METHOD FOR DRYING SEA GAS PIPELINE CAVITY AFTER HYDRAULIC TESTS

摘要

FIELD: oil and gas industry.;SUBSTANCE: cavity of the sea gas pipeline is additionally dried to specified moisture values simultaneously with evacuation by blowing the cavity with nitrogen. In this case, before starting the introduction of nitrogen into the dried sea gas pipeline, a change of working parameters in time which characterize the process of filling the sea gas pipeline with nitrogen is simulated, according to simulation results the threshold values of the working parameters for filling the sea gas pipeline with nitrogen are set, the cavity of the sea gas pipeline is filled with nitrogen, when filling the nitrogen, the working parameters are continuously measured and their change during mixing of nitrogen and air in the cavity of the sea gas pipeline is controlled. Then the occurrence of their threshold values is recorded and the parameters to control the modes for filling the cavity of the sea gas pipeline are set. After holding the overall medium in the cavity of the sea gas pipeline up to stabilization of dew point temperature in water, pressure and nitrogen concentration, its drying is completed.;EFFECT: invention should increase the reliability and safety of the sea gas pipelines, reduce time for drying the cavity of the sea gas lines after the hydraulic tests.;2 cl, 2 dwg, 3 tbl