Theoretical Research and Experimental Verification of Borehole Trajectory Control Technology in Petroleum Drilling and Completion

Abstract

Objective: In response to the challenges posed by wellbore trajectory deviations in petroleum drilling and completion, this study
develops a theoretical model for wellbore trajectory control techniques. By conducting simulation experiments, the study validates critical
technical indicators and optimizes trajectory control strategies under deep-well and complex formation conditions.Methods: A mathematical
model of wellbore trajectory and a force analysis model of the drill string are constructed. Simulation experiments are designed to investigate
wellbore trajectory degradation rates, the anticipated lifespan of the drill string, and model prediction errors. Experimental data under varying
weight-on-bit (WOB) and rotational speed conditions are employed to evaluate the model’s performance and the effectiveness of trajectory
control.Results: The wellbore trajectory degradation rate exhibits nonlinear growth with increasing well depth, reaching a peak value of 0.0010
m/m. Drill string lifespan decreases from 72,000 cycles to 51,000 cycles as wellbore curvature and vibration frequency escalate. Model prediction errors remain stable at 0.05 m, substantiating the model’s high accuracy and applicability.Conclusion: Optimizing wellbore curvature
and implementing real-time trajectory correction algorithms are critical for mitigating trajectory deviations and extending drill string lifespan.
The proposed model demonstrates robust applicability, offering theoretical and practical support for enhancing wellbore trajectory control
technology under complex operational conditions.