scholarly journals LOWER MIOCENE RESERVOIRS STRUCTURE AND DEPOSITIONAL ENVIRONMENTS OF THE CENTRAL PART OF DRAGON OILFIELD (VIETNAM)

2015 ◽  
pp. 40-45
Author(s):  
E. V. Frolova
Keyword(s):  
Oil Recovery ◽  
Central Area ◽  
Seismic Interpretation ◽  
Depositional Environments ◽  
Core Analysis ◽  
Geological Model ◽  
Lower Miocene ◽  
Oil Reserves ◽  
The Core ◽  
Wireline Logs

The paper presents the results of the study of the structure and depositional environments formation in the lower Miocene reservoirs in the Central area of Dragon field (Cuu Long basin, Vietnam offshore) based on litho-facial, electro-facial, seismic-facial analyses, and biostratigraphy data and the deposits thickness analysis. The geological model refining had been done through the core analysis, seismic interpretation, wireline logs integration and via defi-nition of the depositional environments. The results received permit to predict the depositional environments distribu-tion in the areas that were not identified by drilling, to make more exact the area oil reserves evaluation, to enhance the oil recovery.

INTERSTITIAL WATER SATURATION IN THE PORE SPACE OF OIL RESERVOIRS

Geophysics ◽  
1936 ◽  
Vol 1 (3) ◽  
pp. 353-364
Author(s):  
James A. Lewis ◽  
William L. Horner
Keyword(s):  
Interstitial Water ◽  
Water Saturation ◽  
Direct Method ◽  
Pore Space ◽  
Oil Reservoir ◽  
Core Analysis ◽  
Fluid Content ◽  
Oil Reserves ◽  
The Core ◽  
A Direct Method

The presence of water in oil reservoir cores has been observed for several years by analysts using a direct method for fluid content determinations. The actual amount of water that is present in the sand is of importance in the estimation of oil reserves as well as in determining the type of fluid which a particular stratum will produce under conditions favorable for flow into the well. The core analysis profile of a well cored with oil (using Baker Core Barrel) is compared with three other wells which were cored with water. The analysis of the former core is in close agreement with respect to oil and water saturations, 30.58%, 44.40% respectively, with other cores in the area, and points to the conclusion that water was distributed throughout the sand section with no indication of gravitational separation at the time of coring. Coring with oil or the addition of indicators to the fluid used during coring and the subsequent analysis of same are methods for determining correct interstitial water saturation.

scholarly journals Main features of modeling terrigenous deposits in East-Siberia using the example of the Hamakinsky horizon

2021 ◽  
Vol 6 (4) ◽  
pp. 32-42
Author(s):  
Dmitriy V. Kozikov ◽  
Mikhail A. Vasiliev ◽  
Konstantin V. Zverev ◽  
Andrei N. Lanin ◽  
Shafkat A. Nigamatov ◽  
...  
Keyword(s):  
Pilot Project ◽  
Business Case ◽  
Geological Model ◽  
Delta Front ◽  
Production Forecast ◽  
Gas Field ◽  
Oil Reserves ◽  
The Core ◽  
Petrophysical Model ◽  
Thin Section Analysis

Background. The article considers the results of updating the geological model of the khamakinskii horizon reservoirs of the Chayandinskoe oid and gas field. The main aim is project the production of the oil rims and form a positive business case of the project. Materials and methods. Conceptual sedimentary model bases on the core of the 14 wells. Updating of the petrophysical model is the key to identify post-sedimentary transformations (like anhydritization and halitization) and the opportunity to correct the permeability trend. The tectonic pattern of the horizon based on the interpretation of 3D seismic data. There are two groups of faults were identified: certain and possible. Neural networks algorithm uses for a creating the predictive maps of anhydritization, which are used in the geological model. Results. Estuary sands influenced by fluvial and tidal processes dominate the khamakinskii horizon. The reservoir is irregular vertically: at the base of the horizon, there are sandstones of the delta front and there are alluvial valley with fluvial channels in the middle and upper parts. Eustary sands eroded by incised valleys (alluvial channels). According to the core and thin section analysis, the main uncertainty is sedimentary transformations of reservoir. It affects the net thickness and then the volume of oil in productive wells. 3D geological model includes the trends of anhydritization and halitization over the area, which makes it possible to obtain a more accurate production forecast. Conclusion. As part of the probability estimate of oil reserves, the main geological parameters that affect the volume of reserves were identified. Pilot project is planning to remove geological and technical uncertainties.

Financial and Economic Support of Innovation Processes in the Russian Fuel and Energy Complex

2019 ◽  
Vol 12 (3) ◽  
pp. 77-85
Author(s):  
L. D. Kapranova ◽  
T. V. Pogodina
Keyword(s):  
Oil Recovery ◽  
Large Scale ◽  
Oil And Gas ◽  
New Technologies ◽  
Innovative Development ◽  
Oil Reserves ◽  
Energy Complex ◽  
Innovation Activities ◽  
Substantial Investment ◽  
The Government

The subject of the research is the current state of the fuel and energy complex (FEC) that ensures generation of a significant part of the budget and the innovative development of the economy.The purpose of the research was to establish priority directions for the development of the FEC sectors based on a comprehensive analysis of their innovative and investment activities. The dynamics of investment in the fuel and energy sector are considered. It is noted that large-scale modernization of the fuel and energy complex requires substantial investment and support from the government. The results of the government programs of corporate innovative development are analyzed. The results of the research identified innovative development priorities in the power, oil, gas and coal sectors of the fuel and energy complex. The most promising areas of innovative development in the oil and gas sector are the technologies of enhanced oil recovery; the development of hard-to-recover oil reserves; the production of liquefied natural gas and its transportation. In the power sector, the prospective areas are activities aimed at improving the performance reliability of the national energy systems and the introduction of digital technologies. Based on the research findings, it is concluded that the innovation activities in the fuel and energy complex primarily include the development of new technologies, modernization of the FEC technical base; adoption of state-of-the-art methods of coal mining and oil recovery; creating favorable economic conditions for industrial extraction of hard-to-recover reserves; transition to carbon-free fuel sources and energy carriers that can reduce energy consumption and cost as well as reducing the negative FEC impact on the environment.

scholarly journals Enhanced Oil Recovery Using CO2 in Alaska

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 98
Author(s):  
Banabas Dogah ◽  
Vahid Atashbari ◽  
Mohabbat Ahmadi ◽  
Brent Sheets
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Comprehensive Overview ◽  
Thermal Methods ◽  
Oil Reserves ◽  
Viscous Oil ◽  
Co2 Eor ◽  
Permafrost Thawing ◽  
Petroleum Reserves ◽  
Shallow Reservoirs

Alaska holds more than 68 billion barrels of proved oil reserves and more than 36.7 trillion cubic feet of proved natural gas reserves with some special conditions such as proximity to permafrost, making Alaskan petroleum reserves unique. The low temperature in shallow reservoirs prohibited hydrocarbons’ ideal maturation, thereby generating several heavy and viscous oil accumulations in this state. This also limits the enhanced oil recovery (EOR) options, leaving the thermal methods off the table to avoid permafrost thawing, which can cause wellbore collapse. Several solutions have been attempted for improving oil production from heavy and viscous oil in Alaska; however, they have not yielded the desired recovery, and ultimate recovery factors are still less than the global average. One solution identified as a better alternative is using CO2 as an injecting fluid, alternated by water or mixed with other injectants. This paper provides a comprehensive overview of all studies on using CO2 for enhanced oil recovery purposes in Alaska and highlights common and unique challenges this approach may face. The suitability of CO2-EOR methods in the Alaskan oil pools is examined, and a ranking of the oil pools with publicly available data is provided.

scholarly journals Depositional Landforming Processes at the Snouts of Five Surging Glaciers in Vestspitsbergen (Abstract only)

1981 ◽  
Vol 2 ◽  
pp. 115-115 ◽  
Author(s):  
D. G. Croot
Keyword(s):  
Simple Model ◽  
Recent Work ◽  
Central Area ◽  
Morphological Features ◽  
Landscape Development ◽  
Maximum Extension ◽  
The Core ◽  
Polar Environment ◽  
Compressive Flow ◽  
Ice Leads

Recent work by Clapperton (1975) proposes that the rapid rates of advance experienced by glaciers which surge may lead to enhanced debris incorporation, increased compressive flow near the glacier snout at the point of maximum extension, and to the upward translation and vertical stacking of debris near the glacier snout and margin. Five glaciers in Spitsbergen (Battyebreen, Holmströmbreen, Lisbetbreen, Vonbreen, Elnabreen) display morphological features which are widely accepted as being diagnostic of surging glaciers.Results of detailed observations regarding the nature, distribution, melt-out, and reworking of englacial debris at Battyebreen are presented. Basally derived till is brought to the surface of the glacier in narrow lateral and terminal belts, no more than 100 m wide. Within this zone, (i.e. up-valley from the snout and towards the valley centre) the ice is debris-free with the exception of small amounts of en-glacial debris which form the core of lobate medial moraines. Differential ablation of debris-free and debris-rich ice leads to the production of a topographic basin within which melt-out and reworking processes occupy restricted locations, as follows. Immediately inside the encircling melt-out till, a zone of flow tills is found. Melt streams are located at the foot of, the flow till-mantled slope, producing narrow (150 m wide) outwash trains, which merge into deltas. The central area of the topographic basin is occupied by a supraglacial lake.Observations of the remaining four locations confirm that other glaciers in the vicinity, which display similar characteristics associated with surging, are developing a stagnant-ice zone of identical appearance. The pattern of processes observed at Battyebreen is thus repeated at each site.A simple model of depositional landscape development is proposed for surging valley glaciers in a sub-polar environment.

scholarly journals Recovery rates, enhanced oil recovery and technological limits

2014 ◽  
Vol 372 (2006) ◽  
pp. 20120320 ◽  
Author(s):  
Ann Muggeridge ◽  
Andrew Cockin ◽  
Kevin Webb ◽  
Harry Frampton ◽  
Ian Collins ◽  
...  
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Current Status ◽  
Comprehensive Overview ◽  
Oil Reserves ◽  
The North ◽  
History Of ◽  
The North Sea ◽  
Giant Fields ◽  
Broad Consensus

Enhanced oil recovery (EOR) techniques can significantly extend global oil reserves once oil prices are high enough to make these techniques economic. Given a broad consensus that we have entered a period of supply constraints, operators can at last plan on the assumption that the oil price is likely to remain relatively high. This, coupled with the realization that new giant fields are becoming increasingly difficult to find, is creating the conditions for extensive deployment of EOR. This paper provides a comprehensive overview of the nature, status and prospects for EOR technologies. It explains why the average oil recovery factor worldwide is only between 20% and 40%, describes the factors that contribute to these low recoveries and indicates which of those factors EOR techniques can affect. The paper then summarizes the breadth of EOR processes, the history of their application and their current status. It introduces two new EOR technologies that are beginning to be deployed and which look set to enter mainstream application. Examples of existing EOR projects in the mature oil province of the North Sea are discussed. It concludes by summarizing the future opportunities for the development and deployment of EOR.

scholarly journals A new slick water system for hydraulic fracturing in tight reservoir to enhance imbibition oil recovery

2021 ◽  
Vol 303 ◽  
pp. 01001
Author(s):  
Yu Haiyang ◽  
Ji Wenjuan ◽  
Luo Cheng ◽  
Lu Junkai ◽  
Yan Fei ◽  
...  
Keyword(s):  
Contact Angle ◽  
Interfacial Tension ◽  
Hydraulic Fracturing ◽  
Oil Recovery ◽  
Water System ◽  
Natural Fracture ◽  
Fracturing Fluid ◽  
The Core ◽  
Ultralow Permeability

In order to give full play to the role of imbibition of capillary force and enhance oil recovery of ultralow permeability sandstone reservoir after hydraulic fracturing, the mixed water fracture technology based on functional slick water is described and successfully applied to several wells in oilfield. The core of the technology is determination of influence factors of imbibition oil recovery, the development of new functional slick water system and optimization of volume fracturing parameters. The imbibition results show that it is significant effect of interfacial tension, wetting on imbibition oil recovery. The interfacial tension decreases by an order of magnitude, the imbibition oil recovery reduces by more than 10%. The imbibition oil recovery increases with the contact angle decreasing. The emulsifying ability has no obvious effect on imbibition oil recovery. The functional slick water system considering imbibition is developed based on the solution rheology and polymer chemistry. The system has introduced the active group and temperature resistant group into the polymer molecules. The molecular weight is controlled in 1.5 million. The viscosity is greater than 2mPa·s after shearing 2h under 170s-1 and 100℃. The interfacial tension could decrease to 10-2mN/m. The contact angle decreased from 58° to 22° and the core damage rate is less than 12%. The imbibition oil recovery could reach to 43%. The fracturing process includes slick water stage and linear gel stage. 10% 100 mesh ceramists and 8% temporary plugging agents are carried into the formation by functional slick water. 40-70 mesh ceramists are carried by linear gel. The liquid volume ratio is about 4:1 and the displacement is controlled at 10-12m3/min. The sand content and fracturing fluid volumes of single stage are 80m3 and 2500 m3 respectively. Compared with conventional fracturing, due to imbibition oil recovery, there is only 25% of the fracturing fluid flowback rate when the crude oil flew out. When the oil well is in normal production, about 50% of the fracturing fluid is not returned. It is useful to maintain the formation energy and slow down the production decline. The average cumulative production of vertical wells is greater than 2800t, and the effective period is more than 2 years. This technology overcoming the problem of high horizontal stress difference and lack of natural fracture has been successfully applied in Jidong Oilfield ultralow permeability reservoir. The successful application of this technology not only helps to promote the effective use of ultralow permeability reservoirs, but also helps to further clarify the role of imbibition recovery, energy storage and oil-water replacement mechanism.

scholarly journals Facies Analysis and Depositoinal Environment of D-3 Reservoir Sands Vin Field, Eastern Niger Delta

2019 ◽  
pp. 1-19
Author(s):  
Onyewuchi, Chinedu Vin ◽  
Minapuye, I. Odigi
Keyword(s):  
Seismic Data ◽  
Niger Delta ◽  
Depositional Environment ◽  
Gamma Ray ◽  
Facies Analysis ◽  
Depositional Environments ◽  
Width Ratio ◽  
Neutron Density ◽  
Wireline Logs ◽  
Isopach Map

Facies analysis and depositional environment identification of the Vin field was evaluated through the integration and comparison of results from wireline logs, core analysis, seismic data, ditch cutting samples and petrophysical parameters. Well log suites from 22 wells comprising gamma ray, resistivity, neutron, density, seismic data, and ditch cutting samples were obtained and analyzed. Prediction of depositional environment was made through the usage of wireline log shapes of facies combined with result from cores and ditch cuttings sample description. The aims of this study were to identify the facies and depositional environments of the D-3 reservoir sand in the Vin field. Two sets of correlations were made on the E-W trend to validate the reservoir top and base while the isopach map was used to establish the reservoir continuity. Facies analysis was carried out to identify the various depositional environments. The result showed that the reservoir is an elongate , four way dip closed roll over anticline associated with an E-W trending growth fault and contains two structural high separated by a saddle. The offshore bar unit is an elongate sand body with length: width ratio of >3:1 and is aligned parallel to the coast-line. Analysis of the gamma ray logs indicated that four log facies were recognized in all the wells used for the study. These include: Funnel-shaped (coarsening upward sequences), bell-shaped or fining upward sequences, the bow shape and irregular shape. Based on these categories of facies, the depositional environments were interpreted as deltaic distributaries, regressive barrier bars, reworked offshore bars and shallow marine. Analysis of the wireline logs and their core/ditch cuttings description has led to the conclusion that the reservoir sandstones of the Agbada Formation in the Vin field of the eastern Niger Delta is predominantly marine deltaic sequence, strongly influenced by clastic output from the Niger Delta. Deposition occurred in a variety of littoral and neritic environment ranging from barrier sand complex to fully marine outer shelf mudstones.

scholarly journals Modification of Xanthan Gum for a High-Temperature and High-Salinity Reservoir

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4212
Author(s):  
Mohamed Said ◽  
Bashirul Haq ◽  
Dhafer Al Shehri ◽  
Mohammad Mizanur Rahman ◽  
Nasiru Salahu Muhammed ◽  
...  
Keyword(s):  
High Temperature ◽  
Oil Recovery ◽  
Xanthan Gum ◽  
Elevated Temperatures ◽  
High Salinity ◽  
Residual Oil ◽  
Core Flooding ◽  
Nacl Solution ◽  
The Core ◽  
Tertiary Oil Recovery

Tertiary oil recovery, commonly known as enhanced oil recovery (EOR), is performed when secondary recovery is no longer economically viable. Polymer flooding is one of the EOR methods that improves the viscosity of injected water and boosts oil recovery. Xanthan gum is a relatively cheap biopolymer and is suitable for oil recovery at limited temperatures and salinities. This work aims to modify xanthan gum to improve its viscosity for high-temperature and high-salinity reservoirs. The xanthan gum was reacted with acrylic acid in the presence of a catalyst in order to form xanthan acrylate. The chemical structure of the xanthan acrylate was verified by FT-IR and NMR analysis. The discovery hybrid rheometer (DHR) confirmed that the viscosity of the modified xanthan gum was improved at elevated temperatures, which was reflected in the core flood experiment. Two core flooding experiments were conducted using six-inch sandstone core plugs and Arabian light crude oil. The first formulation—the xanthan gum with 3% NaCl solution—recovered 14% of the residual oil from the core. In contrast, the modified xanthan gum with 3% NaCl solution recovered about 19% of the residual oil, which was 5% higher than the original xanthan gum. The xanthan gum acrylate is therefore more effective at boosting tertiary oil recovery in the sandstone core.

scholarly journals SURAT DAKWAH NABI MUHAMMAD SAW (ANALISIS TEMATIK ATAS SURAT-SURAT NABI MUHAMMAD KEPADA PARA RAJA)

1970 ◽  
Vol 13 (1) ◽  
pp. 28-46 ◽  
Author(s):  
Ubaidillah Ubaidillah
Keyword(s):  
Thematic Analysis ◽  
Basic Theory ◽  
Core Analysis ◽  
Major Theme ◽  
Son Of God ◽  
The Core ◽  
Present Context ◽  
Unity Of God ◽  
Bahasa Indonesia ◽  
Name Of God

This paper aims to find the themes of propagation of Islam Prophet Muhammad in the early spread of Islam that can be used uswah h}asanah by preachers in Indonesia in spreading Islam in accordance with the present context. Letters were used as the data in this study are the letters sent by the Prophet Muhammad to the king superpower in the Roman and Persian kings and their little under the authority of the king of the superpower. The letters are including in these types of letter are ten letters. Stanton thematic theory which states that the theme (theme) is contained in the meaning of a story, become the basic theory in this study. In addition, there is also a theme in the study of the distribution of known theme with theme of major and minor themes. In analyzing the data, before entering the core analysis, the author uses the method of analysis and match with sub-method translational match. In this case, the letters of the Prophet Muhammad first translated into Indonesian, after it analyzed according issues to be answered. The findings of this thematic analysis form the major theme of “propagation of Islam” whose content is tailored to the circumstances of the king recipients. Of the major themes, there are minor themes are used to support the universality of the major themes of these letters, they are: dakwah must be by the name of God, pray forsalvation only to Muslims, Jesus is not the son of God, all the religions of Semitic is unity of God (tawhid), religion God recognized only Islam, and Islam is tolerant religion. Tulisan ini bertujuan untuk mencari tema-tema dakwah Islam Nabi Muhammad pada awal penyebaran Islam yang dapat dijadikan uswah h}asanah oleh para da’i di Indonesia dalam menyebarkan agama Islam yang sesuai dengan konteks kekinian. Surat yang dijadikan data pada penelitian ini adalah surat-surat yang dikirim oleh Nabi Muhammad kepada para raja adidaya di Romawi dan Persi beserta raja-raja kecil yang berada di bawah kekuasaan kedua raja adidaya tersebut. Yang temasuk dalam jenis surat ini sejumlah sepuluh pucuk surat. Teori tematik Stanton dan Kenny yang menyatakan bahwa tema (theme) adalah makna yang dikandung sebuah cerita, menjadi landasan teori dalam penelitian ini. Selain itu, terdapat pula pembagian tema yang dalam kajian tema dikenal dengan tema mayor dan tema minor. Dalam menganalisis data, sebelum masuk pada analisis inti, penulis menggunakan metode analisis padan dengan submetode padan translasional. Dalam hal ini, surat-surat Nabi Muhammad tersebut diterjemahkan terlebih dahulu ke dalam bahasa Indonesia, setelah itu dianalisis sesuai permasalahan yang ingin dijawab. Temuan dari analisis tematik ini berupa tema mayor tentang “dakwah Islam” yang isinya disesuaikan dengan keadaan para raja penerima surat. Dari tema mayor tersebut, terdapat tema-tema minor yang digunakan untuk mendukung keuniversalan tema mayor surat-surat tersebut, yaitu berdakwah harus karena Allah, mendoakan keselamatan hanya untuk muslim, Nabi Isa bukananak Tuhan, seluruh ajaran agama semitik adalah pengesaan Allah, agama yang diakui Allah hanya Islam, dan Islam agama yang toleran.

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