METHOD FOR AUTOMATIC MAINTENANCE OF DENSITY OF UNSTABLE GAS CONDENSATE, SUPPLIED TO MAIN CONDENSATE LINE, AT INSTALLATIONS OF LOW-TEMPERATURE GAS SEPARATION IN AREAS OF EXTREME NORTH

摘要

FIELD: oil and gas industry.;SUBSTANCE: invention relates to the field of extraction and preparation of gas and gas condensate to long-distance transport, in particular to automatic maintenance of low-temperature gas separation of density of unstable gas condensate (UGC) supplied to main condensate line (MCL) in regions of Extreme North. Proposed method comprises purification of gas-condensate mixture from mechanical admixtures in low-temperature gas separation unit and separation into UGC, gas and water solution of inhibitor (WSI). Then they are discharged from this unit into separator of liquids for degassing. From the WSI separator is withdrawn for regeneration of the inhibitor in the inhibitor regeneration shop, and UGC are supplied by the pump into the MCL. To control UGC density, the automated process control system (APCS) controls the density sensor of the UGC density, which is supplied to the MCL. Simultaneously, APCS controls pressure of weathering gas in degassing separator by means of pressure sensor and compares it with task, the value of which is determined automatically by cascade of two proportional-integrally differentiating (PID) regulators.;EFFECT: control and maintaining specified density of UGC.;1 cl, 2 dwg