The Investigation of the Composition of Pipeline Gas-liquid Flows and the Effect of Their Harmful Impurities on the Modes of Pumping, Energy Requirements of Transportation n

Abstract

Based on the analysis of the composition of gas-liquid flows of various pipelines (trunk, field and gathering gas pipelines, oil pipelines, heat pipelines, water pipelines), it is established that diverse harmful impurities are contained in the interior of almost all operated metal pipelines, regardless of the purpose of pipelines use. In most cases, pipelines contain a complex multicomponent mixture of harmful impurities of various origins: gas conden-sate, water, machine oil, products of in-line corrosion, rock particles removed from the well, incrustation exfoliat-ed from the pipes, paraffins, various mineral salts, sludge deposits, sand, soil, biofilm, etc. The types and properties of distinctive harmful impurities positioned in the interior of various metal pipelines are described; the reasons for their presence in pipeline gas-liquid flows are determined. Depending on the purpose of the pipeline, harmful im-purities can be accumulated in its interior, be sedimentated on the internal walls or move in the flow of the trans-ported product. The parameters influencing significantly the accumulation in the interior of various pipelines and the sedimentation of various harmful impurities on the inner walls of pipelines are considered. Possible locations of their accumulation or sedimentation are presented. The analysis of the negative consequences that occur in the case of accumulation or sedimentation of harmful impurities in the interior of the pipelines, their movement along the pipeline and collision with the wall of shaped elements (bends, T-bends, adapters, etc.) is made. The author presents the main criteria according to which the hydraulic condition of pipelines polluted with harmful impuri-ties is evaluated, and on which energy requirements of transportation depend.