Prediction of formation fracture pressure with logging data in Tahe oilfield;

Rock mechanical parametric experiments and the research of formation fracture pressure prediction

Effects of crustal stresses and natural fractures on fracture pressure of coal reservoirs

Determining breakdown pressures in transversely isotropic formation by multipole array acoustic logs;

By combining with formatting density logging,we calculated parameters of rock elasticity and intensi- ty using multi-pole array acoustic logging,and performed for- rnation stress analysis to determine breakdown pressure and drilling fluid density.

Then breakdown pressure,caving pressure and drilling fluid density can be obtained,which will act as references for drilling design to guide safe drilling.

Establishing the models for calculating the fracturing pressure of formation rock during oil/gas wells fracturing by using fracture mechanics theory;

Based on the influence of stress sensitivity on the logging surface fracturing pressure,an interpretation model for.

A vast amount of information of drilling、testing and new logging technologies are used to analyze and process four wells logging data in extremely difficult drilling area with complex geologic structure,from which we have obtained geostress distribution features,rock mechanical and wellbore stability parameters including rock strength,fracturing pressure and sanding index,etc.