Staggered sealing casing head blanking plug

Abstract

The utility model discloses a staggered sealing casing head blanking plug which comprises a plug, a sealing sliding block, a base, a first sealing ring and a second sealing ring. An opening is formed in the lower surface of the plug, and a water pipe connector communicated with the opening is arranged on the upper surface of the plug; a threaded section is arranged at the lower end of the inner wall of the plug and is in threaded connection with the outer wall of the to-be-detected sleeve; the sealing sliding block and the base are both arranged in the opening. The sealing sliding block comprises a first conical cylinder section and a first cylinder section which are sequentially connected from top to bottom. The base comprises a second conical cylinder section and a second cylindrical section which are sequentially connected from top to bottom. The sealing slide block is sleeved on the conical cylinder section II; the sealing ring I is arranged between the outer wall of the conical cylinder section I and the inner wall of the plug; the second sealing ring is arranged between the inner wall of the first cylinder section and the outer wall of the second cone section. The two sealing rings are distributed in the plug in a staggered mode to form double-layer sealing by arranging the sealing sliding block and the base, so that the sealing performance is enhanced, abrasion to the sealing rings is reduced, and meanwhile the sealing rings can be replaced more conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole tools, in particular to a dislocation type sealing casing head plugger. Background Art

[0002] During the oilfield drilling process, plugging devices are used as plugging tools to simulate downhole sealing pressure tests. After the casing is lowered and the wellhead casing head equipment is installed, the casing group of the oil and gas production well or water injection well needs to be tested for sealing. The casing head plugging device is needed. The application of the casing head plugging device can improve the efficiency of the casing sealing test.

[0003] However, existing plugs usually achieve sealing by cutting grooves in the inner wall of the plug and inserting sealing rings. Under ultra-high pressure conditions, stress concentration areas may crack and the sealing performance is not high. Secondly, the sealing rings are prone to rapid wear in the high temperature and high pressure environment underground, resulting in loss of seal and affecting the sealing effect. When the rubber ring is worn, it is difficult to remove it from the plug, which increases the difficulty of maintenance and replacement. Utility Model Content

[0004] In view of the above problems, the utility model aims to provide a staggered sealing sleeve head plug, which improves the sealing performance and can reduce the wear on the sealing ring.

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

[0006] A dislocation type sealing casing head plug, comprising a plug, a sealing slider, a base, a sealing ring 1 and a sealing ring 2; the lower surface of the plug is provided with an opening, and the upper surface thereof is provided with a water pipe joint connected with the opening; the lower end of the inner wall of the plug is provided with a threaded section, and the threaded section is threadedly connected with the outer wall of the casing to be tested;

[0007] The sealing slider and the base are both arranged in the opening, the sealing slider comprises a conical cylinder section 1 and a cylindrical section 1 which are sequentially connected from top to bottom; the base comprises a conical cylinder section 2 and a cylindrical section 2 which are sequentially connected from top to bottom, the maximum outer diameter of the conical cylinder section 2 is smaller than the outer diameter of the cylindrical section 2; the outer diameter of the cylindrical section 2 is larger than the inner diameter of the cylindrical section 1, and larger than the inner diameter of the sleeve; the sealing slider is sleeved on the conical cylinder section 2; the sum of the height of the sealing slider, the height of the cylindrical section 2 and the height of the threaded section is larger than the depth of the opening;

[0008] The sealing ring 1 is arranged between the outer wall of the conical cylinder section 1 and the inner wall of the plug; the sealing ring 2 is arranged between the inner wall of the cylindrical section 1 and the outer wall of the conical cylinder section 2.

[0009] Preferably, the sealing ring 1 and / or the sealing ring 2 is an O-ring.

[0010] Preferably, the side walls of the cone cylinder segment 1 and / or the cone cylinder segment 2 are arc-shaped, and the arc is concave toward the central axis of the cone cylinder segment 1 and / or the cone cylinder segment 2.

[0011] Preferably, the upper end of the inner wall of the plug is an arc-shaped surface, and the sealing ring 1 is arranged between the outer wall of the cone section 1 and the arc-shaped surface.

[0012] Preferably, an arc-shaped groove is provided at the lower end of the inner wall of the cylindrical section 1, and the sealing ring 2 is arranged between the arc-shaped groove and the outer wall of the conical cylinder section 2.

[0013] Preferably, the arc-shaped groove protrudes toward the central axis direction of the cylindrical segment 1.

[0014] Preferably, the upper end of the inner wall of the cone cylinder section 1 is provided with a chamfer.

[0015] Preferably, the inner diameters of the conical cylinder section 2 and the cylindrical cylinder section 2 are the same.

[0016] Preferably, the outer diameter of the bottom of the conical cylinder section 1 is the same as the outer diameter of the cylindrical section 1, and the inner diameter of the conical cylinder section 1 is the same as the inner diameter of the cylindrical section 1.

[0017] Preferably, the lower end of the cylindrical section 1 and the upper and lower ends of the cylindrical section 2 are both provided with chamfers.

[0018] The beneficial effects of the utility model are:

[0019] The utility model provides a sealing slide block and a base so that the first sealing ring and the second sealing ring can be staggered and distributed in the plug to form a double-layer seal, thereby enhancing the sealing performance and reducing the wear on the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a cross-sectional view of the utility model of the staggered sealing casing head plug;

[0022] Figure 2 This is a structural schematic diagram of the utility model of the staggered sealing casing head plug;

[0023] Figure 3It is a structural schematic diagram of the sealing slide block of the utility model of the staggered sealing casing head plug;

[0024] Figure 4 It is a structural schematic diagram of the base of the staggered sealing sleeve head plug of the utility model.

[0025] Numbers in the figure: 1-base, 2-sealing ring 1, 3-sealing slider, 4-sealing ring 2, 5-plug, 6-water pipe joint, 7-sleeve to be tested. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0027] It should be noted that, in the absence of conflict, the embodiments in this application and the technical features in the embodiments may be combined with each other.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0029] In the present invention, unless otherwise stated, the terms "first", "second", etc. are used to distinguish similar objects, rather than to describe a specific order or sequence. The terms used in this way should be understood; the terms "upper", "lower", "left", "right", etc. are usually used in relation to the directions shown in the drawings, or in relation to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inner", "outer", etc. refer to the inside and outside relative to the outline of each component itself. However, the above-mentioned directional words are not used to limit the present invention.

[0030] like Figure 1-4 As shown, a dislocation type sealing casing head plug includes a plug 5, a sealing slider 3, a base 1, a sealing ring 1 2 and a sealing ring 2 4; the lower surface of the plug 5 is provided with an opening, and the upper surface thereof is provided with a water pipe joint 6 connected with the opening; the lower end of the inner wall of the plug 5 is provided with a threaded section, and the threaded section is threadedly connected with the outer wall of the casing 7 to be tested;

[0031] The sealing slider 3 and the base 1 are both arranged in the opening, the sealing slider 3 comprises a conical cylinder section 1 and a cylindrical section 1 which are sequentially connected from top to bottom; the base 1 comprises a conical cylinder section 2 and a cylindrical section 2 which are sequentially connected from top to bottom, the maximum outer diameter of the conical cylinder section 2 is smaller than the outer diameter of the cylindrical section 2; the outer diameter of the cylindrical section 2 is larger than the inner diameter of the cylindrical section 1, and larger than the inner diameter of the sleeve; the sealing slider 3 is sleeved on the conical cylinder section 2; the sum of the height of the sealing slider 3, the height of the cylindrical section 2 and the height of the threaded section is larger than the depth of the opening;

[0032] The sealing ring 1 2 is arranged between the outer wall of the conical cylinder section 1 and the inner wall of the plug 5; the sealing ring 2 4 is arranged between the inner wall of the cylindrical section 1 and the outer wall of the conical cylinder section 2.

[0033] In a specific embodiment, the sealing ring 1 2 and / or the sealing ring 2 4 are O-rings.

[0034] In the above embodiment, when installing the offset sealing sleeve head plug, first put the plug 5 in place, and then put the sealing ring 1 2, the sealing slider 3, the sealing ring 2 4 and the base 1 into the set position in sequence. When using the utility model to simulate the downhole sealing pressure test, firstly, the plug 5 is threadedly connected with the casing to be tested 7, so that the casing to be tested 7 abuts against the lower surface of the base 1, and the base 1 presses the sealing slider 3 upward, thereby applying pressure to the sealing ring 1 2 and the sealing ring 2 4, and the sealing ring 1 2 fits between the plug 5 and the sealing slider 3, and the sealing ring 2 4 fits between the sealing slider 3 and the base 1, so that the sealing ring 1 2 and the sealing ring 2 4 can be staggered and distributed in the plug 5 to form a double-layer seal, and a high-pressure water gun is connected to the water pipe joint 6, and water is injected into the staggered sealing casing head plug and the casing 7 through the high-pressure water gun to gradually increase the pressure in the casing to be tested 7. When the test pressure is reached, the pressure is maintained for a period of time to verify the durability and stability of the casing to be tested 7 under continuous pressure.

[0035] By setting the sealing slider 3 and the base 1, the sealing ring 1 2 and the sealing ring 2 4 can be staggered and distributed in the plug 5 to form a double-layer seal, thereby enhancing the sealing performance; at the same time, it avoids direct contact between the sealing ring and the casing wall, thereby significantly extending the service life of the sealing ring and further improving the reliability and economy of the experiment. The components in the plug 5 are all arranged in a split type, so that the worn sealing ring is easy to remove, convenient for maintenance and replacement, and reduces maintenance costs.

[0036] In addition, the O-type sealing ring in the above embodiment is only a preferred structure of the present invention. In addition to the structure of the present invention, other sealing rings in the prior art can also be applied to the present invention. The present invention can also be applied to other test tools that need to undergo pressure tests.

[0037] In a specific embodiment, the side wall of the cone cylinder section 1 and / or the cone cylinder section 2 is arc-shaped, and the arc is concave toward the central axis of the cone cylinder section 1 and / or the cone cylinder section 2. The upper end of the inner wall of the plug 5 is an arc surface, and the sealing ring 1 2 is arranged between the outer wall of the cone cylinder section 1 and the arc surface. The lower end of the inner wall of the cylinder section 1 is provided with an arc groove, and the sealing ring 2 4 is arranged between the arc groove and the outer wall of the cone cylinder section 2. The arc groove protrudes toward the central axis direction of the cylinder section 1.

[0038] In the above embodiment, by providing the arc-shaped side wall, arc-shaped surface and arc-shaped groove, better stress distribution is provided, local stress concentration is reduced, and thus the wear on the sealing ring is reduced. The arc-shaped design enables the sealing ring to contact its adjacent side wall more evenly when under pressure, thereby improving the sealing effect. By providing the arc-shaped surface at the upper end of the inner wall of the plug 5, it is helpful to stably place the sealing ring 2, ensuring that it forms an effective seal with the outer wall of the cone section 1.

[0039] In a specific embodiment, the upper end of the inner wall of the conical cylinder section 1 is provided with a chamfer. The lower end of the cylindrical section 1 and the upper and lower ends of the cylindrical section 2 are both provided with chamfers. In this embodiment, the chamfers are provided to remove the sharp edges of the components to prevent cuts, making the components easier to assemble and disassemble.

[0040] In a specific embodiment, the inner diameters of the conical cylinder section 2 and the cylindrical cylinder section 2 are the same. The outer diameter of the bottom of the conical cylinder section 1 is the same as the outer diameter of the cylindrical cylinder section 1, and the inner diameter of the conical cylinder section 1 is the same as the inner diameter of the cylindrical cylinder section 1.

[0041] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A staggered sealing casing head plug, characterized in that: It comprises a plug, a sealing slider, a base, a sealing ring 1 and a sealing ring 2; the lower surface of the plug is provided with an opening, and the upper surface thereof is provided with a water pipe joint connected with the opening; the lower end of the inner wall of the plug is provided with a threaded section, and the threaded section is threadedly connected with the outer wall of the casing to be tested; The sealing slider and the base are both arranged in the opening, the sealing slider comprises a conical cylinder section 1 and a cylindrical section 1 which are sequentially connected from top to bottom; the base comprises a conical cylinder section 2 and a cylindrical section 2 which are sequentially connected from top to bottom, the maximum outer diameter of the conical cylinder section 2 is smaller than the outer diameter of the cylindrical section 2; the outer diameter of the cylindrical section 2 is larger than the inner diameter of the cylindrical section 1, and larger than the inner diameter of the sleeve; the sealing slider is sleeved on the conical cylinder section 2; the sum of the height of the sealing slider, the height of the cylindrical section 2 and the height of the threaded section is larger than the depth of the opening; The sealing ring 1 is arranged between the outer wall of the conical cylinder section 1 and the inner wall of the plug; the sealing ring 2 is arranged between the inner wall of the cylindrical section 1 and the outer wall of the conical cylinder section 2.

2. The offset sealing sleeve head plug according to claim 1 is characterized in that: The sealing ring 1 and / or the sealing ring 2 are O-type sealing rings.

3. The offset sealing sleeve head plug according to claim 1 is characterized in that: The side walls of the cone cylinder segment 1 and / or the cone cylinder segment 2 are arc-shaped, and the arc is concave toward the central axis of the cone cylinder segment 1 and / or the cone cylinder segment 2.

4. The offset sealing sleeve head plug according to claim 1 is characterized in that: The upper end of the inner wall of the plug is an arc-shaped surface, and the sealing ring 1 is arranged between the outer wall of the cone cylinder section 1 and the arc-shaped surface.

5. The offset sealing sleeve head plug according to claim 1 is characterized in that: An arc-shaped groove is formed at the lower end of the inner wall of the first cylindrical section, and the second sealing ring is arranged between the arc-shaped groove and the outer wall of the second conical cylindrical section.

6. The offset sealing sleeve head plug according to claim 5 is characterized in that: The arc-shaped groove protrudes toward the central axis direction of the cylindrical segment 1.

7. The offset sealing sleeve head plug according to claim 1 is characterized in that: The upper end of the inner wall of the cone cylinder section 1 is provided with a chamfer.

8. The offset sealing sleeve head plug according to claim 1 is characterized in that: The inner diameters of the conical cylinder section 2 and the cylindrical cylinder section 2 are the same.

9. The offset sealing sleeve head plug according to claim 1, characterized in that: The outer diameter of the bottom of the conical cylinder section 1 is the same as the outer diameter of the cylindrical section 1, and the inner diameter of the conical cylinder section 1 is the same as the inner diameter of the cylindrical section 1.

10. The offset sealing sleeve head plug according to claim 1, characterized in that: The lower end of the cylindrical section 1 and the upper and lower ends of the cylindrical section 2 are both provided with chamfers.

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