| 摘要 |
In a process wherein a well is fractured using a plurality of solid particles as propping agent, the propping agent particles are color-coded so that if propping particles are subsequently produced out of one or more of the propped fractures, these produced propping particles, when recovered at the earth's surface, can, because of their color-coding, give an indication as to the nature of the problem in the fractured area.
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