FEM simulation result on the tensile strength of the DFDRs shaft.

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Schematic showing the maximum radius of DFDR-inserted flexible drill...

Cross-sectional view of DFDRs main functioning parts.

A typical grid independence test procedure: (a) the third-to-last...

Meshing of the models: (a) meshing of the shaft model; (b) meshing of...

Simulation and Field Studies on an Innovative Downhole Machine Designed for Ultrashort-Radius Horizontal Well Drilling Engineering

Article

Full-text available

Jan 2023

Chenglong Li
Zongtao Chen
Zenglin Wang
[...]
Kun Wang

Ultrashort-Radius Horizontal Well (URHW) drilling engineering plays an important role in increasing the recovery factor of old oilfields. By sidetracking old wellbores at a very high build-up rate, the URHW can effectively exploit the residual oil near old wellbores. Currently, the main problem faced in URHW drilling engineering is the reduced torq...