Abstract
Abstract. Vibration and high shock are major factors in the failure of downhole tools. It is important to study the causes of vibration and shock formation to prevent failure of the drillstring and bottom hole assembly (BHA). At present, it is generally recognized that the vibration of drillstring is the main reason for the failure, especially the lateral vibration. In this paper, the bottom tool of Rotary Steering Drilling System (RSS) calculation model was established based on the secondary development of ABAQUS software. Starting from the initial configuration of drilling tool, considering the contact impact of drilling tool and borehole wall, the dynamic excitation of guide mechanism and the drilling pressure, torque, rotational speed, gravity, buoyancy, drilling fluid damping. The dynamic characteristics of the inherent frequency and dynamic stress of the bottom hole assembly (BHA) were calculated and analyzed, and risk assessment method based on the quantitative vibration intensity was established. The reliability of typical drilling tool is evaluated, which provides a reference for the optimization design of BHA of Rotary Steering Drilling System.
Highlights
Drillstring and downhole tool failure usually results from failing to control one or more of the vibration mechanisms
The dynamic characteristics of the inherent frequency and dynamic stress of the bottom hole assembly (BHA) were calculated and analyzed, and risk assessment method based on the quantitative vibration intensity was established
We developed a secondary development software based on commercial finite element software, which reduces large amount of work for calculation method and program verification
Summary
Drillstring and downhole tool failure usually results from failing to control one or more of the vibration mechanisms. To develop practical and commercial computing software about drillstring dynamics, the model established must take lithology, bit type, drill assembly, damping and contact into consideration, through a lot of experiments and experiment data analysis, comparison with theoretical computing results, various parameters or boundary conditions in theoretical calculation can be corrected. It takes a lot of hard work to develop software for drillstring dynamics. The reliability of typical drilling tool is evaluated, which provides a reference for the optimization design of drilling tools
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