# The Influencing Factors of CO2 Utilization and Storage Efficiency in Gas Reservoir
## 2 Experiments
### Experimental Set-Up  
The effects of displacement velocity, dip angle, permeability and irreducible water on displacement and storage efficiency were tested by carrying out long core experiments. The CH\({}_{4}\) was displaced by CO\({}_{2}\) with various parameters during the experimental process; the experimental design is shown in Table 5.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Core**} & **Core** & **Core** & **Core** & & \\
**Number** & **Length** & **Diameter** & **Volume** & **(\%)** & **Permeability** \\  & **(cm)** & **(cm)** & **(cm\({}^{3}\))** & **(\%)** & **(\(10^{-3}\)\(\mu\)m\({}^{2}\))** \\ \hline
20 & 4.279 & 2.502 & 2.248 & 10.71 & 1.80 \\
14 & 4.995 & 2.502 & 2.745 & 11.20 & 1.80 \\
5 & 5.128 & 2.498 & 2.929 & 11.64 & 2.27 \\
27 & 5.500 & 2.498 & 3.138 & 11.63 & 2.42 \\
31 & 5.934 & 2.512 & 3.668 & 12.60 & 2.49 \\
15 & 4.400 & 2.498 & 2.461 & 11.40 & 2.50 \\
78 & 5.400 & 2.502 & 2.567 & 9.69 & 1.17 \\
25 & 5.750 & 2.502 & 3.320 & 11.77 & 2.53 \\
18 & 5.051 & 2.504 & 3.214 & 12.97 & 2.58 \\
77 & 4.534 & 2.511 & 2.209 & 9.93 & 0.99 \\
9 & 5.257 & 2.502 & 3.149 & 12.21 & 2.60 \\
17 & 4.971 & 2.500 & 3.012 & 12.35 & 2.67 \\
22 & 4.763 & 2.498 & 2.979 & 12.75 & 2.68 \\
16 & 5.675 & 2.512 & 2.940 & 10.56 & 0.93 \\
10 & 4.846 & 2.500 & 2.943 & 12.38 & 2.70 \\
8 & 5.095 & 2.498 & 2.910 & 11.64 & 2.74 \\ \hline \(\Sigma\) & 81.875 & 2.502 & 46.432 & 11.58 & 2.18 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Sequence of low permeability long core.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Core**} & **Core** & **Core** & **Core** & **Porosity** & **Permeability** \\
**Number** & **Length** & **Diameter** & **Volume** & **(\%)** & **(\(10^{-3}\)\(\mu\)m\({}^{2}\))** \\  & **(cm)** & **(cm)** & **(cm\({}^{3}\))** & **(\%)** & **(\(10^{-3}\)\(\mu\)m\({}^{2}\))** \\ \hline
2–12 & 6.903 & 2  
The long core displacement system (Figure 2) was used for displacement. The whole process of the device is shown in Figure 3, which mainly includes three parts: injection system, hold system and production system. Auxiliary equipment includes constant pressure and velocity displacement pump, gas flowmeter, gas chromatograph, etc. Based on the above equipment, the experimental conditions of a temperature range between 0 and 150 \({}^{\circ}\)C and a pressure range between 0 and 70 MPa could be achieved.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Core** & **Core** & **Core** & **Pore** & **Porosity** & **Permeability** \\
**Number** & **Length** & **Diameter** & **Volume** & **(\%)** & **(\(10^{-3}\)\(\mu\)m\({}^{2}\))** \\ \hline
20 & 6.400 & 2.5 & 4.245 & 13.52 & 99.32 \\
14 & 6.647 & 2.5 & 4.471 & 13.71 & 96.55 \\
5 & 6.287 & 2.5 & 4.075 & 13.21 & 96.49 \\
27 & 5.739 & 2.5 & 3.810 & 13.53 & 95.19 \\
31 & 6.513 & 2.5 & 4.461 & 13.96 & 103.26 \\
15 & 4.461 & 2.5 & 4.629 & 21.15 & 93.14 \\
78 & 5.845 & 2.5 & 4.124 & 14.38 & 106.23 \\
25 & 6.198 & 2.5 & 4.437 & 14.59 & 110.44 \\
18 & 6.475 & 2.5 & 4.238 & 12.35 & 118.75 \\
77 & 6.854 & 2.5 & 4.153 & 13.54 & 72.49 \\
9 & 6.567 & 2.5 & 4.362 & 23.11 & 129.57 \\
17 & 4.700 & 2.5 & 5.329 & 12.76 & 68.44 \\
22 & 5.981 & 2.5 & 3.744 & 24.99 & 176.67 \\ \hline \(\Sigma\) & 83.442 & 2.5 & 61.932 & 15.581 & 103.63 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Sequence of high permeability long core.  
Figure 2: Core displacement system.