of conditions of operation of projected pipeline system during the natural gas transport from Schtokmanovskoe gas condensate field to the shoreline zone are considered. The offered method of the analysis is based on use of set of analytical and numerical mathematical models, describing processes thermogasdynamics and heat mass transfer at the transport of natural gas. The peculiarities of natural gas transport from Schtokmanovskoe gas condensate field are stipulated by there are not compressor stations throughout the marine route (560 km up to coast) and complicated geotechnical and climatic conditions (large depths of Barentsevo sea, large elevation differences of a relief seabed, low temperatures of a sea water and others).
In the present report actual problems of the natural gas transport from Schtokmanovskoe gas condensate field, located in Barentsevo sea on distance about 560 km from coast are considered as well as a technique of calculation of change of pressure and temperature of gas along the pipeline from their initial values at the deposit (T0 = 50 °C; P0 = 15 MPa, P0 = 16 MPa and P0 = 17 MPa) up to a shoreline is summarized. The examples are given for ~"o constructive decisions, when string of the pipeline is welded from pipes by a diameter of 48 in. and 40 in. The transport of natural gas throughout the pipeline is accompanied by change of initial pressure and temperature of gas due to Joule-Tomson effect of gas along the pipeline, and also intensive heat transfer with an environment, so the temperature of gas can decreases below 0 °C.
