bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of Reclosable Fracturing Sleeves in Horizontal Wells in Changqing Oilfield
Authors: Xie Yonggang , Qi Yin , Liu Zhongneng , Ren Guofu , Luo Yougang , Zhang Huaguang 
Published: September 2023

Abstract
Different from hydraulic jetting fracturing technique and plug-and-perf fracturing technique, it is not necessary to perforate for fracturing using reclosable casing sliding sleeves, the wellbore is connected with reservoir through sleeves, and the opening and closing are controllable. The reclosable casing sleeve technique provides the possibility to enrich the fracturing mode in horizontal wells and also provides a technical means to solve the development contradiction such as water breakthrough.
The demand for reclosable casing sleeves is increasing in unconventional reservoir development. A new idea is to change the conventional fracturing sequence from toe to heel to skip fracturing to strengthen the stress interference between different stages, so as to create more complex three-dimensional fracture network and larger SRV. For waterflood development zone, especially the infill area with small well spacing, sleeves can be directly closed to save the well in case of fracturing fluid breakthrough and to realize water-out treatment during the production stage. In terms of production management, alternate production of the stimulated stages can be achieved.
In recent years, field tests of reclosable casing sleeves have been carried out in more than 10 horizontal wells in Ordos Basin unconventional reservoirs. This paper focuses on some typical application cases. Case 1 introduces a successful case of skip fracturing. According to the principle of complex fracture generated by stress interference, skip fracturing test is carried out, and successful experience is obtained in the process. Case 2 introduces a fracturing fluid breakthrough treatment with reclosable casing sleeves in a waterflood infill area. Breakthrough occurs during fracturing, resulting the connection between the fracturing stage and an injection well. The problem is solved by adjusting fracturing string and closing the sleeve, the subsequent stages are normally fractured, and an infill horizontal well is saved. Case 3 introduces a successful application of closing sleeves to treat high water-cut in a horizontal well after six months of production, which provides experience for treating water-out wells. Case 4 introduces the first successful case of the 28 reclosable casing sleeves + 3611.5m permanent optical fiber monitoring test outside casing in China. The success rate of sleeves is 89.3%, the real-time optical fiber monitoring signal is stable, and the operation is successfully completed.
The reclosable casing sleeve has a wide application prospect in enriching reservoir stimulation mode and well production management, but there are still many problems to be solved related to the sleeve and its application. There are both successful experiences and lessons in tests. This paper will share these with the peers, and promote the improvement and application of reclosable casing sleeve technique.
Extreme Well Condition Demands Customized Completion Design for Fracturing and Well Testing in HPHT Exploratory Well
Authors: Magrì R. , Repetto C. , Sacchini A. , Brambilla R. , Magna Detto Calcaterra S. , Carpineta G. 
Published: September 2023

Abstract
New and extreme challenges, from engineering and operational standpoints, were faced during the preparation and execution of an exploration well in an HPHT environment. COVID-19 pandemic outbreak made it even more challenging leading to several issues in terms of material deliverability and personnel availability.
The nature of the reservoir required hydraulic fracturing to be performed prior to test the explorative target. The entire fracturing treatment and well testing were performed through an instrumented well testing string which allowed to save rig time and, thus, costs.
This paper goes through the selection of proper completion and hydraulic fracturing technologies to withstand the challenges that such environment poses to deliver the job safely and timely.
The completion hardware selected to perform the job was a well test/frac string equipped with sensors, tester valve and circulating valve. A mechanical set down weight non-rotating packer isolated the reservoir from the annulus, a standard completion safety valve and a tubing hanger with X-Mas Tree completed the configuration of the DST string.
Another important aspect was the need of heavy brine (i.e. bromide based) which exposed the equipment and material to aggressive environment.
Hydraulic fracturing operations were carried out smoothly with the support of a dedicated frac vessel reaching up to 10,000 psi at wellhead and more than 12,000 psi at bottomhole.
The total amount of proppant pumped into formation was one of the highest in the Operator experience and good results were achieved in unknown formations. The result of the stimulation job was a good values of proppant concentration in the fracture as long as a good frac width.
During well testing operations high drawdown was reached without compromising the integrity of the string.
This paper outlines and describes the completion and fracturing job engineering, preparation and execution phases including all the mitigation actions and lessons learned gathered during operations.
Moreover, this experience showed how a resilient culture and an integrated approach between subsidiary operations and headquarter technical support, lead to successful operative results.
Slurry Acid Fracturing was First Ever Proposed to Unlock the Production Potential in Low Permeability Carbonate Reservoir in Central Iraq
Authors: Xiao Yong , Lu Lize , Zhang Jian , Mahmood Haider Qays , Sabir Hadeel Salahuddin , Wang Hehua , Li Xin , Wang Jian , Xu Tao , Mi Zhongrong , Kang Bo , Cheng Yi , Deng Yunhui , Huang Kai , Zhang Zhenghong 
Published: September 2023

Abstract
The low permeability carbonate reservoir in central Iraq was discovered in the 80's, facing the acid stimulation demand of shut-in well reactivation and new drilling well high-efficiency production. Low permeability, poor pore connectivity and non-ideal production necessitate the shift from conventional acidizing and pad fracturing to integrated multistage acid fracturing techniques, which achieve better fracture conductivity and deep penetration to maximize the production potential. Petro-physically speaking, effective porosity, net pay and hydrocarbon pore volume are related to reservoir performance. In this low permeability carbonate reservoir, previous acid stimulation analysis shows that the factors affecting production capacity are far more than those above mentioned. The injection parameters, surface etching and conductivity were lab-tested and evaluated among the four techniques of matrix acidizing, pad fracturing, alternating injection with acid and linear gel and proppant-slurry acid fracturing. The proppant-slurry acid fracturing was the first-ever proposed to unlock the production potential. Comparing to the conventional acid stimulation, the parameters including the proportion of crosslinked gel and acid, concentration, size and total volume of proppant, multistage injection volume and rate, retardance and closed acidizing, have been optimized and designed successfully for the first pilot well on-site.After the lab tests, geomechanics and modeling and parameter simulation of proppant-slurry acid fracturing, the results show that the stress difference between the perforated layer and the upper rock layers is about 5 MPa, the geometry of the artificial fractures can be controlled in between oil layers. Water-based guar gel fracturing fluid with additives and 20% concentration HCL with retarded agents were selected, the maximum pumping rate was designed as 6.0 m3/min with 6862 Psi pumping pressure, and the volume of acid was double of fracturing fluid. After the pumping of 20 m3 20/40 proppant with maximum concentration of 583 kg/m3 and 400 m3 acid, the evaluation results showed that the propped half-length Xf = 116.4 m width Wf = 0.7 cm, and dimensionless conductivity is 2.6. The predicted production was 2.5 times greater than before stimulation, and the artificial fracture was initiated in the pad stage, and then a finite conductive channel was formed by dual support of surface etching and proppant.Many technical and operational challenges were faced and properly handled with lab tests, numerical simulation and evaluation, which will form the completion and stimulation strategies for the low permeability carbonate reservoir. Four jobs have been confirmed for proppant-slurry acid fracturing.
A Dynamic Shift in Stimulation and Completion Strategy to Develop the Complex Mishrif Reservoir of Minagish Field, Western Kuwait
Authors: Al-Sabea S. , Patra M. , Ziyab K. , Abueida A. , Najaf A. , Al-Haddad M. , Bu-Mijdad M. M. , Salem A. , Peiwu L. , Pochetnyy V. , Almatroud N. , AlOthman F. 
Published: September 2023

Abstract
One of the most complex reservoir structures in Kuwait is the Mishrif reservoir in the Minagish field of western Kuwait. This depleted reservoir is composed of multiple heavily faulted compartments, each trending in different directions and with varying depth extensions. Earlier production was heavily dependent on these faults. Of late, a dynamic change in approach is under study to maximize the sustained oil production.
Recent findings from multiple openhole horizontal laterals crossing Mishrif using production logging tools and dynamic temperature survey enabled identification of some major faults as thief zones and not contributing to production. In extreme cases, mechanical isolation is necessary to overcome the losses and allow the well to produce. An openhole multistage completion (MSC) with extensive packer placement was deployed in a well in the central geographic area of the Mishrif crossing multiple faults and natural fractures. This was to study and to maximize the production potential after hydraulic acid fracturing. The combination of appropriate logging analysis, completion design, and hydraulic acid fracturing design were all key to the well production success.
The subject well is the first MSC with the faults mechanically isolated and the production relying on the fractures. All stages were completed in a record 5 days with multiple onsite decisions to control the fluid leakoff during the treatments. Due to the degradable balls with the MSC, milling operation was not required. The stabilized production result of approximately 800 BOPD achieved the target.
The dynamic changes in production over time can cause a complete shift in reservoir development strategy for the Mishrif reservoir. This is particularly due to the reservoir being highly faulted, complex, tight carbonate and highly depleted in nature. This paper describes the strategies used in multiple wells that led to a successful design and completion of the subject well.
YOLOv5-CE-DAFF: A polyp detection model based on CBAM-ECA attention mechanism and dropout-based adaptive feature fusion
Authors: Zhang Jiao , Zhang Qiming , Qiao Chen , Mei Zhandong , Ren Kai , Chen Jian 
Published: September 2023

Abstract
Colorectal cancer often develops from polyps, and timely detection and removal of polyps can effectively reduce colorectal cancer mortality. However, traditional medical imaging methods have low accuracy and slow detection speed, which cannot meet the requirements of practical use. For the above reasons, we propose a real-time polyp detection model called YOLOv5-CE-DAFF, which is based on the YOLOv5 model and incorporates the CBAM-ECA attention mechanism and dropout-based adaptive feature fusion. Firstly, to pay more attention to polyp features, we incorporate the CBAM-ECA attention module into the local cross-layer fusion structure. Secondly, we design an adaptive feature fusion of the prediction feature layer based on dropout, which increases the number of high-quality prediction boxes. Thirdly, we improve the positive and negative sample matching strategy to accelerate model convergence and improve detection accuracy. Additionally, we combine Soft-NMS and WBF to replace the original NMS algorithm, which retains as many high-quality prediction boxes as possible. The model proposed in this paper is tested on the colonoscopy dataset provided by Huashan Hospital. Numerical experiments show that YOLOv5-CE-DAFF has high detection accuracy and a low missed detection rate for colon polyps. Compared with the original YOLOv5 model, the proposed model significantly improves recognition accuracy and reduces missed detection rate.
Impact of advanced oxidation process (AOPs) pretreatment on enhancing sludge dewaterability: new insights through EPS protein and sludge hydrophilicity/hydrophobicity properties
Authors: Zhang Wei , Zhu Jing , Yang Xue , Dai Xiaohu 
Published: September 2023

Abstract
Advanced oxidation processes (AOPs) are important for improving sludge dewatering efficiency. In this study, AOPs such as pretreatment with sodium persulphate and calcium peroxide were investigated as methods for improving the dewaterability of waste activated sludge (raw sludge), digested sludge (DS), and sludge digested for 3 days (DS-3). The results showed that persulphate and peroxide could effectively improve the dewaterability of sludge. The results suggested that the maximum increment of free moisture of 4.69% was achieved for the DS-3 of pretreatment with persulphate, and the mechanism investigation revealed that AOPs pretreatment could enhance sludge floc disintegration, degrade the protein (PN) fraction of extracellular polymeric substances (EPS), and accelerate the release of mechanically bound moisture. Free moisture was significantly negatively correlated with the DS PN concentration in extra-microcolony polymers (R = 0.850, p < 0.01). Compared with RS, the organic matter content of DS and DS-3 sludge samples pretreated by AOPs was lower, viscosity was decreased, zeta potential was closer to zero, and the strength of amino, amide II and other hydrophilic functional groups decreased or disappeared. Under the same AOPs conditions, the dewateratbility of digested sludge is better than that of RS. This study reveals the mechanisms of sludge AOP conditioning and provides a theoretical basis for practical applications.
Efficient degradation of sulfamethoxazole by diatomite-supported hydroxyl-modified UIO-66 photocatalyst
Authors: Liu Huilai , Zhang Yu , Lv Xinxin , Cui Minshu , Cui Kangping , Dai Zhengliang , Wang Bei , Weerasooriya Rohan , Chen Xing 
Published: September 2023

Abstract
Sulfamethoxazole (SMX) is a widely used antibiotic to treat bacterial infections prevalent among humans and animals. SMX undergoes several transformation pathways in living organisms and external environments. Therefore, the development of efficient remediation methods for treating SMX and its metabolites is needed. We fabricated a photo-Fenton catalyst using UIO-66 (Zr) metal-organic framework (MOF) dispersed in diatomite by a single-step solvothermal method for hydroxylation (HO-UIO-66). The HO-UIO-66-0/DE assisted Fenton process shows SMX degradation at 94.7% efficiency; however, HO-UIO-66 (Zr) is not stable. We improved the stability of the catalyst by introducing a calcination step. The calcination temperature is critical to improving the catalytic efficiency of the composite (for example, designated as HO-UIO-66/DE-300 to denote hydroxylated UIO-66 dispersed in diatomite calcined at 300°C). The degradation of SMX by HO-UIO-66/DE-300 was 93.8% in 120 min with 4 mmol/L H2O2 at pH 3 under visible light radiation. The O1s XPS signatures signify the stability of the catalyst after repeated use for SMX degradation. The electron spin resonance spectral data suggests the role of h+, •OH, •O2-, and 1O2 in SMX degradation routes. The HO-UIO-66/DE-300 assisted Fenton process shows potential in degrading pharmaceutical products present in water and wastewater.
The Study Of Remazolam Combined With Sufentanil And Propofol On Painless Gastroscopy: A Randomized Controlled Trial.
Authors: Wu Xiaohong , Zeng Lin , Zhang Tianyao , Wu Wei , Tian Ying , dong Shuhua 
Published: September 2023

Abstract
Background
Gastroscopy is one of the most commonly used diagnostic modalities for upper gastrointestinal disorders. Remazolam besylate, a new type of ultra-short-acting benzodiazepine drug, has been less studied in gastroscopy. In this study, we studied the efficacy and safety of remazolam combined with propofol for painless gastroscopy.
Methods
This was a single-center, placebo-controlled randomized trial. One hundred patients undergoing painless gastroscopy were included in this study and randomly divided into two groups (n = 50 per group): the control group (Con group) and the remazolam group (Rem group). Sufentanil, remazolam, and propofol are used to anesthetize the patients, and then, the effects of different solutions on these patients are compared and analyzed. The patient's general condition, vital signs at different times, the dosage of propofol (mg) and additional times, complications, duration of gastroscopy (min), recovery time (min), residence time in the resuscitation room (min), and adverse reactions were recorded.
Results
Rem group SBP is more stable(P < 0.05); The number of additional propofol in Rem group was less(P < 0.05). The incidence of hypotension, bradycardia and dizziness was lower in Rem group, as well as the time of awakening and staying in the resuscitation room were shorter(P < 0.05).
Conclusion
Remazolam combined with sufentanil and propofol have less effect on hemodynamics in painless gastroscopy, and the patients have shorter awakening time.
Characteristics and risk assessment of water weight metal pollution in a mining area in Southern Hunan Province
Authors: Feng Li Jian , Feng Pan 
Published: September 2023

Abstract
We aimed to analyze the impact of tin mining and metallurgy on the water environment around a mining area. To achieve this, we selected pond water (n = 9), river water (n = 22), tailing dams (n = 4), and well water samples (n = 4) from a mining area in Hunan to analyze for major ions and heavy metals. Pond water, river water, tailings dam, and well water in the area were mainly of the Ca-Mg-HCO3 type, mainly controlled by rock weathering. The average ion content of the water bodies was highest in the tailing dam (12.01 mg/L), followed by the river (10.14 mg/L), well (9.71 mg/L), and pond waters (7.40 mg/L). Regarding heavy metal distribution concentration, arsenic (As), manganese (Mn), and zinc (Zn) made up the highest percentage of metal elements in ponds (81.86%) and river water (67.64%), tailings dams (87.61%), and well water (71.77%), respectively. Water quality indicators showed that the mean values of the single factor pollution index for each heavy metal element were ranked as mercury (Hg, 10.30 µg/L) > As (1.76 µg/L) > Mn (0.36 µg/L) > cadmium (Cd, 0.30µg/L) > copper (Cu, 0.16 µg/L) > iron (Fe, 0.12 µg/L) > Chromium (Cr, 0.07 µg/L) > tin (Sn, 0.04 µg/L ) > lead (Pb, 0.02 µg/L) ≈ Zinc (Zn, 0.02 µg/L). Combined multi-factor pollution index (Pn) > 0.7 µg/L for Hg and As in the water bodies and Pn < 0.7 µg/L for all other heavy metals indicate that Hg and As were the main elements polluting the water bodies. The overall pollution was controllable and not significant; controlling the pH in the acidic range could significantly reduce the water's ability to carry Hg. Correlation and principal component analyses showed that the PC1 variance contribution rate accumulated at 33.3%, and the main variables were (As, Hg, and Cu) and (Zn and Cd). Moreover, the PC2 variance contribution rate accumulated at 19.9%, and the main variables were Ti, Pb, Sn, and Mn, implying that the two groups of elements have homologous relationships or have common pollution sources.PCI variables mainly originated from mining areas and agricultural activities, and PC2 variables originated from mining areas, providing basic data and theoretical support for preventing and controlling heavy metal pollution in tin mining waters.
Differentiation of biologically functional peritoneal mesothelial cells from human induced pluripotent stem cells
Authors: Kato Tadashi , Yasuda Masahiro , Nakatsuka Ryusuke , Shirouzu Yasumasa , Fujioka Tatsuya , Hattori Fumiyuki , Taniyama Yoshihiro , Ogata Hiroaki , Sakashita Akiko , Honda Hirokazu , Hitomi Hirofumi 
Published: September 2023

Abstract
The peritoneum, which provides a slippery, nonadhesive, and protective surface for body cavities and internal organs, comprises peritoneal mesothelial cells (PMCs). Peritoneum is semipermeable, which makes it useful for performing peritoneal dialysis, but prolonged exposure to dialysate causes peritoneal adhesions. PMC replenishment could help treat adhesions in patients undergoing peritoneal dialysis; however, it is difficult to obtain a sufficient yields of PMCs to achieve this. Here, we developed a method for differentiating PMCs from human induced pluripotent stem cells (hiPSCs). The hiPSCs were initially differentiated to the intermediate lateral plate mesoderm (LPM) stage in the presence of FGF2 and BMP4. The LPM-stage cells were then differentiated into PMCs by activation of Wnt and retinoic acid signaling pathways and BMP inhibition. Expression of PMC markers verified correct cellular differentiation. Passaging of the induced PMCs (iPMCs) resulted in a uniform population of mature cells that were permeable to small molecules but only exhibited low permeability for large molecules. In addition, the iPMCs appeared to have regenerative and restorative properties. These findings suggest that iPMCs could help study human peritoneal function and be used for cell therapy in patients undergoing peritoneal dialysis.
Propagating insulator-to-metal transition in the wake of photoinduced strain waves in a Mott material
Authors: Amano Tatsuya , Babich Danylo , Mandal Ritwika , Guzman-Brambila Julio , Volte Alix , Trzop Elzbieta , Servol Marina , Pastor Ernest , Alashoor Maryam , Larsson Jörgen , Jurgilaitis Andrius , Pham Van-Thai , Kroon David , Ekström John Carl , Ahn Byungnam , Mariette Céline , Levantino Matteo , Kozhaev Mickael , Tranchant Julien , Corraze Benoît , Cario Laurent , Phuoc Vinh Ta , Sopracase Rodolphe , Grau Mathieu , Itoh Hirotake , Kawakami Yohei , Nakamura Yuto , Kishida Hideo , Cailleau Hervé , Lorenc Maciej , Iwai Shinichiro , Janod Etienne 
Published: September 2023

Abstract

Ultrafast physics opens new avenues for directing materials to different functional macroscopic states on non-thermal dynamical pathways. In any phase transition involving volume and/or ferroelastic deformation, an often overlooked mechanism emerges whereby photoinduced elastic waves drive the transition. However, a comprehensive physical picture of transformation dynamics which includes acoustic scale propagation remained elusive. Here we show that such a strain wave mechanism drives the ultrafast insulator-to-metal phase transition (IMT) in the V2O3 Mott material. We discuss the underlying physics based on time-resolved optical reflectivity and X-ray diffraction probing granular thin films. We evidence the role of strain wave mechanisms in ultrafast changes either with or without symmetry breaking. We reveal inverse ferroelastic shear occurring before the IMT propagating in the wake of compressive strain wave. These dynamics are shown to be governed by the domain size and the film thickness, respectively. A fluence threshold is evidenced for the onset of IMT at macroscopic scale, as well as phase separation at intermediate fluence and complete transformation at saturating fluence. We clarify the morphological conditions for the ultrafast IMT that is favoured in granular thin films, and hindered in single crystals. The resulting physical picture shed new light on ultrafast phase transitions in quantum materials and future devices based ond Mott insulators.