## 3 Production Data Analysis  
Data collected from the 1216 wells show how variable each formation was in terms of the expected production parameters and also the common completion procedures performed in each formation. Table 2 shows the major key production performance indicators for each formation, such as cumulative oil and gas productions, water cut, maximum flow rate, and average well life using the data from all the wells used in this study. The range of productivity varied greatly between formations and even varied within wells from the same formation. Different completion designs produced different productivities between wells from the same formation.  
Several key performance indicators (KPIs) were developed for each formation by measuring the average of all the wells collected per each formation. The first production data KPIs measured was the average well life. Average well life was measured as the number of months of reported production for each well from its first day of production until it was shut-in for reaching the economic limit or not being profitable anymore. Figure 1 shows the average well life for each formation. Another production data KPI was the cumulative production. It was measured as the total produced volume for each well in barrel of oil equivalent (BOE). Figure 2 shows the results broken down into cumulative production, cumulative production after three months of production, cumulative production after six months of production, cumulative production after one year of production, and cumulative production after two years of production. Additionally, the percentage drop in production rate was measured in all the wells to indicate the typical rapid productivity drop in wells in shale formations. Percentage drop in production rate is usually very high in unconventional wells within the first year of production. In Figure 3, a comparison of the average drops in production rates for each formation within one year is provided.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Formation** & **Well Type** & **Number of Wells** \\ \hline Niobrara & Liquid-rich gas & 161 \\ Barnett & Gas & 505 \\ Haynesville & Gas & 101 \\ Eagle Ford & Oil & 334 \\ Bakken & Oil & 115 \\ Total & & 1216 \\ \hline \hline \end{tabular}
\end{table}
Table 1: Number of wells collected and used from each formation.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{3}{*}{**Formation**} & \multirow{3}{*}{\begin{tabular}{c} **Average** \\ **Average Well** \\ **Life (Months)** \\ \end{tabular} } & \begin{tabular}{c} **Average** \\ **Conulative Group** \\ **(Barrel of Oil** \\ **Equivalent** \\ **(BOE/Well)** \\ \end{tabular} & \begin{tabular}{c} **Average** \\ **Conulative Group** \\ **(Mcf/Well)** \\ \end{tabular} & \begin{tabular}{c} **Average** \\ **Conulative Group** \\ **(bbl/Well)** \\ \end{tabular} & \
\begin{tabular}{c} **Average** \\ **Maximum Flow** \\ **Rate** \\ **(BOE/Month)** \\ \end{tabular} &
\begin{tabular}{c} **Average** \\ **Cut (\%)** \\ \end{tabular} \\ \hline Niobrara & 49 & 140,848 & 394,446 & 74,976 & 12,341 & 16.4 \\ Barnett & 62 & 124,498 & 661,102 & - & 8192 & 56.13 \\ Haynesville & 69 & 547,384 & 3,277,748 & - & 43,858 & 13.47 \\ Eagle Ford & 70 & 245,791 & 813,021 & 110,016 & 20,754 & 22.48 \\ \hline Bakken & 71 & 182,105 & 186,321 & 150,989 & 14,419 & 44.53 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Average major key production performance indicators for each formation.  
Figure 1: Average well life for each formation.  
Figure 2: Average cumulative production volumes after entire well’s life, two years, one year, six months, and three months for all wells from each formation. BOE: barrel of oil equivalent.