Mechanical Property Analysis and Optimization of Bottom Hole Assembly
The complex formation in the deep hole section has a large dip angle,making it difficult to control the deviation of well,which seriously affects safe drilling.In order to accurately control the well track and improve the angle building ability of drilling tool,the vertical and horizontal bending beam method was used to build a me-chanical calculation model to analyze the influence of factors such as borehole curvature,formation dip angle,span length and outer diameter,flexible pup joint,stabilizer outer diameter,wing rib thrust,WOB and hole an-gle on the mechanical properties of various bottom hole assemblies,and optimized them.The research results show that the bent PDM drill has better deviation prevention and correction abilities compared to straight PDM drill,and is more suitable for use in deep formations with strong angle building force;when the azimuth angle is between 25° and 205°,the lateral force of the formation is the smallest;the borehole curvature of the directional well section has the greatest impact on the guiding force of two types of PDM drill assemblies,followed by the hole angle,and the impact of WOB is relatively small;the thrust of the wing rib has the most significant impact on the angle build-ing force and performance of the bent PDM drill decentralized rotary steering bottom hole assembly(RSBHA),fol-lowed by the WOB,and the influence of the hole angle is relatively small.The research results provide reference basis for the study and control of well deviation in complex formations,and the reasonable assembling and optimi-zation of drilling tools play an important role in reducing well deviation and successfully completing drilling.
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