Apparatus for cutting a notch in a subsurface formation
Patent
·
OSTI ID:6608324
An apparatus for cutting notch in a subsurface formation, for the initiation of a fracture hydraulically cuts a notch in a casing of a well. After the notch has been cut in the casing, a hydraulic cutting fluid is discharged from a nozzle through the opening in the casing to cut the desired notch in the formation. The width of the notch opening cut in the casing is at least 4 times the diameter of the nozzle opening. In one application the casing is cut by a high velocity stream discharged from one set of nozzles and thereafter second stage nozzles located at the midpoint of the opening are made operative and a notch is cut in the formation by a high velocity stream discharged through the second set of nozzles.
- Assignee:
- Gulf Research and Development Co.
- Patent Number(s):
- US 3254720
- OSTI ID:
- 6608324
- Country of Publication:
- United States
- Language:
- English
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