海上油田在线组合调驱提高采收率技术——以渤海C油田E井组为例

发布时间：2018-01-10 02:08

本文关键词：海上油田在线组合调驱提高采收率技术——以渤海C油田E井组为例　出处：《科学技术与工程》2017年09期 　论文类型：期刊论文

【摘要】：针对渤海C油田E井组层间非均质性严重、层内非均质性强的问题,结合海上油田空间有限、快速开发等特点,提出以在线交联体系作为调剖段塞、在线非均相体系作为调驱段塞的在线组合调驱思路。利用不同渗透率双管填砂模型,考察了乳液聚合物与交联剂浓度分别为1 500 mg/L、1 650 mg/L和3 000 mg/L、3 300 mg/L的两种交联体系的调剖能力,结果表明,注入0.5 PV的交联体系并侯凝5 d后,低浓度对应的双管模型上,低渗砂管的分流量由0%变为40%;高浓度对应的双管模型上,高、低渗砂管的分流量相对于前期水驱阶段发生逆转,低渗砂管的分流量由0%变为84%,有效抑制了水驱"优势通道",调整了层间吸水矛盾。利用均质岩心物理模型,在乳液聚合物、微球聚合物和预交联凝胶颗粒总浓度保持4 000 mg/L的条件下,考察了水驱后不同非均相体系驱油效果;并与乳液聚合物单独使用时的实验结果进行了对比。结果表明,不同配方的非均相调驱体系均大幅提高了采收率,提高采收率幅度随着预交联颗粒在体系中所占浓度的提高而增大。2016年3月5日,在线组合调驱体系在C油田E23井开始注入。先后注入3 440.8 m~3的交联体系和10 997 m~3的非均相体系。根据生产情况分析,调驱开始后E24、E27、E36、E28H1、E18、E22取得显著降水增油效果,截至2016年8月初,通过净增油法计算,已经实现累积增油5 937.1 m~3。
[Abstract]:Aiming at the serious heterogeneity between layers and strong heterogeneity in E well group in Bohai C oilfield, combined with the characteristics of limited space and rapid development of offshore oil fields, the on-line cross-linking system is proposed as a slug for profile control. The on-line heterogeneous phase system is used as the on-line combined control and flooding idea for the slug. The concentration of emulsion polymer and crosslinking agent is 1 500 mg/L by using the dual tube sand filling model with different permeability. The profile control ability of two crosslinking systems of 1 650 mg/L and 3 000 mg / L 3 300 mg/L is obtained. After the crosslinking system was injected with 0.5 PV for 5 days, the flow rate of the low permeability sand pipe changed from 0% to 40 on the two-tube model corresponding to the low concentration. In the dual pipe model with high concentration and low permeability, the split flow of high and low permeability sand pipes is reversed compared with the earlier stage of water flooding, and the flow rate of low permeability sand pipe is changed from 0% to 84, which effectively inhibits the "dominant channel" of water drive. Based on the homogeneous core physical model, the total concentration of emulsion polymer, microsphere polymer and pre-crosslinked gel particles were kept at 4 000 mg/L. The oil displacement effect of different heterogeneous systems after water flooding was investigated. The results are compared with the experimental results when the emulsion polymer is used alone. The results show that the oil recovery is greatly improved by the heterogeneous modulation flooding system with different formulations. The range of oil recovery increased with the increase of the concentration of premixed particles in the system. March 5th 2016. The on-line combined flooding system began to be injected into well E23 in C Oilfield. The crosslinking system of 344.0.8 mm3 and the heterogeneous system of 10997 mm3 were injected successively. The production conditions were analyzed. After the start of the oil flooding, E24 / E27 / E36 / E28H1 / E18 / E22 obtained remarkable effect of precipitation and oil increase. Up to the beginning of 2016, it was calculated by the method of net oil increase. A cumulative increase of 5 937.1 mm3 has been realized.
【作者单位】：中海油能源发展工程技术分公司;中海油海洋石油高效开发国家重点实验室;
【基金】：中国海洋石油总公司科研项目(CNOOC-KJ 135 KJXM NFGJ 2016-04) 中海油能源发展股份有限公司工程技术分公司科研项目(GCJSXMHT-1617)资助
【分类号】：TE53
【正文快照】： 渤海C油田位于渤中25-1构造南界发育的大断层下降盘,为明下段断裂背斜构造,地层原油黏度为20~209 m Pa·s,温度在74.4~76.1℃之间,油藏北块以岩性油藏为主,南块以岩性-构造油藏为主。C油田新近系储层孔隙度变化范围为26.2%~31.7%,平均30.0%,属于高孔;渗透率分布范围为676~3 90

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