In order to demonstrate the design scheme of the air-cushion surge tank for a hydroelectric project,the hydraulic fracturing technology is adopted to define the in-situ stress and related rock mechanical parameters of rock mass surrounding the high pressure cavern.

Based on the theoretic model, formation stress may be derived from constraint inversion method with use of imaging data of borehole collapse and hydaulic fractures, in such away that not only the maximum horizontal stress profile but also the minimum one can be obtained, and further the formation breaking pressure, which is helpful to borehole stability analysis and fracturing design.

Calculated are the rock and formation stress parameter with mechanics law; built is the mechanics model of calculation of capillary pressure under the condition of formation stress, so, we can get more reliable information about the formation.

Through analyzing frecuring data of many wells in the Ordovician formation in central Tarim basin,it is found that formation stress information in pressure-time curves obtained from the fracturing data may reflect the true formation stress.

on original stress.

Described are an effective method and practical applications for determining the formation stress field using borehole cross-dipole acoustic logging data.

Application of stratified stress method in massive hydraulic fracturing design