超分子聚合物堵漏技术在长庆油田恶性漏失井的应用

长7页岩油储层致密但流体流动性好，砂岩储层存在微米级孔隙，加上存在断层构造，导致钻进过程中渗透性漏失、裂缝性漏失甚至失返性漏失频发，常规堵漏材料无法满足钻井施工要求，造成非生产时间和成本大幅度增加，严重制约了勘探开发进程。借助超分子化学理论，通过合成优化配方，研发出了新型超分子聚合物防漏堵漏材料，并对其微观结构、剪切稀释性和恶性漏失承压堵漏能力进行了表征与测试。研究结果表明，超分子聚合物堵漏材料不仅具有优异的剪切稀释性和黏附能力，而且对两层钢珠床（钢珠直径8～10 mm）模拟的大孔隙性漏失和直缝板（缝宽2～6 mm）模拟的裂缝性漏失均具有较强的承压堵漏效果，承压达6 MPa。在长7页岩油区块典型恶性漏失井应用表明，超分子聚合物堵漏技术可以有效提高裂缝性漏层的承压能力，减少漏失量并降低综合堵漏成本，助力长7页岩油勘探开发，值得进一步研究和推广。 

Application of Supramolecular Polymer Plugging Technology in Changqing Oilfield

The Chang 7 shale oil reservoir is tight but has good fluid fluidity, which has micron-scale pores and fracture structure, leading to frequent permeable loss, fractured loss and total loss during the drilling process. Conventional plugging materials cannot meet the drilling construction requirements, resulting in a significant increase in non-production time and costs, and severely restricting the exploration and development process. Based on the theory of supramolecular chemistry, this research developed a new type of supramolecular polymer plugging material through synthesis formula optimization, and characterized and tested its microstructure, shear thinning and loss mitigation and pressure-bearing plugging ability. The research results show that the supramolecular gel plugging material not only has excellent shear thinning properties and adherence abilities, but also has a strong pressure-bearing plugging effect in large pore loss zones simulated by two-layer steel ball beds (the steel ball diameters are 8 mm ～ 10 mm) and fractured loss zones simulated by longitudinal slotted plate (the fracture widths are 2 mm～6 mm), with a pressure-bearing capacity up to 6MPa. Its application of typical total loss well in Chang 7 shale oil block shows that supramolecular gel plugging technology can effectively improve the pressure-bearing capacity of fractured loss zones reducing loss volume and comprehensive plugging costs, and helps Chang 7 shale oil exploration and development. Thus, it is worthy of further research and promotion.