砂岩储层射孔压实伤害评价  

Evaluation of perforating damage for sandstone

作　　者：朱秀星 张林[2] 薛世峰 仝兴华[3] 滕岳珊 

机构地区：[1]中国石油大学储运与建筑工程学院,山东青岛266580 [2]胜利石油管理局测井公司,山东东营257000 [3]山东大学威海校区,山东威海264209

出　　处：《中国石油大学学报（自然科学版）》2014年第1期137-142,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技重大专项(2011ZX02006-002);中国石油大学(华东)研究生创新基金项目(13CX06065A)

摘　　要：基于应变率对砂岩孔隙度演化的敏感性分析,建立砂岩储层射孔压实伤害评价力学模型。对射孔冲击载荷作用下近孔道砂岩的动力学响应进行数值分析,获得模型中关键力学参数,量化分析砂岩径向孔隙度与渗透率分布,评价射孔压实伤害程度。研究结果表明:数值分析数据与试验数据能够较好地吻合,验证了射孔压实伤害评价方法的有效性;由于破碎带与网状微裂缝的产生,射孔后孔道内壁表层砂岩孔隙度要高于初始值;压实带内砂岩的渗透率明显降低,严重影响孔道流动性能;距孔道入口端轴向距离越远,砂岩的压实带厚度、孔隙度与渗透率伤害程度越小;随冲击载荷强度的增加或岩石强度的降低,射孔压实伤害程度将增大。Based on the sensitivity analysis of deformation rate effect on porosity evolution, the mechanical model for evalua-ting perforating damage of sandstone was developed. Combining with mechanical parameters at different time, which were ob-tained by dynamic response analysis of sandstone around the perforation tunnel, the distributions of radial porosity and perme-ability were studied. Then, the perforating damage degree was evaluated. The results were compared with experimental data,and the validity of the evaluation method was proved to be effective. The results also show that the porosity near the tunnel iseven somewhat higher than undamaged average porosity because of crushing of grains or tensile fractures around the perfora-tion wall. In addition, porosity and permeability of sandstone in crushed zone reduce significantly, which impairs the flowperformance of perforating tunnel severely. Furthermore, the more distance from the entrance of the tunnel, the smaller thereducing amplitude of crushed zone thickness, porosity and permeability will be. When the shock load intensity increases orthe strength of sandstone decreases, the damage degree will be severe.

关 键 词：应变率 孔隙度 渗透率 伤害评价 砂岩 

分 类 号：TE37[石油与天然气工程—油气田开发工程]