Abstract: The drilling mud leakage, formation fluid overflow, well wall collapse, formation breakdown, reservoir pollution and other anomalies are mainly controled by pore pressure, fracture pressure and collapse pressure ("three pressures"), which are common problems faced by drilling technicians. Establishing a "three-pressure" profile before drilling, a safe drilling mud density window can be designed to ensure drilling safety for oil field exploration and development.Using wireline formation testing for directly obtaining pore pressure and dipole acoustic logging method for predicting rupture and collapse pressures, the continuous profile of formation fracture and collapse pressures can be established, based which the "three pressures" results database and online query system in Junggar basin have been provided for designers of drilling, geology and downhole operations. The effect is proved to be good in two-year appliction by Xinjiang Oilfield Company.

Key words: dipole acoustic, wireline formation testing, pore pressure, fracture pressure, collapse pressure, fine evaluation