应用核磁共振测量技术测量稠油-水相对渗透率曲线
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西南石油大学

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黏度可控的原位增黏体系构建及高效驱油机理研究 基金编号:U19B2010


Measurement of relative permeability curve of heavy oil - water by nuclear magnetic resonance
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Southwest Petroleum University

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    摘要:

    相对渗透率是稠油开发实验中一个重要的基本测量参数,由于稠油黏度较高,水驱过程易发生油水乳化现象,使得稠油-水相渗曲线较难准确获取。传统的相渗曲线测量方法将岩心看作一个“黑匣子”,对出口端的油、水体积采用人工读数或者称重的方法,存在测量精确度低、获得信息少等缺点。为准确测量稠油-水相渗曲线,本文选取人造砂岩长岩心,基于低场核磁共振测量技术,通过对渤海B油藏稠油和地层水同时标定,采用非稳态法进行稠油-水相渗曲线的测量,对岩心以及出口端的采出液进行T2谱测试,从而较为准确地获取了岩心的孔隙体积(147.18cm3)、束缚水饱和度(25.9%)、残余油饱和度(43.83%)以及出口端的油、水含量,并得到较为精确地稠油-水相渗曲线,而且对发生油水乳化的采出液进行了D/T2二维谱测试,较为准确地判断出油水是否发生了乳化。研究结果可以为稠油水驱开发提供一定的理论指导,有利于稠油水驱开采机理的研究。

    Abstract:

    Relative permeability was an important basic measurement parameter in heavy oil development experiment. Due to the high viscosity of heavy oil, oil-water emulsification was prone to occur during water flooding process, which made it difficult to obtain the heavy oil-water relative permeability curve accurately. The traditional measurement method of relative permeability curve regarded the core as a "black box", and measured the volume of oil and water at the outlet by the method of manual reading or weighing, which had the disadvantages of low measurement accuracy and less information. In order to accurately measure the heavy oil-water relative permeability curve, this paper selected the long artificial sandstone core. Based on the nuclear magnetic resonance measurement technology, through the simultaneous calibration of crude oil and formation water of Bohai B reservoir, the unsteady state method was used to measure the heavy oil-water relative permeability curve, and the T2 spectrum test was carried out on the core and the produced fluid at the outlet. Thus, the pore volume (147.18cm3), irreducible water saturation (25.9%), residual oil saturation (43.83%) of the core and the oil and water content at the outlet were obtained more accurately, and the heavy oil-water relative permeability curve was obtained more accurately. Moreover, the D/T2 two-dimensional spectrum test was carried out on the produced fluid with oil-water emulsification, and the emulsification of oil and water was judged more accurately. The research results can provide some theoretical guidance for the development of heavy oil water flooding, which is beneficial to the study of the mechanism of heavy oil water flooding.

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  • 收稿日期: 2021-12-13
  • 最后修改日期: 2022-02-15
  • 录用日期: 2022-02-23
  • 在线发布日期: 2022-08-29
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