bluuebunny/crossref_metadata_2025 huggingface dataset:
La vecindad civil y los conflictos inter temporales en la ley de Derecho civil vasco = The Basque civil neighbourhood and the intertemporal conflicts in the Basque civil law
Authors: Magallon Elósegui Nerea
Published: October 2019

Resumen: A través de la Ley de Derecho civil vasco 5/2015 se crea la vecindad civil vasca lo que supone un cambio automático de ley aplicable de todos aquellos que tuvieran vecindad civil en alguno de los territorios de la Comunidad Autónoma del País Vasco. Su creación reaviva de nuevo el debate sobre la competencia entre las CCAA y el Estado en materia de resolución de conflictos de leyes internos; y al mismo tiempo comporta la potencial multiplicación de los problemas adheridos al conflicto móvil en materia sucesoria. En este trabajo se analizará en primer lugar la adecuación de la nueva vecindad civil a los parámetros constitucionales y, en segundo lugar, los problemas de Derecho intertemporal que origina; todo ello ilustrado con la Resolución de l a Dirección General de Registros el Notariado de 12 de junio de 2017 que proyecta esta nueva realidad sobre la práctica.Palabras clave: Derecho Interregional, conflictos internos, Ley de Derecho Civil vasco, vecindad civil vasca, art. 9.8 CC, conflicto móvil, sucesiones, legitimas y preterición.Abstract: Through the Basque Civil Law Act 5/2015 the Basque civil neighbourhood is created, which implies an automatic change of civil neighbourhood of all those who have a civil neighbourhood in one of the territories of the autonomous Community of the Basque Country. Its creation revives again the discussion on the competition between the CCAA and the State to respond to conflicts arising from interaction between various territorial legislative systems or internal conflicts. At the same time this creation involves the potential multiplication of the problems adhering to the mobile conflict in successions. This paper will first analyze the adequacy of the new civil neighbourhood to the constitutional parameters and, secondly, the problems of intertemporal law that originates, illustrated through the Resolution of the Directorate General of Registries The Notarized, of June 12, 2017, which projects this new reality on the practice.Keywords: Interregional law, internal conflicts, Basque.
El registro salarial: una simple obligación con una gran implicación
Authors: Blázquez Agudo Eva María
Published: October 2019

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Aimé Tapia González. Mujeres indígenas en defensa de la tierra
Authors: Teja Ciprian Agueda
Published: October 2019

Este artículo reseña: Aimé Tapia González. Mujeres indígenas en de­fensa de la tierra. Madrid: Ediciones Cátedra, 2018, 308 p.
Venous and Lung Thromboembolism in the Context of Lung Cancer: Clinical Manifestations, Risk Factors and Prognosis
Authors: Maia Rosana , Neves Inês , Morais António , Queiroga Henrique
Published: October 2019

Introduction: The relationship between cancer and thromboembolic events has been known for a long time. Lung and venous thromboembolism are frequent complications of lung cancer and its treatment, being a great cause of morbidity and mortality. We pretend to establish the relationship between lung and venous thromboembolism and lung cancer, describe patient characteristics and analyze the impact in the survival and prognosis.Material and Methods: It was a retrospective study. All research subjects were selected from lung cancer patients with a newly diagnosed lung and venous thromboembolism event admitted to Hospital S. João, between January 2008 and December 2013 and were followed until December 2014. Statistical analysis was performed with SPSS.Results: From the search, we obtained 113 patients. The majority was male, smokers or ex-smokers, and adenocarcinoma was the most frequent histologic type, being diagnosed mostly in advanced stages. We noticed that the median time between lung cancer diagnosis and lung venous thromboembolism was 2.9 months. In 24 patients (21.4%), the lung cancer diagnosis occurred after the lung and venous thromboembolism event and in 86 patients (76.8%), it occurred before the event. After a median follow up of 1.4 months, 107 (94.7%) patients died, 1 (0.9%) was lost to follow-up and 5 (4.4%) were still alive. The median survival rate was 1.5 months.Discussion: The diagnosis of lung and venous thromboembolism in patients with lung cancer is associated with bad prognosis. It occurs most frequently in patients with advanced disease, in the first months after lung cancer diagnosis and after beginning chemotherapy.Conclusion: Disease progression is an independent predictor with negative impact in overall survival.
Doença de Parkinson: Revisão Clínica e Atualização
Authors: Cabreira Verónica , Massano João
Published: October 2019

A doença de Parkinson é a segunda doença neurodegenerativa mais comum, tendo sido documentado um aumento significativo da sua prevalência nas últimas três décadas. A fisiopatologia da doença assenta numa interação genética-ambiente, estimando-se que cerca de 5% – 10% dos casos tenham causa genética monogénica. O diagnóstico é clínico, apoiado por investigação complementar adequada. Não dispomos ainda de uma forma de diagnosticar com certeza a doença de Parkinson in vivo, à exceção de testes genéticos em circunstâncias específicas, cuja utilidade é limitada a uma minoria de casos. Recentemente foram propostos novos critérios de diagnóstico, com o objetivo de melhorar a acuidade diagnóstica, com ênfase nas características que apontam para outras causas de parkinsonismo. As opções terapêuticas atualmente disponíveis são clinicamente úteis, pois têm a capacidade de melhorar os sintomas da doença e a qualidade de vida dos doentes. Após a introdução da levodopa, a estimulação cerebral profunda surgiu, mais recentemente, como a segunda intervenção terapêutica com importante impacto sintomático no tratamento desta doença. Os sintomas não motores e as complicações motoras são responsáveis por uma parte considerável da incapacidade na doença de Parkinson, pelo que devem ser identificados e tratados. A investigação científica atual foca-se na identificação de potenciais biomarcadores da doença, que permitam alcançar um diagnóstico certeiro e atempado, e na criação de terapêuticas mais eficazes, de modo a preencher as necessidades clínicas atualmente não satisfeitas. Este artigo apresenta uma revisão atualizada sobre a doença de Parkinson, guiando o leitor através dos conceitos mais atualizados nesta temática, de forma a permitir a sua aplicação na prática clínica diária.
Editorial
Authors: Lara José Edson
Published: October 2019

Prezado Leitor, É com imensa satisfação que oferecemos-lhe esta segunda Edição Extraordinária da Revista Gestão & Tecnologia. A primeira edição extraordinária, publicada em 2017, abordou o tema da Inovação Tecnológica. Esta Edição Especial aborda uma temática diversificada, publicando artigos procedentes de países do Oriente Médio, predominantemente do Irã.
Publicación científica en especialidades de Neurología y Psiquiatría en el Perú a través del SCImago Journal and Country Rank.
Authors: Atencio-Paulino Joel I. , Paucar-Huaman Waldir , Condor-Elizarbe Ivan R.
Published: October 2019

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KONSUMERISME PREWEDDING (Strategi Komunikasi Bisnis Industri Foto Prewedding)
Authors: Amanda Ariesta , Amanda Ariesta
Published: October 2019

Penelitian ini bertujuan untuk mengkritisi fenomena foto prewedding sebagai salah satu tren yang kini mempunyai massa. Penelitian ini menggunakan metode kualitatif dengan dengan didukung kajian literatur yang berlokasi di Yogyakarta. Data diperoleh melalui observasi dan wawancara dengan pelaku industri foto prewedding, pelaku prewedding, dan masyarakat. Analisis data yang dilakukan meliputi pengumpulan data, triangulasi, penyajian data, dan penarikan kesimpulan. Hasil penelitian ini menunjukkan bahwa kehadiran tren foto prewedding tidak terlepas dari pelebaran bisnis foto pernikahan. Para pelaku industry foto menawarkan media representasi yang mampu membentuk wujud kesempurnaan diri serta mampu memfasilitasi ruang privat dalam wujud foto prewedding dengan menggunakan strategi komunikasi bisnis untuk menarik massa. Mix strategi yang dilakukan yaitu dengan menggunakan media sosial sebagai pendukung dalam pemasaran foto prewedding. Perspektif ekonomi industri foto melihat pasangan calon pengantin sebagai komoditas. Foto prewedding mampu meleburkan kelas sosial dalam masyarakat dan merubah sistem nilai tradisional masyarakat dengan jalan memanipulasi perspektif dalam melihat dirinya dalam sebuah bingkai foto.
The Effect of Breadfruit Leaf Flour (Artocarpus altilis) on Number of Blood Cells And Correlation Between Cholesterol Blood and Meat of Tegal Ducks 10 Weeks Age
Authors: Tugiyanti Elly , Susanti Emmy
Published: October 2019

The purpose of this research was to know the effect of breadfruit leaves flour in feed to blood profile and correlation between cholesterol, HDL and LDL of blood with meat cholesterol of maleTegal duck of 10 weeks old. The material used was Day Old Duck of male Tegal duck  as much as 120 heads with experimental research methods and Completely Randomized Design (CRD). There were 6 treatments: feed without breadfruit leaf powder, feed + breadfruit flour 3% / kg feed, feed + breadfruit flour 6% / kg feed, feed + breadfruit flour 9% / kg feed, feed + flour breadfruit 12% / kg feed, and feed + breadfruit flour 15% / kg feed. Each treatment was repeated 5 times and each replication consisted of 4 ducks. The variables observed were the number of red blood cells, white blood cells, HDL, LDL, blood triglycerides, correlation between cholesterol, HDL and LDL blood with meat cholesterol of male Tegal duck of 10 weeks old.  The result of the analysis showed that the supplementation of breadfruit leaves has significant effect (P <0,05) on the number of red blood cells, white blood cells, HDL, and blood triglyceride. There is a positive correlation between blood cholesterol with duck meat cholesterol which given breadfruit leaf powder. This research can be concluded that the supplementation of breadfruit leaf powder (Artocarpus altilis) can increase the number of red blood cells, white blood cells, blood HDL level but lowers blood cholesterol and triglyceride blood of male Tegal duck of 10 weeks old. Cholesterol meat is affected by blood cholesterol with regression coefficient of 0.780941, influenced by LDL (r = 0.407849), but negatively affected by HDL (r = -0.47022).
In Vitro Evaluation of Hen Eggshells Addition in Rice Husk on Litter Properties
Authors: Afnan Rudi , Idana Danar Bias , Yani Ahmad
Published: October 2019

Abstract. Ammonium (NH3) is released from uric acid of chicken feces. Good management practices are required to depress ammonium concentration in a litter. Several research findings showed that application of CaCO3 (calcium carbonate) can decrease ammonium concentration in a litter. Eggshell as a by-product of hennery (hen stable) and hatchery is mainly constructed from CaCO3. This research aimed to evaluate the addition of hen eggshell powder at different concentration in litter on water content, pH, microorganism, and NH3 concentration of litter. Rice husk as litter material, hen eggshell powder at a concentration of 0%, 5%, 10%, and 15% and hen manure were thoroughly mixed. After 24 hours, the concentration of water content, pH, microorganisms amount and NH3 in each treatment were measured. This research was completely randomized designed with 3 repetitions. Results showed the progressive addition of hen eggshell powder in litter until 15% increased pH and decreased water content, number of microorganisms and NH3 concentration. The addition of 15% hen eggshell powder in litter revealed best litter properties.Keywords:  ammonium, hen eggshell, litter, pH, water content
Getting the Right Grip? How Understanding Electrophile Selectivity Profiles Could Illuminate Our Understanding of Redox Signaling
Authors: Long Marcus J. C. , Wang Lingxi , Aye Yimon
Published: October 2019

Significance: Electrophile signaling is coming into focus as a bona fide cell signaling mechanism. The electrophilic regulation occurs typically through a sensing event (i.e., labeling of a protein) and a signaling event (the labeling event having an effect of the proteins activity, association, etc.). Recent advances: Herein, we focus on the first step of this process, electrophile sensing. Electrophile sensing is typically a deceptively simple reaction between the thiol of a protein-cysteine, of which there are around 200,000 in the human proteome, and a Michael acceptor, of which there are numerous flavors, including enals and enones. Recent data overall paint a picture that despite being a simple chemical reaction, electrophile sensing is a discerning process, showing labeling preferences that are often not in line with reactivity of the electrophile. Critical issues: With a view to trying to decide what brings about highly electrophile-reactive protein-cysteines, and how reactive these sensors may be, we discuss aspects of the thermodynamics and kinetics of covalent/non-covalent binding. Data made available by several laboratories indicate that it is likely that specific proteins exhibit highly stereo- and chemoselective electrophile sensing, which we take as good evidence for recognition between the electrophile and the protein prior to forming a covalent bond. Future directions: We propose experiments that could help us gain a better and more quantitative understanding of the mechanisms through which sensing comes about. We further extoll the importance of performing more detailed experiments on labeling and trying to standardize the way we assess protein-specific electrophile sensing.We propose experiments that could help us gain a better and more quantitative understanding of the mechanisms through which sensing comes about. We further extoll the importance of performing more detailed experiments on labeling and trying to standardize the way we assess protein-specific electrophile sensing.
Traumatic Pediatric Quadriceps Rupture After Medial Patellofemoral Ligament Reconstruction
Authors: Cannamela Peter C. , Maak Travis G , Adeyemi Temitope F. , Aoki Stephen K.
Published: October 2019

Case:

A healthy 14-year-old boy, who presented with recurrent patellar instability, underwent medial patellofemoral ligament (MPFL) reconstruction. Four weeks following this operation, the patient slipped and fell while wearing his knee brace and was found to have sustained a quadriceps tendon rupture.

Conclusions:

We present a case of a rare, previously undescribed complication following an MPFL reconstruction in a young athlete. The etiology of this particular injury pattern may be due to a disruption of the vascular supply to the superior pole of the patella. Orthopaedic surgeons performing these reconstructions should be aware of this unusual complication.
Gestão Pública no Brasil, Conquistas Recentes e Dilemas Presentes
Authors: Levy Evelyn
Published: October 2019

Pensata escrita pela Prof. Evelyn Levy, coeditora da edição especial da APGS com a SBAP.
Implementation the Multilateral Wells With ICDs for Development of Formations With High Viscosity Oil and Underlying Water Zone
Authors: Sleptsov Dmitriy , Ishimov Ivan , Golovatskiy Yury , Mezhnova Natalia
Published: October 2019

Vertical wells drilling for development of viscous oil in formations with low oil saturated thickness and underlying water zone, usually has a poor economics due to fast water breakthrough (water coning). The wells with 300 - 400m horizontal sections with a dense placing are able to achieve high recovery factor, but have a limitations during drilling and completion and subsequent production management.

The paper discusses the results of pilot works on the multilateral well construction in a highly viscous oil field with underlying water. The well designed especially for development producing intervals of bobrikovsky formation, widespread in a Volga-Ural region of Russia.

Based on detailed 3D geological model of the reservoir a well with three laterals was designed, equipped with inflow control devices (ICD) with sliding sleeves to enable isolation of each wellbore. The well has high horizontal sweep efficiency with a possibility to fully manage the inflow from every lateral in case of water breakthrough.

Using while drilling the deep azimuthal resistivity measurement tool allowed placing the wellbores in the top of pay zone far from water contact. According to the LWD measurements, the proper ICDs parameters were determined before well completion in order to equalize the inflow profile of the horizontal section. A significant increase in productivity and cumulative oil production of multilaterals allow to reduce wells density and ensure economic efficiency, even despite the increase in costs compared to horizontal well.
Tight Oil Development in RN-Yuganskneftegas
Authors: Shabalin Maksim , Khabibullin Galiaskar , Suleymanov Eldar , Rodionova Inessa , Sergeychev Andrey , Kulbaeva Diana , Volkova Polina , Serbaeva Alina
Published: October 2019

This paper presents a way of tight oil development using horizontal wells with hydraulic fracturing and modified field development patterns.

In order to minimize risks of drilling and optimize development decisions we apply systematic complex approach including well data analysis (incl. special tests), seismic data, reservoir surveillance results and geology modeling based on lithofacial analysis followed by simulation study. The feature of this approach is that this workflow is carried out on an ongoing basis and adjusted to the new incoming data. Using Achimov and Tyumen formation as examples characterized by high lithofacial heterogeneity and complexity of technological indicator forecasting we presented approaches to design the development strategy based on scientific and engineering support and pilot data.
A New Page in Completion of Sidetrack Wells with Multistage Fracturing: The First Application of Cemented Ball Activated Frac Sleeves
Authors: Morauskas Robert G. , Koltypin Oleg A. , Matveev Dmitry N. , Nurtdinov Denis M. , Osipov Dmitry A. , Napolskikh Eugene A. , Simankovich Andrey Y. , Shahbazov Kamil R. , Protsenko Vladislav G.
Published: October 2019

In recent years, more attention has been turning towards the tight reservoirs. Therefore, completion configurations with multi-stage hydraulic fracturing take a special place in available technology toolbox.

The widely spread multistage hydrofracturing in sidetracks (with collar cementing) has the following technological flaws: a long well reconstruction cycle; restrictions related to placing annular packers; possible leakage of the cement collar; failure to reach the target depth with the liner due a multitude of elements involved.

Moreover, the current way of work organization and the current state of technology makes it hard to achieve shorter sidetracking and hydrofrackturing cycles without changing the completion design. To solve these problems, a fundamentally new approach was introduced - to combine the advantages of continuous cementing and ball activated MSHF completion systems.

One of the Russian companies has developed the equipment required. A number of stand tests were carried out after the manufacturing that confirmed the design feasibility.

During the project implementation, a risk assessment exercise was performed for drilling and completion jobs, as well as for the multi-stage hydraulic fracturing, whereupon risk mitigation and exclusion measures were identified. As a result, the cementing program was significantly revised, considering the special nature of the work ahead.

Based on the results of the project, wells with horizontal sidetracks and continuous cement completions for subsequent MSHF (not used before in the Company) were successfully reconstructed. Due to an integrated approach and close interaction of all stakeholders already at the early stage of equipment testing and prior to the project implementation, it was possible to successfully finalize the installation and cementing of the completion systems.

Subsequently, the successful completion job ensured uninterrupted MSHF operations in the cemented liner.
Managed Pressure Drilling Overcomes Drilling Challenges and Enhances Oil Production of Naturally Fractured Carbonate Reservoir of East Siberia
Authors: Kurbanov Vasif , Rotaru Anna , Gribanov Vasiliy , Bakhitov Rinat , Sidorov Yuliy
Published: October 2019

One of the main problems associated with drilling of the horizontal wells of high length under conditions of a low-porous carbonate fractured reservoir is catastrophic mud losses associated with zones of intense fracturing and cavernousness. The meeting of such zones leads to the risk of failure to achieve the project well length, which further negatively affects the reserves development. This article describes the technological, production, economic aspects of the introduction of managed pressure drilling (MPD).

Managed Pressure Drilling (MPD) is an adaptive drilling process used to precise control the annular pressure profile throughout the wellbore. While conventional drilling uses the hydrostatic pressure of the drilling mud to manage pressure in the well, MPD uses a combination of surface pressure, hydrostatic pressure of the mud and annular friction to balance the exposed formation pressure. Control of these parameters allows maintaining the pressure at the bottom of the well close to the reservoir pressure, thereby avoiding mud losses or inflow of formation fluid into the well.

Conventional drilling of highly fractured zone is accompanied with intensive mud losses. Over 50% of the drilled wells in the oilfield could not reach the final target. Average productivity index for short wells is 30% less than for those that reached planned horizontal length. Application of bridging agents and hi-vis pills partially allows to solve the problem, but negatively affects the productivity and cost of wells.

As part of pilot stage, managed pressure drilling was tested on the two well clusters. 5 wells out of 7 reached the project length. The increase in the starting oil rate was 30%. The loss of drilling mud has significantly decreased. The average mechanical rate of penetration increased by 7%. Despite the high cost of the MPD, the ability to control the well during drilling reduces the final cost of the well by minimizing the loss of oil required to prepare the drilling fluid. According to the analyzed wells, the average cost of a meter of penetration for MPD is 14% higher than with standard overbalance drilling. At the same time, the unit cost of drilling per one ton of oil flow rate decreased by 22%, which indicates the economic feasibility of the technology.

The paper presents a comprehensive analysis of the MPD, with an assessment of the impact on drilling performance (rate of penetration, mud loses), production characteristics of wells (starting production rate, productivity index) and economic effect (cost of 1m penetration).
Adaptable Drilling Fluid System Assisted in Successful Drilling of TAML 2 Nine-Hole Horizontal Well in Vankor Field
Authors: Lezin A. , Kharitonov A. , Seminikhin I. , Korsunov E. , Gassan A. , Tikhonov E. , Jadan G. , Stashko V. , Blagonadeshniy I. , Manikhin A. , Medvedev S.
Published: October 2019

Currently, part of the Eastern Siberia fields is transforming to the latest step of the extraction process by slowly depleting the payzone with intensive production and turning it into an unconventional resources oilfield. In such a case, formation drilling fluid quality is part of the initial plan. Traditional drilling methods with only one horizontal borehole no longer achieves targets in unconventional oil and gas production. Drilling multilateral wells captures all oil-bearing layers in the production target area, not just content from an edge formation from the perspective of conventional drilling. A non-damaging in-situ formation drilling fluid was developed for use in the Vankor oilfield, the top priority oilfield for Rosneft in Eastern Siberia. Production drilling was started in 2006 and a growing rate of drilling is increasing each year by up to 15-20%, which is the one of the largest across Russia. The paper fully describes the methods of drilling fluid selection, the evaluation of mud formulation, the laboratory study with cutting and cores, and the economic effects on the oilfield with drilling of multilateral sections in the Vankor oilfield.
First Use of Coagulant for Solids in the Drilling Fluid Crude Oil for Underbalanced Drilling in Russia
Authors: Averkin Vadim Nikolayevich , Krylov Andrey Valerievich , Ryabtsev Petr Leonidovich , Lukovkin Yury Valerievich
Published: October 2019

Oil-base drilling fluids provide considerable advantages, however they have a number of limitations mainly related to drilling fluid system contamination with drill solids and formation water. The primary objective is to remove solids from the drilling fluid during the first cycle of their entering into the system in the course of well lengthening. These solids are defined as the concentration of suspended particles. Current solids control equipment does not remove the generated drill cuttings due to the absence of the first stage of solids control – shale shakers; therefore the cuttings transform into fine solids and accumulate as colloidal particles causing the growth of the concentration of suspended particles and reducing reservoir drilling-in quality. To meet the requirement, i.e. quality reservoir drilling-in, it is necessary to ensure effective cuttings removal during the first cycle of their movement.

In 2018 Surgutneftegaz planned and performed field tests of the AKROS coagulant for solids (hereinafter – Coagulant) at the Talakanneft Field Office. The test results enabled conclusions on specific features of the Coagulant use in the drilling fluid – crude oil (hereinafter – crude oil) and identification of the potential for reservoir drilling-in optimization that may expand its applicability.

As part of the New Technological Solution Implementation Program at Surgutneftegaz fields, additional lab equipment was used to obtain extended data, enabling a new interpretation of multilateral well lengthening.

A lengthened multilateral well was drilled at a Surgutneftegaz field using the Coagulant.

Coagulant field test results enabled the following improvements in drilling performance indicators: –reduced torque;–reduced tool weight during pulling out;–improved transfer of load to drilling tool;–increased ROP;–reduced concentration of suspended particles;–removal of formation water from crude oil.

Results achieved on the concentration of suspended particles allow the transfer of crude oil to the following well/interval upon the completion of well lengthening or its injection into an oil reservoir with the minimum concentration of suspended particles. Crude oil treatment with the Coagulant will mitigate risks of heating elements failure, reduce the crude oil volume used for well lengthening, and ensure its reuse without additional replacements and/or dilutions.

The use of the Coagulant demonstrated the ability to reduce the swelling activity of anhydrite occurring in the producing formation when it comes in contact with water contained in the crude oil, making well lengthening operations more technological. Results of the Coagulant use enabled the development of field practices of its application and recommendations on crude oil properties control as well as performance of comparative analysis of the efficiency of solids content reduction and water phase de-emulsification in the crude oil.
First Shallow Kick-off with Push-the-Bit Rotary Steerable System, Sakhalin
Authors: Lebedeva Irina , Shakirova Anastasia , Bravkova Natalia , Famiev Robert , Valshin Oleg , Gaskov Dmitriy , Shakhova Anna , Sandy Adam , Marushkin Dmitry , Bochkarev Vladimir , Surmin Vladimir
Published: October 2019

This article provides the results of the first experience of running a wear resistant "push-the-bit" RSS (rotary-steerable system) for kicking-off at shallow depth in poorly consolidated sand formations.

According to the contractor's best practices, a shallow kick-off in sections with large diameters is performed using PDM (positive displacement motors) with a bent housing angle set up to at least 1.83 degrees. However, for wells in Odoptu field, which is located in the north of Sakhalin island, several specific features pose issues for the effective application of conventional directional drilling equipment to reach the geological targets.

A standard approach for drilling the 17 ½-in. section in Odoptu wells requires two runs:

Run1: A PDM with roller-cone bit are used to build the inclination from zero to 70-degrees in poorly consolidated sand formations

Run2: A conventional RSS with PDC (polycrystalline diamond composite) bit are used for drilling the tangent section.

The project team was challenged to reduce the well construction time by drilling this section in one run, however, there were technical concerns. Drilling with a PDM and roller-cone bit would not provide a high penetration rate in tangent section. Drilling with a conventional push-the-bit RSS might not provide the necessary DLS (dogleg severity) in the sandstone due to formation washouts. In addition, drilling in the sands exposes the drilling equipment to excessive erosion because of the high sand content in the drilling mud. Considering the average section length of 2000 to 3000 m of MD (measured depth), this wear could lead to damaging the costly drilling equipment breakdown and causing unplanned tripping operations.

The project team alongside the field operator decided to test a wear-resistant RSS for one typical well of the Odoptu-Sea field. As a result, the section was drilled in one run, achieving the planned DLS without any equipment erosive wear. In addition, the 17 ½-in. section of this well recorded the highest penetration rate of 58 m/h in the field. The implementation of a wear-resistant RSS saved 6 days of the total section time.
Effective Application of Metal Expandable Packer to Prevent Gas Migration Issues, Leaks of Gas and Fluids in Annulus, Well Integrity Problems
Authors: Lebedev Ivan , Gabdullin Aydar , Pogurets Valeriy , Novikov Sergey
Published: October 2019

This paper reflects the experience of applying modern technologies to prevent annualr gas migration, crossflows and pressures (ACP), well integrity assurance during the gas and gas condensate wells construction in South Tambeyskoye field.

South-Tambeyskoye gas condensate field is the largest in Western Siberia and the Arctic North of the Russian Federation. The development of this field is carried out by the JSC "Yamal LNG" (PSC "NOVATEK") - one of the worlds leading gas and gas condensate exploration & production companies with the participation of Total and CNPC. Proved and probable reserves of the field according to the international classification PRMS are estimated at 926 billion cubic meters of gas and 30 million tons of liquid hydrocarbons.

At the South Tambeyskoye field, several field trial works (FTW) were carried out to prevent ACP on 4 wells: –3 production wells on Valanzhinsky deposits with reservoir pressures up to 350 atm.–1 production well on Jurassic deposits with reservoir pressures up to 820 atm.

Technology effectiveness comparison to standard methods has been conducted based on field trial results. Based on objectives achieved using modern technology, field trial works considered succesfull.
Complex Approach for Gas Lift Wells Optimization for Orenburgskoe Field
Authors: Kapusta Eugene , Rymarenko Konstantin , Nukhaev Marat , Grishenko Sergey , Aitkaliev Galymzhan , Minin Daniil , Kabanov Vasily , Galkin Denis , Karamysheva Tatyana , Ulyanov Vladimir , Dadakin Nikita
Published: October 2019

At the moment in Russia, the gas-lift method of operation is becoming popular again not only because of the significant reduction in operating costs, ease of operation, but because of the involvement in the development of a large number of assets with oil rims. This paper describes an integrated approach to optimizing the operation of wells in the Orenburg oil and gas condensate field, which is characterized by the largest number of wells in Russia that are operated by gas lift. The paper describes traditional approaches to the gaslift well testing as well as a new approach to improve operational efficiency.
Sand Influence Analysis on ESP Operation in Salym Petroleum Development. Effective Methods and Procedures for Sand Protection
Authors: Shamkov Alexander , Gorlov Alexander
Published: October 2019

The current state of the Russian oil industry requires a scientific approach to optimizing the operation of electrical submersible pumps (ESPs) in harsh conditions. Most of the fields are at a late stage of development with high watercut and increasing amount of solid particles. At the new fields and new license areas the main share is made up of horizontal wells with multistage hydraulic fracturing, where sand removal from unconsolidated sandstone and proppant from the bottomhole zone of the well to the electrical submersible pump causes its serious damage and reduces the run life (Haiwen, 2019).

In many scientific papers mathematical models of the given process were described as well as the speed of wear of impellers and bearings surfaces as a result of influence of abrasive particles were defined in laboratory conditions.

At the same time, it is necessary to note insufficient elaboration of questions in estimation of derating rate of pump performance in high amount of mechanical impurities in field conditions, and as a result – the incorrect estimation of the period of effective and trouble-free operation of the submersible equipment.

The proposed researches, first of all, are directed on determination of the degree of influence of solid particles on impellers and diffusers of ESP, character and speed of wear inside an ESP, forecasting of optimum time of operation of ESP. Based on the example of Salym group of fields the analysis is offered, which can be adapted and applied at other fields.
Investigation of Asphaltenes Precipitation Under Immiscible Interaction of Reservoir Heavy Oil and Liquid Carbon Dioxide
Authors: Lobanov Alexey , Fedorovskiy Stanislav , Promzelev Ivan , Tikhomirov Yevgeny , Schekoldin Konstantin , Struchkov Ivan , Kovalenko Vyacheslav , Sergeev Georgy , Lipatnikova Ekaterina
Published: October 2019

A new method for assessing the stability of the asphaltene phase in reservoir fluids using a high-pressure microscope is presented. The new method is based on the observation of the asphaltene particles sedimentation in a vertically oriented sapphire cell. This determines the size of sedimentation particles, their number and sedimentation rate. Experimental results are used as input parameters for calculating solid particles sedimentation of using the Stokes law equation. It makes possible to calculate the density and weight percent of the solid phase, evaluate the aggregative and kinetic stability of the fluid with respect to solid particles depending on thermodynamic parameters (pressure, temperature, reagent concentration). The proposed method was tested in the single-contact study of high-viscosity reservoir oil and liquid carbon dioxide and was compared with the results of asphaltene precipitation gravimetric test. According to the results analysis, were conclusions about the applicability of the new method and the mechanism of asphaltenes precipitation in high-viscosity oil when it contact with carbon dioxide. It is shown that the combination of gravimetric and visual analyzes allows to investigate the asphaltenes precipitaion separately in two processes: reduction of pressure and vaporization of fluids. This makes it possible to assess the likelihood of formation and the effectiveness of reagents for combating solid deposits in the entire process chain of oil production. Concluded that the asphaltenes precipitation in the contact of carbon dioxide and high-viscosity oil occurs according to the complex mechanism and includes intensification due to a drop in oil viscosity and damping due to mass transfer between carbon dioxide and oil phases. From this, inhibitors selection criteria are derived and the using of deasphalted oil as a stabilizer of asphaltenes is proposed.
Evolution of Horizontal Wells Production Logging Using Markers
Authors: Basov Artem , Bukov Oleg , Lazutkin Dmitry , Olyunin Alexey , Kuznetsov Vadim , Ipatov Andrei , Shevchuk Taras , Saprykina Kseniya , Ovchinnikov Kirill , Novikov Igor
Published: October 2019

There has been an increased interest in horizontal wells production logging using markers due to objective difficulties not only in conducting geophysical production logging and data interpretation, but also because existing technologies provide bottom hole data only for a very short time period when the PLT complex is in the well. Marker technologies enable users to obtain data in a much larger volume and practically non-stop for several years without changing the well mode of operation. This in turn allows for analyzing the influence of many external factors on the horizontal well intervals operation.

This article presents the experience of marker technologies that were tested and implemented at Gazpromneft PJSC sites from 2016 to 2019, and is aimed at the systematization of objectives and requirements for the technology, as well as addressing important issues during the tendering procedures for the oil producing companies.
Efficiency Analysis of 30-Stage Fracturing in a Horizontal Well to Oil Rims Based on Through-Barrier Diagnostics
Authors: Nagimov Vener , Virt Vitaliy , Kosolapov Vladimir , Bakhitov Dmitry , Maslennikova Yulia , Spirina Liliya , Shigapov Ilnur
Published: October 2019

Cost-effective reservoir development of oil rims such as Novoportovskoe field requires improving of existing fracturing methods on a way to increase recovery factor. One of the approaches includes the implementation of special completion with renewable fracturing sleeves as well as increasing the number of fracture ports over horizontal wellbore (Belov and others, 2018). This allows to increase profitability from one side, but from the other side, considering the complexity of oil rims geology, this increases the risks of early gas and water breakthrough from the gas cap and water contact respectively via hydraulic fractures induced to untargeted intervals.

Generally, the efficiency of implemented well completion design is evaluated based on conventional production logging, however, high resolution and sensitive well diagnostics are required in case of a high number of fracture ports. An additional challenge is associated with diagnostics of flow in the reservoir behind the liner and completion components integrity evaluation such as packer and fracture sleeves. The better diagnostics is applied the more efficient production profile optimization can be done. The paper describes the through-barrier diagnostics concept and shows a case of the performed survey in a horizontal well to oil rim with 30-stage hydraulic fracturing based on through-barrier diagnostics. Two surveys were conducted: the first survey was done at an early stage of well production, then workover was performed based on the first survey results revealing several zones with high GOR and high water cut. The second survey was conducted after the workover. Additionally, the paper describes a novel method on high GOR and high WC zones identification from spectral acoustic data analysis based on machine learning.
Assessing Efficiency of Multiwell Retrospective Testing MRT in Analysis of Cross-Well Interference and Prediction of Formation and Bottom- Hole Pressure Dynamics
Authors: Aslanyan Artur , Ganiev Bulat , Lutfullin Azat , Shvydenko Maxim , Karimov Ildar , Gulyaev Danila , Krichevsky Vladimir , Farahova Rushana , Zinurov Linar
Published: October 2019

The paper describes the first use of Multiwell Retrospective Test (MRT) on the Devonian formation of the Romashkinskoye oil field.

The paper introduces the technology of MRT and describes the advantages in determining the interference of wells and formation pressure (4-7).

The field case cited in the article describes a specific implementation of an MRT, called "radial deconvolution," in which the central (tested) well is equipped with a bottomhole pressure gauge. As a result, the interference of the offset injection and production wells to the tested well is estimated, as well as the properties of the well and reservoir, taking into account the interference with the offset wells. One of the advantages of this technology is the ability to estimate formation pressure without shutting the well. In this research, a comparative test was performed, in which the reservoir pressure predicted by MRT was checked with a field test.
How not to fail during the Reservoir Test for Low Permeability Formation: Case Study
Authors: Kaipov Yermek , Tyatyushkin Sergey , Kulyatin Oleg , Lomukhin Alexander , Romashkin Sergey
Published: October 2019

This paper presents The Exploration Well test solution under high pressure and low permeability. The work shows a new approach to the qualitative and quantitative description of the low permeability horizons by conducting the well testing before and after hydraulic fracturing. To provide a high degree of reliability, safety and efficiency in terms of time and quality of the received information the special combination of high-tech downhole tools was used.

The previous experience of conducting the well testing in exploration wells at the Yamal-Nenets Autonomous Region showed difficulties due to the deep bedding, low permeability and abnormally high formation pressure.

These types of formations require conducting the hydraulic fracturing to obtain the commercial flow at surface. During the well test after the hydraulic fracturing in a low-permeable reservoir usually it is not possible to achieve infinitely-acting radial flow regime within the allocated time which does not allow to estimate the actual horizontal permeability of the formation.

To perform the complex well testing and effective hydraulic fracturing the combination of downhole tools, run-in hole on a tubing, including the perforating guns, packer, autonomous pressure gauges, downhole valves (tubing and circulation valves) controlled from the surface, was used.

To assess the reservoir permeability the well testing was carried out with the inflow period without natural flow to the surface and pressure build-up shut-in at the bottom before creating the hydraulic fracture. As a result, the formation pressure, permeability and skin-factor are estimated. During this study, a multi-cycle valve controlled with a low-pressure impulse in the annulus played the major role in conducting several inflow periods, pressure build-ups with downhole shut-in and lifting the formation fluid to the surface by reverse circulating through the circulation valve.

Before conducting the hydraulic fracturing, three mini-frac tests were carried out with injection of hydraulic fracturing fluid into the reservoir and recording the pressure fall-off with downhole shut-in. As a result of this period the fracture closure pressure, reservoir pressure, mobility and the effectiveness of fracturing fluid were estimated.

After hydraulic fracturing, flowing periods were conducted to assess the well productivity with a created fracture.

These well testing activities were carried out successfully in a safe manner and achieved reservoir evaluation objectives.

This article discusses the unique experience and lessons learned from conducting the well testing with hydraulic fracturing using high-tech downhole equipment to achieve the successful results in low permeability reservoirs.
Development of an Approach for the Numerical Analysis of Well Interference
Authors: Bukhmastova Svetlana , Fakhreeva Regina , Pityuk Yulia , Akhmerov Rustem , Efimov Dmitrii , Nadezhdin Oleg
Published: October 2019

Information about the interwell space allows one to solve a number of key production problems such as planning of geological and technical measures and enhancement of operating efficiency of wells. Due to the fact that this information is most often recovered from the interpretation models, one of the ways to obtain correct information is the analysis of well interference. It helps to obtain knowledge about the state of the reservoir, the degree of its heterogeneity and the presence of cracks and fractures.

The aim of the study is development of a comprehensive approach for the analysis of reservoir connectivity by identifying well interference based on the mutual accounting of pressure and flow-rate data of well field. In order to solve this problem, we developed programing modules based on the methods of Multivariate Linear Regression (MLR) and Capacity-Resistance Model Injector-Producer (CRMIP). The main advantages of these algorithms are their low cost, high speed of operation, and the absence of the need for knowledge about the location of wells in the field and the physical properties of the formation. The MLR method is based on the pressure analysis with the use of the multivariate linear regression equation. The outputs are the weighting coefficients of well interference. To solve the problem using the CRMIP method we require a history of injection and production, bottomhole pressure of the production wells. The CRMIP takes into account the equation of material balance. On the basis of these data and the solution of the optimization problem we determine the coefficients of well interference, time delay in system response, and productivity coefficients.

The programing modules were tested on various synthetic data in order to quantify the coefficients of well interference and to verify the predictive ability of the models. Good agreement of numerical results with baseline data is obtained. The analysis of the results of numerical simulation indicated that all the interference coefficients are defined correctly.
Selective Oil-Field Exploitation System Features with Horizontal Wells Multi-Stage Fracturing of Achimov Deposits in Case AHRP
Authors: Buzaev Anatolii , Akhmetov Aleksei , Osipenko Aleksey , Sherstoboev Evgenii
Published: October 2019

Achimovsky deposits of the North of Western Siberia are characterized by variability of the reservoir on lateral and in vertical directions that leads to increased development risk. A main objective of the paper is definition of an optimal development scheme of pilot project sector and to use the received results in creation of the systematic plan of studying and drilling of other perspective areas for decrease in geological risks and for eduction of CAPEX on drilling.

In this paper, creation of conceptual geological and hydrodynamic model of BU213 layer of the East Messoyakhsky field is described. Reservoir of achimovsky deposits is characterized by clinoform (lenticular) structure. An optimal development scheme is choosen by multivariant geological and simulation modeling. Number of wells, length of horizontal section, quantity of stages of multistage hydraulic fracturing, proppant volume were varied for choosing an optimal development scheme by multivariant geological and simulation modeling. The additional research of geomechanical parameters was performed; modeling of water-saturated BU212 layer is conducted to find reason of water-cut increasement on production wells, and obtained results were used to re-design fractures for the purposes of low-volume hydraulicfrac fracturing efficiency increasement.

This approach allowed selecting an optimal development scheme – maximization of produced oil with minimization of drilling costs. Pattern of horizontal wells with multistage hydraulic fractures (5 stages) is recomended. For removal of geological uncertainties different development scenarios were provided which allow operative change a designed well pattern depending on drilling result, well tests and wells productivity. At each stage of obtaining information geological and simulation models, updates are planned. That allows specifying probabilistic forecast of liquid, oil and gas production. After obtaining of results, phased drilling plan was generated and studying plan of other object BU213 deposits is approved.