Journal
PETROLEUM SCIENCE AND TECHNOLOGY
Volume 40, Issue 15, Pages 1829-1840Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10916466.2022.2032150
Keywords
ScCO2 flooding; scaling trend; scale inhibitor; CaCO3 crystal
Funding
- Shaanxi provincial education department [21JK0984]
- natural science basic research project of Shaanxi province [2021JQ-633]
- innovation and entrepreneurship training program for college students of Shaanxi province [S202110719016, S202110719098]
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Supercritical CO2 flooding is used for enhanced oil recovery but it causes scaling problems in the reservoir. This article analyzes the water quality before and after flooding and studies the scale inhibition performance and mechanism of different inhibitors on calcium carbonate in the produced water.
In order to enhance oil recovery, supercritical CO2 (scCO(2)) flooding has been applied in many oilfields to extract oil and gas post primary recovery. However, it causes serious scaling problems in the reservoir, oil well and production tubing. In this article, the produced water quality before and after scCO(2) flooding in carbonate reservoirs are analyzed. The scaling trend of produced water before and after scCO(2) flooding was calculated by using the Davis-stiff saturation index and Ryznar stability index methods. Static experiments and scanning electron microscope (SEM) are used to study the scale inhibition performance and mechanism of HEDP, ATMP, MA-AA, and PAA on CaCO3 in produced water before and after scCO(2) flooding. The results show that after scCO(2) flooding, the quality of produced water changes obviously, thus the scaling trend of produced water increases, the growth of CaCO3 crystal is affected and the scale inhibition efficiency of conventional scale inhibitors decreases.
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