非常规油气压裂支撑剂圆度球度快速测定新方法

Study on a new method for rapid determination of roundness sphericity of unconventional oil and gas fracturing proppant

压裂支撑剂性能对储层水力压裂设计至关重要,其中圆度球度是性能参数的重要指标。对于同一种支撑剂而言,其圆度值和球度值越高,抗破碎能力也越强,支撑剂裂缝导流能力就越大。传统的圆度球度测定主要通过人工目测的传统经验方法实现,主观性较强且效率相对较低。基于光学显微镜成像结合计算机图像技术,提出了一种压裂支撑剂圆度球度的快速测定的新方法,即角点曲率半径均值拟合的圆度算法和多元线性回归拟合的球度算法。检测结果表明,测定方法在Krumbein-Sloss图版上的检测结果与标准模板结果接近,最大误差仅为3.1%;与传统人工目测法的结果进行对比分析,检测结果最大误差仅6%,满足标准要求,同时可以实现大批量的压裂支撑剂圆度球度的快速自动检测,大大降低了实验成本,为现场压裂设计支撑剂性能优选以及降本增效提供技术参考。

The performance of fracturing proppant is very important for reservoir hydraulic fracturing design,and roundness and sphericity is an important index of performance parameters.For the same proppant,the higher roundness value and sphericity value,the stronger the anti-breaking ability,and the greater fracture conductivity of the proppant.The traditional roundness and sphericity measurement is mainly realized by the traditional empirical method of manual visual inspection,which is subjective and relatively inefficient.Based on optical microscope imaging combined with computer image technology,a new method for rapid determination of roundness sphericity of fracturing proppant is proposed,that is,the roundness algorithm of mean curvature radius fitting of corner points and the sphericity algorithm of multiple linear regression fitting.The detection results show that the detection results on the Krumbein-Sloss plate are close to the standard template results,and the maximum error is only 3.1%.Compared with the results of the traditional manual visual method,the maximum error of the test results is only 6%,which meets the standard requirements.At the same time,it also can realize the rapid automatic detection of the roundness and sphericity of a large number of fracturing proppants,which greatly reduces the experimental cost and provides technical reference for the optimization of proppant performance and cost reduction and efficiency increase in field fracturing design.