Application of Locality Preserving Projection-Based Unsupervised Learning in Predicting the Oil Production for Low-Permeability Reservoirs

SPE Journal ◽  
2020 ◽  
Author(s):  
Yuan Zhang ◽  
Jinghong Hu ◽  
Qi Zhang
Keyword(s):  
Unsupervised Learning ◽  
Oil Production ◽  
Low Permeability ◽  
Locality Preserving Projection ◽  
Locality Preserving ◽  
Low Permeability Reservoirs

scholarly journals The efficiency of gas injection into low-permeability multilayer hydrocarbon reservoirs

2021 ◽  
Vol 3 (10) ◽  
pp. 100-108
Author(s):  
Sudad H AL-Obaidi ◽  
Miel Hofmann ◽  
Falah H. Khalaf ◽  
Hiba H. Alwan
Keyword(s):  
Hydraulic Fracturing ◽  
Oil Recovery ◽  
Gas Injection ◽  
Oil Production ◽  
Recovery Factor ◽  
Low Permeability ◽  
Compositional Model ◽  
Multistage Hydraulic Fracturing ◽  
Low Permeability Reservoirs ◽  
Working Agent

The efficiency of gas injection for developing terrigenous deposits within a multilayer producing object is investigated in this article. According to the results of measurements of the 3D hydrodynamic compositional model, an assessment of the oil recovery factor was made. In the studied conditions, re-injection of the associated gas was found to be the most technologically efficient working agent. The factors contributing to the inefficacy of traditional methods of stimulating oil production such as multistage hydraulic fracturing when used to develop low-permeability reservoirs have been analyzed. The factors contributing to the inefficiency of traditional oil-production stimulation methods, such as multistage hydraulic fracturing, have been analysed when they are applied to low-permeability reservoirs. The use of a gas of various compositions is found to be more effective as a working agent for reservoirs with permeability less than 0.005 µm2. Ultimately, the selection of an agent for injection into the reservoir should be driven by the criteria that allow assessing the applicability of the method under specific geological and physical conditions. In multilayer production objects, gas injection efficiency is influenced by a number of factors, in addition to displacement, including the ratio of gas volumes, the degree to which pressure is maintained in each reservoir, as well as how the well is operated. With the increase in production rate from 60 to 90 m3 / day during the re-injection of produced hydrocarbon gas, this study found that the oil recovery factor increased from 0.190 to 0.229. The further increase in flow rate to 150 m3 / day, however, led to a faster gas breakthrough, a decrease in the amount of oil produced, and a decrease in the oil recovery factor to 0.19 Based on the results of the research, methods for stimulating the formation of low-permeability reservoirs were ranked based on their efficacy.

scholarly journals Study on the response characteristics of oil wells after deep profile control in low permeability fractured reservoirs

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 832-838 ◽  
Author(s):  
Lijun Lin ◽  
Wei Lin
Keyword(s):  
Fractured Reservoirs ◽  
Oil Production ◽  
Oil Wells ◽  
Low Permeability ◽  
Response Characteristics ◽  
Well Pattern ◽  
Profile Control ◽  
Deep Profile ◽  
Low Permeability Reservoirs ◽  
Oilfield Development

AbstractThe rhombus inverted nine-spot well pattern is often adopted in low permeability oilfield development, which has the advantage of high oil production rate and flexible adjustment. Due to the strong heterogeneity of the low permeability reservoirs, the oil wells along the fracture direction are heavily water-flooded and the water cut rises quickly, and the oil wells on both sides of fractures have no response to water injection. Hence, deep profile control is an effective way to solve this kind of plane contradiction, and is widely applied in the low permeability oilfield development. However, because of the asymmetry of the rhombus inverted nine-spot well pattern and the heterogeneity of the low permeability reservoirs, there are differences in the response characteristics of oil wells at different locations after deep profile control. In this paper, combined with physical experiments and numerical simulations, we analyzed oil increment, the distribution of streamlines and slugs of wells at different locations before and after deep profile control, and evaluated the response characteristics of oil wells of rhombus inverted nine-spot well pattern after deep profile control in low permeability fractured reservoirs. It is concluded that the effect of increasing oil production of the side wells is better than that of the angle wells after deep profile control, and the response sequence is side well, angle well in short axis, and angle well in long axis, which is also verified by the practical results of deep profile control in Daqing Oilfield.

scholarly journals ASSESSMENT OF THE CONDITION OF THE NEAR-WELLBORE ZONE OF REPAIRED WELLS BY THE SKIN FACTOR

2021 ◽  
Author(s):  
Sudad H AL-Obaidi ◽  
Chang WJ ◽  
Patkin AA
Keyword(s):  
Western Siberia ◽  
Oil And Gas ◽  
Skin Effect ◽  
Objective Assessment ◽  
Oil Production ◽  
Low Permeability ◽  
Formation Zone ◽  
Production Wells ◽  
Exploration And Production ◽  
Low Permeability Reservoirs

Production wells that have penetrated low-permeability reservoirs do not provide adequate oil production due to the degraded condition of the near-wellbore zones of the reservoir. Objective assessment of the condition of the near-wellbore formation zone of exploration and production wells by determining the magnitudes and values of skin effects using well tests allows timely implementation of measures to increase the productivity of wells and oil production.In this article, the following aspects of difficult-to-recover oil production were examined:- The analysis of the dependence of well productivity on the magnitude and significance of the skin effect, in order to assess the condition of the bottomhole formation zone for further planning and implementation of oil and gas inflow stimulation measures;- The influence of the magnitude and significance of the skin effect on the condition of the bottomhole formation zone on the experience of developing exploration wells penetrated into low-permeability formations in the fields of Western Siberia;- Criteria (based on the value and magnitude of the skin effect) for selecting methods of stimulating the bottomhole formation zone to increase the productivity of low-rate wells.

Application of the Imitation Horizontal well Technique in the Development of Low Permeability Reservoirs

2013 ◽  
Vol 734-737 ◽  
pp. 1350-1353
Author(s):  
Yan Dong ◽  
An Zhu Xu
Keyword(s):  
Horizontal Well ◽  
Influence Factors ◽  
Oil Production ◽  
Low Permeability ◽  
Daily Production ◽  
Drainage Radius ◽  
Well Pattern ◽  
Single Well ◽  
Lower Permeability ◽  
Low Permeability Reservoirs

The fluid flowing resistance increase and the water absorbing capacity reduce due to the threshold pressure gradient and media deformation of the low permeability reservoirs in the course of development. The oil production of vertical wells may decrease fastly and the controlled reservers are hard to recover. The development effects are not satisfied. Through great fracturing measurements create many fractures, and fractures extended along the direction of well line, the long fracture channels were formed like horizontal well segments. This kind of long fracture was called as horizontal segment of imitation horizontal well. It can broad drainage radius in production well and increase controlled reserves and daily oil production of single well. In this paper, the influence factors of the low permeablity reservoirs development by imitation horizontal wells were analysised. Through well pattern, well distance, line distance, injector and producer parameters and fracturing parameters of imitation horizontal well optimization, drainage radius in lower permeability reservoirs can be reached to 200 meters, the daily production in single well can increase two times of that before, and the production result was improved greatly in lower permeability reservoirs development.

A New Study of China's Advanced Water Injection Technology for Low-Permeability Reservoirs

2013 ◽  
Vol 273 ◽  
pp. 55-59
Author(s):  
Leng Tian ◽  
Ming Xu Ma ◽  
Shun Li He
Keyword(s):  
New Technology ◽  
Water Injection ◽  
Pressure Rise ◽  
Oil Production ◽  
Recent Decade ◽  
Simple Equation ◽  
Low Permeability ◽  
Injection Technology ◽  
Low Permeability Reservoirs

China has large volumes of low-permeability reservoirs, distributed widely in the Ordos, Karamay and Songliao basins. In the recent decade, a new technology called advanced water injection (AWI), which is to inject water into formation to increase or maintain pressure for 3 to 6 months before oil production, has been applied to efficiently develop low-permeability reservoirs. This paper studies mechanisms and applications of AWI in China. Especially, its resent application in Xifeng oilfield has been described in detail. Most importantly, this paper proposes a simple equation to calculate optimal injected volume of water and pressure rise.

Application of Hydraulic Fracturing Candidate Selection Leading to Oil Production Boost from Multi-Layered, Low-Permeability Reservoirs: A Successful Case Study in Thailand

2021 ◽  
Author(s):  
Marut Wantawin ◽  
Thum Sirirattanachatchawan ◽  
Theerapat Suppachokinirun ◽  
Kittithuch Hnuruang ◽  
Sorawee Rongdechprateep ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Success Rate ◽  
Oil Production ◽  
Candidate Selection ◽  
Production Performance ◽  
High Rate ◽  
Hydraulic Fractures ◽  
Low Permeability ◽  
Selection Methodology ◽  
Low Permeability Reservoirs

Abstract Hydraulic fracturing activities implemented in Sirikit onshore oilfield of Thailand over a decade. Before 2018, the variation in post-fracturing production performance resulted in about 50% stimulation success rate. This outcome posted a big challenge to maintain project momentum. Hence, the candidate selection methodology was developed in-house which recommends "suitable" reservoirs. Using selection criteria, the multi-layered, low permeability reservoirs were selected for the 2018-19 Hydraulic Fracturing Campaign. Production analysis was conducted using the information gathered from past hydraulic fracturing campaigns. Reservoir Index (RI) was invented to distinguish the subsurface quality by formation permeability, thickness, pressure, and fluid properties. Together with the Fold of Increase (FOI) owing to hydraulic fracturing, a performance-based relationship was created which can categorize suitable reservoirs based on their RI ranges. This method has been applied to newly drilled wells during 2018. In the end, there were 13 wells selected to perform 28 hydraulic fracturing stages. The 2018-2019 Hydraulic Fracturing Campaign at Sirikit Oilfield was planned and executed. Post-fracturing production tests showing significant improvement. Some wells resulted in excellent oil production rate naturally, while some maintained high rate by artificial lift. According to post-campaign analysis, hydraulic fractures were proved to connect multiple layers of satisfactory flow capacity. In addition, well angle and stress direction accommodated the placement and orientation of multiple hydraulic fractures. As a result, the number of hydraulic fracturing stages that achieved economic production tests improved to 75% success rate. Hydraulic fracturing results from the past were fully utilized in order to achieve sustainable production improvement, thus driving continuous stimulation activities in the future. The candidate selection methodology has shaped up a candidate selection workflow that pointed out success criteria and avoided those that may lead to failure, which proved to be successful in one of the most complex fields in Thailand.

scholarly journals The efficiency of gas injection into low-permeability multilayer hydrocarbon reservoirs

2021 ◽  
Author(s):  
Sudad H Al-Obaidi ◽  
Hofmann M ◽  
Khalaf FH ◽  
Hiba H Alwan
Keyword(s):  
Hydraulic Fracturing ◽  
Oil Recovery ◽  
Gas Injection ◽  
Oil Production ◽  
Recovery Factor ◽  
Low Permeability ◽  
Compositional Model ◽  
Multistage Hydraulic Fracturing ◽  
Low Permeability Reservoirs ◽  
Working Agent

The efficiency of gas injection for developing terrigenous deposits within a multilayer producing object is investigated in this article. According to the results of measurements of the 3D hydrodynamic compositional model, an assessment of the oil recovery factor was made. In the studied conditions, re-injection of the associated gas was found to be the most technologically efficient working agent. The factors contributing to the inefficacy of traditional methods of stimulating oil production such as multistage hydraulic fracturing when used to develop low-permeability reservoirs have been analysed. The factors contributing to the inefficiency of traditional oil-production stimulation methods, such as multistage hydraulic fracturing, have been analysed when they are applied to low-permeability reservoirs. The use of a gas of various compositions is found to be more effective as a working agent for reservoirs with permeability less than 0.005 μm2. Ultimately, the selection of an agent for injection into the reservoir should be driven by the criteria that allow assessing the applicability of the method under specific geological and physical conditions. In multilayer production objects, gas injection efficiency is influenced by a number of factors, in addition to displacement, including the ratio of gas volumes, the degree to which pressure is maintained in each reservoir, as well as how the well is operated. With the increase in production rate from 60 to 90 m3 / day during the re-injection of produced hydrocarbon gas, this study found that the oil recovery factor increased from 0.190 to 0.229. The further increase in flow rate to 150 m3 / day, however, led to a faster gas breakthrough, a decrease in the amount of oil produced, and a decrease in the oil recovery factor to 0.19. Based on the results of the research, methods for stimulating the formation of low-permeability reservoirs were ranked based on their efficacy.

ASSESSMENT OF OIL WELL PRODUCTIVITY IN LOW-PERMEABILITY RESERVOIRS IN THE FIELDS OF EASTERN SIBERIA

2017 ◽  
pp. 30-36
Author(s):  
R. V. Urvantsev ◽  
S. E. Cheban
Keyword(s):  
Oil Recovery ◽  
Large Scale ◽  
Oil And Gas ◽  
Oil Extraction ◽  
Low Permeability ◽  
Oil Well ◽  
Eastern Siberia ◽  
Development Costs ◽  
Traditional Fields ◽  
Low Permeability Reservoirs

The 21st century witnessed the development of the oil extraction industry in Russia due to the intensifica- tion of its production at the existing traditional fields of Western Siberia, the Volga region and other oil-extracting regions, and due discovering new oil and gas provinces. At that time the path to the development of fields in Eastern Siberia was already paved. The large-scale discoveries of a number of fields made here in the 70s-80s of the 20th century are only being developed now. The process of development itself is rather slow in view of a number of reasons. Create a problem of high cost value of oil extraction in the region. One of the major tasks is obtaining the maximum oil recovery factor while reducing the development costs. The carbonate layer lying within the Katangsky suite is low-permeability, and its inventories are categorised as hard to recover. Now, the object is at a stage of trial development,which foregrounds researches on selecting the effective methods of oil extraction.

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