低渗透气层岩心破裂裂缝扩展实验分析  

Experiment analysis of fracture propagation in core fracturing of low permeability gas reservoirs

作　　者：牟善波[1] 张士诚[1] 韩秀玲 

机构地区：[1]油气资源与探测国家重点实验室中国石油大学,北京昌平102249 [2]中油勘探开发研究院,北京100083

出　　处：《特种油气藏》2012年第1期92-94,140,共3页Special Oil & Gas Reservoirs

基　　金：国家重大科技专项"大型油气田及煤层气"(2008ZX05024-03-003-004)

摘　　要：为了加深对低渗透砂岩气层压裂过程中裂缝扩展的认识,同时便于科学指导施工,利用CT技术等方法,对含有天然裂缝低渗透砂岩气层的裂缝扩展规律进行了研究。研究结果表明,加压及注液能够造成岩心出现裂纹并扩展,主裂纹与微裂纹在成因上有一定的关系,在一定的应力作用下,岩石在一些具有微裂纹的平面先破裂,随着压力的增加或持续压力作用,微裂纹将会扩展并相互连接,最终形成宏观裂缝。To better understand the fracture propagation during fracturing of low permeability sandstone gas reservoirs and facilitate field operations,the CT(computer tomography) and other technologies have been used to study the fracture propagation pattern in low permeability sandstone gas reservoirs with natural fractures.Study results indicate that pressurizing and fluid injection will result in fractures and their propagation in the core and the major fracture is,to some extent,related to the micro-fractures in terms of genesis.Under a certain stress,the rocks will first fracture on the plane with micro-cracks and the micro-cracks will propagate and connect with each other with the increase of pressure or under continuous pressure,resulting in a macro fracture.

关 键 词：低渗透砂岩气层 岩心 裂缝扩展 力学实验 

分 类 号：TE312[石油与天然气工程—油气田开发工程]