bluuebunny/crossref_metadata_2025_split huggingface dataset:
John Erskine z Carnock (1695–1768) — adwokat, profesor Uniwersytetu w Edynburgu, pisarz instytucjonalny
Authors: Szymura Mateusz 
Published: November 2021

John Erskine of Carnock (1695–1768) — jurist, professor at the University of Edinburgh, institutional writer
The article is an attempt to describe John Erskine — a Scottish advocate, the second person to hold the chair of Scottish law at the University of Edinburgh, and an institutional writer. The author of An Institute and Principles largely abandoned the comparative approach of his predecessors in favour of a systematic interpretation of Scottish law enriched with scholarly reflection on its nature, whilst taking into proper account the current state of Scottish case law. Erskine’s works have not only provided a foundation for the education of many generations of Scottish jurists, but having found recognition in the eyes of Scottish jurisprudence, they have secured for themselves the status of a subsidiary source of law, and for their author, a great deal of respectability.
John Erskine von Carnock (1695–1768) — Rechtsanwalt, Professor an der Universität Edinburgh, institutioneller Schreiber
Gegenstand des Beitrags ist der Versuch die Gestalt von John Erskine zu schildern. Er war schottischer Rechtsanwalt, zweite Person, die den Posten des Professors für schottisches Recht an der Universität Edinburgh bekleidete und zugleich ein institutioneller Schreiber. Der Verfasser von Institutionen und Grundsätzen verzichtete überwiegend auf die komparatistische Auffassung seiner Vorgänger zugunsten des systematischen Vortrages des schottischen Rechts, bereichert um wissenschaftliche Reflexion seinen Charakter betreffend, unter gleichzeitiger Berücksichtigung des aktuellen Standes der schottischen Rechtsprechung. Die Werke von Erskine stellten nicht nur ein Fundament der Edukation vieler Generationen schottischer Juristen dar, aber nachdem sie durch die schottische Jurisprudenz anerkannt wurden, sicherten sie sich auch den Status einer subsidiären Rechtsquelle, und dem Autor dieser Werke — großen Respekt.
Investigation on Hydraulic Fracturing and Cutting Roof Pressure Relief Technology for Underground Mines: A Case Study
Authors: Chang Qingliang , Yao Xingjie , Wang Xiangyu , Yang Sen , Sun Yuantian 
Published: November 2021

Abstract
Using hydraulic fracturing for cutting roof pressure is a critical technology to protect coal pillars. In this paper, based on the engineering background of 18506 working face in the Xiqu Coal Mine, using the methods of theoretical analysis, numerical simulation, and field measurement, a reasonable coal pillar width and practical parameters of hydraulic fracturing are given. The results show that roof cutting can significantly increase the stress in goaf and relieve the advanced pressure of the working face. Taking 18506 working face as the research object, the industrial test is carried out, and the surrounding rock control scheme of hydraulic fracturing and roof cutting is put forward, the mine pressure monitoring results show that the auxiliary roadway of 18506 working face reaches a stable state within 20 days, the deformation and damage degree of roadway surrounding rock are small, and the integrity of surrounding rock is improved.
Fault Activation in Central Mongolia during the Holocene: Results of Study of the Mogod Earthquake Ruptures
Authors: Smekalin O.P. , Chipizubov A.V. 
Published: November 2021

Abstract
—In order to determine the seismotectonic activity of faults in the Holocene, we performed trench studies of the ruptures produced by the catastrophic Mogod earthquake (5 January 1967, M = 7.5–7.8, I0 = 9–10) in the junction zone of the N–S striking Hulzhin Gol fault and the NW striking Tullet fault. Paleoseismic interpretation of seismic-deformation sections and radiocarbon dating of the samples allowed determining the kinematics and obtaining, for the first time, the absolute ages of paleoevents preceding the Mogod earthquake. Analysis of the tectonic conditions for realization of earthquake sources has shed light on the complex structure of ruptures in the area of the Mogod earthquake epicenter, within which three segments differing in the displacement amplitudes and kinematics have been identified. The research data indicate the repeated activation of the Tulet and Hulzhin Gol faults in the Late Pleistocene–Holocene. The absolute age of the latest activation is 596–994 AD for the Tulet fault and 11,379–6235 BC for the Hulzhin Gol fault. The cumulative deformation from paleoearthquakes in the trench sections in the Tulet fault zone points to at least two displacements of thrust kinematics, with the latest of them having an amplitude of 2.8 m. The paleoearthquake in the Hulzhin Gol fault zone is characterized by the presence of lateral slip. The amplitudes of deformations attest to earlier earthquakes similar in energy to the 1967 Mogod event or even stronger in the fault node. The obtained data on the timing of these earthquakes and the amplitudes of the accompanying displacements made it possible to estimate slip rates along the faults: 0.2–0.3 m/kyr horizontal-slip rates on the Hulzhin Gol fault and 0.5–0.7 m/kyr vertical-slip rates on the Tulet fault.
The Pridoli (Silurian) Lithostratigraphy and Biostratigraphy of Gorny Altai
Authors: Sennikov N.V. , Novozhilova N.V. , Obut O.T. , Khabibulina R.A. 
Published: November 2021

Abstract
—The paper presents new data on the upper Silurian litho- and biostratigraphy of the Gorny Altai area. Sediments within this interval store a succession of taxonomically representative middle–upper Ludfordian, lower Pridoli, and Lower Devonian (Lochkovian–Pragian) conodont assemblages. The new fauna constraints made a basis for updated correlations of the local and regional stratigraphic units at the Silurian/Devonian boundary of Gorny Altai with the stages of the International Stratigraphic Chart. The correlation results reveal a mismatch between the boundaries of the local and regional Silurian units and the respective boundaries of stages in the International Stratigraphic Chart.
Some Features of Quantitative Analysis of Rock-Forming Minerals Using a JXA-8230 Electron Probe Microanalyzer
Authors: Lavrent’ev Yu.G. , Usova L.V. 
Published: November 2021

Abstract
—The basic software package of a JXA-8230 microanalyzer, like its predecessor JXA-8100, uses the long-established ZAF correction method (with some differences) for a quantitative analysis: Calculation of mass absorption coefficients is based on Chantler’s theoretical data. The core of this method is quantum-mechanical calculation of the cross section of the interaction between an X-ray photon and atomic electrons. This innovation has had a positive influence on the trueness of X-ray microanalysis. Control tests on specimens where the absorption effect is dominant have demonstrated that the results of this analysis are slightly lower (by less than 2%) independently of the matrix absorption interval in which the analytical line is located. As a consequence, the selection of comparison specimens becomes easier: It is sufficient that the specimen under study and the comparison specimen belong to the same isomorphic series and that the intensity of the analytical line of the comparison specimen allows for the measurement with the required accuracy.
Experimental Study for Establishing Metal-to-Metal Seal Evaluation Criteria for Tubular Connections in Thermal and HPHT Applications
Authors: Xie Jueren , Friesen Dale , Droessler Mark , Roth Tim , Xie Junfeng 
Published: November 2021

Abstract
Qualification of tubular connections is an important task in well completion design for thermal wells, which experience peak temperatures of 180°C to 350°C, as well as high pressure and high temperature (HPHT) wells, which experience peak temperatures up to 180°C and pressures greater than 70 MPa. Industry protocols (such as ISO/PAS 12835:2013 for thermal wells, and ISO 13679:2019 and API RP 5C5:2017 for HPHT wells) have been developed for the purposes of evaluating the structural integrity and sealability of premium connections. In recognition of the the time and capital expense associated with completing "product line validation" for a connection design per these standards for multiple physical configurations (i.e for combinations of various sizes, weights, and grades), industry is developing a hybrid approach that supplements results from physical qualification tests with numerical simulation, such as Finite Element Analysis (FEA). To facilitate numerical modeling, extensive research work has been performed recently (e.g. Xie, Matthew, and Hamilton (2016) and Xie and Matthew (2017)) to establish a constitutive relationship for evaluating metal-to-metal sealability. It was noted in previous studies that further experimental work is required to better understand connection sealing behavior, especially the effects of surface roughness and thread compounds.
This paper presents an experimental study with a series of small-scale metal-to-metal seal tests under various levels of seal contact stress and gas pressures representative of thermal and HPHT operational conditions. These tests incorporated the effects of surface roughness and thread compound. FEA was performed to model the stress conditions in the test specimens. Based on the experimental and analytical study, an updated metal-to-metal seal evaluation criterion with calibrated parameters is proposed for tubular connections used in thermal and HPHT applications.
Considerations for Analytical Qualification of Tubular Connections for Thermal and HPHT Wells
Authors: Xie Jueren 
Published: November 2021

Abstract
It is important to complete thermal and high-pressure/high-temperature (HPHT) wells with tubular connections that possess adequate structural integrity and sealing capacity under the severe load conditions typically experienced by these wells throughout their life cycle. Individual premium connection designs are required to be evaluated and qualified through physical tests to broadly adopted industry protocols, such as ISO/PAS 12835: 2013 for thermal wells that experience temperatures from 180°C to 350°C, and ISO 13679:2019 and API RP 5C5:2017 for HPHT wells which experience peak temperatures up to 180°C and pressures greater than 70 MPa. Recognizing the time and capital expenses associated with completing full-scale physical testing of product lines with multiple connection designs of different tubular diameter, weight, and grade, industry is developing a hybrid approach that supplements results from physical qualification tests with numerical/analytical simulation, such as Finite Element Analysis (FEA). The key challenges associated with analytical evaluation are the lack of evaluation criteria and suitable guidelines for analysis methodologies.
This paper provides a review of recent work related to the development of sealability evaluation criteria; and presents guidelines to facilitate performance evaluation of tubular connections in thermal and HPHT wells through advanced FEA. For thermal well applications, this paper presents a methodology for quantitative evaluation of sealability of casing connections, as a supplement to the determination of a biased test population using FEA following ISO/PAS 12835:2013 requirement. For HPHT wells, this paper presents considerations for analyzing various testing loads, such as Test Series A (internal and external pressure cycles), Test Series B (internal pressure with bending), Test Series C (thermal and mechanical cycles), and Limit Load Cases. Analysis examples with generic premium connections are presented to demonstrate the use of the proposed analysis methodologies.
The Influence of Formation Creeping on Wellbore Integrity
Authors: Zheng Danzhu , Miska Stefan Z. , Ozbayoglu Evren 
Published: November 2021

Abstract
Creep, the time-dependent deformation of rock, will increase the pressure applied on the interface between the cement and formation. The objective of this paper is to study the influence of the formation creeping effect on the cement sheath integrity and zonal isolation. It focuses on the failure behavior of the cement sheath in the long period after drilling. The paper also investigates the changing of mechanical properties of cement to avoid loss of zonal isolation.
The interface pressure between the cement and formation cannot be measured directly in the field, so it will be valuable to predict this pressure through alternative methods. A Casing-Cement -Formation System (CCFS) analytical model based on linear-elasticity and Cam-Clay plasticity model was built. The CCFS model includes four layers, casing layer-cement layer- plastic creeping layer and the formation layer. This plastic- transition layer is formed because of formation creeping. The axial stress and tangential stress distribution of the cement sheath were calculated by the CCFS model. The contact pressure between the cement sheath and formation was calculated. Mohr-Coulomb yielding criterion was applied to estimate failure behavior for the cement sheath.
Two case studies were performed with the new CCFS model and previous CCFS model that do not consider the formation creeping effect. The comparison between two models showed that without considering the formation creeping effect, we might underestimate failure of the cement sheath. The simulation result by our CCFS analytical model indicated that the creeping effect would make the interface between the casing and cement vulnerable to shear failure. We changed the Young's modulus and Poisson's ratio for the failed case to investigate the influence of mechanical properties of the cement material. The result showed that a lower Young's modulus and higher Poisson's ratio were preferred for improving zonal isolation.
Instead of pursuing how creeping happens, this paper accepts formation creeping as a fact in the whole life of the well. The geomechanical impacts of the plastic-creeping formation, although undetectable from the surface observations, may cause detrimental consequences to cement integrity.
Data-Driven Well Pad Development Performance Review: Focus on the Role of Liner Design on Well Performance
Authors: Izadi Hossein , Roostaei Morteza , Mahmoudi Mahdi , Hosseini Seyed Abolhassan , Soroush Mohammad , Rosi Giuseppe , Stevenson Jesse , Tuttle Aubrey , Sutton Colby , Leung Juliana , Fattahpour Vahidoddin 
Published: November 2021

Abstract
Steam Assisted Gravity Drainage (SAGD) is the dominant in-situ method for oil production in Western Canada. The current study analyzed the relative performance of various well-completion practices using data from 4,000 well pairs that were drilled over a decade. The data analysis provided a unique opportunity to find best operating practices. The scope of this paper is to review the performance of major thermal projects in Canada and investigating the effect of liner design and Flow Control Devices (FCDs) on well pair performance and development.
Cumulative oil production and cumulative steam oil ratio (cSOR) were used as the key metrics in comparing the well performance in a SAGD operation. However, to compare different pads and different projects, it was critical to normalize the data with geological variation, well length, well spacing, and with consideration to the well failure rate, remedial completion and re-drills. In this paper we review seven thermal projects of four key operators with almost 3,500 wells and 1,200 well pairs in operation as early as 1996. All geoscience, and production/injection data have been extracted from public databases and utilized to develop a data-driven model.
The reservoir thickness variation for each well was determined using available geoscience data, and through the development of a geological model based on the available core data and well logs. The model was used to define the drainage volume for each well pair, which in turn was used to assign a geological ranking to the well. The cumulative oil production and cSOR were then normalized with the geological ranking and the size of the net drainage volume. The number of well pairs in each pad and the cumulative pad production were normalized against the number of days in production and their relative decline, which allowed for comparison between pads within the same project, as well as pads from other projects. The cumulative production of the active pads in each project was used to compare the relative performance of different projects. Also, we separated the projects and wells based on their use of FCDs in the producer and injector to compare the relative performance of each technology in the field.
This paper is the initial phase of the study on the role of completion design on relative well and well pad performance. The results will help completion and production engineers to better understand the well pair and pad relative performance and how to normalize the oil production data against geological variation to compare performance.
Plug and Abandonment for Gas Wells: A Case Study from Baghjan Oilfield, India
Authors: Bharadwaj Rishabh , Kumari Bhavya , Patel Astha 
Published: November 2021

Abstract
The economic end of the life-cycle of a well is dynamic and it varies with the oil & gas market conditions and advances in extraction technologies. If production declines or the need for a workover arises, plugging and abandonment operations are followed. In case the wellsite has encountered accidental releases, systematic abandonment and remediation becomes even more crucial to avoid further environmental damage and capital investment. This paper analyzes the Baghjan oilfield blowout of the Assam-Arakan basin and provides abandonment practices for gas wells.
The mobile workover rig was stationed at the Baghjan Well-5 with the aim to plug the lower producing zone at 3871 m and complete the well in the upper Lakadong+Therria sand at a depth of 3739 m. Baghjan Gas Well No.5 blew during the temporary abandonment which was planned to mitigate the leakage in the wellhead. Improper depth for the placement of cement plug, failure to check the plug integrity, and shortcomings in the regular inspection of annular casing pressure led to the well control situation at the Baghjan gas well.
While pulling out the tubing conveyed perforation gun after perforating the Lakadong+Therria I+II sand, Shut-In Tubing Pressure of 4400 psi and 3900 psi Shut-In Casing Pressure was observed which indicated a leak in the Tubing Seal Assembly. The well was killed with a 9.76 lbm/gal sodium formate brine and in the middle of pulling the tubing, leakage in the W.F. Spool was identified which changed the priority of the operations. Therefore, a temporary abandonment operation was planned to mitigate the leakage problem in the primary and secondary seals, during which the well started flowing gas profusely after nipple-down of the blowout preventer. The shortcomings of the abandonment process can be conquered by the selection of an appropriate isolation material such as resin-based sealants or bismuth and thermite, which shall act as a primary barrier and provide enhanced zonal isolation. The isolation material should mitigate micro-fractures, minimize treatment volume and fluid loss, provide ample pumping time, and not degrade in the presence of wellbore fluids.
The study discusses resin-based sealants, cement slurry designs, advances in conventional, unconventional, and rigless abandonment techniques, and suggests the most efficient method for the temporary and permanent abandonment operations to avoid further such incidents in the oil and gas industry.
Collaborations Involving Malaysia Upstream Regulator to Enhance Decommissioning
Authors: Binti Abd Rahman Shazwina , Bin A Bakar M Nurzawani , Bin Zainai Ariff Irfan 
Published: November 2021

Abstract
This paper aims to share the collaboration efforts of Malaysia's governing body for Upstream oil & gas industry with various stakeholders to enhance decommissioning in Malaysia. By virtue of Section of the Petroleum Development Act 1974, Petroliam Nasional Berhad (PETRONAS) ("PETRONAS") is vested with the entire ownership in, and the exclusive rights, powers, liberties and privileges of exploring, exploiting, winning and obtaining petroleum lying onshore or offshore of Malaysia. MPM manages the decommissioning liabilities for all Upstream petroleum facilities in Malaysia, specifically to strategize, regulate, promote, and drive decommissioning execution that is safe, cost-effective and brings the best benefit to the environment. Due to the shift in the industry with uncertainties in the long-term crude oil prices, depleting reserves, and operating cost challenges, it has made this non-revenue generating activity unavoidable. Thus, it is crucial to drive down decommissioning costs while protecting the environment. To achieve this objective, one of the focused initiatives pursued by MPM is through collaborations with relevant stakeholders such as industry players, upstream operators, government bodies, and academia. Such collaborations were found to be the fastest way to develop innovative solutions whereby the collaborators work together to achieve a common goal. Collaborations were done through, among others, constant and systematic engagements, workshops, brainstorming sessions, etc. A notable example would be in 2017, MPM successfully entered into a Memorandum of Understanding ("MOUs") with the Department of Fisheries ("DOF"), Ministry of Agriculture and Fishery Industry on rigs-to-reef. In 2020, MPM had successfully conducted a series of virtual workshops to capture decommissioning enhancement areas and lessons learnt with Operators and decommissioning contractors based on real-life experiences and past projects in Malaysia. A total of 115 enhancements areas were captured for consideration. Beyond these two items, MPM had successfully collaborated with many other stakeholders related to decommissioning and will continue to explore more collaborations in the future to support decommissioning in Malaysia. Details of these collaborations will be shared as part of this presentation. There were great experiences and important lessons that PETRONAS had learnt from these collaborations. PETRONAS believes that the culture of sharing experiences and lessons learnt will be the epitome for Operators and Contractors to work safely, stimulate creativity and strive towards decommissioning cost compression for every decommissioning project.
A Value Focused Thinking Approach to Decommissioning Decision Making
Authors: Tung Aaron 
Published: November 2021

Abstract
Values are what stakeholders regard to be important to decisions (Kruglanski & Higgins 2007). How stakeholder prioritize, rank, balance, and trade-off values can have significant influence on their reasoning and evaluation of decommissioning outcomes and decisions. Stakeholder values can vary depending on various factors including religious beliefs, personal interests, and past experiences (Lechner et al., 2017). Value-focused thinking is a decision science theory developed by Keeney (1992) which builds upon the concept of varying stakeholder values. Keeney (1992) argues that the best decision is one that best reflects the actual values of stakeholders. which suggests that the acceptability of decommissioning decisions (full removal, partial removal, leave in-situ, rigs-to-reefs, etc.) by stakeholders will vary depending on the values of stakeholder in that particular context.
This paper explores the idea of value-focused thinking and derive implications for decommissioning decision-making. Overall, the research finding suggests that rather than basing a decommissioning decision solely on scientific evidence, there is also a need for the decommissioning decisions to be able to reflect the actual values of stakeholders in that particular context. The criteria and weightage of the adopted multi-criteria decision analysis tool, for example, should accurately represent the actual values of stakeholders, so as to enable the tool to produce outcomes and decisions that has a higher probability of stakeholder acceptance.