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2021 Pretty Creek
Hilcorp Alaska, LLC February 28, 2022 Mrs. Jessie Chmielowski, Commissioner Alaska Oil and Gas Conservation Commission 333 W. 7 h Avenue, Suite 100 Anchorage, AK 99501 Re: 2021 Annual Material Balance Calculations Pretty Creek Gas Storage Facility, Pretty Creek Unit #4 Dear Commissioner Chmielowski: Post Office Box 244027 Anchorage, AK 99524-4027 3800 Centerpoint Drive Suite 100 Anchorage, AK 99503 ]ennifer.starck@hilcorp.com Phone:907/777-8497 Fax:907/777-8310 Attached for your review is the 2021 "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 2021 gas storage operations. The 51-5 gas storage reservoir was in active use for all of 2021 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 fmd injection and production data for 2021. 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 2021 consistently match the historical P/Z trend established by past performance of this reservoir. Sincerely, Daniel Taylor Reservoir Engineer, P.E. 143467 Attachments: 1) Pretty Creek Unit #4 Production/Injection Volumes 2) 51-5 P/Z Data 3) 51-5 P/Z vs Cumulative Production Plot N N O N m N N r-I U C cO G t u f0 i� I 1 1 �a a +° e ti y d 4 Vl � 7 ;ts a°Z r --LLr7 1 � 1 (p}3sw) uoporul / uoi43npoad O 8 N N O t O N 7 7 a ei N W C 7 N f0 2 N s u 2 N �0 c �o ATTACHMENT #2 -- PCU P/Z DATA (51-5 Sand) Parameter ValueAmidrwrf OH-MD OH -ND Gas Gravity 0.563 5152 3679 (Bench Datum 5152 5162 3685Datum Temp. 106 51721 3692 Avg Temp. 83 Wellname Date Test Type MT upsia at Z Factor patum ure Psia Cum Gas, bcf PrZ, Psia 2002 - 05 Primary Production PCU 4 450, 51-5, 55-6 02/03/02 1457 0.8533 1457 0.2500 1707 PCU 4 4M a 51s PCU 4 4s-o a 51-5 05/11/02 04/10/03 1270 1026 0.8661 0.8862 1270 1026 0.8600 1.7200 1466 1158 PCU 4 45-0 5r712003 1095 0.8801 1095 1.7300 1244 PCU 4 45-0 PCU 4 51-5 PCU 4 51-5 04/20/04 07/06/04 09/20/04 687 1021 910 0.9196 0.8866 0.8970 687 1021 910 2.0300 0.8700 1.0000 747 1152 1015 PCU 4 51-5 02/07/05 683 0.9200 683 1.2900 742 PCU 4 51-5 02/13/05 669 0.9215 669 1.3000 726 PCU 4 51-5 09/30/05 475 0.9429 475 1.6500 504 200612007 Productlonlinjection Cycle Wellname Date Test Type Pressure at MTD, psia Z FactorDatum Pressure, Psia Cum Gas, bcf P2, Psia PCU 4 51-5 102/09/06 726 0.9154 726 1.3000 793 PCU 4 51-5 05/03/06 1061 0.8831 1061 1.0260 1201 PCU 4 51-5 09/27/06 1222 0.8697 1222 1 0.8842 1405 PCU 4 51-5 10/11/06 1246 0.8679 1246 0.7985 1436 IPCU 4 51-5 10/24/06 1257 0.8671 1257 0.7826 1450 IPCU 4 51-5 11/07/06 1360 0.8596 1360 0.6621 1582 ,PCU 4 51-5 11/10/06 1350 0.8603 1350 0.6598 1569 PCU 4 51-5 11/20/06 1354 0.8601 1354 0.6355 1574 PCU 4 51-5 12/03/06 1363 0.8594 1363 0.6174 1586 PCU 4 51-5 12/20/06 1406 0.8566 1406 0.5440 1641 PCU 4 51-5 12/24/06 1419 0.8557 1419 0.5310 1658 PCU 4 51-5 12/28/06 1414 0.8560 1414 0.5269 1652 PCU 4 51-5 01/08/07 1436 0.8546 1436 0.5091 1680 PCU 4 51-5 02/05/07 1482 0.8518 1482 0.4351 1740 PCU 4 51-5 05/07/07 1589 0.8459 1589 0.1765 1879 PCU 4 51-5 06/05/07 1629 0.8438 1629 1 0.0708 1930 PCU 4 51-5 12/12/07 r 1595 0.8455 1595 J 0.0077 1886 2008 Production Cycle PCU 4 51-5 101/01/08 1567 0.8470 1567 0.0440 1850 PCU 4 51-5 101/22/08 1544 0.8483 1544 0.0783 1820 PCU 4 51-5 02/25/08 1442 0.8543 1442 0.2623 1688 PCU 4 51-5 04/28/08 1458 0.8533 1458 0.2686 1709 2008 In ectian Cycle PCU 4 51-5 'PCU 4 51-5 PCU 4 51-5 05/17/08 1 06/23/08 06/26/08 1501 1600 1599 0.8507 0.8453 0.8453 1501 1600 1599 0.2120 0.0484 0.0442 1764 1893 1892 PCU 4 51-5 07/31/08 1658 0.8425 1658 -0.0775 1968 PCU 4 51-5 08/07/08 1655 0.8526 1655 -0.0770 1941 PCU 4 51-5 09/22/08 1616 0.8445 1616-0.0765 1914 2009 Production Cycle PCU 4 51-5 02/19/09 1265 0.8665 1265 0.4747 1460 2009 Injection Cycle PCU 4 51-5 04/08/09 0.8643 1294 0.4747 1497 PCU 4 51-5 11/30/09 1652 0.8428 1652 -0.1267 J 1960 2010 Production Cycle PCU 4 51-5 02/21/10 1624 0.8441 1624-0.1256 1924 PCU 4 51-5 06/24/10 1622 0.8442 1622-0.1060 1921 2010 Injection Cycle PCU 4 51-5 09/01/10 1805 0.8365 1805 -0.4467 2158 PCU 4 51-5 10/15/10 SITP 1660 0.8424 1861 -0.6671 2209 PCU 4 51-5 11/01/10 1858 0.8347 1858 -0.6671 2226 2011 Production Cycle PCU 4 51-5 07/05/11 1 0.8434 1638 -0.1256 1942 2011 Injection Cycle PCU 4 51-5 111/01111 ISITP 1688 0.8337 1893 -0.7611 2271 2012 Production / injection 'Wellname Date Test Type MTD, psia Pressure at Z Factor Datum Pressure, Psia I Cum Gas, bcf P2, Psia PCU 4 51-5 02/22/12 SITP 1660 0.8676 1660 -0.4324 1913 PCU 4 51-5 04/16/12 SITP 1585 0.8707 1585 -0.2582 1820 PCU 4 51-5 05/18/12 SIBHP 1536 0.8487 1536 -0.2007 1810 PCU 4 51-5 06/12/12 SITP 1522 0.8735 1522 -0.1257 1742 PCU 4 51-5 07/15/12 SITP 1534 0.8730 1534 -0.1243 1757 PCU 4 51-5 08/07/12 SITP 1578 0.8710 1578 -0.1759 1812 PCU 4 51-5 09/05/12 SITP 1606 0.8698 1606 -0.2214 1846 PCU 4 51-5 10/21/12 SITP 1594 0.8456 1594 -0.2037 1885 PCU 4 51-5 12/31/12 SITP 1356 0.8821 1356 0.1452 1537 2013 Production / Injection 'Wellname Date Te;Type Pressure at MTD, psia Z Factor Datum Pressure, Psia Cum Gas, bcf P2, Psia PCU 4 51-5 01/19/13 SI 1411 0.8779 1411 0.1136 1607 PCU 4 51-5 02/04/13 SI 1383 0.8794 1383 0.1444 1573 PCU 4 51-5 04/19/13 SITP 1416 0.8776 1416 0.1366 1614 PCU 4 51-5 06/20/13 SITP 1519 0.8724 1519 -0.0057 1741 PCU 4 51-5 07/20/13 SITP 1519 0.8724 1519 -0.0057 1741 PCU 4 51-5 08/10/13 SITP 1519 0.8724 1519 -0.0057 1741 PCU 4 51-5 09/20/13 SITP 1527 0.8720 1527 -0.0222 1751 PCU 4 51-5 11/10/13 SITP 1527 0.8720 1527 -0.0222 ]1751PCU 4 51-5 12/21/13 SITP 1445 0.8760 1445 0.0881 649 2014 Production / Ire ection 'Wellname Date Test Type Pressure at MTD, psia Z Factor Datum Pressure, Psia Cum Gas, bcf P2, Psia iPCU 4 51-5 01/01/14 SITP 1390 0.8704 1390 0.1266 1597 ,PCU 4 51-5 02/01/14 SITP 1405 0.8694 1405 0.1266 1616 PCU 4 51-5 03/01/14 SITP 1376 0.8712 1376 0.0812 1579 PCU 4 51-5 04/05/14 SITP 1437 0.8675 1437 0.1419 1656 PCU 4 51-5 05/01/14 SITP 1431 0.8679 1431 0.1419 1649 PCU 4 51-5 06/01/14 SITP 1431 0.8679 1431 0.1419 1649 PCU 4 51-5 07/01/14 SITP 1431 0.8679 1431 0.1419 1649 PCU 4 51-5 08/01/14 SITP 1434 0.8677 1434 0.1419 1653 PCU 4 51-5 09/01/14 SITP 1437 0.8675 1437 0.1419 1656 PCU 4 51-5 10/15/14 SITP 1 1379 0.8711 1379 0.0656 1583 PCU 4 51-5 11/01/14 1 SITP 1354 0.8726 1354 0.0377 1552 PCU 4 51-5 12/31/14 SITP 1490 0.8645 1490 0.1925 1724 2015 Production / Injection Wellname Date Test Type Pressure at MTD, psia Z Factor Datum Pressure, Psia Cum Gas, bcf P2, Psia PCU 4 51-5 01/01/15 SITP 1489 0.8645 1489 0.1925 1723 PCU 4 51-5 02/21/15 SITP 1451 0.8667 1451 0.2288 1674 PCU 4 51-5 03/01/15 SITP 1451 0.8667 1451 0.2288 1674 IPCU 4 51-5 04/11/15 SITP 1456 0.8664 1456 0.2288 1681 PCU 4 51-5 05/11/15 SITP 1361 0.8722 1361 0.3506 1561 PCU 4 51-5 06/23/15 SITP 1437 0.8675 1437 0.2853 1657 PCU 4 51-5 07/29/15 SITP 1425 0.8682 1425 0.2950 1642 PCU 4 51-5 08/16/15 SITP 1407 0.8693 1407 0.3196 1618 PCU 4 51-5 09/01/15 SITP 1415 0.8688 1415 0.3174 1629 PCU 4 51-5 12/08/15 SITP 1300 0.8762 1300 0.4889 1483 PCU 4 51-5 12/22/15 SITP 1336 0.8738 1336 0.4601 1529 2016 Production / Injection Wellname Date Test Type Pressure at MTD, psia Z Factor Datum Pressure, Psia Cum Gas, bd P2, Psia PCU 4 51-5 05/13/15 SITP 0•3464 PCU 4 51-5 09/11/15 SITP 1302 0.8485 1423 0.2682 1677 IPCU 4 51-5 11/23/15 SITP 1172 0.8594 1279 0.4513 1488 PCU 4 51-5 12/08/15 SITP 1193 1 0.8575 1302 0.4379 1518 PCU 4 51-5 12/22/15 SITP 1226 0.8547 1339 0.4091 1567 PCU 4 51-5 05/24/16 SITP 1252 0.8526 1367 0.3838 1603 PCU 4 51-5 07/05/16 SITP 1410 0.8404 1542 0.1823 1835 PCU 4 51-5 08/30/16 SITP 1460 0.8370 1597 0.0237 1908 PCU 4 51-5 11/24/16 SITP 1431 0.8389 1566 0.0594 1867 PCU 4 51-5 12/31/16 SITP 1317 0.8473 1440 0.2370 1700 2017 Production 1 Injection Wellname Date Test Type Pressure at MTD, psia Z Factor Datum Pressure, Psia Cum Gas, bcf P2, Psia PCU 4 51-5 03/03/17 SITP 1311 0.8665 1455 0.2562 1679 PCU 4 51-5 07/14/17 SITP 1400 0.8610 1554 0.0840 1805 IPCU 4 51-5 10/30/17 SITP 1400 0.8610 1554 0.0840 1805 IPCU 4 51-5 12/28/17 SITP 1392 f 0.8615 1545 0.0929 1793 'PCU 4 51-5 12/31/17 SITP 1387 0.861E 1539 0.0964 1786 2018 Production / Injection Wellname Date Test Type Pressure at MTD, psia Z Factor Datum Pressure, Psia Cum Gas, bcF P2, Psia PCU 4 51-5 01/11/18 SITP 1378 0.8494 1532 0.0964 1803 PCU 4 51-5 01/21/18 SITP 1394 0.8484 1550 0.0964 1826 PCU 4 51-5 02/04/18 ISITP 1380 0.8493 1534 0.1086 1806 PCU 4 51-5 02/13/18 SITP 1387 0.8488 1542 0.1086 1816 PCU 4 51-5 03/02/18 SITP 1386 0.8489 1541 0.1086 1815 PCU 4 51-5 04/09/18 SITP 1306 0.8544 1451 0.2297 1698 PCU 4 51-5 09/27/18 ISITIR 1332 1 0.8525 1480 I 0.2297 1736 PCU 4 51-5 11/20/18 SITP 1338 0.8521 1487 0.2205 1 1745 PCU 4 51-5 12/31/18 SITP 1294 0.8553 1438 0.2906 1681 2019 Production / Injection Wellname Date Test Type MTD, psia Pressure at Z Factor 'Datum Pressure, Psia Cum Gas, bcf P2, Psia PCU 4 51-5 01/06/19 SITP 1296 0.8616 1438 0.2906 1669 PCU 4 51-5 05/15/19 SITP 1279 0.8629 1419 0.3441 1645 PCU 4 51-5 09/08/19 SITP 1277 0.8631 1417 0.3373 1642 PCU 4 51-5 09/19/19 SITP 1254 0.8649 1392 0.3710 1609 PCU 4 51-5 10/09/19 SITP 1288 0.8622 1429 0.3361 1658 PCU 4 51-5 12/13/19 SITP 1283 0.8626 1424 0.3467 1650 PCU 4 51-5 12/31/19 SITP 1220 0.8677 1354 0.4249 1561 2020 Production / Injection 'Wellname Date Test Type Pressure at MTD, psia Z Factor Datum Pressure, Psia Cum Gas, bcr P2, Psia PCU 4 51-5 02/13/20 SITP 1042 0.8729 1157 0.5142 1326 PCU 4 51-5 03/12/20 SITP 984 0.8785 1093 0.6057 1245 PCU 4 51-5 08/27/20 SITP 1140 0.8640 1266 0.4794 1465 PCU 4 51-5 10/06/20 ISITP 1180 0.8605 1310 0.4488 1522 PCU 4 51-5 11/30/20 1 SITP 1194 0.8594 1325 0.4249 1542 2021 Production / Injection Wellname Date Test Type MT up psre ia Z Factor PressurePsia Cum Gas, bcf PIZ, Psia PCU 4 51-5 03/04/21 SITP 823.7926867 0.9022 824 0.8850 913 PCU 4 51-5 03/05/21 SITP 849.2014361 0.8996 849 0.8850 944 'PCU 4 51-5 03/27/21 SITP 869.0865444 0.8975 869 0.8850 968 'PCU 4 51-5 03/28/21 SITP 869.0865444 0.8975 869 0.8850 968 PCU 4 51-5 03/29/21 SITP 872.4007291 0.8972 872 0.8850 972 PCU 4 51-5 03/30/21 SITP 871.2960009 0.8973 871 0.8850 971 PCU 4 51-5 04/13/21 SITP 1221.494852 0.8643 1221 0.8283 1413 PCU 4 51-5 04/14/21 SITP 976.2451834 0.8867 976 0.8283 1101 PCU 4 51-5 04/15/21 SITP 966.3026293 0.8877 966 0.8283 1089 PCU 4 51-5 04/16/21 SITP 967.4073575 0.8876 967 0.8283 1090 PCU 4 51-5 06/15/21 SITP 1292.197459 0.8585 1292 0.5355 1505 PCU 4 51-5 06/16/21 SITP 1296.616372 0.8581 1297 0.5355 1511 PCU 4 51-5 07/04/21 SITP 1552.913323 0.8400 1553 0.4576 1849 PCU 4 51-5 07/05/21 SITP 1359.585882 0.8533 1360 0.4576 1593 PCU 4 51-5 07/06/21 SITP 1359.585882 0.8533 1360 0.4576 1593 PCU 4 51-5 107/07/21 SITP 1351.852784 0.8538 1352 0.4576 1583 PCU 4 51-5 107/08/21 SITP 1348.538599 0.8541 1349 0.4576 1579 PCU 4 51-5 07/09/21 SITP 1348.538599 0.8541 1349 0.4576 1579 PCU 4 51-5 07/10/21 SITP 1348.538599 0.8541 1349 0.4576 1579 PCU 4 51-5 07/11/21 SITP 1349.643327 0.8540 1350 0.4576 1580 PCU 4 51-5 07/12/21 SITP 1347.433871 0.8542 1347 0.4576 1577 PCU 4 51-5 07/17/21 SITP 1376.156805 0.8520 1376 0.4396 1615 PCU 4 51-5 07/18/21 SITP 1376.156805 0.8520 1376 0.4396 1615 PCU 4 51-5 07/19/21 SITP 1366.214251 0.8528 1366 0.4396 1602 PCU 4 51-5 08/01/21 SITP 1365.109523 0.8528 1365 0.4396 1601 IPCU 4 51-5 68/30/21 -SITP 1 1365.109523 0.8528 1365 0.4601 1601 PCU 4 51-5 09/01/21 SITP 1 1365.109523 0.8528 1365 0.4601 1601 O d N d m u C v E t U m a
