High pressure well perforation cleaning
This patent describes an apparatus for jet washing perforation tunnels in a well casing or liner positioned in a well and perforation tunnels in an adjacent geologic formation. It comprises a tubing means forming a well flow path from the earth's surface to a location adjacent to the well liner positioned in the well; conduit means connecting a source of high pressure liquid to the tubing means, jet tool means having at least one hole in the wall thereof for jetting the high pressure liquid at the perforation tunnels in the well casing or liner, the jet tool means comprising a tubular member connected to the lower end of the tubing means; a jet seat member fixedly connected to the tubular member, the jet seat member having a central opening aligned with the hole and a jet body having a central opening at least 3/23 inch in diameter formed therein hydraulically sealed in the jet seat member, whereby the jet body may be rotated to provide axial movement of the jet body with respect to the jet seat member; and a source of high pressure liquid able to provide a hydraulic horsepower for supplying liquid at a flow rate of at least 0.77 barrels per minute per jet body used at pressures in excess of 5,000 psi, to wash the perforated tunnel to a standoff distance of at least 12 times the diameter of the central opening of the jet body.
- Assignee:
- Chevron Research and Technology Co., San Francisco, CA (United States)
- Patent Number(s):
- US 5060725; A
- Application Number:
- PPN: US 7-454107
- OSTI ID:
- 5434615
- Resource Relation:
- Patent File Date: 20 Dec 1989
- Country of Publication:
- United States
- Language:
- English
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