Vibration characteristics analysis and experimental study of new drilling oscillator

Abstract

In new drilling conditions such as extended reach drilling or long horizontal well, to avoid large friction between drill string and wellbore or weigh on bit decreasing, a new drilling vibration tool (called antifriction oscillator) is presented in this article. For discussing its working mechanism and performance, first, the kinematics models are established based on the structure design parameter, and then the horizontal vibration models are presented according to drilling conditions. With the numerical example results, it can be concluded that the frequency of the flow area between the static and dynamic valve plates is proportional to the flow rate. Moreover, with the increasing size of static valve plate, the flow area is increasing while the total axial force is decreasing. Furthermore, according to the experiment test results with static valve plate hole diameter 35.56 mm, the vibration results are discussed by comparing with numerical example results, and it can verify the analysis models' rationality and the calculation formulas' correctness. The research results provide basis for theoretical research and field applications of drilling oscillator. Furthermore, by changing corresponding parameters, the research methods and models can also provide reference for the design of new methods or tools of drilling friction reduction or rate of penetration increasing technologies.

Study on the Influence of Geometric Parameters on Vibration Characteristics of Hydraulic Oscillator Used in Oil Drilling

“…These studies mainly focus on the impact of vibration frequency, vibration load, pressure, and flow rate on the drag reduction effect of hydraulic oscillator. In addition, some researchers conducted research on drag reduction model [16] , vibration mathematical model [17][18] , and friction resistance prediction [19] of hydraulic oscillator. However, the above literature lacks research on the geometric parameters of hydraulic oscillator.…”

Fault analysis and reliability evaluation for motorized spindle of cycloidal gear grinding machine based on multi-source bayes

“…Lundgren [26] proposed a data-driven fault classification algorithm to deal with imbalanced datasets, class overlap, and unknown faults and evaluated the practicability of this method. Wang [27] performed finite element modal analysis on a rotary vector (RV) reducer, determined the frequency distribution and deformation of each…”

Kinematics and dynamics analysis of new rotary-percussive PDM drilling tool

“…With the change of exploration conditions of oil and gas reservoir and new demand for high efficiency or environmental protection, the downhole operation faces more complex and difficult condition; therefore, many demands have become more urgent such as improving ROP, reducing the friction between wellbore and drill string, avoiding the stick-slip phenomena, and so on. 26–32 At the same time, exploration and exploitation of oil and gas inevitably lead to a more complex stratigraphy.…”