摘要
海拉尔盆地大部分井隔层/产层应力差小,有效控制压裂裂缝高度是保证施工成功的关键技术。假定浮式、沉式控缝剂在裂缝端部分别形成具有一定厚度和应力强度(梯度)的人工隔层获得了裂缝剖面上的应力分布。应用线弹性断裂材料的I型裂缝静态延伸准则,首次建立了人工隔层条件下的裂缝高度延伸控制方程,可以定量描述缝流体压力对裂缝高度的控制作用和人工隔层对裂缝高度延伸的影响。通过编制计算机程序模拟,研究了控缝剂对裂缝高度延伸的控制作用,模拟表明使用控缝剂形成人工隔层可以有效控制压裂缝高度。现场应用证明了采用人工隔层遏制海拉尔盆地压裂裂缝高度延伸是可行的。该方法可以用于现场控缝高压裂设计。
Fracture height control is the key technique to make successful hydraulic fracturing in Hailaer Basin because of a small stress difference between barrier and payzone formation.Firstly,stress distribution is obtained,which is induced by artificial barrier with certain thickness and stress strength(graduate) formed by buoyant/setting additive.Secondly,control equation of fracture height is established on the basis of type I crack propagation criterion in linear elastic fracture mechanism,and control role of fluid pressure in crack and effect of artificial barrier on fracture height are quantitatively described.Then,affections of artificial barrier is researched with computer simulation,hydraulic fracture height can be effectively controlled and it is proven from field case in Hailaer Basin.So,this method can be used in oilfield design.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第1期70-72,共3页
Journal of Southwest Petroleum University(Science & Technology Edition)
关键词
海拉尔盆地
水力压裂
裂缝高度
人工隔层
模拟
Hailaer Basin
hydraulic fracturing
fracture height
artificial barrier
simulation
