Evaluation of Structural and Mechanical Properties and Phase Transitions of Gas Condensate

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Journal of Engineering Physics and Thermophysics, Vol. 93, No. 5, September, 2020

EVALUATION OF STRUCTURAL AND MECHANICAL PROPERTIES AND PHASE TRANSITIONS OF GAS CONDENSATE A. A. Boitsova and S. V. Strokin

UDC 665.7.033.22,665.7.035.6

The physical and chemical properties of a multicomponent disperse system, viz. gas condensate, are presented. The structural and mechanical properties of the sample and the phase transitions that occur when the pumping temperature decreases at startup and steady flow regimes have been determined. The values of the activation energy corresponding to the liquid and quasi-liquid types have been estimated. Optimum temperature values have been obtained for transportation of gas condensate on the Urengoy–Purpe condensate pipeline section with account for the flow regime. Keywords: rheology, gas condensate, structural and mechanical properties, phase transition, activation energy of a viscous flow, flow regime. Introduction. The current stage of development of the oil and gas industry of the Russian Federation is characterized by continuous variation of the qualitative state of the raw materials base. The main problem of both the Russian and world fuel and energy complex is the increase in the production share of heavy sour crude characterized by a low yield of light distillates and a high content of heavy residues reducing the value of such raw hydrocarbon materials [1]. In connection with this, it is worth resorting to the use of other sources of hydrocarbons to satisfy the needs of industry for light fractions with a low content of impurities. In this context, gas condensate fields are a strategically important source. The gas condensate produced during their exploitation is characterized by a high yield of gasoline, kerosene, and diesel fractions, and the heavy residue does not contain asphaltenes and can be used for the production of high-quality oil [2]. The Urengoy oil and gas condensate field should be singled out among these deposits. The ultimate geological reserves of the Achimov deposits of the Urengoy field are estimated to be 3.0 trillion m3 of natural gas and 900 million tons of gas condensate. The development of these deposits makes it possible to ensure 10% of the Russian gas industry supply [3]. This fact determines their high energy significance, resulting in the need for solving a number of problems related to the production, transportation, and processing of hydrocarbon raw materials. One such problem is the evaluation of rheological and structural-mechanical properties. The rheological properties of hydrocarbon raw materials (for example, oil, gas condensate, and products of their processing) to a great extent determine the choice of the regime of its production, processing, and transportation, and therefore, rheological tests of multicomponent hydrocarbon mixtures that make it possible not only to determine the structural and mechanical characteristics of raw liquids but also to predict the properties of the products of their mixing and processing as well as to sele