Crushing mechanism for cement sheath outside oil well casing

Abstract

The utility model discloses an oil well casing outer cement sheath crushing mechanism which comprises a side support and a crushing module located on the side support, a motor is horizontally installed on one side wall of the side support, an output shaft of the motor is coaxially connected with an inner supporting shaft, and the motor needs external electric power facilities to supply power. The crushing module comprises a sleeve fixedly arranged on the inner supporting shaft in a sleeving mode, a mounting ring slidably arranged on the outer wall of the sleeve in a sleeving mode and multiple sets of crushing teeth welded to the outer wall of the mounting ring, a baffle disc is welded to one side of the outer wall of the inner supporting shaft, and two symmetrically-distributed storage grooves are formed in the other side of the outer wall of the inner supporting shaft; the opposite side walls of the two storage grooves are fixedly connected with springs correspondingly, and the two springs are connected with elastic pieces correspondingly. Compared with a direct extrusion mode in the prior art, the crushing mechanism for the cement sheath outside the oil well casing is faster in crushing, meanwhile, the crushing teeth are convenient to integrally replace when damaged, external tools are not needed, the maintenance work is more convenient and faster, and the cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil well casings, in particular to an outer cement ring crushing mechanism of an oil well casing. Background Art

[0002] Oil well casing is a steel pipe used to support the wall of oil and gas wells to ensure the normal operation of the entire oil well during the drilling process and after completion. Each well uses several layers of oil well casing according to different drilling depths and geological conditions. After the oil well casing is lowered into the well, cement is used for cementing. Unlike oil pipes and drill pipes, it cannot be reused and is a disposable consumable material.

[0003] When encountering some oil well accidents, it is necessary to seal the well, and sealing the well requires cutting the horizontal section of the fallen oil well, that is, breaking and stripping the cement ring outside the oil well casing.

[0004] In the process of realizing the utility model, the inventors found that there are at least the following problems in the technology: the mechanism currently used for crushing the cement ring outside the oil well casing usually adopts an extrusion method (because the cement ring has a certain strength). This method is inefficient, and after the crushed components are damaged, the crushing mechanism can only be replaced as a whole, which is costly and troublesome.

[0005] Therefore, we propose a cement ring crushing mechanism outside the oil well casing to solve the above problems. Utility Model Content

[0006] The main purpose of the utility model is to provide a mechanism for crushing the cement ring outside the oil well casing, which has a faster crushing speed than the direct extrusion method in the prior art. At the same time, the crushing teeth are easy to replace as a whole when damaged and do not require the aid of external tools, making maintenance work more convenient, quick and cost-effective, and can effectively solve the problems in the background technology.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A mechanism for crushing cement rings outside casings of oil wells, comprising a side support and a crushing module located on the side support, wherein a motor is horizontally mounted on one side wall of the side support, wherein the output shaft of the motor is coaxially connected to an inner support shaft, and the motor needs to be powered by an external power facility, and the crushing module comprises a sleeve fixedly mounted on the inner support shaft, a mounting ring slidably mounted on the outer wall of the sleeve, and a plurality of crushing teeth welded to the outer wall of the mounting ring;

[0009] A baffle is welded on one side of the outer wall of the inner support shaft, and two symmetrically distributed receiving grooves are formed on the other side of the outer wall of the inner support shaft. Springs are fixedly connected to the side walls facing each other of the two receiving grooves, and spring sheets are connected to the two springs respectively. The spring sheets are fitted with the inner walls of the receiving grooves, and the two spring sheets are both in contact with the mounting ring, thereby limiting the positions of the mounting ring and the multiple groups of crushing teeth, and the two spring sheets are both formed with inclined surfaces on the side facing away from the mounting ring.

[0010] As a preferred embodiment, a protective shell is fixedly bonded to the side of the side bracket where the motor is located, wherein the motor is located inside the protective shell; so that the protective shell can protect the motor within a certain range.

[0011] As a preferred embodiment, the motor and the inner support shaft are distributed on both sides of the side bracket, and the inner support shaft is rotatably connected to the side bracket; so that the inner support shaft can operate stably under the drive of the motor.

[0012] As a preferred embodiment, multiple groups of crushing teeth are distributed at equal intervals along a straight line, and each group of crushing teeth is provided with multiple crushing teeth and distributed in a circular array along the central axis of the mounting ring; so that when the mounting ring and the multiple groups of crushing teeth rotate, the crushing teeth can be used to crush the cement ring more quickly.

[0013] As a preferred embodiment, a cylinder is installed on the side of the side bracket facing away from the inner support shaft, wherein a transmission rod is connected to the cylinder; the transmission rod is located between the side bracket and the inner support shaft.

[0014] As a preferred embodiment, a support is welded on the side of the conveying rod facing the mounting ring, and a contact plate is symmetrically connected to the support; the side of the contact plate facing the mounting ring is arc-shaped, and the curvature of the contact plate is the same as the curvature of the outer wall of the mounting ring, so that the contact plate can support the mounting ring after contacting the mounting ring to prevent it from falling when not in use.

[0015] In summary, the technical effects and advantages of the utility model are as follows:

[0016] The cement ring crushing mechanism outside the oil well casing drives the sleeve, the mounting ring and the crushing teeth thereon to operate by driving the motor, so that the crushing teeth can continuously contact and penetrate the cement ring, so that the structure of the cement ring is destroyed more quickly. Compared with the direct extrusion method in the prior art, the crushing is faster. At the same time, the crushing teeth are easy to replace as a whole when damaged and do not require external tools, so that the maintenance work is more convenient and faster and saves costs.

[0017] The mechanism for crushing the cement ring outside the oil well casing is driven by electricity to drive the inner support shaft, sleeve, mounting ring and multiple groups of crushing teeth to rotate. When the multiple groups of crushing teeth contact the cement ring, they can crush it. Since the crushing teeth are relatively sharp, it is easy to destroy the overall structure of the cement ring outside the oil well casing, thereby efficiently crushing the cement ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is the front view of the utility model;

[0020] Figure 3 It is a partial cross-sectional view of the utility model;

[0021] Figure 4 For this utility model Figure 3 A magnified view of the structure in the middle.

[0022] In the figure: 1. side bracket; 2. motor; 3. protective shell; 4. inner support shaft; 5. sleeve; 6. mounting ring; 7. crushing tooth; 8. storage groove; 9. spring; 10. spring piece; 11. inclined surface; 12. cylinder; 13. transmission rod; 14. support; 15. contact plate; 16. baffle. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] Reference Figure 1-Figure 4 , a mechanism for crushing cement ring outside casing of oil well, comprising a side bracket 1 and a crushing module located on the side bracket 1, a motor 2 is horizontally mounted on one side wall of the side bracket 1, a protective shell 3 is fixedly bonded to the side of the side bracket 1 where the motor 2 is located, wherein the motor 2 is located inside the protective shell 3, so that the protective shell 3 can protect the motor 2 within a certain range, wherein the output shaft of the motor 2 is coaxially connected with an inner support shaft 4, the motor 2 and the inner support shaft 4 are distributed on both sides of the side bracket 1, and the inner support shaft 4 is rotatably connected to the side bracket 1, so that the inner support shaft 4 can stably operate under the drive of the motor 2, and the motor 2 needs to be powered by external power facilities;

[0025] The crushing module includes a sleeve 5 fixedly sleeved and welded on the inner support shaft 4, a mounting ring 6 slidably sleeved on the outer wall of the sleeve 5, and multiple groups of crushing teeth 7 welded to the outer wall of the mounting ring 6. The multiple groups of crushing teeth 7 are evenly spaced along a straight line, and each group of crushing teeth 7 is provided with multiple and distributed in a circular array along the central axis of the mounting ring 6, so that when the mounting ring 6 and the multiple groups of crushing teeth 7 rotate, the crushing teeth 7 can be used to crush the cement ring more quickly;

[0026] A baffle 16 is welded on one side of the outer wall of the inner support shaft 4, one side of the mounting ring 6 contacts the baffle 16, and two symmetrically distributed receiving grooves 8 are formed on the other side of the outer wall of the inner support shaft 4. Springs 9 are fixedly connected to the side walls facing each other of the two receiving grooves 8, and two springs 9 are respectively connected to spring pieces 10, which fit the inner wall of the receiving groove 8. Both spring pieces 10 abut against the other side of the mounting ring 6, thereby limiting the positions of the mounting ring 6 and the multiple groups of crushing teeth 7, and both spring pieces 10 have inclined surfaces 11 formed on the side facing away from the mounting ring 6;

[0027] It is worth noting that a cylinder 12 is installed on the side of the side bracket 1 facing away from the inner support shaft 4, wherein a transmission rod 13 is connected to the cylinder 12, and the transmission rod 13 is located between the side bracket 1 and the inner support shaft 4, and a support 14 is welded on the side of the transmission rod 13 facing the mounting ring 6, and a contact plate 15 is symmetrically connected to the support 14, and the side of the contact plate 15 facing the mounting ring 6 is arc-shaped, and the curvature of the contact plate 15 is the same as the curvature of the outer wall of the mounting ring 6, so that the contact plate 15 can support the mounting ring 6 after contacting the mounting ring 6 to prevent it from falling when not in use.

[0028] The mechanism for crushing the cement ring outside the oil well casing: before use, the side bracket 1 can be fixed on a designated construction device so that the side bracket 1 can be close to the cement ring outside the oil well casing; when in use, the driving motor 2 is powered on to drive the inner support shaft 4, the sleeve 5, the mounting ring 6 and the multiple groups of crushing teeth 7 to rotate. When the multiple groups of crushing teeth 7 contact the cement ring, they can be crushed. Since the crushing teeth 7 are relatively sharp, it is easy to destroy the overall structure of the cement ring outside the oil well casing. Compared with the direct extrusion method in the prior art, the crushing efficiency of this scheme is higher; when the mechanism is not used, the cylinder 12 can be driven to drive the transmission rod 13, the support 14 and the two contact plates 15 to move, so that the two contact plates 15 contact the outer wall of the mounting ring 6 to support it and prevent it from falling; when the crushing teeth 7 are damaged, the two spring pieces 10 can be squeezed to shrink them into the two receiving grooves 8, and then the mounting ring 6 and the crushing teeth 7 are slid and removed from the sleeve 5 as a whole, and then a new part can be installed to complete the replacement.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A mechanism for crushing cement ring outside casing of an oil well, comprising a side support (1) and a crushing module located on the side support (1), characterized in that: A motor (2) is horizontally mounted on one side wall of the side bracket (1), wherein the output shaft of the motor (2) is coaxially connected to the inner support shaft (4), and the crushing module comprises a sleeve (5) fixedly sleeved on the inner support shaft (4), a mounting ring (6) slidably sleeved on the outer wall of the sleeve (5), and a plurality of groups of crushing teeth (7) welded to the outer wall of the mounting ring (6); A baffle (16) is welded to one side of the outer wall of the inner support shaft (4), and two symmetrically distributed receiving grooves (8) are formed on the other side of the outer wall of the inner support shaft (4). Springs (9) are fixedly connected to the opposite side walls of the two receiving grooves (8), and the two springs (9) are respectively connected to spring sheets (10). The spring sheets (10) are fitted with the inner wall of the receiving groove (8), and the two spring sheets (10) are both in contact with the mounting ring (6), and the two spring sheets (10) are formed with inclined surfaces (11) on the side facing away from the mounting ring (6).

2. The mechanism for crushing cement ring outside oil well casing according to claim 1, characterized in that: The side bracket (1) is located on the side where the motor (2) is located and is also fixedly bonded with a protective shell (3), wherein the motor (2) is located inside the protective shell (3).

3. The mechanism for crushing cement ring outside oil well casing according to claim 1, characterized in that: The motor (2) and the inner support shaft (4) are distributed on both sides of the side bracket (1), and the inner support shaft (4) is rotatably connected to the side bracket (1).

4. The mechanism for crushing cement ring outside oil well casing according to claim 1, characterized in that: The plurality of groups of crushing teeth (7) are distributed at equal intervals along a straight line, and each group of crushing teeth (7) is provided with a plurality of crushing teeth (7) distributed in a circular array along the central axis of the mounting ring (6).

5. The mechanism for crushing cement ring outside oil well casing according to claim 1, characterized in that: A cylinder (12) is installed on the side of the side bracket (1) facing away from the inner support shaft (4), wherein a transmission rod (13) is connected to the cylinder (12).

6. The mechanism for crushing cement ring outside oil well casing according to claim 5, characterized in that: A support (14) is welded to the side of the transmission rod (13) facing the mounting ring (6), and a contact plate (15) is symmetrically connected to the support (14).

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