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Related Experiment Video

Updated: Jul 12, 2026

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

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Published on: November 20, 2014

Enhancing formation breakdown pressure using optimized drilling fluid additives with preventive wellbore

Ahmadreza Abdshahi¹, Amir Farnia Shalmani¹, Seyed Morteza Mirabbasi²

¹Department of Petroleum and Geo-Energy Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.

Scientific Reports

|July 10, 2026

Summary

Optimizing drilling fluid additives, like lost circulation materials (LCMs), significantly enhances wellbore strengthening. This improves formation breakdown pressure (FBP) and fracture reopening pressure (FRP), crucial for preventing drilling fluid losses.

Keywords:

Drilling fluid properties Formation breakdown pressure Fracture reopening pressure Laboratory Investigation Lost circulation materials Plastering effect Preventive wellbore strengthening

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Pore-scale Imaging and Characterization of Hydrocarbon Reservoir Rock Wettability at Subsurface Conditions Using X-ray Microtomography

Published on: October 21, 2018

Area of Science:

Petroleum Engineering
Drilling Engineering
Wellbore Integrity

Background:

Formation fracture pressure evaluation is critical for preventing induced fracturing and drilling fluid losses.
Conventional approaches consider formation breakdown pressure (FBP) an intrinsic rock property, independent of drilling fluid characteristics.
Lost circulation remains a significant challenge in oil and gas well drilling operations.

Purpose of the Study:

To investigate the impact of drilling fluid sealing performance on formation breakdown pressure (FBP) and fracture reopening pressure (FRP).
To evaluate the effectiveness of lost circulation materials (LCMs) in enhancing wellbore strengthening and preventing fluid losses.
To assess the role of drilling fluid additives in improving the pressure-bearing capacity of formations.

Main Methods:

Prepared twenty-five drilling fluid formulations with various lost circulation material (LCM) combinations.
Evaluated fluid loss behavior and mud cake quality using an API filter press apparatus.
Assessed the five best-performing drilling fluids using a wellbore strengthening evaluation device.

Main Results:

The optimal LCM combination resulted in a thin, low-permeability mud cake with superior sealing properties.
Significant increases were observed: up to 42% in formation breakdown pressure (FBP) and 95% in fracture reopening pressure (FRP).
API filter press data showed qualitative agreement with wellbore strengthening test results, suggesting its utility as a preliminary screening tool.

Conclusions:

Well-designed drilling fluids incorporating effective LCMs play a vital role in preventing lost circulation.
Improving drilling fluid sealing performance demonstrably enhances wellbore strengthening and pressure-bearing capacity.
API filter press tests offer a rapid, cost-effective method for preliminary screening of drilling fluid formulations for wellbore strengthening applications.