Department of Commerce, Community, and Economic Development
Alaska Oil and Gas Conservation Commission
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HomeMy WebLinkAbout2007 Deep Creek UnitChevron Kevin A. Tabler Union Oil Company of California
Land/Governmental P.O. Box 1
Affairs Manager Anchorage,, AK AK 99519-6247
Ift1h.— 0.0 Tel 907 263 7600
Fax 907 263 7698
Email tablerk@chevron.com
RECEIVED
MAR 2 7 2008
Alaska Oil & Gas Cons- Comm
Anchorage
March 19, 2008
Daniel Seamount, Chairman
Alaska Oil & Gas Conservation Commission
333 W. 7th Avenue, Suite 100
Anchorage, Alaska 99501-3539
DEEP CREEK UNIT
HAPPY VALLEY FIELD
STATE OF ALASKA
ANNUAL RESERVOIR REVIEW
Dear Commissioner Seamount:
In accordance with Conservation Order No. 553, Union Oil Company of California,
as Operator, respectfully submits the following Annual Reservoir Review for the
Happy Valley Field.
This is the 3rd Annual Reservoir Review. This Review corresponds to events during
the 2007 calendar year. The Happy Valley Field has been on production since
November 2004.
We ask that data provided in Appendix C be kept confidential as it contains
proprietary reservoir information that could be used by competitors in the region.
Production Update
As of December 31St, 2007, the cumulative production from the Happy Valley field is
9,621,806 MCFG and 27,101 BW.
Production is from six (6) wells:
a. HV -A01 - Lower Tyonek Producer.
410 psig FTP.
b. HV -A02 - Lower Tyonek Producer.
Current rate 1.6 MMCFGPD/1 BWPD at
Current rate 0.05 MMCFGPD/0 BWPD at
Union Oil Company of California / A Chevron Company http://www.chevron.com
Daniel Seamount, Commissioner
Alaska Oil & Gas Conservation Commission
March 19, 2008
320 psig FTP.
Beluga Upper Tyonek
c. HV -A08 - Beluga and
Upper
MMCFGPD/39 BWPD at 350 psig FTP.
d. HV -A09 - Upper Tyonek
Producer.
350 psig FTP.
471,187
e. HV -A10 - Upper Tyonek
Producer.
500 psig FTP.
HV -A09
f. HV -A11 - Upper Tyonek
Producer.
350 psig FTP
3,992,291
Tyonek Producer. Current rate .90
Current rate 1.3 MMCFGPD/1 BWPD at
Current rate 3.0 MMCFGPD/0 BWPD at
Current rate 0.1 MMCFGPD/0 BWPD at
Attached in Appendix A is a production graph for each well. Note that the
production rate increases evident on the plots reflect the start-up of compression
operations on the "A" pad at the end of 2006.
Reservoir Pressure
The average reservoir pressure is estimated to be 1561 psig at year-end 2007.
This pressure is based on the HV -A10 well and corresponds to the 6700' TVD datum
referenced in CO #553. The HV -A10 well produces dry gas with no fluid and thus is
an excellent pressure measurement point. The HV -A10 pressure was last measured
on May 18, 2006 at 2150 psig. The year-end pressure was estimated using the
established trend on the P/Z plot (Appendix C).
Cumulative Production
The cumulative gas volumes sub -divided by bench as of 12-31-2007 are as follows:
Reserves
The Happy Valley field wells are generally produced on a continual basis. Well rates
are not usually varied. Due to the low quality of these reservoirs, the wells are
produced to maximize drawdown and rate. Shut-ins are generally brief as to
prevent any cross flow and potential reservoir damage. However, every
opportunity to obtain a static reservoir pressure is captured for reserve
quantification. A P/Z graph for three (3) of the producing wells is attached in
Appendix C (HV -A1, HV -A2, and HV -A10). Material Balance work in conjunction
with decline curve analysis is used to quantify reserves for the Happy Valley field;
however, the low well rates and high pipeline pressure render a greater degree of
uncertainty to the HV reserves.
Union Oil Company of California / A Chevron Company http://www.chevron.com
Beluga Upper Tyonek
Lower Tyonek
HV -A01
2,414,777
HV -A02
471,187
HV -A08
450,353 675,529
HV -A09
1,553,180
HV -A10
3,992,291
HV -A11
64,489
Cum Gas Volume
MCF
450,353 6,285,489
2,885,964
Reserves
The Happy Valley field wells are generally produced on a continual basis. Well rates
are not usually varied. Due to the low quality of these reservoirs, the wells are
produced to maximize drawdown and rate. Shut-ins are generally brief as to
prevent any cross flow and potential reservoir damage. However, every
opportunity to obtain a static reservoir pressure is captured for reserve
quantification. A P/Z graph for three (3) of the producing wells is attached in
Appendix C (HV -A1, HV -A2, and HV -A10). Material Balance work in conjunction
with decline curve analysis is used to quantify reserves for the Happy Valley field;
however, the low well rates and high pipeline pressure render a greater degree of
uncertainty to the HV reserves.
Union Oil Company of California / A Chevron Company http://www.chevron.com
Daniel Seamount, Commissioner
Alaska Oil & Gas Conservation Commission
March 19, 2008
As mentioned in the "Production Update" section, compression was installed on the
"A" pad in 2006. Well rates and performance have improved since that time due to
the ability to flow the wells to lower flowing tubing pressures. This investment will
help ensure that reserve recovery of completed sands is maximized.
Reservoir Summary
Beluga - Currently open in solely the HV -A8 well. The HV -A8 well is also producing
from the Upper Tyonek formation. Through downhole measurements 40% of the
gas is associated with the HV -A8 Beluga. The cumulative production from the
Beluga is 0.450 BCF gas and 18,989 BW. Potential uphole Beluga pay exists in the
HV -A9 and HV -A10 wells and may be added as reservoir management allows. Two
wells were drilled from Pad B in 2007 (#12 & #13) that penetrated the Beluga
reservoirs. Initial log analysis indicates Beluga pay in both wells but neither well
has been completed at the time of this report. Additional offset locations may exist
for future development from Pad B.
Upper Tyonek - Currently open in HV -A8, HV -A9, HV -A10, and HV -A11. The
cumulative production from the Upper Tyonek is 6.285 BCF gas and 1,045 BW.
Potential Upper Tyonek pay exists in the HV -A9 and HV -A10 wells. Two wells were
drilled from Pad B in 2007 (#12 & #13) that penetrated the Upper Tyonek
reservoirs. Initial log analysis indicates Upper Tyonek pay in both wells but neither
well has been completed at the time of this report. Additional offset locations may
exist for future development from Pad B.
Lower Tyonek - Currently open in HV -A1 and HV -A2. The cumulative production
from the Lower Tyonek is 2.886 BCF gas and 7,067 BW. The Lower Tyonek has
been tested in HV -A3, HV -A4, HV -A6, HV -A7, and HV -A11. Economically producible
gas in the Lower Tyonek has only been found in wells HV -A1 and HV -A2. One well
was drilled in 2007 (#12) that penetrated the Lower Tyonek reservoirs. Initial log
analysis indicates Lower Tyonek pay but the well has not been completed at the
time of this report.
Pending Projects
Planned 2008 gas development work includes the drilling of two additional gas wells
on the "B" pad and associated lines and equipment to tie the wells back to facilities
on the "A" pad. The drilling of both a water and a cuttings disposal well is also
being considered.
Testing and Monitoring
The Happy Valley wells are tested regularly and reported monthly.
Surveys and diagnostic wireline operations conducted during the year are as
follows:
Union Oil Company of California / A Chevron Company http://www.chevron.com
Daniel Seamount, Commissioner
Alaska Oil & Gas Conservation Commission
March 19, 2008
• HV -A08 - Slickline tag and bailing to remove fill (9/12/07)
No shut-in pressure measurements were taken for the year.
Surface Safety Valve Testing
The SSV's were tested on April 27th, 2007 and October 27th, 2007. Presence of a
witness for the AOGCC was waived in both cases. Currently, the HV SSV's are
operating with approved tests on all SSV's. The SSV test results for 2007 are
attached in Appendix B.
Please direct any questions regarding this plan to Keith Lopez, Reservoir Engineer,
at 263-7653.
Sinerely,
evin A. Tabler
KAT:JWS:dma
Attachments
Union Oil Company of California / A Chevron Company http://www.chevron.com
Daniel Seamount, Commissioner
Alaska Oil & Gas Conservation Commission
March 19, 2008
APPENDIX A
Union Oil Company of California / A Chevron Company http://www.chevron.com
m
Happy Valley #01
10,000
1,000
1,500
1,300
1,100
N
Q
900 N
7
N
N
N
700 a
m
H
500
0
LL
300
100
100 (100)
1/2/2003 7/3/2003 1/2/2004 7/2/2004 1/1/2005 7/2/2005 1/1/2006 7/2/2006 1/112007 7/2/2007 1/1/2008 7/1 /2008 12/31/20 7/1/2009 12/31/20
08 09
Date
• Gas • Pressure
W
M
10,000
1,000
100
Happy Valley #02
u
•
•
10 (1 00)
1/2/2003 7/3/2003 1/2/2004 7/2/2004 1/1/2005 7/2/2005 1/1/2006 7/2/2006 1/1/2007 7/2/2007 1/1/2008 7/1 /2008 12/31/20 7/1/2009 12/31/20
08 09
1,500
1,300
1,100
N
a
900 m
L
N
N
700 rn
C
500 CT)
O
300
100
• Gas * Exponential from "Q Cum Plot"
Date
* Hyperbolic 0.4 Forecast
• Pressure
Happy Valley #08
10,000
1,000
2
° 100
U
U
CL
M
0
10
1
8/1/200 10/31/2 1/30/20 5/1/200 8/1/200 10/3112 1/30/20 5/1/200 8/1/200 10/31/2 1/30/20 5/1/200 8/1/200 10/31/2 1/30/20 4/30/20 7/31/20
4 004 05 5 5 005 06 6 6 006 07 7 7 007 08 08 08
Date
• Gas •TSTFLUID • Pressure
1,500
1,300
500
300
100
(100)
0
LL
•
Nt
« ♦ N
9 RL
•
•
• •wpo•
• :�
•
t • •
•
1
8/1/200 10/31/2 1/30/20 5/1/200 8/1/200 10/3112 1/30/20 5/1/200 8/1/200 10/31/2 1/30/20 5/1/200 8/1/200 10/31/2 1/30/20 4/30/20 7/31/20
4 004 05 5 5 005 06 6 6 006 07 7 7 007 08 08 08
Date
• Gas •TSTFLUID • Pressure
1,500
1,300
500
300
100
(100)
0
LL
2
c
0
U
7
0
^L
LL
0
co
IM
Happy Valley #09
10,000
1,000
2,500
2,000
.N
a
1,500
1,000
;.a]
100 _
1/2/2003 7/3/2003 1/2/2004 7/2/2004 1/1/2005 7/2/2005 1/1/2006 7/2/2006 1/1/2007 7/2/2007 1/1/2008 7/1 /2008 12/31/20 7/1/2009 12/31/20
08 09
Date
• Gas • Pressure
N
LL
�. iL
♦
s,
2,500
2,000
.N
a
1,500
1,000
;.a]
100 _
1/2/2003 7/3/2003 1/2/2004 7/2/2004 1/1/2005 7/2/2005 1/1/2006 7/2/2006 1/1/2007 7/2/2007 1/1/2008 7/1 /2008 12/31/20 7/1/2009 12/31/20
08 09
Date
• Gas • Pressure
N
LL
10,000
U
U)
2
1,000
U
O
Happy Valley #10
s •
«• •s•. •
t
•
r
♦
•
•
100 1 1 1 1 1 _
1/2/2003 7/3/2003 1/2/2004 7/2/2004 1/1/2005 7/2/2005 1/112006 7/2/2006 11112007 7/2/2007 1/1/2008 7/1 /2008 12/31/20 7/1/2009 12/31/20
08 09
5,000
4,000
N
N
N
3,000 a,
C
H
m
c
2,000 0
I
1,000
Date
• Gas • Pressure
ti
1,000
100
Zk
•
•t •
M
10
1/1/2006
Happy Valley #11
2,500
2,000
a
1,500
1,000
500
7/2/2006 1/1/2007 7/2/2007 1/1/2008 7/1 /2008 12/31/2008 7/1/2009 12/31/2009
Date
• Gas • Pressure
N
LL
Daniel Seamount, Commissioner
Alaska Oil & Gas Conservation Commission
March 19, 2008
APPENDIX B
Union Oil Company of California / A Chevron Company http://www.chevron.com
A,-ska Oil and Gas Conservation Comn..csion
Safety Valve System Test Report
Operator: UNOCAL
Operator Rep: Joe Steele
AOGCC Rep: waived
Submitted By: Joe Steele Date: 4/27/2007
Field/Unit/Pad: Happy Valley A
Separator psi: LPS 310 HPS NIS
Well Data
Pilots
SSV
SSSV
TestlRetesIISI Date
Well Type
Well
Number
Permit
Number
Separ
PSI
Set
PSI
UP
Trip
Test
Code
Test
Code
Test
Code
Date Passed Retest
Or Date Shut In
Oil, WAG, GINJ,
GAS, CYCLE, S,
A-1
2030720
310
300
300
P
P
GAS
A-10
2041860
310
300
300
P
P
GAS
A-11
2042070
310
250
250
P
P
GAS
A-2
2031130
310
250
250
P
P
GAS
A-3
2032220
SI
A-4
2032230
SI
A-6
2040440
SI
A-7
2041060
SI
A-8
2041140
310
300
300
P
P
GAS
A-9
2041700
310
250
250
P
P
IGAS
GAS
Wells:
Remarks:
6 Components: 12 Failures: 0 Failure Rate: 0.00% ❑ 90 Day
For valve leak test A-2 and A-11 were depressured to 50 psi through vent stack
due to low tubing pressure.
RJF 12/21/04 Page 1 of 1 SVS HV A 04-27-07.xls
A,-,ka Oil and Gas Conservation Comm.. .ion
Safety Valve System Test Well Pressures Report
Operator: UNOCAL Submitted By: Joe Steele
Operator Rep: Rick Musgrov( Field/Unit/Pad: Happy Valley A
AOGCC Rep: waived Date: 4/27/2007
Well Data
Well Pressures
Gas Lift
Waiver
Comments
Well
Number
Permit
Number
Inner
PSI
Outer
PSI
Tubing
PSI
Yes/No
Yes/No
A-1
2030720
0
0
600
No
A-10
2041860
0
01
550
No
A-11
2042070
0
0
350
No
A-2
2031130
0
0
340
No
A-3
2032220
A-4
2032230
A-6
2040440
A-7
2041060
A-8
2041140
0
0
450
No
A-9
20417001
0
0
400
No
Remarks:
RJF 09/19/02 Page 1 of 1 SVS HV A 04-27-07.xls
Ak.aka Oil and Gas Conservation Comm—cion
Safety Valve System Test Report
Operator: UNOCAL
Operator Rep: Joe Steele
AOGCC Rep: none
Submitted By: Joe Steele Date: 10/27/2007
Field/Unit/Pad: Happy Valley A
Separator psi: LPS 320 HPS NIS
Well Data
Pilots
SSV
SSSV
'Test/Retest/SI Date
Well Type.
Well
Number
Permit
Number
Separ
PSI
Set
PSI
UP
Trip
Test
Code
Test
Code
Test
Code
Date Passed Retest
Or Date Shut In
Oil, WAG, GINJ,
GAS, CYCLE, SI
A-1
2030720
320
300
300
P
P
GAS
A-10
2041860
320
300
300
P
P
GAS
A-11
2042070
320
250
250
P
P
GAS
A-2
2031130
320
250
250
P
P
GAS
A-3
2032220
SI
A-4
2032230
SI
A-6
2040440
Sl
A-7
2041060
Sl
A-8
2041140
320
300
300
P
P
GAS
A-9
2041700
320
250
250
P
P
IGAS
GAS
Wells:
Remarks:
6 Components: 12 Failures: 0 Failure Rate: 0.00% ❑ 90 Day
For valve leak test A-2 and A-11 were depressured to 100 psi through vent stack
due to low tubing pressure.
RJF 12/21/04 Page 1 of 1 SVS HV A 10-27-07.xls
Daniel Seamount, Commissioner
Alaska Oil & Gas Conservation Commission
March 19, 2008
APPENDIX C
Union Oil Company of California / A Chevron Company http://www.chevron.com
