Supporting type casing centralizer

Abstract

The utility model relates to a supporting type casing centralizer. Comprising an outer cylinder, rigid centralizing strips, centralizing supporting strips and an inner cylinder, the rigid centralizing strips are in a spiral strip shape, the multiple rigid centralizing strips are annularly and evenly distributed on the outer circumference of the inner cylinder, the centralizing supporting strips are movably arranged between the adjacent rigid centralizing strips, the outer cylinder is fixedly arranged on the outer sides of the rigid centralizing strips, and the centralizing supporting strips are movably arranged between the rigid centralizing strips. Outer spiral grooves are formed among the rigid centralizing strips, the centralizing supporting strips and the outer barrel, inner spiral grooves are formed among the rigid centralizing strips, the centralizing supporting strips and the inner barrel, and the centralizing supporting strips are fixedly connected with the inner barrel. When the casing pipe is put down, the rigid centralizing strips play a role in centralizing the casing pipe, the outer spiral grooves between the rigid centralizing strips form rotational flow in the cement injection process, and finally cement can be filled in the outer spiral grooves and solidified, so that the casing pipe is supported, and the effect of resisting external extrusion force by the casing pipe is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of cementing tools, in particular to a supporting casing centralizer. Background Art

[0002] At present, the average depth of oil drilling is increasing, which brings huge external loads to the casing. Coupled with human factors, a large number of casings are deformed and damaged. To prevent excessive external squeeze from damaging the casing, the commonly used solution is to use extra thick-walled casing plus rigid centralizers, but the cost is high and the operation down the well is difficult. Therefore, in order to improve the above situation, it is necessary to propose a supporting casing centralizer to overcome the above technical problems. Utility Model Content

[0003] The purpose of the utility model is to provide a supporting casing centralizer in view of the above-mentioned defects in the prior art, thereby solving the problems of casing misalignment and large external squeezing force during the fixing process of casing in complex well conditions.

[0004] The technical solution is:

[0005] A supporting casing centralizer comprises an outer tube, a rigid centralizing bar, a centralizing support bar and an inner tube, wherein the rigid centralizing bar is in the shape of a spiral bar, a plurality of rigid centralizing bars are evenly distributed in an annular pattern on the outer circumference of the inner tube, centralizing support bars are movably arranged between adjacent rigid centralizing bars, the outer tube is fixedly arranged on the outer side of the rigid centralizing bar, an outer spiral groove is formed between the rigid centralizing bar, the centralizing support bar and the outer tube, an inner spiral groove is formed between the rigid centralizing bar, the centralizing support bar and the inner tube, and the centralizing support bar and the inner tube are fixedly connected.

[0006] Preferably, the inner spiral groove between the straightening support bar and the inner cylinder is coated with anti-corrosion and water-resistant adhesive.

[0007] Preferably, the straightening support bar and the inner tube are connected by welding.

[0008] Preferably, the number of the rigid straightening bars is .

[0009] Preferably, the rigid straightening bar comprises a straightening bar body, an inner straightening bar is arranged inside the straightening bar body, the diameter of the inner straightening bar is the same as the outer diameter of the inner tube, and an outer straightening bar is arranged outside the straightening bar body, the diameter of the outer straightening bar is the same as the inner diameter of the outer tube.

[0010] Preferably, the straightening support bar comprises a support bar body, the shape of the support bar body is a spiral bar, the thickness of the support bar body is less than the thickness of the rigid straightening bar, and a support bar inner ring is provided inside the straightening support bar body, and the diameter of the support bar inner ring is greater than the outer diameter of the inner tube.

[0011] The beneficial effects of the utility model are:

[0012] By adopting the casing centralizer of the above technical solution, when the casing is lowered, the rigid straightening bars play a role in straightening the casing, and the outer spiral grooves between the rigid straightening bars form a vortex in the outer spiral grooves during the cement injection process. Finally, the cement will fill the outer spiral grooves and solidify, playing a supporting role for the casing and enhancing the effect of the casing in resisting external extrusion force. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional diagram of the utility model;

[0014] Figure 2 It is a top view of the utility model;

[0015] Figure 3 It is the AA cross-sectional view of the utility model;

[0016] Figure 4 A three-dimensional image of a rigid straightening bar

[0017] Figure 5 A three-dimensional image of the straightening support bar

[0018] In the figure: 1, outer cylinder; 2, rigid straightening bar; 3, straightening support bar; 4, outer spiral groove; 5, inner cylinder; 6, inner spiral groove;

[0019] 21. The main body of the straightening bar; 22. The inner side of the straightening bar; 23. The outer side of the straightening bar; 31. The main body of the support bar; 32. The inner ring of the support bar. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0021] like Figures 1 to 5 As shown, a supporting casing straightener comprises an outer tube 1, a rigid straightening bar 2, a straightening support bar 3 and an inner tube 5, wherein the rigid straightening bar 2 is in the shape of a spiral bar, a plurality of rigid straightening bars 2 are evenly distributed in an annular manner on the outer circumference of the inner tube 5, and straightening support bars 3 are movably arranged between adjacent rigid straightening bars 2, the outer tube 1 is fixedly arranged on the outer side of the rigid straightening bar 2, an outer spiral groove 4 is formed between the rigid straightening bar 2, the straightening support bar 3 and the outer tube 1, an inner spiral groove 6 is formed between the rigid straightening bar 2, the straightening support bar 3 and the inner tube 5, and the straightening support bar 3 and the inner tube 5 are fixedly connected.

[0022] The inner spiral groove 6 between the straightening support bar 3 and the inner tube 5 is coated with anti-corrosion and water-resistant adhesive.

[0023] The straightening support bar 3 and the inner tube 5 are connected by welding.

[0024] The number of the rigid straightening bars 2 is 6.

[0025] The rigid straightening bar 2 comprises a straightening bar body 21, an inner straightening bar side 22 is provided inside the straightening bar body 21, and the diameter of the inner straightening bar side 22 is the same as the outer diameter of the inner tube 5; the outer straightening bar body 21 is provided with an outer straightening bar side 23, and the diameter of the outer straightening bar side 23 is the same as the inner diameter of the outer tube 1.

[0026] The straightening support bar 3 includes a support bar body 31, which is in the shape of a spiral bar. The thickness of the support bar body 31 is less than the thickness of the rigid straightening bar 2. A support bar inner ring 32 is provided inside the straightening support bar body 31, and the diameter of the support bar inner ring 32 is greater than the outer diameter of the inner tube 5.

[0027] The specification of the inner tube 5 is Φ127×5 mm, the specification of the outer tube 1 is Φ177.8×8 mm, and the specification of the straightening support bar 3 is Φ140×5 mm.

[0028] When working, the above-mentioned casing centralizer is installed at the designed position of the casing string. Before lowering the casing string, first match the size of the centralizing support bar 3 with the inner tube 5, use anti-corrosion and water-resistant adhesive to stick to the inner tube 5, or fix the two ends by welding, then put on the outer tube 1, and fix it to the rigid centralizing bar 2. When lowering the casing, the rigid centralizing bar 2 plays the role of centralizing the casing. During the cementing process, the outer spiral groove 4 between the rigid centralizing bars 2 forms a vortex in the outer spiral groove 4. Finally, the cement will fill the outer spiral groove 4 and solidify, which plays the role of supporting the casing and enhancing the effect of the casing to resist external extrusion force.

[0029] The above is only a preferred embodiment of the utility model. Any person skilled in the art may modify the utility model by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent transformation based on the technical solution of the utility model shall fall within the scope of protection claimed by the utility model.

Claims

1. A supporting casing centralizer, characterized in that: The invention comprises an outer cylinder (1), a rigid straightening bar (2), a straightening support bar (3) and an inner cylinder (5), wherein the rigid straightening bar (2) is in the shape of a spiral bar, a plurality of rigid straightening bars (2) are evenly distributed in an annular pattern on the outer circumference of the inner cylinder (5), and a straightening support bar (3) is movably arranged between adjacent rigid straightening bars (2), the outer cylinder (1) is fixedly arranged on the outer side of the rigid straightening bar (2), an outer spiral groove (4) is formed between the rigid straightening bar (2), the straightening support bar (3) and the outer cylinder (1), an inner spiral groove (6) is formed between the rigid straightening bar (2), the straightening support bar (3) and the inner cylinder (5), and the straightening support bar (3) and the inner cylinder (5) are fixedly connected.

2. A supporting casing centralizer according to claim 1, characterized in that: The inner spiral groove (6) between the centralizing support bar (3) and the inner cylinder (5) is coated with anti-corrosion and water-resistant adhesive.

3. A supporting casing centralizer according to claim 1, characterized in that: The straightening support bar (3) and the inner tube (5) are connected by welding.

4. A supporting casing centralizer according to claim 2, characterized in that: The number of the rigid straightening bars (2) is 6.

5. The supporting casing centralizer according to claim 2, characterized in that: The rigid straightening bar (2) comprises a straightening bar body (21), a straightening bar inner side (22) is provided inside the straightening bar body (21), the diameter of the straightening bar inner side (22) is the same as the outer diameter of the inner tube (5), and a straightening bar outer side (23) is provided outside the straightening bar body (21), the diameter of the straightening bar outer side (23) is the same as the inner diameter of the outer tube (1).

6. A supporting casing centralizer according to claim 5, characterized in that: The straightening support bar (3) comprises a support bar body (31), the support bar body (31) is in the shape of a spiral bar, the thickness of the support bar body (31) is less than the thickness of the rigid straightening bar (2), and a support bar inner ring (32) is provided inside the straightening support bar body (31), the diameter of the support bar inner ring (32) is greater than the outer diameter of the inner cylinder (5).

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