TECHNOLOGY FOR CONTINUOUSLY CONTROLLING INCLINED WELL'S DEVIATION IN THE COURSE OF ROTARY DRILLING

In the course of rotary drilling of inclined well,the hole deviation control is mainly realized by use of the angle building,angle dropping and angle holding tools composed of stabilizer and drill collar.Through the mechanical analysis of lower drill string and applying the drill string assembly composed of the “regulator for the placement of downhole stabilizer” recently developed,the distance between the stabilizer and bit is unchangeable and the hole deviation performance is relatively stable in case of normal drilling.After the drilling's being stopped,the extending and shrinking sizes of the regulator are changed through regulating pump pressure or weight on bit from the surface,making the distance between the stabilizer and bit and the hole deviation performance be changed.Through on site application,it is shown that this regulator can change the placing position of the downhole stabilizer and hole deviation performance by a simple operation from the surface,avoid round trip operation for recomposing drill string assembly and realize a continuous control of inclined well's deviation in the course of rotary drilling.