| Our screw drill with the needs of drilling engineering,application domain expands unceasingly,Already from the beginning of directional well,Large displacement well,Horizontal well and vertical well.In recent years the development of large-scale promotion.Vertical well drilling and river crossing engineering.My company in cao-86 block Directional and vertical drilling and the drilling process.The screw drill and PDC bit drilling method,The oblique effect is very obvious,but also to ensure that the high mechanical speed.So as to achieve the purpose of improving drilling efficiency.This paper gives a detailed analysis of the screw itself structure on BHA build rate influence,Study of applying geometric deflection rate calculation method,The use of a reasonable calculation model for screw drilling tools theory build-up rate calculation.Calculation of screw motor pressure.In order to provide the basis for calculation of parameters of screw output parameters.Analysis of screw geometry parameters,drilling parameters,drilling fluid property parameters of the screw drill pressure and output properties,To establish the calculation model of pressure drop for screw drilling tool.Screw drill internal structure on the basis of understanding,considering the structure of screw parameters,dri lling fluid property,stator,rotor material characteristics and movement characteristics and stress condition,establish screw motor volume efficiency and mechanical efficiency calculation model,To calculate the screw drill actual output rotational speed and torque.The screw drill common failure forms and causes of analysis,put forward the improvement of screw drill is used,to extend the working time of the observations and recommendations.Finally,elaborated screw plus PDC bit compound drilling technology and its application effect.Combined with previous theoretical research foundation.Analysis of screw drill and PDC bit with composite drilling technique in Chaoyanggou Oilfield in cao-86 block directional well application anti-deviation beating fast test results. |
