CN2575289Y - Multifunction follow-up centring pumping well head sealing apparatus - Google Patents

Abstract

The utility model discloses an anti-theft device of a polished rod. The utility model is composed of a telescopic pipe section and a steel plate net, wherein, the telescopic pipe section which is formed by the sleeve joint of pipes of different dimension can be compressed and stretched, the upper end of the telescopic pipe section which is sheathed on a polished rod is fixed on a rope hanging device, the lower end of the telescopic pipe section is fixed on a wellhead large spool, and the steel plate net is installed at a peripheral part above a wellhead. The utility model has the advantages of simple structure, good anti-theft effect, extended service life of the polished rod, production cost saving, etc.

Description

A kind of polished rod anti-theft device

The utility model relates to a kind of polished rod anti-theft device, belongs to the production wellhead accessory.

The rod-pumped well polished rod adopts anti-chopper sheet to carry out antitheft usually at present, this anti-theft device belongs to the anti-theft measure of renovating again after the destruction, be the rod-pumped well polished rod suffer the lawless person chop wound damage after, it is flat to utilize the hardness of antitheft blade that the burr on the polished rod is frustrated, because lawless person's destruction repeatedly, polished rod is after flat through frustrating repeatedly of blade, the polished rod diameter diminishes, it is frequent to cause changing polished rod, and rate reduced when oil well drove a well, and had increased cost of production.

The purpose of this utility model just provides a kind of polished rod anti-theft device, and it can effectively prevent lawless person's pilferage.

The purpose of this utility model is achieved in that the polished rod anti-theft device is made up of expansion piece, expanded metal lath, expansion piece is connected together by the tubing of different size, can compress and stretch, expansion piece is enclosed within on the polished rod, the upper end of expansion piece is fixed on the polished rod eye, the lower end is fixed on the well head big four, and expanded metal lath is installed in the above periphery of well head.

The utlity model has simple in structure, good anti-theft effect, prolonged polished rod application life, advantage such as save production cost.

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

Fig. 1: the utility model structural representation;

As shown in Figure 1; the polished rod anti-theft device is made up of expansion piece 2, expanded metal lath 3; expansion piece 2 is connected together by the tubing of different size, can compress and stretch, and expansion piece 2 is enclosed within on the polished rod 1; the upper end of expansion piece 2 is fixed on the polished rod eye; the lower end is fixed on the well head big four, and expansion piece 2 gets up polished rod 1 integrally closed, and the periphery more than well head is provided with expanded metal lath 3; prevent that the lawless person from pounding expansion piece 2, play double protection.

Claims (1)

1, a kind of polished rod anti-theft device, it is characterized in that: it is made up of expansion piece (2), expanded metal lath (3), expansion piece (2) is connected together by the tubing of different size, can compress and stretch, expansion piece (2) is enclosed within on the polished rod (1), the upper end of expansion piece (2) is fixed on the polished rod eye, and the lower end is fixed on the well head big four, and expanded metal lath (3) is installed in the above periphery of well head.

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