| Supper heavy oil occur widespread in liaohe oil field . The yearly production increase largely since it tested successfully by huff and puff in 1996. The production rate of supper heavy oil is a important factor for keep production stableness of liaohe oil field . Because the character of super heavy oil is very differential it is very difficult to develop supper heavy oil .It is necessary to make research for developing super heavy oil .Development scheme is a critical parameter to influence the ultimate recovery factor of super heavy oil . By investigating the case history of developing super heavy oil in different country and analyzing different development scheme which include huff and puff % steam drive steam-flood assistant gravity drained(SAGD), fracture-assisted steamflood technology (FAST) ., combustion drive .fracture-assisted steamflood technology (FAST) is a successful development scheme for super heavy oil .The advantage of facture-assisted steamflood technology(FAST)include:(1) It can increase thermal efficiency and steam swept volume by steam overlap in formation.(2) It can create thermal interconnection between production well and injection well inject steam with high velocity and pressure which high than fracture pressure .(3) It can convert steam drive during short time without more period huff and puff.(4) Fracture-assisted steamflood technology(FAST) can be used in thin layer which depth shallower than 1000 meters heavy oil reservoir with thick bed special heavy oil reservoir, super heavy oil reservoir, heavy oil reservoir with bottom water.(5) The rate of oil production and recovery efficiency of fracture-assisted steamflood technology are very high and the economic benefit is very good with short payback period.Du84-69-69 well group are used to make geological model. Based on the theory and the computing method of fracture-assisted steamflood technology , the numerical simulation are be carried by STARS simulation software. The parameters of fracture , the parameters of production well during huff and puff ., the time to convert steam drive the parameters of perforations adding of production wells and injection wells -, the parameters of fracture-assisted steamflood technology and the prediction of fracture-assisted steamflood technology are finished in the research . The conclusion of the research include:(1) Fracture-assisted steamflood technology can be used to develop super heavy oil in liaohe oil field.(2) The best parameters of fracture include:The best location to fracture is shallower 5 meters to bottom surface in oil formation.The best height of fracture are 1-2 cm.The best permeability of fracture which fractured by hydraulic fracturing are 10-14 u m2.(3) Production well do not perforations adding during huff and puff.(4) The best parameters of production well during huff and puff include:The best steam injection rate of production well is 1500 tons during the first period huffand puff.The best steam injection rate of production well are 200-300t/d during the first periodhuff and puff.The steam quality injected into oil formation must bigger than 40% during the firstperiod huff and puff.The best soak time of steam injection are 3-5days during the first period huff and puff.The best flush production rate of production well is 40t/d during the first period huff andpuff.(5) The time when finished the first period huff and puff is the best convert steam drive time .(6) The best location to perforated adding is upper 5 meters to fracture and the best thickness to perforated adding is 1 Smeters.(7) The best parameters of fracture-assisted steamflood technology include: The best steam injection rate of injection well are 140-160t/d.The steam quality injected into oil formation must bigger than 40%. The best production-injection ratio is 1.2 .(8) The ultimate recover factor of fracture-assisted steamflood technology by prediction is 50.4% and oil steam ratio is 0.23.Based on the research , f... |
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