李彦阅,刘义刚,卢祥国,刘进祥,张楠
LI Yanyue,LIU Yigang,LU Xiangguo,LIU Jinxiang,ZHANG Nan

• 1:中海石油(中国)有限公司天津分公司
• 2:东北石油大学提高油气采收率教育部重点实验室

摘要(Abstract)：

LD5-2油田具有储层厚度大、平均渗透率高、非均质性强和原油黏度高等特点,长期注水开发加剧了储层非均质性。为了遏制水驱开发无效循环、提高油田开发效果,以渤海LD5-2油田为例,通过室内大尺寸岩心模型,开展了"调剖+调驱+驱油"措施组合与井网类型适应性实验研究。结果表明:与直井井网相比较,水平井井网注入井渗滤面积较大,注入压力较低,调剖剂难以进入中、低渗透层,措施后中、低渗透层吸液压差增幅较大,后续微球和高效驱油剂吸入量较多,扩大波及体积和提高洗油效率效果较好,采收率增幅较大;与水平井布置在中渗透层井网相比较,水平井贯穿高、中、低渗透层井网时,调剖剂可以更多进入中、高渗透条带,发挥宏观液流转向作用,促使后续调驱剂和高效驱油剂转向进入低渗透层,发挥深部调剖和原油降黏作用,采收率增幅较大。由此可见,"调剖+调驱+驱油"措施组合可以形成协同效应,进而可以取得更好增油降水效果。
Oilfield LD5-2 is characterized by large reservoir thickness, high average permeability, strong heterogeneity and high crude oil viscosity. The long-term water flooding has aggravated the reservoir heterogeneity. In order to curb the ineffective cycle of the waterflooding development and enhance the oilfield development effect, taking Bohai LD5-2 Oilfield as an example, the experimental research was carried out on the technical combination of profile modification, profile control and oil displacement as well as the well-pattern type adaptation by means of the indoor large-size core model. The study results show that compared with the vertical well network, there is a larger percolation area for the injecting well in horizontal well pattern, and the injection pressure is rather lower, so it is difficult for the profile-control agent to enter the middle and low permeability layers; after the stimulation, the imbibition pressure differences in the middle and low permeability layers increase greatly, and the subsequent microsphere and high-efficiency oil-displacing agent are inhaled more. The effects of expanding the swept volume and enhancing the oil washed efficiency are pretty better, so the oil recovery rate increases greatly. Compared with the well pattern of horizontal well arranged in the medium permeability layers, when the horizontal well penetrates the well pattern of high, medium and low permeability layers, more profile-control agent and modifier would enter the medium-high permeability strips with the macro-fluid diverting effect, allowing the subsequent profile-control and high-efficiency oil-dispersing agents into the low-permeability layer to exert the deep profile control and viscosity-reducing effects, which increases the recovery incremental rate.Therefore, the combination of profile modification, profile control and oil displacement has the synergistic effect to obtain much better oil increase and water decrease effects.

关键词(KeyWords)： 渤海稠油油藏;水平/垂直井网;宏/微观液流转向;乳化降黏;协同效应;物理模拟
Bohai heavy-oil reservoir;horizontal/vertical well pattern;macro/micro fluid-diverting;emulsification and viscosity reduction;synergistic effect;physical simulation

Abstract:

Keywords:

基金项目(Foundation): 国家“十三五”重大科技专项子课题“渤海双高油田多级窜逸堵调驱一体化技术研究及示范”(2016ZX05009003-010-001);; 中海石油(中国)有限公司天津分公司重点攻关课题“在线深部稠油流度改善与剖面调整技术研究”(CCL2018TJTSWST0635)、强化水驱调驱技术研究与应用(CCL2018TJTZDST0435)

作者(Author): 李彦阅,刘义刚,卢祥国,刘进祥,张楠
LI Yanyue,LIU Yigang,LU Xiangguo,LIU Jinxiang,ZHANG Nan

DOI: 10.19597/j.issn.1000-3754.202001019

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