CN2575287Y - Polish rod anti-theft protective apparatus - Google Patents

Abstract

The utility model relates to a rotation type wear preventing device for a casing pipe, which is composed of a wear preventing sleeve, a main body, an upper blocking ring, a lower blocking ring, and a lower body. The utility model is characterized in that the upper blocking ring [3] is fixed with the main body [2] by a tooth quad; the wear preventing sleeve [1] is installed on the main body [2]; the lower blocking ring [4] is fixed with the lower body [5] through the tooth quad; the main body [2] and the lower body [5] are tightly fixed together through screw threads. The outer layer of the wear preventing sleeve [1] is processed by rubber or other wear resistant materials, and free rotation can be realized between the wear preventing sleeve [1] and the main body [2], and thereby, in the process of drilling trip or the rotation of a drilling column, the wear preventing sleeve which does not rotate along with the drilling column always contacts the inner wall of a casing pipe, the friction between steel is avoided, and the casing pipe is effectively protected.

Description

A kind of rotary type sleeve pipe shoe

Technical field:

The utility model belongs to the special device in oil, the Natural Gas Drilling Operation.

Technical background:

There is subordinate's defective in the sleeve pipe shoe at present: in normal wellbore construction, the sleeve pipe shoe is by being threaded in the drill string, because being the high-abrasive material of steel body and inwall sintering, the wearing bush in the present shoe that uses forms, the steel body contacts with internal surface of sleeve pipe, under perfect condition, the sleeve pipe wearing bush is non-rotary, but actual conditions are difficult to reach, often along with drill string rotates in sleeve pipe, and when round trip, shoe all directly contacts with sleeve pipe, thereby can not reach good abrasionproof effect.How can reach just that drill string rotates in sleeve pipe or the round trip process in do not grind sleeve pipe?

The utility model designs for addressing this problem just.It is made up of wearing bush [1], upper baffle ring [3], lower baffle ring [4], body [2] and lower body parts such as [5].Wearing bush [1] is fixed tightly on the body [2] by upper baffle ring [3], lower baffle ring [4] and lower body [5].When tripping operation, be connected in the drill string by body [2] box thread and lower body [5] male thread, because wearing bush [1] skin is that rubber or other high-abrasive material are made, so prevent casing wear, when drill string rotating, because wearing bush [1] is to rotate freely with body [2], wearing bush [1] did not change when body [2] rotated.The purpose of this utility model just provides the shoe of the suitable protective casing in a kind of scene.

Summary of the invention:

The utility model is achieved like this: upper baffle ring [3] is fixing by tooth embedding and body [2],

Wearing bush [1] is contained on the body [2], and lower baffle ring [4] is fixing by tooth embedding and lower body [5], and body [2] passes through screw threads for fastening together with lower body [5].Link together by body [2] upper end box thread and lower body [5] lower end male thread and drill string.

The utility model is making a trip and is creeping in the operation, because the rubber part of wearing bush contacts with internal surface of sleeve pipe all the time, thereby plays the effect of protective casing.Particularly for acting in the not positive well of the serious well of inclined shaft, dog-leg degree and well head, to sleeve pipe abrasionproof better effects if.

Description of drawings:

Fig. 1. a kind of rotary type sleeve pipe shoe

1. wearing bush 2. bodies 3. upper baffle rings 4. lower baffle rings 5. lower bodies

The specific embodiment:

Now the utility model will be further described in conjunction with Figure of description.

When employing the utility model carried out drillng operation, upper baffle ring [3] is fixing by tooth embedding and body [2], and wearing bush [1] was contained on the body [2], and lower baffle ring [4] is fixing by tooth embedding and lower body [5], and body [2] and lower body [5] are by screw threads for fastening together.Link together by body [2] upper end box thread and lower body [5] lower end male thread and drill string.

The utility model makes a trip or creeps in the operation in drilling well; because the rubber of wearing bush [1] or other high-abrasive material part contact with internal surface of sleeve pipe all the time; thereby the wearing and tearing of minimizing internal surface of sleeve pipe; protected sleeve pipe; prolong the life-span of oil well; particularly tilt, have in the not positive wellbore construction of dog-leg degree and well head for well, sleeve pipe abrasionproof effect is better.

Claims (3)

1, a kind of rotary type sleeve pipe shoe is made up of wearing bush, body, upper baffle ring, lower baffle ring and lower body, it is characterized in that upper baffle ring [3] is fixing by tooth embedding and body [2], wearing bush [1] is contained on the body [2], lower baffle ring [4] is fixing by tooth embedding and lower body [5], and body [2] passes through screw threads for fastening together with lower body [5].

2, a kind of rotary type sleeve pipe shoe according to claim 1 is characterized in that wearing bush [1] is the post hole, garden that the center that is made of a variety of materials is provided with the hole, and inside and outside layer processes for rubber or other high-abrasive material, and the centre is the steel skeleton.

3, a kind of rotary type sleeve pipe shoe according to claim 1 is characterized in that lower body [5] is that two ends are processed with screw thread, and the center is provided with the garden post reducing body of a through hole, has lock slots at butt end.