Department of Commerce, Community, and Economic Development
Alaska Oil and Gas Conservation Commission
Loading...
HomeMy WebLinkAbout2007 Pretty CreekChevron
February 6, 2008
Gary A. Orr
Reservoir Engineer
MidContinent/Alaska SBU
Mr. John Norman, Commissioner
Alaska Oil and Gas Conservation Commission
333 W. 7t" 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
ie_.
(*
Alaska Oil & Gas�Co'SeGommission
ASC
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, 2007 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, 2007. 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These values are plotted versus net cumulative gas withdrawn on the standard P/Z plot in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.
Gas injection was initiated into the 51-5 sand in PCU#4 on November 15, 2005 and by July
1, 2007 the reservoir was within approximately .19 BCF of being full. In October gas
withdrawals for the 2007/2008 winter season commenced. A shut-in tubing pressure
measurement on 12/12/07 measured 1460 psig, which converts to a bottomhole reservoir
pressure of 1595 psia. Note in Attachment #3 that the reservoir pressures measured
during the injection cycle deviate above the straight line path established with the primary
depletion points, as expected. As the reservoir filled up the reservoir pressures were
converging on the original reservoir pressure demonstrating reservoir confinement of the
gas storage volumes.
Please contact Gary Orr at 263-7800 if you have any questions.
Sincerely, -
G fl
Reservoir Engineer
Cc: Dave Whitacre
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)
Monthly
Monthly
Cum
Monthly Monthly
Cum
Gas
Gas
Gas
Gas Gas
Gas
DATE
Prod
Inj
Withdrawn
DATE
Prod Inj
Withdrawn
MCF
MCF
MCF
MCF MCF
MCF
December -01
80,465
80,465
January -07
49,440 85,109
2,006,079
January -02
195,929
276,394
February -07
3,706 85,162
1,924,623
February -02
196,257
472,651
March -07
58,089 74,450
1,908,262
March -02
220,869
693,520
April -07
- 184,212
1,724,050
April -02
165,533
859,053
May -07
116,641
1,607,409
May -02
26,375
-
885,428
June -07
64,573
1,542,836
June -02
31,104
-
916,532
July -07
-
1,542,836
July -02
10,746
-
927,278
August -07
-
1,542,836
August -02
-
-
927,278
September -07
1,542,836
September -02
33,163
-
960,441
October -07
377
1,543,213
October -02
183,163
-
1,143,604
November -07
104
1,543,317
November -02
157,256
-
1,300,860
December -07
37,071
1,580,388
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
R
R
D
N
a
N
0)
E
E
O
U
An
a
N
a
@a
75 o v
Ear
7 N
U m
U
E
> > s
N CL
(D (D
N
N
F-
E E
7
❑
07 N
� N
7 CL
N ❑
N F
m :3ca F—
N Q
i� a)
Z
a�
F -
Z5
I
I
0) I
❑ I
1
E I
C
I
I
o
s
E
o
a
W
a
a
a
a
a
a
a
n
m
16
y
0
o
E=
a
a
=
a
c
s
E
E
E
E
y
o
u
o
v
�-
N
>
c
>
c
-
n
c
-
-
n
c
N
�
-
-
a
y
a
a
p
~
K
E
a
a
O
N
o
s
s
a
O
o
M
0
N
0
0
0
o-
t0
'
a�
n
d
3
m
3
v
3
d.
3
3
a�
oo
o
d
3
d
3
m
=
N
N
N
a
a
r
_
5
3
n
`N
T
O
rn
rn
rn
Vco
T
T
O
V N
cD
Lh
V
a
a
a
a
a
a
a
a
a
a
a
LO
co
N
CM
-
-
Om
O(O
N
o
r
n
O
co
O
N
m 0
co
O
t
M
i
m
N
O
a.
o
N
0
hOO
00
LOQ
M
fl-
OcomLo
1l -N
LO
f -
Nm
W
N
Om
ap0r
mOM
V
N
O
O
�m�m(DCDv
co
O
00
co
N
m0m(00mmm
Cl) 0000 M 00
r!
V
V
V V
LO
(0
W
M
N
00
N
NMmNN
m
m
N
V In
V
ooeoeoe
O
Mwwmmm
ION
V
000
Co
0
0
0
0
0 0
mmmmm
m
O)
00
00
O
nLOLO(O
I-
r
0
0
0
0
M
0
0
LO
0
(O
0
(O
W
(D
co
(D
0 0
(D (D
MMM
0
0
m
MMM
0
0
M
M M
00
W
NO
0O
Ln
M LO
N
N
r"
N
1:1
O
M
M
M
N
cD 1�
cD
N
0
0
0
m
0
0
0 V
0
N
0
0
0
0
0
0 0
N
V
V
V
V
Lf)
VV
do)
O
fir
C
C
C
C
C
0
0
0
N
0
N0)
0
N0)
lO(O
NNNNN
CO
W
CO
co:,)0M00cDmMN
CO
0
N
OI00(ON
(D
LO
Q
N
c,4
mm
U
U
U
lO lO
col
col
col
col
00001b
0000
0000000000000000000
LOtO
-O
In
m
N
0
0
m
LO
LO
N
aaaaaaaaZ)
LO
N 0 0 0 (O
co
00
00
0000000000000
_
�=t-F
co
�F-F-m
m
m
U
mtN(n(n
m
—
—
U
—
—
T
Fn
0
co
0
co
0
c`")
0
co
tcn(n(�
Mt
U
o
m
>>
cn
LO
0O0
cn
mLOV
11
N
co
0
LO
Lo Lo
V
M
V
V
00
m
m
iO in (D m 0
V
O(
N
cS
NNNN N
M�
ONNNNSco
M
M V V V cF
NN
I
O')
N
N
N
N
N
N
N
N
N
V
V
7
V
V
7
V
V
V V
0
(D
w
0
0
0
0
(D
0 (D (O 0 (D
U
U
U
U
U
U
U
U
U U
aaaaaaaaaa
-
-
-
- - - (O -
o
E
o
a
a
a
a
a
a
a
a
o
E=
E
E
E
E
E
E
E
`m
>
c
>
c
-
n
c
-
-
n
-
-
n
-
-
y
m
n
w
n
m
a
N
o
s
s
a
s
o
0
0
0
0
0
0
E
$
t0
'
a�
n
d
3
m
3
v
3
d.
3
3
m
3
m
3
d
3
d
3
d
3
d
3
=
_
5
_
5
5
`N
T
T
rn
rn
rn
rn
T
T
rn
rn
3
o
a
a
a
a
a
a
a
a
a
a
a
N
N
N
a
M
r
N
of
� t.
N
t
M
L
N
t
M
i
m
o
of
N
a.
o
N
0
N
00
N
M
fl-
m
1l -N
V
m0O
O Or Mr
Om
mOM
V
P�
co
n
00
co
N
0N
Cl) 0000 M 00
r!
V
V
iOM
iO0000r
W Mm W
NM
O
ION
V
04
V
Mm0mm
0
V
N
O
m
O)
00
00
00
00
I-
r
n
n
(D Cl) M
0
0
0
0
0
0
0
0
0
0
0 0 0 0 0
00
NO
0O
O
't
m0(D
Omv
N O(O m(O
nN
ON
V
10000(DO
m
M0000Nm
�
ONNNMMMM
V
V
V
V
V (O (O0(O
VV
f�
fir
loco)
V O
LO
V
W
0.-m
00
I-
CO
W
CO
co:,)0M00cDmMN
CO
0
0
OI00(ON
(D
LO
LO
0
LO
MM0
LO V VV V
mm
0000
W
00000001b
00001b
0000
0000000000000000000
LOtO
-O
In
0
N
0
0
LO
LO
LO
N
0
LO
N 0 0 0 (O
co
00
00
0000000000000
co
0000000
W aD 00
0
M
0
co
0
co
0
M
0
M
00
M
co
0
co
0
co
0
c")
0
co
0
co
0
c`")
0
co
0 0 0 0 0
M M M M M
Mt
U
o
m
LO
0O0
mLOV
i -V7 ONO
0
V
�O
V
M
V
V
00
m
m
iO in (D m 0
V
M
M V V V cF
NN
N
N
N
N
N
N
N
N
N
N
N
N N N N N
(D
O
0
co
0
0
0
(D
w
0
0
0
0
(D
0 (D (O 0 (D
lO
(O
(O
tO
to
to
F
-1
O
--
-
-
-
- - - (O -
O
�a-aaaaaan.an.n.F-
o�
L
-
F-F.n.n.
(�
--
-
-
-
-
-
-
-
-
-----
m
LO
[ O
c D
00
m0
O
00
00
O
00
O
m0
O
n
ncl*O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O 0 0 0
O 0 0
N
O
N
O
N
N
N
N
N
N
O
N
O
N
N
O
N
V
N
0
O
N
O O O N
N N N N N
m
M
N
N
N
N
N
N
O0
t-- L
N
N
N
0
0
\
d'
V
V
V
V
V
V'
'IT
'7
V
V'
'r
V
VV
V V V V
U
U
U
U
U
U
U
U
U
U
U
U
U
U
00000
a
aaaaaaaaaaaaaaaaaELI
♦m
V
>
m
m
E
V
N
N
a
a
ea
m
■L
W
m
2
�M
V
a
0
r
M
1
N
r
0
0 0 Cl 0 0 0
N o Ln o W)
N N r r
eisd `Z/d
M
N
r
0
i
Q
O
O
LL
-
N
Q
a)
N (0
U Q
U m
o Fu
E
a0i .�
� O
�
CD
>,
U
C
O
U
O
C)
r-
4
0
a
o
a�
0o
Ln
T
U
O
O
O
Q
U
O
O
d
ti
O
i
N
r
N_
0
Q
0 0 Cl 0 0 0
N o Ln o W)
N N r r
eisd `Z/d
M
N
r
0
