海上多层合采油藏乳状液调剖性能定量表征

Quantitative Characterization of Emulsion Profile-Control Performance in Offshore Multi-Layer Production Reservoir

针对海上油田多层合采时多孔介质中乳状液调剖性能定量表征的问题,建立了非均质实验模型,设计了不同渗透率组合、粒径匹配程度以及乳状液浓度的实验方案,基于物理模拟实验结果,引入了分流率和分流率改变系数的概念,定量表征乳状液调剖性能。结果表明:随着渗透率级差增大和乳状液浓度增加,调剖性能增强,粒径匹配因子为1时乳状液调剖性能最好;在渤海X油田实施了乳状液调剖方案,实际结果与预测结果接近,误差小于5%。研究认为,乳状液调剖性能定量表征是一个非常复杂的问题,与乳状液的特征及储层的地质特征紧密相关,同时与工艺也存在一定的相关性,建议开展全面研究,更加真实地反映乳状液的调剖性能,实现油藏的高效开发。海上多层合采油藏乳状液调剖性能定量表征对乳状液调剖方案设计具有一定的参考价值。

A heterogeneous experiment model is established to quantitatively characterize the emulsion profile-control performance in porous media during the muhi-layer production in offshore oilfiehh The experiments with different permeability combinations, particle combinations and emulsion concentrations are designed and conducted. Based on the laboratory experiment result, the fractional flow rate and its modifying coefficient arc introduced to quantitatively characterize the emulsion profile-control performance. Research indicates that thc emulsion profile- control performance enhances with the increase of permeability contrast and emulsion concentration. The optimum profile-eontrol performance is achieved when the particle matching factor reaches 1. Emulsion profile-control treat- ment is implemented in the Bohai X Oilfield and the prediction with an error of less than 5% is very close to that of aetual peff, rmance. It is also considered that the quantitative characterization of emulsion profite-control is a complex issue, which is dependent on emulsion properties, reservoir geology and process. A eomprehcnsive rescarch is suggested to more actually characterize the emulsion profile-control performance and realize efficient reservoir development. The quantitative characterization of emulsion profile-control performanee in offshore multi-layer production oil reservoir could provide certain reference for the emulsion prufile-contrul prngram design.