Full
Outline
To address the challenges of limited downhole space in single‑well injection‑production systems and the difficulty in efficiently separating small‑diameter oil droplets from oil‑water mixtures，miniature hydrocyclones with better separation performance for small oil droplets were selected.Combining computational fluid dynamics （CFD） numerical simulation and experimental methods，the effects of produced fluid physical parameters and operational parameters of miniature hydrocyclones on downhole oil‑water separation performance were analyzed，and their adaptability under different conditions was investigated.The results show that when the oil concentration in the produced fluid is set to 2%，5%，8%，10%，and 13%，the corresponding optimal overflow split ratios are 20%，23%，26%，28%，and 31%，respectively；when the oil density is 800 kg/m3，the miniature hydrocyclone demonstrates good separation performance across the oil concentration range of 2% to 13%；when the oil density is 850 kg/m3 and 900 kg/m3，the optimal adapted produced fluid oil concentration ranges for the miniature hydrocyclone are below 8% and below 5%，respectively.This study can provide references for the efficient application of miniature hydrocyclones in downhole oil‑water separation.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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