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Outline
To address the problem of pore wall instability in the fractured formation during geological drilling at Pingpo Coal Mine in Gansu Province, the mineral compositions, microstructures and pore characteristics of mud shale formation in coal measure strata were comprehensively analyzed. It is found that the clay minerals are mainly composed of illite and montmorillonite with high contents, and the degree of mineral particle cementation is low. At the same time, the large pores and medium pores account for more than 80% of the total pores volume, which is easy to cause pore wall collapse under the erosion of fluid medium. Nano materials and micro-foam agents with excellent performances were selected through laboratory experiments, and a kind of nano silicon-based micro-foam drilling fluid suitable for fractured formation drilling was developed based on the low solid content drilling fluid. The results show that the drilling fluid has a good fluidity and filtration, which can effectively suppress the deformation of coal measure strata and the collapse of pore walls, and has strong infiltration sealing performance and inhibition capabilities. Through the field application of the new drilling fluid in coal measure strata drilling, the pure drilling rate of the drilling hole was increased by 40%, the core recovery rate reached 95% and the monthly efficiency was increased by 72%, which proved that the new drilling fluid has a good wall protection and anti-collapse function in the fractured formation of coal measure strata.
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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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