油气藏评价与开发 ›› 2018, Vol. 8 ›› Issue (4): 17-21.

• 油气藏评价 • 上一篇    下一篇

特高含水期油藏采油速度研究及影响因素分析

陈军1,杨峻懿2,刘启国2   

  1. 1. 西南石油大学研究生院,四川 成都 610500
    2. 西南石油大学石油与天然气工程学院,四川 成都 610500
  • 收稿日期:2017-06-26 发布日期:2018-11-28 出版日期:2018-08-26
  • 作者简介:陈军(1968—),男,教授,硕士生导师。油气藏工程理论与方法、油气藏工程计算等方向的科研和教学。
  • 基金资助:
    国家科技重大专项“特低渗—致密油藏不稳定试井分析技术研究”(2017ZX05009004-004)

Study on the speed of oil recovery and influence factors in extra-high water content period

Chen Jun1,Yang Junyi2,Liu Qiguo2   

  1. 1.Graduate School, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    2. Institute of petroleum and natural gas engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2017-06-26 Online:2018-11-28 Published:2018-08-26

摘要:

采油速度对于特高含水期水驱油藏开发效果具有十分重要的影响。在特高含水期,含水饱和度进一步升高,油藏在长期的注入水驱替、冲刷、冲蚀作用下,沿注采主流线上,在较大压力梯度的长期作用下,储层胶结疏松的微小颗粒会逐步剥落并随油流、水流一起向油井运移,在井筒近井地带重塑储层孔隙结构,导致储层微观孔隙结构发生深刻变化,严重时甚至会形成次生优势大通道,从而引起油水渗流特性突变,因此出现油水相渗比值曲线非线性的特征。基于这一特征,利用含水率分流方程,建立了采油速度与油藏特征、含水率、含水饱和度及含水上升速度等影响因素的关系表达式,由此揭示采油速度与上述各因素之间的内在联系,并分析各因素对采油速度的影响。通过与前人的方法对比,表明新方法应用于特高含水期油藏具有明显的优势。

关键词: 特高含水期, 采油速度, 含水率, 含水上升速度, 相渗曲线

Abstract:

The oil recovery rate has great impact on the development effects of the water drive reservoir in the period of extra-high water cut. During this period, the water saturation is further increased. The reservoir is subjected to the flooding, scour and erosion of the long-term water injection. Along the main line of the injection and mining, and under the long-term effect of the large pressure gradient, the loose particles of the reservoir will gradually peel off and move with the oil and water flow to the well. The pore structure of the reservoir is well remodeled in the wellbore near the well area. All these lead to the profound change of the microscopic pore structure of the reservoir. What's more serious is that a secondary dominant channel will form, which causes the abrupt change of the characteristics of the oil and water seepage. So there arises a non-linear characteristic of the oil-water infiltration ratio curve. Based on this feature, we established the relation between the oil recovery rate, and the reservoir characteristics, water cut, water saturation and the water cut increasing rate by using the water diversion equation to show the inner links between the oil recovery rate and the factors above. We also analyzed the influence of the various factors on the oil recovery rate. Compared with the previous methods, this new method has obvious advantages in the application of the reservoirs with the high water cut.

Key words: extra-high water cut period, production oil rate, water cut, increasing rate of water cut, relative permeability curve

中图分类号: 

  • TE341