Experimental study on the characteristics, injection damage, and oil displacement efficiency of alkali-free ternary composite flooding extracted wastewater

Bin Huang, Xing Shu, Xiaoying Liu, Cheng Fu, Jingang He and Xue Zhang

Energy, 2025, vol. 332, issue C

Abstract: Suspended solids, oil droplets and residual polymers can easily lead to the blockage of the produced water reinjection reservoir. However, its influence on the permeability damage mechanism, the recovery degree after damage, and the optimization of the efficiency of alkali-free ternary oil displacement remains unclear. In this study alkali-free ternary produced water quality based on analysis of fixed permeability loss classification standard, evaluation of the impact on the core permeability mechanism, establish reinjection chart. An innovative evaluation method for the recovery mechanism after core permeability loss was proposed. There was transitional blockage, and the feasibility of preparing a polymer system with alkali-free ternary produced water for reinjection oil displacement was clarified. Experiments show that for 200 mD cores, the risk of reinjection is significant when the oil content is ≥ 60 mg/L or the suspended solids content is ≥ 60 mg/L. The permeability of the 1000 mD core recovered by 4.95 % and 6.65 % after flushing, with the most significant effect. The polymer preferred system formulated with the produced water increased the recovery rate by approximately 17 %, confirming its good reservoir compatibility and resource reuse potential.

Keywords: Wastewater reinjection; Injection damage; Displacement efficiency; Alkali-free ternary composite flooding; Low permeability reservoir (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544225029202
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:332:y:2025:i:c:s0360544225029202

DOI: 10.1016/j.energy.2025.137278

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().