Tian Yuexin, Liu Yintao, Dong Haifeng, Liu Xiangjun, Huang Jinjun
Petroleum Engineering Technology Institute of Southwest Petroleum Branch, China Petroleum & Chemical Corporation (SINOPEC), Deyang 618000, China.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China.
Gels. 2025 Jun 22;11(7):482. doi: 10.3390/gels11070482.
In this study, a novel semi-liquid gel material based on bisphenol A-type epoxy resin (E51), methylhexahydrophthalic anhydride (MHHPA), and epoxidized soybean oil (ESO) was developed for high-performance wellbore sealing. The gel system exhibits tunable gelation times ranging from 1 to 10 h (±0.5 h) and maintains a low viscosity of <100 ± 2 mPa·s at 25 °C, enabling efficient injection into the wellbore. The optimized formulation achieved a compressive strength exceeding 112.5 ± 3.1 MPa and a breakthrough pressure gradient of over 50 ± 2.8 MPa/m with only 0.9 PV dosage. Fourier transform infrared spectroscopy (FTIR) confirmed the formation of a dense, crosslinked polyester network. Interfacial adhesion was significantly enhanced by the incorporation of 0.25 wt% octadecyltrichlorosilane (OTS), yielding an adhesion layer thickness of 391.6 ± 12.7 nm-approximately 9.89 times higher than that of the unmodified system. Complete degradation was achieved within 48 ± 2 h at 120 °C using a γ-valerolactone and p-toluenesulfonic acid solution. These results demonstrate the material's potential as a high-strength, injectable, and degradable sealing solution for complex subsurface environments.
在本研究中，开发了一种基于双酚A型环氧树脂（E51）、甲基六氢苯酐（MHHPA）和环氧大豆油（ESO）的新型半液体凝胶材料，用于高性能井筒密封。该凝胶体系的凝胶化时间可调，范围为1至10小时（±0.5小时），并在25℃下保持<100±2 mPa·s的低粘度，能够有效地注入井筒。优化后的配方仅用0.9 PV的用量就实现了超过112.5±3.1 MPa的抗压强度和超过50±2.8 MPa/m的突破压力梯度。傅里叶变换红外光谱（FTIR）证实形成了致密的交联聚酯网络。通过加入0.25 wt%的十八烷基三氯硅烷（OTS），显著增强了界面附着力，产生了391.6±12.7 nm的粘附层厚度，约为未改性体系的9.89倍。在120℃下，使用γ-戊内酯和对甲苯磺酸溶液，48±2小时内实现了完全降解。这些结果证明了该材料作为复杂地下环境中高强度、可注射和可降解密封解决方案的潜力。
