水泥试样爆炸压裂模拟试验  

Explosive fracturing simulation test of cement samples

作　　者：程远方[1] 寇永强[1] 徐鹏[1] 李蕾[1] 张晓春[1] 

机构地区：[1]中国石油大学石油工程学院,山东东营257061

出　　处：《中国石油大学学报（自然科学版）》2010年第5期69-72,76,共5页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家'863'计划课题(2007AA06Z208)

摘　　要：对常压及施加围压条件下的爆炸压裂进行模拟试验,并对爆炸压裂后的试样取心进行渗透率测定,结合爆破理论对爆炸压裂效果进行分析。结果表明:爆炸压裂后试样整体渗透率提高明显,与常压下形成的裂纹相比,施加围压后裂纹多集中在炮眼附近,且生成的裂纹数量多,但长度较短,并存在不同程度的弯曲,在局部区域还出现了环形裂纹;爆炸压裂后渗透率变化基本符合爆破分区规则,在距离中心孔5～7倍炮眼尺寸的区域内,受宏、细观裂纹的共同影响渗透率增加明显,为原始渗透率的几十倍,中心孔向外,随传播距离加大渗透率增幅逐渐降低,在爆破远区试样受冲击作用不够明显,渗透率变化不大。The simulation tests of explosive fracturing were carried out under different confining pressure. The permeability of cores obtained from the testing samples was measured. And the explosive fracturing effect was analyzed combined with explosive theory. The results show that the sample permeability increases significantly. Compared with the results under atmospheric pressure,the cracks fractured under confining pressure are grouped at the area that close to the blast hole and the number of cracks was much more but the length of those cracks was shorter than those under atmospheric pressure,and there also appeared circular cracks. After the explosive fracturing,the permeability change generally consists with the blasting division rule, because of the combining effects of macro cracks and micro cracks. The permeability of the area that is away from the blast hole 5-7 times of the size of the blast hole increases significantly and is several dozen times of the original permeability. Outward from blast hole to border of samples,increasing rates of permeability decreases gradually,and the area that is far away from blast hole named blasting far-zone is not affected significantly by explosive energy and the permeability changes little.

关 键 词：低渗透油气藏 爆炸压裂 模拟试验 围压 渗透率 

分 类 号：TE357.3[石油与天然气工程—油气田开发工程]