METHOD FOR CLEARING OF HEAT-EXCHANGERS FROM ASPHALT-RESIN-WAX DEPOSITS IN HEAT RECUPERATION UNIT Russian patent published in 2008 - IPC F28G9/00 B08B9/00 

FIELD: clearing of heat exchangers from asphalt-resin-wax deposits (ARWD), applicable in oil production.

SUBSTANCE: the method consists in the fact that a system of connection of the elements in the operating condition is made, that has a system of supply of cold crude oil from the wells, heat recuperation unit (HRU), system of discharge of crude heated oil from the HRU to the terminal separation plant (TSP) of crude oil, preliminary water discharge reservoir (WDR), desalting and dehydration plant (DDP) for commercial oil, system for delivery of hot finished separated oil from the TSP to the commercial oil reservoir. Cold crude oil from the wells is directed to the HRU, heated in the HRU is the cold crude oil by means of the exchange with the flow of hot finished separated oil. The hot finished separated oil is cooled down by heat exchange with the flow of cold crude oil. Monitoring of the temperature of the heated and cooled oil is accomplished, monitoring of the liquid level in the bullets of the commercial oil TSP is performed. Use is made of the clearing condition that consists in the fact that the flow of cold crude oil is completely overlapped, hot finished separated oil at a temperature 41 to 43 C is supplied, the ARWD is heated and diluted by the flow of hot finished separated oil; the ARWD is discharged from the ducts of hot finished separated oil by the same flow supplied to the HRP in the clearing condition at a speed making up 5 to 30 per cent of the speed of this flow in the operating condition, then the heated and diluted ARWD accumulated in the clearing condition is discharged from the ducts that are used for passage of the flow of cold crude oil by the same flow in the operating position.

EFFECT: reduced net cost of oil.

2 cl, 1 dwg