高速通道压裂支撑裂缝导流能力实验评价

Experimental evaluation on influencing factors of flow conductivity for channel fracturing proppant

支撑裂缝导流能力是评价压裂施工效果的重要参数,通过室内导流能力实验,研究支撑剂粒径和段塞数、纤维浓度及其加入方式对高速通道压裂支撑裂缝导流能力的影响,并采用正交试验和灰色关联分析法分析各参数对支撑裂缝导流能力的影响程度。结果表明:支撑剂粒径越大,支撑裂缝的导流能力越强;支撑剂段塞数越多,通过增加支撑剂段塞数得到的支撑裂缝导流能力增幅越小;当闭合压力小于41 MPa时,支撑剂段塞数越多,支撑裂缝导流能力随着闭合压力的增大降幅越大;支撑裂缝导流能力随纤维浓度的增加而降低,以纤维包裹支撑剂这种纤维加入方式对支撑裂缝导流能力的影响最大;各参数对支撑裂缝导流能力影响程度由大到小依次为闭合压力、支撑剂段塞数、纤维浓度、纤维加入方式、支撑剂粒径。

Flow conductivity of the proppant fracture system is one of the important parameters of evaluating the effect of fracturing. The effect of the numbers of the proppant diameter,proppant slug,the concentration and existing ways of fiber was studied in laboratory through the experiment of flow conductivity. The importance of parameters on the flow conductivity was analyzed based on orthogonal experimental design and grey relational analysis. The results show that:flow conductivity increases with the proppant diameter;the larger the number of the proppant slug,the less the increasing range of the flow conductivity;when the closure pressure is less than 41 MPa,the more the proppant slugs,the greater magnitude the flow conductivity changing with the closure pressure;the flow conductivity will decrease with the increasing of the fiber concentration,and fiber wrap proppant has the largest impact on the proppant conductivity;parameters that affect flow conductivity are listed in a descending order:closure pressure,the number of proppant slug,the fiber concentration,the exiting way of fiber in the fracture,the diameter of the proppant.