Compression type packer rubber sleeve embedded with zigzag springs

Abstract

The invention relates to the technical field of oil exploitation, in particular to a compression type packer rubber sleeve embedded with zigzag springs. The packer rubber sleeve comprises a rubber sleeve body and two springs, the rubber sleeve body is installed on a packer, the rubber sleeve body and the springs are arranged to be of an integrated structure, the movement process of the rubber sleeve body and the movement process of the springs are kept synchronous, the number of the springs is two, the two springs are the first spring and the second spring respectively, and the first spring and the second spring are arranged on the rubber sleeve body. Shoulders on the two sides of the rubber sleeve body are connected with springs respectively, the rubber sleeve body comprises two side rubber sleeves and a middle rubber sleeve, the two side rubber sleeves are the first side rubber sleeve and the second side rubber sleeve respectively, and the middle rubber sleeve is arranged between the first side rubber sleeve and the second side rubber sleeve. According to the compression type packer rubber sleeve embedded with the zigzag spring, the structure is simple and reliable, the rubber sleeve body and the spring embedded in the shoulder portion of the rubber sleeve body are of an integrated structure, the shoulder protrusion effect can be effectively improved, and meanwhile the spring is prevented from being extruded out of the rubber sleeve body during setting.

Description

Technical Field

[0001] The invention relates to the technical field of oil exploitation, in particular to a compression type packer rubber cylinder inlaid with a snake spring. Background Art

[0002] The compression packer is an important downhole tool for oil and gas field reservoir transformation and production operations. Its main function is to compress the rubber cylinder mechanically to deform it and occupy the annular space between the packer and the casing to achieve sealing. The rubber cylinder is the core part of the compression packer. During the pressurized setting process of the conventional compression packer, both sides of the rubber cylinder directly contact the metal shoulder of the packer. Since the outer diameter of the metal shoulder is smaller than the outer diameter of the rubber cylinder after expansion, stress concentration often occurs in a small area of ​​the shoulder at one end of the rubber cylinder, resulting in uneven deformation of the entire rubber cylinder and the so-called "shoulder protrusion" effect. The shoulder protrusion of the rubber cylinder will reduce the contact pressure between the rubber cylinder and the casing of the outer pipe string, and destroy the distribution law of the contact pressure, so that the sealing performance of the rubber cylinder is reduced.

[0003] At present, the main method to improve the "shoulder protrusion" effect is to embed coil spring rings on the shoulders of both ends of the side rubber tube, and vulcanize the spring rings and the rubber body of the rubber tube together during the rubber tube processing. During the setting process, the coil spring ring expands and contracts with the rubber tube, enhancing the rigidity of the rubber tube shoulder and improving the force. In the actual application process, although this type of rubber tube can suppress the "shoulder protrusion" of the rubber tube to a certain extent, the spring ring is often squeezed out of the rubber tube during the setting process, resulting in damage to the rubber tube and reducing the sealing performance of the rubber tube. The main reason is that during the setting, the metal shoulder squeezes the side rubber tube, and the coil spring ring is embedded in the edge of the end face of the side rubber tube. Although the force on the shoulder of the rubber tube is improved to a certain extent, the coil spring ring does not contact the metal shoulder, and when the coil spring ring is subjected to force in the vertical direction, it cannot produce a tendency to expand outward. Therefore, it is easy to cause the deformation between the rubber body and the coil spring ring to be asynchronous, resulting in the spring easily detaching from the rubber body of the rubber tube, causing damage to the rubber tube and affecting the sealing effect. Therefore, in view of the above shortcomings, a compression packer rubber cylinder embedded with a snake spring is proposed. Summary of the invention

[0004] 1. Technical issues to be resolved The invention provides a compression packer rubber cylinder embedded with a snake spring, so as to overcome the problems in the prior art that the shoulder of the side rubber cylinder is subjected to uneven force during the setting process of the packer, the spring is easy to damage the rubber cylinder, and the sealing failure is caused.

[0005] (II) Technical solution In order to solve the above problems, the present invention provides a compression packer rubber cylinder embedded with a snake spring, comprising: A rubber cylinder body and a spring, wherein the rubber cylinder body is installed on the packer, and the rubber cylinder body and the spring are set as an integrated structure, the movement process of the rubber cylinder body and the movement process of the spring are kept synchronous, the number of the springs is two, the two springs are respectively a first spring and a second spring, the shoulders on both sides of the rubber cylinder body are respectively connected to the springs, the rubber cylinder body includes a side rubber cylinder and a middle rubber cylinder, the number of the side rubber cylinders is two, the two side rubber cylinders are respectively a first side rubber cylinder and a second side rubber cylinder, and the middle rubber cylinder is between the first side rubber cylinder and the second side rubber cylinder.

[0006] Preferably, the rubber cartridge body and the spring can be deformed synchronously during the compression process.

[0007] Preferably, the spring is a serpentine spring, and the spring can achieve axial deformation and radial deformation when subjected to axial force.

[0008] Preferably, the spring can achieve axial deformation and radial deformation when subjected to radial force.

[0009] Preferably, a first spring is embedded in the shoulder of one end of the first side rubber tube by vulcanization, and a second spring is embedded in the shoulder of one end of the second side rubber tube by vulcanization.

[0010] Preferably, the first spring and the second spring are adapted to each other, and the first side rubber tube and the second side rubber tube are adapted to each other.

[0011] Preferably, the side rubber tube and the middle rubber tube are both made of rubber, and the thickness of the rubber layer of the side rubber tube is equal to the thickness of the rubber layer of the middle rubber tube.

[0012] Preferably, the side rubber tube and the middle rubber tube are both in a concentric circle structure, the circular cross-sectional diameter of the side rubber tube is equal to the circular cross-sectional diameter of the middle rubber tube, and the middle rubber tube and the side rubber tube are both installed on the packer.

[0013] (III) Beneficial effects The compression type sealer rubber cylinder embedded with a snake spring provided by the present invention has a simple and reliable structure. The rubber cylinder body and the spring embedded in its shoulder are an integrated structure, which can not only effectively improve the "shoulder protrusion" effect, but also further enhance the shoulder rigidity of the rubber cylinder body, improve the sealing reliability, and avoid the spring being squeezed out of the rubber cylinder body during sealing, thereby damaging the rubber cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a compression type packer rubber cylinder embedded with a snake spring according to an embodiment of the present invention; Figure 2 The figure is a schematic structural diagram of a spring embedded with a snake spring according to an embodiment of the present invention.

[0015] Legend: 1-side rubber cylinder; 2-middle rubber cylinder; 3-spring. Implementation

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by “upper”, “lower”, “inside”, “outside”, “top”, “bottom”, etc. are all based on the orientations or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] Figure 1 This is a schematic structural diagram of a compression packer rubber cylinder embedded with a snake spring according to an embodiment of the present invention. Figure 2 FIG. 1 is a schematic diagram of the structure of a spring embedded with a snake spring according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, including: A rubber cylinder body and a spring 3, wherein the rubber cylinder body is installed on the packer, and the rubber cylinder body and the spring 3 are set as an integrated structure, and the movement process of the rubber cylinder body and the movement process of the spring 3 are kept synchronous, and the number of the springs 3 is two, and the two springs 3 are respectively a first spring and a second spring, and the shoulders on both sides of the rubber cylinder body are respectively connected to the springs 3, and the rubber cylinder body includes a side rubber cylinder 1 and a middle rubber cylinder 2, and the number of the side rubber cylinders 1 is two, and the two side rubber cylinders 1 are respectively a first side rubber cylinder and a second side rubber cylinder, and the middle rubber cylinder 2 is between the first side rubber cylinder and the second side rubber cylinder.

[0019] In the rubber cylinder of the packer, the shoulders on both sides of the rubber cylinder body are connected to the springs 3 by vulcanization. There are two springs 3, namely the first spring and the second spring, which are adapted to each other. That is to say, the left side of the rubber cylinder body is inlaid with the first spring by vulcanization, and the right side of the rubber cylinder body is inlaid with the second spring by vulcanization. The rubber cylinder body and the spring 3 are an integrated structure. In practical applications, the rubber cylinder body is a rubber structure. When the rubber cylinder of the packer faces a pressure process, due to its unique integrated structure, the rubber cylinder body and the spring 3 can undergo synchronous deformation during the pressure process. In addition, the two sides of the rubber cylinder body are side rubber cylinders 1, and the middle rubber cylinder 2 is between the two side rubber cylinders 1. The two side rubber cylinders 1 are respectively the first side rubber cylinder and the second side rubber cylinder, and the first side rubber cylinder is adapted to the second side rubber cylinder. The first side rubber cylinder is connected to the middle rubber cylinder 2 by vulcanization, and the other side of the middle rubber cylinder 2 is connected to the second side rubber cylinder by vulcanization. Further, the shoulder at one end of the first side rubber cylinder is inlaid with the first spring by vulcanization, and the shoulder at one end of the second side rubber cylinder is inlaid with the second spring by vulcanization.

[0020] It should be noted that the spring 3 is a serpentine spring. Due to the particularity of the serpentine structure, the spring 3 can achieve axial deformation and radial deformation. Therefore, the spring 3 can achieve axial deformation and radial deformation when subjected to axial force, and the spring 3 can also achieve axial deformation and radial deformation when subjected to radial force.

[0021] In actual applications, because the main body of the rubber tube is made of rubber, the material of the side rubber tube 1 and the material of the middle rubber tube 2 are both rubber, the thickness of the rubber layer of the side rubber tube 1 is equal to the thickness of the rubber layer of the middle rubber tube 2, and the thickness of the rubber layer is not less than 100 mm. In addition, the side rubber tube 1 and the middle rubber tube 2 are both concentric circle structures, the side rubber tube 1 and the middle rubber tube 2 are cylinders, and the inside of the cylinder is connected to the metal shoulder of the packer. In order to allow the side rubber tube 1 to fully cooperate with the middle rubber tube 2, the circular cross-sectional diameter of the side rubber tube 1 is equal to the circular cross-sectional diameter of the middle rubber tube 2, and the size of the circular cross-sectional diameter can match the metal shoulder of the packer.

[0022] It should be noted that, because the rubber tube body is installed on the packer, the middle rubber tube 2 and the side rubber tube 1 are both installed on the packer. During installation, they are installed in the order of side rubber tube 1, middle rubber tube 2, and side rubber tube 1.

[0023] The present invention provides a compression type packer rubber cylinder embedded with a serpentine spring. In order to improve the "shoulder protrusion" effect of the current compression type packer rubber cylinder during sealing, enhance the rigidity of the rubber cylinder shoulder, and improve the sealing reliability, the packer rubber cylinder is composed of a side rubber cylinder 1, a middle rubber cylinder 2 and a spring 3, wherein the spring 3 is a serpentine spring, and the spring 3 with a serpentine structure is embedded in the shoulder at one end of the side rubber cylinder 1. During the processing, the serpentine spring and the rubber cylinder body with a rubber structure are vulcanized together. The spring 3 after being compressed can produce axial and radial deformation, further realizing synchronous deformation between the rubber rubber cylinder body and the spring 3, and avoiding the spring 3 being squeezed out of the rubber rubber cylinder body, causing damage to the rubber cylinder body.

[0024] In the prior art, spring rings are mostly used. Although the spring rings can expand and contract with the rubber tube, during the sealing process, the spring rings are often squeezed out of the rubber tube, causing damage to the rubber tube and reducing the sealing performance of the rubber tube. The main reason is that during the sealing, the metal shoulder of the packer squeezes the side rubber tube, and the spring ring is embedded in the edge of the side rubber tube end face. The spring ring does not contact the metal shoulder, and when the spring ring is stressed in the vertical direction, it cannot produce a tendency to expand outward. Therefore, it is easy to cause the deformation between the main body and the spring ring to be asynchronous, causing the spring to easily separate from the rubber tube, causing damage to the rubber tube.

[0025] The compression packer rubber cartridge embedded with a snake spring provided by the present invention can overcome the "shoulder protrusion" effect. The working principle of the compression packer rubber cartridge embedded with a snake spring is described in detail below: In the present embodiment, the packer rubber cylinder is composed of a side rubber cylinder 1, a middle rubber cylinder 2 and a spring 3, wherein the side rubber cylinder 1 and the middle rubber cylinder 2 are combined together to form a rubber cylinder body, the number of side rubber cylinders 1 and the number of springs 3 are equal, the number of side rubber cylinders 1 is two, the two side rubber cylinders 1 are respectively the first side rubber cylinder and the second side rubber cylinder, the number of springs 3 is also two, the two springs 3 are respectively the first spring and the second spring, in actual application, the springs 3 are respectively embedded on both sides of the rubber cylinder body, the first spring is embedded on the left side of the rubber cylinder body, and the second spring is embedded on the right side of the rubber cylinder body, and because the two sides of the rubber cylinder body are the side rubber cylinders 1, that is to say, the springs 3 are embedded in the shoulders of one end of the side rubber cylinders 1 on both sides of the rubber cylinder body, that is, the first spring is embedded in the shoulder of one end of the first side rubber cylinder, and the second spring is embedded in the shoulder of one end of the second side rubber cylinder.

[0026] In actual applications, the rubber cartridge body is a rubber structure, and the spring 3 is a serpentine spring. During the processing, the serpentine spring 3 is vulcanized together with the rubber cartridge body to form an integrated structure. Therefore, in the packer rubber cartridge, when the rubber cartridge body is compressed, due to the unique serpentine structure of the spring 3, the spring 3 can produce axial deformation and radial deformation. Because the spring 3 and the rubber cartridge body are an integrated structure, the synchronous deformation between the rubber cartridge body and the spring 3 can be achieved, thereby preventing the spring 3 from being squeezed out of the rubber cartridge body and causing damage to the rubber cartridge body.

[0027] It should be noted that the main body of the rubber tube is a rubber structure, which means that the side rubber tube 1 and the middle rubber tube 2 are both made of rubber. Since the main body of the rubber tube is installed on the packer, the side rubber tube 1 and the middle rubber tube 2 are both installed on the packer. During installation, they are installed in the order of the first side rubber tube, the middle rubber tube 2, and the second side rubber tube.

[0028] In this embodiment, the side rubber tube 1 and the middle rubber tube 2 are both concentric circle structures, and the rubber tube body is connected to the metal shoulder of the packer. In order to make the side rubber tube 1 match the middle rubber tube 2, the rubber layer thickness of the side rubber tube 1 is equal to the rubber layer thickness of the middle rubber tube 2. In actual application, the rubber layer thickness is 100mm, and the circular cross-sectional diameter of the side rubber tube 1 is equal to the circular cross-sectional diameter of the middle rubber tube 2, and the circular cross-sectional diameter can match the metal shoulder of the packer.

[0029] In actual application, when the packer is in the setting process, the metal shoulder of the packer squeezes the rubber tube 1 from the upper and lower directions. On the one hand, the force-bearing area of ​​the serpentine spring 3 in the vertical direction is large, and the metal shoulder can directly transmit the extrusion force to the end face of the serpentine spring 3 through the rubber material of the rubber tube body in the vertical direction. On the other hand, when the serpentine spring 3 is subjected to pressure in the axial direction or the radial direction, it will produce an outward expansion trend in the radial direction of the spring 3. Therefore, the deformation synchronization between the rubber rubber tube body and the spring 3 can be guaranteed to a large extent, and the spring 3 can be prevented from being squeezed out of the rubber rubber tube body, causing damage to the rubber tube body.

[0030] The compression type sealer rubber cylinder embedded with a snake spring provided by the present invention has a simple and reliable structure. The rubber cylinder body and the spring embedded in its shoulder are an integrated structure, which can not only effectively improve the "shoulder protrusion" effect, but also further enhance the shoulder rigidity of the rubber cylinder body, improve the sealing reliability, and avoid the spring being squeezed out of the rubber cylinder body during sealing, thereby damaging the rubber cylinder body.

[0031] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A compression packer rubber cylinder embedded with a snake spring, characterized in that: include: A rubber tube body and a spring (3), wherein the rubber tube body is installed on the packer, the rubber tube body and the spring (3) are set as an integrated structure, the movement process of the rubber tube body and the movement process of the spring (3) are kept synchronous, the number of the springs (3) is two, the two springs (3) are respectively a first spring and a second spring, the shoulders on both sides of the rubber tube body are respectively connected to the springs (3), the rubber tube body comprises a side rubber tube (1) and a middle rubber tube (2), the number of the side rubber tubes (1) is two, the two side rubber tubes (1) are respectively a first side rubber tube and a second side rubber tube, and the middle rubber tube (2) is located between the first side rubber tube and the second side rubber tube.

2. The compression packer rubber cylinder embedded with a snake spring according to claim 1, characterized in that: The rubber cylinder body and the spring (3) can deform synchronously during the compression process.

3. The compression packer rubber cylinder embedded with a snake spring according to claim 2, characterized in that: The spring (3) is a serpentine spring, and the spring (3) can achieve axial deformation and radial deformation when subjected to axial force.

4. The compression packer rubber cylinder embedded with a snake spring according to claim 2, characterized in that: The spring (3) can achieve axial deformation and radial deformation when subjected to radial force.

5. The compression packer rubber cylinder embedded with a snake spring according to claim 1, characterized in that: A first spring is embedded in the shoulder of one end of the first side rubber tube by vulcanization, and a second spring is embedded in the shoulder of one end of the second side rubber tube by vulcanization.

6. The compression packer rubber cylinder embedded with a snake spring according to claim 5, characterized in that: The first spring is adapted to the second spring, and the first side rubber tube is adapted to the second side rubber tube.

7. The compression packer rubber cylinder embedded with a snake spring according to claim 1, characterized in that: The material of the side rubber tube (1) and the material of the middle rubber tube (2) are both rubber, and the thickness of the rubber layer of the side rubber tube (1) and the thickness of the rubber layer of the middle rubber tube (2) are equal.

8. The compression packer rubber cylinder embedded with a snake spring according to claim 1, characterized in that: The side rubber tube (1) and the middle rubber tube (1) are both in a concentric circle structure, the circular cross-sectional diameter of the side rubber tube (1) is equal to the circular cross-sectional diameter of the middle rubber tube (2), and the middle rubber tube (2) and the side rubber tube (1) are both installed on the packer.

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