Method for suspending wells
This patent describes a method for shutting in a well which minimizes damage to a formation. It comprises: placing into the formation a solution containing water and a chemical blowing agent; causing the chemical blowing agent to decompose thereby liberating a gas which forces formation fluids away from a wellbore into the formation; pumping a solidifiable gel mixture into the formation's productive interval via the wellbore while formation fluids are being forced away and precluded from the wellbore; causing the gel mixture to become a solid thereby forming a gel plug within the wellbore and a formation gel within the formation sufficient to withstand environmental formation conditions and pressures which cause hydrocarbonaceous fluids to flow into the wellbore from the formation areas near the wellbore; placing in the wellbore on top of the plug an amount of cement sufficient to isolate the productive interval when the cement hardens while being supported by the plug; and allowing the cement to set. The set cement in combination with the gel plug is competent to exclude production fluids from the wellbore.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4899819; A
- Application Number:
- PPN: US 7-253292A
- OSTI ID:
- 7128692
- Country of Publication:
- United States
- Language:
- English
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Method for suspending wells
Method for suspending wells