CN205876216U - Screw rod is roll alloy centralizer for drilling tool - Google Patents

Abstract

The utility model relates to the technical field of oil drilling and cementing, in particular to a rolling alloy centralizer for a screw drilling tool, which comprises a centralizer body, a centralizer alloy cover, a spherical alloy and a fixing bolt; In the positioning groove of the centralizer body, the ball hole on the alloy cover of the centralizer is aligned with the spherical alloy, put it on the centralizer body, and the fixing bolt is put into the fixing hole of the spherical alloy cover to connect with the centralizer body fixed. The utility model has the advantages of simple structure, easy processing and assembly, convenient replacement of accessories, long service life and low production cost. The spherical alloy in the rolling alloy centralizer prevents the alloy from breaking due to excessive heating on one side of the columnar alloy, which will cause the centralizer to lose its centralizing function.

Description

Rolling alloy centralizer for screw drilling tools

technical field

The utility model relates to the technical field of petroleum drilling and well cementing, in particular to a rolling alloy centralizer for a screw drilling tool.

Background technique

At present, for the screw drilling tools used in oil and gas drilling engineering, in order to keep the actual trajectory of the screw consistent with the design trajectory and maintain the stability of the screw in the well during the drilling process, the straight casing of the screw drive shaft is replaced with a Centralizer housing with centralizing belt. Generally, the shell of the centralizer is drilled on the centralizing belt according to a certain layout, and then the alloy block is placed on the hole, and pressed into the hole with a press in the form of interference fit, and the alloy surface protrudes from the centralizing belt by 1~2mm . However, during the drilling process, one side of the centralizing zone rubs against the well wall during directional drilling, causing the alloy to heat quickly. If the downhole situation is complicated, the sliding friction force will further increase, the alloy will heat faster, and the alloy will break and fail. In some cases, the size of the centralizing zone decreases little by little during the drilling process, and finally loses its centralizing effect, which affects the drilling progress.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the above-mentioned technologies, and provide a rolling alloy centralizer for a screw drilling tool, which increases the service life of the alloy and reduces the frictional resistance with the well wall.

In order to achieve the above object, the utility model adopts the following technical solutions:

A rolling alloy centralizer for a screw drilling tool, characterized in that it includes a centralizer body, a centralizer alloy cover, a spherical alloy and a fixing bolt; the spherical alloy is sequentially put into the positioning groove of the centralizer body, The ball holes on the alloy cover of the centralizer are aligned with the spherical alloy, and put into the centralizer body, and the fixing bolts are put into the fixing holes of the spherical alloy cover to be fixed with the centralizer body.

Preferably, lubricating grease is applied to the positioning grooves of the centralizer body.

The beneficial effects of the utility model are: compared with the prior art, the utility model has a simple structure, is easy to process, assemble and replace parts, has a long service life and low production cost. The spherical alloy in the rolling alloy centralizer prevents the alloy from breaking due to excessive heating on one side of the columnar alloy, which will cause the centralizer to lose its centralizing function. The service life of the centralizer is greatly improved; in the process of lifting or lowering, the sliding friction in the past is changed to rolling friction, and the frictional resistance is greatly reduced, so that the damage of the screw to the well wall is reduced, and the probability of downhole accidents is greatly reduced; If the spherical alloy is accidentally broken, you only need to open the cover to replace it and there is no site restriction. It can be replaced on site, saving time and effort, and avoiding delays in the construction period due to long-distance replacement parts.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the sectional view of A-A direction in Fig. 1;

Fig. 3 is a view from direction F in Fig. 1 .

detailed description

The specific implementation of the utility model will be described in detail below in conjunction with the accompanying drawings and preferred embodiments. As shown in Figure 1, a rolling alloy centralizer for screw drilling tools includes a centralizer body 1, a centralizer alloy cover 2, a spherical alloy 3 and a fixing bolt 4; the spherical alloy is put into the centralizer in turn In the positioning groove of the main body, grease is applied to the positioning groove of the centralizer body. The ball holes on the alloy cover of the centralizer are aligned with the spherical alloy, and put into the centralizer body, and the fixing bolts are put into the fixing holes of the spherical alloy cover to be fixed with the centralizer body.

The utility model has the advantages of simple structure, easy processing and assembly, convenient replacement of accessories, long service life and low production cost. The spherical alloy in the rolling alloy centralizer avoids the alloy fragmentation caused by the rapid heating of one side of the columnar alloy, which causes the centralizer to lose its centralizing function. The service life of the centralizer is greatly improved; in the process of lifting or lowering, the sliding friction in the past is changed to rolling friction, and the frictional resistance is greatly reduced, so that the damage of the screw to the well wall is reduced, and the probability of downhole accidents is greatly reduced; If the spherical alloy is accidentally broken, you only need to open the cover to replace it and there is no site restriction. It can be replaced on site, saving time and effort, and avoiding delays in the construction period due to long-distance replacement parts.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the scope of protection of the present utility model.

Claims (2)

1. a helicoid hydraulic motor is with rolling alloy centralizer, it is characterised in that: include centralizer body, centralizer alloy covers, ball Type alloy and fixing bolt；Described ball-type alloy is sequentially placed in the locating slot of described centralizer body, and described centralizer closes The ball alignment ball-type alloy that gold covers, puts on centralizer body, and the fixing hole of ball-type alloy covers put into by described fixing bolt In fix with centralizer body.

Helicoid hydraulic motor the most according to claim 1 rolls alloy centralizer, it is characterised in that: described centralizer body Locating slot is smeared grease.