低渗透油藏应力敏感实验数据处理方法对比

摘要

Stress sensitivity presents in low-permeability reservoirs. Choose 17 blocks low-permeability cores to stress sensitivity experiment according to SY/T 5358-2010 standard. The Darcy law equation and power-law non-linear percolation equation are adopted to analyze the experimental data. The parameter of power-law non-linear percolation equation is regressed from the relations between rate and stress gradient derived from other 8 blocks experimental cores. The results show that the peripheral pressure numbers are greater and the permeability number reduces less. Also, the conclusion can be achieved that the reduced ratio of permeability number from the two correlated calculated methods is nearly same. But, the permeability number based on power-law percolation method is quadruple to Darcy law method. So, the power-law non-linear percolation equation suggests to be used to data analysis in low-permeability reservoir.%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.