## 4 Results
### Dissolved Mineral Analysis Results
The water composition type in the stable production stage before and after the workover of 105 days: GC-06 is Na-Cl-HCO\({}_{3}\), and GC-09 and GC-10 are the Na-HCO\({}_{3}\)-Cl type; the water quality type in the disturbance stage after the workover of 15 days: GC-06 is Na-Cl, and GC-09 and GC-10 are Na-Cl-HCO\({}_{3}\). Stable Drainage Period before Well Workover (prior to 15 days): During this period, the CBM-produced water showed the highest content of inorganic minerals within the precipitation minerals, reaching 40.9%. This was followed by vitrinite and inertinite, with the plastid group content at 36.5% and the inert group content at 22.6%. Among the inorganic minerals, clay minerals constituted the largest proportion. Specifically, clay minerals accounted for 93% of the inorganic component in well GC-06, and 100% in well GC-09. Kaolinite and illite were the predominant clay minerals in both wells, making up 16.74% and 10.65% of the microscopic composition, respectively. Disturbed Drainage Period after Workover (within 15 days): During this time, the composition of precipitation minerals in the CBM-produced water changed significantly, with a notable decrease in the inorganic mineral content of the microscopic components. In well GC-06, the proportion of inorganic minerals dropped to 21%, and in well GC-09, it decreased to 24.3%. The microscopic composition also showed changes after the workover: vitrinite content increased while inertinite content decreased. For instance, in well GC-06, the vitrinite proportion increased by 23.7%, whereas the inertinite proportion decreased by 3.8% within 15 days post-workover compared to the initial 45 days. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Well ID** & **Time (Day)** & **Kaolinite** & **Illite** & **Chlorite** & **Illite/Smectite** &
\begin{tabular}{c} **Non-Clay** \\ **Minerals** \\ \end{tabular} & **Vitrinite** & **Inertinite** \\ \hline \multirow{3}{*}{GC-06} & \(-\)45 days & 16.74 & 10.65 & 3.80 & 6.85 & 2.86 & 36.50 & 22.60 \\  & +15 days & 8.59 & 5.47 & 1.95 & 3.52 & 1.47 & 60.20 & 18.80 \\  & +45 days & 17.28 & 11.00 & 3.93 & 7.07 & 2.96 & 42.53 & 15.23 \\ \hline \multirow{3}{*}{GC-09} & \(-\)45 days & 13.79 & 11.49 & 4.21 & 8.81 & 0.00 & 40.10 & 21.60 \\  & +15 days & 8.75 & 7.29 & 2.67 & 5.59 & 0.00 & 59.20 & 16.50 \\  & +45 days & 15.27 & 12.73 & 4.67 & 9.76 & 0.00 & 42.24 & 15.34 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: The percentage of microscopic composition of precipitated minerals (in %). Figure 8: Compositional changes of precipitation minerals in Well GC-09 before and after workover. Figure 7: Compositional changes of precipitation minerals in Well GC-06 before and after workover. During the stable drainage stage following the workover (after 45 days), the proportion of precipitated minerals essentially returned to pre-workover levels. Using GC-06 as an example, specific changes over the 45-day period before and after the workover were observed as follows: kaolinite increased from 16.7% to 17.28%, illite from 10.65% to 11.0%, chlorite from 3.8% to 3.93%, and vitrinite from 36.5% to 42.53%, and interintite decreased from 22.6% to 15.23%. Detailed data can be found in Table 2.