EARLY WARNING METHOD, CONTROL METHOD AND SYSTEM FOR HAZARDOUS REGIME OF OIL AND GAS GATHERING AND TRANSFERRING RISER SYSTEM

摘要

Disclosed are an early warning method, a control method and a system for a hazardous regime of an oil and gas gathering and transferring riser system. Training is performed using a training support vector machine based on the principle of forming slugging between a normal submarine pipeline and the bottom of a riser and using slugging forming position parameters; the overall regime in the pipeline is then continuously and rapidly identified with differential pressure signals on at least three positions on the oil and gas gathering and transferring riser system, and a dimensionless mean value of the differential pressure signals is obtained; and by means of monitoring the formation of long slugging in the submarine pipeline and through the quick response of the differential pressure signals to the changes in flow, the early warning of the instability of a gas-liquid interface and the slugging caused by the pipeline structure is realized, and accordingly, it can be predicted that the slugging formation position is respectively at the submarine pipeline or the bottom of the riser, thereby realizing the accurate determination of the slugging position. After the early warning is given, there is enough time for a control device to respond so as to avoid the formation of a hazardous regime or avoid the damage caused thereby. The method has a high reliability for early warning and a low false alarm rate, and can significantly increase the margin of flowing security assurance.