Dual Gas Lift Well Analysis Using WellTracer™ - · PDF fileDual Gas Lift Well Analysis...

33rd Gas-Lift WorkshopHouston, Texas, USAFebruary 1 - 5, 2010

This presentation is the property of the author(s) and his/her/their company(ies).It may not be used for any purpose other than viewing by Workshop attendees without the expressed written permission of the author(s).

Dual Gas Lift Well Analysis Using WellTracer™

Tony Hord

ExxonMobil Production Company

Corporate Separateness

Exxon Mobil Corporation has numerous subsidiaries, many with names that include ExxonMobil, Exxon, Esso and Mobil. For convenience and simplicity in this presentation, the parent company and its subsidiaries may be referenced separately or collectively as "ExxonMobil."

Abbreviated references describing global or regional operationalorganizations and global or regional business lines are also sometimes used for convenience and simplicity.

Nothing in this presentation is intended to override the corporate separateness of these separate legal entities. Working relationships discussed in this presentation do not necessarily represent a reporting connection, but may reflect a functional guidance, stewardship, or service relationship.

Feb. 1 - 5, 2010 2010 Gas-Lift Workshop 3

Dual Gas Lift Well Analysis Using WellTracer™

• WellTracer™ / WinGLUE™ Tools• Dual Well Operations

• WellTracer™ Technology Advantages

• Results of Surveys

• Plans

WellTracer™

• What is WellTracer™? – Patented technology that traces the path of injected CO2 in a producing well.

– Noninvasive method to determine downhole conditions – leaving well flow undisturbed.

• How Does WellTracer™ Work? – Man-portable

– Requires temporary connection points on the gas injection line and the production line.

– CO2 is injected in the annulus and sensed when it returns on the production line

– Well data including tubular design, gas lift valve setting depths, gas lift injection and production rates are input to WinGLUE™ (Appsmiths) software along with WellTracer™data to establish lift point, possible leaks from casing to tubing, and multi-point injection.

WellTracer – Why the Technology is Needed

Communication Casing / Tubing• Combination of wireline methods used in most cases to pin point source of communication, requires wellbore intervention

• WellTracer identifies source of communication without wellbore intervention

• No loss of Production or downtime from conventional troubleshooting tools

Cost of WellTracer™ survey is ~27% of conventional troubleshooting methods – not

counting production downtime.

Halliburton Wellstar SCSSSV @ +/- 1203-ft MD (ID=2.188”)

Long String: TK-7 IPC2-7/8”, 7.9-ppf, P-110 BTS-6 to 2596-ft MD2-7/8”, 6.5-ppf, P-110 BTS-8 to 14702-ft MD2-3/8”, 4.7-ppf, P-105 BTS-8 to 15906-ft MD

7-5/8”, 47.1 ppf, TOL @ +/-14834-ft MD / 13122-ft TVD

2-7/8” HWS nipple @ +/- 10020-ft MD (2.188” ID)

2-3/8” SWS nipple @ +/- 15703-ft MD (ID=1.875”)

GT dual packer @ +/- 15762-ft MD

4”, 11.6 ppf Blank Pipe 15948-16027-ft MD

SlimPak 140, .006 ga, screen 16027-16159-ft MD, 20/40 gravel pack sand

Sump packer @ +/- 16160-ft MD

Halliburton Crimson Vent Screen

PBTD (EZSV) @ +/- 16975-ft MD15262-ft TVD

SS 1 SCSSV 1171’ 2.188”SS 2 HWS 9963’ 2.188”SS 3 SWN 15744’ 1.791”

LS 1 SCSSV 1203’ 2.188”LS 2 SWS 10050’ 1.875”

FIELD LEASE WELLENGINEER INITIAL DATEWELL STATUSDRAWING STATUS Current Sketch DRAWING BY

ZERO

RKB-MWL

WD

KOP

MAX DEV

D&C

NIPPLES

# TYPE DEPTH ID

TUBING

CASINGS

WELL HEAD

OD GR WT DEPTH

STRODIDWTGRTHFRMTO

18-5/8” 991’13-3/8” 6504’9-7/8” P-110 62.8 15265’7-5/8” Q-125 47.1 16840’5” P-110 21.4 16980

South Timbalier Block 54 OCS-G 020 B-33/33DTony W. Hord

Lester Matthews, Jr.

DRAWING LEGEND

cement

open perforations

gravel pack sand

165’

65’

18-5/8” @ +/- 991-ft MD / 991-ft TVD

Halliburton Well star SCSSSV @ +/- 1170-ft MD (ID=2.188”)Short String: TK-7 IPC2-7/8”, 7.9-ppf, P-110 BTS-6 to 2594-ft MD2-7/8”, 6.5-ppf, P-110 BTS-8 to 14706-ft MD2-3/8”, 4.7-ppf, P-105 BTS-8 to 15750-ft MD

13-3/8” @ +/- 6504-ft MD / 5987-ft TVD

9-7/8” , 62.8 ppf @ +/- 15265-ft MD

2-7/8” HWS nipple @ +/- 9963-ft MD (ID = 2.188”)2-3/8” CMD Sliding Sleeve@ +/-15705-ft MD (ID=1.995”)

2-3/8” SWN nipple @ +/- 15774-ft MD (ID = 1.791”)GP packer @ +/- 15915-ft MD

H-1 perforations @ 16048-16146-ft MD / 14330-14428-ft TVD

5” TOL @ +/- 16520-ft / 14802-ft TVD

7-5/8” @ +/- 16840-ft / 15122-ft TVD

RA Tag @ +/- 16847-ft MD

H-4 perforations @ 16921-16958-ft MD / 15200-15245-ft TVD

5” Liner @ +/- 16980-ft MD / 15260-ft TVD

10.0

-ppg

CaC

l 2pa

cker

flui

d

GASLIFT MANDRELS

MDLong String

1690 Dummy3263 Dummy

4849 Press. Valve6282 Dummy7527 Dummy8742 Dummy9925 Dummy

#1 #2

July 21, 2008

36o

Gas Lift Valve Installation

GASLIFT MANDRELS

MD

Short String

1657 Press. Valve3199 Press. Valve4784 Press. Valve6218 Dummy7464 Dummy8680 Dummy9864 Dummy

1 DayWellTracer

6 DaysCaliper Survey

3 DaysHole Finder

3 DaysPony Tail

WellTracer™ – Why the Technology is Needed

Dual well operation is difficult to optimize with complex gas lift designs and common annulus

•Inability to control injection rate & pressure per string

•Producing various fluid gradients into the production system

•Valve type & setting are critical for a successful & efficient operation

Tools for well diagnostics

• WellTracer™ / WinGLUE™ software, identifies / validates gas lift through put rate per valve

• Echometer acoustic well sounding equipment / software & pressure transducers validate gas pressure per valve

• Clamp on gas meter is used to measure input gas lift rate to the well(s)

First industry wide dual WellTracer™ survey

• One string equipped with IPO and the other with PPO unloading valves.• Both wells showed loading tendencies May 2007• Unsuccessful at gas lifting both strings effectively through Sep 2008• May 2009 – RE, SSE, AL, Ops collected historical data to calibrate WinGLUE ™ model to determine

WellTracer predictions, predict survey time and coordinate offshore logistics.• June 2009 Gas Lift Team performed WellTracer™ on both strings

– GL Techs working with Operations set wells up for simultaneous tracer surveys – Surveyed - B33 day 1, B33D day 2, B33/B33D day 3 (2 WellTracer ™ analyzers used 3rd day)– WellTracer ™ surveys results reviewed by GL Techs, AppSmiths ™, and Gas Lift Consultant– WinGLUE ™ modeling estimated both wells capable of a combined rate of 292 BOPD– Recommendation made to decrease orifice valve from 10/64 to 8/64 in the B33 and increase

gas lift injection pressure (casing) by 30 psi• July 26, 2009 Field Operations installed recommendation• July 27-29, 2009 GLT unloaded wells and returned to production• August 3, 2009 both wells producing better than prediction at 317 BOPD combined rate with both

strings in stable flow.

ExxonMobil obtained two WellTracer™ analyzers in May 2009 and performed the first dual well survey at ST-54 B33 (Long string)/B33D(Short string)

First Industry Wide Dual WellTracer™ Survey

Well data was collected, using FPT, Well Tests and Echometer data. This information was input into WinGLUE ™ to create a PREDICTIVE MODEL prior to performing a WellTracer™ analysis.

Ver

tical

Dep

th (f

eet)

0

2000

4000

6000

8000

10000

12000

14000

16000

Pressure (psig)

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Depth vs Pressure Well: [GLUE] SOUTH TIMBERLIER,54,B33,SS 10-Jun-2009 13:10:47

Production Pressure Model: MMSM

Injection Pressure Model

Avg. Flowing Pressure Survey

Open / Closing Points (Open)

Open / Clos

Mandrel 1 (

First Industry Wide Dual WellTracer Survey

Con

cent

ratio

n (%

)4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

Time (hh:mm:ss)

0:00:00 1:06:40 2:13:20 3:20:00 4:26:40 5:33:20 6:40:00 7:46:40 8:53:20

Concentration Vs. Time Well: [GLUE] SOUTH TIMBERLIER,54,B33,LS 22-Jun-2009 12:00:20

Total Transit 1 (1690 MD - Dummy - Dummi


Total Transit 3 (4849 MD - Macco R-1D 5/





Raw CO2 Concentrations

Once “WellTracer” Analysis was performed, the actual data was matched with the predictive data and we were able to make a specific recommendation.

USP WellTracer ™ Survey Activities237 BOPD uplift achieved410 BOPD uplift identified

18 WellTracer™ surveys conducted to date– August 2008 – Weatherford performed survey at GI 16 W-31 Well

• Findings revealed leaking top mandrel, recommended replacing top valve, predicted possible 60 BOPD BU (100’ fill top of perfs)

– May 2009 – West Texas 6 Pegasus Gas Lift Wells• First surveys run with Company owned equipment• Recommendation follow up resulted in 72 BOPD BU• Potential 141 BOPD BU remaining if recommendations implemented and achieved

– June 2009 – ST 54 B33/B33D - 2 Wells / 4 surveys (First Dual Survey) 137 BOPD BU– July 2009 – GI 16 L-8, T-38ST, T-51, U-50 - 4 Wells

• Possible 210 BOPD BU remaining if recommendations implemented and achieved – July 2009 – Hoover/Dianna HA-5 attempted 2 WT surveys to identify surging issues

• Based on finding were able to recommend reducing gas injection rate by 1.5 MCFD and lowering gas injection pressure to 1474 psi (the operating pressure of 1585 psi was causing surging and multi-pointing

– August 2009 – Gal 209 B8D – Attempted to run survey on future TP&A well to determine possible communication but not able to establish injection rate

WellTracer Future Plans

GOM ~75 SI Wells (+40 duals)– Most duals (one string) SI since 2005 Hurricane Katrina– Couldn’t unload after being SI for repairs

GOM – Ongoing communication checks, Trouble shooting &optimization

Offshore California, SYU – Gas lift orifices may be oversized– WellTracer Surveys ~75 wells

Acquisition of Auxiliary Equipment– WellTracer Units, Transportation, Storage, Gas Bottles,

Self Contained Unit, RAMBO Computers, Wireless Transducers, Additional Training

Global Implementation for Gas Lift Optimization with an added fully equipped, traveling Gas Lift Optimization team.

– UK North Sea– Equatorial Guinea– Australia– Malaysia (large number of dual wells)– Nigeria (some dual wells)– Newfoundland

Current WellTracer ™ equipped team is comprised of two Field gas Lift Technicians, two Engineer technicians and one Analyst


Thanks!Use of referenced equipment and software in this presentation is with the permission of:

WellTracer™ is patented and distributed by Appsmiths ™, Houston, Texas, WinGLUE™ software is distributed by Appsmiths ™, Houston, Texas, www.appsmiths.com com

Echometer well sounding equipment and Echometer software are distributed by Echometer Company, Wichita Falls, Texas, www.echometer.com


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