Mining method and system of oil sand

• Main Authors: ZHANG SHUAICHAO, LIU SHANGQI
• Format: Patent
• Language: Chinese; English
• Published: 31.05.2017
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention discloses a mining method and system of oil sand. The mining method comprises the following steps that at least one pair of horizontal injection-production well networks is arranged; steam is injected into an injection well and a production well with a first predetermined injection speed, and cyclic preheating is conducted; the oil reservoir temperature between the horizontal section of the injection well and the horizontal section of the production well is obtained, and when the oil reservoir temperature meets the predetermined requirement, it is shows that heat communicating is established between the injection well and the production well; at this time, steam injecting to the production well is stopped; steam is injected into the injection well with a second predetermined injection speed higher than the first predetermined injection speed, and oil extraction production is conducted in the production well; after a predetermined period of time, the position that a steam cavity development does