Environmentally friendly nanoshale inhibitor in aqueous-based wellbore fluids

EP4612254A1Pending Publication Date: 2025-09-10SAUDI ARABIAN OIL CO
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Patent Information

Application Number
EP2023817905
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-10-27
Filing Date
2023-10-31
Publication Date
2025-09-10

AI Technical Summary

Technical Problem

Water-based drilling fluids face challenges with shale swelling, leading to instability during well drilling due to issues like sloughing, bit balling, and high drag, which traditional shale inhibitors like sodium chloride and potassium chloride exacerbate, posing environmental concerns.

Method used

Incorporating mesoporous silica nanoparticles (MSNs) encapsulated in a surfactant into the aqueous wellbore fluid composition, which act as effective shale inhibitors, maintaining wellbore stability and reducing environmental impact.

Benefits of technology

The use of MSNs as shale inhibitors enhances wellbore stability, reduces shale erosion, and minimizes environmental toxicity, providing a more efficient and sustainable alternative to conventional inhibitors, thereby improving drilling efficiency and reducing construction costs.

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Abstract

A wellbore fluid composition includes an aqueous base fluid and mesoporous silica nanoparticles (MSNs). The MSNs are encapsulated in a surfactant. A method of drilling a wellbore includes circulating an aqueous drilling fluid into the wellbore while drilling and recovering shale cuttings from the aqueous drilling fluid. The aqueous drilling fluid includes mesoporous silica nanoparticles encapsulated by a surfactant.
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