西南石油大学学报(自然科学版)

• 石油与天然气工程 • 上一篇    下一篇

浅层稠油油藏CO2 吞吐控水增油机理研究

孙雷,庞辉,孙扬,侯大力,潘毅   

  1. “油气藏地质及开发工程”国家重点实验室·西南石油大学,四川成都610500
  • 出版日期:2014-12-01 发布日期:2014-12-01
  • 基金资助:

    国家科技重大专项(2011ZX05016–005)

Mechanism Study on Water Control and Enhanced Oil Recovery by CO2
Huff-puff for Shallow Heavy Oil Reservoir

Sun Lei, Pang Hui, Sun Yang, Hou Dali, Pan Yi   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
  • Online:2014-12-01 Published:2014-12-01

摘要:

针对低稠油油藏和稠油油藏注水开发中后期含水上升快、原油采收率的低等问题,开展了CO2 吞吐控水增油
的室内物理模拟实验和单井CO2 吞吐控水增油的数值模拟。为了研究CO2 吞吐控水增油的机理及可行性,在室内分
别开展了CO2 与地层原油/地层水配伍性实验和CO2 吞吐控水增油长岩芯实验。CO2 与地层原油/地层水配伍性实验
结果表明:CO2 对原油有增容膨胀和降黏作用;一定温度下,随着压力的降低,饱和CO2 的地层水的体积膨胀,CO2 在
地层水中的溶解度降低,CO2 吞吐过程中,地层水遇到狭小孔隙受阻,产生贾敏效应,控制水的产出。长岩芯实验也表
明,CO2 吞吐有明显的控水增油的作用。单井CO2 吞吐控水增油的数值模拟结果同样证实了CO2 吞吐具有良好的控
水增油显著。

关键词: 浅层稠油油藏, CO2 吞吐, 控水增油, 提高采收率, 数值模拟

Abstract:

To solve the problems of rapidly increase water cut and low oil recovery in the later water-flooding of low heavy
oil and heavy oil reservoirs,we conducted laboratory physical simulation experiments and single well numerical simulation of
CO2 huff and puff in water control and oil enhancement. To find out the mechanism and feasibility,CO2 and reservoir oil/water
compatibility experiment and long core experiment of CO2 huff and puff are carried out respectively. The former has shown that
CO2 has capacity expansion and viscosity reduction effects on the heavy oil. At a certain temperature,as the pressure decreases,
the volume of reservoir water saturated with CO2 expands and the solubility of CO2 in reservoir water declines which indicates
that in CO2 huff and puff,water is trapped by the small core thus causing Jamine Effect,and preventing the water from being
produced. The long core experiment has also shown that CO2 huff and puff has a significant effect on controlling the water and
enhancing the oil recovery. This has also been demonstrated by single well numerical simulation of CO2 huff and puff.

Key words: shallow heavy oil reservoir, CO2 huff and puff, water control and oil increase, EOR, numerical simulation