Nylon cord rubber has the advantages of small residual deformation and is easy to lift and lower the tubing string in low-permeability oil and gas reservoirs. However, it is associated with low-pressure resistance and poor sealing performance. To enhance the performance of nylon cord rubber, a three-dimensional numerical model of the nylon cord rubber was established and its accuracy experimentally determined. The Plackett–Burman test, the Steepest climbing test and the Response surface method were used to acquire the polynomial response surface model connecting structural parameters with bearing and sealing pressure. Using genetic algorithms, optimal structural parameters of nylon cord rubber were determined depending on field operation. The reliability of the optimized results was verified by laboratory tests. It was shown that after optimization, the bearing capacity of the expandable packer increased by 25% while the sealing performance increased by 66%. In addition, the bearing pressure was 70 MPa while the sealing pressure was 50 MPa. These measurements effectively met the on-site requirements of high-pressure and fine fracturing in low-permeability oil and gas reservoirs.

尼龙帘线橡胶的残余变形小，易于在低渗油气藏中提起和放下管柱。但是，这与耐低压性和密封性能差有关。为了提高尼龙帘线橡胶的性能，建立了尼龙帘线橡胶的三维数值模型，并通过实验确定了其准确性。使用Plackett–Burman检验，最陡峭的爬升试验和响应面方法来获得将结构参数与轴承和密封压力联系起来的多项式响应面模型。使用遗传算法，根据现场操作确定了尼龙帘线橡胶的最佳结构参数。通过实验室测试验证了优化结果的可靠性。结果表明，优化后，可膨胀封隔器的承载能力提高了25％，而密封性能则提高了66％。另外，轴承压力为70MPa，而密封压力为50MPa。这些测量有效地满足了低渗透油气藏中高压和精细压裂的现场要求。