Restarting wells.pdf
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The document discusses restarting oil wells that have been shut in. It describes how reservoir pressure decreases when a well is shut in, causing fluids like gas and water to separate. It provides tips for successfully restarting production, such as opening the tubing slowly with a large choke to draw fluids out like from a shaken soda bottle. If the well does not restart, it presents alternative methods to try, like flashing, flowback, nitrogen lifting, using an electrical submersible pump, swabbing, or implementing a gas lift system using coiled tubing or packers. The goal is to safely remove fluids and restart fluid flow from the reservoir to the separators and flowlines.
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IEEE Aerospace and Electronic Systems Society as a Graduate Student Member
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Restarting wells.pdf
- 2. The basic problem of production 4000 psi 150 psi 3600 psi 300 psi 250 psi Getting fluids from reservoir to the separator. 1. From reservoir to bottom of wellbore (drawdown) 2. From bottom of wellbore to wellhead 3. Across choke 4. From choke across flowline to separator
- 3. The basic problem of production We create •Completion design •Choke •Flowline dimensions •Separator pressure From the reservoir •Reservoir pressure •Water cut •Oil chemistry (PVT)
- 4. What happens when a well is shut in? Pr Pwf Pr
- 5. What happens when the well is shut in? Initially filled with fluid Gas cap forms
- 6. What happens when the well is shut in? Initially filled with fluid And water settles out
- 7. In low pressure wells, tubing head pressure can be deceptive Early gas breakout Late gas breakout 3500 psi 3600 psi 3000 psi 1000 psi 2000 psi 500 psi
- 8. Slowly depressurising well won’t work
- 9. Open the well fast Draw out the fluid like in a shaken coke bottle
- 10. Velocity is important to unloading a well Larger pipe means lower velocity.
- 11. Annulus pressure can help
- 12. For a successful restart 1. Open tubing only. 2. Keep annulus closed. 3. Big choke. 4. Patience.
- 13. Concerns • Sanding • Hydrates • Joule-Thomson effect • Process stability
- 14. Things we can do When the well doesn’t restart…
- 15. Flashing Ingredients • Spare train and header Instructions • Depressurise spare train and header • Line up well to space train and header • Open well
- 16. Flowback Ingredients • Flow back package • Flare pit Instructions • Rig up flow back package to well • Open well to pit
- 17. Nitrogen lift
- 18. Nitrogen lift Ingredients • Coiled tubing • Nitrogen Instructions • Run in hole • Circulate the nitrogen
- 19. Electrical submersible pump Easy to make a well flow. Harder to operate. Pump Gas separator Motor
- 22. Swabbing Ingredients: • Slickline • Swab cap Instructions • Run in hole • Pull out of hole
- 23. Gas lift Packer Gas lift valve Gas lift gas injected into annulus
- 24. Gas lift