Well cleaning tool
Patent
·
OSTI ID:5879647
A tool for cleaning scale and the like from the interior of well casings, liners and production tubing is described. It is comprised of an elongate vertically extending cylindrical body, with coupling means at the upper end of the body to connect with a fluid conducting run-in pipe string. A central longitudinal flow passage in the body communicates with the pipe string and opens downward. It has an enlarged, central, axially extending cylindrical chamber in the body between the upper and lower end portions of the flow passage and a number of circumferentially spaced ball-receiving openings in the body communicating between the exterior of the body and the chamber. An elongate axially shiftable mandrel is provided with a downward and radially inward convergent conical surface slidably engaged in the chamber and has a central longitudinal fluid conducting opening. A helical compression spring in the chamber above the mandrel engages normally, urging the mandrel downward. A ball rotatably and axially shiftable is arranged in each opening. An outer liner engages a portion projecting radially outward from the body and an inner portion projecting radially inward into the chamber and engaging the mandrel. 8 claims.
- Assignee:
- EDB-85-070782
- Patent Number(s):
- US 4332296
- OSTI ID:
- 5879647
- Country of Publication:
- United States
- Language:
- English
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