葛丽珍, 王公昌, 张瑞, 张烈, 张俊廷. 渤海S油田高含水期强水淹层避射原则研究[J]. 石油钻探技术, 2022, 50(3): 106-111. DOI: 10.11911/syztjs.2022013
引用本文: 葛丽珍, 王公昌, 张瑞, 张烈, 张俊廷. 渤海S油田高含水期强水淹层避射原则研究[J]. 石油钻探技术, 2022, 50(3): 106-111. DOI: 10.11911/syztjs.2022013
GE Lizhen, WANG Gongchang, ZHANG Rui, ZHANG Lie, ZHANG Junting. Research on the Perforation Avoidance Principle for Strong Water-Flooded Layers with High Water Cut in the S Oilfield of Bohai[J]. Petroleum Drilling Techniques, 2022, 50(3): 106-111. DOI: 10.11911/syztjs.2022013
Citation: GE Lizhen, WANG Gongchang, ZHANG Rui, ZHANG Lie, ZHANG Junting. Research on the Perforation Avoidance Principle for Strong Water-Flooded Layers with High Water Cut in the S Oilfield of Bohai[J]. Petroleum Drilling Techniques, 2022, 50(3): 106-111. DOI: 10.11911/syztjs.2022013

渤海S油田高含水期强水淹层避射原则研究

Research on the Perforation Avoidance Principle for Strong Water-Flooded Layers with High Water Cut in the S Oilfield of Bohai

  • 摘要: S油田经长期水驱开发,强水淹层段显著增加,传统水淹层划分方法及相应的射孔原则已无法满足当前阶段开发需求。为此,以室内物理模拟试验和测井解释结果为基础,利用渗流阻力系数和低效注入水定量评价方法,分析了因驱油效率差异引起的动态干扰界限:驱油效率大于30%时,含水差异引起的层间干扰较小;驱油效率为40%~45%时,低效、无效水循环加剧。根据驱油效率差异引起的动态干扰界限,提出了适用于S油田高含水期的水淹级别划分类型,在此基础上,制定了以驱油效率干扰界限为核心的射孔原则:高含水期油田水淹级别为Ⅰ级至Ⅴ级时,除工程因素外无需避射;当水淹级别为Ⅵ级时,需采取避射措施。S油田调整井应用根据该原则制定的射孔方案后,油井含水率平均下降8百分点,取得了较好的开发效果。研究结果表明,上述避射原则可以避开注入水无效循环的强水淹层,可以指导强水淹级别下储层射孔方案的制定。

     

    Abstract: After long-term development by water flooding, the highly water-flooded layer number has significantly increased in the S Oilfield. In this case, the traditional classification water-flooded layer method with the corresponding perforation principle can no longer meet the needs of current development. Therefore, the dynamic interference limit triggered by the difference in displacement efficiency was analyzed by utilizing the seepage resistance coefficient and the quantitative evaluation method of low-efficiency water injection. This work was conducted on the basis of the indoor physical model test and logging interpretation results. When the displacement efficiency was greater than 30%, the interlayer interference caused by the water cut difference was small, but when the displacement efficiency was 40%–45%, inefficient and ineffective water circulation was aggravated. Considering the above dynamic interference limit, a suitable classification type was proposed for the water flooded level in the high water cut period in the S Oilfield of Bohai. On this basis, a perforation principle was established with the interference limit of displacement efficiency as the core: In the high water cut period, there was no need to avoid perforation except for engineering factors when the water flooded level was from I to V. As the water flooded level reaches VI, perforation avoidance measures should be taken. After implemented the perforation scheme made according to the proposed perforation principle in the adjustment wells in the S Oilfield, the water cut was reduced by 8 percent points on average, which indicated good results.The research results demonstrate that the perforation avoidance principle above can avoid the strong water flooded layer with ineffective circulation of injected water, and can guide the formulation of the perforation scheme for reservoir with strong water flooded level.

     

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