Expanding the Capabilities of Modern Wireline Formation Testers for Understanding the Structure of Tight and Fractured Suprasalt Carbonate Field in West Kazakhstan

2021 ◽  
Author(s):  
Vladislav Blinov ◽  
JIN Shutang ◽  
Samat Ramatullayev ◽  
Anton Filimonov ◽  
Muratbek Zhabagenov ◽  
...  
Keyword(s):  
Pore Space ◽  
Complex Structure ◽  
Well Logging ◽  
High Tech ◽  
Unique Approach ◽  
Complex Fluid ◽  
West Kazakhstan ◽  
New Perspective ◽  
Exploration Well ◽  
Fluid Inflow

Abstract Low porosity carbonate reservoirs of the Carboniferous and Devonian periods of the Caspian Basin in Western Kazakhstan are challenging to characterize using traditional well logging methods due to the complex structure of the pore space, which necessitates lengthy and sometimes ineffective production well tests. Limitations of standard well logging methods make it impossible to reliably identify productive reservoirs, determine boundary conditions, and delineate saturation. As a result, a unique approach is required, which includes the integration of special "high-tech" logging tools and wireline formation testers (WFT). This paper effectively demonstrates the use of this approach in an appraisal exploration well. The use of a wireline formation tester in conjunction with modern complex fluid analyzers and a radial probe allowed for testing several carbonate intervals with extremely low-permeability in one trip, which previously required stimulation to trigger fluid inflow in a cased well. This provided a new perspective on understanding the reservoir structure in the shortest amount of time possible.

Exploration and Formation Testing of Low Permeability Clastic Reservoir in Hot Slim-Diameter Open-Hole Well

2021 ◽  
Author(s):  
Vladislav Blinov ◽  
Elena Koshevaya ◽  
Samat Ramatullayev ◽  
Anton Filimonov ◽  
Kirill Shteynbrenner ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Well Logging ◽  
High Tech ◽  
Low Permeability ◽  
Extreme Conditions ◽  
Well Test ◽  
Fluid Analysis ◽  
Short Period ◽  
Open Hole ◽  
Exploration Well

Abstract The objective of the logging campaign was to explore the hydrocarbon deposits in low-permeability clastic reservoirs utilizing an advanced logging suite and a high-tech wireline formation tester (WFT). The exploration well, which had a diameter of 146 mm and was drilled to a vertical depth of 4750 m, had a temperature of 147 degrees Celsius downhole. Despite the challenging geological and downhole conditions: low permeability reservoir, high reservoir temperature, small wellbore diameter, and very high salinity drilling mud, the advanced logging suite data, which included nuclear magnetic resonance (NMR) and cross-dipole broadband acoustic logging, was successfully acquired. The WFT, which consists of a unique radial probe technology for efficient sampling of extremely low-permeability formations and a downhole fluid analyzer to determine the nature of the inflow and make rapid operational decisions in real time, was then used to perform downhole fluid analysis and sampling stations. Oil and gas-saturated reservoir intervals were identified, their porosity, water saturation, and permeability were evaluated, and an optimal open hole WFT program was produced as a result of the extended logging suite's interpretation. Special technological operations were performed during well logging in this well, allowing for the acquisition of high-quality NMR data under extreme conditions. Rapid processing and interpretation of well logging data, performed without any a priori reservoir data, allowing for the identification of the best permeability intervals in oil and gas-saturated reservoirs and the design of an optimal WFT program in an open hole. Downhole fluid analysis and sampling stations were performed with WFT with pressure build-up to determine fluid mobility to validate the presence of productive intervals. Thus, in several downhole trips in a relatively short period of time, potential hydrocarbon layers were assessed in an open hole section, and in the presence of sufficient fluid mobility, the saturation of the interval was determined by WFT. It is important to note that downhole gas samples were acquired in intervals having fluid mobility less than 0.06 mD/cP, where the conventional well test would most probably fail to induce a flow without stimulation. An integrated approach using modern well logging methods made it possible to solve the set geological challenges in the extreme conditions in this exploration well, where traditional methods would introduce significant uncertainties.

Public Libraries: Their Role in Smart City Strategies

2020 ◽  
Vol 58 (2(116)) ◽  
pp. 26-43
Author(s):  
Mariusz Luterek
Keyword(s):  
Smart City ◽  
Information Science ◽  
Public Libraries ◽  
Smart Cities ◽  
National Language ◽  
General Strategy ◽  
Language Version ◽  
Strategic Plans ◽  
Unique Approach ◽  
New Perspective

  Purpose/Thesis: This paper examines the position of public libraries in smart city strategies. To that end, I verify two hypotheses, H1: Cities analyzed employ strategic plans to define their path to “smartness”, and H2: Public libraries are a part of these strategies. Approach/Methods: Top 30 cities from the ranking of IESE Cities in Motion Index 2019 were se­lected. The hypotheses were tested through the analysis of strategy documents and web portals. In most cases, the analysis relied on English versions of said documents/portals, occasionally compared with the national language version . Results and conclusions: The process of verifying the first hypothesis led to identifying four groups: G1, comprising cities with a general strategy, presumed to include smart initiatives (3 cities), G2: cities with a separate “smart city” strategy, published on their own portal, or a related website (15 cities); G3: cities with subsites/portals briefly summarizing their activities in the area of ‘smart’ development (10 cities), and G4: cities with many sectoral strategies, presumed to include smart initiatives (2 ci­ties). The analysis allowed the identification of a number of areas in which public libraries already contribute to smart development: smart building, smart infrastructure, smart services, digital skills and life-long learning, sustainability, creativity, digital citizenship and smart business Originality/Value: Although many library and information science scholars study smart cities, no similar study has been conducted, and therefore, this paper, with its unique approach, offers a new perspective on the discussion on smart libraries.

Image-Based Petrophysical Parameters: CT Imaging of Chalk Cuttings and Experimental Comparisons by Plug-Size Upscaling

SPE Journal ◽  
2016 ◽  
Vol 22 (01) ◽  
pp. 41-52 ◽  
Author(s):  
Jakob Noe-Nygaard ◽  
Finn Engstrøm ◽  
Theis I. Sølling ◽  
Sven Roth
Keyword(s):  
Pore Space ◽  
Complex Structure ◽  
Ct Imaging ◽  
Low Permeability ◽  
Micro Ct ◽  
Two Phase ◽  
Petrophysical Parameters ◽  
Root Cause ◽  
Sufficient Detail ◽  
Experimental Comparisons

Summary In the present study, the focus is on two 2- to 3-mm cuttings-scale reservoir chalk samples chosen such that the resolution of the pore space is challenging the state of the art and the permeability differs by a factor of four. We compare the petrophysical parameters that are derived from nano-computed-tomography (nano-CT) images of trim sections and cuttings. Moreover, the trim-section results are upscaled to trim size to form the basis of an additional comparison. The results are also benchmarked against conventional core analysis (CCAL) results on trim-size samples. The comparison shows that petrophysical parameters from CT imaging agree reasonably well with those determined experimentally. The upscaled results show some discrepancy with the nano-CT results, particularly in the case of the low-permeability plug. This is probably because of the challenge in finding a representative subvolume. For the cuttings, the differences are significant for the low-permeability plug. For the two-phase-flow data, the predicted relative permeability endpoints differ significantly. The root cause of this again is attributed to the more-complex structure of the pore network in the low-permeability carbonate. The experiment was also run directly from the micro-CT results on a cutting measured on an in-house instrument; the results clearly show that micro-CT measurements on chalk do not capture the pore space with sufficient detail to be predictive. Overall, with the appropriate resolution, the present study shows that it is indeed feasible to obtain petrophysical parameters from imaging experiments on cuttings.

scholarly journals INCOME TAX PREFERENCE AND R&D INVESTMENTS OF HIGH-TECH ENTERPRISES IN CHINA

2021 ◽  
Vol 24 (4) ◽  
pp. 156-173
Author(s):  
Wunhong Su ◽  
Yi-Hao Fan
Keyword(s):  
Income Tax ◽  
Positive Relationship ◽  
High Tech ◽  
Tax Rate ◽  
Tax Preference ◽  
Market Competitiveness ◽  
Innovative Environment ◽  
Rate Policy ◽  
New Perspective ◽  
Tax Deduction

This study explores the relationship between income tax preference and R&D investments of high-tech enterprises. This study selects listed high-tech enterprises in China from 2013 to 2018 as samples. The empirical results show that the effective income tax rate among high-tech enterprises in China differs widely. The findings suggest that high-tech enterprises in China have to take advantage of preferential income tax, pay more attention to R&D investments, and strive to improve R&D ability and market competitiveness. In addition, there is a significantly positive relationship between income tax preference and R&D investments of high-tech enterprises, indicating that the preferential tax rate policy and other tax incentives such as additional tax deduction increase R&D investments of high-tech enterprises effectively. State-owned enterprises (SOEs) are enterprises in which the state has ownership or control over its capital. The positive relation between income tax preference and R&D investments of hightech enterprises is more significant for non-SOEs. Non-SOEs have stronger governance efficiency. Therefore, SOEs should make better use of income tax preference and improve innovation enthusiasm. Moreover, this study finds a more positive relationship between income tax preference and R&D investments among high-tech enterprises in the introduction phase than in the growth and mature phases. However, the relation between income tax preference and R&D investments is insignificant for high-tech enterprises in the decline phase. The findings seem to provide a new perspective for the life cycle characteristics of enterprises and the theoretical guidance to enterprises in phases of growth, mature and decline to develop R&D investments better. Finally, loss enterprises or enterprises in geographical units with the innovative environment are eliminated in this study to avoid extra interference. The results remain robust, indicating that preferential income tax policies applied in high-tech enterprises are significantly and positively associated with R&D investments.

scholarly journals GEODYNAMICS

GEODYNAMICS ◽  
2011 ◽  
Vol 2(11)2011 (2(11)) ◽  
pp. 41-43
Author(s):  
S. A. Vyzhva ◽  
◽  
I. Bezrodna ◽  
Keyword(s):  
Pore Space ◽  
Well Logging ◽  
Practical Implementation ◽  
Acoustic Data

Methodology is given estimates of rock-collectors according to the well-logging through inversion of acoustic data in the structure of pore space and its practical implementation on the example of carbonate horizons of well number 35 Lypovo -Dolinska area.

Petroelastic Modeling of Complex Lithology Fields: Case Study

2021 ◽  
Author(s):  
Anastasiia Spirina ◽  
Evgeniy Cherepanov
Keyword(s):  
Pore Space ◽  
Complex Structure ◽  
Geophysical Methods ◽  
Core Sample ◽  
Reservoir Properties ◽  
Production Water ◽  
High Production ◽  
Water Cut ◽  
Effective Models ◽  
Component Models

Abstract The present-day growth of petroleum reserves, maintaining and enhancing of oil production is associated with involving of complex fields into production (Uspenskaya, 2014). The complex structure of the study areas of the Urai Region (facies variability, formation replacement, fracturing, crushing and cleavage zones, complicated structure of the pore space) makes conventional forecast of reservoir properties ineffective. Moreover, the pay formations are highly exhausted with high production water cut. Therefore, the search of prospective targets is relevant in the Urai Region. The article shows generalized results of petroelastic modeling of several fields of the Urai Region for solving the following tasks: ○ Lithology, saturation and poroperm properties forecast of reservoir rocks from log and seismic data; ○ Development of 1D mechanical earth models (MEM) of horizontal well sections and their maintenance while drilling horizontal wells. The approach is based on the principles of integrating different-scale geological and geophysical studies. The lithological division of rocks was carried out, the saturation behavior and point-by-point interpretation of the data of geophysical methods of well logging (WL) were identified. 3D component models were built with taking into account the lithological features of the section using core sample studies. Effective models for the environment of sediments of interest were selected and petroelastic modeling was carried out.

scholarly journals Prediction of filtration and capacitive properties and oil saturation characteristics of complex structure carbonate reservoirs (on the example of the Northwestern part of DDB)

2020 ◽  
pp. 78-87
Author(s):  
O. V. Oliinyk ◽  
S. A. Vyzhva ◽  
V. V. Antoniuk ◽  
I. M. Bezrodna
Keyword(s):  
Gamma Ray ◽  
Complex Structure ◽  
Well Logging ◽  
Carbonate Reservoir ◽  
Donets Basin ◽  
Northwestern Part ◽  
Oil Saturation ◽  
Reservoir Rocks ◽  
Capacitive Properties ◽  
Carbonate Deposits

The world achievements of the study of carbonate reservoir rocks with secondary voids have been analyzed. An integrated approach to the study of this type of reservoir has been demonstrated on the example of reservoir rocks of the Visean strata of the South-Berestivske field in the North-Western part of the Dnipro-Donets Basin. The purpose of this article is to predict the reservoir filtration-capacitive properties, as well as oil saturation characte-ristics of complex carbonate reservoir rocks using well logging data. To solve this problem, an integrat-ed approach is used. It includes the methods of porosities balance and functional transformations (normalization) of the electrical and radioactive well logging curves (lateral logging - neutron gamma ray logging, impulse neu-tron-neutron logging - neutron gamma ray logging). As a result, the authors have identified intervals in the Visean carbonate deposits with cavernous voids and cracks. Each individual geophysical method is influenced by the structure of the void space. Due to this, when calculating the porosity coefficient for different probes, the au-thors identify intervals represented by carbonate deposits, mainly of the porous-cavernous type. However, there is an interval of 4287.6-4289.6 m of porous-cavernous-fractured type. It is established that in the selected layers the coefficients of different types of porosity are: secondary - 2.5-6%, cavernous - 1.7-5% and fracture -0.2%. The thickness of pro-ductive sediments varies within 0.8 - 2.4 m (the average value is 2 m). The authors also substantiated the choice of parameters when calculating the saturation coefficient in complex structural reservoirs. Moreover, it is noted that the reservoir properties are provided by the presence of secondary voids, namely the cavities through which the fluid is filtered, and the rock matrix is compacted, poor-porous and low-permeable.

scholarly journals Sedimentological control of the cretaceous deposits petroleum potential within the Russko-Chaselskiy ridge (Western Siberia)

2016 ◽  
pp. 63-70
Author(s):  
V. A. Zhemchugova ◽  
M. O. Berbenev
Keyword(s):  
Seismic Data ◽  
Western Siberia ◽  
Oil And Gas ◽  
Complex Structure ◽  
3D Seismic ◽  
Petroleum Potential ◽  
Integrated Interpretation ◽  
New Perspective ◽  
3D Seismic Data ◽  
Cretaceous Deposits

Most of hydrocarbon resources of Russko-Chaselskiy ridge is associated with reservoirs of Pokur Formation. It is composed generally of alluvial sandstones and shales. Due to genesis Pokur reservoirs have complex structure and localized spread within ancient alluvial plains. Performed integrated interpretation of well and 3D seismic data allowed to estimate new perspective fields and to geometrize oil and gas pulls.

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