bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on the optimal design of volume fracturing for shale gas based on evaluating the fracturing effect—A case study on the Zhao Tong shale gas demonstration zone in Sichuan, China
Authors: Lin Yongxue , Liu Shanyong , Gao Shuyang , Yuan Yuan , Wang Jia , Xia Siqi 
Published: December 2021

AbstractHydraulic fracturing is the key technology in the development of shale gas reservoirs, and it mainly adopts volume fracturing technology to communicate hydraulic fractures with natural fractures to increase the drainage area. In view of the difficulty in characterizing the complex fractures created by multistaged fracturing in horizontal shale gas wells and the immaturity of fracturing optimization design methods, this study first evaluated the stimulation effect of fracturing technology based on treatment data and microseismic data. Then, the fracture characteristics after frac were considered, and a post-frac simulation was studied based on the discrete fracture network (DFN) model and the microseismic monitoring data as constraints. Finally, from the simulation results, an optimal design method of volume fracturing for shale gas was proposed based on the evaluation of the frac effects. The National Shale Gas Demonstration Zone in Zhaotong, Sichuan Basin was used as an example to study the optimal frac design of shale gas wells. The results show that (1) after optimizing the design, the optimal interval range is 50–70 m, the liquid volume of a single stage is 1800–2200 m3, the amount of sand is 80 m~120 t, and the slurry rate is 10–12 m3/min. (2) Two different frac design schemes were implemented in two wells on the same platform, and the production of the optimized design scheme was 14.7% greater than the original scheme. Therefore, the frac optimization design based on evaluating the fracturing effect can better guide the development of subsequent shale gas wells in this area.
Numerical forward modelling of the overpressure build-up in the Cenozoic section of the Central Graben in the North Sea
Authors: Orozova-Bekkevold Ivanka , Petersen Thomas Guldborg 
Published: December 2021

AbstractOne of the most widespread hypotheses for the origin of the present-day overpressure in the shale Post-Chalk section in the North Sea is the very rapid sedimentation from Neogene to present day. We tested this hypothesis by the means of numerical forward finite elements modelling and successfully simulated the overpressure build-up during the Cenozoic filling of the North Sea with relatively simple model set-up. Our model shows that overpressure of approximately 28% above hydrostatic developed in the Neogene, while during the Quaternary, it reached up to 36% above hydrostatic. At present day, the predicted onset of overpressure starts at about 800–1000 m below seafloor, while the maximum (magnitude about 1.36 sg, i.e. 36% above the normal hydrostatic pressure) is at approximately 2100 m. This overpressure profile fits reasonably well with data from wells drilled in the Central Graben. The exact magnitude of the overpressure depends on the used assumptions, the model set-up and the values of the input parameters. Especially the dynamic interaction between high sedimentation rates, clay permeability and low horizontal pressure gradient seems to be a key factor in the efficiency of dewatering of saturated clays during burial. The results indicate that, the assumption of horizontal stress isotropy results in nearly no horizontal fluid flow, despite the same magnitude for the vertical and the horizontal permeability. In these conditions, the vertical permeability plays much bigger role than the horizontal one in the effective de-watering of the sediments during burial. Further investigation is needed to explore the role of horizontal pressure gradient in fluid migration in passive sedimentary basins.
Structural interpretation of High-resolution aeromagnetic data over the Dahomey basin, Nigeria: implications for hydrocarbon prospectivity
Authors: Okoro E. M , Onuoha K. M , Okeugo C. G , Dim C. I. P. 
Published: December 2021

AbstractThe renewed quest to boost Nigeria’s dwindling reserves through aggressive search for oil and gas deposits in Cretaceous sedimentary basins has re-ignited the need to re-evaluate the hydrocarbon potentials of the Dahomey Basin. Aeromagnetic data are a low-cost geophysical tool deployed in mapping regional basement structures and determination of basement depths and sedimentary thickness in frontier basin exploration. In this study, high-resolution aeromagnetic (HRAM) data covering the Dahomey Basin Nigeria have been interpreted to map the basement structural configuration and to identify mini-basins favorable for hydrocarbon prospectivity. The total magnetic intensity grid was reduced to the equator (RTE) and edge detection filters including first vertical derivative (FVD), total horizontal derivative (THDR), tilt derivative (TDR) and total horizontal derivative of upward continuation (THDR_UC)) were applied to the RTE grid to locate the edges and contacts of geological structures in the basin. Depth to magnetic sources were estimated using the source parameter imaging (SPI) method. Data interpretation results revealed shallow and deep-seated linear features trending in the NNE-SSW, NE-SW, NW-SE and WNW-ESE directions. The SPI map showed a rugged basement topography which depicted a horst-graben architecture on 2D forward models along some selected profiles. Two mini-basins ranging in basement depths between 4.5 – 6.3km were mapped offshore of the study area. It appears the offshore Dahomey Basin holds greater promises for hydrocarbon occurrence due to the presence of thicker succession of sedimentary deposits in the identified mini-basins.
Evaluation of anionic and non-ionic surfactant performance for Montney shale gas hydraulic fracturing fluids
Authors: Chee Sheau Chien , Hidayat Belladonna Maulianda , Mohshim Dzeti Farhah , Md Zain Zahidah , Chai Ivy Ching Hsia , Borhan Norazleenawati , Ismail Hasnol Hady , Adam Matt 
Published: December 2021

AbstractHydraulic fracturing is often used in unconventional shale reservoirs, and 50%–95% of the injected hydraulic fracturing fluid remains in the formation due to the capillary effect. This phenomenon has been observed in the Montney shale formation, Canada, where the flowback water recovery is generally less than 25%. Surfactant is one of the hydraulic fracturing fluid additives for reducing surface tension and capillary forces to facilitate water flowback recovery. Surfactant loss due to adsorption by the reservoir rocks reduces the chemical’s efficiency, and this causes water retention in the formation and reduces water flowback recovery. The compatibility of surfactant with reservoir rock is critical to minimize surfactant adsorption on the rock surface because this diminishes the primary function of the surfactant hydraulic fracturing fluid additive and to ensure cost-effectiveness. This study evaluates surfactant efficiency to improve flowback recovery for the Montney shale formation based on IFT, surface tension, and adsorption. This study evaluates surfactant performance and performs a fluid–fluid interaction experiment and fluid-rock compatibility investigation. Several commercial surfactants are screened for low interfacial tension and surface tension. Further analysis is carried out by evaluating the fluid-rock compatibility using the static soaking test at reservoir pressure and temperature. The pre-soaking and post-soaking test fluids were analyzed for water composition, liquid–liquid interfacial tension, surface tension, and pH. Results showed that the selected surfactant is a critical determiner of the hydraulic fracturing fluid performance. SOLOTERRA 938 is an anionic surfactant that has good compatibility with Montney shale formation. Unlike other non-ionic surfactants, SOLOTERRA 938 retains the interfacial tension and surface tension after seven days of interaction with reservoir rock. The interfacial tension remained unchanged at 0.1 mN/m. The surface tension decreased from 28.4 to 27.5 mN/m with air and from 21.7 to 20.8 mN/m with hydrocarbon because surfactant behavior changes with pH change. The surfactant concentration was measured using high-pressure liquid chromatography, and the loss was 12% after seven days of interaction with the reservoir rock (from 0.1 to 0.088wt%). The adsorption calculated based on the concentration volume showed a low value of between 0.43 and 0.97 mg/g rock.
Examination of behavior of lysine on methane (95%)–propane (5%) hydrate formation by the use of different impellers
Authors: Longinos Sotirios Nik. , Parlaktuna Mahmut 
Published: December 2021

AbstractHydrate formation characteristics and hydrodynamic behavior have been investigated for mixture of methane–propane hydrate formation with pure water and with the amino acid of lysine 1.5 wt% at 24.5 bars and 2 °C. There were total 12 experiments with full and no baffle estimating the induction time, rate of hydrate formation, hydrate productivity and power consumption. The outcomes showed that radial flow experiments with radial flow have better behavior compared to mixed flow ones due to better interaction between gas and liquid. Furthermore, lysine experiments formed hydrates more quickly compared to pure water experiments showing that lysine functions as promoter and not as inhibitor. RT experiments consume more energy compared to PBT ones, while induction time is always smaller in RT experiments compared to PBT ones.
State of the art of advanced spectral noise and high-precision temperature logging technology utilization in Iraqi oil fields: an integration approach to diagnose wells performance complications
Authors: Zeinalabideen Mohammed Jawad , Al-Hilali Mazin Mohlab , Savinkov Andrey 
Published: December 2021

AbstractIn this study, an integrated approach of advanced spectral noise and high-precision temperature logging with production logging tool was used for the understanding of leak detection, fluid cross-flow, flow below spinner threshold, packer failure, fluid channeling in patchy and bad cement bond behind the casing, flow quantification in complex SSD completion, production detection and quantification in recirculation intervals in deviated wells. Various case studies from Southern and Northern Iraqi oil fields have been presented in this paper.
Experimental investigation of chemical solutions effects on wettability alteration and interfacial tension reduction using nano-alkaline–surfactant fluid: an EOR application in carbonate reservoirs
Authors: Rajabi M. Sadegh , Moradi Rasoul , Mehrizadeh Masoud 
Published: December 2021

AbstractThe wettability preference of carbonate reservoirs is neutral-wet or oil-wet as the prevailing of hydrocarbon reserves that affects approximately half of the total production of hydrocarbons of the world. Therefore, due to surface wettability of carbonate rocks the notable fraction of oil is held inside their pores in comparison with sandstones. Since shifting the wettability preference toward water-wet system is of great interest, numerous components were used for this purpose. In this experimental research, the wettability alteration of dolomite surface by interacting with a novel nano-surfactant–alkaline fluid has been investigated in order to diminish its adhesion to crude oil droplets. The solutions were prepared by homogenous mixing of nanosilica particles with cetyl trimethyl ammonium bromide and sodium carbonate, respectively, as a cationic surfactant and alkaline agent. The maximum wettability alteration from oil-wet to water system was obtained by employing a mixture of nanoparticles in association with surfactant–alkaline. Then, the fluids were employed in core-surface from detached and attached forms to compare their interfacial effects on saturated thin sections by crude oil and to measure the wettability. In addition, the interfacial tension (IFT) between solutions and crude oil was investigated and the maximum IFT reduction was obtained from nano-surfactant. Finally, all chemical solutions were flooded to the dolomite plugs separately after water flooding in order to evaluate the maximum oil recovery factor acquired by nano-surfactant.
Nanoemulsion-based dissolving microneedle arrays for enhanced intradermal and transdermal delivery
Authors: Nasiri Muhammad Iqbal , Vora Lalitkumar K. , Ershaid Juhaina Abu , Peng Ke , Tekko Ismaiel A. , Donnelly Ryan F. 
Published: December 2021

AbstractThe development of dissolving microneedles (DMN) is one of the advanced technologies in transdermal drug delivery systems, which precisely deliver the drugs through a rapid dissolution of polymers after insertion into the skin. In this study, we fabricated nanoemulsion-loaded dissolving microneedle (DMN) arrays for intradermal and transdermal drug delivery. For this task, model drug (amphotericin B, AmB)-loaded nanoemulsion (NE) were prepared by the probe-sonication method. AmB-loaded-NE was prepared using Capmul MCM C-8 EP/NF, Tween® 80, poly(vinyl alcohol) (PVA-10 kDa), and poly (vinyl pyrrolidone) (PVP-360 kDa or K29/32) by using SpeedMixer™, followed by probe-sonication and evaluated for particle size and polydispersity index (PDI). Transmission electron microscopy (TEM) was also used to assess the particle size before and after DMN casting. AmB-NE embedded DMN arrays were found to be strong enough, revealed efficient skin insertion, and penetrated down to the fourth layer (depth ≈ 508 μm) of Parafilm M® (validated skin model). Ex vivo skin deposition experiments in full-thickness neonatal porcine demonstrated that after 24 h, AmB-NE-DMN arrays were able to deposit 111.05 ± 48.4 µg/patch AmB into the skin. At the same time, transdermal porcine skin permeation studies showed significantly higher permeability of AmB (29.60 ± 8.23 μg/patch) from AmB-NE-DMN compared to MN-free AmB-NE patches (5.0 ± 6.15 μg/patch) over 24 h. Antifungal studies of optimized AmB-NE-DMN, AmB-loaded discs and drug-free DMN against Candida albicans, confirmed the synergistic activity of Campul-MCM C-8, used in the nanoemulsion formulation. This study establishes that nanoemulsion based dissolving microneedle may serve as an efficient system for intradermal as well as transdermal drug delivery.
Graphical abstract
Political ideas of the network society: why digitalization research needs critical conceptual analysis
Authors: August Vincent 
Published: December 2021

AbstractIn this article, I argue for an interpretive approach to digitalization research that analyzes the concepts, narratives, and belief systems in digitalization debates. I illustrate this methodological proposal by assessing the spread of network ideas. Many political actors and digitalization researchers follow network ideas, e.g. by claiming that the rise of a network society must lead to network governance. In contrast to this narrative, I argue that there are multiple visions of the digital society, each of which follows a specific pattern of epistemology, social imaginary, and political proposals. These competing self-interpretations must be investigated by digitalization research in order to map and evaluate different pathways into a digital society. For doing so, critical conceptual analysis draws on political theory, critical conceptual history, and the sociology of knowledge. It offers two major benefits for digitalization research. Firstly, it provides a systematic overview of competing governance rationalities in the digital society, enabling a critical evaluation of their potentials and proposals. Secondly, it enhances the methodological rigor of digitalization research by reviewing the narratives researchers themselves tell. I substantiate these claims by analyzing and historicizing the above network narrative. Tracing it back to cybernetics, I show that it has been used multiple times in efforts to reshape the way we think about society and politics, including our concepts of subjectivity, power, and governance.
Pattern of Contracture and Recovery Following Ischaemia of the Upper Limb
Authors: SUNDARARAJ G. D. , MANI K. 
Published: December 2021

196 cases of Volkmann’s Ischaemic Contracture of the upper limb with well-established ischaemia are presented. In all cases tight external circumferential splintage was the primary factor. 59.2% of these patients had been initially treated by “bone setters”. 54.6% had fractures of the forearm; supracondylar fracture of the humerus was seen in 10.7% and 17.9% had no evidence of bone or joint injury. Different patterns of ischaemic contractures are recognised and the severity of the contracture is found to be related to the extent of paralysis. Sensory recovery occurs in a proximodistal direction even following total ischaemia and degeneration of the nerve. Motor recovery, however, does not seem to take place. Sensory recovery in the forearm proceeds rapidly in the first six months; thereafter it is less significant. However, the sensory recovery in the hand is significant only after more than twelve months. Since sensory recovery occurs even after total ischaemic degeneration of the nerve it is postulated that such nerves recover and regenerate in course of time.
Ischaemic Contracture of the Intrinsic Muscles of the Hands a Hazard of Physical Restraint
Authors: McLARDY-SMITH P. , BURGE P. D. , WATSON N. A. 
Published: December 2021

A case is described of bilateral ischaemic contracture of the intrinsic muscles of the hands, presenting in a mentally-disturbed patient one year after a reported period of immobilisation in a physical restraint device. Involvement of the deep thenar muscles and the interossei on the radial side of the hand can be explained by consideration of the anatomy of the deep palmar arch. Division of the tendons of the contracted interosseous muscles proximal to the metacarpophalangeal joints and release of the left first web improved hand function. Those who supervise the use of physical restraint devices should be aware of the risk of intrinsic muscle ischaemia and of the need for prompt diagnosis and treatment.
Trapezius Transfer for Paralysis of the Deltoid
Authors: KAREV AVNER 
Published: December 2021

A case of selective paralysis of shoulder muscles with its reconstructive procedure, is presented. The deltoid, infra- and supraspinatus paralysed, leaving one of the steering group of muscles around the shoulder—the subscapularis—intact, made the transfer of the trapezius to deltoid feasible, utilizing a modification of Saha's technique. An excellent result with full range of motion of the paralysed shoulder has been achieved.
Assessment of Thumb to Index Pulp to Pulp Pinch Grip Strengths
Authors: HOOK W. E. , STANLEY J. K. 
Published: December 2021

In this study of fifty men and women with normal hand function, the strength of thumb to index finger pulp to pulp pinch grip was assessed with the remaining fingers either flexed or extended. When the pinch grip was performed with the remaining fingers flexed the value was up to 92% higher than when the remaining fingers were extended. In future studies where thumb to index finger pinch grip is used as an objective test of function then the position of the remaining fingers must be defined to aid interpretation of the results.
Percutaneous Accessory Collateral Ligament Release in the of Treatment Proximal Interphalangeal Joint Flexion Contracture
Authors: STANLEY J. K. , JONES W. A. , LYNCH M. C. 
Published: December 2021

A percutaneous release or capsulo-ligamentous proximal interphalangeal joint contracture is described, the indications are outlined and the advantage over open releases are discussed. The results of a small pilot study are reported which we feel are comparable to the results of open techniques. The procedure in itself, however, merely allows operative correction to be achieved. Its maintenance depends upon a stringent post-operative rehabilitation regime.
A Review of Total Elbow Arthroplasty and an Early Assessment of the Liverpool Elbow Prosthesis
Authors: SOURMELIS S. G. , BURKE F. D. , VARIAN J. P. W. 
Published: December 2021

The elbow joint is frequently affected by rheumatoid arthritis causing pain and disability which limits the use of the upper limb. Excisional or interpositional arthroplasties of the elbow have failed to provide satisfactory results. The design of a total elbow prosthesis in the early 1970’s followed the principles and evolution of joint replacement in the lower limb. In this study twenty-two Liverpool elbow prostheses (non-constrained) in nineteen patients were reviewed with an average follow-up of 26.5 months. Postoperatively the arc of flexion-extension improved with no change in pronation-supination range. Pain was significantly improved postoperatively. Rheumatoid patients were very pleased, but patients with secondary osteoarthritis were less satisfied. Two prostheses became loose and three had deep infection and were removed. Five patients had postoperative symptoms of ulnar neuritis and in three the symptoms gradually resolved. Early results of total elbow arthroplasty are promising in carefully selected patients.
Kienböck’s Disease — Late Results by Non-Surgical Treatment
Authors: KRISTENSEN S. S. , THOMASSEN E. , CHRISTENSEN F. 
Published: December 2021

Two groups of patients with Kienböck’s disease were followed. Twenty-three wrists had been immobilised with plaster and twenty-six had no treatment. At follow up there was a marked improvement in both groups. Eighty-three percent of the wrists in the new treated group were pain free, or reported pain only on heavy work, and in the nontreated group this was valid for 77%. Examining X-rays at follow up we did not find a single wrist in which the lunate was normal or less deformed than at the time of diagnosis. In all forty-nine wrists the lunate was deformed and in 67% osteoarthrosis in the radiocarpal joint was evident. It is concluded, that Kienböck’s disease has a naturally benign course, the remaining symptoms at follow-up might be caused by osteoarthrosis and nothing seems to be gained by rigorous immobilisation. If pain persists efficient treatment must be based on surgical methods.
The Value of a Next Day Hand Injury Review Clinic
Authors: FINLAYSON B. J. , CROSS A. B. , SHALLEY M. J. , CHERRY R. J. 
Published: December 2021

A daily hand injury review clinic takes place at East Birmingham Hospital. The purpose of this study is to determine whether this clinic is beneficial in reducing the morbidity of neglected hand injuries, and to compare the running of the clinic with the original criteria laid down at its inception as a ‘once only’ screening clinic. We conclude that such a clinic is highly beneficial, and recommend that it should be standard practice in other hospitals.
Post Mastectomy Pain after Brachial Plexus Palsy: Metastases or Radiation Neuritis?
Authors: HOANG P. , FORD D. J. , BURKE F. D. 
Published: December 2021

Three patients have been reported who developed metastatic tumour within the neural tissue of the brachial plexus three years, four years and fourteen years respectively after treatment of breast carcinoma by simple mastectomy and postoperative radiotherapy. A fourth patient who developed bilateral upper limb paralysis after radiotherapy for a lymphoma is also reported. At exploration of the brachial plexus extensive fibrosis was present in all cases with metastases only diagnosed through biopsy of neural tissue. The clinical features and the role of surgery are discussed in the light of our experience and a review of available literature.
Cubital Canal Syndrome Due to Subanconeus Muscle
Authors: SUCHER E. , HERNESS D. 
Published: December 2021

A forty-nine-year-old patient, suffering from right cubital canal syndrome, was admitted for surgery. The diagnosis was established clinically and by subsequent electromyography. The factor producing pressure on the ulnar nerve was the subanconeus muscle, an auxiliary extension of the medial portion of the triceps muscle, arising from the medial border of the olecranon and adjacent triceps tendon and inserting into the dorsal aspect of the medial epicondyle. Complete excision of this muscle is sufficient, leading to immediate improvement in most cases.