METHOD OF INHIBITOR SUPPLY AUTOMATIC CONTROL FOR PREVENTION OF THE HYDRATES FORMATION IN GAS GATHERING TAILS OF GAS CONDENSATE DEPOSITS LOCATED IN THE FAR NORTH REGIONS Russian patent published in 2018 - IPC E21B37/06 G05D27/00 

FIELD: gas industry.

SUBSTANCE: invention relates to the field of natural gas production and can be used to prevent hydrates formation and hydrates destruction in gas gathering tails (GGT) located in the Far North regions. Method comprises the hydrates formation inhibitor supply automatic system. System contains the electrically driven pump unit and the inhibitor take-off line from the reservoir, providing the inhibitor supply to the beginning of the GGT. After the produced fluid exit from GGT, the inhibitor aqueous solution is separated from it in the separator and its supply to the inhibitor regeneration shop. During this process, performing the continuous control over the inhibitor concentration in the aqueous solution of C_{2 act.}, entering to the regeneration, and in the regenerated inhibitor C_{1 act.}, supplied to the GGT, by means of concentration sensors, as well as the regenerated inhibitor flow rate F_{inhib_act.}, supplied to the GGT, which value is controlled by the regenerated inhibitor flow rate sensor. Regenerated inhibitor flow rate F_{ingib_fac.} signal is supplied to the PV feedback input to the regenerated inhibitor flow rate maintaining in the GGT PID regulator, which, with the help of the regulator valve located downstream of the pump unit in the inhibitor to the GGT supply pipeline, enables automatic maintaining of the preset inhibitor concentration in the entering to the regeneration aqueous solution. At this PID controller SP setting input, supplying the corrected regenerated inhibitor flow rate F_{inhib_calc_corr.}, which is determined taking into account the calculated by the APCS with a given discreteness of the regenerated inhibitor mass flow calculated value F_{inhib_calc.}. Regenerated inhibitor mass flow calculating algorithm F_{inhib_calc.} takes into account the regenerated inhibitor actual concentration C_{1 act.}, calculated is C_{2 calc.} and the actual C_2act value of the inhibitor concentration in the entering the regeneration aqueous solution.

EFFECT: technical result is increase the hydrocarbon field development efficiency and safety by eliminating of the hydrates formation in the GGT with the minimum possible inhibitor consumption.

5 cl, 4 dwg