METHOD FOR TRANSPORTING HYDROCARBON LIQUID IN MAIN PIPELINE Russian patent published in 2006 - IPC F17D1/16 

FIELD: oil and gas industry branches, namely transporting hydrocarbon liquid such as oil, oil products, condensed gas along main pipeline.

SUBSTANCE: method for transporting hydrocarbon liquid along main pipeline comprises steps of sustaining temperature of flow corresponding to admissible pressure value of saturated vapor in pipeline in front of reservoir yard and pump stations. Temperature of liquid flow is sustained by introducing into pipeline polymeric additive. During process of liquid transportation temperature of flow is determined in front of reservoirs and pump stations and it is compared with temperature corresponding to admissible pressure value of saturated vapor in pipeline in front of reservoir yard and pump stations. Taking into account difference of said temperatures factor of influence of additive upon temperature of liquid flow caused by friction heat is determined with use of given relation: Ψ = 1 +Ts/Tf - (Tk* - Tin exp(-Shu)/Tf[1 - exp(-Shu)] where Ts - soil temperature; Tk* - temperature of liquid flow in end portion of pipeline when pressure value of saturated vapor is equal to admissible value; Tf = gMi/πDK, -temperature caused by friction heat ; Tin -initial temperature of oil; Shu = (πD x K x L)/Co x M, Shuckoff number, Co - oil heat capacity; L- pipeline length, D - diameter of pipeline; K -coefficient of heat transfer, M - mass flow rate of oil, i -hydraulic gradient, g - gravity value. Concentration of polymeric additive is graphically plotted according to determined influence factor.

EFFECT: lowered values caused by evaporation, prevention of double-phase flows occurring in pipeline, optimal pumping mode of liquid, simplified restoration works after emergency in linear portions of main pipelines.

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