The Results of an Integrated Study of Unconventional Reservoirs and a First Attempt at their Development

2021 ◽  
Author(s):  
Alexey Kudryashov
Keyword(s):  
Unconventional Reservoirs ◽  
Optimal Placement ◽  
Well Performance ◽  
Multi Stage ◽  
Integrated Research ◽  
Production Wells ◽  
Initial Hypothesis ◽  
The Republic ◽  
Integrated Program ◽  
Integrated Study

Abstract Rechitsa multi-play oilfield is located within the Rechitsko-Vishanskaya subregional area of local uplifts of the Rechitsko-Vishanskaya tectonic stage of the Northern structural zone of the Pripyat Trough in the Republic of Belarus. Since 2014, Production Association Belorusneft has been conducting integrated research to study oil bearing capacity of sediments within rock Units I-III, which were previously considered to have no potential. Since then, the lithological and petrophysical, pyrolytic, and geomechanical features of the structure of these sediments have been studied. The research has confirmed the initial hypothesis that the studied sediments are unconventional reservoirs with source-rock genesis and contain hydrocarbons both of their own genesis and those which migrated from other rocks. The results of drilling and completion of horizontal exploration wells with multi-stage hydraulic fracturing confirmed the potential for obtaining commercial oil from the sediments of the unconventional reservoirs. At the same time, there were doubts about the optimal placement of the horizontal wells, the choice of completion strategy, and if the well performance lived up to the actual maximum potential of these sediments. The paper sums up the main results of implementing an integrated program for studying unconventional reservoirs of the Rechitsa oilfield, as well as of drilling and operating production wells to date.

scholarly journals Fear and floods in Serbia: Citizens preparedness for responding to natural disaster

2016 ◽  
pp. 303-324 ◽  
Author(s):  
Vladimir Cvetkovic
Keyword(s):  
Natural Disaster ◽  
Random Sample ◽  
Quantitative Research ◽  
Research Results ◽  
Multi Stage ◽  
The Family ◽  
The Republic ◽  
The Impact ◽  
The City ◽  
Safety Procedures

The consequences of the floods that had affected the area of Serbia in 2014 indicated a very low level of preparedness of population to respond to natural disasters. Therefore, the aim of quantitative research is to examine the impact of fear on the willingness of citizens to respond to a natural disaster caused by the flood in the Republic of Serbia. Bearing in mind all local communities in Serbia where floods occurred or there is a high risk of flooding, there was selected a random sample consisting of 19 out of 150 municipalities and 23 towns and the city of Belgrade. In the selected communities, a research was undertaken in those areas that had been most affected in relation to the amount of water or potential risk of flooding. The survey used strategy of testing in households with the use of a multi- stage random sample. The research results indicate that the citizens who have a fear of floods are familiar with safety procedures to a greater extent in relation to citizens who do not have the fear; they have taken the preventive measures; they point out that they still are not ready to respond, but plan to do so in the next 6 months; they would evacuate to the upper floor of the house; they point out that someone in the family has educated them about the flood. In contrast to that, citizens who do not have the fear are not doing anything to prepare themselves to react in such situations, they are confident in their own abilities to cope with the consequences of floods, etc. The originality of the research lies in the fact that in Serbia there has never been conducted a research to examine the state of preparedness of citizens to respond. Bearing in mind that the research is based on the territory of Serbia, conclusions can be generalized to the entire population. The research results can be used when creating a strategy for improving the level of preparedness of citizens to respond.

Electoral Distortion under STV Random Sampling Procedures

1986 ◽  
Vol 16 (2) ◽  
pp. 243-253 ◽  
Author(s):  
Michael Gallagher ◽  
A. R. Unwin
Keyword(s):  
Random Sampling ◽  
Social Choice Function ◽  
Electoral System ◽  
Approval Voting ◽  
Multi Stage ◽  
Low Degree ◽  
Degree Of Acceptance ◽  
The Republic ◽  
Sampling Procedures ◽  
The Impact

This Note will discuss the impact of random sampling at elections conducted under the single transferable vote (STV) electoral system in multi-member constituencies in the Republic of Ireland. STV, partly because of its popularity among electoral reformers, has received considerable theoretical scrutiny. It has been given an ‘intermediate’ rating in recent assessment of a number of electoral systems, and dismissed as a ‘perverse social choice function’ because it is subject to non-monotonicity. This shortcoming is also mainly responsible for the low degree of acceptance accorded to it by Brams and Fishburn. Nurmi concludes that STV (like other multi-stage systems) performs poorly, with regard to a number of criteria, in comparison with one-stage systems like approval voting. Black complains that STV ‘is a compound of minor complexities and is difficult to remember’. Others have discussed shortcomings in STV and suggested remedies which can be implemented where the counting of votes is entirely computerized.

Probabilistically Mapping Well Performance in Unconventional Reservoirs With a Physics-Based Decline-Curve Model

2019 ◽  
Vol 22 (04) ◽  
pp. 1527-1550 ◽  
Author(s):  
Rafael Wanderley de Holanda ◽  
Eduardo Gildin ◽  
Peter P. Valkó
Keyword(s):  
Unconventional Reservoirs ◽  
Well Performance ◽  
Decline Curve ◽  
Curve Model

Integrated simulation of multi-stage hydraulic fracturing in unconventional reservoirs

2016 ◽  
Vol 36 ◽  
pp. 875-892 ◽  
Author(s):  
Huiying Tang ◽  
Philip H. Winterfeld ◽  
Yu-Shu Wu ◽  
Zhao-qin Huang ◽  
Yuan Di ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Unconventional Reservoirs ◽  
Integrated Simulation ◽  
Multi Stage

The Ensign Field, Blocks 48/14a, 48/15a and 48/15b, UK North Sea

2020 ◽  
Vol 52 (1) ◽  
pp. 172-179 ◽  
Author(s):  
V. W. J. Verlinden ◽  
H. Basford
Keyword(s):  
North Sea ◽  
Regional Scale ◽  
Fracture Network ◽  
Natural Fracture ◽  
Well Performance ◽  
Gas Recovery ◽  
Production Wells ◽  
Sandstone Formation ◽  
Low Offset

AbstractThe Ensign Field is located in UK offshore licence Blocks 48/14a, 48/15a and 48/15b. The field is located 100 km east of the Humberside coast within the Sole Pit area of the Southern North Sea. The reservoir consists of sandstones of the Permian Rotliegend Group (Leman Sandstone Formation). Reservoir quality has been impacted by diagenesis during deep burial, whereby illitization has reduced permeability to sub-millidarcy scale. The field has been developed with two horizontal production wells, both completed with five hydraulic fracture stages. First gas from the field was achieved in 2012 via the Ensign normally unmanned installation and exported through the Lincolnshire Offshore Gas Gathering System. The field is compartmentalized by multiple regional-scale De Keyser fault zones. A heterogeneous natural fracture network exists with only a limited contribution to flow. Well performance and ultimate gas recovery have been lower than originally anticipated due to sub-optimal completions and a higher degree of compartmentalization than originally expected. The volume of gas that is connected to the wells is limited by low-offset faults, which have been identified by integrating long-term production data, and core, log and reprocessed seismic data. Production ceased in 2018 when the original export route was decommissioned.

Augmented AI Framework for Well Performance Prediction and Opportunity Identification in Unconventional Reservoirs

2020 ◽  
Author(s):  
Hamed Darabi ◽  
Xiang Zhai ◽  
Amir Kianinejad ◽  
Zheren Ma ◽  
David Castineira ◽  
...  
Keyword(s):  
Performance Prediction ◽  
Unconventional Reservoirs ◽  
Well Performance ◽  
Opportunity Identification
Sign in / Sign up

Export Citation Format

Share Document