The Research Of Drilling And Completion Technology Of Stairs Horizontal Well

The main research contents of drilling and completion technology of Stairs horizontal well contains optimization of casing program of stairs horizontal well,section design,mechanical analysis on down hole string and field experiments in order to improve the technology of drilling and completion technology of Stairs horizontal well.The calculation method of lifting limit value of horizontal segment was established and the mathematical models and calculation methods was build to optimize the casing program.Associated with the site construction conditions,given the control range of lifting limit value of horizontal section and propose practical control project and measures in Stairs horizontal segment associated with the laws of deflecting of BHA in different formation.Study on selection principles and steps of hydraulic thruster and propose its operation technology.Establish the calculation method of the critical rotate speed of rotary table when composite drive the screw drill tool,and give the critical rotate speed of rotary table of common drill tools in different stairs horizontal segment.Establish the calculation models and methods of frictional resistance and torque of drill string.Establish the evaluation method of drill string's passing capacity and give the evaluation results.At the same time,the methods are researched.The methods include three items,such as judging the horizon by lithology and natural gama,the correction method for well depth in cutting logging,predicting the relationship between the micro structure and the well track.Based on the casing string' friction resistance and strength calculation result complete the judgment of its passing capacity.And the design of the mount position of centralizer in stairs horizontal segment was completed based on the analysis result of the centering degree of casing string.