A novel transient hole cleaning algorithm for horizontal wells based on drift-flux model

Sun, Xiaofeng; Yao, Di; Qu, Jingyu; Sun, Shihui; Qin, Zuhai; Tao, Liang; Zhao, Yuanzhe

doi:10.1016/j.geoen.2023.212517

Cited by 16 publications

(3 citation statements)

References 25 publications

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“…On the basis of Eickmeier's research, You [18] and Dong [19] used numerical methods to solve the unsteady wellbore heat transfer model. With the deepening of research, Alves [20] and Sun [21] combined the wellbore heat transfer and steady-state flow control equations and proposed a quasi-steady-state analytical equation of wellbore temperature under injection conditions. Hasan [22] and Kabir [23] successively established pseudo-steady-state and unsteady-state wellbore two-phase flow and heat transfer models and extended them to the solution of wellbore temperature distribution under different working conditions during drilling and completion.…”

Section: Supercritical Co 2 Phase Control Technologymentioning

confidence: 99%

A Review of Supercritical CO2 Fracturing Technology in Shale Gas Reservoirs

Hou,

Yuan,

Chen

et al. 2024

Processes

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Shale gas reservoirs generally exhibit characteristics such as low porosity, permeability, and pore throat radius, with high airflow resistance. Currently, hydraulic fracturing is a commonly used method for commercial shale gas extraction; however, the hydraulic fracturing method has exhibited a series of issues, including water sensitivity and reservoir pollution in shale reservoirs. Therefore, the development of anhydrous fracturing technology suitable for shale gas reservoirs has become an urgent requirement. The supercritical carbon dioxide fracturing technique has the merits of reducing reservoir damage, improving recovery and backflow rates, and saving water resources. Moreover, this technique has broad application prospects and can achieve the effective extraction of shale gas. To enhance the understanding of the supercritical carbon dioxide fracturing technique, this review summarizes the progress of current research on this technique. Furthermore, this study analyzes the stage control technology of supercritical carbon dioxide during the fracturing process, the interaction characteristics between supercritical carbon dioxide and rocks, and the laws of rock initiation and crack growth in supercritical carbon dioxide fracturing. The outcomes indicate that after SC-CO2 enters the reservoir, CO2 water–rock interaction occurs, which alters the mineral composition and pore throat framework, weakens the mechanical characteristics of shale, reduces the rock fracturing pressure, and increases the complexity of the fracturing network. This article provides a reference for research related to supercritical carbon dioxide fracturing technology and is greatly significant for the development of shale gas reservoirs.

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Section: Supercritical Co 2 Phase Control Technologymentioning

confidence: 99%

A Review of Supercritical CO2 Fracturing Technology in Shale Gas Reservoirs

Hou,

Yuan,

Chen

et al. 2024

Processes

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“…In quiescent fluid, the settling of spherical particles involves two forces: drag force and buoyant force. As spherical particles commence settling, acceleration occurs when the buoyant force exceeds the drag force, and simultaneously, the drag force acting on the particles continuously increases [30]. When the drag force acting on the particles equals the buoyant force, acceleration reduces to zero, and the particles maintain a constant settling velocity, referred to as the final settling velocity [12,31,32].…”

Section: Drag Coefficient Modelmentioning

confidence: 99%

A New Model for Predicting Drag Coefficient and Settling Velocity of Coarse Mineral Particles in Newtonian Fluid

Xu,

Shen,

Zhang

et al. 2024

Minerals

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Efficient transport in vertical pipeline hydraulic lifting systems is vital for coarse-grained ore, necessitating a deep comprehension of the settling traits of coarse mineral particles. In this study, we conducted a series of settling experiments on individual coarse particles in Newtonian fluids with varying viscosities, employing a self-designed and manufactured settling apparatus. A total of 133 sets of experimental data on the free settling of coarse particles in Newtonian fluids were obtained by recording the particle settling process with a high-speed camera and applying image processing techniques. A mechanical model was employed to perform statistical analysis on the experimental data and establish a predictive model for the drag coefficient and an explicit predictive model for the settling terminal velocity of coarse-grained ore in Newtonian fluids. The average relative errors between the predicted values and experimental values of the drag coefficient and settling terminal velocity models are 4.26% and 7.34%, respectively. This confirms the reliability of the provided predicted model, providing a theoretical foundation for determining the hydraulic lifting speed of coarse mineral particles in vertical pipelines for deep mining.

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“…In recent years, the escalating global demand for energy has propelled the extensive exploration and utilization of unconventional oil and gas resources. Notably, unconventional reservoirs are characterized by lower permeability [1][2][3][4] . Before formal extraction, reservoir transformation is often a prerequisite, and CO2 fracturing stands out as a commonly employed method for such transformation [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

A Prediction Method for the Initiation Pressure of Pre-CO 2 Fracturing Considering the Modification of Rock Mechanical Parameters after CO 2 Treatment

Kong,

Sun,

Wei

et al. 2024

Preprint

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The utilization of CO2 fracturing fluid presents a notable reduction in the challenges associated with reservoir opening, particularly in dense and unconventional reservoirs. The widespread adoption of this technique underscores its efficacy. The establishment of a more realistic CO2 fracturing model serves to elucidate the intricate mechanisms underlying CO2 fracturing transformation. Additionally, it furnishes a foundational framework for devising comprehensive fracturing construction plans. However, current research has neglected to consider the influence of CO2 on rock properties during CO2 fracturing, resulting in an inability to precisely replicate the alterations in the reservoir post-CO2 injection into the formation. This disparity from the actual conditions poses a substantial limitation to the application and advancement of CO2 fracturing technology. This work integrates the variations in physical parameters of rocks after complete contact and reaction with CO2 into the numerical model of crack propagation. This comprehensive approach fully acknowledges the impact of pre-CO2 exposure on the mechanical parameters of reservoir rocks. Consequently, it authentically restores the reservoir state following CO2 injection, ensuring a more accurate representation of the post-fracturing conditions. The research findings reveal that post-CO2 treatment, the elastic modulus of reservoir shale experiences a reduction of 12.5%, Poisson's ratio decreases by 11.8%, tensile strength decreases by 7.9%, permeability increased by 180%. Additionally, the pre-injection of CO2 into the reservoir induces a notable increase in pore pressure in the near wellbore zone. In comparison with conventional numerical simulation methods, the approach outlined in this paper yields a reduction in the error associated with predicting fracturing pressure by 9.8%. The model and methodology presented herein serve as a practical tool for accurately forecasting the initiation pressure of CO2 fracturing.

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A novel transient hole cleaning algorithm for horizontal wells based on drift-flux model

Cited by 16 publications

References 25 publications

A Review of Supercritical CO2 Fracturing Technology in Shale Gas Reservoirs

A Review of Supercritical CO2 Fracturing Technology in Shale Gas Reservoirs

A New Model for Predicting Drag Coefficient and Settling Velocity of Coarse Mineral Particles in Newtonian Fluid

A Prediction Method for the Initiation Pressure of Pre-CO 2 Fracturing Considering the Modification of Rock Mechanical Parameters after CO 2 Treatment

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