Reliable combustion is essential for the efficient and reliable operation of aging offshore gas motor compressors fueled by associated petroleum gas (APG). This study investigated the combined influence of fuel composition, scavenging-air pressure, and compressor loading on combustion stability under real industrial conditions. Operational data were obtained from four low-speed 10GKNAM gas motor compressors operating on APG with elevated heavy-hydrocarbon content. Fuel composition was determined by gas chromatography, while combustion stability was evaluated using exhaust-gas temperatures measured in all engine cylinders together with scavenging-air pressure and compressor loading. Two dimensionless diagnostic indicators, the Combustion Stability Index (CSI) and the Temperature Dispersion Coefficient (TDC), were developed using routinely monitored operating parameters, providing a practical combustion-diagnostic approach without additional instrumentation. Although the investigated fuel exhibited increased combustion reactivity, fuel composition did not account for the observed differences in combustion stability because all compressors operated on essentially identical APG. Instead, scavenging-air pressure was identified as the dominant operational factor, whereas higher compressor loading provided an additional stabilizing effect. Increased scavenging-air pressure reduced exhaust-gas temperature dispersion and improved combustion uniformity, whereas the influence of compressor loading became more pronounced under adequate scavenging conditions. The proposed methodology provides a practical basis for quantitative combustion assessment using existing industrial monitoring systems and may support condition-based maintenance, operational optimization, and future development of predictive combustion-diagnostic approaches for aging offshore gas motor compressors.

В представленной статье рассмотрены вопросы глубокого охлаждения природного газа и его очистки от вредных компонентов и жидкой фазы. На основе технических возможностей, создаваемых соплом Лаваля для отделения свободной и парообразной жидкости, содержащейся в газе, приведены сведения о создании и применении в последние годы газодинамических сепараторов ведущими компаниями мира, а также отечественными учеными. Целью излагаемого в статье исследования является глубокое охлаждение природного газа за счет сверхзвукового движения для очистки на газораспределительной станции (ГРС), направляемого населению и прочим бытовых потребителям газа, от жидкости и вредных компонентов. Проанализированы технологические процессы и комплексы оборудования, созданные с использованием сверхзвукового движения природного газа, определены их преимущества и недостатки, а также дано их объяснение Ұсынылған мақалада табиғи газды терең салқындату және оны зиянды компоненттер мен сұйық фазадан тазарту мәселелері қарастырылған. Газ құрамындағы еркін және бу фазалы сұйықтықты бөлу үшін Лаваль сопласының техникалық мүмкіндіктеріне сүйене отырып, соңғы жылдары әлемдік жетекші компаниялар мен отандық ғалымдар жасаған газдинамикалық сепараторларды құру және қолдану туралы мәліметтер берілген. Мақалада баяндалған зерттеудің мақсаты – газ тарату станциясында (ГТС) халыққа және басқа тұрмыстық тұтынушыларға жеткізілетін газды сұйықтық пен зиянды компоненттерден тазарту үшін табиғи газды супердыбыстық қозғалыс арқылы терең салқындату. Супердыбыстық қозғалыс қолданылған табиғи газдың технологиялық процестері мен жабдық кешендері талданған, олардың артықшылықтары мен кемшіліктері анықталып, түсіндірмесі берілген This study investigates the deep cooling of natural gas and its purification from harmful components and liquid phases. Utilizing the technical capabilities of the Laval nozzle to separate free and vapor-phase liquids present in the gas, recent developments and applications of gas-dynamic separators by leading international companies and domestic researchers are reviewed. The primary objective of this research is to achieve deep cooling of natural gas through supersonic flow, enabling effective removal of liquids and harmful components at gas distribution stations (GDS) for supply to the population and other domestic consumers. Technological processes and equipment systems developed based on supersonic natural gas flow are analyzed, with their advantages and limitations identified and discusse

To investigate the viscoelasticity of the mixture, studies were conducted on the flow behavior of gas-liquid systems under various flow regimes in pipelines using an experimental laboratory setup. A solution of carbon dioxide in transformer oil was selected as the working fluid; therefore, gas mixing was carried out directly in the pipeline after the liquid was injected by a gear pump. The experiments were performed under laminar isothermal flow conditions with Reynolds numbers Re < 800. The injection of transformer oil with dissolved carbon dioxide was carried out at a pressure of 0.1–0.2 MPa. A constant pressure was maintained using a gas pressure regulator and monitored by a precision manometer. A series of experiments was carried out at different gas factors, where mixture flow rates were measured at various pressure drops. To visually observe the flow structure, glass tubes were used. It is well known that changes in the gas content of the mixture significantly affect the viscous and elastic properties of the system. One of the key characteristics of viscoelastic systems is the presence of both shear and normal stresses during flow. Considering this, a method is proposed to determine the viscoelastic properties of the gas-condensate flow based on analyzing the flow curve using the Cross method. According to this method, the experimental data points were transformed into the coordinate plane 1/ŋef = f(τ²) and approximated by a straight line. Based on the parameters of these curves, the viscosity and shear modulus were estimated for various gas content levels. Bibl. 15, Tab. 1, Fig. 2.