地应力对垂直裂缝高度的影响及缝高控制技术研究

地应力是影响垂直裂缝高度最重要的因素,理想的裂缝高度等于目的层的厚度,裂缝在垂向上过度延伸会带来很多不利影响。在前人研究的基础上,总结了地应力与裂缝高度的关系、裂缝垂向过度延伸的影响、目的层与邻近地层最小水平主应力的关系、裂缝高度控制的对象及缝高控制工艺技术,对压裂设计和现场施工具有一定的指导意义。

Impact of earth stress on vertical fracture height and technique of fracture height control

The earth stress is the principal factor to vertical frac- ture height.The perfect fracture height shall be equal to that of the target stratum,and the excessive extension of fracture in the vertical direction will engender adverse effects.On the basis of previous studies,presented in the paper are the rela- tionship between the earth stress and the fracture height,the effects of vertically excessive extension of fracture,the rela- tionship between the target stratum and the minimum hori- zontal principal stress of the adjacent stratum,the object of fracture height control,and the fracture height control tech- nique,which is of guiding significance to the fracturing de- sign and the on-site operation.