水驱油藏水平井控水工艺技术研究

Advances in Geo-Energy Research, 2018, 2(2): 210-217

原文网址：http://www.astp-agr.com/index.php/Index/Index/detail?id=65

  水平井开发边底水油藏过程中，水平段局部边底水的突进，会使油井含水迅速上升，导致大量剩余油无法采出，影响油田的采收率。如何确定水平井出水位置，并采取合理有效的控水工艺技术，对于水平井的高效开发具有重要意义。本文针对海上油田底水油藏中的水平井，提出了采用中心管控水的工艺技术。通过在水平段插入中心管，改善井筒流入剖面，减小高含水段的产液贡献率，达到控水目的。                              

  本文详细阐述了基于油藏渗流理论以及能量守恒原理等，建立油层中的渗流与水平井筒内的流动耦合的数学模型的过程。通过推导得到了考虑井筒流动影响的水平井产液剖面，根据不同井段的产液贡献预测了底水突破位置。以此为基础，重点讨论了在水平段插入中心管后井筒流入剖面的变化，研究了插入中心管对水平井生产的影响。通过对比研究插入不同长度及类型的中心管的控水效果，针对目标井优化了中心管的长度，形成了一套水平井中心管控水工艺技术方案。现场应用结果表明，插入中心管后该井含水率下降了3%-8%，有效改善了油井的生产效果。目前，该项技术工艺在渤海油田应用超过了5井次，取得了较好的控水效果。

Research of water control technology for horizontal wells in water-driven reservoirs

Baobing Shang, Xiaodong Han, Shuai Li, Kouqi Liu

(Published: 2018-04-29)

CorrespondingAuthor and Email: Baobing Shang, shangbb@cnooc.com.cn

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Citation: Shang, B., Han, X., Li, S., Liu, K. Research of water control technology for horizontal wells in water-driven reservoirs. Advances in Geo-Energy Research, 2018, 2(2): 210-217, doi: 10.26804/ager.2018.02.08.

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ArticleType: Original article

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Abstract：

     Horizontal wells are widely applied in the Bohai offshore oil fields due to their large oil drainage areas and high yields. However, water coning is a significant problem existing in water-driven reservoirs. To control water coning, this paper introduces a stinger completion method which can be applied in the horizontal wells. Based on the principle of mirror reflection and mass conservation law, a mathematical model coupling fluid flow both in the reservoir and in the horizontal wellbore has been developed. Using the new proposed model, the well production profile and bottom hole flowing pressure distribution along the horizontal well, considering the influence of flowing in the wellbore, are calculated successfully. Moreover, the influence of the stinger completion on the inflow profile is investigated. According to the results of the sensitivity analysis, a 160 m’ 2-7/8 tubing is designed to be built in the horizontal section. The field-test results show that the stinger completion could be used to improve the wellbore inflow profile and decrease the possibility of water-cut thus increasing the effective enhanced oil recovery (EOR).

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Keywords: Horizontal well, bottom water reservoir, stinger completion, water control, mathematical model.

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