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Title:
Process, mechanism and impacts of scale formation in alkaline flooding by a variable porosity and permeability model
Author: Zhang Z(张珍); Li JC(李家春)
Source: ACTA MECHANICA SINICA
Issued Date: 2016
Volume: 32, Issue:3, Pages:406-421
Abstract: In spite of the role of alkali in enhancing oil recovery (EOR), the formation of precipitation during alkaline-surfactant-polymer (ASP) flooding can severely do harm to the stratum of oil reservoirs, which has been observed in situ tests of oil fields such as scale deposits found in oil stratum and at the bottom of oil wells. On the other hand, remarkable variation of stratum parameters, e.g., pore radius, porosity, and permeability due to scale formation considerably affects seepage flow and alkaline flooding process in return. The objective of this study is to firstly examine these mutual influential phenomena and corresponding mechanisms along with EOR during alkaline flooding when the effects of precipitation are no longer negligible. The chemical kinetic theory is applied for the specific fundamental reactions to describe the process of rock dissolution in silica-based reservoirs. The solubility product principle is used to analyze the mechanism of alkali scale formation in flooding. Then a 3D alkaline flooding coupling model accounting for the variation of porosity and permeability is established to quantitatively estimate the impact of alkali scales on reservoir stratum. The reliability of the present model is verified in comparison with indoor experiments and field tests of the Daqing oil field. Then, the numerical simulations on a 1/4 well group in a 5-spot pattern show that the precipitation grows with alkali concentration, temperature, and injection pressure and, thus, reduces reservoir permeability and oil recovery correspondingly. As a result, the selection of alkali with a weak base is preferable in ASP flooding by tradeoff strategy.
Keyword: Alkali ; Precipitation ; Chemical flood ; Permeability ; Oil recovery
Language: 英语
Indexed Type: SCI ; EI ; CSCD
Corresponding Author: Li, JC (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China.
Correspondent Email: jcli05@imech.ac.cn
DOI: 10.1007/s10409-015-0554-y
Related URLs: 查看原文
DOC Type: 期刊论文
WOS Subject: Engineering, Mechanical ; Mechanics
WOS Subject Extended: Engineering ; Mechanics
WOS Keyword Plus: Alkali ; Precipitation ; Chemical flood ; Permeability ; Oil recovery
WOS ID: WOS:000379181600006
ISSN: 0567-7718
Funder: The project was supported by the National Basic Research Program of China (Grant 2005CB221300) and the National Natural Science Foundation of China (Grant 11302234).
Rank: [Zhang, Zhen; Li, Jiachun] Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China
Department: LMFS水环境流体力学(LEM)
Classification: 二类
First Institution (Yes or Not): True
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/59516
Appears in Collections:流固耦合系统力学重点实验室(2012-)_期刊论文

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Recommended Citation:
Zhang Z,Li JC. Process, mechanism and impacts of scale formation in alkaline flooding by a variable porosity and permeability model[J]. ACTA MECHANICA SINICA,2016-01-01,32(3):406-421.
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