bluuebunny/crossref_metadata_2025_split huggingface dataset:
Oil Production and CCUS Potential in La Luna Shale in Colombia
Authors: Herrera Tellez Claudia Marcela , Fragoso Alfonso , Aguilera Roberto 
Published: March 2023

AbstractLa Luna Shale in Colombia is the main source rock in the Middle Magdalena Valley (MMV) and the Catatumbo Basins. La Luna shale is a high-quality source rock and its potential has been investigated by several authors. This paper presents geological, geochemical, and petrophysical description of La Luna shale with the dual objective of (1) utilizing CO2 for improving oil recovery through Huff-n-Puff (HnP) gas injection, and (2) storing CO2 safely and without leaks.The overall approach includes verifying that geologic fluid containment exists in the shale reservoir. The present work shows that this is indeed the case in La Luna shale. Geologic containment is valuable as it permits maximizing oil recovery from La Luna shale and safe storage of CO2 with negligible possibilities of fluid leakage, thus providing a valuable contribution to solve problems related to climate change. Consequently, the procedure described in this paper conforms well to CCUS: Carbon capture, utilization and storage of CO2.The Eagle Ford shale in Texas is a good analog of La Luna shale. In both reservoirs, sedimentation and development of the source rock start at about the same time in the late Cretaceous, about 93 million years ago. It is not surprising then that in both Eagle Ford and La Luna shales, oil, condensate and natural gas are in the same location where they were generated, gas is at the bottom, condensate in the middle and crude oil at the top of the structure. Thus, the hydrocarbon fluids have been upside down or inverted position through millions of years. This constitutes geologic containment.The paper describes the following activities once geologic containment is established: (1) drill a pilot horizontal well (HW), (2) stimulate the HW with multi-stage hydraulic fractures and investigate the environmental impact (if the pilot is successful, drill another pilot(s)), (3) produce oil by primary means for a maximum of 2-3 years, (4) implement HnP CO2 injection, (5) store the CO2 in the shale reservoir once the HnP reaches economic limit. Regular pressure monitoring throughout the life of the HnP project guarantees the lack of leaks, a major concern when CO2 is stored in other types of depleted reservoirs or aquifers.The novelty of the paper is demonstrating geologic containment in La Luna shale in both the MMV and Catatumbo Basins of Colombia. This provides the basis for implementing CCUS. The geological, geochemical and petrophysical description allow to construct a simulation model to investigate primary recovery as well as EOR by HnP CO2 injection. CO2 can be stored safely, without leaks, in the shale reservoir once the HnP project reaches economic limit.
Using Advance Modelling Techniques to Design Diversion for Acidizing, Fracturing & Re-Fracturing
Authors: Omer Mohammed , Fragachan Francisco E. 
Published: March 2023

AbstractStimulation fluids injected into a reservoir generally take the path of least resistance, i.e., zones of high permeability where often the stimulation is not as important as other critical under-stimulated areas. This leads to under-stimulated zones, which negatively impacts the production, or over-stimulated zones, which might lead to softening of the wellbore rock and, with time, might have also a negative effect on production. The efficiency of a fracturing, acidizing, or re-fracturing treatment depends on maximizing its contact with the zone of interest and uniform distribution in the reservoir. To achieve this goal, existing fluid paths must be efficiently and temporarily blocked, therefore diverting the treatment towards under-stimulated areas, a process known as diversion. The main goal of diversion is to distribute the stimulation fluid across the reservoir uniformly.An analytical model based on computational fluid dynamics and discrete element modelling has been developed to optimize the different parameters that affect an optimum diversion. The parameters that effect the efficiency of plugging are flow rate, PSD (Particle Size Distribution), concentration, carrier fluid, and the displacement rate during diverter injection. The modelling can be customized depending upon the type of application.This paper will summarize an engineering workflow to optimize diversion design and present successful cases globally of biodegradable, bi-particulate diversion applications in matrix acidizing enabling a production increase of 140%, re-fracturing applications (which led to the formation of new fractures in the new zones not previously stimulated), and uniform fracture growth from horizontal wells.We believe that an engineering approach is critical to the success of matrix acidizing, fracturing, and re-fracturing. The results demonstrate the effectiveness of advance modelling and bi-particulate diverters in minimizing the formation damage, evenly distributing the stimulation fluid, and thereby increasing its effectiveness and retarding the softening of rock, and to enhance the production across the target zone. The lessons learned from various applications of these engineered bi-particulate diverters can be applied for stimulation design and planning
Fracture Identification and Classification Using the Resistivity Image Logs in Tight Conglomerate Reservoir: A Case Study from Junggar Basin
Authors: Meng Xin , Yang Zhen , Gao Jixin , Liu Bowen , Wei Leipeng , Zhang Xu , Liu Bo , Zhao Meng , Wang Wei , Delgado Paola 
Published: March 2023

Abstract
The conglomerate reservoir with a very low porosity and permeability is one of the most important reservoirs in Northwest China. The pay zones are very difficult to be identified in a conglomerate reservoir which is more than 200 meters thick, because there is no any clear positive response in the open-hole logs. It is challenging to evaluate this kind of tight reservoir using the traditional methods. Identifying and evaluating fracture zones in a fractured conglomerate reservoir were the objective of this case study. The high-resolution resistivity image logs were widely acquired on the key wells in this research area. Based on image interpretation and core calibration, a fracture quality evaluation method was proposed and applied in this conglomerate reservoir.
Traditionally, the natural fractures on wellbore resistivity image are divided into two types: conductive or resistive fracture depends on it is "white" or "dark". Typically, conductive fractures filled with mud are open fractures, while resistive fractures are half-open or sealed and filled entirely or partially with calcite cementations. Based on core observations and descriptions, the core images and wellbore images were well-matched. The fractures picked from wellbore images are all calibrated with the core images.
In this case study, the fractures were classified in three types: open, half-open, and sealed. The half-open fractures were mainly identified based on the angle between the fracture strike and maximum horizontal stress direction. The fractures were mainly resistive fractures in the study area.
Not all resistive fractures are sealed. They may be half-open when the fracture strike has a low angle with maximum horizontal stress. The test and production data validated the selection of formation "sweet spots" with good fracture quality and identified where stimulation of half-open fractures could improve production significantly. The production data showed that half-open fractures can be the target zone in tight conglomerate reservoirs.
Numerical Simulation of Proppant Transport in Complex Fracture Network
Authors: Aguirre Nilzon , Xiaodong Hu 
Published: March 2023

AbstractThe development of extensive networks of fractures, also known as complex fracturing, is necessary for improving performance in very low-permeability, mainly stress-isotropic rocks, particularly shales reservoirs. Proppant transport and placement in these fractures are significantly impacted by the combination of naturally occurring and hydraulically induced fractures, which results in a complex fracture network.In this study a three-dimensional hybrid CFD model combined with the kinetic theory of granular flow (KTGF) is used to investigate the effect of complex fractures in the transport and placement of proppant, the simulation was first validated with experimental data, then, the effects of size, velocity and fracturing fluid viscosity for a tortuous complex fracture is investigated.The simulation results matched well with the experimental data. According to the parametric analysis, smaller proppant size, and high fluid viscosity help in proppant transit into the secondary fracture and generate a larger effective propped area, the increase in velocity leads to proppants to be able to enter into the secondary fracture, whereas for smaller velocity the proppants stay in the main fracture. Additionally, tortuous complex fractures geometry led to more resistance opposite to the flow direction and make more difficult the proppant transport.This research helps to improve the hydraulic fracturing design for shale formations by extending our understanding of proppant transport in complex tortuous fracture systems using a hybrid CFD approach.
Investigation of the use of traditional and complementary medicine and non-medical practices in individuals with neuromusculoskeletal problems
Authors: Karaali Hayriye Kul , Cilga Göksel , ozcan ozlem 
Published: March 2023

Abstract
Background
The aim of this study is to determine the frequency of use, reasons for satisfaction and improvement in health after use of traditional and complementary medicine (TCM) and non-medical practices.
Methods
Patients and their relatives, aged 18 or above, who admitted to the hospital, were included to the study. The history of using the traditional and complementary practices of the participants was questioned.
Results
Of 305 volunteers, 191 (62.6%) individuals received at least one of the TCM and non-medical practices due to various health problems. 139 (72.8%) of them applied due to the neuromusculoskeletal system problems. The most preferred practices of the 139 participants were cupping therapy (43.8%), using herbal products (35.2%), using drugs without the advice of a physician (35.2%), and osteopathy (13.6%). 71.2% of the participants stated that their health status was better after these practices, 79.9% were satisfied with the practice, 69.8% stated that they could recommend these practices to other people and 51.1% stated that they have paid for these practices.
Conclusions
In our study, it was determined that TCM and non-medical practices were frequently preferred. Data we obtained indicate that the demand for TCM and non-medical practices will continue to increase and it has a potential value for health professionals. This situation also indicates that all healthcare professionals should increase their basic knowledge of TCM and non-medical practices.
Single-versus multi-tract mini percutaneous nephrolithotomy for renal stones in a solitary kidney: a propensity-matched study
Authors: Lei Yeci , Dou Shangwen , Yue Gaoyuanzhi , Zhu Huacai , Liu Bangfeng , Liu Yongda 
Published: March 2023

Abstract
Background: Mini percutaneous nephrolithotomy (mPNL) is recommended for renal stones in a solitary kidney due to its high stone-free rate (SFR), with acceptable complications. Aimed to compare the effectiveness and the safety of single-tract mPNL (SM) and multi-tract mPNL (MM) in these patients.
Methods: 176 patients with a solitary kidney who had undergone SM or MM from January 2013 to December 2020 had been retrospectivelyevaluated. The MM group had tractsranged from 2 to 3. Patient clinical characteristics and demographic information were used for propensity score matching (PSM). Both groups' perioperative outcomes, procedure numbers, and efficacy quotient (EQ) were evaluated. As a more objective indicator for stone removal, EQ was calculated by SFR, retreatment rate, and auxiliary procedure rate.
Results: The retreatment rate of the SM group was higher than the MM group (45.2% vs 21.4%, P=0.031). No statistical difference between the two groups in complication rate. The initial SFR of the MM group was significantly higher than that of the SM group in a subgroup with a cumulative stone diameter (CSD) range of 40-70 mm (58.8%vs15.4%, P=0.026). The MM group had a significantly lower retreatment rate than SM (23.5% vs 69.2%, P=0.025), showinga higher EQ (56.5% vs 34.8%) and fewer procedures (1.35±0.49 vs 1.77±0.44, P=0.023).
Conclusions: In the CSD 40-70mm subgroups,MM proved better EQ with an acceptable complication rate and fewer procedures. When the CSD ranges from 40-70mm, MM can be used as a preferred procedure for renal stones in a solitary kidney.
Trial registration:This study was retrospectively registered and approved by the Ethics Committee of the First Affilated Hospital of Guangzhou Medical University(2020 No.K-41)
The evolution of risk factors and recurrence pattern over time in hepatocellular carcinoma after local curative treatment
Authors: Ding Wenzhen , Wang Zhen , Wu Jiapeng , Cheng Zhigang , Han Zhi-yu , Liu Fang-yi , Yu Jie , Liang Ping 
Published: March 2023

Abstract
Background
The influence of risk factors on hepatocellular carcinoma (HCC) intrahepatic recurrence may be alterable over time.
Objective
To explore the evolution of risk factors and its correlation with recurrence pattern over time.
Methods
The information and treatment method of patients underwent laparoscopic hepatectomy (LH) or microwave ablation (MWA) with single 3-5cm HCC were collected to identify risk factors by Cox proportional hazard model. Then, Landmark test was used to analyze the evolution of factor influences from 6th to 36th months. Intrahepatic recurrence was classified into three types: local tumor progression + surgical margin recurrence (LTP + SMR), proximal intrahepatic recurrence (PIR), and distal intrahepatic recurrence (DIR) and recorded.
Results
From January 2010 to October 2019, 1207 patients from 12 hospitals were included with 38.7-month median follow-up. Multivariate analysis showed: male, cirrhosis, elevated alpha-fetoprotein (AFP) and MWA were risk factors for recurrence. Landmark test and recurrence pattern record show that: the influence of AFP manifested in the first 12 months after treatment (p < 0.05), during which LTP + SMR occurs frequently (69.0%, 29/42); the influence of treatment method manifested in the first 23 months (p < 0.05), and the proportion of PIR was higher than DIR in this period (54.0% vs 34.0%); male and cirrhosis had sustained influence on recurrence (p < 0.05) throughout the follow-up period, and the proportion of PIR was comparable to DIR (48.0% vs 47.2%) when short-term factors become ineffective.
Conclusion
The influence of risk factors on intrahepatic recurrence could evolve over time and recurrence pattern also changed with the evolution of risk factors.
Volatility swaps valuation under a modified risk-neutralized Heston model with a stochastic long-run variance level
Authors: He Xin-Jiang , Lin Sha 
Published: March 2023

We consider the pricing of discretely sampled volatility swaps under a modified Heston model, whose risk-neutralized volatility process contains a stochastic long-run variance level. We derive an analytical forward characteristic function under this model, which has never been presented in the literature before. Based on this, we further obtain an analytical pricing formula for volatility swaps which can guarantee the computational accuracy and efficiency. We also demonstrate the significant impact of the introduced stochastic long-run variance level on volatility swap prices with synthetic as well as calibrated parameters.

doi: 10.1017/S144618112200013X
A modification to the Schrödinger equation for broader bandwidth gravity-capillary waves on deep water with depth-uniform current
Authors: Halder Sourav , Dhar Dr. Asoke Kumar 
Published: March 2023

We derive a nonlinear Schrödinger equation for the propagation of the three-dimensional broader bandwidth gravity-capillary waves including the effect of depth-uniform current. In this derivation, the restriction of narrow bandwidth constraint is extended, so that this equation will be more appropriate for application to a realistic sea wave spectrum. From this equation, an instability condition is obtained and then instability regions in the perturbed wavenumber space for a uniform wave train are drawn, which are in good agreement with the exact numerical results. As it turns out, the corrections to the stability properties that occur at the fourth-order term arise from an interaction between the mean flow and the frequency-dispersion term. Since the frequency-dispersion term, in the absence of depth-uniform current, for pure capillary waves is of opposite sign for pure gravity waves, so too are the corrections to the instability properties.

doi: 10.1017/S1446181123000020
High-order explicit second derivative methods with strong stability properties based on Taylor series conditions
Authors: Moradi Afsaneh , Abdi Ali , Hojjati Gholamreza 
Published: March 2023

When faced with the task of solving hyperbolic partial differential equations (PDEs), high order, strong stability-preserving (SSP) time integration methods are often needed to ensure preservation of the nonlinear strong stability properties of spatial discretizations. Among such methods, SSP second derivative time-stepping schemes have been recently introduced and used for evolving hyperbolic PDEs. In previous works, coupling of forward Euler and a second derivative formulation led to sufficient conditions for a second derivative general linear method (SGLM), which preserve the strong stability properties of spatial discretizations. However, for such methods, the types of spatial discretizations that can be used are limited. In this paper, we use a formulation based on forward Euler and Taylor series conditions to extend the SSP SGLM framework. We investigate the construction of SSP second derivative diagonally implicit multistage integration methods (SDIMSIMs) as a subclass of SGLMs with order \(p=r=s\) and stage order \(q=p, p−1\) up to order eight, where r is the number of external stages and s is the number of internal stages of the method. Proposed methods are examined on some one-dimensional linear and nonlinear systems to verify their theoretical order, and show potential of these schemes in preserving some nonlinear stability properties such as positivity and total variation.

doi: 10.1017/S1446181122000128
A comparison of explicit Runge-Kutta methods
Authors: Walters Stephen J. , Turner Ross J. , Forbes Lawrence K. 
Published: March 2023

Recent higher-order explicit Runge–Kutta methods are compared with the classic fourth-order (RK4) method in long-term integration of both energy-conserving and lossy systems. By comparing quantity of function evaluations against accuracy for systems with and without known solutions, optimal methods are proposed. For a conservative system, we consider positional accuracy for Newtonian systems of two or three bodies and total angular momentum for a simplified Solar System model, over moderate astronomical timescales (tens of millions of years). For a nonconservative system, we investigate a relativistic two-body problem with gravitational wave emission. We find that methods of tenth and twelfth order consistently outperform lower-order methods for the systems considered here.

doi: 10.1017/S1446181122000141
A local projection stabilization for convection-diffusion-reaction equations using biorthogonal systems
Authors: Lamichhane Bishnu P. , Shaw-Carmody Jordan A. 
Published: March 2023

We consider a local projection stabilization based on biorthogonal systems for convection–diffusion–reaction differential equations with mixed boundary conditions. The approach based on biorthogonal systems is numerically more efficient than other existing approaches to obtain a uniform approximation for convection dominated problems. We prove optimal a priori error estimates for the proposed numerical technique. Numerical examples are presented to demonstrate the performance of the approach.

doi: 10.1017/S1446181123000019
Effects of the Implementation of Intelligent Technology for Hand Hygiene in Hospitals: Systematic Review and Meta-analysis
Authors: Zhang Yi , Chen Xiangping , Lao Yuewen , Qiu Xiaobin , Liu Kang , Zhuang Yiyu , Gong Xiaoyan , Wang Ping 
Published: March 2023

Background
The World Health Organization recommends regular hand hygiene monitoring and feedback to improve hand hygiene behaviors and health care–associated infection rates. Intelligent technologies for hand hygiene are increasingly being developed as alternative or supplemental monitoring approaches. However, there is insufficient evidence regarding the effect of this type of intervention, with conflicting results in the literature.

Objective
We conduct a systematic review and meta-analysis to evaluate the effects of using intelligent technology for hand hygiene in hospitals.

Methods
We searched 7 databases from inception to December 31, 2022. Two reviewers independently and blindly selected studies, extracted data, and assessed the risk of bias. A meta-analysis was performed using the RevMan 5.3 and STATA 15.1 software. Sensitivity and subgroup analyses were also conducted. Overall certainty of evidence was appraised using the Grading of Recommendations Assessment, Development, and Evaluation approach. The systematic review protocol was registered.

Results
The 36 studies comprised 2 randomized controlled trials and 34 quasi-experimental studies. The included intelligent technologies involved 5 functions: performance reminders，electronic counting and remote monitoring，data processing，feedback，and education. Compared with usual care, the intelligent technology intervention for hand hygiene improved health care workers’ hand hygiene compliance (risk ratio 1.56, 95% CI 1.47-1.66; P<.001), reduced health care–associated infection rates (risk ratio 0.25, 95% CI 0.19-0.33; P<.001), and was not associated with multidrug-resistant organism detection rates (risk ratio 0.53, 95% CI 0.27-1.04; P=.07). Three covariates, including publication year, study design, and intervention, were not factors of hand hygiene compliance or hospital-acquired infection rates analyzed by meta-regression. Sensitivity analysis showed stable results except for the pooled outcome of multidrug-resistant organism detection rates. The caliber of 3 pieces of evidence suggested a dearth of high-caliber research.

Conclusions
Intelligent technologies for hand hygiene play an integral role in hospital. However, low quality of evidence and important heterogeneity were observed. Larger clinical trials are required to evaluate the impact of intelligent technology on multidrug-resistant organism detection rates and other clinical outcomes.