EXTRACTION METHOD OF LIQUEFIED OR GASSED HYDROCARBON FROM UNDERGROUND HYDROCARBON HEADER (VERSIONS) Russian patent published in 2012 - IPC E21B43/243 

FIELD: oil and gas industry.

SUBSTANCE: extraction method of liquefied or gassed hydrocarbon from underground hydrocarbon header involves the following: provision at least of one production well mainly having horizontal shaft located relatively low in the header, and provided with near-wellbore part on one end and bottomhole part on the opposite end; at that, horizontal shaft provides liquefied hydrocarbon supply to inner volume of horizontal shaft. Production well mainly has vertical section connected to horizontal shaft near its near-wellbore part; provision of tubing string inside production well located within the limits of vertical section and within the limits at least of some part of horizontal shaft for collection of hydrocarbon that flows to horizontal shaft; pumping of the medium that is chosen from the group of media including, either separately or in a combination, non-oxidising gas, steam, water or carbon dioxide to production well; oxidising gas supply to underground header, at least first in the location of vertical section of production well or near vertical section of production well; lighting-up of hydrocarbon in hydrocarbon header near vertical section of production well in order to initiate the firing of some part of hydrocarbon in hydrocarbon header near vertical section and creation of burning front that spreads from injection well at least in the direction along horizontal shaft to its bottomhole part; provision of run-off of heated liquefied hydrocarbon from upper zones of the header and collection in horizontal shaft; removal of hydrocarbon that has run off to horizontal shaft from production well via tubing string. Inventions have been developed in dependent claims.

EFFECT: avoiding the need for a separate platform for pumping of oxidising gas, due to which costs are reduced and environmental hazard is decreased; avoiding the possibility of displacement of oxidising gas to horizontal shaft of production well.

17 cl, 8 dwg