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Remote Operation of Gas-lifted Wells

Remote Operation of Gas-lifted Wells. John Stewart. Shell Technology. Smart Electronic Gas Lift. Cable-less Downhole Monitoring and Flow Control for Remote Operation of Gas-lifted Wells:. Gasmer Prototype Laboratory The Conch Works. ~.

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Remote Operation of Gas-lifted Wells

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  1. Remote Operation of Gas-lifted Wells John Stewart Shell Technology

  2. Smart Electronic Gas Lift Cable-less Downhole Monitoring and Flow Control for Remote Operation of Gas-lifted Wells: Gasmer Prototype Laboratory The Conch Works

  3. ~ Downhole control of lift gas injection using Shell’s cable-less technology • Power and comms via tubing; current return via casing (Pseudo-wire). • Well head is isolated by means of electrical choke. • Liftgas injection sub contains: • Electrically operated gaslift valve • Casing and tubing pressure gauge • Gas flow meter. • Gaslift valve (SepTAR/Masterflo development): • Unloading valves are remotely controllable • Non-conducting centralisers

  4. Electrical Choke: Attenuation of power signal; Voltage difference across choke drives P&C module P&C module: electronics housing and gauges Electric gas lift valve: Masterflo miniature choke Check valve

  5. Valve body, including motor, gearbox and choke Gas inlet ports Check valve

  6. Electronics and sensor module Electrical Choke Electric gas lift valve

  7. Value aspectsofWirelessWell technology

  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.

  9. OTHER APPLICATIONS • GAS LIFT FROM DUAL COMPLETIONS • Optimise and monitor both strings individually. • Status: • Equipment design finalised. • Construction and testing awaiting release of funds.

  10. 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.

  11. Gas Flow & Bottom Hole Pressure vs Valve Position

  12. Middle Eastern Deployment 0 -20 80 180 280 380 480 580 680 780 880 -100 -200 Controlled unloading -300 and monitoring -400 Conventional gas lift mandrel -500 Controlled lift gas injection and monitoring 150 m deeper than conventional. -600 150m -700 TVD 7” shoe Open hole -800

  13. Wireless Power & Comms – Smart Wells 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

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