摘要
致密砂岩储层经过水力压裂施工后,支撑剂通常会嵌入裂缝壁面导致有效缝宽减小,进而导致裂缝导流能力的降低,影响压裂施工的效果。以鄂尔多斯盆地某致密砂岩油藏储层段岩样为研究对象,评价了不同类型支撑剂、支撑剂粒径以及铺砂浓度条件下支撑剂嵌入对裂缝缝宽和导流能力的影响,结果表明:在相同的试验条件下,石英砂在致密砂岩板上的嵌入对缝宽和裂缝导流能力的影响要大于陶粒;支撑剂粒径和铺砂浓度越小,有效缝宽越小,支撑剂嵌入导致裂缝导流能力的下降幅度越大。在致密砂岩储层压裂施工过程中,应根据现场实际情况优化压裂施工设计,选择合适的压裂施工参数,尽可能地降低支撑剂嵌入对裂缝导流能力的影响。
After hydraulic fracturing in tight sandstone reservoirs,proppant usually embeds in the fracture wall,resulting in the decrease of effective fracture width,which leads to the decrease of fracture conductivity and affects the effect of fracturing operation.Taking the rock sample of a tight sandstone reservoir in Ordos Basin as the research object,the effects of proppant embedment on fracture width and conductivity under the conditions of different types of proppant,proppant particle size and proppant concentration are evaluated.The results show that under the same conditions,the influence of quartz sand on fracture width and fracture conductivity is greater than that of ceramsite.The smaller the particle size and proppant concentration,the smaller the effective fracture width,and the greater the decrease of fracture conductivity caused by proppant embedment.During the fracturing operation of tight sandstone reservoirs,the fracturing construction design should be optimized according to the actual situation,and appropriate fracturing construction parameters should be selected to reduce the impact of proppant embedment on fracture conductivity as much as possible.
作者
沈渭滨
赵之晗
SHEN Weibin;ZHAO Zhihan(Zichang Oil Production Plant of Yanchang Oilfield Co.,Ltd.,Yan’an 716000,China;Hebei Xiong’an Huayou Clean Energy Co.,Ltd.,Renqiu 062552,China)
出处
《能源化工》
CAS
2022年第1期48-51,共4页
Energy Chemical Industry
基金
“十三五”国家科技重大专项“致密油储层高效体积改造技术”(2016ZX05046)。
关键词
致密砂岩
水力压裂
支撑剂嵌入
缝宽
裂缝导流能力
tight sandstone
hydraulic fracturing
proppant embedment
fracture width
fracture conductivity
