Assessment of induced fracturing and fracture sealing during drilling

Article Energy & Fuels

The Role of Particle Size Distribution for Fluid Loss Materials on Formation of Filter-Cakes and Avoiding Formation Damage

Karl Ronny Klungtvedt et al.

Summary: Numerous studies have shown that careful particle size selection is crucial for reducing fluid loss when drilling permeable or fractured formations. Conventional particle size methods are adequate for designing a fluid for wellbore stabilization purposes, but for optimization of reservoir drilling fluids, a different particle size selection method is more effective in preventing formation damage.

JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME (2023)

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Article Energy & Fuels

Measuring filter-cake cohesive strength and flowability

Karl Ronny Klungtvedt et al.

Summary: The filter-cake plays a critical role in reducing the wellbore permeability temporarily to prevent various issues. Its strength measurement is important for optimal drilling fluid design. By using a rheometer, the strength and flowability of filter-cakes were measured, and it was concluded that the addition of cellulose-based fibers can significantly increase the filter-cake strength.

GEOENERGY SCIENCE AND ENGINEERING (2023)

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Article Energy & Fuels

Comparison of Lost Circulation Material Sealing Effectiveness in Water-Based and Oil-Based Drilling Fluids and Under Conditions of Mechanical Shear and High Differential Pressures

Karl Ronny Klungtvedt et al.

Summary: A study was conducted to evaluate the performance of granular and fibrous lost circulation materials in water-based and oil-based drilling fluids. The findings showed that CaCO3-based and synthetic graphite-based materials experienced significant degradation and reduced sealing performance after exposure to fluid shear and mechanical degradation. In contrast, cellulose-based materials exhibited superior resistance to mechanical wear and minimal changes in sealing performance.

JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME (2022)

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Article Energy & Fuels

Experimental and numerical analysis of effective enhancement of wellbore stability in shales with nanoparticles

Chao Gao et al.

Summary: The study demonstrates that using nanoparticles in test fluids can effectively seal pores and micro-fractures in shales, reducing pore pressure transmission and improving wellbore stability. By developing a mathematical model and conducting experiments, the research identifies optimal nanoparticle combinations for different types of shales and provides insights into enhancing drilling fluid properties to mitigate hydration and swelling issues in shale formations.

JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING (2021)

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Article Energy & Fuels

The Fundamental Principles and Standard Evaluation for Fluid Loss and Possible Extensions of Test Methodology to Assess Consequences for Formation Damage

Karl Ronny Klungtvedt et al.

Summary: This study developed a new experimental set-up and methodology to evaluate changes in porous discs after HTHP testing in order to identify signs of formation damage. The results showed a positive correlation between changes in disc mass and changes in permeability, suggesting that the methodology can effectively detect formation damage. Further studies are recommended to optimize the method.

ENERGIES (2021)

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Article Energy & Fuels