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低渗透油藏存在应力敏感现象,对17块低渗透岩心参照行业标准进行了应力敏感性实验,并对实验结果分别采用达西渗流规律公式和幂律渗流规律公式进行处理。由8块岩心实验数据获得流量与压力梯度的关系,回归得出幂律渗流规律公式中的参数。2种处理方法的实验结果表明:净围压越大,渗透率降低幅度越小;利用2种渗流规律处理方法得到的渗透率降低幅度相差不大;幂律渗流规律方法处理得到的渗透率为达西渗流规律方法处理的3.9倍;对于低渗透岩心实验数据,应该采用幂律渗流规律来处理。
The stress sensitivity phenomenon exists in low permeability reservoirs. The stress sensitivity experiments of 17 low permeability cores with reference to industry standards were carried out. The experimental results were respectively treated by Darcy percolation formula and power law percolation formula. The relationship between the flow rate and the pressure gradient is obtained from the experimental data of eight cores, and the parameters in the law of power-law percolation formula are obtained by regression. The experimental results of two kinds of treatment methods show that the larger the net confining pressure is, the smaller the decrease of permeability is; the less the permeability decreases with the two kinds of percolation rules; the permeability obtained by the power law percolation method is Darcy flow law of 3.9 times; for low-permeability core experimental data, the law should be used to deal with power law.