Experimental and Numerical Simulation Research on Eccentric Flow Channel Erosion of Drilling Robot

doi:10.11885/j.issn.1674-5086.2020.11.02.01

Abstract

Abstract: In order to solve the problem of coiled tubing buckling drilling in extending reach in horizontal wells, a new coiled tubing drilling method of "drilling robot + power drilling tool" driven by drilling fluid was proposed. According to the dimensions, hydraulic pressure consumption, internal structure and manufacturing of the robot, a three-stage eccentric circular flow channel structure is designed. A numerical simulation-unit experiment-numerical simulation method was proposed for the erosion analysis of drilling robot's three-stage eccentric circular flow channel. Firstly, a numerical model for the fluid-structure coupling erosion of drilling robot's three-stage eccentric circular flow channel was established, and the influence laws of particle size parameters and velocity parameters on the erosion rate were analyzed. Secondly, the experiment of drilling robot eccentric channel erosion was carried out to calibrate the numerical model of drilling robot three-stage eccentric circular channel fluid-structure coupling erosion. Based on this, the numerical simulation research of drilling robot three-stage eccentric circular flow channel is further carried out. The results show that the optimal inclination Angle of the three-stage eccentric circular flow channel is 5°. When the flow channel wall thickness is 5 mm, the eccentric flow channel life is more than 300 h, which meets the working life requirements of general downhole tools. The position of main erosion point and erosion pattern of flow passage are in good agreement with the experiment. This provides a theoretical basis for the structural design and engineering application of the drilling robot and is of great significance for promoting the popularization and application of coiled tubing drilling technology in extended-reach horizontal wells.

Key words: coiled tubing drilling, drilling robot, runner design, erosion, numerical simulation

CLC Number:

TE928

XIAO Xiaohua, DAI Jiliang, ZHU Haiyan, ZHAO Jianguo. Experimental and Numerical Simulation Research on Eccentric Flow Channel Erosion of Drilling Robot[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(2): 167-177.

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