摘要
为了掌握射孔孔道造成的黏度损失,试验研究了射孔注聚过程中聚合物黏度变化规律。利用4种聚能射孔弹在一致性较好的贝雷砂岩靶上射孔、注聚、测试。1200×10^(4)分子量、 800mg/L质量浓度的聚合物以3PV注入时黏损基本稳定;4种聚能射孔弹造成的黏损为20.8%~27.4%,随着装药量/孔容的增加注入聚合物的黏损逐渐降低;聚合物流速低于5mL/s通过10mm射孔孔眼时黏度无变化,随着流速的增加黏损逐渐增大,10mL/s时黏损超过3%。聚合物低流速通过套管上的孔眼时不产生黏损,聚能射孔弹产生的射孔孔道大小和损害程度决定黏损程度。聚能射孔对注聚影响研究成果有助于了解射孔孔道注聚产生的黏损,为射孔、注聚方案优化设计提供参考。
In order to understand the viscosity loss caused by perforated channels,the law of polymer viscosity change during perforating by polymer flooding was studied.Four kinds of shaped charge perforation shells were used to perforation,polymer injection and test on Berea sandstone target with good consistency.The viscosity loss of the polymer with a molecular weight of 1200×10^(4) and a mass concentration of 800 mg/L was basically stable when the polymer was injected of 3PV.The viscosity loss caused by four kinds of shaped charge perforation shells was between 20.8%and 27.4%,and the viscosity loss decreased gradually with the increase of charge amount or pore volume.When the flow rate of polymer was below 5 mL/s,the viscosity of polymer through 10 mm perforated hole did not change,and the viscosity loss increased gradually with the increase of flow rate,and the viscosity loss could exceed 3%when the flow rate was 10 mL/s.There was no viscosity loss when the polymer passed through the hole in the casing at low velocity,and the size of the hole and the damage degree of the shaped charge perforation shells could determine the amount of viscosity loss.The research results of the effect of shaped charge perforation on polymer injection are helpful to understand the viscosity loss in the perforated channels by polymer flooding,which provides a reference for the optimization design of perforation and polymer injection scheme.
作者
李东传
陈奕君
邹雪岩
Li Dongchuan;Chen Yijun;Zou Xueyan(Production Technology Institute of Daqing Oilfield Limited Company)
出处
《采油工程》
2022年第4期58-61,86-87,共6页
Oil Production Engineering
关键词
聚能射孔
砂岩
注聚
黏损
试验
shaped charge perforation
sandstone
polymer flooding
viscosity loss
test
