关键词: 准噶尔盆地, 春风油田, 超稠油, 形成机理, 开发技术, HNDS

Abstract: Chunfeng Oilfield on the western periphery of Junggar Basin is a super heavy oil field with “thin oil layer, low ground temperature and high viscosity.” If conventional steam stimulation technology is used, a lot of heat will be lost in the wellbore and the ground with steam heat limited in a small scope. Steam stimulation of straight well cannot make a breakthrough in productivity. This article studies the genesis mechanism of super heavy oil in Chunfeng Oilfield, pointing out that crude oil from Shawan formation came under strong biodegradation. The temperature of oil reservoir is only 26℃ with the crude viscosity 70000mPa·s. Under the condition of 60℃ , heavy oil turns into Newtonian fluid. Asphaltene in heavy oil is relatively high in molecular quality and strong in polarity. The C+H content in crude oil exceeds 95 percent while the impure atom content is relatively low. Cracking of hydrocarbons, when heated, calls for relatively low energy with the total of gum and asphaltene is lower than 20 percent, easy to reduce the viscosity. Based on this analysis of physical properties of the oil field, a development plan suitable for the characteristics of the oil field was formulated while the integrated technology, such as the horizontal well + steam stimulation + injection of nitrogen + injection of oil insoluble viscosity reducer, was developed for high-efficiency oilfield development.An annual crude oil productivity of 610,000 tons was constructed at a 3.0 percent oil production rate.As of March 2013, the HDNS technology has been successfully usedfor 257 wells of Chunfeng Oilfield withtheadditional oil output accumulated to 654,000tons.

Key words: Junggar Basin; ChunfengOilfield;superheavyoil; genesis mechanism; development technology;HNDS