## 3 Results and Discussion
### Gas Recovery Efficiency and Interlayer Compatibility
#### 3.3.2 Interference Index and Commingled Production Loss Ratio  
The interference index and gas production loss ratio for each layer during commingled multilayer production are tabulated in Table 4. The gas production loss ratio during commingled production refers to the ratio of the total gas production to the cumulative  
Figure 8: Gas production coefficients of (**a**) layer Q5 and (**b**) layer H8 in commingled two-layer (Q5 + H8 layer) production experiments, together with their corresponding single-layer depletion experiments. production from the single-layer depletion experiments of the corresponding layers. In the case of commingled two-layer production of the Q5 + H8 layer, its interference indices for the layers Q5 and H8 are, respectively, calculated to be 28.28 and 6.57, resulting in an overall gas production loss ratio of 10.95%. During the commingled H8 + BX layer production, the interference index is relatively lower, resulting in a 6.67% reduction in gas output compared to that of single-layer production. Compared to single-layer production, the commingled production of the BX + TY layers exhibits a comparatively smaller variation in gas output with an insignificantly low rate of gas production loss. In the case of commingled three-layer production for the Q5 + H8 + S2 and Q5 + S2 + TY layers, the interference index is relatively high, with the layer Q5 being the most \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multicolumn{2}{c}{**Number of**} & & & & & \\ \multicolumn{2}{c}{**Commingled Layers**} & & & & & \\ \multicolumn{2}{c}{**Conditioned Layers**} & & & & & \\ \hline \multirow{6}{*}{2} & Q5 & & & 28.28 & \multirow{6}{*}{10.95} \\ \cline{2-5}  & H8 & & & 6.57 & \\ \cline{2-5}  & H8 & & & 9.07 & \multirow{6}{*}{6.67} \\ \cline{2-5}  & BX & & & 2.06 & \\ \cline{2-5}  & S1 & & & \(-\)0.6 & \\ \cline{2-5}  & TY & & & 1.10 & \multirow{6}{*}{0.08} \\ \cline{2-5}  & Q5 & & & 36.54 & \\ \cline{2-5}  & H8 & & & 8.53 & \multirow{6}{*}{12.27} \\ \cline{2-5}  & S2 & & & 8.93 & \\ \cline{2-5}  & Q5 & & & 38.24 & \\ \cline{2-5}  & S2 & & & 8.98 & \multirow{6}{*}{13.1} \\ \cline{2-5}  & TY & & & 9.24 & \\ \cline{2-5}  & H8 & & & 0.06 & \\ \cline{2-5}  & S2 & & & 0.03 & \\ \cline{2-5}  & TY & & & 0.87 & \\ \cline{2-5}  & S2 & & & 12.51 & \multirow{6}{*}{8.16} \\ \cline{2-5}  & TY & & & 4.88 & \\ \cline{2-5}  & BX & & & 2.80 & \\ \cline{2-5}  & QS5 & & & 44.33 & \\ \cline{2-5}  & H8 & & & 9.10 & \multirow{6}{*}{13.36} \\ \cline{2-5}  & S1 & & & 10.09 & \\ \cline{2-5}  & TY & & & 10.61 & \\ \cline{2-5}  & H8 & & & 0.53 & \\ \cline{2-5}  & S1 & & & 0.36 & \\ \cline{2-5}  & S2 & & & 0.08 & \\ \cline{2-5}  & TY & & & 0.95 & \\ \cline{2-5}  & H8 & & & 15.58 & \\ \cline{2-5}  & S2 & & & 9.78 & \\ \cline{2-5}  & TY & & & 1.96 & \\ \cline{2-5}  & BX & & & 5.11 & \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Summary of interference index and gas production loss ratio. significantly affected one. The respective gas production loss ratios are calculated to be 12.27% and 13.10%. For the commingled production for the S2 + TY + BX layers, the interference index in the affected S2 layer reaches 12.51%, resulting in a gas production loss ratio of 8.16%. The interference index is relatively low for the commingled production from the H8 + S2 + TY layers. For the case of commingled four-layer production for the Q5 + H8 + S1 + TY layers, the gas recovery of layer Q5 is decreased from 81.80% in single-layer depletion production to 45.54%, with the interference index up to 44.33%, indicating a high level of interference, and its overall gas production loss ratio is 13.36%. In contrast, the commingled production from the H8 + S2 + TY + BX layers exhibits two interfered layers, with the primary affected layer H8 having an interference index of 15.58% and the secondary affected layer S2 having an interference index of 9.78%, with an overall gas production loss ratio of 8.98%. The interference level in commingled production for the H8 + S1 + S2 + TY layers is relatively low, resulting in minimal loss of gas production.