关键词: 海上油田, 多元热流体, 开采, 技术, 研究, 实践

Abstract: Steam flooding and stimulation processes have been proven as effective technologies for production of heavy oil. The production factor of those processes can exceed 30 percent for high-quality heavy oil reservoirs. However, offshore heavy oil reservoirs are relatively thin in layers and large in buried depth. Heat loss and low steam dryness seriously affect economic feasibility of thermal recovery. In the light of offshore oil reservoir characteristics, recovery technology of multiple thermal fluids injects steam and non-condensate gas into oil reservoirs. The injected gas not only enlarges the influencing scope for thermal production but also reduces viscosity together with the injected heat, thus lowering the requirements for thermal production, reducing heat loss and improving the economic feasibility of thermal production. Based on the principle of this technology, indoor thermal production test, numerical simulation research and pilot offshore experiment were conducted for the southern zone of Nanpu 35-2 oil field. It was indicated that remarkable results were achieved in adoption of thermal stimulation technology for offshore multiple thermal fluids. The average single-well daily production was increased to 50-60 cubic meters from 10-20 cubic meters when cold production process was used. The effective period lasted 300-400 days. The multiple thermal fluid generator and systematic injection equipment are under good operation in field application. Surface technique process satisfied the requirements for offshore thermal production.

Key words: offshoreoilfield, multiplethermal fluids, production, technology, research, practice