CN207660558U - A kind of reducing centralizer - Google Patents

Abstract

The utility model discloses a centralizer with a variable diameter, which comprises: a central pipe body; a plurality of centralizing strips arranged on the outer surface of the central pipe body evenly distributed along the circumference, and the centralizing strips include an upper connection section, a shaft wall contact section and a lower Connecting section, the upper end of the upper connecting section and the lower end of the lower connecting section are respectively hinged with the central pipe body, and the two ends of the well wall contacting section are respectively connected to the lower end of the upper connecting section and the upper end of the lower connecting section in one-to-one correspondence; The radial elastic distance adjustment device corresponding to the centralizing strip is connected between the shaft wall contact section and the outer surface of the center pipe. In the variable-diameter centralizer provided by the utility model, by setting the radial elastic distance adjustment device, and by means of the waist-shaped holes on the upper and lower connecting sections, the outer diameter can be changed to adapt to the actual well wall conditions, thereby improving the stability of the shaft. Applicability to different working conditions and stability of work.

Description

A variable diameter centralizer

technical field

The utility model relates to the field of centralizers, in particular to a diameter-variable centralizer.

Background technique

The use of casing centralizer is an effective measure to improve the cementing quality. The casing centralizer can effectively center the casing, effectively overcome the problem of cement slurry channeling, and can also reduce the risk of casing stuck due to pressure difference. Existing casing centralizers are generally rigid centralizers, which are generally used in regular wellbores with no shrinkage or no pot-bellied well sections. In irregular boreholes with reduced diameter or belly section, due to the variation of borehole diameter, no matter how many rigid centralizers are used, the casing cannot achieve the required centering degree.

Utility model content

Aiming at the above-mentioned problems existing in the existing centralizers, a variable-diameter centralizer is now provided, aiming at overcoming the technical deficiencies in the existing centralizers.

The specific technical scheme is as follows:

A variable-diameter centralizer has such features, including:

central body;

A plurality of centralizing strips are uniformly arranged on the outer surface of the central pipe body along the circumferential direction. The centralizing strips include an upper connecting section, a shaft wall contact section and a lower connecting section. The upper end of the upper connecting section and the lower end of the lower connecting section are respectively connected to the central pipe The two ends of the well wall contact section are respectively one-to-one corresponding to the lower end of the upper connection section and the upper end of the lower connection section;

A plurality of radial elastic distance adjustment devices corresponding to the centralizing strips are connected between the well wall contact section and the outer surface of the center pipe.

The above-mentioned variable diameter centralizer also has such a feature that the radial elastic distance adjustment device includes at least one radial spring, the inner end of the radial spring is connected to the central pipe body, and the outer end of the radial spring is connected to the well wall contact section .

The above-mentioned variable diameter centralizer also has such a feature that the radial elastic distance adjustment device also includes a radial spring stabilizing sleeve corresponding to the radial spring, and the radial spring stabilizing sleeve is correspondingly sleeved on the outside of the radial spring. Its inner end is connected to the central pipe body, and the length of the radial spring stabilization sleeve is less than that of the radial spring.

The above-mentioned variable diameter centralizer also has such a feature that the radial elastic distance adjustment device includes two radial springs, and is arranged at intervals along the axial direction of the central tubular body between the well wall contact section and the central tubular body .

The aforementioned variable-diameter centralizer also has the feature that at least two universal balls are installed on the outer surface of the well wall contact section, and the universal balls are arranged at intervals along the length direction of the well wall contact section.

The aforementioned variable-diameter centralizer also has such a feature that the upper connecting section and the lower connecting section are provided with waist-shaped holes, and the two ends of the shaft wall contact section are respectively connected in the waist-shaped holes through sliding rods.

The beneficial effect of said scheme is:

In the variable-diameter centralizer provided by the utility model, by setting the radial elastic distance adjustment device, and by means of the waist-shaped holes on the upper and lower connecting sections, the outer diameter can be changed to adapt to the actual well wall conditions, thereby improving the stability of the shaft. Applicability to different working conditions and stability of work. The variable-diameter centralizer provided by the utility model has the advantages of simple structure and practical functions.

Description of drawings

Fig. 1 is a schematic structural view of a variable-diameter centralizer provided in an embodiment of the present invention.

In the drawings: 1. Central pipe body; 2. Righting strip; 21. Upper connection section; 22. Well wall contact section; 23. Lower connection section; 3. Radial spring; 4. Radial spring stabilization sleeve; 5. Universal ball; 6, waist-shaped hole; 7, slide bar.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

The utility model will be further described below in conjunction with specific embodiments, but not as a limitation of the utility model.

Fig. 1 is a schematic structural view of a variable-diameter centralizer provided in an embodiment of the present invention. As shown in Figure 1, the variable-diameter centralizer provided in the embodiment of the present utility model includes: a central pipe body 1; 2 includes an upper connection section 21, a well wall contact section 22 and a lower connection section 23, the upper end of the upper connection section 21 and the lower end of the lower connection section 23 are respectively hinged with the central pipe body 1, and the upper connection section 21 and the lower connection section 23 Waist-shaped holes 6 are provided on the top, and the two ends of the well wall contact section 22 are respectively connected to the waist-shaped holes 6 by sliding rods 7. The two ends of the well wall contact section 22 correspond to the upper connection section 21 respectively. The lower end is rotatably connected to the upper end of the lower connecting section 23; a plurality of radial elastic distance adjustment devices corresponding to the centralizing strip 2 are connected between the well wall contacting section 22 and the outer surface of the central pipe.

In this embodiment, the radial elastic distance adjustment device is provided, and the sliding of the well wall contact section 22 in the upper connecting section 21 and the lower connecting section 23 is realized by means of the waist hole 6, so as to adjust the radial distance of the well wall contact section 22 , so as to realize the transformation of the outer diameter of the centralizer and adapt to the actual well wall conditions, thereby improving the applicability to different working conditions and working stability.

The design of the three-segment centralizer in this embodiment is compact and practical compared to the four-segment hinged structure, and fewer parts make the centralizer provided by this embodiment more stable and reliable.

Specifically, the radial elastic distance adjustment device in this embodiment is provided with a radial spring 3 and a radial spring stabilization sleeve 4, the inner end of the radial spring 3 is connected to the central pipe body 1, and its outer end is in contact with the well wall The sections 22 are connected, the radial spring stabilizing sleeve 4 is sleeved on the outside of the radial spring 3, and its inner end is connected to the central pipe body 1, and the length of the radial spring stabilizing sleeve 4 is less than the length of the radial spring 3. In the embodiment, by setting the radial spring 3, under the abutment of the radial spring 3, the well wall contact section 22 can be in close contact with the well wall, so as to perform the righting operation better; at the same time, in this embodiment, by optimizing the radial The length of the spring stabilizer 4 is to ensure that the radial spring 3 can also withstand the well wall contact section 22 when it is compressed to the shortest length, so as to meet the normal use requirements. In addition, the radial spring stabilizer 4 can also avoid When the radial spring 3 is working, it is dumped due to uneven force, which leads to the loss of contact with the contact section 22 of the well wall and loses its function. Axially spaced between the well wall contact section 22 and the central pipe body 1 .

In addition, in the variable-diameter centralizer provided in this embodiment, at least two universal balls 5 are installed on the outer surface of the well wall contact section 22, and the two universal balls 5 are arranged at intervals along the length direction of the well wall contact section 22. In the embodiment, the universal ball 5 is provided to reduce the frictional resistance along the axis of the borehole, and at the same time, the universal ball 5 can also play an auxiliary role in torque reduction.

The above are only preferred embodiments of the present utility model, and are not intended to limit the implementation and protection scope of the present utility model. For those skilled in the art, they should be able to realize that all equivalent replacements and The solutions obtained by obvious changes shall all be included in the protection scope of the present utility model.

Claims (5)

1. a kind of reducing centralizer, which is characterized in that including：

Center tubes (1)；

Multiple settings being evenly distributed are in the righting strip (2) of the lateral surface of the center tubes (1), righting strip (2) packet Include linkage section (21), borehole wall contact-segment (22) and lower linkage section (23), the upper end of the upper linkage section (21) and it is described under The lower end of linkage section (23) is hinged with the center tubes (1) respectively, and the both ends difference of the borehole wall contact-segment (22) is one by one It is corresponding to be rotatablely connected with the lower end of the upper linkage section (21) and the upper end of the lower linkage section (23)；

Multiple radial elastic roll-setting gears being correspondingly arranged with the righting strip (2), be connected to the borehole wall contact-segment (22) with Between the lateral surface of the central tube, kidney slot (6), institute are equipped on the upper linkage section (21) and the lower linkage section (23) The both ends for stating borehole wall contact-segment (22) are respectively rotationally connected with by slide bar (7) in the kidney slot (6).

2. reducing centralizer as described in claim 1, which is characterized in that the radial elastic roll-setting gear includes at least one The inner end of a radial spring (3), the radial spring (3) is connected in the center tubes (1), and outer end connects with the borehole wall Section (22) is touched to be connected.

3. reducing centralizer as claimed in claim 2, which is characterized in that the radial elastic roll-setting gear further includes and diameter To the corresponding radial spring stabilizer (4) of spring (3), the radial spring stabilizer (4) is set in the corresponding radial spring (3) outside, inner end are connected in the center tubes (1), and the length of the radial spring stabilizer (4) is less than described The length of radial spring (3).

4. reducing centralizer as claimed in claim 2, which is characterized in that the radial elastic roll-setting gear includes two diameters To spring (3), and along the axially-spaced setting of the center tubes (1) in the borehole wall contact-segment (22) and the center Between tube body (1).

5. reducing centralizer as described in claim 1, which is characterized in that the lateral surface of the borehole wall contact-segment (22) is installed There are at least two multi-directional balls (5), the multi-directional ball (5) to be arranged along the length direction interval of the borehole wall contact-segment (22).