针对非均质CO₂气驱油藏存在的气窜问题，研制出一种以聚丙烯酰胺为基液、M型无机交联剂（Cr³⁺无机类）和K型有机交联剂（酚醛树脂有机类）复合使用的SDC-1型防CO₂气窜体系。在温度为115℃、矿化度2×10⁴ mg/L的实验条件下，该体系具有良好的防止CO₂气窜效果。结果表明，有机-无机复合交联体系较传统单一交联剂体系具有更高的强度及热稳定性。该体系的弹性模量G'主要受M型无机交联剂加剂量影响，其微观结构具有无机交联凝胶体系的强树状结构及有机交联体系的球状结构，兼具2种体系优点。在3种不同渗透率人造岩心中，SDC-1型防CO₂气窜体系可以有效降低CO₂气窜，封堵率均在95%以上，突破压力梯度最高达12.3 MPa/m。

SDC-1 preventing CO₂ channeling system is developed with polyacrylamide as basic solution cross-linked by a metal cross-linker M and an organic cross-linker K to solve the problem of gas channeling in heterogeneous CO₂ flooding reservoirs.This system exhibits a good effect in preventing CO₂ from channeling at a salinity of 2×10⁴ mg·L^-1 and 115℃,and its thermal stability and gel strength are superior to those using a single cross-linker.The storage modulus of the system is mainly affected by the dosage of M-type cross-linker.Its microstructure has a strong dendritic structure of inorganic crosslinking gel system and spherical structure of organic crosslinking system.Among three kinds of artificial cores with different permeability,SDC-1 system can reduce CO₂ channeling effectively,with a blocking rate exceeding 95% and a breakthrough pressure as high as 12.3 MPa·m^-1.

何龙(1980-),男,博士,高级工程师,研究方向为油田化学,paladinglong@163.com