Abstract:

In order to improve the success rate of high temperature and complex formation structural oil wells, the preparative temperature sensitive self?consolidation resin is used to modify the surface of the aggregate material, and the thermally consolidated rigid plug material is obtained, then auxiliaries are chosen to build a novel bridge sealing and thermal consolidation plugging system that could resist temperature to 190 ℃. Infrared spectroscopy, thermal analysis, scanning electron microscopy were employed to study the molecular structure, microstructure and thermal stability of the resin, thermally consolidated rigid plug material and the plugging system, the suspension stability, consolidation rate, consolidation strength and permeability of the plugging system were also investigated. The results show that the constructed plugging system has the advantages of good suspension stability and wide solidification time window in bentonite slurry with mass fraction of 5%, and the compressive strength of the solidified body after curing at 90~190 ℃ are all over 6 MPa; at the same time, the water phase permeability of the solidified body cured at 190 ℃ is 6.32×10³ μm² under the driving pressure of 12 MPa, and the plugging rate is more than 98.00%. It is expected to meet the plugging requirements of high?temperature formation.

Key words: Plugging material, Thermosensitive self?consolidation resin, Thermal consolidation material, Suspension stability, Compressive strength, Permeability

摘要：

为了提高高温及复杂地层结构油井堵漏施工成功率，以制备出的温敏性自固结树脂对骨料材料进行表面改性，获得热致固结型刚性堵漏材料，配合其他助剂构建了可抗温至190 ℃的架桥封堵?热致固结高温堵漏体系。采用红外光谱、热分析、扫描电镜等分析手段，研究了温敏性自固结树脂、热致固结型刚性堵漏材料及架桥封堵?热致固结高温堵漏固结堵漏体系的分子结构、微观形貌及热稳定性。测试了架桥封堵?热致固结高温堵漏固结堵漏体系在膨润土浆中的悬浮稳定性、固结速率、固结体强度和渗透率等性能。结果表明，构建的堵漏体系在质量分数为5%的膨润土浆中具有悬浮稳定性好、固结时间窗口宽等优点；在90~190 ℃的温度下固化后，固结体抗压强度均达到6 MPa以上；在12 MPa的驱替压力及190 ℃的温度下固化的固结体的水相渗透率为6.32×10³ μm²，封堵率大于98.00%，有望满足高温地层的堵漏要求。

关键词: 堵漏材料, 温敏性自固结树脂, 热致固结材料, 悬浮稳定性, 抗压强度, 渗透率