柔性凝胶颗粒调剖剂的室内研究

THELABORATORY RESEARCH OF FLEXIBLE GEL PARTICLE PROFILE CONTROL AGENT

AM/AA/AMPS/钠基膨润土采用溶液聚合法合成柔性凝胶颗粒调剖剂,以吸水倍数和弹性模量为指标,对影响凝胶颗粒合成的各因素进行了室内研究。结果表明:交联剂、AM与AA的质量比、单体总量、黏土是影响聚合物弹性模量的主要因素,AM与AA的质量比、单体总量、中和度等决定着聚合物的吸水性能。柔性凝胶颗粒优化后的最优配方为:m(AM)∶m(AA)=2∶1,w(AMPS)=0.2%,w(黏土)=7.5%,w(交联剂)=0.04%,w(引发剂)=0.04%,中和度80%。该配方下,凝胶颗粒在95℃、160 000mg/L条件下可吸水17.12g/g,老化90d后,仍能吸水15.5g/g,在高温高盐环境下具有良好的稳定性。注入0.5PV的0.5%柔性凝胶颗粒+1 000mg/L聚丙烯酰胺溶液,岩心封堵率可达90%以上。经现场试验,试验井组平均日增油3.74t/d,平均降水11.7%,起到了良好的增油降水效果。

Flexible gel particle is synthesized by acrylamide,acrylic acid,sodium bentonite using solution polymerization.Water absorption capacity and elastic modulus are used to be indexes to research influence factors of FPG.The results indicate that cross linking agent,mass ratio of acrylamide and acrylic acid,monomer gross,clay are the major factor on elastic modulus of FPG and mass ratio of acrylamide and acrylic acid,monomer gross and neutralization play a decisive role on the water absorption capacity of FPG.The optimal reaction conditions are determined as follows：m（AM）∶m（AA）=2∶1,w（AMPS）=0.2%,w（clay）=7.5%,w（crosslinking agent）=0.04%,w（initiator）=0.04%,neutralization 80%.The water absorption capacity of FPG can reach 17.12g/g on above formula under 95 ℃and 160g/L mineralization.After 90days＇ standing on above condition,FPG water absorption is still 15.5g/g.That indicates FPG have a good stability on the condition of high temperature and high salinity.Core stemming ratio can reach over 90% after injecting the solution of 0.5%FPG and 1 000mg/L polyacrylamide.Through filed application,average daily oil production increases3.74t/d and average water cut decreases 11.7% on test well groups.It plays a good effect of increasing oil production and decreasing water cut.