Study and Application of Temperature-responsive Blockage Removal Agent in Oilfield
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摘要: 采用高温灼烧法和X射线衍射仪对堵塞物成分进行了分析测试，针对堵塞物特征采用聚乙二醇、氨基磺酸和十二酰氯作为反应单体，制备了温度响应型油田解堵剂（MSA），并对MSA解堵剂的综合性能进行了评价。结果表明：堵塞物以方解石（CaCO3）为主；解堵剂在20 ℃下pH值为6.05，在60 ℃下pH值为0.99，表明解堵剂在60 ℃下可以分解出大量的氨基磺酸，从而溶蚀堵塞物达到解堵目的。在60 ℃下作用30 min后，解堵剂对4种堵塞物的解堵率均可以达到82%以上，且在90 ℃时解堵剂中各成分活性依然较高，拥有较好的解堵能力和与地层水的配伍性。现场应用结果表明，试验井投产满6个月后，累计增油66.9 t。Abstract: A pore throat blockage sample was tested and analyzed for its composition with high temperature calcination method and X-ray diffraction method. Based on the results of the test and analysis, a temperature-responsive reservoir blockage removing agent MSA is developed with polyethylene glycol, sulfamic acid and lauroyl chloride. The general performance of MSA was evaluated by laboratory experiment. The reservoir blockage used in the experiment is mainly composed of calcite (CaCO3). MSA has a pH of 6.05 at 20 °C and 0.99 at 60 °C, this means that MSA decomposes at 60 °C and produces a large amount of sulfamic acid with which the blockage can be dissolved. More than 82% of the blockage can be dissolved after 30 min of interaction between the blockage and MSA, and at 90 °C, each component of MSA still retains high activity, meaning that MSA has good blockage removing capacity and compatibility with the formation waters. Field application of MSA showed that a production well treated with MSA had oil production increased by 66.9 t in 6 months.
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Key words:
- Temperature response type /
- Calcium carbonate /
- Blockage remover
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表 1 堵塞物样品中有机组分和无机组分含量
堵塞物 灼烧前/g 灼烧后/g 有机组分/% 无机组分/% B1 1.12 0.95 15.18 84.82 B2 1.28 1.01 21.09 78.91 B3 1.02 0.88 13.73 86.27 B4 1.03 0.92 10.68 89.32 
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表 3 MSA解堵剂的缓蚀性能评价
T/℃ m1/g m2/g ∆m/g 腐蚀速率/(g/(m2·h)) 20 1.2669 1.2666 0.0003 0.0625 30 1.2675 1.2672 0.0003 0.0625 40 1.2689 1.2685 0.0004 0.0833 50 1.2673 1.1109 0.1564 32.5872 60 1.2695 0.8495 0.4200 87.5000
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