Fishing spear jointly cooperating with inner and outer slips

Abstract

The invention discloses a fishing spear jointly cooperating with inner and outer slips. The fishing spear comprises a core shaft, wherein an outer slip is mounted on the core shaft in a sliding mode,an upper fixing hole is formed inside the upper end of the outer slip, a second compression spring is placed in the upper fixing hole, internal threads are formed at the upper end of the upper fixinghole, a machine head is mounted on the upper fixing hole through threads, a lower clamping cavity is formed inside the lower end of the outer slip, inner sawtooth-shaped threads are formed in the sidewall of the lower clamping cavity, a first expansion groove is formed in the outer wall of the lower end of the outer slip, and a first compression spring is nested in the middle of the core shaft. The fishing spear has the beneficial effects that the inner and outer sides of a fallen drilling tool can be clamped at the same time through the combined action of the inner slip and the outer slip, the fixation degree of the fallen drilling tool is improved, and the phenomenon that fallen drilling tool falls off during fishing is avoided; two springs are mounted inside the fishing spear, and an acting force can be provided when the springs are compressed to promote the inner slip to be quickly fixed into the fallen drilling tool, so that the damage phenomenon of a guide cone or the fallen drilling tool is avoided, and the fixing efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of drilling and fishing equipment, in particular to a fishing spear with internal and external slips cooperating. Background technique [0002] During the oil drilling process, it is necessary to check the wellbore trajectory data. Usually, downhole multi-point instruments are used to measure data such as well deviation and azimuth. The operator puts the electronic multi-point instrument into the water hole in the drill string, and the instrument goes down to the special non-magnetic drill collar. After the measurement, use the drilling rig as power and use the wellhead equipment to pull out the drill string. When the instrument is 10 to 30 meters away from the surface outlet of the drilling platform, it is necessary to lower the special instrument to salvage the spear. To retrieve the instrument, the operator puts the spear from the wellhead platform into the water hole of the drill string for multi-point i...

AI Technical Summary

Problems solved by technology

[0003] When the existing fishing spear is used, the fish can only be fixed from the inside, and the fixation is not firm. When it is lifted out of the drilling, because the fish will contact the drilling wall, there is a certain probability of It will cause the fish to fall off the fishing spear, causing great economic loss

Images