| With the development of oil exploitation towards low permeability and unconventional reservoirs,drilling engineering is a very important work in petroleum exploration and development,especially in the development of directional drilling.As an important tool of bent housing screw drill directional drilling is also gradually occupy the entire power tool industry,however,with the increase of drilling difficulty,put forward higher requirements for the design and use of screw drill,for the design and manufacture of screw drill,including the use of the research literature is more,this paper on the basis of previous on the basis of the research,related data collection and research of bent housing screw drill can be used at home and abroad of directional drilling is completed,the structure and working theory of drilling directional analysis of bent housing screw drill for various parts of the principle,and according to the characteristics of kinematics and dynamics of drill string,the establishment of directional drilling with theoretical mechanics model of bent housing of screw drill and the finite element software,the main parts of the bent housing screw drill is designed and simulated,the bent housing screw drill The study of statics and dynamics in the drilling process is a theoretical basis for the reliability of bottom hole assembly into the bottom of the well.The main research contents of this paper:(1)The related data collection and analysis of directional drilling at home and abroad have been completed.Through the investigation and analysis of the design and operation of power tools for directional drilling,the research plan and research train of thought in this paper are put forward.(2)Based on the detailed analysis of directional drilling with bended screwdrill and working mechanism,through field investigation,and access to a large number of domestic and foreign literatures,collection of screw drill main components and working mechanism,provide an important basis for the design and manufacture of directional drilling with bent screw drill set.(3)The structure and working principle of directional drilling theory knowledge analysis of various parts of the bent housing screw drill,and drill according to the characteristics of kinematics and dynamics of directional drilling column,using the theory of mechanics of bent housing screw drill model of bent housing screw drill in the drilling process of static calculation and dynamic analysis,finite element results in the drill string the bottom of the comparative theory foundation.(4)According to the scene of petals vulnerable parts of stress and deformation of large serious position,mode analysis is carried out by using the finite element software of petal type cardan shaft,to find out the changes of vibration frequency,vibration fault is found petals of high and low cycle fatigue damage,petal high cycle fatigue damage,which is mainly the petals of alternating stress is in resonance condition,and put forward the universal shaft design and use of a new type of structure,through the universal of high strength shaft assembly analysis,the main parts of the work intensity can meet the requirement for the manufacture and use,000 shaft design,provide a theoretical basis,in order to maximize play the function of the cardan shaft and prolong its service life.(5)The finite element analysis of the curved shell connecting thread of the curved shell drilling tool is carried out.The stress of the threaded end of the trapezoidal thread male buckle is much larger than that of the female thread,and the stress on the top of the male thread is higher than that of the other parts.Through finite element analysis,different compressive loads the threaded portion of the stress distribution in the periodic change of the circumferential direction,an important reason is the compression load connection thread gluing,thread strength with the pressure and torque load changing,contribute to the load properties of the fatigue failure of the qualitative and quantitative judgment on the drive shaft in the stress state of underground work provides a safety evaluation basis.(6)Through the comparison of the key components of the transmission shaft of two kinds of structure analysis,to the extent possible,increasing the transmission shaft path radius,displacement and lateral force and drive shaft effect improved force is reduced,the stress distribution and the improvement of the same but the peak stress decreased,followed by the radius increases the shaft shoulder transition,in order to reduce the stress concentration,through strength analysis proved that the improved design is reasonable and feasible.(7)In this paper,through the analysis of the real change of the model,the velocity changes more in line with the actual changes of fluid,fluid in the overall position change,with eddy and changes in water flow through the rapids,near the fluid velocity and pressure have the mutation,along the main channel fluid path,position and velocity pressure in the small.When the entrance plane and the horizontal plane are kept at 0 degrees,the final velocity and pressure are the smallest,and the erosion of the water cap is the smallest.(8)The bottom shell bending BHA static simulation analysis,established at the bottom of the bent housing BHA static simulation analysis model,analyzed the bent housing assemblies in vertical section and the curved section position of the drill pipe stress,the drill pipe in curved section,Von Mises reached the maximum stress is 783.3MPa.Including the ratio of bent housing BHA stress near the pipe position relative to other more,here are more prone to fatigue fracture of drill pipe.In this paper,through the research work related theory of directional drilling and bended positive drill motor,a comprehensive and systematic study of the working mechanism of the main structure of bended positive drill motor,to ensure that the required tools into the strength of the adjustable bent shell structure has important theoretical significance and practical value to improve the reliability and service life. |
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