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Outline
To address the effective sealing of lost fish boreholes in old wells within gas storage zones，a high‑pressure abrasive jet erosion perforation method was developed.Experimental studies on abrasive jet erosion of lost fish drill pipes were conducted，with perforation time and hole diameter as evaluation indicators.The effects of jet parameters and abrasive parameters on perforation performance were analyzed，and the maximum standoff distance diagrams under different jet pressures were obtained.Results show that different abrasives exhibit varying perforation efficiencies：silicon carbide>ceramic particles>quartz sand，with silicon carbide recommended for its higher hardness.Under the same jet pressure，abrasive particle size （40~60 mesh） and volume fraction （6%~8%） significantly affect perforation quality.Reducing standoff distance and increasing pump pressure are critical for improving efficiency.Erosion efficiency decreases with increasing jet angle （not exceeding 25°）.Abrasive jet perforation effectiveness declines with standoff distance，with maximum standoff distances predicted between 24.7~42.5 cm at 10~30 MPa.The method can perforate ⌀127 mm drill pipe bodies in 2~4 minutes and tool joints in 10~12 minutes，creating holes of 11~26.9 mm diameter.This study validates the feasibility of high‑pressure abrasive jet erosion for lost fish perforation，providing theoretical and methodological guidance for sealing complex old wells in gas storage.
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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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