The Research Of Secure Drilling Fluid's Window In Hailaer Oilfield

Hailaer oilfield lies in the sunken of the hailaer basin. Its geological deposition condition is very complex, and the layer pressure alters greatly in different area. Therefore, it's easy to leads to dill accident, such as blowout, circulation loss. The oilfield's proving and exploitation will be effected and the economical expense will be enormous. So calculate, forecast, and control three layer pressure is one important part of the drilling process.In order to solve these problems ,the text basing on drill hole survey and fracture information, brings out analysis and calculate methods of the layer interspaces pressure ,breakdown pressure and hole wall's collapse pressure in mainly areas of the Hailaer oilfield .It also establishes section pictures of the wells belonging to different blocks that describe the changes with deepness. According as these pictures, it can easily optimizes dill bit, advances rate, confirms reasonable scope of the drilling fluid, and offers pledge for deeply prospecting and exploitation. The text analyzed three pressure profiles and discovered that using sound wave time difference method can achieve exact predictive values. Breakdown pressure can be calculated with the Eton mode, Steve mode, Huangrongzun mode and well log data. Contrasting to the whole bag of tricks, we discovered that using Huangrongzun mode to predict breakdown pressure is more exactly. Mohr-coulomb mode can suffice the engineering's precision for predicting Collapse pressure. Eventually, reasonable and securable drilling mud destiny of different blocks can be ascertained.