新型支化改性纤维素醚驱替性能研究

Study on Displacement Properties of Novel Beanched Modified Cellulose Ether Displacing Agents

摘要: 在实验室对支化改性纤维素醚(MCEL)驱油剂和未支化改性纤维素醚(CEL)聚合物驱油剂的驱替性能和采收率进行了对比研究发现，在聚合物溶液浓度为0.6 g/L到1.3 g/L的范围内，对渗透率为100 × 10⁻³μm²左右的填砂管进行驱替，发现随着聚合物浓度的增加，MCEL和CEL驱替的RF和RRF值均增大，采收率提高幅度也均增加，MCEL驱采收率最大值为11.06%远高于CEL驱采收率最大值9.14%。MCEL和CEL适用的渗透率范围可低达23.06 × 10⁻³μm²，在渗透率高达287.7 × 10⁻³μm²时也均有较好的驱替效果。同时，在整个渗透测试范围内MCEL驱提高采收率的幅度均大于对应条件下CEL驱提高采收率的幅度。1.3 g/L MCEL在渗透率为63.39 × 10⁻³μm²时采收率提高幅度最大(11.41%)，远高于CEL驱提高采收率幅度的最高值9.52%，新型支化改性纤维素醚对于扩大波及面积，提高采收率具有重要作用。

Abstract: In the laboratory, the displacement performance and oil recovery of branched modified cellulose ether (MCEL) and unbranched modified cellulose ether (CEL) polymer oil displacement agents are compared. It is found that the permeability is 100 × 10⁻³μm² in the range of polymer solution concentration from 0.6 g/L to 1.3 g/L. It was found that with the increase of polymer concentration, the RF and RRF values of MCEL and CEL flooding increased, and the recovery efficiency increased. The maximum recovery efficiency of MCEL flooding was 11.06%, which was much higher than that of CEL flooding (9.14%). The permeability range of MCEL and CEL can be as low as 23.06 × 10⁻³μm², and they have good displacement effect when the permeability is as high as 287.7 × 10⁻³μm². At the same time, in the whole range of permeability test, the EOR of MCEL flooding is greater than that of CEL flooding under corresponding conditions. When the permeability of 1.3 g/L MCEL is 63.39 × 10⁻³μm², the increase of recovery efficiency is the largest (11.41%), which is much higher than the maximum value of 9.52% of that of CEL flooding. The new branched modified cellulose ether plays an important role in expanding the swept area and enhancing oil recovery.