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Related Experiment Video

Updated: May 27, 2026

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

Published on: November 20, 2014

A method for collapse pressure analysis while drilling through fractured clay formations.

Chen Zhuo¹, Cui Guojie², Su Jian²

¹CNOOC Tianjin Branch, Haichuan Road No. 2121, Binhai New District, Tianjin, China. 1241295765@qq.com.

Scientific Reports

|May 25, 2026

Summary

This summary is machine-generated.

This study simplifies complex seepage-stress-damage models into a strength softening model for real-time drilling analysis. This new model, using logging data for parameter determination, effectively managed wellbore stability in a thick clay formation.

Keywords:

Collapse Logging Real-time Strength softening

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Published on: June 12, 2019

Area of Science:

Geotechnical Engineering
Petroleum Engineering
Drilling Engineering

Background:

Existing "seepage-stress-damage" models are complex and parameter-intensive, limiting their use in real-time drilling operations.
These models are primarily used for pre-drilling prediction and post-drilling evaluation of collapse pressure, not for immediate analysis during drilling.

Purpose of the Study:

To simplify the "seepage-stress-damage" model into a strength softening model suitable for real-time wellbore collapse analysis during drilling.
To develop a method for determining the strength softening model parameters using readily available logging data.

Main Methods:

Simplification of the "seepage-stress-damage" model into a strength softening model.
Development of a parameter determination method utilizing logging data.
Application of the strength softening model by field engineers to adjust drilling fluid properties.

Main Results:

The simplified strength softening model proved effective for real-time collapse analysis.
The proposed method allowed for practical parameter determination using logging data.
Adjusting drilling fluid properties based on the model led to minimal wellbore collapse (0.2 cm × 0.23 cm blocks) in a 1000 m thick clay formation.
Efficient drilling was achieved in the challenging clay formation.

Conclusions:

The strength softening model offers a practical and effective approach for real-time wellbore stability management during drilling.
The integration of logging data for parameter estimation enhances the applicability of the model in field operations.
This simplified modeling approach contributes to efficient drilling operations and improved wellbore integrity.