A Mathematical Approach Using Thermoporoelastic Model for Reamer While Drilling Efficiency Analysis and Closeness

Roohi, Abbas; Nascimento, Andreas; Elmgerbi, Asad; Prohaska-Marchried, Michael; Thonhauser, Gerhard

doi:10.19026/rjaset.13.2884

Cited by 2 publications

(3 citation statements)

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“…Roohi et al, (2016-a and b) concluded that using the RWD method in a medium-permeable formation with permeability of 1 mD ( [21]) in water-based muds, resulted in greater drilling efficiency, when compared with the conventional approach of using a full-hole drill bit size that drilled the entire hole size at once. The discussions in [22][23] analytically demonstrated the benefit of using multi-diameter RWD system to create weakening of the zone prior to the involvement of reamer in drilling, and the optimum reamer to bit size ratio as well as the distance between them. In the mentioned work, a medium-permeable formation (with permeability of 1 mD) was considered to be drilled using an RWD system composed of a reamer installed 15 m above the pilot bit, with 20% larger in size than the pilot bit, and a typical rate of penetration (ROP) of 30m/hr was assumed.…”

Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

“…To validate the mentioned analytical findings by [23] about the effect of using a reaming while drilling system on wellbore weakening, this work focuses on an experimental investigation and validation. This was carried out by using a developed RWD pilot-reamer configuration and an engineered procedure of drilling rock samples in a fully monitored drilling test facility setup.…”

Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

“…An efficient method of investigation of rock weakening around the wellbore is based on a thermo-poro-elastic modelling (see [21][22][23] for drilling and [24][25] for coring). In this approach, the so-called Analytical Mechanical Specific Energy (AMSE) is estimated for a certain radius of wellbore (Figure 1) by averaging the Apparent Rock Strength (ARS) at the insitu stress conditions.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Investigation of Drilling Performance Improvement Using Reaming While Drilling

Roohi

Ashena

Thonhauser

et al. 2021

Journal of Energy Resources Technology

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This work investigates the drilling performance by reaming while drilling (RWD) using a dual-body bit and compared it with conventional drilling by a standard drilling bit. The dual-body bit consisted of a 2.45-in pilot bit located at a short distance ahead of a 2.47*3.97-in reamer. Conducting a series of drilling experiments at a simulation drilling rig with full monitoring sensors, we further studied the drilling performance as a function of the distance between the pilot bit and the reamer which affect mud diffusion and the resultant change in pore pressure and stress. A method was devised to eliminate the drill-string vibration and its effect on the drilling performance and the energy consumed. The mechanical specific energy (MSE) calculated for each case was considered as a drilling performance indicator. Using two laboratory experiments as well as analytical thermo-poro-elastic calculations of the Mechanical Specific Energy (MSE), the MSE changes were monitored and recorded. Comparison of this drilling performance indicator was used in both the RWD and the conventional drilling assembly to analyze the effect of RWD. Based on the results, with increasing the distance between the pilot bit and reamer, there is an increase in improvement of drilling performance in terms of MSE reduction. The best drilling performance indicator (MSE reduction of 84%) was observed with the distance between the pilot bit and the reamer of 43.3 cm. This is considered a novel finding in reaming while drilling.

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Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Experimental Investigation of Drilling Performance Improvement Using Reaming While Drilling

Roohi

Ashena

Thonhauser

et al. 2021

Journal of Energy Resources Technology

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Comprehensive Wellbore Stability Modeling by Integrating Poroelastic, Thermal, and Chemical Effects with Advanced Numerical Techniques

Shokir,

Sallam,

Abdelhafiz

2024

ACS Omega

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Wellbore stability in extreme drilling environments remains a critical challenge. This study advances the understanding of these complexities through a comprehensive numerical modeling approach. By incorporating thermal, chemical, and hydraulic effects, four refined models were developed to simulate wellbore behavior under high pressures and temperatures. A comparative analysis of four failure criteria and a detailed investigation into the impact of fluid properties on pore pressure and stress distribution provide novel insights. The results indicate that pressure distribution and stress variations around the wellbore are significantly influenced by poroelastic, thermal, and chemical effects. The poroelastic effect increases pressure due to overbalanced drilling conditions, while thermal effects vary with fluid temperature, leading to notable pressure changes. Chemical effects are significant, with lower salinity mud increasing pore pressure and higher salinity decreasing it. Thermal effects primarily dominate stress distribution, altering radial, tangential, and axial stresses, with tangential stresses peaking in the direction of minimum horizontal stress. Collapse area predictions suggest that Mohr-Coulomb and Drucker-Prager criteria predict larger collapse areas compared to Mogi-Coulomb and Modified-Lade criteria, indicating a more conservative approach. Poroelastic effects slightly enlarge collapse areas due to increased pore pressure, while thermal effects reduce collapse areas with cooling and increase them with heating. Higher salinity mud improves formation stability by enhancing effective stress and reducing pore pressure. The results demonstrate that using higher salinity mud enhances formation stability and that careful management of temperature can mitigate stress variations and collapse risks. Regular monitoring and adjustments based on wellbore stability models are essential for optimizing performance and safety in drilling operations. The findings reveal that optimizing mud salinity and carefully managing temperature can effectively enhance formation stability, which offers practical guidelines for mitigating wellbore risks and optimizing drilling operations in challenging formations.

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A Mathematical Approach Using Thermoporoelastic Model for Reamer While Drilling Efficiency Analysis and Closeness

Cited by 2 publications

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An Experimental Investigation of Drilling Performance Improvement Using Reaming While Drilling

An Experimental Investigation of Drilling Performance Improvement Using Reaming While Drilling

Comprehensive Wellbore Stability Modeling by Integrating Poroelastic, Thermal, and Chemical Effects with Advanced Numerical Techniques

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