分层地应力描述技术及应用

Technique and application of layering earth stress description.

地应力对石油勘探开发的全过程都有重要影响,压裂、注水参数的选择同样受其影响。在全三维压裂设计软件的应用过程中,由于缺乏油藏分层应力数据的计算,压裂设计软件往往难以发挥其优势,如何描述地应力和地应力在压裂实践中的应用也一直困扰着人们。该文基于广义虎克定律,建立了适用于水力压裂裂缝为垂直裂缝的地应力计算模式。该技术已应用于水力压裂参数设计和确定极限注水压力,取得了较好的效果。

Earth stress always affects the whole process of petroleum exploration and development. The selection of fracturing and waterflood parameters is also affected by it. During the application of full 3-D fracturing design software its advantages can' t be showed for lacking of layering earth stress value calculation. How to describe and use the earth stress into the fracturing practice are puzzling people all along. A new calculation mode of the earth stress of vertical fracture is built based on generalized Hook' s law in this paper, which is suitable to hydraulic fracturing cracks. The technique has been used to design hydraulic fracturing parameters and to determine the extreme waterflood pressure, and it has achieved good results.