Reducing expansion head for expansion reinforcement

Abstract

The utility model relates to a variable-diameter expansion head for expansion reinforcement, which comprises a clamping sleeve, and is characterized in that the clamping sleeve is wrapped on the outer side of a reducing section at the front end of a release tube shell of a packer, the rear end of the clamping sleeve is fixedly connected with the release tube shell, and the front part of the clamping sleeve is of a two-section structure; a central pipe is in threaded connection with the interior of the release pipe shell, the front end of the central pipe is led out of the front end of the release pipe shell, an annular driving disc is fixed to the outer side wall of the central pipe, a conical contact face matched with the outer annular face of the annular driving disc is arranged on the inner wall of the front portion of the clamping sleeve, and a tooth-shaped structure is arranged on the outer wall of the front portion of the clamping sleeve. The packer solves the problems that an existing packer is complex in clamping structure and inconvenient to operate, operation is convenient, and the setting effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to a clamping structure for a packer, in particular to a variable diameter expansion head for expansion reinforcement. Background Art

[0002] The packer is a production device for oil field production, and is a special tool used to isolate oil, gas, and water layers in downhole casing or open hole. When in use, the packer needs to be lowered to the target layer, and after the external force is applied, the packer is released to seal the packer, separating the oil (gas, water) layers above and below the packer, and then the target layer is constructed. After the construction is completed, the packer is unsealed to complete the entire construction process.

[0003] At present, when continuous chemical water plugging or acidizing is performed on the formation, a packer is also required for pre-plugging. Before plugging, a clamping structure should be used to position the packer to support the packer, thereby ensuring the sealing effect. The existing clamping structure of the packer is relatively complex and inconvenient to operate. Utility Model Content

[0004] The utility model aims to provide a variable diameter expansion head for expansion reinforcement with a simple structure and reliable use, so as to solve the problems of the existing packer with a complicated clamping structure and inconvenient operation, facilitate operation and ensure the setting effect.

[0005] The technical solution of the utility model is:

[0006] A reducer for expansion reinforcement includes a clamping sleeve, and its technical highlights are: the clamping sleeve is wrapped around the outside of the front end reduced diameter section of the release tube shell of the packer, the rear end of the clamping sleeve is connected and fixed to the release tube shell, the front part of the clamping sleeve is a two-petal structure, the internal thread of the release tube shell is connected to a center pipe, the front end of the center pipe leads out of the front end of the release tube shell and an annular drive disk is fixed on the outer wall, the front inner wall of the clamping sleeve is provided with a conical contact surface that matches the outer ring surface of the annular drive disk, and the front outer wall of the clamping sleeve is provided with a tooth-shaped structure.

[0007] In the above-mentioned variable diameter expansion head for expansion reinforcement, the release tube shell is provided with a stop corresponding to the rear end of the clamping sleeve, and the outer circumferential surface of the rear end of the clamping sleeve and the outer circumferential surface of the release tube shell are located on the same circumferential surface.

[0008] In the above-mentioned variable diameter expansion head for expansion reinforcement, the front end diameter reduction section of the release tube shell is provided with an internal thread, the central tube is provided with an external thread matching the internal thread, and the front end of the release tube shell is provided with a threaded stop.

[0009] In the above-mentioned variable diameter expansion head for expansion reinforcement, the outer ring surface of the annular driving disk is a conical surface that matches the conical contact surface.

[0010] In the above-mentioned variable diameter expansion head for expansion reinforcement, the front part of the fixing sleeve is symmetrically provided with two axial narrow slits to form a two-petal structure.

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

[0012] When in use, the device is assembled with the packer, the center tube and the release shell are rotated and fixed in place at this time, the front end of the clamping sleeve is not subjected to external extrusion force, the packer is lowered into the well, and when it reaches the set depth position, the center tube is rotated continuously, and the center tube rotates and produces linear displacement, driving the annular drive disc to push the front end of the clamping sleeve to expand outward, so that the tooth-shaped structure outside the clamping sleeve is clamped with the well wall, and the expansion and positioning are realized, providing a stable support function for the packer to complete the setting. The utility model solves the problem that the clamping structure of the existing packer is relatively complicated and the operation is inconvenient, and the operation is convenient, and the setting effect is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the use state of the utility model;

[0014] Figure 2 yes Figure 1 Right view of;

[0015] Figure 3 It is a structural schematic diagram of the annular drive disk.

[0016] In the figure: 1. release tube shell, 2. clamping sleeve, 3. tooth-shaped structure, 4. annular driving disk, 5. sealing ball, 6. center tube, 7. external thread, 8. axial narrow gap. DETAILED DESCRIPTION

[0017] The utility model is described in detail according to the accompanying drawings of the specification.

[0018] like Figure 1 to Figure 3 As shown, the reducer for expansion reinforcement includes a clamping sleeve 2, which is wrapped around the outside of the front diameter reduction section of the release shell 1 of the packer, and the rear end of the clamping sleeve 2 is connected and fixed to the release shell 1, and the front part of the clamping sleeve 2 is a two-petal structure. The inner thread of the release shell 1 is connected with a central pipe 6, and the front end of the central pipe 6 leads out of the front end of the release shell 1 and an annular drive disk 4 is fixed on the outer wall. The front inner wall of the clamping sleeve 2 is provided with a conical contact surface that matches the outer annular surface of the annular drive disk 4, and the front outer wall of the clamping sleeve 2 is provided with a tooth structure 3.

[0019] In this embodiment, the front part of the clamping sleeve 2 is symmetrically provided with two axial narrow slits 8 to form a two-petal structure. The release tube shell 1 is provided with a stopper corresponding to the rear end of the clamping sleeve 2, and the outer peripheral surface of the rear end of the clamping sleeve 2 and the outer peripheral surface of the release tube shell 1 are located on the same circumferential surface. The front end of the release tube shell 1 is provided with an internal thread, the center tube 6 is provided with an external thread 7 that matches the internal thread, and the front end of the release tube shell 1 is provided with a threaded stopper. The outer ring surface of the annular drive disk 4 is a conical surface that matches the conical contact surface.

[0020] Working principle:

[0021] When in use, the device is assembled with the packer. The center pipe 6 and the release shell 1 are rotated and fixed in place at this time. The front end of the fixing sleeve 2 is not subjected to external extrusion force. The packer is lowered into the well to reach the set depth position. The center pipe is continuously rotated. The center pipe 6 rotates and produces a linear displacement, driving the annular drive disk 4 to push and squeeze the front end of the fixing sleeve 2 to expand outward, so that the tooth-shaped structure 3 on the outside of the fixing sleeve 2 is clamped with the well wall to achieve expansion positioning, and pressurize the sealing ball 5 to block the front end of the center pipe 6, and the sealing operation is continued.

[0022] After the construction is completed, the central pipe 6 is rotated in the reverse direction to drive the annular driving disc 4 to retreat, and the tooth-shaped structure 3 on the outer side of the clamping sleeve 2 is separated from the well wall. At this time, the packer can be pulled out.

[0023] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A variable diameter expansion head for expansion reinforcement, comprising a clamping sleeve, characterized in that: The fixing sleeve is wrapped around the outside of the front end reduced diameter section of the release tube shell of the packer, and the rear end of the fixing sleeve is connected and fixed to the release tube shell. The front part of the fixing sleeve is a two-petal structure. The internal thread of the release tube shell is connected with a center tube. The front end of the center tube leads out of the front end of the release tube shell and an annular drive disk is fixed on the outer wall. The front inner wall of the fixing sleeve is provided with a conical contact surface that matches the outer ring surface of the annular drive disk, and the front outer wall of the fixing sleeve is provided with a tooth-shaped structure.

2. The variable diameter expansion head for expansion reinforcement according to claim 1 is characterized in that: The release tube shell is provided with a stopper corresponding to the rear end of the clamping sleeve, and the outer circumferential surface of the rear end of the clamping sleeve and the outer circumferential surface of the release tube shell are located on the same circumferential surface.

3. The variable diameter expansion head for expansion reinforcement according to claim 1, characterized in that: The front end reduced diameter section of the release tube shell is provided with an internal thread, the central tube is provided with an external thread matching the internal thread, and the front end of the release tube shell is provided with a threaded stop.

4. The variable diameter expansion head for expansion reinforcement according to claim 1, characterized in that: The outer ring surface of the annular driving disk is a conical surface matched with the conical contact surface.

5. The variable diameter expansion head for expansion reinforcement according to claim 1, characterized in that: The front part of the clamping sleeve is symmetrically provided with two axial narrow slits to form a two-petal structure.

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