西南石油大学学报(自然科学版) ›› 2016, Vol. 38 ›› Issue (5): 97-106.DOI: 10.11885/j.issn.16745086.2014.10.15.01

• 石油与天然气工程 • 上一篇    下一篇

基于流线积分法的注水井网非稳态产量模型

蒲军1,2,3, 刘传喜1, 尚根华1   

  1. 1. 中国石化石油勘探开发研究院, 北京 海淀 100083;
    2. 中国科学院渗流流体力学研究所, 河北 廊坊 065007;
    3. 中国科学院大学, 北京 石景山 100190
  • 收稿日期:2014-10-15 出版日期:2016-10-01 发布日期:2016-10-01
  • 通讯作者: 蒲军,E-mail:pujun830@sohu.com
  • 作者简介:蒲军,1982年生,男,汉族,四川南充人,工程师,硕士,主要从事低渗透及致密砂岩油藏开发方面的研究。E-mail:pujun830@sohu.com;刘传喜,1964年生,男,汉族,重庆铜梁人,教授级高级工程师,硕士,主要从事油气藏开发机理、生产动态分析、开发方案及战略规划等方面的研究。E-mail:lcx5189.syky@sinopec.com;尚根华,1964年生,男,汉族,河北行唐人,高级工程师,博士,主要从事提高采收率、核磁共振、油气藏模拟和缝洞油藏不确定性及优化等方面的研究。E-mail:shanggh.syky@sinopec.com

Non-steady Water-flooding Production Model of Areal Well Pattern Based on Flow Line Integral Method

PU Jun1,2,3, LIU Chuanxi1, SHANG Genhua1   

  1. 1. SINOPEC Petroleum Exploration and Production Research Institute, Haidian, Beijing 100083, China;
    2. Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, Hebei 065007, China;
    3. University of Chinese Academy of Sciences, Shijingshan, Beijing 100190, China
  • Received:2014-10-15 Online:2016-10-01 Published:2016-10-01

摘要: 低渗透油藏注水开发通常表现为油水两相非达西渗流,基于达西定律推导的计算方法不再适用。根据流线积分法基本原理,考虑启动压力梯度的影响,推导了单根流管中油水前缘突破前后的产量计算公式,然后引入面积井网注水开发过程中启动角的计算方法,最终通过建立数值积分可以得到不同井网形式下的非稳态产量计算模型。对比了模型计算结果与油田实际生产数据,证实了模型的可靠性,能够满足油田现场产量预测的要求。运用该模型计算并探讨了启动压力梯度、井网形式及生产压差对油井生产动态的影响,发现启动压力梯度对油井生产影响大,在开发指标预测过程中不能忽略;五点井网产量高、递减慢,在条件允许的情况下应该尽量采用五点井网;合理提高生产压差能够提高采油速度,缩短油田开发周期,开发效果好。

关键词: 低渗透油藏, 启动压力梯度, 非达西渗流, 流线积分法, 启动角

Abstract: The development of low-permeability reservoirs displays non-Darcy flow in the process of water-flooding, which makes the calculation methods based on Darcy's law not applicable. Based on the flow line integral method and considering the threshold pressure gradient,the production calculation formulas of the flow tube before and after water break- through were derived, then the calculation method of startup angle in the water-flooding development of areal well pattern was introduced, and finally the non-steady water-flooding production model of low-permeability reservoirs was established through numerical integration. This model could be used to predict the production of oil wells, and the reliability of the model was approved by comparison between calculation and realproduction. Applying the model to a certain block,we analyzed the effect of threshold pressure gradient,areal well pattern and production pressure drop in oil production. The results show that the threshold pressure gradient had great influence on the production of oil well,so it could not be ignored when predicting the development index;the production of five-spot well pattern was larger than others while its decrease was slow,so the five-spot well pattern is suggested in the oilfield; and the increase in production pressure drop could enhance the rate of production and shorten the development cycle of oilfields.

Key words: low-permeability reservoir, threshold pressure gradient, non-Darcy flow, flow line integral method, startup angle

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