关键词: 多元热流体, 吞吐开发, 热采效果评价, 非常规稠油, 海上油田

Abstract:

Oilfield A is the first pilot test spot of thermal recovery in offshore unconventional heavy oil field. The development
effect will directly affect the future development of offshore unconventional heavy oil resources. Based on production performance
of thermal recovery well in Oilfield A，the influence of edge water on the development effect of thermal recovery wells
was analyzed，and we proposed distance from thermal recovery well to edge water to be more than 200～300 m. A comparison
between normal and thermal production of the same well，and between the production of thermal recovery well and adjacent
normal production well in the same layer showed that early productivity and the first annual oil production of thermal recovery
wells are both 1.5 to 2.0 times as normal production wells. Integrated evaluation method was performed using bottom hole
temperature and productivity index data，and we analyzed the valid period of thermal recovery well，which is between 240 to
339 days，298 days on average. The values of cycle average capacity，oil production and oil-steam ratio were compared to the
pre-drilling design value，and the results showed that without considering sand control technology，drill string problems and
reservoir property change，thermal recovery wells have reached the expected results of the first cycle，with the average capacity
of 5 m3/d，cycle oil production of 1.80×104 m3；and the incremental oil production of 0.7×104 m3. The thermal recovery effect
of multi-thermal fluid stimulation is obvious，and will guide the development of other offshore unconventional heavy oil field.

Key words: multi-thermal fluid, huff and puff development, thermal recovery effect evaluation, unconventional heavy oil,
offshore oilfield