Transcript Behavioral Goals MC or ELT Members
Unocal Alaska Web-Based Gas-Lift Surveillance
Paul Burtis Chris Ruff Scott Herman
February 2002
Unocal Alaska Operations Map
Typical Gas-Lift Completion RKB = 44.3’ Rig Floor to DCB TBG Spool 1 2 3 CASING AND TUBING DETAIL SIZE 17-3/4” 13-3/8” 9-5/8” 9-5/8” 9-5/8” 9-5/8” WT .312W
61 47 40 43.5
47 GRADE J-55 N-80 N-80 N-80 N-80/P-110 CONN Spiral Weld Buttress Buttress Buttress Buttress Buttress Window 7” 4-1/2” 29 11.6
L-80 N-80 TKC-Butt Hydril 511 4-1/2” pre-drilled liner has ½ ” predrilled holes—8 hpf Tubing: 5-1/2” 17.0
L-80 LTC ID 8.681
8.835
8.755
8.681
6.184
3.958
4.892
MD TOP Surf.
Surf.
Surf.
67’ 5,883’ 7,900’ 10,845 10,516 12,257’ 42.9
MD BTM.
600’ 5,802’ 67’ 5,883’ 7,900’ 11,210’ 10,857’ 12,365’ 15,072’ 10,516’ TOL @ 10,516’ 4 7 5 6 4 5 6 7 NO 1 2 3 Depth 42.9’ 304’ 2,875’ 5,064 5,629 6,150’ 6,212’ 6’690’ 6,751’ 7,231’ 7,287’ 7,723 7,821 8,257’ 8,814’ 9,336’ 9,857’ 10,339’ 10,504’ 10,440’ 10,456’ 10,516 ID 4.930” 4.562
4.892” 4.892” 4.892” 4.892” 4.892” 4.892” 4.892” 4.892” 4.892” 4.892” 4.892” 4.892” 4.892” 4.892” 4.892” 4.892” 4.455” 6.00” 4.937” 6.188” JEWELRY Item CIW 5-1/2” DCB Tubing Hanger: 5-1/2” LTC top & btm Baker TE-5 TBG Retrievable SCSSSV #16 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #15 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #14 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #13 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #12 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #11 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #10 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #9 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #8 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #7 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #6 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #5 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #4 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #3 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #2 5-1/2” SF-02 McMurry GLM w/ 1-1/2” R-2 valve #1 5-1/2” SF-02 McMurry GLM w/ orifice Baker ‘XN’ Nipple Baker Model F Permanent Packer with 18 ft seal-bore extension Baker tubing seal assembly (L= 20 ft) Baker tie-back seal assembly (L= 6.70 ft) TOL @ 12,257’ TD = 15,114’ ETD =15,070’ 91
/ 12,805’; 99
/13,281’; 104
/15,049’
Typical Gas-Lift Surveillance Processes
Vendor-Driven
Predominant at Unocal Unocal delegates design and surveillance Results in unknown optimization level
Operator Staff-Driven
Engineer Part-Time
Work typically prioritized downward
Technician Full-Time
Optimum results
Typical Gas-Lift Surveillance Processes
Vendor-Driven
Timetable driven surveillance
Engineering staff typically uninformed about key design and operation parameters
Operators not fully aware of these parameters
Unocal Alaska Gas Lift Program - 2000 Total Rate Gain (boe/day)
2,115
Funds Spent ($ US)
$225,000
# of Jobs
15
Success Rate (%)
87%
Payout (months)
0.3
Unocal Alaska Gas Lift Surveillance Process
Dedicated staffing
Informed decisions based on data
Web-assisted surveillance
Surveillance Program - 2000 PBU’s
7
Flow ing Pressure Traverses
14
N odal Models
25
Acoustic Fluid Levels & 3-Pen Charting
15 •
Optimization work performed on 19% of active gas lift wells in 2000
•
Gas lift diagnostics run on 34% of active gas lift completions
Unocal Alaska Web-Based Surveillance
Unocal Alaska Web-Based Surveillance
Unocal Alaska Web-Based Surveillance
Surveillance Program - 2001 Results
•
Previous program well turnaround = 60 days
•
Current process = 2 days
•
Average production deferment = 50 bopd
•
Deferred yearly program revenue = $480,000
Conclusions
•
Gas lift completions require continuous surveillance to yield optimum returns
•
Web-based technology is available to systematically change current surveillance
•
This technology requires key staff understand their key performance / design parameters