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API 7-1 Fishing Tool Releasing and Circulating OvershotReleasing and circulating overshot is a tool for fishing from the outside of the pipe. It canfish drill collars, drill pipes, tubing, joints and
Releasing and circulating overshot is a tool for fishing from the outside of the pipe. It canfish drill collars, drill pipes, tubing, joints and other well-used pipes. The tool is equipped with a seal, which can circulate the drilling fluid under higher pump pressure after catching the fish. There are milling shoes on the lower part to trim the top of the fish. It can also be used with a jar to catch the stuck fish. If the catched fish cannot be released from stucking, we can withdraw the overshot and take out the drilling tool.
Overshot OD | Max. Catch Sizes | Connection | |
Spiral Grapple | Basket Grapple | ||
324 (12 3/4) | 282.6 (11 1/8) | 266.7 (10 1/2) | 6 5/8REG |
298 (11 3/4) | 257.2 (10 1/8) | 228.6 (9) | 6 5/8REG |
270 (10 5/8) | 228.6 (9) | 203.2 (8) | 6 5/8REG |
206 (8 1/8) | 177.8 (7) | 159 (6 1/4) | NC50 |
200 (7 7/8) | 171.5 (6 3/4) | 155.6 (6 1/8) | NC50 |
146 (5 3/4) | 117.5 (4 5/8) | 108 (4 1/4) | NC38 |
146 (5 5/8) | 120.7 (4 3/4) | 108 (4 1/4) | NC38 |
102 (4) | 77.8 (3 1/16) | 65 (2 9/16) | NC26 |
