水力压裂用支撑剂破碎率的影响因素分析

Analysis of Influence Factor of the Proppants Crush Resistance in Hydraulic Fracturing

水力压裂是提高储层产能的有效措施,而其效果与支撑剂性能相关。破碎率是水力压裂用支撑剂性能评价的重要指标之一。遵循有关测试标准的规定,通过室内实验,分析了支撑剂铺置浓度、铺置方式、闭合应力加载速率、支撑剂湿度和粒径分布等因素对石英砂、陶粒类支撑剂破碎率测试值的影响。实验结果显示,这些因素对支撑剂破碎率测试值都有一定的影响,其中铺置浓度、铺置方式的影响较大;不同的实验室所得到的测试值也有差异;支撑剂破碎率与导流能力不是完全对应的关系。选择水力压裂作业用的支撑剂时不宜只看破碎率指标,应重视对支撑剂导流能力的测试评价。

Hydraulic fracturing is an effective measure to improve reservoir productivity,and its effect is related to proppant performance.Crushing rate is one of the important indexes for performance evaluation of proppant used in hydraulic fracturing.According to the relevant test standards,through experiments,the influence of proppant concentration,proppant laying mode,closed stress loading rate,proppant humidity and particle size distribution on the test value of crushing rate of sand and ceramic proppant is analyzed.The experimental results show that these factors have a certain influence on the test value of proppant crushing rate,and the paving concentration and paving method have a greater influence.The test values obtained by different laboratories are also different.The relationship between proppant crushing rate and conductivity is not completely corresponding.When selecting proppant for hydraulic fracturing operation,we should not only pay attention to the crushing rate index,but also pay attention to the test and evaluation of proppant conductivity.