Flowback
After fracturing is complete, flowback begins. Flowback is used to clean up the wellbore and test the flow of the formation.
Workers reduce pressure at the wellhead and remove the isolation plugs using wireline, snubbing, or coiled tubing. Then, the well is allowed to flow back fluids, gas, and oil through flow lines into storage tanks or pits. This process helps remove excess fracturing fluid and brings hydrocarbons to the surface.
Flowback must be managed carefully due to the risks of high pressure and flammable materials.
Flowback Hazards
- exposure to high-pressure fluids and flow lines
- release of flammable gases or liquids
- fires or explosions from ignition sources
- struck-by hazards from equipment or hose failures
- exposure to hazardous vapors or hydrogen sulfide (H2S)
- noise exposure from flowing fluids and equipment
Flowback Controls and Solutions
- flow lines and tanks must be properly secured, bonded, and grounded
- pressure monitoring equipment must be used to detect abnormal conditions
- ignition sources must be controlled and hot work restrictions must be enforced
- workers must wear appropriate personal protective equipment
- gas detection and ventilation systems must be used where required
- only trained personnel must perform flowback-related tasks
Knowledge Check Choose the best answer for the question.
2-9. Why is flowback performed after the well is fractured?
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