Dragging type packer

Abstract

The utility model discloses a dragging type packer, which relates to the technical field of packer equipment, and comprises an upper joint and a lower joint, the bottom of the upper joint is provided with a ring edge, the inner ring surface and the outer ring surface of the ring edge are provided with internal threads and external threads, the inner ring surface of the ring edge is in threaded connection with a central pipe, and the central pipe is in threaded connection with the lower joint. The outer ring face of the center pipe is sleeved with a rubber sleeve assembly, the top of the rubber sleeve assembly is connected with the ring edge, the bottom of the rubber sleeve assembly is connected with a floating head, and the bottom of the center pipe is in threaded connection with a lower connector. According to the dragging type packer, the expansion rubber sleeve is arranged outside the center pipe, the integrated expansion rubber sleeve has larger expansion capacity when expanding, the contact area between the integrated expansion rubber sleeve and a pipeline can be increased, therefore, the sealing capacity to the pipeline is improved, meanwhile, the dragging type packer can adapt to a larger pipeline, and the application range of the packer is enlarged.

Description

Technical Field

[0001] The utility model relates to the technical field of packer equipment, and more particularly to a drag-type packer. Background Art

[0002] A drag packer (also known as a pull packer or towed packer) is a device commonly used in the oil and gas industry and underwater engineering. It is mainly used to isolate a specific area in a pipeline system to facilitate maintenance, replacement or testing of a certain section without shutting down the entire system.

[0003] Chinese patent application number 201822009370.8 discloses a drag fracturing packer, which includes a setting mechanism, a center pipe, an upper joint, and a lower joint. The outer wall of the center pipe is milled with a reversing groove. The packer also includes a thrust mechanism and a rotating mechanism. The setting mechanism and the thrust mechanism are both mounted on the center pipe, with the setting mechanism located above the thrust mechanism. The rotating mechanism includes a thrust bearing, a wave spring, a rotating body, and a sliding pin. There are two thrust bearings and two wave springs, one rotating body, and one sliding pin. The two thrust bearings are respectively arranged at the upper and lower ends of the rotating body, and the two wave springs are respectively sandwiched between the thrust bearing and the rotating body. This drag fracturing packer still has the following problems during use:

[0004] 1. The rubber cartridge assembly on the center pipe is composed of multiple individual rubber cartridges. During the sealing operation, the multiple rubber cartridges expand to seal the pipe. However, due to the small volume of a single rubber cartridge, the expansion capacity is limited, which makes it easy to cause false sealing. At the same time, the pipes that can be applied are limited, and it is not suitable for pipes with larger diameters.

[0005] 2. The packer is usually used repeatedly. The rubber tube on the outer wall is made of rubber. After repeated expansion and use, it is easy to cause the rubber to deform and age, thereby affecting the sealing during use.

[0006] Therefore, it is necessary to propose a drag packer to solve the above problems. Utility Model Content

[0007] In response to the above problems, the present invention provides a drag-type packer; it has the function of increasing sealing performance and also broadening the scope of application. At the same time, it improves the tensile strength of the expansion rubber cylinder and avoids the occurrence of local abnormal deformation.

[0008] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0009] A drag-type packer comprises an upper joint and a lower joint, wherein the bottom of the upper joint is provided with a ring edge, the inner and outer ring surfaces of the ring edge are provided with internal and external threads, the inner ring surface of the ring edge is threadedly connected to a center pipe, the outer ring surface of the center pipe is sleeved with a rubber sleeve assembly, the top of the rubber sleeve assembly is connected to the ring edge, the bottom of the rubber sleeve assembly is connected to a floating head, and the bottom of the center pipe is threadedly connected to the lower joint;

[0010] The rubber cylinder assembly includes an expansion rubber cylinder and retaining rings located at both ends of the expansion rubber cylinder. The expansion rubber cylinder includes an expansion portion and connecting portions located at both ends of the expansion portion. The inner annular surface of the expansion portion is provided with a cavity. The central tube is provided with a liquid inlet located in the cavity. The liquid inlet is located at one end close to the upper joint.

[0011] The inner ring surface of the floating head is provided with a plurality of grooves, and sealing rings are connected in the plurality of grooves. The sealing rings are slidably connected with the outer ring surface of the central tube.

[0012] Preferably, the retaining ring is sleeved on the outer ring surface of the connecting part, and a plurality of annular grooves are provided on the outer ring surface of the connecting part. An annular boss inserted into the groove is provided on the inner ring surface of the retaining ring close to the connecting part, and the inner ring surface on the other side of the retaining ring is connected to the ring edge or floating head through a thread.

[0013] Preferably, the inner annular surface of the connecting portion is provided with anti-slip stripes arranged along the axis, and the outer annular surface of the ring edge is provided with a groove on the side away from the expansion rubber cylinder, and a sealing ring is connected in the groove.

[0014] Preferably, a plurality of fixing rings are symmetrically arranged inside the connecting portion, the outer sides of the plurality of fixing rings are connected to connecting strips, and the opposite sides of the upper and lower connecting strips are connected to tensile strips, and the tensile strips are located inside the expansion portion.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This device is equipped with an expansion rubber cylinder on the outside of the central pipe. The integrated expansion rubber cylinder has a greater expansion capacity when it expands, which can increase the contact area with the pipeline, thereby improving the sealing ability of the pipeline. At the same time, it can adapt to larger pipelines, increasing the applicability of the packer.

[0017] 2. This device has a triple reinforcement structure inside the expansion rubber cylinder. The fixing ring can prevent the connection part from deformation. The connecting strip increases the tensile strength of the bottom connection part when it moves upward. The tensile strip can prevent the expansion part from local over-expansion, which helps to maintain the consistency of expansion, thereby improving the service life of the expansion rubber cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0019] Figure 2 It is the explosion diagram in this utility model;

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

[0021] Figure 4 This is a partial cross-sectional view of the rubber cylinder assembly of the present invention;

[0022] Figure 5 This is a schematic diagram of the connecting strip and tensile strip structure in the present invention.

[0023] Reference numerals:

[0024] 101. Upper joint; 102. Lower joint; 103. Ring edge; 104. Center tube; 105. Floating head; 106. Expansion rubber cylinder; 107. Retaining ring; 108. Expansion part; 109. Connecting part; 110. Cavity; 111. Liquid inlet hole; 112. Sealing ring; 113. Slot; 114. Boss; 115. Fixing ring; 116. Connecting strip; 117. Tensile strip. DETAILED DESCRIPTION

[0025] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-5 , a drag-type packer, comprising an upper joint 101 and a lower joint 102, the bottom of which is used to connect a hydraulic setting tool for use in conjunction with each other. The hydraulic setting tool is not shown in the figure. The top of the upper joint 101 is used to connect the pipe string, and the bottom of the upper joint 101 is provided with a ring edge 103. The inner and outer ring surfaces of the ring edge 103 are provided with internal and external threads. The thread of the inner ring surface of the ring edge 103 is used to connect the central pipe 104, and the thread of the outer ring surface is used to connect the rubber sleeve assembly. The inner ring surface of the ring edge 103 is threadedly connected with the central pipe 104, and the outer ring surface of the central pipe 104 is sleeved with the rubber sleeve assembly. The top of the rubber sleeve assembly is connected to the ring edge 103, and the bottom of the rubber sleeve assembly is connected with a floating head 105. The floating head 105 can slide up and down on the outer wall of the central pipe 104 as the rubber sleeve assembly expands, and the bottom of the central pipe 104 is threadedly connected with the lower joint 102.

[0027] Since the traditional rubber tube assembly is composed of multiple rubber tubes, its expansion sealing ability is limited. The following provides a structure that can increase the expansion capacity of the rubber tube to improve the sealing performance: Figure 3 and Figure 4 The rubber cylinder assembly includes an expansion rubber cylinder 106 and retaining rings 107 located at both ends of the expansion rubber cylinder 106. The expansion rubber cylinder 106 includes an expansion portion 108 and connecting portions 109 located at both ends of the expansion portion 108. The connecting portion 109 on one side of the expansion rubber cylinder 106 is fixed, and the expansion portion 108 plays an expansion role, making the diameter larger, thereby playing a sealing role. The connecting portion 109 on the other side can slide up and down on the outer wall of the central tube 104 as the expansion portion 108 expands. The inner annular surface of the expansion portion 108 is provided with a cavity 110, and the liquid entering from the pipe string will pass through the inlet. The liquid hole 111 will enter the cavity 110, thereby pushing the expansion part 108 to expand. The central tube 104 is provided with a liquid inlet hole 111 located in the cavity 110. The liquid inlet hole 111 is located at one end close to the upper joint 101. The bottom is used in conjunction with a hydraulic setting tool. After it is lowered to a predetermined position, liquid is injected into the pipe string. Due to the pressure difference in the open hole in the coal mine, the fluid enters the expansion part 108 and the cavity 110 formed with the central tube 104 through the liquid inlet hole 111 on the central tube 104, causing the expansion rubber sleeve 106 to expand, thereby sealing the annular space of the open hole in the coal mine.

[0028] When unsealing is required, the pressure in the pipe string is released by decompression, and the liquid in the cavity 110 is released through the liquid inlet 111 and flows into the open hole, causing the rubber sleeve to shrink, thereby unsealing;

[0029] refer to Figure 3 The inner ring surface of the floating head 105 is provided with multiple grooves, and sealing rings 112 are connected to the multiple grooves. When the floating head 105 slides up and down, the sealing ring 112 increases the sealing performance when connected to the center tube 104, and the sealing ring 112 is slidably connected to the outer ring surface of the center tube 104.

[0030] Specifically, refer to Figure 3 and Figure 4 The retaining ring 107 is sleeved on the outer ring surface of the connecting part 109. The retaining ring 107 is located at both ends of the expansion rubber cylinder 106 and is used to fix one end of the rubber cylinder assembly on the upper joint 101. A plurality of annular grooves 113 are provided on the outer ring surface of the connecting part 109. An annular boss 114 is provided on the inner ring surface of the retaining ring 107 close to the connecting part 109 to insert into the slot 113. The boss 114 is inserted into the slot 113 to increase the stability of the connection between the retaining ring 107 and the expansion rubber cylinder 106. The inner ring surface on the other side of the retaining ring 107 is connected to the ring edge 103 or the floating head 105 by a thread.

[0031] Specifically, the inner ring surface of the connecting portion 109 is provided with anti-slip stripes arranged along the axis, and the anti-slip stripes are used to prevent the expansion rubber cylinder 106 from rotating left and right, so that one end can only move along the axis. The outer ring surface of the ring edge 103 is provided with a groove on the side away from the expansion rubber cylinder 106. Figure 3 The groove is located on the side of the thread away from the expansion rubber cylinder 106, and a sealing ring 112 is connected in the groove to increase the sealing performance when connected to the retaining ring 107.

[0032] The following provides a structure for enhancing the stability of the expansion rubber cylinder 106: Figure 5 Specifically, a plurality of fixing rings 115 are provided inside the symmetrical connecting portion 109. The fixing rings 115 are used to maintain the stability of the connecting portion 109 and prevent the connecting portion 109 from being deformed. When the connecting portion 109 is deformed, the sealing of both sides of the cavity 110 will be affected, thereby causing the liquid in the cavity 110 to leak out. The outer sides of the plurality of fixing rings 115 are connected to connecting strips 116, and the opposite sides of the upper and lower connecting strips 116 are connected to anti-tensile strips 117. The anti-tensile strips 117 are located in the expansion portion 108. When the expansion portion 108 expands, the anti-tensile strips 117 will be driven to move. The anti-tensile strips 117 can inhibit the expansion portion 108 and prevent local excessive deformation.

[0033] In this embodiment, the installation process of the packer is as follows:

[0034] Fix the upper joint 101 on the C-type vise and tighten it, install the center tube 104 on the inner ring surface of the ring edge 103 through the thread at one end, and tighten it with large and small chain pliers, then apply grease on the surface of the center tube 104 to facilitate the rubber cylinder assembly to be put on the center tube 104, and the retaining ring 107 on the rubber cylinder assembly can be rotated and thus installed on the external thread of the ring edge 103 through threads. Then, install the floating head 105 on the retaining ring 107 at the bottom of the rubber cylinder assembly through threads, and finally install the lower joint 102 on the bottom of the center tube 104 through threads, and the assembly is completed at this time.

[0035] The usage process is:

[0036] Connect the packer to the hydraulic sealing tool at the bottom, equip the corresponding pipe string at the top, slowly lower the pipe string to the designed position, connect the wellhead process water injection, and the coal mine drag packer can be sealed. The liquid in the pipe string will enter the cavity 110 through the liquid inlet hole 111, causing the expansion part 108 to expand outward, thereby sealing the pipeline. The expansion will drive the floating head 105 at the bottom to move upward. When the pipe string needs to be lifted, the orifice is directly depressurized and unsealed, and the pipe string is lifted out after the rubber sleeve shrinks (45 minutes).

[0037] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A drag packer, comprising an upper joint (101) and a lower joint (102), characterized in that: The bottom of the upper joint (101) is provided with a ring edge (103), the inner ring surface and the outer ring surface of the ring edge (103) are provided with internal threads and external threads, the inner ring surface of the ring edge (103) is threadedly connected to a center tube (104), the outer ring surface of the center tube (104) is sleeved with a rubber cylinder assembly, the top of the rubber cylinder assembly is connected to the ring edge (103), the bottom of the rubber cylinder assembly is connected to a floating head (105), and the bottom of the center tube (104) is threadedly connected to the lower joint (102); The rubber cylinder assembly includes an expansion rubber cylinder (106) and retaining rings (107) located at both ends of the expansion rubber cylinder (106). The expansion rubber cylinder (106) includes an expansion portion (108) and connecting portions (109) located at both ends of the expansion portion (108). A cavity (110) is formed on the inner annular surface of the expansion portion (108). A liquid inlet hole (111) located in the cavity (110) is formed on the central tube (104). The liquid inlet hole (111) is located at one end close to the upper joint (101). The inner ring surface of the floating head (105) is provided with a plurality of grooves, each of which is connected with a sealing ring (112), and the sealing ring (112) is slidably connected to the outer ring surface of the central tube (104).

2. A drag packer according to claim 1, characterized in that: The retaining ring (107) is sleeved on the outer ring surface of the connecting part (109), and a plurality of annular grooves (113) are provided on the outer ring surface of the connecting part (109). An annular boss (114) inserted into the groove (113) is provided on the inner ring surface of the retaining ring (107) on one side close to the connecting part (109), and the inner ring surface on the other side of the retaining ring (107) is connected to the ring edge (103) or the floating head (105) through a thread.

3. The drag packer according to claim 2, characterized in that: The inner ring surface of the connecting portion (109) is provided with anti-slip stripes arranged along the axis, and the outer ring surface of the ring edge (103) is provided with a groove on the side away from the expansion rubber cylinder (106), and a sealing ring (112) is connected in the groove.

4. A drag packer according to claim 3, characterized in that: A plurality of fixing rings (115) are symmetrically arranged inside the connecting portion (109), and connecting strips (116) are connected to the outside of the fixing rings (115). The upper and lower connecting strips (116) are connected to opposite sides thereof with tensile strips (117), and the tensile strips (117) are located inside the expansion portion (108).

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