毛细管自吸水作用引起凝胶脱水现象研究  

Gel Dehydration by Spontaneous Imbibition Under the Action of Capillary Force

作　　者：王健[1] 吴丰豆 张庆[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500

出　　处：《精细石油化工进展》2015年第5期6-8,共3页Advances in Fine Petrochemicals

摘　　要：岩石基质孔道在毛细管力作用下会引起凝胶脱水,现从孔隙结构的角度入手,研究其对凝胶脱水的作用。结果表明,毛细管力对凝胶具有明显的脱水作用,脱水过程受周围岩石基质孔道大小的影响,岩石越致密引起凝胶的脱水现象越严重,且脱水速率随孔吼直径的减小而加快;毛细管自吸水作用引起凝胶的脱水速度比盐水引起的脱水慢;与其他影响凝胶脱水的因素比较,基质孔道的吸水作用是在短时间内完成的。因此,在现场利用凝胶进行调堵施工作业时,应充分考察地层孔隙结构对凝胶脱水的影响,有助于提高凝胶封堵施工效率。Gel dehydration can be caused by rock matrix channel under the action of capillary force. Gel dehydration was studied from the perspective of pore structure. According to the results of study, capillary force can cause significant dehydration of gel with the dehydration process being affected by the sizes of surrounding rock matrix channels, the more denser the rock is, the severer the dehydration is, and the dehydration rate increases as the pore size reduces. The gel dehydration rate caused by spontaneous imbibition under the action of capillary force is smaller than that caused by brine water. Compared to other factors affecting the dehydration of gel, the water absorption action of matrix channel is completed in a relatively short time period, and for this reason adequate consideration shall be given to the effect of the pore structure of formation on gel dehydration when carrying out the profile control and blocking operation with gel at site which is beneficial to increasing the efficiency of gel blocking operation.

关 键 词：凝胶脱水 毛细管 自吸水作用 孔隙结构 调剖堵水 

分 类 号：TE358.3[石油与天然气工程—油气田开发工程]