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Research Papers: Oil/Gas Reservoirs

Experimental Study on a New Type of Water Shutoff Agent Used in Fractured Low Permeability Reservoir

[+] Author and Article Information
Lei Zhang

Institute of Petroleum Engineering,
China University of Petroleum (East China),
Huangdao,
Qingdao 266580, China
e-mail: zhangshishishi.188@163.com

Chunsheng Pu

Institute of Petroleum Engineering,
China University of Petroleum (East China),
Huangdao,
Qingdao 266580, China
e-mail: chshpu@163.com

Shuxia Cui

Institute of Petroleum Engineering,
China University of Petroleum (East China),
Huangdao,
Qingdao 266580, China
e-mail: 15554209309@163.com

Khan Nasir

Institute of Petroleum Engineering,
China University of Petroleum (East China),
Huangdao,
Qingdao 266580, China
e-mail: n.kh55@yahoo.com

Yang Liu

Institute of Petroleum Engineering,
China University of Petroleum (East China),
Huangdao,
Qingdao 266580, China
e-mail: LY_PSQ@163.com

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received December 7, 2015; final manuscript received October 21, 2016; published online November 29, 2016. Assoc. Editor: Daoyong (Tony) Yang.

J. Energy Resour. Technol 139(1), 012907 (Nov 29, 2016) (9 pages) Paper No: JERT-15-1464; doi: 10.1115/1.4035146 History: Received December 07, 2015; Revised October 21, 2016

In order to effectively plug the fracture channeling-path in the high water cut fractured low permeability reservoir, a new type of water shutoff agent is developed by bottle tests and its injectivity and plugging performance in fractures are systematically studied by rheology and fractured core displacement experiment. The gelant consists of modified starch, dimethyl diallyl ammonium chloride, N,N′-methylene diacrylamide, and potassium persulfate, which behaves as a Newtonian with a good flowing capacity that allows its accurate positioning in the fractures. After gelatinization, the gel has high elastic modulus and viscous modulus. During the gelant injection into the fractured core, the filtration from fracture into matrix of the gelant leads to a difference between the injection volume of the gelant and the plugged fracture volume. Thus, a mathematical model for calculating filtration volume is established and applied in plugging experiment very well. After plugging, the two block cores can be tightly cemented together by the starch gel. The experiments show that the water shutoff agent and the mathematical model of filtration can be used to effectively plug the fracture channeling-path in the high water cut fractured low permeability reservoir.

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Figures

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Fig. 1

Viscosity–concentration relationship of the modified starch solution

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Fig. 2

Physical simulation experiment device

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Fig. 3

End face and profile of the core with artificial fracture

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Fig. 4

Relationship of flowing capacity and concentration of modified starch

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Fig. 5

Free radical on the chain of starch macromolecule

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Fig. 6

Microstructure of the gel (its composition is 20 g/L modified starch, 20 g/L DADMAC, 1.2 g/L cross-linking agent, and 0.5 g/L initiator)

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Fig. 7

Influence of the main agents on the gel viscosity (the concentration of cross-linking agent and initiator is 1 g/L and 0.5 g/L, respectively)

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Fig. 8

Influence of the cross-linking agent on the gel viscosity

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Fig. 9

Influence of the initiator concentration on gelation time (the composition of the gelant is 20 g/L DADMAC, 20 g/L starch, and 1.2 g/L cross-linking agent)

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Fig. 10

Rheology of the gelant

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Fig. 11

CT scanning of the gelant transportation in porous media

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Fig. 12

Viscoelasticity of the gel

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Fig. 13

Fill area of 6 mL water shutoff agent in the fracture

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Fig. 14

Breakthrough pressure of the gel in the three different fractures

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Fig. 15

Plugging effect of the starch gel on two block cores

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