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2024 Swanson Tyonek
Hilcorp Alaska, LLC February 10, 2025 Mr. Brett Huber, Commissioner Alaska Oil and Gas Conservation Commission 333 W. 7th Avenue, Suite 100 Anchorage, AK 99501 Re: 2024 Annual Material Balance Calculations of Production and Injection Volumes – Swanson River Gas Storage Facility #3 (Tyonek 77-3 sand) Swanson River Field Dear Commissioner Huber: Attached for your review is the annual material balance calculation of production and injection volumes for the Swanson River Gas Storage Facility #3 (SRGSF #3), as required per AOGCC Storage Injection Order #6 (SIO #6). This material balance report covers the primary production period (Jul. 2004 – Nov. 2005), as well as the gas storage operations that have taken place since Dec. 2005. The 77-3 reservoir in the Swanson River field was in active use for all of 2024 and was an important component of total gas deliverability for the Cook Inlet. Three active wells were used for injection and production in 2024: SCU 42-05X, SCU 42-05Y, and SCU 42-05Z. Hilcorp has performed material balance calculations on the 77-3 reservoir to provide assurance of continued reservoir confinement of the gas storage volumes. Supporting data is attached in numerical and graphical form (P/Z plot) for the convenience of the reader. BHP calculations were made for the 2024 storage cycle between January and December. These data points are plotted with the historical data and they conform to the overall curve, indicating continued confinement of the storage gas. Sincerely, Daniel Taylor Reservoir Engineer, P.E. 143467 Attachments: 1) Tyonek 77-3 P/Z Data 2) Tyonek 77-3 P/Z vs Cumulative Production Plot Post Office Box 244027 Anchorage, AK 99524-4027 3800 Centerpoint Drive Suite 1400 Anchorage, AK 99503 Digitally signed by Daniel Taylor (1691) DN: cn=Daniel Taylor (1691) Date: 2025.02.10 12:09:25 - 09'00' Daniel Taylor (1691) Year Month WELL_RES WELL_NAME DATE_TIME TbgPress GIP Gp Pz 2012 2 Tyonek 77-3 SCU 42-05Y 2/28/2012 2709 2032.469 0.745 4061.979 2012 3 Tyonek 77-3 SCU 42-05Y 3/31/2012 2166 1333.735 1.444 3387.87 2012 4 Tyonek 77-3 SCU 42-05Y 4/30/2012 2170 1207.374 1.57 3393.297 2012 5 Tyonek 77-3 SCU 42-05Y 5/31/2012 2009 1052.641 1.725 3169.455 2012 6 Tyonek 77-3 SCU 42-05X 6/30/2012 2043 1003.031 1.774 2794.265 2012 7 Tyonek 77-3 SCU 42-05X 7/31/2012 2200 976.2 1.801 2995.482 2012 8 Tyonek 77-3 SCU 42-05Y 8/31/2012 2430 1083.337 1.694 3731.369 2012 9 Tyonek 77-3 SCU 42-05X 9/30/2012 2539 1233.972 1.543 3406.668 2012 10 Tyonek 77-3 SCU 42-05Y 10/31/2012 2991 1394.588 1.383 4362.304 2012 11 Tyonek 77-3 SCU 42-05X 11/30/2012 2185 1258.096 1.519 2976.553 2012 12 Tyonek 77-3 SCU 42-05X 12/31/2012 2210 1221.048 1.556 3008.067 2013 1 Tyonek 77-3 SCU 42-05X 1/31/2013 2525 1303.08 1.474 3390.317 2013 2 Tyonek 77-3 SCU 42-05Y 2/28/2013 2146 1213.159 1.564 3360.633 2013 3 Tyonek 77-3 SCU 42-05X 3/31/2013 2701 1389.98 1.387 3591.924 2013 4 Tyonek 77-3 SCU 42-05X 4/30/2013 3076 1678.867 1.099 3992.865 2013 8 Tyonek 77-3 SCU 42-05X 8/31/2013 3904 2203.768 0.574 4740.185 2014 2 Tyonek 77-3 SCU 42-05Y 2/28/2014 3056 2033.504 0.744 4426.704 2014 5 Tyonek 77-3 SCU 42-05X 5/31/2014 3410 2225.177 0.552 4317.172 2014 6 Tyonek 77-3 SCU 42-05X 6/30/2014 3465 2365.814 0.412 4367.613 2014 7 Tyonek 77-3 SCU 42-05X 7/31/2014 3463 2327.605 0.45 4365.793 2014 8 Tyonek 77-3 SCU 42-05X 8/31/2014 3068 2251.204 0.526 3984.718 2015 1 Tyonek 77-3 SCU 42-05X 1/31/2015 2605 2047.205 0.73 3483.02 2015 5 Tyonek 77-3 SCU 42-05X 5/31/2015 2507.635 1917.103 0.86 3369.961 2015 6 Tyonek 77-3 SCU 42-05Y 6/30/2015 2599.957 1908.055 0.869 3936.729 2015 7 Tyonek 77-3 SCU 42-05Y 7/31/2015 2427.466 1845.519 0.932 3728.213 2015 8 Tyonek 77-3 SCU 42-05Y 8/31/2015 2385 1821.329 0.956 3674.926 2015 9 Tyonek 77-3 SCU 42-05X 9/30/2015 2358.962 1795.074 0.982 3192.257 2015 10 Tyonek 77-3 SCU 42-05Y 10/31/2015 2043.187 1596.434 1.181 3217.913 2015 11 Tyonek 77-3 SCU 42-05X 11/30/2015 1963.812 1670.02 1.107 2690.185 2015 12 Tyonek 77-3 SCU 42-05X 12/31/2015 2237.223 1779.374 0.998 3042.187 2016 2 Tyonek 77-3 SCU 42-05X 2/28/2016 2364.056 1740.189 1.037 3198.447 2016 3 Tyonek 77-3 SCU 42-05Y 3/31/2016 2194 1675.918 1.101 3425.715 2016 4 Tyonek 77-3 SCU 42-05Y 4/30/2016 2136 1628.983 1.148 3346.95 2016 5 Tyonek 77-3 SCU 42-05X 5/31/2016 2830 1818.002 0.959 3734.242 2016 6 Tyonek 77-3 SCU 42-05X 6/30/2016 2953 2079.567 0.698 3865.649 2016 7 Tyonek 77-3 SCU 42-05X 7/31/2016 3610 2479.49 0.298 4496.576 2016 8 Tyonek 77-3 SCU 42-05X 8/31/2016 4241 2694.231 0.083 4989.972 2016 9 Tyonek 77-3 SCU 42-05X 9/30/2016 4218 2788.957 -0.012 4973.924 2016 10 Tyonek 77-3 SCU 42-05X 10/31/2016 3575 2688.298 0.089 4465.98 2016 11 Tyonek 77-3 SCU 42-05X 11/30/2016 3500 2618.994 0.158 4399.275 2017 1 Tyonek 77-3 SCU 42-05Y 1/31/2017 3114 2472.973 0.304 4482.642 2017 2 Tyonek 77-3 SCU 42-05Y 2/28/2017 3178 2467.97 0.309 4542.697 2017 3 Tyonek 77-3 SCU 42-05Y 3/31/2017 2525 2157.355 0.62 3847.681 2017 4 Tyonek 77-3 SCU 42-05Y 4/30/2017 2800 2230.167 0.547 4162.61 2017 5 Tyonek 77-3 SCU 42-05X 5/31/2017 2255.326 1944.104 0.833 3064.763 2017 6 Tyonek 77-3 SCU 42-05X 6/30/2017 2400 1930.979 0.846 3241.92 2017 7 Tyonek 77-3 SCU 42-05Y 7/31/2017 2430 1925.569 0.852 3731.369 2017 8 Tyonek 77-3 SCU 42-05Y 8/31/2017 2635 2014.879 0.763 3977.535 2017 9 Tyonek 77-3 SCU 42-05Y 9/30/2017 2711 2033.786 0.744 4064.229 2017 10 Tyonek 77-3 SCU 42-05Y 10/31/2017 2795 2063.809 0.714 4157.173 2017 11 Tyonek 77-3 SCU 42-05X 11/30/2017 2684 2035.373 0.742 3572.825 Year Month WELL_RES WELL_NAME DATE_TIME TbgPress GIP Gp Pz 2018 2 Tyonek 77-3 SCU 42-05Y 2/28/2018 2215 1693.513 1.084 3453.879 2018 3 Tyonek 77-3 SCU 42-05Y 3/31/2018 1915 1639.824 1.138 3033.637 2018 4 Tyonek 77-3 SCU 42-05Y 4/30/2018 2123 1650.763 1.127 3329.098 2018 5 Tyonek 77-3 SCU 42-05Y 5/31/2018 2333 1744.875 1.033 3608.624 2018 6 Tyonek 77-3 SCU 42-05Y 6/30/2018 2545 1834.046 0.943 3871.676 2018 7 Tyonek 77-3 SCU 42-05Y 7/31/2018 2818 2010.499 0.767 4182.096 2018 8 Tyonek 77-3 SCU 42-05Y 8/31/2018 3118 2142.365 0.635 4486.447 2018 9 Tyonek 77-3 SCU 42-05Y 9/30/2018 3240 2213.112 0.564 4599.204 2018 10 Tyonek 77-3 SCU 42-05Y 10/31/2018 3264 2250.732 0.527 4620.636 2018 11 Tyonek 77-3 SCU 42-05Y 11/30/2018 2968 2157.038 0.62 4339.084 2018 12 Tyonek 77-3 SCU 42-05X 12/31/2018 2870 2141.178 0.636 3777.436 2019 1 Tyonek 77-3 SCU 42-05X 1/31/2019 2841 2107.268 0.67 3746.165 2019 2 Tyonek 77-3 SCU 42-05X 2/28/2019 2850 2097.313 0.68 3755.895 2019 3 Tyonek 77-3 SCU 42-05X 3/31/2019 2850 2001.33 0.776 3755.895 2019 4 Tyonek 77-3 SCU 42-05Y 4/30/2019 2575 1968.303 0.809 3907.347 2019 5 Tyonek 77-3 SCU 42-05Y 5/31/2019 2457 1886.343 0.891 3764.819 2019 6 Tyonek 77-3 SCU 42-05Y 6/30/2019 2334 1813.724 0.964 3609.91 2019 7 Tyonek 77-3 SCU 42-05X 7/31/2019 2300 1760.793 1.017 3120.086 2019 8 Tyonek 77-3 SCU 42-05X 8/31/2019 2341 1752.685 1.025 3170.373 2019 9 Tyonek 77-3 SCU 42-05X 9/30/2019 2368 1754.07 1.023 3203.235 2019 10 Tyonek 77-3 SCU 42-05X 10/31/2019 2596 1934.629 0.843 3472.68 2019 12 Tyonek 77-3 SCU 42-05X 12/31/2019 3211 1735.158 1.042 4127.668 2020 1 Tyonek 77-3 SCU 42-05Y 1/31/2020 1796 1407.167 1.37 2856.275 2020 2 Tyonek 77-3 SCU 42-05Y 2/28/2020 1621 1281.624 1.496 2584.445 2020 3 Tyonek 77-3 SCU 42-05Y 3/31/2020 1575 1208.355 1.569 2510.817 2020 4 Tyonek 77-3 SCU 42-05Y 4/30/2020 1833 1278.631 1.499 2912.07 2020 5 Tyonek 77-3 SCU 42-05X 5/31/2020 2006 1577.23 1.2 2745.851 2020 8 Tyonek 77-3 SCU 42-05X 8/31/2020 3646 2250.591 0.527 4527.692 2020 9 Tyonek 77-3 SCU 42-05X 9/30/2020 3738 2501.222 0.276 4605.58 2020 10 Tyonek 77-3 SCU 42-05X 10/31/2020 3890 2648.351 0.129 4729.127 2020 11 Tyonek 77-3 SCU 42-05Y 11/30/2020 3530 2646.721 0.131 4841.676 2020 12 Tyonek 77-3 SCU 42-05Y 12/31/2020 2885 2372.892 0.405 4253.407 2021 1 Tyonek 77-3 SCU 42-05Y 1/31/2021 2476 2170.717 0.607 3788.17 2021 2 Tyonek 77-3 SCU 42-05Y 2/28/2021 2338 1906.373 0.871 3615.049 2021 3 Tyonek 77-3 SCU 42-05X 3/31/2021 2079 1839.701 0.938 2841.008 2021 4 Tyonek 77-3 SCU 42-05X 4/30/2021 2451 1944.206 0.833 3302.989 2021 5 Tyonek 77-3 SCU 42-05X 5/31/2021 2676 2000 0.777 3563.809 2021 6 Tyonek 77-3 SCU 42-05X 6/30/2021 3047.473 2156.732 0.621 3963.733 2021 7 Tyonek 77-3 SCU 42-05X 7/31/2021 3139 2239.679 0.538 4056.401 2021 8 Tyonek 77-3 SCU 42-05X 8/31/2021 3194 2308.233 0.469 4110.97 2021 9 Tyonek 77-3 SCU 42-05Y 9/30/2021 3046 2286.587 0.491 4416.914 2021 10 Tyonek 77-3 SCU 42-05Y 10/31/2021 3070 2292.984 0.484 4440.338 2021 11 Tyonek 77-3 SCU 42-05X 11/30/2021 2718 2148.819 0.629 3610.943 2021 12 Tyonek 77-3 SCU 42-05X 12/31/2021 2730 2005.009 0.772 3624.319 2022 1 Tyonek 77-3 SCU 42-05X 1/31/2022 2245 1859.719 0.918 3051.897 2022 2 Tyonek 77-3 SCU 42-05Y 2/28/2022 2139 1673.494 1.104 3351.059 2022 3 Tyonek 77-3 SCU 42-05X 3/31/2022 1780.449 1587.861 1.19 2442.514 2022 4 Tyonek 77-3 SCU 42-05X 4/30/2022 1808 1585.218 1.192 2480.322 2022 5 Tyonek 77-3 SCU 42-05X 5/31/2022 1808.66 2018.643 0.759 2481.226 2022 6 Tyonek 77-3 SCU 42-05X 6/30/2022 3233 2246.089 0.531 4149.157 2022 7 Tyonek 77-3 SCU 42-05X 7/31/2022 3119.986 2246.089 0.531 4037.341 Year Month WELL_RES WELL_NAME DATE_TIME TbgPress GIP Gp Pz 2022 8 Tyonek 77-3 SCU 42-05X 8/31/2022 3161 2287.972 0.489 4078.329 2022 9 Tyonek 77-3 SCU 42-05X 9/30/2022 3361 2379.277 0.398 4271.528 2022 10 Tyonek 77-3 SCU 42-05Y 10/31/2022 3472 2472.613 0.305 4796.06 2022 11 Tyonek 77-3 SCU 42-05X 11/30/2022 3350 2442.045 0.335 4261.19 2022 12 Tyonek 77-3 SCU 42-05Y 12/31/2022 3134 2272.934 0.504 4501.597 2023 1 Tyonek 77-3 SCU 42-05Y 1/31/2023 2728 2162.942 0.614 4083.282 2023 2 Tyonek 77-3 SCU 42-05Y 2/28/2023 2700 2133.748 0.644 4051.834 2023 3 Tyonek 77-3 SCU 42-05X 3/31/2023 2540 2008.493 0.769 3407.834 2023 4 Tyonek 77-3 SCU 42-05Y 4/30/2023 2853 2014.709 0.763 4219.587 2023 5 Tyonek 77-3 SCU 42-05X 5/31/2023 2876 2019.699 0.758 3783.877 2023 6 Tyonek 77-3 SCU 42-05X 6/30/2023 2945 2026.764 0.751 3857.23 2023 7 Tyonek 77-3 SCU 42-05X 7/31/2023 3400 2217.871 0.56 4307.911 2023 8 Tyonek 77-3 SCU 42-05Y 8/31/2023 3415 2296.461 0.481 4749.828 2023 9 Tyonek 77-3 SCU 42-05X 9/30/2023 3538 2367.703 0.41 4433.267 2023 10 Tyonek 77-3 SCU 42-05X 10/31/2023 3421 2366.579 0.411 4327.327 2023 11 Tyonek 77-3 SCU 42-05X 11/30/2023 3184 2282.555 0.495 4101.111 2023 12 Tyonek 77-3 SCU 42-05Y 12/31/2023 3116 2253.288 0.524 4484.545 2024 1 Tyonek 77-3 SCU 42-05Y 1/31/2024 2923 2121.87 0.656 4292.998 2024 2 Tyonek 77-3 SCU 42-05Y 2/28/2024 2665 2017.31 0.76 4012.051 2024 3 Tyonek 77-3 SCU 42-05X 3/31/2024 2643 1963.895 0.814 3526.433 2024 4 Tyonek 77-3 SCU 42-05X 4/30/2024 2675 1945.052 0.832 3562.681 2024 5 Tyonek 77-3 SCU 42-05Y 5/31/2024 2736 2147.689 0.63 4092.206 2024 6 Tyonek 77-3 SCU 42-05X 6/30/2024 2970 2113.734 0.664 3883.481 2024 7 Tyonek 77-3 SCU 42-05Y 7/31/2024 2998 2134.614 0.643 4369.327 2024 8 Tyonek 77-3 SCU 42-05Y 8/31/2024 3452.944 2275.556 0.502 4780.759 2024 9 Tyonek 77-3 SCU 42-05Y 9/30/2024 3774 2453.422 0.324 5017.817 2024 10 Tyonek 77-3 SCU 42-05X 10/31/2024 3851 2540.017 0.237 4698.038 2024 11 Tyonek 77-3 SCU 42-05X 11/30/2024 3668 2514.65 0.263 4546.531 2024 12 Tyonek 77-3 SCU 42-05Y 12/31/2024 3540 2512.838 0.265 4849.396 2025 1 Tyonek 77-3 SCU 42-05X 1/31/2025 3318 2437.736 0.34 4230.925 2025 2 Tyonek 77-3 SCU 42-05Y 2/28/2025 3244 2410.534 0.367 4602.793 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 -0.5 0.5 1.5 2.5 3.5 4.5 P/ z Gp (bcf) SRF: TY_77-3 Storage Model Actuals Oct 31, 2024 Mean 95% Prediction Interval
