Development and Plugging Mechanism of High Strength Epoxy Resin-Based Plugging Agent Used in Offshore Oil and Gas Wells with Sustained Annular Pressure
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摘要: 海上油气井的环空压力积聚问题在高温高压下尤为突出，易引发泄漏、腐蚀及井筒结构失效，严重威胁作业安全与井筒完整性。针对传统水泥和树脂类封堵材料在流动性、固化可控性及力学性能方面存在的局限性，研制了一种适用于不动管柱条件下施工的新型高强度环氧基封堵剂。该材料由35%～55%环氧树脂、5%超支化树脂、20%～30%稀释剂和10%～40%中温固化剂复配而成。基于室内实验评估了新型高强度环氧基封堵剂的流变学行为、力学性能、热稳定性和密封能力。结果表明，该封堵剂在25 ℃～65 ℃下具有良好的流动性（黏度为35～185 mPa·s），固化时间可控制在0.11～25 h之间，抗压强度达到31～63 MPa，20 ℃～100 ℃范围内胶结强度均大于11 MPa/8 cm；热稳定性优异（分解温度高达380 ℃），并在20 MPa气压下实现零渗透。该封堵剂兼具高强度、高耐温与良好密封性，具备在复杂海洋环境中应用的可行性，可为海上环空压力控制提供技术支撑。Abstract: The problem of annular pressure buildup is especially prominent in offshore high temperature and high pressure oil and gas wells, which is prone to causing leakage, corrosion and failure of wellbore structure, thereby seriously endangering operational safety and wellbore integrity. To address the limitations of conventional cement and resin type plugging materials in flowability, curing controllability and mechanical properties, a novel high-strength epoxy-based plugging agent for operation under non-drilling string conditions was developed. This plugging agent is formulated by blending 35%-55% epoxy resin, 5% hyperbranched resin, 20%-30% diluent and 10%-40% medium-temperature curing agent. This plugging agent was evaluated in laboratory experiments on its rheology, mechanical properties, thermal stability and sealing performance. The experimental results show that this plugging agent has a good rheology at temperatures between 25 ℃ and 65 ℃ (with viscosity ranging from 35 to 185 mPa·s), a curing time that can be controlled between 0.11 h and 25 h, a compressive strength ranging from 31 to 63 MPa, and a bonding strength greater than 11 MPa/8 cm at temperatures between 20 ℃ and 100 ℃. It possesses excellent thermal stability (with decomposition temperature up to 380 ℃), and achieves zero permeability under 20 MPa gas pressure. With high strength, high temperature resistance and excellent sealing capacity, this plugging agent can be used in complex offshore environment and can provide technical support for annular pressure control in offshore wells.
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Key words:
- Sustained annular pressure /
- Epoxy resin /
- Plugging agent /
- Curing time /
- Mechanical strength
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表 1 不同固化剂加量和不同温度下封堵剂的固化时间
T固化/
℃不同固化剂加量下的固化时间/min 25% 30% 35% 40 614 493 350 50 535 420 303 70 526 413 286 
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