Modeling of CO2 Flooding and Huff and Puff Considering Molecular Diffusion and Stress-Dependent Deformation in Tight Oil Reservoir

2017 ◽  
Author(s):  
T.H. Kim ◽  
J. Cho ◽  
K.S. Lee
Keyword(s):  
Molecular Diffusion ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Co2 Flooding ◽  
Tight Oil Reservoir ◽  
Stress Dependent

The Study of CO2 Flooding of Horizontal Well with SRV in Tight Oil Reservoir

2014 ◽  
Author(s):  
H.. Wang ◽  
X.. Liao ◽  
X.. Zhao ◽  
H.. Ye ◽  
X.. Dou ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Ordos Basin ◽  
Gas Injection ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Co2 Flooding ◽  
Vertical Wells ◽  
Injection Volume ◽  
Fractured Horizontal Well ◽  
Tight Oil Reservoir

Abstract As one kind of unconventional reservoirs, tight oil reservoir has become one of the main forces of oil reserves and production growth. The characteristics of tight oil reservoir are low porosity and ultra-low permeability, thus stimulated reservoir volume (SRV) should be conducted whether applying the mode of vertical wells or horizontal wells production. Tight oil reservoir is mostly developed by natural depletion or water flooding recently, but the problems are existed, including low recovery factor with natural depletion and the difficulty of water injection. To further improve the development effect of tight oil reservoir, CO2 flooding is proposed. Based on chang-8 tight oil reservoir in Ordos Basin, an oil sample of typical block is selected. The PVT experiments are conducted. The compositional numerical model of five-spot pattern is established with a horizontal well in the middle and 4 vertical wells on the edge. Based on the model, several CO2 flooding scenarios of horizontal well with different completion measures are studied. Furthermore, parameters such as the formation pressure, production rate, shut-in gas-oil ratio and total gas injection volume are optimized. The results of this study show that the recovery factor of horizontal well with SRV is higher than those of horizontal well and conventional fractured horizontal well. The minimum miscible pressure (MMP) and the total gas injection volume are two key factors of CO2 flooding effect. CO2 flooding of volume fractured horizontal well in tight oil reservoir can not only improve oil recovery, but also realize CO2 geological sequestration. It plays dual benefits of economy and environment. The study gives new ideas of CO2 flooding with volume fractured horizontal well for the Ordos Basin tight oil reservoir. It can be helpful for rapid and effective development of tight oil reservoirs in Ordos Basin.

Optimization of Gas Channel Controlling Technique During Co2 Immiscible Flooding in Normal Pressure Tight Oil Reservoir——A Case Study of Honghe Chang 8 Reservoir in South Ordos Basin

2021 ◽  
Author(s):  
Ting Xu ◽  
Yi Wei
Keyword(s):  
Large Scale ◽  
Normal Pressure ◽  
Small Scale ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Co2 Flooding ◽  
Tight Reservoir ◽  
Starch Gel ◽  
Tight Oil Reservoir ◽  
Gas Channeling

Abstract Tight oil reservoir is commonly recognized to be difficult to supply the formation energy. Tight oil reservoir in Ordos basin is characterized to be continental sedimentation, strong heterogeneity, normal pressure (0.9), low reserve abundance, imperative to supply the displacing energy. CO2 have good injection and high displacing efficiency for extra-low permeability reservoir, which provides the reference for exploring the effective development mode in tight reservoir. Influencing by complex fracture and hydraulic fracturing, as CO2 flooding is conducted in tight oil reservoir, gas channeling phenomenon is very serious, displacing energy is difficult to be utilized. To enlarge CO2 sweep efficiency, how we can effectively control CO2 channeling becomes the first important issue in energy supplying development of normal pressure tight reservoir. In the paper, a case of Honghe Chang 8 tight oil reservoir was carried out. Medium-large and medium-small scale fractures were artificial fabricated in natural crop cores according to G&G understanding. In different fracture openings models, two-stage blocking experiments with CO2 flooding were operated with high-strength starch gel and weak-strength ethylenediamine. Slug combination, volume and sequence were evaluated and by numerical simulation, blocking strength were defined to reflect the plugging effect in the experiment. Then build up well group numerical simulation model, characterizing the complex fracture network. Blocking sites and volume of plugging agents were analyzed and optimized. Two-stage blocking technique was determined in the fracture developed tight reservoir during CO2 flooding. Research results indicate it is priority to control the gas channeling of medium-large scale fractures with sufficient volume of the starch gel. As CO2 flooding is performed, gas starts to break through, followed by small volume ethylenediamine to mitigate gas channeling. Numerical simulation shows that firstly fully controlling gas channeling from medium-large scale fracture along with principal stress, then injecting plugging agent from the injection well, being located in 1/3~1/2 of well space to treat medium-small scale fractures with the best production stimulation. Starch gel volume is determined by medium-large scale fractures pore volume(PV), while low concentration starch gel and ethylenediamine volume is optimized to be half of the medium-small scale fracture PV, in which PV of fracture permeability lower than 200×10-3μm2 determine ethylenediamine volume. Generally, plugging agent would be more than 1500m3 for a pair of I-P wells. With low cost CO2 source, CO2 flooding is expected to be one of the important development modes for normal pressure tight oil reservoir. During CO2 immiscible flooding, gas channel controlling technique plays decisive roles in ensuring successful development. Research results are not only advisable for the Ordos normal pressure tight reservoir development, but also for the similar tight reservoir in the world.

The Study of CO2 Flooding of Horizontal Well with SRV in Tight Oil Reservoir

2014 ◽  
Author(s):  
Huan Wang ◽  
Xinwei Liao ◽  
Xiaoliang Zhao ◽  
Heng Ye ◽  
Xiangji Dou ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Co2 Flooding ◽  
Tight Oil Reservoir

Performance evaluation of CO2 flooding process in tight oil reservoir via experimental and numerical simulation studies

Fuel ◽  
2019 ◽  
Vol 236 ◽  
pp. 730-746 ◽  
Author(s):  
Xiang Zhou ◽  
Qingwang Yuan ◽  
Yizhong Zhang ◽  
Hanyi Wang ◽  
Fanhua Zeng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Performance Evaluation ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Simulation Studies ◽  
Co2 Flooding ◽  
Tight Oil Reservoir

Synthetic model for evaluating CO2 flooding in tight oil reservoir

2021 ◽  
pp. 1-12
Author(s):  
Xiaolong Chai ◽  
Mengyuan Zhang ◽  
Leng Tian ◽  
Zhuangming Shi ◽  
Hengli Wang ◽  
...  
Keyword(s):  
Tight Oil ◽  
Oil Reservoir ◽  
Co2 Flooding ◽  
Synthetic Model ◽  
Tight Oil Reservoir

Hydraulic Fracturing of Ultrahigh Stress Tight Oil Reservoir - A Case Study of Yumen Oilfield in China

2016 ◽  
Author(s):  
Peng Yi ◽  
Weng Dingwei ◽  
Xu Yun ◽  
Wang Liwei ◽  
Lu Yongjun ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Tight Oil ◽  
Oil Reservoir ◽  
Tight Oil Reservoir
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