Gas-assisted SAGD method for exploiting super heavy oil

摘要: The invention relates to a gas-assisted SAGD method for exploiting super heavy oil; the selecting layer thickness is 530m, remaining oil saturation more than 0.50, 10.0m, horizontal permeability 250md, ratio of vertical 0.1, porosity 0.20, continuous distributed impermeable clay and intercalated shale pools do not exist in layer; well drilled between soaking wells, spacing 35m or pair wells are at bottom layer, distance 6m; swallowing carried out 3 stages, when hot communication formed used inject steam continuously, production years, then nitrogen until underground volume 0.5 total injectionrate 0.10PV, injected injection rate 1.4m /d.ha.m, dryness 70%, production-injection maintained 1.2; recovery percent increased by 6.0-9.0% oil-steam improved 0.02-0.05.