Well casing cleaning assembly
This patent describes a well casing cleaning assembly. It comprises: cylindrical mandrel including a plurality of diametric drillings extending across the drillings being aligned at incremental azimuth displacements relative each other to form a spiral alignment; a corresponding plurality of knife blade assemblies received in the drillings. Each of the knife blade assembly including a coiled spring and a first and second knife blade extending from a base cap at one end thereof. The base case abutting the ends of the coiled spring; a plurality of arcuate plate segments engageable to the exterior of the mandrel the arcuate plate segments including slots formed therein in alignment over the drillings for receiving corresponding ones of the knife blades therethrough; and an upper and a lower packing attached to the ends of the mandrel and conformed for receipt in the well casing.
- Assignee:
- NOV; NOV-90-006283; EDB-90-075387
- Patent Number(s):
- US 4892145; A
- Application Number:
- PPN: US 7-348905A
- OSTI ID:
- 6916028
- Resource Relation:
- Patent File Date: 8 May 1989
- Country of Publication:
- United States
- Language:
- English
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