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2016 Pretty Creek
Hilcorp Alaska, LLC February 1, 2017 FEB 0 9 2017 Mrs. Cathy Foerster, Chair Alaska Oil and Gas Conservation Commission 333 W. 7th Avenue, Suite 100 Anchorage, AK 99501 Re: 2016 Annual Material Balance Calculations Pretty Creek Gas Storage Facility, Pretty Creek Unit #4 Dear Commissioner Foerster: Post Office Box 244027 Anchorage, AK 99524-4027 3800 Centerpoint Drive Suite 100 Anchorage, AK 99503 vhughes@hilcorp.com Phone: 907/777-8445 Fax: 907/777-8310 Attached for your review is the 2016 "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 2016 gas storage operations. The 51-5 gas storage reservoir was in active use for all of 2016 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 monthly injection and production data for 2016. 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. As of December 31, 2016 the estimated reservoir pressure in the 51-5 was approximately 1440 psig as estimated with a shut in tubing pressure taken on 12/31/2016. All production and injection cycles performed in 2016 consistently match the historical P over Z trend established by past performance of this reservoir. These data points are plotted with the historical data and they conform to the overall curve as shown in the attached figure in red squares. Sincerely, Jim Young Reservoir Engineer Vanessa Hughes Reservoir Engineer Attachments: 1) Pretty Creek Unit #4 Production/Injection Volumes 2) 51-5 P/Z Data 3) 51-5 P/Z vs Cumulative Production Plot I r - r -I LL C (p _ O O O O O �O O 00 l6 4 N O N pj:)Sww c O U O L- CL CL c O U N ATTACHMENT #2 -- PCU POZ DATA (51-5 Sand) Parameter Value Units Gas Gravity 0.563 1707 Bench Datum 5152 ft (tvd) Datum Temp. 106 °F Avg Temp. 83 -F OH -- MD OH --TVD Top midperf Bottom Primary Production PCU 4 45-0, 51-5, 55-6 02/03/02 1457 0.8533 Test Gauge 1707 PCU 4 45-0&51-5 05/11/02 1270 0.8661 Wellname Date Test Type Duration Measured Pressure at Z Factor Datum Cum Gas, bcf P/Z, Psia PCU 4 45-0 5/7/2003 1095 (hrs) Test Depth MTD, psia 1244 Pressure, Psia 04/20/04 687 0.9196 687 2.0300 747 MTD ft 07/06/04 1021 0.8866 1021 0.8700 Primary Production PCU 4 45-0, 51-5, 55-6 02/03/02 1457 0.8533 1457 0.2500 1707 PCU 4 45-0&51-5 05/11/02 1270 0.8661 1270 0.8600 1466 PCU 4 45-0 a 51-5 04/10/03 1026 0.8862 1026 1.7200 1158 PCU 4 45-0 5/7/2003 1095 0.8801 1095 1.7300 1244 PCU 4 45-0 04/20/04 687 0.9196 687 2.0300 747 PCU 4 51-5 07/06/04 1021 0.8866 1021 0.8700 1152 PCU 4 51-5 09/20/04 910 0.8970 910 1.0000 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 2006/2007 Injection Cycle PCU 4 51-5 02/09/06 726 0.9010 789 1.3000 875 PCU 4 51-5 05/03/06 1061 0.8620 1157 1.0260 1342 PCU 4 51-5 09/27/06 1222 0.8460 1334 0.8842 1577 PCU 4 51-5 10/11/06 1246 0.8440 1361 0.7985 1613 PCU 4 51-5 10/24/06 1257 0.8430 1373 0.7826 1629 PCU 4 51-5 11/07/06 1360 0.8340 1487 0.6621 1783 PCU 4 51-5 11/10/06 1350 0.8350 1476 0.6598 1768 PCU 4 51-5 11/20/06 1354 0.8350 1480 0.6355 1772 PCU 4 51-5 12/03/06 1363 0.8340 1490 0.6174 1787 PCU 4 51-5 12/20/06 1406 0.8310 1538 0.5440 1851 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 1 1629 0.8438 1629 0.0708 1930 PCU 4 51-5 12/12/07 1 1595 0.8455 1595 0.0077 1886 2008 Production Cycle PCU 4 51-5 01/01/08 1567 0.8470 1567 0.0440 1850 PCU 4 51-5 01/22/08 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 Injection Cvcle PCU 4 51-5 05/17/08 1501 0.8507 1501 0.2120 1764 PCU 4 51-5 06/23/08 1600 0.8453 1600 0.0484 1893 PCU 4 51-5 06/26/08 1599 0.8453 1599 0.0442 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 1 1616 0.8445 1616 -0.0765 1914 2009 Production Cycle PCU 4 51-5 02/19/09 1 1265 0.8665 1265 0.4747 1460 2009 Injection Cycle PCU 4 51-5 04/08/09 1 1 0.8643 1 1294 0.4747 1497 PCU 4 51-5 11/30/09 1 1652 1 0.8428 1 1652 -0.1267 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 1 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 1 -0.1256 1942 2011 Iniection Cvcle PCU 4 51-5 11/01/11 ISITP 1688 0.8337 1893 1 -0.7611 2271 2012 Storage PCU 4 51-5 0.2682 1677 PCU 4 51-5 0.4513 1488 PCU 4 51-5 PCU 4 51-5 02/22/12 SITP 1660 0.8676 1660 -0.3797 1913 PCU 4 51-5 04/16/12 SITP 1585 0.8707 1585 -0.2069 1820 PCU 4 51-5 05/18/12 SIBHP 5152 1536 0.8487 1536 -0.1475 1810 PCU 4 51-5 06/12/12 SITP 1522 0.8735 1522 -0.0718 1742 PCU 4 51-5 07/15/12 SITP 1534 0.8730 1534 -0.0698 1757 PCU 4 51-5 08/07/12 SITP 1578 0.8710 1578 -0.1203 1812 PCU 4 51-5 09/05/12 SITP 1606 0.8698 1606 -0.1647 1846 PCU 4 51-5 10/21/12 SITP 1594 0.8456 1594 -0.1352 1885 PCU 4 51-5 12/31/12 SITP 1356 0.88208 1356 0.2194 1537 2013 Storage PCU 4 51-5 01/19/13 SITP 1411 0.8779 1411 0.1853 1607 PCU 4 51-5 02/04/13 SITP 1383 0.8794 1383 0.2206 1573 PCU 4 51-5 04/19/13 SITP 1416 0.8776 1416 0.2196 1614 PCU 4 51-5 06/20/13 SITP 1519 0.8724 1519 0.0789 1741 PCU 4 51-5 07/20/13 SITP 1519 0.8724 1519 0.0789 1741 PCU 4 51-5 08/10/13 SITP 1519 0.8724 1519 0.0789 1741 PCU 4 51-5 09/20/13 SITP 1527 0.8720 j 1527 j 0.0625 1751 PCU 4 51-5 11/10/13 SITP 1527 0.8720 1527 0.0625 1751 PCU 4 51-5 12/21/13 SITP 1445 0.8760 1445 0.1716 1649 zu i o-zu l u vroauction & Injection ume Wellname Date 09/11/15 11/23/15 12/08/15 12/22/15 05/24/16 07/05/16 08/30/16 11/24/16 12/31/16 Test Test Type Duration (hrs) SITP SITP SITP SITP SITP SITP SITP ISITP SITP Gauge Measured Test Depth (MTD),ft Pressure at MTD, psia 1302 1172 1193 1226 1252 1410 1460 1431 1317 Z Factor 0.8485 0.8594 0.8575 0.8547 0.8526 0.8404 0.8370 0.8389 0.8473 Datum Pressure, Psia 1423 1279 1302 1339 1367 1542 1597 1566 1440 Cum Gas, bcf P/Z, Psia PCU 4 51-5 0.2682 1677 PCU 4 51-5 0.4513 1488 PCU 4 51-5 0.4379 1518 PCU 4 51-5 0.4091 1567 PCU 4 51-5 0.3838 1603 PCU 4 51-5 PCU 4 51-5 PCU 4 51-5 PCU 4 51-5 0.1823 1835 1908 1867 1700 0.0237 0.0594 0.2370 m xt v E t U f6 �+ �+ Q
