Study on Barium Sulfate Scale Model Based on Chemical Kinetics

doi:10.11885/j.issn.1674-5086.2014.01.08.04

Abstract

Abstract:

Reaction of ions in porous media were not the same as in common water solution Diffusion and reaction coefficients
in porous media had to be calculated by fitting core scale model with measured outlet barium concentration in core flooding
test. The original solvers of both core and formation scale model made the assumptions that barium and sulfate ion ratio should
be far less than 1，which largely restricted the model′s application. By using Lobatto and Newton methods to solve core scale
model without the assumption upon ion ratio we obtained the formation scale model，and modified the coefficient of second
order term in the control equation. We also studied the effects of different dimensionless diffusion coefficients，dimensionless
reaction coefficients and influence of ion ratios on impedance coefficient of formation scale model when injecting low sulfate
seawater. The results showed that low sulfate seawater could greatly lower the ion ratio and would decrease the impedance
coefficient greatly，and that with the same percentage of decrease in ion ratio and dimensionless reaction coefficient，the former
would result in greater reduction of impedance coefficient.

Key words: water flooding, barium sulfate, ion ratio, scale model, impedance coefficient

CLC Number:

TE319

LI Hongjian1*, CHEN Man1, SHI Xiangchao1, TANG Xin2, WANG Deyu2. Study on Barium Sulfate Scale Model Based on Chemical Kinetics[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.01.08.04.

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