Drilling technique of fishbone horizontal well Zhan18-ZP1

There are abundant shallow heavy oil resources in Shengli Oilfield. Heavy oil reservoirs in the oilfield have soft formation and shallow burial depth which ranges from 800 m to 1200 m in most blocks. Generally they feature in sensitive formation, poor liquid supplying capacity, low production capacity and quickly-declined production. No good development results have been obtained, although multiple drilling technologies have been applied in the past years, such as directional well technologies and horizontal well technologies. Fishbone horizontal well technology is newly developed to enhance oil recovery. But it is difficult to be applied in heavy oil reservoir, owing to some special technical problems. Through introducing the field application of Zhan18-ZP1, the first heavy oil thermal recovery well in the oilfield, some technical problems of the fishbone horizontal well technology in heavy oil reservoir are analyzed, which may bee good reference to the popularization and application in heavy oil thermal recovery blocks in the future.