引用本文:曾德智,同航,易勇刚,刘从平,孙宜成,石善志. 二氧化碳驱采油井缓蚀阻垢剂的复配实验研究[J]. 石油与天然气化工, 2018, 47(6): 68-73.
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二氧化碳驱采油井缓蚀阻垢剂的复配实验研究
曾德智1,同航1,易勇刚2,刘从平2,孙宜成2,石善志2
1.“油气藏地质及开发工程”国家重点实验室·西南石油大学;2.中国石油新疆油田分公司工程技术研究院
摘要:
针对西部某油田注CO2驱腐蚀结垢的特点,选用油田普遍使用的咪唑啉、季铵盐、酰胺盐、膦酸盐缓蚀剂以及氨基三亚甲基膦酸和聚天冬氨酸阻垢剂进行复配实验研究,用电化学测试方法和静态阻垢测试实验优选出性能良好的缓蚀剂和阻垢剂单剂,对所选的缓蚀剂和阻垢剂在总质量浓度240 mg/L下进行最优配比实验后,采用失重法、模拟工况测试阻垢率以及扫描电镜(SEM)评价复合缓蚀阻垢剂的防护效果。实验结果表明:通过单剂筛选得出的缓蚀剂和阻垢剂在60 ℃饱和CO2模拟地层水中对N80碳钢的缓蚀率高达94.13%,阻垢率高达93.98%;在总质量浓度为240 mg/L时,缓蚀剂与阻垢剂按2∶1的质量比复配后的试剂,缓蚀率达91.98%,阻垢率达91.10%;在模拟实际最苛刻的生产工况下,复合缓蚀阻垢剂的防腐防垢均能满足油田控制指标。研究表明,膦酸盐和聚天冬氨酸复配的缓蚀阻垢剂可以抑制CO2驱采油井的腐蚀结垢问题。
关键词:  CO2  腐蚀结垢  采油井  缓蚀剂  阻垢剂  复合缓蚀阻垢剂
DOI:10.3969/j.issn.1007-3426.2018.06.014
分类号:
基金项目:国家自然科学基金“静载、振动与腐蚀作用下H2S/CO2气井完井管柱螺纹密封面的力化学损伤机制研究(51774249);国家科技重大专项“低渗透砂砾岩油藏CO2驱油机理及工程技术研究”(2016ZX05016004)
Compounding experimental study on corrosion and scale inhibitor of CO2 flooding well
Zeng Dezhi1, Tong Hang1, Yi Yonggang2, Liu Congping2, Sun Yicheng2, Shi Shanzhi2
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, China;2. Engineering and Technology Research Institute of Xinjiang Oilfield Company, CNPC, Karamay, Xinjiang, China
Abstract:
In view of the characteristics of corrosion and scaling of CO2 flooding in an oilfield in the western part of the country, imidazoline, quaternary ammonium salt, amide salt, phosphonate inhibitors and amino trimethylene phosphonic acid, poly-aspartic acid scale inhibitors used in oil field were chosen, then the compounding experimental studies were proceeded. The electrochemical test method and the static scale inhibition test experiment were used to select the good corrosion inhibitor and single agent for the scale inhibitor. The compounding agent was used for the optimal concentration test at the total concentration of 240 mg/L. The protective effect of the composite corrosion and scale inhibitor was evaluated by weight loss method, the scale ratio of the simulated condition, and the scanning electron microscope (SEM). The experimental results showed that:the corrosion inhibition rate of corrosion inhibitor and scale inhibitor obtained by single-agent screening in saturated CO2 simulated formation water at 60 °C was as high as 94.13% for the N80 carbon steel, and the scale inhibition rate was as high as 93.98%. When the inhibitor and scale inhibitor were compounded in a ratio of 2∶1, the total concentration was 240 mg/L, the corrosion inhibition rate was 91.98%, and the scale inhibition rate was 91.1%. In the simulation of the most demanding production condition, the effect of anti-corrosion and anti-scaling of the composite corrosion and scale inhibitor could meet the oil field control indicators. Studies showed that the combination of phosphonate and poly-aspartic acid corrosion and scale inhibitor could inhibit the corrosion and scaling of CO2 flooding wells.
Key words:  CO2 corrosion and scale  production well  corrosion inhibitor  scale inhibitor  composite scale inhibitor and corrosion inhibitor