随着深层和超深层油气资源勘探开发的逐步深入,钻井作业中的井漏问题变得越来越复杂。从现场经验来看,常规封堵材料不能完全满足钻井工程中封堵作业的技术要求。在这项研究中,合成了一种耐高温耐盐聚合物HDZ-A。可以通过添加一定浓度的交联剂和缓凝剂来制备高温延迟交联聚合物凝胶封堵剂。在本文中,以粘弹性和粘度为新开发聚合物的评价标准,通过正交实验确定了HDZ-A的最佳合成条件。分子结构,耐温性,HDZ-A的相对分子质量用红外光谱测定,核磁共振波谱,和凝胶渗透色谱法。此外,以凝胶强度为评价标准,确定了凝胶堵漏剂的最佳配方。结果表明,新研制的堵胶剂经高温交联后性能稳定,并且可以在形成期间抵抗160°C的高温。在160°C的条件下,凝胶化时间可达4.5h,封堵效率可达97%以上。最后,在鄂尔多斯盆地KT-14X直探井进行了新开发的耐高温延迟交联聚合物堵胶剂的现场试验。现场试验表明,HDZ-A凝胶堵漏剂的堵漏效果显著。
With the gradual deepening of the exploration and development of deep and ultra-deep oil and gas resources, the problem of lost circulation in drilling operations is becoming more and more complex. From field experience, conventional plugging materials cannot fully meet the technical requirements of plugging operations in drilling engineering. In this study, a high-temperature- and salt-resistant polymer HDZ-A was synthesized. A high-temperature and delayed crosslinking polymer gel plugging agent can be prepared by adding a certain concentration of a crosslinking agent and a retarder. In this paper, the optimum synthesis conditions of the HDZ-A were determined with orthogonal experiments using viscoelasticity and viscosity as evaluation criteria for newly developed polymers. The molecular structure, temperature resistance, and relative molecular mass of HDZ-A were determined using infrared spectroscopy, nuclear magnetic resonance spectroscopy, and gel permeation chromatography. In addition, the optimal formula of the gel plugging agent was determined using gel strength as the evaluation standard. The results show that the newly developed gel plugging agent has stable performance after high-temperature crosslinking, and can resist high temperatures of 160 °C during formation. Under conditions of 160 °C, the gelation time can reach 4.5 h, and the plugging efficiency can reach more than 97%. Finally, the field test of the newly developed high-temperature-resistant delayed crosslinking polymer gel plugging agent was carried out in the direct exploration well KT-14X in the Ordos Basin. The field test showed that the plugging effect of the HDZ-A gel plugging agent was remarkable.