System of Automatic Hydrate Growth Inhibitor Supply to the Gas Field Flowline

摘要

In the framework of reservoir engineering it is necessary to consider that hydrates could occur on every stage of gas producing, gas conditioning and gas transportation. This problem is very important, especially for wells and flowlines of the high north foundations. Operation conditions without gas hydrate formation could be provided by different ways. The most common way is the hydrate growth inhibitor injection to the gas flow. The most useful inhibitors are methanol or the water-methanol solution. This inhibitor is injected by special devices (systems). The main problem of such systems is addressless inhibitor injection, that's why, inhibitor consumption increases whereas the gas-hydration control efficiency decreases. Some protecting points are selected in the gas flowline in the offered system of the automatic hydrate growth inhibitor feed. At these points there is the highest probability of gas hydrate formation. The temperature and pressure sensors the inhibitor proportioning device are located at these points. This device consists of the operated valve, the back-pressure valve and the regulating disk, and it is connected to the methanol accumulator bottle by the methanol pipeline. During gas hydrate formation the pressure difference occurs, and this pressure difference is radioed to the operator station. Further, the dangerous section is detected and the control signal is sent to the regulating reducing gear train. So, methanol is fed to the dangerous section where gas hydrate formation was detected. The offered system use allows one to optimize the inhibitor's flow, to increase reliability of any gas field exploitation even without a full electricity supply system.