Investigation of the effect of diethylene triamine pentaacetic acid chelating agent as an enhanced oil recovery fluid on wettability alteration of sandstone rocks

被引：0

作者：

Keradeh M.P. ^{[1
]}

Tabatabaei-Nezhad S.A. ^{[1
]}

机构：

[1] Faculty of Petroleum and Natural Gas Engineering, Sahand University of Technology, Tabriz

来源：

Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2023年 / 50卷 / 03期

关键词：

DTPA chelating agent; enhanced oil recovery; spontaneous imbibition; wettability alteration; Zeta potential;

D O I：

10.11698/PED.20220682

中图分类号：

学科分类号：

摘要：

This study used the diethylene triamine pentaacetic acid (DTPA)-sea water (SW) system to change the sandstone rock wettability and increase oil recovery, and carried out wettability measurement, Zeta potential measurement and spontaneous imbibition experiments. The 5% DTPA-SW solution changed the rock-oil contact angle from 143° to 23°, and decreased the Zeta potential from −2.29 mV to −13.06 mV and made the rock surface charge more negative, finally altered the rock wettability towards a strongly water-wet state from oil-wet state. The presence or absence of potential determining ions (Ca2+, Mg2+, SO42−) in the solution did not affect the performance of DTPA regarding the change in the wettability. However, by tripling the concentration of these ions in the solution, the performance of 5% DTPA-SW solution in changing wettability was impaired. Spontaneous imbibition tests also showed that the 5% DTPA-SW solution increased oil recovery up to 39.6%. The optimum mass fraction of DTPA for changing sandstone wettability is 5%. © 2023 Science Press. All rights reserved.

引用

页码：594 / 602

页数：8

共 60 条

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