Halogen well accident prevention device

Abstract

The utility model discloses a brine well accident prevention device, which relates to the technical field of brine wells and comprises a sleeve body, and a buffer sleeve is arranged on the outer side of the sleeve body. A plurality of hard plates are arranged on the outer side of the buffering sleeve, and a plurality of parallel connecting plates are obliquely connected between the hard plates and the sleeve body. The connecting plate penetrates through the buffer sleeve; radial deformation buffering can be jointly provided by means of the elasticity of the buffering sleeve and the elasticity of the inclined connecting plate, external deformation is adapted, the sleeve body is protected, and well marinating accidents are prevented; and the hard plate can be stably connected with external cement, so that the connection strength and stability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of brine wells, in particular to a brine well accident prevention device. Background Art

[0002] Significant salt layer creep in brine wells can lead to casing collapse accidents. Salt layer creep refers to the phenomenon that the deformation of salt rock increases over time when subjected to external forces. This phenomenon is of great significance in engineering practice because it is directly related to the stability of the rock mass and the safety of buildings. The creep characteristics of salt rock not only affect the cementing quality during drilling and cementing, but may also cause plastic deformation or even damage to the casing, especially in salt rock layers in areas such as the Zhongyuan Oilfield. Since the thickness of the salt rock layer reaches 50 to 200 meters, the creep phenomenon is more significant.

[0003] In order to prevent brine well accidents, on the one hand, it is necessary to improve the strength of the casing, and on the other hand, to absorb the external force generated by the creep of the salt layer through external buffering. The utility model patent with publication number CN206458331U places a combined casing for casing deformation during shale gas well fracturing. It can be integrated with the external cement through high-strength fibers to form a high-strength tensile casing protective layer, but it is difficult to provide a buffering effect; the invention patent cementing system and casing joint with publication number CN110500043B has a rubber buffer sleeve, and the elastic modulus of the buffer sleeve is smaller than the elastic modulus of the outer cement ring, which can provide radial deformation buffering, but the buffering effect needs to be improved by relying solely on the elastic buffering of the rubber buffer sleeve material; and the insertion of a protrusion on the outside of the buffer sleeve to increase the connection strength with the cement ring only increases the connection area, because the inserted protrusion is elastic, resulting in low connection strength. Utility Model Content

[0004] The purpose of the utility model is to provide a brine well accident prevention device in order to solve the above-mentioned problems in the prior art.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A brine well accident prevention device comprises a casing body, a buffer sleeve is arranged outside the casing body; a plurality of hard plates are arranged outside the buffer sleeve, a plurality of parallel connecting plates are obliquely connected between the hard plates and the casing body; the connecting plates pass through the buffer sleeve.

[0007] Furthermore, the first end of the sleeve body is provided with an internal thread section, and the second end of the sleeve body is provided with an external thread section.

[0008] Furthermore, the buffer sleeve is made of rubber, and one end of the buffer sleeve extends to the first end surface of the sleeve body.

[0009] Furthermore, the hard plates include a plurality of groups arranged along the axial direction of the sleeve body, and each group is evenly distributed around the outer side of the buffer sleeve.

[0010] Furthermore, a plurality of extension rods are connected to the outer side of the hard plate.

[0011] Furthermore, a cylindrical mesh body is provided on the outside of the buffer sleeve, and the mesh body is connected to the end of the extension rod.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] The utility model can provide radial deformation buffering by relying on the elasticity of the buffer sleeve itself and the elasticity of the inclined connecting plate, adapt to external deformation, protect the casing body, and prevent brine well accidents; the hard plate can be stably connected with the external cement to improve the connection strength and stability;

[0014] The threaded connection structure adopted by the utility model enables the buffer sleeve to extend to the outside of the internal thread section, providing a buffer for the casing connection joint;

[0015] The utility model further improves the connection strength and stability through the extension rods and the mesh body which can be extended into the external cement body, and the strength of the external pouring cement can be improved through the mesh body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 This is a schematic diagram of the utility model with the buffer sleeve and the net body removed.

[0018] Figure 3 It is a schematic diagram of the buffer sleeve of the utility model.

[0019] Figure 4 This is a schematic diagram of the hard board and its connection structure of the utility model.

[0020] Figure 5 It is a schematic diagram of the net body of the utility model.

[0021] In the figure: 1. casing body; 2. internal thread section; 3. external thread section; 4. buffer sleeve; 5. hard plate; 6. connecting plate; 7. extension rod; 8. mesh body. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] The present invention is further described in detail below in conjunction with the embodiments.

[0026] Specific embodiments of the brine well accident prevention device provided by the utility model:

[0027] See also Figure 1-5 The brine well accident prevention device comprises a casing body 1, the casing body 1 is made of high-strength carbon steel, an internal thread section 2 is provided at the first end of the casing body 1, and an external thread section 3 is provided at the second end of the casing body 1. The external thread section 3 is adapted to the internal thread section 2, so that multiple casing bodies 1 can be connected end to end.

[0028] A buffer sleeve 4 is provided on the outside of the sleeve body 1; the buffer sleeve 4 is made of vulcanized anti-corrosion rubber, and one end of the buffer sleeve 4 extends to the first end face of the sleeve body 1, that is, the outside of the internal threaded section 2 is provided with a buffer sleeve 4, so that the buffer sleeve 4 can protect the connection joint of the sleeve body 1. Compared with the existing technology, the buffer protection is more comprehensive, and the deformation and damage at the connection joint can be reduced.

[0029] A plurality of hard plates 5 are provided on the outside of the buffer sleeve 4, and the hard plates 5 are parallel to the axial direction of the sleeve body 1. A plurality of parallel connecting plates 6 are obliquely connected between the hard plates 5 and the sleeve body 1; the connecting plates 6 pass through the buffer sleeve 4; in this embodiment, the hard plates 5 are rectangular steel plates, and the connecting plates 6 are steel plates that can undergo elastic deformation and bending; in some other embodiments, reinforcing ribs are welded at the connection between the connecting plates 6 and the hard plates 5, and at the connection between the connecting plates 6 and the sleeve body 1 for connection reinforcement, so that the connecting plates 6 are deformed first rather than broken at the ends.

[0030] When the external radial force acts on the outside of the hard plate 5 and applies a radial force toward the center of the casing body 1, the hard plate 5 acts on the outside of the buffer sleeve 4, and the buffer sleeve 4 can undergo elastic deformation to provide buffering; since the connecting plate 6 is in a parallel inclined state, the connecting plate 6 can also undergo elastic bending deformation to provide buffering, so as to reduce the direct effect on the internal casing body 1, better protect the casing body 1, and prevent brine well accidents.

[0031] The hard plates 5 include several groups arranged along the axial direction of the casing body 1, and each group is evenly distributed around the outside of the buffer sleeve 4; the projections of the ends of the adjacent groups of hard plates 5 on the center line of the casing body 1 overlap; the adjacent groups of hard plates 5 are staggered around the circumference, which can fully surround the outer side of the casing body 1, thereby fully protecting the casing body 1. The structure of multiple hard plates 5 forms multiple independent elastic buffer protections to reduce mutual interference among the various places.

[0032] A plurality of extension rods 7 are connected to the outside of the hard plate 5. The extension rods 7 are made of steel, and the ends of the extension rods 7 are bent into a hook shape. A cylindrical mesh 8 is provided on the outside of the buffer sleeve 4. There is a gap between the mesh 8 and the outer circumference of the buffer sleeve 4. The mesh 8 is connected to the ends of the extension rods 7. The mesh 8 can be made of a steel mesh, which is tied or welded to the ends of the extension rods 7. The mesh 8 can also be made of high-strength fiber, such as spandex fiber, and is hung on the ends of the extension rods 7.

[0033] During construction, multiple casing bodies 1 are connected end to end through threads and placed vertically in the center of the well. Cement slurry is poured between the outer side and the well wall. The cement slurry solidifies into a cement ring, which can be stably connected to the hard plate 5 outside the buffer sleeve 4. The extension rod 7 and the mesh body 8 extend into the cement ring to improve the strength of the cement ring, thereby forming a good peripheral protection.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A brine well accident prevention device, comprising a casing body (1), wherein a buffer sleeve (4) is provided on the outer side of the casing body (1); the device is characterized in that: A plurality of hard plates (5) are arranged on the outside of the buffer sleeve (4), and a plurality of mutually parallel connecting plates (6) are obliquely connected between the hard plates (5) and the sleeve body (1); the connecting plates (6) pass through the buffer sleeve (4).

2. The brine well accident prevention device according to claim 1, characterized in that: The first end of the sleeve body (1) is provided with an internal thread section (2), and the second end of the sleeve body (1) is provided with an external thread section (3).

3. The brine well accident prevention device according to claim 2, characterized in that: The buffer sleeve (4) is made of rubber, and one end of the buffer sleeve (4) extends to the first end surface of the sleeve body (1).

4. The brine well accident prevention device according to claim 1, characterized in that: The hard plates (5) include a plurality of groups arranged axially along the sleeve body (1), and each group is evenly distributed around the outside of the buffer sleeve (4).

5. The brine well accident prevention device according to claim 1, characterized in that: A plurality of extension rods (7) are connected to the outer side of the hard plate (5).

6. The brine well accident prevention device according to claim 5, characterized in that: A cylindrical mesh body (8) is provided on the outside of the buffer sleeve (4), and the mesh body (8) is connected to the end of the extension rod (7).

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