CN2549168Y - Downhole fishing claw - Google Patents

Abstract

The utility model discloses an underground fishing claw, which consists of an upper joint and a fishing cylinder. The lower end of the fishing cylinder is connected, through a screw, with 2 to 4 fishing claws with thin walls, and the internal wall of the fishing claw is welded with a steel wire or a steel rib. The utility model has advantages of simple structure, easy producing, low cost, convenient operation and high success rate, etc.

Description

The down-hole bailer grab

The utility model relates to a kind of down-hole fishing tool.

The oil field enters the exploitation middle and later periods, oil, well maintenance underground work amount roll up, in aboveground job execution process, often run into smallclothes things such as well head screw, tong key, plug, stone to fall well and need and salvage, the smallclothes fishing junk instrument of use mainly contains at present: tiger mouth, is pawl, strong magnetic die etc.Tiger mouth, one pawl in that to salvage diameter big, when the Y type bump seat of smallclothes junk in irregular shape such as well impacting tube, packer expansion controlling ring-shaped insert, fishing success ratio is low, and strong magnetic die is at well depth below 2000 meters, demagnetization occurs owing to the trip time of fishing string is long, the salvaging effect is bad.

The purpose of this utility model is exactly the shortcoming that overcomes prior art, and a kind of down-hole bailer grab is provided.

The purpose of this utility model is achieved in that the down-hole bailer grab is made up of top connection, fishing socket, and the lower end screw thread of fishing socket is connected with 2-4 thin-walled bailer grab, is welded with steel wire or reinforcing bar on the inwall of thin-walled bailer grab.

The utlity model has simple in structure, handling ease, with low cost, easy to operate, fishing success ratio advantages of higher.

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

Fig. 1: down-hole bailer grab structural representation;

Among the figure: 1-top connection, 2-fishing socket, 3-bailer grab, 4-steel wire or reinforcing bar;

As shown in Figure 1, the down-hole bailer grab is made up of top connection 1, fishing socket 2, bailer grab 3, steel wire or reinforcing bar 4, the upper end screw thread of fishing socket 2 is connected to top connection 1, the lower end screw thread of fishing socket 2 is connected to thin-walled bailer grab 3, bailer grab can be made two pawls, three-jaw or four paws according to size, the shape of trouble of lost tool in hole, is welded with steel wire or reinforcing bar 4 on the inwall of bailer grab 3.

During use the top connection 1 of down-hole bailer grab is received the bottom of fishing string, after bailer grab 3 arrives top of fish, because of bailer grab 3 is a thin-walled, so be pressed under the situation of fishing tool arbitrarily radial deformation in the weight of fishing string, as smallclothes junk length during greater than the bailer grab internal diameter, bailer grab 3 can outwards be out of shape, and junk is entered; After the smallclothes junk entered bailer grab 3 the insides, steel wire that bailer grab is 3 li or reinforcing bar 4 tightly blocked junk, at this moment transferred whole fishing string loads, made thin-walled bailer grab 3 to internal diameter distortion or crooked, tripped out fishing string then, finished the salvaging purpose.

Claims (1)

1, a kind of down-hole bailer grab is made up of top connection (1), fishing socket (2), top connection (1) and fishing socket (2) are threaded, it is characterized in that: the lower end screw thread of fishing socket (2) is connected to 2-4 thin-walled bailer grab (3), is welded with steel wire or reinforcing bar (4) on the inwall of bailer grab (3).

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