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Home My WebLink About2005 Pretty CreekChevron Jeff W. Smetanka Union Oil Company of California Reservoir Engineer P.O. Box Anchoragee,, AK AK 99519-6247 Ift 0.0 Tel 907 263 7622 Fax 907 263 7847 Email smetankaj@chevro (`` �® � FEB 1 3 2006 February 10, 2006 Alosks Oil & Gas Cons. CXnission Anchorage Mr. John Norman Alaska Oil and Gas Conservation Commission 333 W. 7 1 Avenue, Suite 100 Anchorage, AK 99501-3539 RE: ANNUAL MATERIAL BALANCE CALCULATIONS OF PRODUCTION AND INJECTION VOLUMES FOR PCU#4, PRETTY CREEK FIELD Dear Commissioner Norman: Attached for your review is the annual material balance calculation of production and injection volumes for PCU#4, as required per Storage Injection order #4. This material balance covers the primary production period, as well as the November 15, 2005 through December 31, 2005 storage operation period. Attachment #1 is a table of gas production and injection volumes for the PCU#4 well beginning with the commencement of primary production and ending with the data for December 31, 2005. Attachment #2 contains the reservoir pressure estimates over time. These values are plotted versus net cumulative gas withdrawn on the standard P/Z plot in Attachment #3. Injection was commenced into the 51-5 sand in PCU#4 on November 15, 2005 and continued through the end of the year. A shut-in tubing pressure measurement (38 day shut-in) on 2/9/06 measured 650 psig, which converts to a bottomhole reservoir pressure of 726 psia. Note in Attachment #3 that this data point deviates above the straight line path established with the primary depletion points, as expected. The plot demonstrates reservoir confinement of the gas storage volumes. Please contact Jeff Smetanka at 263-7622 if you have any questions. Sincerely, eff W. Smetanka Reservoir Engineer Attachments Union Oil Company of California / A Chevron Company http://www.chevron.com ATTACHMENT #1 - PCU 4 PRODUCTION AND INJECTION VOLUMES Total Cumulative Primary Production (51-5 and 45-0 Sands) DATE Monthly Gas Prod MCF Monthly Gas Inj MCF Cum Gas Withdrawn MCF December -01 80,465 - 80,465 January -02 195,929 - 276,394 February -02 196,257 - 472,651 March -02 220,869 - 693,520 April -02 165,533 - 859,053 May -02 26,375 - 885,428 June -02 31,104 - 916,532 July -02 10,746 - 927,278 August -02 - - 927,278 September -02 33,163 - 960,441 October -02 183,163 - 1,143,604 November -02 157,256 - 1,300,860 December -02 138,233 - 1,439,093 January -03 117,103 - 1,556,196 February -03 85,932 - 1,642,128 March -03 79,775 - 1,721,903 April -03 17,030 - 11738,933 May -03 196 - 1,739,129 June -03 - - 1,739,129 July -03 25,313 - 1,764,442 August -03 20,306 - 1,784,748 September -03 16,087 - 1,800,835 October -03 9,758 1,810,593 November -03 3,544 - 1,814,137 December -03 52,856 - 1,866,993 January -04 57,353 - 1,924,346 February -04 55,318 - 1,979,664 March -04 45,931 - 2,025,595 April -04 - - 2,025,595 May -04 56,583 - 2,082,178 June -04 70,263 - 2,152,441 July -04 21,267 - 2,173,708 August -04 74,030 - 2,247,738 September -04 41,208 - 2,288,946 October -04 83,626 - 2,372,572 November -04 80,884 - 2,453,456 December -04 71,571 - 2,525,027 January -05 62,310 - 2,587,337 February -05 54,328 - 2,641,665 March -05 55,460 - 2,697,125 April -05 57,247 - 2,754,372 May -05 53,045 - 2,807,417 June -05 40,800 - 2,848,217 July -05 40,964 - 2,889,181 August -05 37,981 - 2,927,162 September -05 8,872 - 2,936,034 October -05 - - 2,936,034 November -05 - 59,329 2,876,705 December -05 - 157,700 2,719,005 00 o cco A A N Z C- m n 1 N�0 N Z Q n N N -< O O n m m m m m Cn W C) 07 (n O i0 A J CA N N V CO N A J CD "0 '1, "0 7 -u -u 7 -" "' T , 00000000000 ccccccccccc A A A A A A A A A A A (O (D N N (O J A Cn .p. (\T N N N IV N N N N N N N N 0 0 00 0 0 0 0 0 0 0 0 m 0 (n 0Ln Cn O� A O� A CD CD W N C:, Cl Cl) Ct) m L m � v�WL--iI��W Cf) cn cn cn vc��-u 7: (D C3 W c c 0 o a ri n 0 0 Cn j (n O j N N D Cn Cn (n (D (D N N (D N N N W O O O j> O O 7 7 (D (D 7 (D O O 7 7 N N Ln Cn Cn m O m 0 0 0 0 0 O fn N N N ANmm W (OmOONm J m m N W W O N J N (n (n O m W Ln O Cn co O Cn W m W m W W m m m M W CJ m m 4o Lrlm W cnm OD Ln W m 0o o Ln m W OD (n Cil W Cn m W O W (D O W m O (O O] CO 0 0 0 0 0 0 0 0 0 0 0 m A m m O N CD m N (0 0o O (D N 00 00 00 0o 00 m co (n Ch A m W A A N (D (D (D (0 W N Ln N m N J CO 00 W cc ANm 0) (0 ''mom-'�� O0000NA J Cn 00 (D m CO 00 W O N J CO CnmOJ N J Cn N (D A co A Cn (D Cn N co co — m O W J W J OD N m N (n Cn W J J O' J N A J N O A O � A 00 A A 1 Ln m A W m m N m D a N =1 [ C o a C7 O 3 rD ZT a 0 L. w m v v - o n o � o _ > N < (D 0 0 7 Cp i CD CD m CD (D 2 O 0 N G) (D N D (D Cy N _ N 'O C N. /D D) 61 f11 C N CD 1G � (D Q N N. N N (D cn C7 N C Ct C O l0 CL N C N N 'D N (n N n O 3 3 (D N N v O N w A L" P/Z, psia („O cn O O O O O O N C 0 c 3 C CD AG) N D D C) m z --I w