Study on air foam flooding technology to enhance oil recovery of complex fault block reservoir by water injection

In the later waterflooding sandstone reservoir, there are many serious development contradictions, especially in the aspects of water breakthrough and heterogeneous development. Based on the laboratory experiments, numerical simulation research on historical match of the low temperature oxidation kinetics model, the injection mode, foaming agent concentration, gas to liquid ratio, steam injection rate and other key parameters of air-foam flooding were carried out. The results show that, air foam flooding technology integrated comprehensive effect of low-temperature oxidation, air flooding and foam flooding, which enhance oil recovery nearly 8% by block the thief layer effectively and improving the swept volume. Air-foam flooding technology also can reduce the amount of water injection and water production, which improved the utilization rate of water resources and reduced output liquid processing cost. This technology shows its broad prospect of application and can provide reference for similar reservoirs.

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Asynchronous Injection-Production Process: A Method to Improve Water Flooding Recovery in Complex Fault Block Reservoirs

Mathematical Problems in Engineering ◽

10.1155/2020/5207430 ◽

2020 ◽

Vol 2020 ◽

pp. 1-7

Author(s):

Shibao Yuan ◽

Rui Wang ◽

Haiyan Jiang ◽

Qing Xie ◽

Shengnan Chen ◽

...

Keyword(s):

Production Process ◽

Oil Recovery ◽

Water Injection ◽

Central Area ◽

Water Flooding ◽

Production Stage ◽

Fault Block ◽

Complex Fault ◽

Well Pattern ◽

Remaining Oil

The complex fault block reservoir has the characteristics of small area and many layers in vertical. Due to the influence of formation heterogeneity and well pattern, the situation that “water fingering is serious with water injection, on the contrary, driving energy is low” frequently occurs in water flooding, which makes it difficult to enhance oil recovery. Asynchronous injection-production (AIP) process divides the conventional continuous injection-production process into two independent processes: injection stage and production stage. In order to study oil recovery in the fault block reservoir by AIP technology, a triangle closed block reservoir is divided into 7 subareas. The result of numerical simulation indicates that all subareas have the characteristic of fluid diverting and remaining oil in the central area is also affected by injected water at injection stage of AIP technology. Remaining oil in the central area is driven to the included angle and border area by injected water and then produced at the production stage. Finally, the oil recovery in the central area rises by 5.2% and in the noncentral area is also increased in different levels. The AIP process can realize the alternative change of reservoir pressure, change the distribution of flow field, and enlarge the swept area by injected water. To sum it up, the AIP process is an effective method to improve the oil recovery in complex fault-block reservoir by water flooding.

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Mechanistic study of cyclic water injection to enhance oil recovery in tight reservoirs with fracture deformation hysteresis

Fuel ◽

10.1016/j.fuel.2020.117677 ◽

2020 ◽

Vol 271 ◽

pp. 117677 ◽

Cited By ~ 3

Author(s):

Lijun Liu ◽

Yongzan Liu ◽

Jun Yao ◽

Zhaoqin Huang

Keyword(s):

Oil Recovery ◽

Water Injection ◽

Mechanistic Study ◽

Fracture Deformation ◽

Tight Reservoirs ◽

Enhance Oil Recovery ◽

Deformation Hysteresis

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Nitrogen Foam Flooding Pilot Test for Controlling Water Cut and Enhance Oil Recovery in Conventional Heavy Oil Reservoirs of China Offshore Oilfield

10.2118/165808-ms ◽

2013 ◽

Cited By ~ 4

Author(s):

Kuiqian Ma ◽

Xiaofei Jia ◽

Jing Yang ◽

Yingxian Liu ◽

Zongbin Liu

Keyword(s):

Oil Recovery ◽

Heavy Oil ◽

Oil Reservoirs ◽

Pilot Test ◽

Nitrogen Foam ◽

Heavy Oil Reservoirs ◽

Water Cut ◽

Foam Flooding ◽

Enhance Oil Recovery

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Laboratory Evaluation on Foaming Agent for High-Temperature and High-Salinity Reservoir

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.884-885.82 ◽

2014 ◽

Vol 884-885 ◽

pp. 82-86

Author(s):

Ji Chao Fang ◽

Cai Li Dai ◽

Kai Wang ◽

Qin Fang Ding ◽

Si Yu Wang

Keyword(s):

High Temperature ◽

Oil Recovery ◽

Foam Stability ◽

Pressure Rise ◽

Laboratory Evaluation ◽

Total Recovery ◽

Foaming Agent ◽

Reservoir Conditions ◽

Foam Flooding ◽

Enhance Oil Recovery

In order to further enhance oil recovery (EOR) of the high temperature and high salt oil fields by foam flooding, one foaming agent was screened by airflow method. The influence of oil-water and pressure on foamability and stability were evaluated,and oil displacement experiment was also conducted. The results show that CS-1 foaming agent has better foamability and stability than the others under the reservoir conditions (Temperature 110 °C, Salinity 11.52×104 mg/L, Ca2+&Mg2+ 7654 mg/L). The foam stability will be better as the pressure rise or be worse when it met the crude oil. Oil recovery was improved by 4.13% after waterflood and the total recovery is 60.75%.

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