Asphaltene Deposition and its Effects on Production Performances in the Development of Oil Field by CO2 Flooding: A Numerical Simulation Assessment

2010 ◽  
Author(s):  
Binshan Ju ◽  
Xiaofeng Qiu ◽  
Jishun Qin ◽  
Xinglong Chen ◽  
Tailiang Fan
Keyword(s):  
Numerical Simulation ◽  
Oil Field ◽  
Co2 Flooding ◽  
Asphaltene Deposition

scholarly journals Asphaltene Deposition during CO2 Flooding in Ultralow Permeability Reservoirs: A Case Study from Changqing Oil Field

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Li Rong-tao ◽  
Liao Xin-wei ◽  
Zou Jian-dong ◽  
Gao Chang-wang ◽  
Zhao Dong-feng ◽  
...  
Keyword(s):  
Adverse Effects ◽  
Injection Rate ◽  
Oil Field ◽  
Formation Damage ◽  
Co2 Flooding ◽  
Asphaltene Precipitation ◽  
Asphaltene Content ◽  
Asphaltene Deposition ◽  
Ultralow Permeability

Asphaltene deposition is a common phenomenon during CO2 flooding in ultralow permeability reservoirs. The deposited asphaltene occupies the pore volume and decreases permeability, resulting in serious formation damage and pore well productivity. It is urgent to investigate the asphaltene deposition mechanisms, adverse effects, and preventive measures. However, few asphaltene deposition investigations have been systematically conducted by now. In this research, the asphaltene precipitation mechanisms and adverse effects were comprehensively investigated by using experimental and numerical methods. To study the effects of pressure, asphaltene content, and temperature on asphaltene precipitation qualitatively and quantitatively, the microscope visible detection experiment and the PVT cell static experiment were firstly conducted. The adverse effects on porosity and permeability resulted from asphaltene deposition were also studied by the core flooding experiment. Secondly, simulation models of asphaltene precipitation and deposition were developed and validated by experimental data. Finally, a case study from Changqing oil field was presented to analyze the asphaltene deposition characteristic and preventive measures. The experimental results showed that the asphaltene precipitation increases with the increased pressure before reaching the minimum miscible pressure (MMP) and gets the peak value around the MMP, while decreases slowly. The asphaltene precipitation increases with the increased temperature and asphaltene content. The variation trend of adverse effects on porosity and permeability resulted from asphaltene deposition is similar to that of asphaltene precipitation under the influence of pressure, asphaltene content, and temperature. The case study shows that the water-altering-gas (WAG) with high injection rate suffers more serious asphaltene deposition compared with the WAG with low injection rate, for the asphaltene precipitation increases as the increased pressure before reaching the MMP. The CO2 continuous injection with high injection rate is the worst choice, for low sweep efficiency and the most severe formation damage. Thus, the WAG with optimal injection rate was proposed to maintain well productivity and to reduce formation damage resulted from asphaltene deposition during developing ultralow permeability reservoirs.

Study on Numerical Simulation and Performance of the Secondary Throttle Choke Used in the Oil Field

2013 ◽  
Vol 712-715 ◽  
pp. 1201-1204
Author(s):  
Hai Feng Zhao ◽  
Yan Xu
Keyword(s):  
Numerical Simulation ◽  
Pressure Change ◽  
Simulation Method ◽  
Differential Pressure ◽  
Oil Field ◽  
Pressure Curve ◽  
Flow Pressure ◽  
Flow Changes ◽  
And Performance ◽  
Main Factor

The numerical simulation method is adopted to calculate the flow field of the secondary throttle choke used in the oil field. The relationships among the flow of the secondary throttle choke, differential pressure and diameters are studied. The results of numerical simulation coincide with the experiment values, which verify that the method is correct. The results show that the flow increases with the increasing of differential pressure of the throttle choke at both ends, but the increment of the flow gradually decreases. The structure could maintain the flow not to change basically when differential pressure change in a certain scope. When the throttle diameter turns out to be small, the flow decreases, and flow-pressure curve gradually becomes aclinic. Compared with the first-class throttle diameter, the second-class throttle diameter is the main factor which effects flow changes.

Numerical Simulation Study on Hei47 Block in the Daqingzijing Oilfield

2013 ◽  
Vol 868 ◽  
pp. 15-19
Author(s):  
Xing Hua Zhuang ◽  
Da Hong Zhang ◽  
Jun Xie
Keyword(s):  
Numerical Simulation ◽  
Oil Field ◽  
The West ◽  
3D Geological Modeling ◽  
Production Ratio ◽  
Reservoir Development ◽  
Development Scheme ◽  
Black Oil ◽  
Remaining Oil ◽  
Injection Region

The Hei47 block, typical tectonic reservoir of the Daqingzi oil field, the west fault of which has great influences on distribution of the remaining oil. Basing on the foundation of 3D geological model of Hei47 block, using the black oil E100 of ECLIPSE software to build the numerical simulation, we found that the remaining oil distribute in the non－injection region，and the peak area is mainly near the west fault.By means of integration of 3D geological modeling and reservoir numerical simulation technology，we can forecast the results of different injection-production ratio and production speed, and choose the best reservoir development scheme. This can be fine guidances for oilfields to establish the potential solutions and improve the recovery ratio.

Development of a Correlation Between Performance of CO2 Flooding and the Past Performance of Waterflooding in Weyburn Oil Field

2007 ◽  
Vol 22 (02) ◽  
pp. 260-264 ◽  
Author(s):  
Koorosh Asghari ◽  
Mingzhe Dong ◽  
Jessie Shire ◽  
Tom Jordan Coleridge ◽  
Janelle Nagrampa ◽  
...  
Keyword(s):  
Oil Field ◽  
Co2 Flooding ◽  
Past Performance ◽  
The Past
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