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- Title
Effect of a hydrophobically associating polymer on disproportionate permeability reduction to oil and water for sandstone reservoirs.
- Authors
Xu Li; Xiaopeng Wang; Chunsheng Pu; Nasir Khan; Jingyang Pu; Shaofei Kang; Yun Bai; Kai Wang; Jing Liu
- Abstract
Because of the absence of amphiphilic, the disproportionate permeability reduction (DPR) performance of the traditional partially hydrolyzed polyacrylamide (PHPAM) or PHPAM-based gel in oil-wet sandstone reservoirs is barely satisfactory. Therefore, this study proposed a hydrophobically modified polyacrylamide (HMPAM) with amphiphilic in nature, and a series of experiments were performed on both water-wet and oil-wet sandstone core samples to investigate the DPR potential of it. According to the core flooding experiments, HMPAM flooding could reduce the water permeability of oil-wet cores by 93%, and only about 20% permeability reduction can be observed for the oil phase, showing the good DPR performance. In contrast, the traditional PHPAM had no obvious DPR effect on the oil-wet core. The big difference of DPR performance can be attributed to the gap between HMPAM and PHPAM in the adsorption capacity on sandstone surface. For oil-wet sandstones, the adsorption of HMPAM was 5.16 mg/g, while there was only 1.22 mg/g for PHPAM. The adsorption of HMPAM can narrow the pore throats and alter the wettability of the oil-wet rock surface, increasing the flow resistance of water, while hardly affecting the oil flow.
- Subjects
SANDSTONE; PERMEABILITY; OIL field flooding; ADSORPTION capacity; DRILL core analysis; PETROLEUM
- Publication
Desalination & Water Treatment, 2023, Vol 293, p276
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2023.29549