The Effect of Geometrical Morphology of Rigid Lost Circulation Material on Its Retention Behavior in Fractures
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摘要: 为了更合理地选择堵漏材料、设计高性能堵漏浆配方，研究了不同几何形态堵漏材料在裂缝中的滞留行为。采用理论分析和室内试验相结合的方法，考虑堵漏材料粒级、几何形状和裂缝面粗糙度等因素，设计并进行了粗糙缝面裂缝内固相滞留试验，考察了堵漏材料的几何形态对其在裂缝中滞留行为的影响。试验发现：粒级对球状和片状堵漏材料在裂缝中的滞留行为均有影响，但对球状堵漏材料滞留行为的影响更显著；相同粒级条件下，片状堵漏材料在裂缝中的滞留概率高于球状堵漏材料。研究结果表明：球状堵漏材料的优点是封堵迅速、封堵效率高，但其封堵质量受粒级影响显著，对缝宽变化适应性较差；片状堵漏材料的优点是对缝宽变化适应性强、滞留概率高；将球状与片状堵漏材料复配，可有效提高其滞留概率，又好又快地封堵裂缝。Abstract: In order to select the lost circulation material more reasonably and to design the high performance plugging slurry formulations,the retention behavior of different lost circulation material of various geometrical morphologies in the fractures was studied.Researchers combined theoretical analysis with laboratory tests,and took into consideratoin the influence of grain size grade of lost circulation material,geometrical morphology and fracture surface roughness.They then designed and carried out solid phase retention tests in the rough face fractures to investigate the effect of geometric shape of plugging material on its retention behavior(and embedment)in fractures was investigated.It was found that the grain size grade had an effect on the retention behavior of both spherical material and flaky material in fractures. In fact,the effect on the retention behavior of spherical material was more significant.Specifically,when the material was of the same grain size grade,the retention probability of the flaky material in the fractures was higher than that of the spherical material.The results showed that the spherical material had advantages,including its rapid plugging and high plugging efficiency.However,its plugging quality was seriously affected by grain size grade,and the adaptability to the variation of slot width was poor,while the advantages of flaky material were its strong adaptability to slot width variation and high retention probability.The combination of spherical lost circulation material and flaky lost circulation material could effectively improve the retention and embedment probability and achieve better fracture plugging.
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