ph0349-8 remote operation of gas-lifted wells shell technology john stewart
TRANSCRIPT
PH0349-8
Remote Operation ofGas-lifted Wells
Shell Technology
John Stewart
PH0349-8
Smart Electronic Gas Lift
Gasmer Prototype Laboratory
The Conch Works
Cable-less Downhole Monitoring and Flow Control for Remote Operation of Gas-lifted Wells:
PH0349-8
• Power and comms via tubing; current return via casing (Pseudo-wire).
• Well head is isolated by means of electrical choke.
• Lift gas injection sub contains:Electrically operated gas lift valveCasing and tubing pressure gaugeGas flow meter.
• Gas lift valve (SepTAR/Masterflo development):
• Unloading valves are remotely controllable
• Non-conducting centralisers
~
Downhole control of lift gas injection using Shell’s cable-less technology
PH0349-8
Electrical Choke: Attenuation of power signal;Voltage difference across choke drives P&C module
P&C module: electronics housingand gauges
Electric gas lift valve: Masterflominiature choke
Check valve
PH0349-8
Valve body, including motor, gearbox and choke
Gas inlet ports
Check valve
PH0349-8
Electrical Choke
Electric gas lift valve
Electronics andsensor module
PH0349-8
Value aspectsof
WirelessWell technology
PH0349-8
Value Aspects
– Remote monitoring and control.– On-line data availability allows instant well optimisation.
– Permanent downhole p&T gauges included.
– Possibility to automate process on field-wide basis.
– Lift point no longer restricted by wireline capabilities.
– Downhole control of lift gas injection.– Reduced lift gas surface infrastructure.
– Reduction in completion running time.– Modular design.– Cable-less: no cables and clamps to be installed.
– Dual Completions and Auto Gas Lift.
PH0349-8
OTHER APPLICATIONS
GAS LIFT FROM DUAL COMPLETIONS
Optimise and monitor both strings individually.
Status:
• Equipment design finalised.
• Construction and testing awaiting release of funds.
PH0349-8
OTHER APPLICATIONS
CABLE-LESS AUTO GAS LIFT
Use gas from gas cap or gas reservoir to lift oil.
• No surface gas lift facilities required.
• Significant cost savings on surface facilities.
• Full, real-time control.
• Ability to quickly respond to gas market demands by switching from oil to gas production.
PH0349-8
0
50
100
150
200
250
300
350
400
0 10 20 30 40 50 60 70 80 90 100
VALVE POSITION, % OPEN
PRES
SUR
E PS
IG
0
5
10
15
20
25
30
35
GA
S FL
OW
BOTTOM HOLE PRESSURE GAS FLOW kSCMD
Gas Flow & Bottom Hole Pressure vs Valve Position
PH0349-8
Middle Eastern Deployment
-800
-700
-600
-500
-400
-300
-200
-100
0
-20 80 180 280 380 480 580 680 780 880
7” shoe Open hole
150m
TVD
Controlled unloading
and monitoring
Controlled lift gas injection and monitoring
150 m deeper than conventional.
Conventional
gas lift mandrel
PH0349-8
E ffect o f G LV port s ize on stab ility
450
500
550
600
650
700
750
13:00 13:30 14:00 14:30 15:00 15:30 16:00 16:30
tim e
pres
sure
(psi
)
0
10
20
30
40
50
60
70
80
90
100
GLV
%op
en
P tub ing
P annulus
G L V %o p en
Wellbore as coaxial cable:
Tubing is center conductor & casing is ground return.
Electrical isolation Choke and insulating centralizers provide electrical separation.
Power is picked off using magnetic chokes (impedance).
Communication signals ride on power using digital multiplexed encoding.
Power available downhole to operate sophisticated electric gas lift valve.
Future work: Auto Lift, Dual String Common Annulus Gas Lift
Wireless Power & Comms – Smart Wells
PH0349-8