bluuebunny/crossref_metadata_2025_split huggingface dataset:
Importancia del índice de la revista de la Academia Nacional de Medicina
Authors: Rojas Nelson A. , Machetá Jenny Milena 
Published: September 2023

FRAGMENTO.
El índice es una herramienta editorial útil y, en muchos casos; imprescindible que tiene sus primeros ejemplos en los códices romanos (codex) en los que se reunían textos de diferentes procedencias, en contraste con el volumen, ejemplar que solía versar en torno a un solo tema o ser de un único autor, para facilitar su consulta. A medida que el libro se fue expandiendo durante el Renacimiento y la Modernidad temprana como mecanismo de comunicación y de transmisión de conocimiento, los índices se consolidaron como parte constitutiva de las obras. En el caso de la revista de la Academia Nacional de Medicina, inicialmente titulada Revista Médica de Bogotá, estamos en el terreno de una publicación periódica seriada que sirvió de órgano de difusión de una sociedad científica, la Sociedad de Medicina y Ciencias Naturales transformada en 1890 en Academia Nacional de Medicina. Las revistas científicas, surgidas en el siglo XVII como resultado de los diversos géneros de intercambio y difusión de noticias científicas (libros, cartas, folletines, diarios, catálogos de libros, entre otros), transformaron la manera en que la ciencia circulaba. La gran mayoría de publicaciones siguieron el modelo del Journal des Sçavans, primera revista científica impresa en Europa, órgano de difusión de la Academia Francesa de Ciencias. Para mediados del siglo XIX, las revistas médicas –especializadas o no– se habían expandido gracias al interés mostrado tanto por profesionales del área, como del público general. Esta dinámica generó la aparición en 1879 del Index Medicus –publicación de la hoy National Library of Medicine de Estados Unidos–, un índice que buscaba enlistar los trabajos publicados en Estados Unidos en el área de la medicina para facilitar su consulta. Esta publicación es considerada como la precursora de herramientas como MEDLINE –hoy PubMed–.
Presentación del libro. Academia Nacional de Medicina de Colombia 1873-2023. Medicina, Ciencia y Humanismo
Authors: Gómez Gutiérrez Alberto 
Published: September 2023

Fragmento:
La obra que se presenta hoy es producto de una iniciativa del presidente, doctor Germán Gamarra Hernández, quien convocó, con el aval de la Junta Directiva, a dos coeditores y, por consenso tripartito, a un grupo de 23 académicos para redactarla con ocasión del sesquicentenario de nuestra corporación. Su objetivo era simple: dar a conocer la historia de una sociedad médica, científica y humanista que ha reunido a protagonistas principales de la medicina nacional con más de un siglo y medio de ejecutorias.
Recapitulación. Centenario de la Academia Nacional de Medicina en 1973
Authors: De Medicina de Colombia Academia Nacional 
Published: September 2023

Fragmento:
En la ciudad de Bogotá a los 23 días del mes de agosto de 1973 se reunió en Sesión Solemne la Academia Nacional de Medicina en el Salón de Actos de la Academia Colombiana de la Lengua, para conmemorar el Primer Centenario de su Fundación (1873-1973).
La Mesa Directiva estuvo integrada por el Señor Presidente de la República, Dr Misael Pastrana Borrero; los Académicos Juan Pablo Llinás, Presidente; Jorge Cavelier, Presidente Honorario; Mario Gaitán Yanguas, Vicepresidente; Julio Araújo Cuéllar, Secretario; Alberto Albornoz Plata, Tesorero y César A. Pantoja, Presidente del Comité Organizador del Centenario, acompañados por los Ministros de Salud Pública y Educación, Doctores José María Salazar Buchelli y Juan Jacobo Muñoz; El Gobernador de Cundinamarca, Doctor Alfonso Dávila Ortiz; el Alcalde Mayor de la ciudad doctor Aníbal Fernández de Soto; el Expresidente de la República Doctor Julio César Turbay Ayala; los doctores Eduardo Guzmán Esponda y Joaquín Piñeros Corpas, Presidente y Secretario Ejecutivo del Colegio Máximo de las Academias; el doctor Germán Zea Hernández y el doctor Armando Roa de Chile, Representante de la Asociación Latinoamericana de Academias Nacionales de Medicina (ALANAM).
Real-Time Prediction of Formation Pore Pressure Using Hybrid LSTM-BP Model
Authors: Yao Xuezhe , Song Xianzhi , Han Liang , Zhang Haolin , Zhu Zhaopeng , Li Baoyu , Zhang Rui 
Published: September 2023

ABSTRACT
Accurate and real-time prediction of formation pore pressure is critical to ensure drilling safety. However, the performance of the most traditional formation pore pressure calculation methods are not satisfied in field applications due to their limited accuracy and time-effectiveness. In this paper, a novel artificial intelligence model is proposed to accurately predict formation pore pressure in real-time. First, the dataset for model training is prepared after handling the outliers and missing values of the drilling and logging data, which collected from 12 wells in Tarim Basin. And the logging data of the offset well is used to develop a logging data prediction model for the well under drilling based on the error Back Propagation Neural Network (BPNN). Then, a hybrid model is created by combining the Long Short-Term Memory Neural Network (LSTM) and the BPNN. Finally, the hybrid LSTM-BP model is trained and validated on the drilling and logging dataset, and the grid search algorithm is used to optimize the hyperparameters of the model. The hybrid LSTM-BP model is utilized to estimate formation pore pressure by inputting the drilling data of the well under drilling and longing data of the BPNN model predicted. The results indicate that the relative error of formation pore pressure prediction is less than 10%. This paper provides an accurate method to predict formation pore pressure in real-time, which is of great significance for maintaining the stability of the wellbore and ensuring the safety of drilling.

INTRODUCTION
Formation pore pressure is the pressure of the fluid in the formation, which is one of the most crucial fundamental data in the process of petroleum exploration and development, and a crucial foundation for the design of drilling plans and the analysis of wellbore stability (Azadpour et al., 2015; de Souza et al., 2021). However, when formation pore pressure is predicted incorrectly, it can lead to drilling risks including gas invasion, kick, and even blowout, which may result in enormous financial losses such as in the Deepwater Horizon tragedy. Therefore, accurate prediction of formation pore pressure in the process of drilling is conducive to ensuring drilling safety, improving rate of penetration (ROP), protecting the reservoir, and improving oil and gas recovery (Lei and Jie, 2004).
Investigation of the Mechanical Properties of Hanna Sandstone Using Newly Installed High Pressure and High Temperature Polyaxial Equipment
Authors: Dabbaghi Ehsan , Ng Kam 
Published: September 2023

ABSTRACT
The design of civil infrastructure requires the assessment of the mechanical properties of rock layers supporting these structures. In this study, a newly installed high-pressure and high-temperature polyaxial equipment at the University of Wyoming is described and used in the mechanical testing. Uniaxial and triaxial compression tests are performed on dry and water-saturated cylindrical sandstone samples obtained from the Hanna Formation, Wyoming. The cylindrical samples are prepared and tested in two different sizes: 1) 25.4 mm diameter by 50.8 mm length, and 2) 76.2 mm diameter by 152.4 mm length. The sandstone samples are vacuum-saturated for 7 and 14 days. For the triaxial compression tests, the samples are subjected to three effective confining pressures of 5, 15 and 25 MPa and under two temperatures of 35 and 55 °C. The results show that the effective confining pressure has a clear positive effect on the compressive strength of all samples. Under the same effective confining pressure, larger samples show higher compressive strength and Young's modulus. For all three effective pressures, the dry samples exhibit higher compressive strengths, Young's modulus and more brittle behavior. Permeability decreases with the confining pressure. P and S wave velocities increase with the confining pressure.

INTRODUCTION
The design and performance of infrastructures can be highly affected by the strength and deformation of the rocks beneath or around them. Characteristics like rock type, sample size, porosity, water content, and temperature can change the strength and deformability of rocks. Studying the simultaneous effect of the aforementioned characteristics can improve our understanding of rock behavior, which leads to more dependable designs of civil infrastructures.
The Hanna Basin is located in southeast Wyoming, bounded by Laramide-aged uplifts (Fig. 1). The formation was formed in the Tertiary period and extends from 0 to 7000 ft below the ground level (Bowen, 1918). A conglomeratic sandstone lays at the base of the formation, with conglomerate, sandstone, shale, and coal beds alternating to the top. In a study (Oliver and Youngberg, 1984) on a unit from the Hanna formation, 72.2% of the rock footage was comprised of Calcareous sandstone. The bulk mineralogy of the Calcareous sandstone was determined as follows: 54% quartz, 9.6% kaolinite, 9% K-Feldspar, 8.4% Dolomite, 6.1% Plagioclase, 5.4% Mica, 3.9% Calcite, 3.4% Siderite, and 0.3% Acmite.
Effects of Dynamic Surge Pressure on Wellbore Stability
Authors: Liu Y. , Dokhani V. , Ma Y. , Miao H. , Zamiran S. 
Published: September 2023

ABSTRACT
This study presents a coupled poroelastodynamic model for wellbore stability analysis considering the effects of tripping operation and the flow communication between wellbore and formation. First, a transient hydraulic model is developed based on transient pressure propagation in the wellbore to predict the generated surge pressures during tripping operation. The transient hydraulic model is transformed into ordinary differential equations using the method of characteristics and is finally solved through the finite difference method. Then, the results are coupled with a wellbore stability model to include the effect of wellbore pressure variation with time. The developed transient hydraulic model is validated through comparisons with available field data and modeling results in the literature. Comparing the surge pressure predictions of the model with field data indicates a consistent and accurate prediction of the transient surge pressure. The results further show that a maximum surge pressure can be expected before approaching an equilibrium surge pressure, which could not be predicted by the previous surge models due to ignorance of the acceleration terms. The total radial and tangential stresses are calculated and shown to vary versus time. The results indicate that the induced pressure initially rises to a maximum value and then decays with time, but the maximum value is not necessarily always at the wellbore wall. The results of tensile and shear failure analysis indicate time-dependent failures can occur in the vicinity of the borehole depending on the magnitude of the tripping velocity.

INTRODUCTION
Tripping is a frequent operation that is running pipes into or out of a well for different reasons, e.g., replacing a dull bit, replacing bottom hole assembly, running logging tools, running casings or liners, and wellbore conditioning. It has long been known that the tripping operation can induce surge or swab pressure if running into or out of the well, respectively. In fact, the axial movement of a drill string, like a piston, in the wellbore results in pressure perturbations. Pioneer studies such as Cannon (1934) and Goins et al. (1951) show that a high tripping velocity can cause drilling problems such as formation fracture or gas kicks. The magnitude of surge pressures typically may not exceed the safe pressure limit in most wells. However, there are critical wells such as deep wells or depleted reservoirs where the surge and swab pressures shall be maintained within a narrow pressure limit. Although a low tripping velocity can avoid borehole problems, such practice will ultimately increase the Non-Productive Time (NPT) and hence the total drilling cost. Accurate prediction of surge and swab pressures helps to find the maximum allowable tripping speed and reduce the NPT, which all optimize the drilling performance. In the first part of this study, a very brief review of fundamental studies about surge/swab modeling and associated wellbore stability concerns is presented.
Fracture Initiation and Propagation Around Calcite Nodule Interfaces
Authors: Dudley J. W. , van Haasterecht M. J. T. , van der Linden A. J. , van Schalm R. , Coorn A. H. 
Published: September 2023

ABSTRACT
Drilling through and production from calcite nodular formations (NF) is a complex issue in some places, where both significant lost circulation problems are encountered during drilling (costing millions of $US), and enhanced production has been seen following hydraulic fracture stimulation, so a better understanding of how these formations fracture and fail is needed to optimize drilling and production in these NF. This paper presents a workflow developed to evaluate fracture initiation and propagation in these NF. It includes specialized triaxial compression testing including acoustic emission (AE) monitoring, and detailed pre- and post-test micro-CT imaging of the samples. It has been used to characterize the strength of interface samples from two NF. The micro-CT imaging of the samples and measured strength clearly show the porous material strength determines the failure strength along the interface. The AE monitoring of interface samples showed that fracturing begins in the porous sandstone near the interface and continues along the interface in the porous material, only entering (if at all) the calcite-cemented material just before macroscopic failure at the final stress drop. The results can be useful for modelling fracture initiation and failure in these NF, and thus contribute to a more optimized drilling and production plan for the NF.

INTRODUCTION
Drilling through and production from formations with significant nodular calcite deposits has been a complex issue in certain basins, where the Nodular Formations (NF) are a significant source of lost circulation (LC) problems during drilling, leading to significant trouble costs (millions of $US) and delays. On the other hand, enhanced production has also been seen from these NF following hydraulic fracture stimulation compared to regions without the nodular deposits, so a better understanding of how these formations fracture and fail is needed to optimize drilling and production in these NF.
This paper documents development of an experimental workflow to quantify the fracture and failure properties of calcite nodular formations. The work was initiated to help improve the understanding and modelling of fracturing in these formations. The calcite nodules described here are within various porous sandstone formations. The nodules themselves are layers within the formation that have regions where the pore space is filled with calcite cement. An example of this type of formation is the Tres Pasos sandstone formation in Chile, shown in Fig. 1. While fracturing in conglomerates and concrete has been studied (e.g., Bazant, 1985, and its references), this nodular formation is different in that the ‘inclusions’ are just calcite-filled pore space regions within the continuous sand matrix, and not a gravel, aggregate, or cobblestone surrounded by a finer grain or cement matrix.
Numerical Modeling of the Bridging Process of Swelling Diverter Particles in a Hydraulic Fracture
Authors: Luo Bo , Han Yanhui 
Published: September 2023

ABSTRACT
Horizontal drilling and multi-stage/multi-cluster hydraulic fracturing are critical technologies that enable the economic production of hydrocarbons from unconventional reservoirs. However, achieving uniform growth from multiple perforated clusters remains a challenge. In hydraulic fracturing operations, some fractures can be overgrown while others are fully suppressed. Near-wellbore diversion is commonly used to promote uniform growth of each cluster in a stage. In this study, a continuum approach of particle transport was implemented and coupled with a fluid flow solver in FLAC to simulate the nonlinear particle propagation and bridging in the near-wellbore diversion process. The effect of swelling behavior of diverters on the bridging location and time inside a fracture, as well as pressure buildup at the fracture entrance, was evaluated. Simulation results showed that the use of swelling particles resulted in the formation of a closed bridging loop with fewer particles and a shorter injection time, and higher fluid pressure at the fracture entrance.

INTRODUCTION
Horizontal drilling and multi-stage/multi-cluster fracturing have become standard practices for the completion of unconventional reservoirs (Economides and Nolte, 2000). However, due to the heterogeneity of the formations, local stress concentration from geological structures, and stress interference from nearby fractures, uneven growth of multiple fractures is commonly observed in the field (Cipolla et al., 2011; Miller et al., 2011). To promote uniform growth, hydraulic fracturing operations often use diverting particles that temporarily block off the over-grown fractures, allowing more injected fluid to be diverted to under-stimulated fractures (Barraza et al., 2017; Daneshy, 2019; Shahri et al., 2016).
Numerical modeling is a valuable tool for understanding, predicting, and designing hydraulic diversion operations. The numerical schemes to model particle transport can be classified into two groups: discrete and continuum approaches. While the discrete approach (Mao et al., 2021; Mondal et al., 2016; Suri et al., 2020; Zeng et al., 2019) has demonstrated accuracy in capturing fluid-particle interactions at the pore-scale and applications in investigating problems related to fluid flow through proppant packs and sand erosion inside fractures and perforations (Fan et al., 2019, 2018; Han and Cundall, 2013, 2011), it suffers from a major drawback of high computational cost.
Casing Force Analysis During MPC Injection Considering the Coupling Effect of Temperature and Pressure
Authors: Liu Jinlu , Li Jun , Li Hui , Yang Hongwei , Liu Gonghui 
Published: September 2023

ABSTRACT
The problem of casing force and deformation during MPC (managed pressure cementing) injection pose great challenges to cementing in deep and ultra-deep Wells. According to the combination structure size of casing, the properties of multi-density and variable volume fluid in casing and annulus, the calculation method of multi-density fluid position change with injection time in cementing process is presented. Combined with causes of casing force during MPC injection stage, a temperature-pressure coupled mathematical model was established to calculate the temperature and pressure of casing caused by injection fluid flow in cementing. The calculation formula of U-tube effect was used to correct the parameters in the model. The energy conservation equation of casing and annulus is given, and wellbore pressure is obtain based on the theory of fluid mechanics. Taking a well A as an example, the model has been well used in pressure prediction and casing force analysis during MPC injection stage. The results show that the casing force is complicated during the injection process. The optimization of displacement can effectively alleviate casing deformation and make the bottom hole pressure in a safe state. The research results provide a theoretical basis for the optimization of construction parameters during MPC injection stage.

INTRODUCTION
The exploitation of ultra-deep oil and gas resources has promoted the continuous breakthrough of drilling technology. At present, there are more than 30 Wells in the world with a depth of over 9000m, which is of great significance for improving self-sufficiency in natural gas, increasing energy supply, optimizing and adjusting the energy structure, and improving people's livelihood. However, increasing well depth has brought great challenges to cementing. Many new problems have emerged (Rostami et al.; Thibodeaux et al., 2018), such as high cement slurry density, high circulating resistance, high liquid column pressure, high surface pump pressure for cementing, and high temperature and pressure formation. These problems have a serious impact on casing deformation during MPC injection stage.
Energized Fracturing with CO2: A Numerical Simulation of the Effects of Thermodynamic Properties of CO2
Authors: Xiao Feng , Salimzadeh Saeed , Zhang Qianbing 
Published: September 2023

ABSTRACT
Energized fracturing with CO2 is considered as an alternative method to conventional water-based hydraulic fracturing, which brings advantages in water conservation and environment protection as well as in hot enhanced geothermal systems (EGS). However, the varying thermodynamic and transport properties of CO2 could be problematic in energized fracturing. To investigate the effects of CO2 pressure-temperature-dependant properties on fracture propagation, an extensive numerical simulation is performed using a robust fracturing simulator developed on Complex Systems Modelling Platform (CSMP-HF). Based on the Span-Wagner equation of state, the thermodynamic and transport properties of CO2 in varied in-situ conditions (i.e., pressure and temperature) during energized fracturing process are calculated. The simulation results show that in-situ stress conditions affect the fracture growth speed under constant CO2 mass rate. The additional storage volume brought by injection system contribute significantly to the hydraulic fracturing speed. Higher propagation speed may result in dynamic fracture propagation and thus resulting in branching, a subject for further research.

INTRODUCTION
Hydraulic fracturing technology plays a key role in promoting efficient energy extraction. Not only hydraulic fractures can enhance the oil and gas production from unconventional reservoirs, but also de-risk coal mining by inducing and controlling the time of goaf events (Adachi et al., 2007; Hou et al., 2021; Jeffrey & Mills, 2000; Middleton et al., 2015). According to the background review commissioned by the Department of the Environment (Commonwealth of Australia, 2014), the estimate in 2012 of Australian economic demonstrated resources of CSG was 35,905 Petajoules, which is equivalent to nearly 10 times the total yearly energy use. Besides, for the future mining cave extensions to massive and deep orebodies in Australia, such as Northparkes mine (Webster et al., 2020), Ridgeway Deeps (Cuello & Newcombe, 2018), and Cadia East (Orrego et al., 2020), hydraulic fracturing is proposed as a profitable and sustainable preconditioning technique to manage and enhance the caving process (Catalan, 2015).