Construction and Evaluation of a New Completion Fluid for Heavy Oil Reservoir in LD Oil Field
LD A oil field is a typical heavy super heavy oil reservoir with shallow burial,thick oil and large reserves,and thermal production is an effective way to develop it.There are great differences between heavy oil reservoirs and conventional reservoirs in reservoir physical properties,fluid properties and production technology,and the existing conventional water-based completion fluid system cannot meet the needs.In this paper,according to the heavy oil thermal production process,the reservoir characteristics of heavy oil reservoir,the new requirements of preventing emulsification and thickening of heavy oil and reducing viscosity to promote drainage were fully considered,and a new completion fluid system was constructed.A new organic amine completion fluid system suitable for heavy oil was established through the evaluation of inhibition,viscosity reduction,drainage aid,compatibility and reservoir protection effect under high temperature environment of thermal recovery.This system not only improved the reservoir protection effect of heavy oil thermal recovery well development,but also reduced the comprehensive cost of completion fluid,which provided a strong guarantee for improving the quality and efficiency of heavy oil development in Bohai oilfield.
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