摘要
考察了不同聚合物和交联剂的水基弱凝胶作为调驱剂在胜利油田平均地层条件下 (温度 70℃ ,地层水矿化度72 77mg L)的适用性。实验研究结果表明 :HPAM(-M =1.7× 10 7) 柠檬酸铝体系成胶快且凝胶稳定性很差 ,粘度保持时间不到 4 8h ;疏水缔合聚合物NAPs 柠檬酸铝体系凝胶稳定性有所改善但所需聚合物浓度太高 (>12 0 0mg L) ;NAPs 有机铬体系在聚合物浓度 6 0 0～ 80 0mg L时 ,可在 1～ 3d内形成粘度 30 0～ 5 0 0mPa·s且能稳定存在 >4 5d的弱凝胶 ;在NAPs 有机铬体系 (70 0mg L +5 0mg L)中加入 5 0～ 2 5 0mg L有机酸 ,成胶时间从 1～ 3d延长至 7～ 15d以上 ,可以满足矿场应用中大剂量注入的需要。图 1表 5参 2。
The applicability of weak gels of 2 different polymers and crosslinkers is investigated as permeability profile modifying/flooding agent in standard reservoir conditions of Shengli (temperature 70℃ and TSD of formation water 7 277 mg/L). It is shown that HPAM/Al citrate/artificial formation water (AFW) systems ( AM-U2 =1.7×10 7 for HPAM) gelate very fast and the gel viscosity is not stable and maintains <48 hrs; hydrophobically associating polymer NAPs/Al citrate/AFW systems form gels with improved stability at rather high polymer concentration, >1 200 mg/L; NAPs/Cr 3+ (from an organic acid salt)/AFW systems containing 600-800 mg/L of polymer form gels of viscosity 300-500 mPa·s in 1-3 days which keeps stable in more than 45 days (the experimental time duration limit); by introducing 50-250 mg/L of a selected organic acid as gelation retarder into system of 700 mg/L of NAPs+500 mg/L of Cr 3+ crosslinker+AFW the gelation time of the system is delayed from 1-3 days to 5-15 day and more. This delayed gelling NAPs/Cr 3+ fluid can meet the requirements to a permeability profield modifying/flooding fluid in field uses where the amount of the fluid to be injected is large.
出处
《油田化学》
CAS
CSCD
北大核心
2002年第4期355-357,共3页
Oilfield Chemistry
