CN2752427Y

CN2752427Y - Small dimention high strength returnable fishing spears

Info

Publication number: CN2752427Y
Application number: CN 200420055130
Authority: CN
Inventors: 徐喜民
Original assignee: DENGFENG PETROLEUM ASSEMBLINGS FACTORY SAERTU DIST DAQING CITY
Current assignee: DENGFENG PETROLEUM ASSEMBLINGS FACTORY SAERTU DIST DAQING CITY
Priority date: 2004-12-29
Filing date: 2004-12-29
Publication date: 2006-01-18
Anticipated expiration: 2014-12-29

Abstract

The utility model relates to a small-diameter high-strength returnable fishing spear, which mainly solves the problems that a fish is clamped and can not be withdrawn when the existing fishing spear fishes an oil pipe particularly a fractured oil pipe in a position outside the coupling and a slip is easy to slip. The utility model is characterized in that the middle part of a spear rod (1) is provided with positive rotation spear teeth (2), and the outside of the spear rod is connected with a round slip (4) of which the outside is provided with positive rotation spear teeth (3) and the inside is provided with spear teeth meshed with spear teeth (2). The fish can be withdrawn in time once clamped and the slip is difficult to slip when the utility model fishes an oil pipe, particularly a fractured oil pipe in a position outside the coupling.

Description

Minor diameter high strength returnable fishing spear

Technical field:

The utility model relates to oil field oil recovery field well workover used fishing tool, particularly minor diameter high strength returnable fishing spear.

Background technology:

Along with the development in oil field, the long-term exploitation of oil well, the fracture of tubing string often appears in wearing out of downhole oil tubing string, at this moment just needs in time salvage reparation to the oil pipe that damages in well, guarantees the ordinary production of producing well.And the oil pipe that existing fishing spear is located to rupture beyond the box cupling to oil pipe in case fish is stuck when salvaging can't withdraw from, increased the difficulty of salvaging, can not be applied to salvage in the semidiameter cased well in 4 o'clock, and the easy slippage of slips when oil pipe is met card, activity duration is long, efficient is low, influences the ordinary production of producing well.

The utility model content:

Existing drag for that fish was stuck when oil pipe that lance locates to rupture beyond box cupling to oil pipe was salvaged can't withdraw from and the eely deficiency of slips in order to overcome, the utility model provides a kind of minor diameter high strength returnable fishing spear, in case fish is stuck when the tubing catch that oil pipe is located to rupture beyond the box cupling not only can in time withdraw from for this minor diameter high strength returnable fishing spear, and slips is difficult for slippage.

The technical solution of the utility model is: this minor diameter high strength returnable fishing spear comprises the lance bar, and there is forward spinning spear tooth at lance bar middle part, and its outer being connected with in addition has the round slips that is meshed with the lance tooth in the forward spinning spear tooth.

Above-mentioned lance tooth lower end is with and discharges ring.

The beneficial effect that the utlity model has is: this minor diameter high strength returnable fishing spear is owing to adopted such scheme, in case fish is stuck, in the time of need withdrawing from, as long as to the certain following power of hitting of lance bar, the inside and outside lance tooth of round slips and lance bar is thrown off, circle slips and lance bar produce and relatively move, withdraw from the purpose of dragging for lance thereby reach, and owing to simple to operately make the activity duration shorten, operating efficiency improves, and effectively reduces operating cost.

Description of drawings:

Accompanying drawing 1 is a structure sectional view of the present utility model.

1-lance bar among the figure, the 2-forward spinning spear tooth, the 3-forward spinning spear tooth, the round slips of 4-, 5-discharges ring.

The specific embodiment:

Below in conjunction with accompanying drawing will the utility model is described in further detail:

By shown in Figure 1, this minor diameter high strength returnable fishing spear comprises lance bar 1, and there is forward spinning spear tooth 2 at lance bar 1 middle part, its outer round slips 4 that is meshed, the circle slips 4 outer forward spinning spear tooths 3 that have have the lance tooth that is meshed with lance tooth 2 in the circle slips 4, and lance tooth 2 lower ends are with and discharge ring 5.

During actual the use, will justify slips 4 external diameters and be slightly larger than pipe aperture and drag in the lance lower going-into-well, when dragging for lance and enter the fish chamber, circle slips 4 is compressed, and produces certain outer expansion force, makes round slips 4 be adjacent to tube inner wall.Along with the up of lance bar 1 and the increase gradually that lifts power, the lance tooth 2 on lance bar 1 and the circle slips 4 intermeshes, and circle slips 4 produces radial loads, makes it bite the purpose that fish is realized salvaging.In case fish is stuck, in the time of need withdrawing from, as long as give lance bar 1 certain following power of hitting, the round slips 4 and the interior lance tooth 2 of lance bar 1 are thrown off, drilling tool 2-3 encloses reversing, circle slips 4 produces with lance bar 1 and relatively moves, impel round slips 4 to move downward along lance tooth 2, until circle slips 4 with discharge to encircle 5 upper surfaces and contact till, on carry drilling tool, can realize withdrawing from fish, reach the purpose that shortens the activity duration and improve operating efficiency.

Claims

1, a kind of minor diameter high strength returnable fishing spear comprises lance bar (1), it is characterized in that: there is forward spinning spear tooth (2) at lance bar (1) middle part, and its outer being connected with in addition has the round slips (4) that is meshed with lance tooth (2) in the forward spinning spear tooth (3).

2, according to the minor diameter high strength returnable fishing spear of claim 1, it is characterized in that: lance tooth (2) lower end is with and discharges ring (5).