应用核磁共振测量技术测量稠油-水相对渗透率曲线

Measurement of Relative Permeability Curve of Heavy Oil and Water by Nuclear Magnetic Resonance

蒲万芬 常家靖 邹滨阳 刘锐 杜代军 赵帅

PUWanfen CHANG Jiajing ZOU Binyang LIU Rui DU Daijun ZHAO Shuai

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，选取人造砂岩长岩心，并基于低场核磁共振测量技术，通过同时标定渤海B油藏的 稠油和地层水，采用非稳态法进行稠油-水相渗曲线的测量。结果表明，通过对岩心以及出口端的采出液进行T2 谱测试，较为准确地获取了岩心的孔隙体积（147.18 cm3）、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，并得到较为精确的稠油-水相渗曲线。通过对发生油水乳化的采出液进行自扩散系数（D）/T2 二维谱测试，可较为准确地判断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。

Relative permeability is an important basic measurement parameter in heavy oil development experiment. Due to the high viscosity of heavy oil，oil-water emulsification is easy to occur during water flooding，which makes it difficult to obtain the heavy oil-water relative permeability curve accurately. The traditional measurement method of relative permeability curve has the disadvantages of low measurement accuracy and less information. In order to accurately measure the heavy oil-water relative permeability curve，the artificial sandstone long core was selected，the heavy oil and formation water of Bohai B reservoir were calibrated at the same time based on low field nuclear magnetic resonance measurement technology. The unsteady state method was used to measure the heavy oil-water relative permeability curve. The results showed that the pore volume（147.18 cm3），bound water saturation（25.9%），residual oil saturation（43.83%）and oil and water content at the outlet of core were accurately obtained by T2 spectrum test of the produced liquid in the core and at the outlet，meanwhile the heavy oil-water relative permeability curve was obtained more accurately. Through the D/T2 two-dimensional spectrum test of the produced liquid with oil-water emulsification， it could be more accurate to judge whether the oil-water emulsification occurred. The research results could provide some theoretical guidance for the heavy oil development by water flooding，which was beneficial to the exploitation mechanism study of heavy oil by water flooding.

10.19346/j.cnki.1000-4092.2022.04.025