Method of protecting a permeable formation
Patent
·
OSTI ID:7090714
This patent describes a method of drilling a well bore through subsurface formations including a permeable formation. It comprises: drilling a well bore through the permeable formation to at least the lower boundary thereof; filling the bore in the permeable formation with liquid composition capable of gelling, the liquid composition containing a gel breaker; allowing the gel to mature; drilling through the gel so as to open the well bore in the permeable formation, some of the gel remaining to plug the permeable formation in the well bore; installing a casing in the well bore in the permeable formation; and allowing the remaining gel to revert to a liquid.
- Assignee:
- Marathon Oil Co., Findlay, OH (USA)
- Patent Number(s):
- A; US 4930575
- Application Number:
- PPN: US 7-331934A
- OSTI ID:
- 7090714
- Country of Publication:
- United States
- Language:
- English
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