Synthesis and Evaluation of Epoxy Resin Self-Degradation Plugging Agent for Fractured Formation
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摘要: 针对裂缝性储层承压封堵与保护储层技术难题，基于环氧树脂材料自降解机理分析，研制了一种新型环氧树脂自降解堵漏剂，并探究了固化剂及改性剂加量对新型环氧树脂自降解堵漏剂性能的影响。借助承压强度实验、长裂缝封堵模拟实验装置、储层保护实验仪等，开展了抗压强度、裂缝封堵及储层保护性能测试。实验结果表明，新研制的环氧树脂自降解堵漏剂具有良好的降解性能，在不同温度下最终降解率均能达到90%以上，120 ℃下96 h降解率大于95%，且通过调整改性剂加量可实现降解速率可调，使其匹配施工时间窗口；同时自降解堵漏剂具有较高的弹性模量和良好的抗压破碎率，在30 MPa下抗压破碎率仅为6.2%，结合粒度级配优选，新型环氧树脂自降解堵漏剂可有效封堵0.5～4.0 mm之间的裂缝，具有较好的裂缝承压封堵效果，储层保护实验结果表明，自降解堵漏剂降解8 d后，岩心渗透率恢复率达99.1%，储层保护效果良好。Abstract: In view of the technical difficulties in plugging and protecting fractured reservoirs, based on the analysis of the self-degradation mechanism of epoxy resin materials, this paper developed a new type of epoxy resin self-degradation plugging agent, and experimentally explored the influence of the dosage of curing agent and modifier on the performance of the new type of epoxy resin self-degradation plugging agent. With the help of pressure bearing strength experiment, long fracture plugging simulation experiment device, reservoir protection tester, etc., the compressive strength, fracture plugging and reservoir protection performance were systematically tested. The experimental results show that the newly developed epoxy resin self-degradable plugging agent has good degradation performance. The final degradation rate can reach more than 90% at all temperatures, and the degradation rate is more than 95% at 120 ℃ for 96 h. The environmental temperature and pH can promote its degradation; At the same time, the self-degradable plugging agent has a high elastic modulus and a good compression crushing rate, and the compression crushing rate is only 6.2% under 30 MPa. Combined with the particle size grading optimization, the new epoxy resin self-degradable plugging agent can effectively block the cracks between 0.5-4 mm, and has a good crack pressure bearing sealing effect, the result of reservoir protection experiment shows that after 8 days of degradation of self-degradable plugging agent, the core permeability recovery rate reaches 99.1%, and the reservoir protection effect is good.
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表 1 不同堵漏材料的抗压破碎率及弹性模量
堵漏
材料抗压破碎率/% 弹性
模量15 MPa 30 MPa 石灰石 22.6 36.7 20.0～50.0 石英 14.2 27.6 30.0～65.0 核桃壳 0.3 1.6 10.0～15.0 橡胶 1.3 2.7 0.1～5.0 自降解材料 4.6 6.2 20.0 
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表 2 8%自降解堵漏剂实验浆对长裂缝封堵性能的影响
自降解堵
漏剂/%裂缝开度/
mm封堵突破压力/MPa 漏失量/
mL封堵有效区域位置/cm 8 1.0×0.5 12.0 9 封门 2.0×1.0 11.2 24 26～46 3.0×2.0 10.5 38 38～62 4.0×3.0 9.8 76 45～71
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