Study on the Performance and Mechanism of the Acid-Oxidation Dual-Target Blocking Removing System
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摘要: 注水井“有机-无机复合堵塞”（油藏聚合物残留/生物膜+碳酸钙垢交织）是导致延长油田某注水作业区压力攀升、采收率下降的原因。本研究突破传统单一解堵思路，提出“酸氧化协同双靶向解堵技术”，通过构建氨基磺酸（无机靶向）—过硫酸盐（有机靶向）-糖苷表面活性剂（渗透靶向）三元协同体系，实现“破垢-降解-疏通”全链条解堵。研究表明：氨基磺酸（8%）和盐酸（2%）靶向溶解碳酸钙垢，溶蚀率达到85.96%，同步缓蚀（腐蚀速率<0.076 mm/a）；过硫酸铵（3%）热激活释放自由基（SO4−·/·OH），精准降解聚合物及生物膜；烷基糖苷（APG-12）降低界面张力，驱动解堵剂深入微孔喉。现场应用显示，解堵后注水压力下降至1.5 MPa，有效期突破200 d。该技术为注水井堵塞长效治理提供了“机理-技术-应用”一体化解决方案。Abstract: “Organic-inorganic composite blocking” (interweaving of reservoir polymer residue/biofilm and calcium carbonate scale) is the cause of pressure increase and rate of recovery decline in a water injection block in Yanchang oilfield. In this study, instead of focusing on blocking removal with a single method, a “synergy of acid oxidation with dual-targeting blocking removal technology” is presented. By constructing a ternary synergistic system of sulfamic acid (inorganic targeting)-persulphate (organic targeting)-glycoside surfactant (permeation targeting), full blocking removal by “scale breaking-degradation-unclogging” is realized. Studies show that targeting dissolution of calcium carbonate scale can be realized with sulfamic acid (8%) and hydrochloric acid (2%), the rate of dissolution reaches 85.96% and corrosion inhibition can be realized simultaneously (the rate of corrosion < 0.076 mm/a). Ammonium persulphate, after heat activated, releases radicals (SO4−·/·OH) which precisely degrade polymers and biofilms. Alkyl polyglycoside (APG-12) can reduce surface tension and push the blocking removal agents to go deep into the micro pore throats. Field application has shown that after removing the blockages from the micro pores, the water injection pressure was reduced by 1.5 MPa and time for the blocking removing measures to remain effective exceeded 200 d. This technology provides an integrated solution, which is “mechanism-technology-application”, to the long-term effective treatment of injection well blocking problem.
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Key words:
- Composite blocking /
- Synergy of acid oxidation /
- Dual-targeting /
- Blocking removing
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表 1 解堵剂不同注入阶段溶蚀与腐蚀情况
注入阶段 溶蚀率/% 平均腐蚀率/mm·a−1 阶段Ⅰ 82.07 0.052 阶段Ⅱ 85.44 0.052 阶段Ⅲ 85.96 0.047 
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表 3 溶蚀前后元素重量百分比
元素 重量百分比/% 溶蚀前 溶蚀后 Fe 73.92 82.21 Ca 23.86 14.58 Si 1.14 3.21 Ba 1.08 0.00 Sr 0.00 0.00 Mg 0.00 0.00
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