Safety Alert
Safety Alert 165 - Shallow Gas Flows While Cementing Surface Casing
Safety Alert 165 - Shallow Gas Flows While Cementing Surface Casing
- BSEE
- Safety Alert
- BSEE Safety Alert 165
- Hydrocarbon ReleaseProcess Safety
- Hydrocarbon releaseWell controlWell integrity
- Drilling
- Upstream oil and gas
Summary
This alert examines four shallow-gas incidents following surface-casing cementing, attributed to formation-fluid migration before cement developed compressive strength. It discusses diverter removal, annular flow and well-killing methods, and considers cement properties, location selection, back pressure and shut-in options. Laboratory testing is suggested as a better basis for determining cement waiting time.
Classifications: Hydrocarbon release; hydrocarbon leak; oil and gas release.
Classifications: Well control; kick control; loss of well control.
Classifications: Well integrity; well life cycle integrity.
Classifications: Drilling; well drilling.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
BSEE Safety Alert 165. Themes: hydrocarbon release, process safety.