What is it about?

This is about assessing the impact of drilling on the rock structure and how it affects well stability. In Iran, the high stress conditions post-drilling often lead to borehole instability, risking the well's productivity. The focus is on using the Ultrasonic Borehole Imager (UBI) to evaluate borehole conditions, specifically looking at borehole shape analysis. The study aims to enhance our understanding of well stability, detect instability early, and take precise remedial actions based on image log data to prevent or address issues affecting the well's integrity.

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Why is it important?

Ensuring a well's stability post-drilling is crucial for its long-term productivity. In Iran, high stress conditions can cause borehole instability, risking the well's efficiency. Understanding the impact of drilling on borehole shape and stability is vital for effective hydrocarbon production. Using the Ultrasonic Borehole Imager (UBI) as an analysis tool helps assess structural integrity, but interpreting its data for borehole shape analysis requires refinement. This study focuses on improving early detection of wellbore instability and enhancing insights into well conditions through advanced borehole shape analysis using image logs. Precisely identifying areas of instability allows for targeted corrective actions, preserving the well's functionality and extending its operational lifespan.


The drilling process disrupts natural stress conditions underground, potentially affecting borehole stability. In Iran, high stress levels persist even after mud weighting attempts to balance them. For effective hydrocarbon production, maintaining borehole integrity post-drilling is crucial. Borehole instability can drastically impair a well's productivity and shorten its operational lifespan. Using imaging tools like the Ultrasonic Borehole Imager (UBI) aids in structural analysis and fracture identification. However, accurately interpreting these tools for assessing borehole shape remains a challenge. This study delves into enhancing early detection of wellbore instability and refining insights into well conditions through advanced borehole shape analysis using image logs. Pinpointing areas of instability with precision allows for targeted corrective measures, ensuring the well's optimal functionality and prolonged efficiency.

Dr Zohreh Movahed

Read the Original

This page is a summary of: Evaluate the borehole condition to reduce drilling risk and avoid potential well bore damages by using image logs, Journal of Petroleum Science and Engineering, October 2014, Elsevier,
DOI: 10.1016/j.petrol.2014.07.027.
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