Abstract: A comparative experimental study on the fracture conductivity between the self propping agent and the “propping agent + carrier fluid” has been carried out, and the mechanism analysis has been carried out. The results show that whether the self supporting proppant or the “propping agent + carrier fluid”, the fracture conductivity decreases with the increasing of closing pressure. With the increase of sand concentration, the conductivity of fracture increases. Compared with those of quartz sand, the compressive strength and the fracture conductivity of ceramsite are obviously higher. On the one hand, the polymer carrying liquids can enhance the compressive strength of proppant, reduce the crushing rate, and further increase the conductivity of fracture. On the other hand, the retention of carrier fluid among proppant particles will result in decrease in permeability, which will reduce the conductivity of fractures. Therefore, the fracture conductivity is the result of the interaction of permeability and fracture rate. Compared with that of the “proppant + carrier fluid”, the breaking rate of the self propping proppant is slightly higher, which has no obvious effect on fracture conductivity. It can be seen that the process of the self suspension proppant has no effect on the proppant compressive strength and the fracture diversion.

Key words: Self propping agent, Fracture conductivity, Crushing rate, Influencing factors, Mechanism analysis

摘要： 开展了自悬浮支撑剂与“支撑剂+携带液”裂缝导流能力对比实验研究，并进行了机理分析。结果表明，无论是自悬浮支撑剂还是“支撑剂+携带液”，随闭合压力增加，裂缝导流能力均减小。随填砂浓度增加，裂缝导流能力均增加。与石英砂相比较，陶粒抗压和裂缝导流能力明显较高。聚合物类携带液一方面可以增强支撑剂抗压能力，降低破碎率，进而增加裂缝导流能力。另一方面，携带液在支撑剂颗粒间隙中会发生滞留，致使渗透率减小，这会降低裂缝导流能力。因此，最终裂缝导流能力是渗透率和破碎率共同作用的结果。与“支撑剂+携带液”相比较，自悬浮支撑剂破碎率略高，对裂缝导流能力未造成明显影响。由此可见，自悬浮支撑剂加工过程中并未对支撑剂抗压能力和裂缝导流能力造成影响。

关键词: 自悬浮支撑剂, 裂缝导流能力, 破碎率, 影响因素, 机理分析