硅酸盐颗粒材料封堵大孔道的研究

Study on the Blocking Technology of High-Capacity Channels

李志华 唐永安 屈人伟 张庆春 初伟 宁士华 占程程

LI Zhi-Hua TANG Yong-An QU Ren-Wei ZHANG Qing-Chun CHU Wei NING Shi-Hua ZHAN Cheng-Cheng

本文针对孤岛油田开发过程中由于地层非均质性严重而导致的汽窜、水窜等问题，开展了硅酸盐颗粒型堵剂封堵技术的研究, 评价了≤0.8 mm、0.8～1.2 mm和≥1.2 mm粒径范围的硅酸盐颗粒悬浮液固结体的抗压强度、渗透率等性能指标并进行了现场应用。结果表明：在相同实验条件下，粒径小的硅酸盐颗粒所形成的固结体的抗压强度高、渗透率低；所形成的固结体耐温性能良好。现场施工时，借鉴孤岛油田防砂的经验，根据储层渗透率以及地层砂粒度中值来选择硅酸盐颗粒粒径的大小及组合方式，一般采用粒径≤0.8 mm的硅酸盐颗粒悬浮液作为前置段塞，粒径0.8～1.2 mm的颗粒悬浮液作为后置段塞，共实施了8口井，现场试验证明该技术对改善注气剖面和产液剖面，提高注汽、降低油井含水效果显著。

Aimed at the serious problems of steam channeling and water channeling in Gudao oilfield development process due to formation heterogeneity, the silicate particulate plugging technology was developed. The compressive strength and the permeability of the consolidation body prepared from silicate particulate with different particle sizes of≤0.8 mm, 0.8～1.2 mm and≥1.2 mm were measured and other performance evaluation and core flow experiments were carried out. The results showed that under the same experimental condition, the smaller the silicate particles, the higher the compressive strength of the consolidation body, and the lower the permeability of the consolidation body. The temperature-resistance of the consolidation body was excellent. From oil sand controlling experience in the field, the silicate particles size and combination was selected according to the reservoir permeability and formation sand median. Generally, the silicate suspensions which the particle size was less than 0.8 mm and in range of 0.8～1.2 mm were used as ahead slug and post slug, respectively. 8 wells were implemented using the silicate particulate plugging technology. Field test proved that the technology could improve gas injection, production profile and steam injection effect, lower water content in oil wells.