Optimization of a High Temperature Low Corrosivity Acid Fluid for Application at 180℃ High Temperature
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摘要: 针对高温深井酸化施工井下温度高、井下管柱和工具腐蚀严重的恶劣工况,笔者通过分子结构设计和合成,研发了抗180℃高温的新型高温缓蚀剂,并在此基础上优选其他助剂构建了2套抗180℃高温低腐蚀酸液体系。实验结果表明:①该缓蚀剂在180℃下,N80钢片在常规酸腐蚀速度为70 g/m2·h,具有良好的缓蚀性能;②体系无沉淀,不分层,具有良好的配伍性能和较高的抗滤失性;③在180℃下,N80钢片在0.4%和0.8%胶凝酸体系的平均腐蚀速率分别为87.3g/m2·h、95.8 g/m2·h。现场应用表明,抗180℃高温低腐蚀酸液体系满足高温深井酸压施工井下管柱和工具安全要求,施工结束后出井油管内壁光滑,酸压前后酸液性能表现良好,井下安全正常。Abstract: A new high temperature corrosion inhibitor has been developed though molecular structure design and synthesis to deal with problems encountered in high temperature deep well acidification, such as high bottom hole temperature and corrosion of downhole string and downhole tools. The corrosion inhibitor, which can be used at 180℃, was used with other optimized additives to formulate 2 sets of low corrosivity acid fluids for operation at 180℃. Laboratory experimental results showed that:1) the corrosion rate N80 steel in the presence of the corrosion inhibitor at 180℃ was 70 g/m2·h, indicating that the corrosion inhibitor developed has very good corrosion inhibiting capacity. 2) precipitation and stratification were not observed in the acid fluids formulated with the corrosion inhibitor, meaning that the additives used to formulate the acid fluids have good compatibility and filtration control capacity. 3) at 180℃, the average corrosion rates of N80 steel plate in 0.4% and 0.8% gel acids were 87.3 g/(m2·h) and 95.8 g/(m2·h), respectively. In high temperature deep well acid fracturing operation, the high temperature low corrosivity acid fluids had almost no negative effect on downhole strings and downhole tools; tubing strings pulled out of hole after operation had smooth inner walls. The acid fluids had good properties before and after acid fracturing operation, and the well was in safe conditions throughout the operation.
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Key words:
- High temperature /
- Low corrosivity /
- Acid fluid /
- formulation optimization /
- Application
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