二氧化碳注入对低渗透储层矿物及孔隙结构的影响研究
DOI:
作者:
作者单位:

1.中石化河南油田分公司石油工程技术研究院;2.中石化河南油田分公司新疆采油厂;3.中国石油大学华东石油工程学院

作者简介:

通讯作者:

中图分类号:

基金项目:


Effect of carbon dioxide injection on mineral and pore structure of low permeability reservoirs
Author:
Affiliation:

Research Institute of Petroleum Engineering and Technology

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    注二氧化碳采油过程中,二氧化碳溶解于水形成碳酸,与储层矿物反应会改变岩石矿物组成和储层物性。本文通过室内实验,研究了二氧化碳驱、二氧化碳/水交替驱及二氧化碳吞吐三种不同注入方式下对低渗透储层的矿物、产出流体、储层微观结构以及渗透率的变化。结果表明:二氧化碳驱、二氧化碳水气交替驱、二氧化碳吞吐三种注入方式均可使岩石渗透率增加,二氧化碳/水交替驱过程对岩心渗透率的影响最为明显;产出液中的钙离子和钠离子浓度都明显上升,岩心矿物中方解石及长石含量下降,碳酸的溶蚀作用导致岩心中的斜长石和方解石减少;在碳酸作用下岩石微观结构由致密、连通性差、粒间孔隙发育差状态,变为疏松,连通性好,粒间孔隙发育充分状态,溶蚀现象明显。

    Abstract:

    In the process of oilrecovery with carbon dioxide injection, carbonic acid is formedwhen carbon dioxide dissolves in water, which reacts with reservoir minerals and the mineral composition of rock and physical properties of reservoirare changed. In this paper, the changes of minerals, producing fluids, microstructure and permeability of low permeability reservoir under three different injection methods of CO2 flooding, alternate CO2/waterflooding and CO2 huff-n-puff were studied by laboratory experiments.The results show that the permeability of rocks can be increased by these three CO2injection methods. Among them, alternate CO2/waterfloodinghas the most obvious effect on the permeability;The concentration of calcium and sodium ions of the producing fluids increased obviously and the dissolution of carbonic acid results in the reduction of plagioclase and calcite in the core so that the content of calcite and feldspar in the core mineral decreased;The originalmicrostructureof rocks is dense, with poor connectivity and poor development of intergranular pores. After the effect of carbonic acid, the microstructure of rocks becomes loose, with good connectivity,well-developed intergranular pores and obvious dissolution.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2020-08-19
  • 最后修改日期:2020-09-28
  • 录用日期:2020-10-13
  • 在线发布日期:
  • 出版日期:
点击这里给我发消息

点击这里给我发消息