Downhole activated process and apparatus for centralizing pipe in a wellbore
An apparatus is described for spacing a pipe from the walls of a wellbore, the apparatus comprising: a plurality of openings in the wall of said pipe; receiving means provided in said openings, said receiving means being generally within the maximum exterior profile of the pipe and substantially flush with an interior bore within said pipe; a plurality of pistons for being mounted in said receiving means in the peripheral wall of the pipe and arranged on all sides of the pipe for outward extensible movement from a retracted position to an extended position to contact the wall of the wellbore and move the pipe away therefrom to thereby center the pipe in the wellbore; means for deploying said pistons from a retracted position to an extended position wherein said pistons project outwardly from the openings to contact the wall of the wellbore, said deploying means and pistons being arranged such that during deploying means and pistons being arranged such that during deployment said pistons may move the pipe away from the wall of the wellbore under the force of said deploying means; and means for securing said pistons in said extended position to hold the pipe away from the wall of the wellbore. A method is also described for installing a pipe in a wellbore traversing earth formations once it has been positioned.
- Assignee:
- Conoco Inc., Ponca City, OK (United States)
- Patent Number(s):
- US 5228518; A
- Application Number:
- PPN: US 7-761210
- OSTI ID:
- 6195422
- Resource Relation:
- Patent File Date: 16 Sep 1991
- Country of Publication:
- United States
- Language:
- English
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