Accurate identification of the water outlet point after a horizontal well has produced water is difficult, resulting in difficulty in blocking water. This article proposes improved water plugging technology for general plugging of the wellbore. In this technology, the organic polymer UF and the inorganic rigid reinforced particle MMT are combined to obtain composite at the nanometer scale for a horizontal well plugging. FIRT, XRD, TG-DSC, SEM, and other methods are used to characterize the structure of intercalated composite materials. The results show the successful MMT modification and pre-polymer synthesis reaction. The performance of the composite plugging agent is evaluated by a rotating rheometer, mechanical experiment, and plugging experiment. The initial viscosity of the plugging agent in a rheological test is 28.81 mPa·s, which shows that the plugging agent has good injectability and is not affected by shear. The solidified strength of the plugging agent material is 11.45 MPa, which meets the plugging requirements. In the core physical simulation experiment, the breakthrough pressure gradient reaches 86 MPa/m, indicating that the plugging strength of the plugging agent is high, the plugging rate is still more than 90% after 40 hours of water scouring, and the erosion resistance is strong. Compared with other plugging agents, UF-OMMT plugging agent has better thermal stability. Hence, the developed plugging agent has good application prospects.

水平井产水后的出水点难以准确识别，造成堵水困难。本文针对井筒的一般堵水提出了改进的堵水技术。该技术将有机聚合物UF和无机刚性增强颗粒MMT结合，获得纳米级复合材料，用于水平井封堵。FIRT、XRD、TG-DSC、SEM等方法用于表征插层复合材料的结构。结果表明成功的MMT改性和预聚物合成反应。复合封堵剂的性能通过旋转流变仪、力学实验和封堵实验进行评价。流变试验中封堵剂的初始粘度为28.81 mPa·s，说明封堵剂可注入性好，不受剪切影响。封堵剂材料的凝固强度为11.45 MPa，满足封堵要求。在岩心物理模拟实验中，突破压力梯度达到86 MPa/m，说明封堵剂封堵强度高，水冲40小时后封堵率仍达90%以上，抗冲刷能力为强的。与其他封堵剂相比，UF-OMMT封堵剂具有更好的热稳定性。因此，所开发的堵漏剂具有良好的应用前景。突破压力梯度达到86 MPa/m，表明封堵剂的封堵强度高，水冲40小时后封堵率仍在90%以上，抗冲刷能力强。与其他封堵剂相比，UF-OMMT封堵剂具有更好的热稳定性。因此，所开发的堵漏剂具有良好的应用前景。突破压力梯度达到86 MPa/m，表明封堵剂的封堵强度高，水冲40小时后封堵率仍在90%以上，抗冲刷能力强。与其他封堵剂相比，UF-OMMT封堵剂具有更好的热稳定性。因此，所开发的堵漏剂具有良好的应用前景。