摘要
室内采用API裂缝导流能力测试仪对鄂尔多斯盆地某致密砂岩储层进行支撑裂缝导流能力影响因素评价实验。结果表明,单一粒径陶粒支撑剂在高闭合压力下裂缝导流能力明显下降,而将3种粒径陶粒支撑剂按1∶1∶1进行混合后,在高闭合压力下仍能保持较高的导流能力。支撑剂强度越高、铺砂浓度越大,裂缝导流能力越高。现场压裂液对裂缝导流能力影响较大,当闭合压力为75 MPa时,使用现场压裂液作为实验流体的裂缝导流能力比使用3%KCl溶液时下降60%以上。在纤维A加量小于0.04%时,随着纤维A加量的增大,裂缝导流能力逐渐降低;当纤维A加量大于0.04%时,裂缝导流能力逐渐升高,当纤维A加量为0.06%时,裂缝导流能力最高,再继续增大纤维A加量,裂缝导流能力逐渐下降。因此,在致密砂岩储层水力加砂压裂施工中,选择合适的压裂液和纤维等添加剂,以确保裂缝具有较高的导流能力。
Using API fracture conductivity tester indoor,we evaluated the influential factors of the conductivity of supporting fractures in tight sandstone reservoir from Ordos Basin.The results show that the fracture conductivity of ceramsite proppant with single particle size decreases significantly under high closure pressure,while ceramsite proppants with three particle sizes can maintain high conductivity under high closure pressure after mixing at 1∶1∶1.The higher the strength of proppant is and the higher the sanding concentration is,the higher the conductivity of fracture will be.Field fracturing fluid has a great influence on fracture conductivity,meanwhile,the adoption of field fracturing fluid as experimental fluid will decrease the fracture conductivity by more than 60%compared with adoption of 3%KCl solution under the closure pressure of 75 MPa.When the fiber A dosage is less than 0.04%,with the increase of fiber A dosage,the fracture conductivity decreases gradually.When the fiber A dosage is more than 0.04%,with the increase of fiber A dosage,the fracture conductivity increases gradually.When the fiber A dosage is 0.06%,the fracture conductivity reaches the highest,and further increase in the fiber A dosage will gradually decrease the fracture conductivity.It is suggested that appropriate additives such as fracturing fluids and fibers should be selected in the hydraulic sand fracturing construction of tight sandstone reservoirs to ensure high fracture conductivity.
作者
陈立群
朱宝坤
于兆坤
肖文凤
CHEN Liqun;ZHU Baokun;YU Zhaokun;XIAO Wenfeng(CNOOC Ener Tech-Drilling&Production Co.,Tianjin 300450,China)
出处
《化学与生物工程》
CAS
2019年第9期53-56,共4页
Chemistry & Bioengineering
关键词
致密砂岩储层
裂缝导流能力
压裂液
纤维
影响因素
tight sandstone reservoir
fracture conductivity
fracturing fluid
fiber
influential factor
