Influential factors analysis of single well nitrogen injection in fracture-vug type reservoirs of Tahe oilfield

With the increase of the water flooding rounds,the production effect of fracture-vug type reservoirs of Tahe oilfield became poor.Single well nitrogen injection experiment was carried out in2012 and the oil production increased obviously.Through a large number of field statistics,the analysis of karst geological setting,tectonic elements,reservoir types,seismic reflection characteristics and dynamic characteristics of gas injection effect and the characteristics of Tahe oilfield has been done,which provided guidance for gas injection wells and evaluation in the future.