Computer Simulation Of Interaction Between Hybrid Bit And Rock

With the increase of drilling depth,the rock properties become more and more complex.In order to effectively explore oil and gas resources,it is necessary to optimize the drilling tool and improve the drilling efficiency.Therefore,based on the optimized design of the bit structure,a hybrid bit with integrated cone bit structure and PDC bit structure is proposed.The performance research of bit mainly relies on on-site testing,which not only consumes a lot of manpower and financial resources,but also wastes a long time.Therefore,in order to better study the performance of hybrid bit,based on the geometry and kinematics of cone bit and the geometry and kinematics of PDC bit,as well as the rock breaking mechanism of bit,this paper uses computer simulation technology to study the process simulation simulation of the interaction between hybrid bit and rock.The specific research contents are as follows:(1)By analyzing the rock breaking methods and characteristics of the cone bit and PDC bit,the basic structure,rock breaking mechanism,and advantages and disadvantages of the hybrid bit are summarized;Through consulting and collecting the relevant data of geometry and kinematics of the cone bit and PDC bit,this paper analyzes the basic theory of geometry of the hybrid bit,establishes the coordinate system with the hybrid bit as the main body,and obtains the equation used to determine the spatial position of the cone cutting teeth and PDC cutting teeth.(2)Establish mathematical and simulation models for the main working parts of the interaction between the hybrid bit and rock,such as the teeth and the bottom of the well,study the force acting on the teeth and the balance mechanism of drilling pressure during the rock breaking process,and finally obtain the simulation model and flowchart of the entire system.A computer simulation system for the interaction between hybrid bit and rock was developed using Microsoft Visual Studio software and C# language.The simulation software was designed and run,resulting in the bit footage curve,mechanical drilling speed curve,bottom hole simulation model,and vertical load on the bit ring and each cone.(3)The effects of drilling pressure and cutting tooth shape on the performance of hybrid bit were studied,and the results showed that drilling pressure and cutting tooth shape are important factors affecting the mechanical drilling speed of hybrid bit.The higher the drilling pressure,the higher the mechanical drilling speed of the hybrid bit,and the greater the vertical load on the cone and blade;The mechanical drilling speed and vertical load on the cone of a hybrid bit vary depending on the cutting tooth shape.(4)The effects of tooth rake angle and lateral angle on the performance of hybrid bit were studied,and the results showed that changes in tooth rake angle and lateral angle would affect the mechanical drilling speed and vertical load on the blade of the hybrid bit.A relatively optimized tooth rake angle was obtained.Based on the computer simulation system for the interaction between hybrid bit and rock in this article,the performance of hybrid bit can be studied,which has certain guiding significance for improving tooth design,optimizing the cutting structure of bit,and improving rock breaking efficiency.