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目前使用的调驱用弱凝胶抗盐性差。分析了常用或推荐的改善弱凝胶调驱体系抗盐性的措施 ,包括清水预冲洗地层 ,使用钙镁离子络合剂 ,使用有机交联剂 ,使用粘土胶液和无机凝胶 ,认为均不能令人满意。合成了RSP系列抗盐聚合物 (类梳状聚合物 ) ,用中等分子量 ( 9.5× 1 0 6 )、低水解度 ( 1 0 % )的一种抗盐聚合物RSP3和有机铬交联剂CL 2配制了弱凝胶 ,并与几种常用HPAM进行了比较 ,结果如下。用模拟长庆油田高矿化度、高钙镁含量地层水 ( 2 .3 %NaCl+ 1 .7%CaCl2 溶液 )配制的 0 .3 %RSP3溶液的粘度 ,在 3 0℃下为 3 7.5mPa·s,65℃下为 2 3 .0mPa·s,在 65℃下放置 2 4小时后为 2 0 .5mPa·s,均较相同条件下 4种HPAM同浓度溶液粘度高约 1倍。用该模拟地层水配制的 0 .2 5%RSP3 /CL 2凝胶属于中等变形不流动凝胶 ,在 51℃、60℃放置 60天以上不析水、不破解 ,而 3种HPAM的 0 .3 %凝胶在热老化过程中或发生析水 ,或破解 ,或强度下降。用人工海水 ( 3 %NaCl+ 0 .3 %CaCl2 溶液 )配制的RSP3溶液 (和弱凝胶 )性能更好。
The current use of weak gel with poor resistance to salt. The commonly used or recommended measures to improve salt resistance of weak gel conditioning system were analyzed, including pre-rinsing with water, using calcium-magnesium ion complexing agent, using organic cross-linking agent, using clay glue and inorganic gel, Not satisfactory. The RSP series salt-resistant polymer (comb-like polymer) was synthesized and synthesized with a salt-resistant polymer RSP3 of medium molecular weight (9.5 × 10 6) and low degree of hydrolysis 2 Weak gel was prepared and compared with several commonly used HPAM, the results are as follows. The viscosity of the solution of 0.3% RSP3 formulated in high salinity and high calcium and magnesium formations (2.3% NaCl + 1.7% CaCl2 solution) simulating the Changqing oilfield has a viscosity of 3 7.5 mPa · s, which is 2.3mPa · s at 65 ° C and 20.5mPa · s after 24 hours at 65 ° C, all of which are about twice as high as those of the four HPAM solutions under the same conditions. The 0.25% RSP3 / CL 2 gel formulated with this simulated formation water belongs to the medium deformation non-flowing gel. When it is stored at 51 ° C and 60 ° C for more than 60 days, no water is cracked or cracked. 3% gel in the heat aging process or the occurrence of water, or cracked, or decreased strength. RSP3 solution (and weak gel) formulated with artificial seawater (3% NaCl + 0.3% CaCl2 solution) performed better.