bluuebunny/crossref_metadata_2025_split huggingface dataset:
Possible Scenarios of CO2 Injection Through a Thermal Induced Fracture Predicted by an Analytical Model
Authors: Su K. , Dechelette B. , Pujol G. 
Published: November 2023

Abstract
The multidisciplinary studies in the project phase of CO2 storage in depleted sandstone reservoir raised a lot of questions, one of these is related to the risk of thermal induced fractures (TIF) leading to a sustained injectivity increase. What is the consequence of such induced fracture on bottom hole flowing pressure (BHFP)? Does the CO2 flow will concentrate inside the fracture leading to propagation further and further of the TIF? To answer these questions, this paper presents an analytical solution of pressure at bottom hole with supposed constant hydraulic aperture of a TIF. The masse balance equation of CO2 flow with consideration of leak-off through fracture walls is solved explicitly. This solution enables us to assess the range of BHFP for various injection rate and fracture opening scenarios. Typically for an injection at 20 bpm, the BHFP could reach 310 bars. The maximum length of the fracture influenced by CO2 flow is affected by the assumptions made regarding the hydraulic aperture of the TIF and the characteristic time (τ) applied in the calculation of the leak-off coefficient. This range spans from 40 meters to 250 meters.
Integral System of Monitoring and Modeling for Rock Fragmentation and Blast Vibration
Authors: Yang R. 
Published: November 2023

Abstract
Most mines seek fine fragmentation for down-stream operations to maximize mineral abstraction with minimized energy cost. On the other hand, maintaining stable highwalls and undisturbed nearby community is highly desirable. To obtain fine fragmentation, it is often required to design blasts with favorable energy concentration through explosive loading or blasthole delay timing. Such blast designs have potential to cause high blast vibration in general. A blast optimization requires a desirable fragment size distribution as well as controlled blast vibration at concerned locations. To achieve the optimization, an integral system for accurate monitoring and reliable modeling of full blast design parameters for rock fragmentation and blast vibration is required. Current technology in the literature falls short for each of the needs. This paper presents an integral system, which includes three indispensable components for blast monitoring and modeling, which together complete a close loop of the needs for blast optimization.
Experimental Study and 3D Numerical Analysis of Wellbore Instability in Naturally Fractured Formations
Authors: Wei Yaoran , Li Xiaorong , Tan Zhenlai , Yang Tianyu , Su Feiyu , Feng Yongcun 
Published: November 2023

Abstract
Exploration and development of fractured formations is difficult, because complex conditions such as stuck pipe, wellbore collapse, and even the loss of borehole intervals occur frequently, causing huge economic losses and affecting the later drilling operations. However, most of the existing literature on wellbore stability analysis in fractured formations focuses on the coupled effects of fluid flow and deformation, and the impact of three-dimensional natural fracture characteristics (roughness, dip angle, etc.) on wellbore instability is not yet closely examined, which may yield significant errors and misleading predictions. This paper carried out a series of experiments to analyze the shale sample's fracture characteristics and shear strength. Then, a fully coupled 3D hydro-mechanical model was then constructed using the distinct element method (DEM) to investigate the wellbore instability. Finally, a comprehensive parametric study was performed to analyze the effects of characteristics of fractures (e.g., distribution density, surface roughness and associated shear strength, and dip angle) on wellbore stability under different in-situ stress states. The results show that the increase of the number of parallel weak surfaces results in a larger radial displacement around the wellbore. Fracture roughness poses an important impact on wellbore stability because larger fracture roughness is associated with higher rock shear strength. As the dip angle of the weak plane increases, the maximum wellbore displacement increases and then decreases, and the peak displacement occurs at the dip angle of 45°, which is more obvious in a normal fault stress regime. This research results provide a useful tool to understand and assess the effect of natural fracture characteristics on wellbore instability for drilling design in fractured formations.
Quantitative Prediction of Tectonic Fractures in the Fourth Member of the Leikoupo Formation in the Pengzhou Area, Sichuan Basin
Authors: Yang Xu , Bai Mingsheng , Xie Qiang , Li Gao , Shangguan Ziran 
Published: November 2023

Abstract
This paper aims to highlight the fracture characteristics of the fourth member of the Leikoupo Formation in the Pengzhou area. An anisotropic fracture density model considering the fracture attitude was established to predict tectonic fractures quantitatively. The results indicated that the maximum and minimum principal stresses experienced during the Himalayan Period were mainly concentrated in 120–150, and 85–100 MPa, respectively. The fracture strike can be grouped into NEE, NE, NWW, NW, nearly SN, and nearly EW trending. Three typical fracture development areas were determined: fault zone, anticline core, and others. The high value of vertical linear density was chiefly concentrated in the north and southwest of the study area and around the fault. The high value of the maximum horizontal linear density was primarily concentrated in the center of the study area. In addition, the vertical linear density of the anticline core was relatively low, but the horizontal density was relatively high, resulting in high gas productivity in these areas. Considering that the core area of the anticline included in the A-5 platform is the largest and the corresponding horizontal linear density is high, it is suggested that future wells be made in the A-5 platform.
Successful Pilot Deployment of Wellbore Strengthening Design Criteria and Quantification of Enhanced Fracture Gradient in a Depleted Reservoir in Malay Basin
Authors: Tan C. P. , Razak M. S. , Zakaria S. S. , Abitalhah A. , Zainudin W.N.S. Wan Mohd 
Published: November 2023

Abstract
Comprehensive large scale laboratory test data was used to develop fracture gradient enhancement technology for drilling mud compounds. Based on the laboratory test data, correlations were developed between optimum compound particle size against Young’s modulus of the rock and generated fracture width to maximise the wellbore strengthening performance of the compounds. In addition, Enhanced Fracture Gradient (EFG) concept and criteria were developed for the compounds to widen the stable mud weight window, and a niche workflow was developed for utilisation of the wellbore strengthening design criteria. The workflow was deployed and validated in the pilot deployment of the correlations and EFG criteria in two wells for drilling through depleted reservoir in Malay Basin. The EFG was predicted and incorporated into the mud weight programme and mud loss contingency plan of the wells. The wells were drilled with 10 ppb of the optimum mud compounds and the concentration was monitored and maintained throughout the drilling. In the first well, the maximum ECD exceeded the in-situ fracture gradient of the depleted reservoir by 1 ppg without any losses. Following TD of the hole section, an open-hole leak-off test was conducted which validated the predicted average EFG of 1.8 ppg above the in-situ fracture gradient. The predicted EFG was within 0.2-0.3 ppg from the open-hole leak-off test value. In the second well, the depleted reservoir was exposed to 0.6 ppg above the in-situ fracture gradient and no losses were observed. The successful deployment in the two wells validated the design criteria and guidelines for maximising wellbore strengthening performance of optimum mud compounds and the quantification of EFG for widening the stable mud weight window for safe and efficient drilling, especially in depleted reservoirs. The quantification of the wellbore strengthening and predicted EFG in advance enable their proactive incorporation into the well programme design and operation.
Fracture Morphology Evaluation of Surrogate Model for Fast Prediction Using Machine Learning
Authors: Hu Zhongyu , Sheng Mao , Wei Zhaoyang , Tian Shouceng , Zhou Jun , Hu Shimeng 
Published: November 2023

Abstract
Fracture morphology is the fundamental data to optimize hydraulic fracturing design. However, the physical modeling and simulation is time consuming involving data preparation, model parameter setting and validation, time-consuming running. Machine Learning (ML) methods have the potential to integrate multi-source data and enhance calculation efficiency, thus enable to be critically useful in fracture morphology prediction. This paper aims to create a ML-based surrogate model for quick fracture morphology prediction. The approach involves the numerical simulation of hydraulic fracturing in two blocks wells, the combination of geological and engineering parameters to be a dataset. Particularly, the pumping time-series data were integrated by encoding and the Conditional Generative Adversarial Networks were used to expand the samples in order to enhance the model's capabilities. Following this, the correlation and principal component analyses were used for the feature engineering to identify key factors for stimulation effectiveness and surrogate model inputs. The comparative analysis demonstrated the excellent predictive ability of the fused Recurrent Neural Network and Multi-Layer Perceptron model, reducing validation set errors by approximately 15%. This work demonstrates the feasibility of ML-based surrogate models for predicting fracture morphology, with the advantages of fast, efficient and integrated multi-source data.
Effect of H2 on Salt Caverns During Fast Cycling Injection-Production: Laboratory Characterization & Storage Integrity Workflow
Authors: Younes J. , Ghafouri S.M. H. S. , Grasselli G. 
Published: November 2023

Abstract
The expanding global population and clean energy demand suggests utilizing renewable energy from sources such as wind, solar, biomass, geothermal, hydro and biofuel. The intermittent nature of such sources has propelled a need for efficient storage. Hydrogen (H2), being a carbon-free energy carrier, emerged as a potential solution, but it will require large volume to be stored to meet the demand. Underground hydrogen storage (UHS) is preferred given its low cost, tightness, and safety. Although existing UHS facilities have safely operated for over 40 years, the expected demand growth will require frequent injection-withdrawal cycles. This review provides an examination of the processes involved during H2 cycling. Firstly, the different cyclic tests are classified based on loading path, frequency, type and environment conditions. Then the behavior of rock salt under cyclic loading is discussed. Detailed attention is given to the chemical interaction between H2 and salt, covering experimental research concerning UHS in salt caverns. The review ends by presenting a laboratory experimental workflow involving the coupled processes within UHS operations.
The Effect of T Stress on Rock Crack Initial Fracture Properties
Authors: Junyu Liu , Yan Su , Tianyu Zhang , Shuting Wang 
Published: November 2023

Abstract
The traditional fracture criterion ignores the influence of non-singular term parameters when analyzing the crack tip initiation characteristics of rock. The results of I-II mixed mode fracture experiment show that after ignoring the influence of T stress, the results of crack initiation angle obtained by traditional fracture theory are different from those of experimental results. In this paper, based on the scaled boundary finite element method (SBFEM), the singular parameters I and II stress intensity factors and T stress at the crack tip of composite rock are extracted. The traditional fracture criterion is modified by considering the non-singular parameter T stress. The initiation characteristics of rock under different crack forms are studied and compared with the existing experimental and theoretical results. The results show that the crack propagation will be intensified when the T stress is positive, and the crack propagation will be inhibited when the T stress is negative. It can be seen that the influence of the non-singular parameter of the crack tip, that is, the T stress, cannot be ignored.
Carbonate Formation Pressure Prediction Method Based on Machine Learning
Authors: Tao Zhenyu , Fan Honghai , Liu Yuhan , Zhou Fei , Chen Yiwei 
Published: November 2023

Abstract
Formation pore pressure is the pressure of fluid in the formation pore, which is an important parameter in oil and gas well engineering. It is related to the design of the well structure, drilling fluid density, and the supporting use of casing pipe. Accurate prediction of formation pore pressure contributes to achieving safe drilling. However, due to the complex geology of carbonate rock formation, it is difficult to predict. This paper presents a prediction method for carbonate formation pore pressure based on machine learning. This method first analyzes the causes of abnormal formation pore pressure in the Block X and selects the Fan comprehensive interpretation method and the grey correlation degree method as the theoretical basis to determine the correlation between formation pore pressure and different well-logs. Through the Back propagation neural network method, the relationship between formation pore pressure and well-logs is established, and the prediction results have higher accuracy than the original model. Compared with the measured data, the error is less than 5%, which meets the needs of engineering. Compared with traditional methods, this method has strong applicability and greatly improves the accuracy of prediction, which is suitable for the pressure prediction of multiple genesis in carbonate rock formation.
Assessing the Feasibility of Above Injection Zone Pressure Monitoring of CO2 Geologic Storage in the Williston Basin, North Dakota, USA
Authors: Chellal Hichem A. K. , Malki Mohammed Lamine , Egenhoff Sven 
Published: November 2023

Abstract
This study evaluates the feasibility of above injection zone pressure monitoring (AIZ pressure monitoring) in one of the Williston Basin CO2 storage projects. This approach relies on reservoir flow-geomechanics coupled simulations to predict the pressure response in the AIZ in the case of perfect seal and hypothetical scenarios where CO2 leakage occurs along the injector or nearby legacy wells. In this study the advantages and limitations of the pressure monitoring at AIZ were evaluated and we found that while this approach is capable of accurate and early detection of CO2 leakage, it is recommended to be implemented with other direct monitoring methods as it has its limitations as was seen in two simulation cases with low permeability leakage pathways that allowed CO2 to slowly migrate to the monitoring formation without causing significant pressure changes in this later which would make such leaks undetectable if pressure monitoring is the only monitoring technique implemented in the storage complex.
Relationship Between Geomechanical Properties and Rock Wetting Behavior
Authors: Isah Abubakar , Mahmoud Mohamed , Aljawad Murtada Saleh , Arif Muhammad , Kamal Muhammad Shahzad 
Published: November 2023

Abstract
Although geomechanical properties primarily relate to the structural aspects of rocks, while wettability is predominantly associated with surface properties, there can be a connection or interrelation between these two aspects. Rock mechanical properties, including unconfined compressive strength (UCS), surface hardness, Young's modulus, and Poisson's ratio, can be correlated to rock wettability via contact angle measurements through various interconnected mechanisms. This could be through fluid penetration and seepage which affect the ability of fluids to infiltrate the rock matrix. Moreover, mechanical properties are associated to porosity, permeability, and pore structure and connectivity of rocks which could also affect wettability. Overall, the relationship between geomechanical properties and wettability is intricate and requires comprehensive investigation. Therefore, in this work, we investigated the relationship between geomechanical properties and rock wettability via contact angle and Amott index. Both sandstone and carbonate samples were assessed. The contact angle measurements were conducted at reservoir temperature (353 K) and pressures (0.1 to 50 MPa) using drop shape analyzer, and the wettability results were compared with Amott tests under similar conditions. The findings indicate a correlation between the wetting behavior of the rocks, as measured by the contact angle, and its mechanical properties. Rocks with lower values of UCS, surface hardness, and Young's modulus tend to have higher values of Poisson's ratio, leading to lower contact angles and a more water-wet behavior, suggesting an interconnection between these properties. However, the Amott index does not indicate this relationship. In addition, increase in pressure causes a slight reduction in the contact angles observed in the oil/brine/rock systems. Thus, understanding the relationship between rock mechanical properties and wettability requires considering the combined influence of fluid penetration, and geomechanical and stress-induced effects. It is essential to integrate these factors to gain comprehensive insights into the complex behavior of fluid-rock interactions and its implications for various geological and engineering applications.
Analysis of the Impact of Continuous Ambulatory Peritoneal Dialysis on Nutritional Status in Pediatric Chronic Kidney Disease
Authors: Amirah Putri , Puspitasari Henny Adriani , Hafifah Cut Nurul 
Published: November 2023

Background: Chronic kidney disease (CKD) is a serious problem for all age groups, particularly in children. Several studies have shown that patients with CKD who underwent dialysis, including Continuous Ambulatory Peritoneal Dialysis (CAPD), experienced malnutrition, short stature and growth retardation. This study aimed to evaluate the correlation between the indicators of CAPD regiments with the nutritional status of pediatric patients with CKD and factors that influence it.
Method: We conducted a cross-sectional study by collecting secondary data from medical records such as disease stage and duration, the most recent CAPD regimen, etiology, and comorbidities. Data on nutritional status was then obtained by measuring body weight, height, and upper arm circumference. The measurement was then plotted using the WHO anthropometry application or the CDC growth chart. Demographic data such as the education level of father and mother, family economic status, age, and gender were obtained by filling out the Case Report Form (CRF).
Result: A total of fifteen respondents were included in this study. Children with CKD who underwent CAPD primarily had normal nutritional status with very short stature. Furthermore, no significant association was found between the CAPD regiments with the nutritional status of children with chronic kidney disease who are undergoing CAPD (p>0.05).
Conclusion: Children with CKD who underwent CAPD primarily had normal nutritional status with very short stature. There was no correlation between the parameters of CAPD regiments with the nutritional status of CKD patients who underwent CAPD. This indicates that the regiment used in this study is already quite satisfactory as it does not impact the nutritional status of those patients.
A grande coragem: abertura à alteridade a partir de Clarice Lispector e Martin Heidegger
Authors: Barbosa Caroline Garpelli , Grava João Paulo 
Published: November 2023

A apresentação de muitos dos temas recorrentes na obra de Clarice Lispector encontram ressonâncias com a ontologia-hermenêutica de Martin Heidegger, especialmente no que concerne à potência reveladora dos textos de Clarice em relação à condição humana. Assim, o presente texto desenvolverá uma análise do conto “As águas do mundo”, do livro Felicidade clandestina, em diálogo com alguns aspectos da obra filosófica de Heidegger, em particular, o encontro com a alteridade, a angústia e a experiência de estranheza. Consideramos que além do conto poder trazer à luz questões centrais presentes na obra do filósofo, os dois autores nos revelam a possibilidade do assombro diante do que parece óbvio e banal.
Palavras-chave: Heidegger, Martin, 1889-1976; Lispector, Clarice, 1920-1977; alteridade; angústia; condição humana.
ROGGHA SANGHᾹRA BHŪMI
Authors: Geria Anak Agung Gde Alit 
Published: November 2023

Teks Ronggha Sanghāra Bhumi, merupakan ajaran kepemimpinan (niti) dari Bhagawan Dharma Loka, yang diterima baginda raja Majapahit hingga di Bali. Teks berisi uraian tatkala bumi dalam keadaan kali yuga (sanghāra). Ditandai dengan kembalinya para dewata menuju alam surga (Mahameru). Digantikan atau dipenuhi sifat-sifat jahat (běbhutan) merasuk pada setiap pikiran manusia, sehingga dunia menjadi tidak menentu (roggha). Konflik (perang) berkepanjangan, di antara pemimpin (raja) saling hina dan bermusuhan, penyakit (sasab mrana) tiada hentinya, kematian mendadak dilanda muntaber, dan sejenisnya. Segala upaya pengobatan tradisional (usada) dan (japa mantra) telah dicoba namun tidak berhasil, wabah penyakit mendunia.
Merebaknya berbagai penyakit di seluruh penjuru dunia, adalah akibat dewata luhuring akasa murka sehingga banyak manusia mati tidak tertolong. Seorang raja (pemimpin) akan tertimpa bahaya, ditandai dengan adanya salah wtu (manakan salah), salah rupa, salah prilaku, kebenaran terabaikan, raja dilecehkan, raja berbuat sewenang-wenang hingga rakyat menjadi sakit hati, dan seterusnya, menjadikan dunia ini rusak/hancur (sanghāra). Keadaan yang mengerikan itu bisa teratasi dengan cara menepi, mengurung diri di rumah, karena běbhutan sedang bergerak (apan běbhutan sděng lumaku) merasuki manusia di jagat raya ini. Selain itu, manusia mesti senantiasa berdoa kepada Sang Pencipta, melakukan upacara yajña mamarisudha bhumi, menggelar upacara pacaruan (menetralisir dunia beserta isinya) secara menyeluruh berlandaskan rasa bakti yang tulus ikhlas mohon perlindungan-Nya.

Kata Kunci: roggha, sanghara, pamarisudha, dan yajña.
FEMININITIES AND MASCULINITIES OF THE MAIN CHARACTER IN STEVEN KNIGHT’S MOVIE “SPENCER”
Authors: Syahbana Lim Raveena Alsya , Gusti Ayu Made Rai Suarniti 
Published: November 2023

This research about Femininities and Masculinities of the Main Character in Steven Knight's Movie ―Spencer‖. The method which is used to collect the data is observation method and it is analyzed by qualitative method based on theory of value in which the theoretical concept is taken mainly from Connell's book entitled Masculinities (2005) which explained about the masculine theory in it and the book from Mahaney Feminine Appeal (2003) which explained the theory of femininity as a whole. Apart from that, there are other books as a reference for this theory, concepts regarding femininity and masculinity, which refer to behavior, gender, personality, and characteristics. Based on the data review, it can be found that the types of femininities and masculinities found in the data source are four for femininities and four for masculinities, the femininities consist of the mother and spouse, the hetaira, the amazon, and the medial women. Furthermore, masculinities consist of hegemonic, subordination, complexity, and marginalization. The film actors who were found to have types of femininities and masculinities were: Princess Lady Diana.