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2023 Pretty Creek
Hilcorp Alaska, LLC February 22, 2024 Mr. Brett Huber, Commissioner Alaska Oil and Gas Conservation Commission 333 W. 7th Avenue, Suite 100 Anchorage, AK 99501 Re: 2023 Annual Material Balance Calculations Pretty Creek Gas Storage Facility, Pretty Creek Unit #4 Dear Commissioner Huber: Attached for your review is the 2023 “Annual Performance Report” for the Pretty Creek Gas Storage Facility (PCU #4), as required per AOGCC Storage Injection Order #4 (SIO #4). This material balance report covers the primary production period through the 2023 gas storage operations. The 51-5 gas storage reservoir was in active use for all of 2023 and was an important component of total gas deliverability for the Cook Inlet. There is one active well that is used for injection and production – Pretty Creek Unit #4 (aka PCU #4). Attached find injection and production data for 2023. Hilcorp has performed material balance calculations on the 51-5 reservoir to provide assurance of continued reservoir confinement of the gas storage volumes. Supporting data is attached in numerical and graphical form for the convenience of the reader. All production and injection cycles performed in 2023 consistently match the historical P/Z trend established by past performance of this reservoir. Sincerely, Daniel Taylor Reservoir Engineer, P.E. 143467 Attachments: 1) 51-5 P/Z Data 2) 51-5 P/Z vs Cumulative Production Plot Post Office Box 244027 Anchorage, AK 99524-4027 3800 Centerpoint Drive Suite 100 Anchorage, AK 99503 Year Month Reservoir Gas InjGas InjLessGas GasQ1 GasQ2 GasQ3 GasQ4 GasQ5 WELL_NAME DATE_TIME TbgPress TP_Date Date GIP (MMCF) Pz Gp (BCF) 2016 8 BG.51-5_ST.45-0 8.51148 66.49217 57.98069 0 0 0 0 5 PC 4 8/31/2016 1465 8/31/2016 12/31/2012 2245.73155 2209.327938 -0.190660458 2016 9 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 9/30/2016 1450 9/30/2016 12/31/2012 2245.73155 2184.306293 -0.190660458 2016 10 BG.51-5_ST.45-0 35.71879 0 -35.71879 0 0 0 2 5 PC 4 10/31/2016 1411 10/31/2016 12/31/2012 2210.01276 2119.136922 -0.154941668 2016 11 BG.51-5_ST.45-0 20.96905 0 -20.96905 0 0 0 0 5 PC 4 11/30/2016 1416 11/25/2016 12/31/2012 2189.04371 2127.501099 -0.133972618 2016 12 BG.51-5_ST.45-0 156.56442 0 -156.56442 0 2 6 8 9 PC 4 12/31/2016 1302 12/31/2016 12/31/2012 2032.47929 1936.130599 0.022591802 2017 1 BG.51-5_ST.45-0 19.813 0 -19.813 0 0 0 0 9 NA 1/31/2017 NA NA 12/31/2012 2012.66629 NA 0.042404802 2017 2 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 2/28/2017 1310 2/28/2017 12/31/2012 2012.66629 1949.605646 0.042404802 2017 3 BG.51-5_ST.45-0 0 138.66943 138.66943 0 0 0 0 0 PC 4 3/31/2017 1308 3/3/2017 12/31/2012 2151.33572 1946.237528 -0.096264628 2017 4 BG.51-5_ST.45-0 0 31.27949 31.27949 0 0 0 0 0 PC 4 4/30/2017 1420 4/30/2017 12/31/2012 2182.61521 2134.190507 -0.127544118 2017 5 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 5/31/2017 1414 5/31/2017 12/31/2012 2182.61521 2124.155751 -0.127544118 2017 6 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 6/30/2017 1410 6/30/2017 12/31/2012 2182.61521 2117.463765 -0.127544118 2017 7 BG.51-5_ST.45-0 0.03114 0 -0.03114 0 0 0 0 0 PC 4 7/31/2017 1406 7/31/2017 12/31/2012 2182.58407 2110.770061 -0.127512978 2017 8 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 8/31/2017 1401 8/31/2017 12/31/2012 2182.58407 2102.400514 -0.127512978 2017 9 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 9/30/2017 1400 9/30/2017 12/31/2012 2182.58407 2100.726283 -0.127512978 2017 10 BG.51-5_ST.45-0 1.2201 0 -1.2201 0 0 0 0 1 PC 4 10/31/2017 1400 10/30/2017 12/31/2012 2181.36397 2100.726283 -0.126292878 2017 11 BG.51-5_ST.45-0 7.97225 0 -7.97225 0 0 0 0 5 PC 4 11/30/2017 1391 11/30/2017 12/31/2012 2173.39172 2085.653367 -0.118320628 2017 12 BG.51-5_ST.45-0 3.59043 0 -3.59043 0 0 0 0 3 PC 4 12/31/2017 1257 12/31/2017 12/31/2012 2169.80129 1860.205389 -0.114730198 2018 1 BG.51-5_ST.45-0 12.09307 0 -12.09307 0 0 0 0 7 PC 4 1/31/2018 1380 1/31/2018 12/31/2012 2157.70822 2067.219099 -0.102637128 2018 2 BG.51-5_ST.45-0 0.00138 0 -0.00138 0 0 0 0 0 PC 4 2/28/2018 1385 2/28/2018 12/31/2012 2157.70684 2075.599923 -0.102635748 2018 3 BG.51-5_ST.45-0 121.39166 0.8911 -120.50056 0 0 6 6 6 PC 4 3/31/2018 1277 3/31/2018 12/31/2012 2037.20628 1893.976777 0.017864812 2018 4 BG.51-5_ST.45-0 0 0.04571 0.04571 0 0 0 0 0 PC 4 4/30/2018 1310 4/30/2018 12/31/2012 2037.25199 1949.605646 0.017819102 2018 5 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 5/31/2018 1320 5/31/2018 12/31/2012 2037.25199 1966.439787 0.017819102 2018 6 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 6/30/2018 1323 6/30/2018 12/31/2012 2037.25199 1971.487936 0.017819102 2018 7 BG.51-5_ST.45-0 0.00057 0 -0.00057 0 0 0 0 0 PC 4 7/31/2018 1324 7/31/2018 12/31/2012 2037.25142 1973.170437 0.017819672 2018 8 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 8/31/2018 1321 8/31/2018 12/31/2012 2037.25142 1968.122611 0.017819672 2018 9 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 9/30/2018 1332 9/30/2018 12/31/2012 2037.25142 1986.626581 0.017819672 2018 10 BG.51-5_ST.45-0 0 9.1099 9.1099 0 0 0 0 0 PC 4 10/31/2018 1338 10/31/2018 12/31/2012 2046.36132 1996.714178 0.008709772 2018 11 BG.51-5_ST.45-0 9.21464 0 -9.21464 0 0 0 0 5 PC 4 11/30/2018 1338 11/29/2018 12/31/2012 2037.14668 1996.714178 0.017924412 2018 12 BG.51-5_ST.45-0 60.52566 0 -60.52566 0 0 0 5 6 PC 4 12/31/2018 1290 12/31/2018 12/31/2012 1976.62102 1915.905142 0.078450072 2019 1 BG.51-5_ST.45-0 53.50176 0 -53.50176 0 0 0 5 6 PC 4 1/31/2019 1115 1/31/2019 12/31/2012 1923.11926 1619.19322 0.131951832 2019 2 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 2/28/2019 1125 2/28/2019 12/31/2012 1923.11926 1636.236792 0.131951832 2019 3 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 3/31/2019 1268 3/31/2019 12/31/2012 1923.11926 1878.784969 0.131951832 2019 4 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 4/30/2019 1266 4/30/2019 12/31/2012 1923.11926 1875.40783 0.131951832 2019 5 BG.51-5_ST.45-0 0 6.80876 6.80876 0 0 0 0 0 PC 4 5/31/2019 1279 5/31/2019 12/31/2012 1929.92802 1897.351553 0.125143072 2019 6 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 6/30/2019 1277 6/30/2019 12/31/2012 1929.92802 1893.976777 0.125143072 2019 7 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 7/31/2019 1277 7/31/2019 12/31/2012 1929.92802 1893.976777 0.125143072 2019 8 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 8/31/2019 1277 8/31/2019 12/31/2012 1929.92802 1893.976777 0.125143072 2019 9 BG.51-5_ST.45-0 33.71913 33.28426 -0.43487 0 0 0 2 5 PC 4 9/30/2019 1254 9/19/2019 12/31/2012 1929.49315 1855.135975 0.125577942 2019 10 BG.51-5_ST.45-0 10.57803 1.61436 -8.96367 0 0 0 0 5 PC 4 10/31/2019 1268 10/31/2019 12/31/2012 1920.52948 1878.784969 0.134541612 2019 11 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 11/30/2019 1281 11/30/2019 12/31/2012 1920.52948 1900.725899 0.134541612 2019 12 BG.51-5_ST.45-0 78.13653 0 -78.13653 0 0 0 6 6 PC 4 12/31/2019 1220 12/31/2019 12/31/2012 1842.39295 1797.615068 0.212678142 2020 1 BG.51-5_ST.45-0 158.01119 0 -158.01119 0 6 6 6 7 PC 4 1/31/2020 1127 1/22/2020 12/31/2012 1684.38176 1639.644218 0.370689332 2020 2 BG.51-5_ST.45-0 133.03217 0 -133.03217 0 4 5 7 7 PC 4 2/28/2020 983 2/28/2020 12/31/2012 1551.34959 1393.211518 0.503721502 2020 3 BG.51-5_ST.45-0 121.13033 0 -121.13033 0 1 5 6 6 PC 4 3/31/2020 984 3/13/2020 12/31/2012 1430.21926 1394.930535 0.624851832 2020 4 BG.51-5_ST.45-0 34.76803 97.69918 62.93115 0 0 0 0 5 PC 4 4/30/2020 845 4/5/2020 12/31/2012 1493.15041 1154.957058 0.561920682 2020 5 BG.51-5_ST.45-0 0 160.49568 160.49568 0 0 0 0 0 NA 5/31/2020 NA NA 12/31/2012 1653.64609 NA 0.401425002 2020 6 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 6/30/2020 1135 6/30/2020 12/31/2012 1653.64609 1653.269624 0.401425002 2020 7 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 7/31/2020 1136 7/31/2020 12/31/2012 1653.64609 1654.972317 0.401425002 2020 8 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 8/31/2020 1143 8/31/2020 12/31/2012 1653.64609 1666.888157 0.401425002 2020 9 BG.51-5_ST.45-0 6.22829 36.84302 30.61473 0 0 0 0 4 PC 4 9/30/2020 1170 9/30/2020 12/31/2012 1684.26082 1712.799958 0.370810272 2020 10 BG.51-5_ST.45-0 0 23.87239 23.87239 0 0 0 0 0 PC 4 10/31/2020 1195 10/31/2020 12/31/2012 1708.13321 1755.241076 0.346937882 2020 11 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 11/30/2020 1194 11/30/2020 12/31/2012 1708.13321 1753.54472 0.346937882 2020 12 BG.51-5_ST.45-0 165.45771 0 -165.45771 2 5 6 6 6 NA 12/31/2020 NA NA 12/31/2012 1542.6755 NA 0.512395592 2021 1 BG.51-5_ST.45-0 154.08077 0 -154.08077 0 5 5 6 6 NA 1/31/2021 NA NA 12/31/2012 1388.59473 NA 0.666476362 2021 2 BG.51-5_ST.45-0 131.85475 0 -131.85475 1 5 5 5 5 NA 2/28/2021 NA NA 12/31/2012 1256.73998 NA 0.798331112 2021 3 BG.51-5_ST.45-0 8.68825 0.05395 -8.6343 0 0 0 0 4 PC 4 3/31/2021 783 3/30/2021 12/31/2012 1248.10568 1047.249319 0.806965412 2021 4 BG.51-5_ST.45-0 0 124.41927 124.41927 0 0 0 0 0 PC 4 4/30/2021 870 4/16/2021 12/31/2012 1372.52495 1198.2708 0.682546142 2021 5 BG.51-5_ST.45-0 0 156.20999 156.20999 0 0 0 0 0 NA 5/31/2021 NA NA 12/31/2012 1528.73494 NA 0.526336152 2021 6 BG.51-5_ST.45-0 0.00815 133.84554 133.83739 0 0 0 0 0 PC 4 6/30/2021 1168 6/16/2021 12/31/2012 1662.57233 1709.401769 0.392498762 2021 7 BG.51-5_ST.45-0 0 30.86335 30.86335 0 0 0 0 0 PC 4 7/31/2021 1228 7/31/2021 12/31/2012 1693.43568 1811.160569 0.361635412 2021 8 BG.51-5_ST.45-0 20.50909 0.02671 -20.48238 0 0 0 0 5 PC 4 8/31/2021 1230 8/30/2021 12/31/2012 1672.9533 1814.54587 0.382117792 2021 9 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 9/30/2021 1199 9/30/2021 12/31/2012 1672.9533 1762.025425 0.382117792 2021 10 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 10/31/2021 1200 10/31/2021 12/31/2012 1672.9533 1763.721244 0.382117792 2021 11 BG.51-5_ST.45-0 87.75411 0 -87.75411 0 0 5 5 5 PC 4 11/30/2021 1200 11/12/2021 12/31/2012 1585.19919 1763.721244 0.469871902 2021 12 BG.51-5_ST.45-0 153.15153 0 -153.15153 4 5 5 5 6 NA 12/31/2021 NA NA 12/31/2012 1432.04766 NA 0.623023432 2022 1 BG.51-5_ST.45-0 149.67298 0 -149.67298 4 5 5 5 5 NA 1/31/2022 NA NA 12/31/2012 1282.37468 NA 0.772696412 2022 2 BG.51-5_ST.45-0 120.78701 0 -120.78701 3 4 4 5 5 NA 2/28/2022 NA NA 12/31/2012 1161.58767 NA 0.893483422 2022 3 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 3/31/2022 739 3/31/2022 12/31/2012 1161.58767 970.5611121 0.893483422 2022 4 BG.51-5_ST.45-0 0 33.67411 33.67411 0 0 0 0 0 PC 4 4/30/2022 1065 4/24/2022 12/31/2012 1195.26178 1533.814261 0.859809312 2022 5 BG.51-5_ST.45-0 0 0 0 0 0 0 0 0 PC 4 5/31/2022 815 5/31/2022 12/31/2012 1195.26178 1102.891962 0.859809312 2022 6 BG.51-5_ST.45-0 0 144.22152 144.22152 0 0 0 0 0 PC 4 6/30/2022 820 6/1/2022 12/31/2012 1339.4833 1111.57619 0.715587792 2022 7 BG.51-5_ST.45-0 0 156.11773 156.11773 0 0 0 0 0 NA 7/31/2022 NA NA 12/31/2012 1495.60103 NA 0.559470062 2022 8 BG.51-5_ST.45-0 0 157.52383 157.52383 0 0 0 0 0 NA 8/31/2022 NA NA 12/31/2012 1653.12486 NA 0.401946232 2022 9 BG.51-5_ST.45-0 0 150.39659 150.39659 0 0 0 0 0 NA 9/30/2022 NA NA 12/31/2012 1803.52145 NA 0.251549642 2022 10 BG.51-5_ST.45-0 0 114.26413 114.26413 0 0 0 0 0 PC 4 10/31/2022 1395 10/31/2022 12/31/2012 1917.78558 2092.353515 0.137285512 2022 11 BG.51-5_ST.45-0 44.81269 0 -44.81269 0 0 0 3 6 PC 4 11/30/2022 1362 11/24/2022 12/31/2012 1872.97289 2037.025903 0.182098202 2022 12 BG.51-5_ST.45-0 178.77842 0 -178.77842 5 6 6 6 6 NA 12/31/2022 NA NA 12/31/2012 1694.19447 NA 0.360876622 2023 1 BG.51-5_ST.45-0 177.19904 0 -177.19904 4 6 6 6 6 NA 1/31/2023 NA NA 12/31/2012 1516.99543 NA 0.538075662 2023 2 BG.51-5_ST.45-0 107.86956 0 -107.86956 0 0 5 5 6 PC 4 2/28/2023 983 2/28/2023 12/31/2012 1409.12587 1393.211518 0.645945222 2023 3 BG.51-5_ST.45-0 0 105.75868 105.75868 0 0 0 0 0 PC 4 3/31/2023 996 3/9/2023 12/31/2012 1514.88455 1415.550365 0.540186542 2023 4 BG.51-5_ST.45-0 0 107.05619 107.05619 0 0 0 0 0 PC 4 4/30/2023 1145 4/17/2023 12/31/2012 1621.94074 1670.291716 0.433130352 2023 5 BG.51-5_ST.45-0 0 160.86111 160.86111 0 0 0 0 0 NA 5/31/2023 NA NA 12/31/2012 1782.80185 NA 0.272269242 2023 6 BG.51-5_ST.45-0 0 148.94412 148.94412 0 0 0 0 0 NA 6/30/2023 NA NA 12/31/2012 1931.74597 NA 0.123325122 2023 7 BG.51-5_ST.45-0 0 158.40275 158.40275 0 0 0 0 0 NA 7/31/2023 NA NA 12/31/2012 2090.14872 NA -0.035077628 2023 8 BG.51-5_ST.45-0 0 115.02185 115.02185 0 0 0 0 0 PC 4 8/31/2023 1469 8/14/2023 12/31/2012 2205.17057 2215.996296 -0.150099478 2023 9 BG.51-5_ST.45-0 0 116.52253 116.52253 0 0 0 0 0 PC 4 9/30/2023 1564 9/30/2023 12/31/2012 2321.6931 2373.86474 -0.266622008 2023 10 BG.51-5_ST.45-0 0.02065 0 -0.02065 0 0 0 0 0 PC 4 10/31/2023 1515 10/31/2023 12/31/2012 2321.67245 2292.558898 -0.266601358 2023 11 BG.51-5_ST.45-0 39.18097 0 -39.18097 0 0 0 0 8 PC 4 11/30/2023 1504 11/23/2023 12/31/2012 2282.49148 2274.271124 -0.227420388 2023 12 BG.51-5_ST.45-0 238.37142 0 -238.37142 5 8 8 8 8 NA 12/31/2023 NA NA 12/31/2012 2044.12006 NA 0.010951032 2024 1 BG.51-5_ST.45-0 241.13816 0 -241.13816 7 8 8 8 8 NA 1/31/2024 NA NA 12/31/2012 1802.9819 NA 0.252089192 2024 2 BG.51-5_ST.45-0 126.20013 0 -126.20013 0 7 7 7 7 NA 2/28/2024 NA NA 12/31/2012 1676.78177 NA 0.378289322 0 500 1,000 1,500 2,000 2,500 3,000 -0.5 0 0.5 1 1.5 2 2.5 3 P/ z Gp (bcf) Current PCU Storage Model Actuals Nov 23, 2023 Tbg Limit 150psig Mean 95% Prediction Interval
