固相微粒对裂缝的微观损害机理研究  

Damage Mechanism of Solid-phase Particles to Fractures

作　　者：张蕊[1] 白少波[2] 付春苗[3] 张宁县 

机构地区：[1]延安大学,陕西延安716000 [2]延长油田股份有限公司后勤服务中心,陕西延安716000 [3]吐哈油田勘探开发研究院,新疆哈密839000 [4]吐哈油田工程技术研究院,新疆鄯善8382202

出　　处：《辽宁化工》2013年第8期1019-1022,共4页Liaoning Chemical Industry

摘　　要：固相颗粒封堵储层渗流通道是导致油气层损害的一个重要原因。为了进一步探讨固相微粒封堵裂缝的机理,本文在室内对不同浓度和微粒大小的含有固相微粒的体系对裂缝的封堵效果及影响进行了评价,并通过实验的分析评价不同浓度和颗粒大小的固相微粒对裂缝造成的伤害程度,得出固相微粒对裂缝的伤害主要是由固体微粒的浓度和大小引起,固体微粒含量应小于3%,颗粒粒径不大于孔隙大小的1/5时不堵塞裂缝。固相微粒浓度低且缝宽与粒径的比值较小(<5)时易形成逐步堵塞,固相微粒浓度大或喉径与粒径的比值较大时易形成迅速堵塞。Blocking reservoir seepage paths by solid particles is an important reason to cause formation damage.In the paper,in order to further investigate the blocking mechanism of solid-phase particles for cracks,the blocking effect of solid particle system with different concentrations and particle sizes for fractures was evaluated as well as influence factors.And then through experiment analysis,damage degree of solid particle system with different concentrations and particle sizes for fractures was also evaluated.The results show that concentration and size of solid particles have great effect on the formation damage degree;when solid particle content is less than 3% and particle size is not larger than 1 / 5 of the pore size,cracks will not be blocked;when solid particle content is low,and ratio of the slit width to particle size is less than 5,the blocking happens easily;when solid particle concentration and particle size all are large,cracks will be quickly blocked.

关 键 词：固相微粒 裂缝 临界流速 微观损害机理 

分 类 号：TE25[石油与天然气工程—油气井工程]