Compatibility between Well Pattern and Fractures Orientation for Ultra-Low Permeability Reservoirs

2011 ◽  
Author(s):  
Qing-yan Xu ◽  
Zheng-ming Yang ◽  
Rong-ze Yu ◽  
Ying He
Keyword(s):  
Low Permeability ◽  
Well Pattern ◽  
Low Permeability Reservoirs

Best Practices in Development and Production Optimization of Offshore Low Permeability Reservoir

2021 ◽  
Author(s):  
Lijian Zhang ◽  
Panpan Tian ◽  
Chuanheng Xing ◽  
Ruiting Bai ◽  
Yanjun Yin ◽  
...  
Keyword(s):  
Water Injection ◽  
Liquid Extraction ◽  
Oil Wells ◽  
Production Optimization ◽  
Low Permeability ◽  
Electric Pump ◽  
Efficient Operation ◽  
Well Pattern ◽  
Geological Conditions ◽  
Low Permeability Reservoirs

Abstract The development effect of low permeability reservoirs of offshore Shahejie Formation in China is poor with fast formation pressure drop, rapid production decline and numerous abnormal wells due to the influence of low permeability, strong heterogeneity, ultra-high reservoir temperature and pressure and high wax and asphaltene content. To overcome these difficulties, this paper takes geological conditions, reservoir potential, stimulation technology and actual wells situation into consideration on the basis of the reservoir performance research, and gives full play to the integration of reservoir and mechanical recovery. A set of production enhancement and efficiency improvement technologies has been formed, including moderate periodic water injection based on pressure fluctuation theory, liquid extraction optimization for low permeability fields, modified compound plugging removal technology, small flowrate and broad width electric pump selection technology, and pump stuck early warning technique to achieve the efficient development of offshore low-permeability oilfields. Moderate periodic water injection not only makes full use of the imbibition effect to achieve the equilibrium displacement, but also avoids the water channeling in fracture area; eight main controlling factors are used to classify and evaluate the liquid extraction potential and select the well group at level-1 for the workover with the effect of daily oil increase of 42 m3; modified compound plugging removal technique completely removes the pollution and plugging of the formation and the wellbore to release the potential of the oil wells to the greatest extent and cumulative oil increase of 6 well times is expected to be 12.44×104 m3; small flowrate and broad width electric pump selection technology applied for more than 30 well times improves the adaptability of the pumps substantially and extends the pump inspection cycle to 857 days; real-time pump stuck warning technique through the dual pattern of analyzing both conventional and high-frequency data guarantees the efficient operation of oil wells. The technologies in this paper have been applied in the target low-permeability field with daily oil production of 429 m3, oil recovery rate of 1.1%, natural decline rate drop year by year and the expected recovery factor of 20.9% under current well pattern. The key technologies in this paper have improved the target reservoir development effect significantly and provided important reference significance for other offshore low-permeability reservoirs development.

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.

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.

The Study of Flowing Law of Typical well Patterns in Low Permeability Reservoirs

2013 ◽  
Vol 444-445 ◽  
pp. 338-341 ◽  
Author(s):  
Shu Ren Yang ◽  
Bi Yi Li
Keyword(s):  
Horizontal Well ◽  
Cost Effective ◽  
Simulation Method ◽  
Low Permeability ◽  
Low Permeability Reservoir ◽  
Well Pattern ◽  
Key Issues ◽  
Flow Law ◽  
Effective Development ◽  
Low Permeability Reservoirs

Low permeability reservoirs have abundant reserves, accounting for about one-third of all the reservoir storage, but the development is difficult and the recovery is low because of its poor natural property. Reasonable well pattern, well pattern parameters and fracture parameters can be effective in improving the development of low-permeability reservoir. Therefore, studying flow law of various well networks, choosing a reasonable well pattern and corresponding well parameters, are key issues of cost-effective development of low permeability reservoir. Based on extensive investigations of former researches, this paper studies the flow law of vertical well patterns and the effect of permeability differential on flow law. Adaptive study of those different kinds of well patterns has been done by numerical simulation method, including the five point well pattern, inverted seven point well pattern and the inverted nine point well pattern. Studying the typical horizontal well pattern on the flow law, comparing the characteristics of the streamlines. Choosing a reasonable form of well pattern and the well pattern parameters.

Hydroelectric simulation experimental research on fractured well pattern in low permeability reservoirs

2013 ◽  
Vol 30 (3) ◽  
pp. 294-298
Author(s):  
Yuliang Su ◽  
Guoliang Cao ◽  
Bin Yuan ◽  
Guangzhong Lyu ◽  
Wendong Wang ◽  
...  
Keyword(s):  
Experimental Research ◽  
Low Permeability ◽  
Well Pattern ◽  
Fractured Well ◽  
Low Permeability Reservoirs
Sign in / Sign up

Export Citation Format

Share Document