Expansion type packer

Abstract

An expansion type packer relates to the field of oil field downhole tools and comprises a central pipe, a sleeve, an expansion sleeve, an expansion sleeve and an expansion sleeve, the rubber barrel is located on the outer side of the center pipe, the two ends of the rubber barrel are connected to the two ends of the center pipe through connecting pieces, and a hydraulic cavity is formed in the inner side of the rubber barrel and communicates with the inner space of the center pipe through a through hole in the pipe wall of the center pipe; the upper end and the lower end of each hydraulic cavity are each provided with a lip-shaped sealing part, and all the sealing parts are attached to the inner wall of the center pipe. And an overturning supporting part made of a rubber material is connected between each of the two sealing parts in the middle of the rubber barrel and the inner wall of the rubber barrel. According to the utility model, the lip-shaped sealing part is arranged in the rubber sleeve, so that the loading capacity of a sealing structure formed by the outer wall of the rubber sleeve and the inner wall of the sleeve is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to oilfield downhole tool field, especially relates to a expansion type packer. BACKGROUND

[0002] Expansion type packer is the common packer type in oilfield, the outside of expansion type packer is provided with rubber tube made of rubber material, when using, inject high pressure water to the inside of rubber tube, rubber tube expands outward under the action of water pressure, the rubber tube after expansion is finally attached to the inner wall of downhole casing, thereby the space on the upper and lower sides of rubber tube is sealed.

[0003] In prior art, the inside of rubber tube is liquid, when the upper and lower sides of rubber tube outer wall bear pressure, the fluidity of liquid makes the supporting property of rubber tube inside poor, thereby the pressure bearing capacity of the sealing structure formed by expansion type packer and casing inner wall is poor. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of expansion type packer, the purpose is to optimize the rubber tube structure of traditional expansion type packer, to improve the pressure bearing capacity of expansion type packer.

[0005] The technical problem solved by the utility model is realized using the following technical scheme: the utility model provides a kind of expansion type packer, comprising:

[0006] Center tube, center tube is located in casing, and coaxial with casing;

[0007] Rubber tube, rubber tube is located in the outside of center tube, the two ends of rubber tube are connected in the two ends of center tube by connecting piece, and the inside of rubber tube is provided with hydraulic cavity, and hydraulic cavity is communicated with the inside space of center tube by through hole on center tube wall;

[0008] The hydraulic cavity in the inside of rubber tube is two, and two hydraulic cavities are symmetrically arranged in the inside space of rubber tube;

[0009] Each of the upper and lower ends of each hydraulic cavity is provided with a lip-shaped sealing part, and each sealing part is attached to the inner wall of center tube, so as to seal the upper and lower ends of hydraulic cavity;

[0010] Two sealing parts located in the middle of rubber tube are each connected with a turnover support part made of rubber material between rubber tube inner wall, after injecting high pressure water into hydraulic cavity, pressure can push turnover support part to deform and turn over, after turning over, turnover support part can support the middle of rubber tube on the inside of rubber tube, to improve the pressure bearing capacity of outside.

[0011] As preferred scheme, two sealing parts corresponding to each hydraulic cavity are respectively called end sealing part and intermediate sealing part, end sealing part is located in the end of rubber tube, and intermediate sealing part is located in the middle of rubber tube.

[0012] Each rubber tube is made of rubber material and is integrated with the rubber tube, and the sealing part is attached to the outer wall of the center tube to seal the upper and lower ends of the hydraulic cavity;

[0013] The turnover support part is connected between the intermediate sealing part and the inner wall of the rubber tube, and the two ends of the turnover support part are integrated with the intermediate sealing part and the inner wall of the rubber tube, respectively.

[0014] As a preferred solution, a gap is left between the two turnover support parts corresponding to the two hydraulic cavities, and the width of the gap in the axial direction of the rubber tube is less than twice the wall thickness of the turnover support part, so that the upper and lower turnover support parts can abut against and support each other after being reversed.

[0015] As a preferred solution, before the rubber tube expands, the inner wall of the turnover support part is attached to the outer wall of the center tube, and the outer wall of the turnover support part is attached to the inner wall of the rubber tube.

[0016] An annular groove is arranged at the connection between the intermediate sealing part and the turnover support part, and the cross-sectional shape of the annular groove is a right-angled triangle.

[0017] As a preferred solution, the through hole is long strip-shaped, and the width of the through hole is not greater than 1mm.

[0018] The technical effect of the utility model is:

[0019] 1. The utility model discloses a lip-shaped sealing part arranged in the rubber tube, and after high-pressure water is injected into the inner side of the rubber tube, the lip-shaped sealing part is pressed against the outer wall of the center tube by water pressure, and the greater the water pressure, the greater the contact pressure between the sealing part and the outer wall of the center tube, and the better the sealing effect. The sealing enhancement effect of the lip-shaped sealing part enables the hydraulic cavity to be sealed with higher-pressure water, and the higher-pressure water enables the contact pressure between the outer wall of the rubber tube and the inner wall of the sleeve to be improved, thereby improving the pressure-bearing capacity of the sealing structure composed of the outer wall of the rubber tube and the inner wall of the sleeve.

[0020] 2. The utility model discloses a turnover support part arranged between the sealing part and the inner wall of the rubber tube, which is extended under the action of pressure after being reversed and supported between the rubber tube and the center tube, and the greater the pressure, the greater the extension degree of the turnover support part and the stronger the support force on the inner side of the rubber tube. After the rubber tube expands, the turnover support part forms a continuous annular support structure on the inner side of the rubber tube, thereby further improving the pressure-bearing capacity of the sealing structure composed of the outer wall of the rubber tube and the inner wall of the sleeve.

[0021] In addition, the number of turnover support parts is two, and they are both located in the middle part of the rubber tube. After being reversed, the two turnover support parts abut against and support each other, thereby further improving the support performance and the pressure-bearing capacity of the outer side of the rubber tube. DRAWINGS

[0022] Figure 1 It is the whole structure schematic diagram of the utility model.

[0023] Figure 2 It is Figure 1 The partial enlarged view of the inside structure of the rubber sleeve.

[0024] In the drawing: 1, rubber sleeve; 2, end sealing part; 3, through hole; 4, intermediate sealing part; 5, annular groove; 6, overturning support part; 7, gap; 8, sleeve pipe. Specific implementation

[0025] The utility model is further described below in combination with the drawings.

[0026] As Figure 1 Indicated, the embodiment includes: center pipe, center pipe is located in downhole sleeve 8, and with sleeve 8 coaxial.Rubber sleeve 1, rubber sleeve 1 is located at the outside of center pipe, and the both ends of rubber sleeve 1 are connected in the both ends of center pipe by connecting piece, as preferred scheme, in the embodiment, one end of rubber sleeve 1 is fixedly connected with center pipe, and the other end is slidably connected with center pipe, and such connecting structure will not cause restriction to the deformation of rubber sleeve 1 during the expansion of rubber sleeve 1.

[0027] As Figure 1 、 2 Indicated, in the embodiment, the inside of rubber sleeve 1 is provided with hydraulic cavity, and the hydraulic cavity is communicated with the inside space of center pipe through through hole 3 on the wall of center pipe.When setting, high-pressure water in center pipe enters the inside of rubber sleeve 1 through through hole 3, and then extrudes rubber sleeve 1, so that rubber sleeve 1 expands outward and the diameter increases.

[0028] As Figure 1 Indicated, in the embodiment, the inside of rubber sleeve 1 is provided with hydraulic cavity, and the hydraulic cavity is communicated with the inside space of center pipe through through hole 3 on the wall of center pipe.When setting, high-pressure water in center pipe enters the inside of rubber sleeve 1 through through hole 3, and then extrudes rubber sleeve 1, so that rubber sleeve 1 expands outward and the diameter increases.

[0029] As Figure 1 、 2As shown in the drawings, in the embodiment, two sealing parts corresponding to each hydraulic cavity are respectively called end sealing part 2 and intermediate sealing part 4, the end sealing part 2 is located at the end of the rubber tube 1, and the intermediate sealing part 4 is located at the middle of the rubber tube 1; each is made of rubber material and is integrated with the rubber tube 1, and the sealing part is attached to the outer wall of the center tube, thereby sealing the upper and lower ends of the hydraulic cavity; the turnover supporting part 6 is connected between the intermediate sealing part 4 and the inner wall of the rubber tube 1, and the two ends of the turnover supporting part 6 are respectively integrated with the intermediate sealing part 4 and the inner wall of the rubber tube 1. After high-pressure water is injected into the inner side of the rubber tube 1, the main part of the rubber tube 1 expands under the action of pressure, the intermediate sealing part 4 slides to the middle of the rubber tube 1 under the action of pressure, and the turnover supporting part 6 turns over under the action of pressure, thereby supporting the inner wall of the rubber tube 1.

[0030] As shown in the drawings, Figure 1 , 2 in the embodiment, a gap 7 is left between the two turnover supporting parts 6 corresponding to the two hydraulic cavities, and the width of the gap 7 in the axis direction of the rubber tube 1 is less than twice the wall thickness of the turnover supporting part 6. The limitation of the width of the gap 7 makes the upper and lower turnover supporting parts 6 abut against each other and support each other after turning over, further enhancing the supporting performance, thereby further improving the pressure-bearing capacity of the outer side of the rubber tube 1.

[0031] As shown in the drawings, Figure 1 , 2 in the embodiment, before the expansion of the rubber tube 1, the inner wall of the turnover supporting part 6 is attached to the outer wall of the center tube, and the outer wall of the turnover supporting part 6 is attached to the inner wall of the rubber tube 1. This structure can make full use of the limited space on the inner side of the rubber tube 1, maximize the wall thickness of the turnover supporting part 6, and further improve its supporting performance. In addition, in order to make the turnover supporting part 6 turn over smoothly and not affect the sealing performance of the intermediate sealing part 4 after turning over, in the embodiment, an annular groove 5 is arranged at the connection between the intermediate sealing part 4 and the turnover supporting part 6, the annular groove 5 plays the role of a crease, the cross-sectional shape of the annular groove 5 is a right triangle, and the space of the annular groove 5 disappears after the turnover supporting part 6 turns over.

[0032] As shown in the drawings, Figure 1 , 2 in the embodiment, the through hole 3 is long strip-shaped, and the width of the through hole 3 is not greater than 1mm, which is conducive to filtering impurities such as sand.

Claims

1. An inflatable packer, characterized by, The utility model relates to a high-pressure water injection device for oil well, which comprises the following parts: a center tube is located in the sleeve (8) and coaxial with the sleeve (8); a rubber cylinder (1) is located outside the center tube, the two ends of the rubber cylinder (1) are connected to the two ends of the center tube through connecting pieces, and the inner side of the rubber cylinder (1) is provided with a hydraulic cavity, which communicates with the internal space of the center tube through a through hole (3) on the wall of the center tube; the hydraulic cavity on the inner side of the rubber cylinder (1) has two, and the two hydraulic cavities are symmetrically arranged in the internal space of the rubber cylinder (1); each of the two ends of each hydraulic cavity is provided with a lip-shaped sealing part, and each sealing part is attached to the inner wall of the center tube, thereby sealing the upper and lower ends of the hydraulic cavity; two sealing parts located in the middle of the rubber cylinder (1) are connected with the inner wall of the rubber cylinder (1) through a turning support part (6) made of rubber material, and after high-pressure water is injected into the hydraulic cavity, the pressure can push the turning support part (6) to deform and turn over, and after turning over, the turning support part (6) can support the middle part of the rubber cylinder (1) on the inner side of the rubber cylinder (1), thereby improving the pressure-bearing capacity of the outer side.

2. The swellable packer of claim 1, wherein: The two sealing parts corresponding to each hydraulic cavity are respectively called end sealing parts (2) and intermediate sealing parts (4), the end sealing parts (2) are located at the ends of the rubber cylinder (1), and the intermediate sealing parts (4) are located in the middle of the rubber cylinder (1); each rubber cylinder (1) is made of rubber material and is integrated with the rubber cylinder (1), and the sealing part is attached to the outer wall of the center tube, thereby sealing the upper and lower ends of the hydraulic cavity; the turning support part (6) is connected between the intermediate sealing part (4) and the inner wall of the rubber cylinder (1), and the two ends of the turning support part (6) are integrated with the intermediate sealing part (4) and the inner wall of the rubber cylinder (1).

3. The swellable packer of claim 2, wherein: A gap (7) is left between the two turning support parts (6) corresponding to the two hydraulic cavities, and the width of the gap (7) in the axial direction of the rubber cylinder (1) is less than twice the wall thickness of the turning support part (6), so that the two turning support parts (6) can abut against and support each other after turning over.

4. The swellable packer of claim 2, wherein: Before the rubber cylinder (1) expands, the inner wall of the turning support part (6) is attached to the outer wall of the center tube, and the outer wall of the turning support part (6) is attached to the inner wall of the rubber cylinder (1); the connection between the intermediate sealing part (4) and the turning support part (6) is provided with an annular groove (5), and the cross section of the annular groove (5) is in the shape of a right triangle.

5. The swellable packer of claim 1, wherein: The through hole (3) is long strip-shaped, and the width of the through hole (3) is not greater than 1mm.

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