Research and Practice on Stimulation Mechanism of Multi Thermal Fluid Huff and Puff in Offshore Heavy Oil Fields
The multi-component thermal fluid is a high temperature and high pressure mixture of steam,nitrogen and carbon dioxide,which can reduce the viscosity of heavy oil,increase formation pressure,improve reservoir profile and improve the development effect of heavy oil reservoir.Multicomponent hot fluid huff and puff technology is widely used in the efficient development of heavy oil offshore.With the increase of huff and puff rounds,the mechanism of multicomponent hot fluid huff and puff is not known,and the recovery effect is reduced.In order to effectively improve the production efficiency of heavy oil fields,reservoir simulation analysis and multicomponent hot fluid huff and puff and displacement laboratory test methods were adopted to explore the contribution of different multicomponent hot fluid components to stimulation,further clarify the mechanism of multicomponent hot fluid huff and puff,and provide theoretical guidance and effective measures for the optimization design of multicomponent hot fluid thermal recovery program and post-huff and puff development adjustment.The test results showed that through the demonstration application of multi-component heat flux thermal production in offshore oil fields,the daily oil production of the oil field has increased from 218 m3·d-1 before thermal production to the highest 641 m3·d-1,an increase of 195%,and the thermal production effect was obvious.
Heavy oil thermal recoveryMultiple thermal fluid huff and puffIndoor experimentMechanism of increasing production
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