INHIBITOR SUPPLY AUTOMATIC CONTROL METHOD FOR THE HYDRATES FORMATION PREVENTION IN LOCATED IN THE FAR NORTH REGIONS INTEGRATED / PRELIMINARY GAS PREPARATION INSTALLATIONS GATHERING SYSTEMS Russian patent published in 2019 - IPC E21B37/06 

FIELD: gas industry.

SUBSTANCE: invention relates to the field of natural gas production, in particular to the hydrates formation prevention in the integrated / preliminary gas treatment units (IGTU/PGTU) collecting systems. Method comprises the individual gas gathering plume (GGP) connection to each of the gas producing wells pad, the regenerated inhibitor controlled volume supplying through the separate pipeline to the each GGP beginning, each GGP equipping with sensors for the produced gas flow rate, its temperature and pressure monitoring, installation on each plume of the production control valve, all gas collection plumes ends connection to the gas gathering manifold, from which the produced gas enters the mechanical impurities and the inhibitor aqueous solution purification separator, the inhibitor aqueous solution removal to the regeneration. During the method implementation a telemetry system is used, coupled with the automated process control system ACS IGTU/PGTU. With its help, with a given discreteness, performing the sequential polling of installed at the beginning and at the end of all GGP pressure, temperature and gas flow sensors. Simultaneously with the telemetry system, the ACS IGTU/PGTU interrogates the regenerated inhibitor actual concentration sensor at the regenerated inhibitor buffer capacity output, and the inhibitor aqueous solution concentration sensor on its supply pipeline to the regeneration workshop. After the sensors interrogation, the ACS records this information and all received information from the telemetry system into its database. After that, the ACS IGTU/PGTU performs their processing to develop control solutions for the inhibitor individual supply for each plume. In case of the hydrates formation process in one of the GGP beginning detection, the ACS will issue a corresponding message to the operator. Next, in the real time mode, using recorded in the database measurement results and being implemented processes standardized mathematical models, by calculation the ACS determines the regenerated inhibitor required consumption actual value, which must be submitted to the GGP, where the hydrates formation process beginning is detected. ACS issues this value as a task (setpoint) to the implemented on the ACS basis corresponding PID-regulator, which controls the inhibitor flow control valve in the plume, where the hydrates formation process is detected. At the same time, based on the available in its database regulatory information the ACS determines the PID controller operation mode by changing the proportionality coefficient applied to its corresponding input to control the inhibitor supply dynamics. At that, the regulatory reference information content in the ACS IGTU/PGTU database is regularly updated online based on the wells hydrodynamic and periodic field and laboratory studies results.

EFFECT: minimizing the inhibitor consumption, increasing the production and well production preparation efficiency.

1 cl, 2 dwg