Full
Outline
According to the drainage data of 7 horizontal wells in Tunlan block, the productivity characteristics of horizontal wells were analyzed. It is found that there are great differences in water production and productivity of horizontal wells. The influence of geological factors on productivity was analyzed from the aspects of coal seam buried depth, coal seam thickness and roof and floor lithology. The influence of engineering factors on productivity was analyzed from the aspects of fracturing curve characteristics, average displacement, fracturing fluid amount and sand addition. The influence of drainage factors on productivity was analyzed from the aspects of wellhead casing pressure, drainage continuity and water production. The results show that the gas production of horizontal wells is affected by the water production. In general, there is a positive correlation between the two, but too much water production will lead to a decrease in gas production. Hydrogeological conditions have an impact on the productivity of some horizontal wells. The increase of coal seam burial depth, coal seam thickness and roof mudstone thickness is conducive to the extraction of coal bed methane. The gas production of horizontal wells with low displacement fracturing is low, the fracturing fluid amount and sand addition should also be kept in a certain range, and excessive use will lead to a decrease in gas production. The descending and stable fracturing curves account for 81.4% of the horizontal well fracturing curves. The higher the proportion of the curve, the greater the gas production. In the process of drainage, the long maintenance time of the stuck pump, the decrease of the wellhead casing pressure and the high water production will reduce the gas production. The grey correlation analysis shows that the gas content of coal seam is the main controlling factor of horizontal well productivity. The research results can provide reference for the development of horizontal wells in Tunlan block.
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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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