Department of Commerce, Community, and Economic Development
Alaska Oil and Gas Conservation Commission
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HomeMy WebLinkAbout2006 Pretty CreekChevron
February 22, 2007
Gary A. Orr
Reservoir Engineer
MidContinent/Alaska SBU
Mr. John Norman, Commissioner
Alaska Oil and Gas Conservation Commission
333 W. 7th Avenue, Suite 100
Anchorage, AK 99501-3539
ANNUAL MATERIAL BALANCE CALCULATIONS
OF PRODUCTION AND INJECTION VOLUMES
FOR PCU#4, PRETTY CREEK FIELD
Dear Commissioner Norman:
Chevron North America
Exploration and Production
909 West 9th Avenue
P.O. Box 196247
Anchorage, AK 99519-6247
Tel 907 263 78600
Fax 907 263 7847
Email orrga@chevron.com
RECEIVED
FEB 2 3 2007
Alaska Oil & Gas Cons. Commission
Anchorage
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, 2006 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, 2006. 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These values are plotted versus net cumulative gas withdrawn on the standard P/Z plot in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 2006 with only a few days of withdrawals. With continued
injection the reservoir should be full prior to the 2007/2008 winter. A shut-in tubing
pressure measurement (3 day shut-in) on 1/4/07 measured 1300 psig, which converts to a
bottomhole reservoir pressure of 1436 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 Gary Orr at 263-7800 if you have any questions.
Sincer�ly,
Gary "'.0
Resery it Engineer
GAO:dma
Attachments
MidContinent/Alaska SBU/Chevron North America Exploration and Production 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Withdrawn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
-
1,738,933
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
January -06
-
-
2,719,005
February -06
-
-
2,719,005
March -06
-
104,423
2,614,582
April -06
-
163,320
2,451,262
May -06
-
3,281
2,447,981
June -06
283
-
2,448,264
July -06
292
2,448,556
August -06
292
-
2,448,848
September -06
2,927
59,329
2,392,446
October -06
-
140,560
2,251,886
November -06
3,315
96,880
2,158,321
December -06
-
116,573
2,041,748
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