Solution-gas drive in heavy oil reservoirs
Solution-gas drive in heavy oil reservoirs
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DOI：
10.2118/99-04-06
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发表时间：
1999-04-01
影响因子：
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通讯作者：
Firoozabadi, A
中科院分区：
文献类型：
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作者：
Pooladi-Darvish, M;Firoozabadi, A
人们提出了不同的假设来解释某些稠油油藏在溶解气驱条件下的非常有利的动态。然而，主要原因仍不清楚。本文通过疏松填砂实验，研究了稀油和稠油的溶解气驱过程。压力和体积测量以及在重油系统的原位压力下流动流体的视觉观察揭示临界气体饱和度低（5%或更低），气相不是由随油流流动的微泡组成，液体流动性在气泡成核或生长时没有改善，并且过饱和效应也不占主导地位。实验和数值模拟结果表明，稠油溶解气驱中气体流度远小于轻质油，提高了稠油的采收率。
Different hypotheses have been made to explain the highly favourable behaviour of some of the heavy oil reservoirs under solution-gas drive. The main reasons however remain unclear. Using experiments in an unconsolidated sandpack, we examined thee solution-gas drive process in a light oil and a heavy oil. Pressure and volume measurements and visual observation of the flowing fluid at the in situ pressure for the heavy oil system revealed that critical gas saturation was low (5% or less), the gas phase was not made of microbubbles flowing with the oil stream, liquid mobility did not improve upon nucleation or growth of the gas bubbles, and supersaturation effects were nor dominant. The experimental and simulation results indicate that gas mobility in solution-gas drive in heavy oil is much less than in light oil, leading to improved recovery performance of the former.