FE 02-15 Fishing

Nội dung text: FE 02-15 Fishing

1. Fishing • The technique of removing pieces or sections of drilling equipment left behind in the hole or stuck in the hole • 3 general situations that require a “fishing job”: – Drill string fatigue failures – Stuck pipe – Junk (foreign objects) in the hole
2. Stuck Pipe • Mechanical sticking • “Key seating” • Bridging • Differential sticking • Sloughing borehole • Junk in the hole
3. Fishing Tools Used to Recover Junk • “Junk” or “Boot” Sub • “Finger-type” or “Poor Boy” Junk Basket • Core-type Junk Basket • Fishing Magnet • Jet Bottomhole Cutter • Grapple or Rope Spear
4. “Finger-type” or “Poor Boy” Junk Basket
5. Fishing Magnet • Used to pick up steel fragments.
6. Grapple or Rope Spear • Used to retrieve wireline cable in the hole
7. Mill • Prepare the top and OD surface (dress) the top of a fish so that the selected fishing tool is able to make a firm positive catch
8. Wall-Hook Guide • Used if the top of the fish is located in a washed out section. • It takes the place of the regular guide on the bottom of an overshot. It will engage the fish and guide it into the overshot.
9. Washover • A large diameter pipe with a rotary cutting shoe on the bottom. • It is used to “drill over” stuck pipe to free it before fishing.
10. Free-Point Indicator and String Shot • An electronic instrument used to determine at what pointing the borehole is the fish stuck by sensing torque or pipe movement.
11. End of Topic