Small diameter multi-tube insertion seal

Abstract

The utility model discloses a kind of small-diameter multi-tube insert seals, including pipe body, the pipe body outer wall sets up combination sealing element, the combination sealing element includes sealing element framework, the sealing element framework upper end outer wall sets up upward first conical sealing groove, the sealing element framework lower end outer wall sets up downward second conical sealing groove, the sealing element framework inner wall sets up inner sealing groove;First conical sealing groove, second conical sealing groove are arranged in inner conical surface sealing ring, inner sealing groove is arranged in inner sealing ring.The utility model uses combination sealing element, sealing has long-term effect and reliability.

Description

Technical Field

[0001] This utility model relates to the field of petroleum development technology, specifically a small-diameter multi-tube insert seal. Background Technology

[0002] In petroleum development processes, sealing plugs are commonly used tools. Their main function is to combine with a sealing cylinder to form an effective annular seal. Currently, commonly used sealing plugs typically employ O-ring seals. The main problem with this type of O-ring seal plug is that under high pressure, the O-ring is often squeezed out, causing seal failure. Additionally, the sealing plug is difficult to remove. Therefore, combination seals are used to replace conventional O-rings.

[0003] Publication No. CN114165187A discloses an insertion sealing device and its usage method, including a sealing seat and a sealing mechanism. The sealing seat has an axial through hole in its center, and the sealing mechanism is fitted onto the outer wall of the sealing seat. The sealing mechanism includes an upper sealing unit, a lower sealing unit, and an adjusting ring, all fitted onto the outside of the sealing seat. The upper and lower sealing units have the same structure and are symmetrically arranged. The inner wall of the adjusting ring is threadedly connected to the outer wall of the sealing seat. The upper end face of the adjusting ring contacts the bottom of the upper sealing unit, and the lower end face of the adjusting ring contacts the lower sealing unit.

[0004] Publication No. CN212837616U discloses an insertion sealing device for polymer injection and a concentric double-tube layered polymer injection string, including an outer tube and a core tube. The outer tube includes a female connector, a sealing tube, and a male connector, which are sealed and fixed from top to bottom. The inner diameters of the female connector, the sealing tube, and the male connector are the same. The upper inner wall of the female connector forms a first stepped hole with an enlarged diameter. The core tube can be slidably inserted into the outer tube in a sealed manner, and the outer wall of the core tube and the wall of the first stepped hole can form an annular sealing cavity.

[0005] Announcement No. CN211422582U discloses a sealing cannula and an air / water injection tubing string, including: a first packing group, a second packing group, and an upper connector, an intermediate body, and a lower connector connected in sequence; the upper connector and the lower connector are both used to connect small oil pipes, the first packing group is sleeved on the outer wall of the upper connector, and the second packing group is sleeved on the outer wall of the intermediate body.

[0006] The sealing rings in the aforementioned existing technologies are all conventional technologies, which are prone to detachment.

[0007] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0008] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, the present invention provides a small-diameter multi-tube insert seal.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A small-diameter multi-tube insert seal includes a tube body, a combined sealing element disposed on the outer wall of the tube body, the combined sealing element including a sealing element skeleton, a first conical sealing groove facing upward on the upper outer wall of the sealing element skeleton, a second conical sealing groove facing downward on the lower outer wall of the sealing element skeleton, and an inner sealing groove disposed on the inner wall of the sealing element skeleton; an inner conical sealing ring is disposed in the first conical sealing groove and the second conical sealing groove, and an inner sealing ring is disposed in the inner sealing groove.

[0011] Furthermore, the first conical sealing groove includes a first vertical positioning surface, an upper conical surface, and a first sealing positioning surface;

[0012] Specifically, the first vertical positioning surface extends vertically downward from the lower end of the sealing element skeleton;

[0013] Specifically, the first sealing positioning surface extends inward from the outer wall of the sealing element skeleton, and the first sealing positioning surface can match the end face of the inner conical sealing ring;

[0014] Specifically, the upper conical surface faces upward, and the upper conical surface is connected to the lower end of the first vertical positioning surface and the inner end of the first sealing positioning surface;

[0015] Specifically, the second conical sealing groove includes a second vertical positioning surface, a lower conical surface, and a second sealing positioning surface;

[0016] Specifically, the second vertical positioning surface extends vertically downward from the lower end of the sealing element skeleton;

[0017] Specifically, the second sealing positioning surface extends inward from the outer wall of the sealing element skeleton, and the second sealing positioning surface can match the end face of the inner conical sealing ring;

[0018] Specifically, the lower conical surface faces downwards, and the lower conical surface is connected to the lower end of the second vertical positioning surface and the inner end of the second sealing positioning surface.

[0019] Furthermore, the outer wall of the inner conical sealing ring is an arc surface, and the inner wall is an inner conical surface;

[0020] Specifically, the upper and lower end faces of the inner conical sealing ring are perpendicular to the inner conical surface, the first sealing positioning surface is perpendicular to the upper conical surface, and the second sealing positioning surface is perpendicular to the lower conical surface.

[0021] Furthermore, a positioning protrusion ring is provided on the outer wall of the tube. The lower end of the positioning protrusion ring has an outer ring protrusion ring and an inner ring concave ring structure. The upper end of the sealing element skeleton is inserted into the inner ring concave ring of the positioning protrusion ring, so that the outer ring protrusion ring of the positioning protrusion ring abuts against the transition of the upper arc surface end face of the inner conical sealing ring in the first conical sealing groove.

[0022] Specifically, a positioning ring is connected to the outer wall of the tube. The upper end of the positioning ring has an outer convex ring and an inner concave ring structure. The lower end of the sealing element skeleton is inserted into the inner concave ring of the positioning ring, so that the outer convex ring of the positioning ring abuts against the transition of the lower arc surface end face of the inner conical sealing ring in the second conical sealing groove.

[0023] Furthermore, the tube body and the positioning protrusion are integrally formed.

[0024] Furthermore, an upper connector is connected to the inner wall of the upper end of the pipe body, and a lower connector is connected to the inner wall of the lower end of the pipe body.

[0025] Furthermore, it also includes a cable passage structure, which includes a cable passage channel, which is an axial channel opened in the pipe body, and the cable passage channel is provided with connectors at the upper end face and the lower end face of the pipe body.

[0026] Furthermore, it also includes a connector protection structure, which includes an upper protective sleeve and a lower protective sleeve;

[0027] Specifically, the upper protective sleeve is connected to the upper outer wall of the tube body through an upper anti-rotation pin, and an upper shielding ring is provided at the upper end of the upper protective sleeve to contact the outer wall of the upper connector. The upper shielding ring is provided with an upper wire passage hole corresponding to the wire passage channel.

[0028] Specifically, the lower protective sleeve is connected to the lower outer wall of the tube body via a lower anti-rotation pin, and a lower shielding ring is provided on the lower inner wall of the lower protective sleeve to contact the outer wall of the lower connector. The lower shielding ring is provided with a lower wire passage hole corresponding to the wire passage channel.

[0029] Furthermore, the upper end of the lower protective sleeve is a convex outer ring of a positioning ring, and a positioning groove is provided on the outer wall of the tube in the area covered by the lower protective sleeve. A locking block is provided in the positioning groove, and the locking block cooperates with the lower protective sleeve to form a concave inner ring of the positioning ring.

[0030] Furthermore, at least two combined seals are provided, with a spacer ring between each pair of combined seals. The upper and lower ends of the spacer ring are both outer ring convex rings and inner ring concave rings, which cooperate with the corresponding combined seals.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. This utility model uses a combination of sealing components, which provides long-lasting and reliable sealing.

[0033] 2. This utility model can achieve built-in NPT connectors in space-constrained and small-diameter applications, with hydraulic lines passing through the multi-pipe seal body, which can protect and fix the hydraulic lines; the lines can be pre-installed, saving on-site line crossing time and simplifying operation. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a small-diameter multi-tube insert seal according to this utility model.

[0035] Figure 2 This is a schematic diagram of the structure of the tube body in this utility model.

[0036] Figure 3 This is a schematic diagram of the structure of the sealing element skeleton in this utility model.

[0037] Figure 4 This is a schematic diagram of the application of this utility model in injection and production wells.

[0038] In the diagram: 1. Upper connector; 2. Upper protective sleeve; 3. NPT connector; 4. Upper anti-rotation pin; 5. Upper sealing ring; 6. Pipe body; 601. Cable passage; 602. Positioning convex ring; 603. Stepped surface; 7. Inner sealing ring; 8. Sealing element skeleton; 801. First vertical positioning surface; 802. Upper conical surface; 803. First sealing positioning surface; 804. Second vertical positioning surface; 805. Lower conical surface; 806. Second sealing positioning surface; 9. Inner conical sealing ring; 10. Spacer ring; 11. Locking block; 12. Lower protective sleeve; 13. Lower sealing ring; 14. Lower anti-rotation pin; 15. Lower connector.

[0039] Hydraulic pipeline 100, small diameter multi-pipe plug seal 101, cohesive device 102, anchoring packer 201, working cylinder 202, sand control pipe column 203. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] Example 1:

[0042] Please see Figures 1 to 3This utility model provides a small-diameter multi-tube insert seal, including a tube body 6. A combined sealing element is provided on the outer wall of the tube body 6. The combined sealing element includes a sealing element skeleton 8. The upper outer wall of the sealing element skeleton 8 is provided with an upward-facing first conical sealing groove, and the lower outer wall of the sealing element skeleton 8 is provided with a downward-facing second conical sealing groove. An inner sealing groove is provided on the inner wall of the sealing element skeleton 8. An inner conical sealing ring 9 is provided in the first conical sealing groove and the second conical sealing groove, and an inner sealing ring 7 is provided in the inner sealing groove. The inner conical sealing ring 9 is used to seal with the inner wall of the working cylinder, and the inner sealing ring 7 is used to seal between the sealing element skeleton 8 and the tube body 6.

[0043] Furthermore, the first conical sealing groove includes a first vertical positioning surface 801, an upper conical surface 802, and a first sealing positioning surface 803. The first vertical positioning surface 801 extends vertically downward from the lower end of the sealing element skeleton 8, and the first sealing positioning surface 803 extends inward from the outer wall of the sealing element skeleton 8. The upper conical surface 802 faces upward and is connected to the lower end of the first vertical positioning surface 801 and the inner end of the first sealing positioning surface 803. The first sealing positioning surface 803 can mate with the end face of the inner conical sealing ring 9.

[0044] Furthermore, the second conical sealing groove includes a second vertical positioning surface 804, a lower conical surface 805, and a second sealing positioning surface 806. The second vertical positioning surface 804 extends vertically downward from the lower end of the sealing element skeleton 8, and the second sealing positioning surface 806 extends inward from the outer wall of the sealing element skeleton 8. The lower conical surface 805 faces downward and is connected to the lower end of the second vertical positioning surface 804 and the inner end of the second sealing positioning surface 806. The second sealing positioning surface 806 can mate with the end face of the inner conical sealing ring 9.

[0045] The conical surface faces the direction of the pressure, which can both ensure the sealing effect of the inner conical sealing ring 9 and prevent the inner conical sealing ring 9 from coming off.

[0046] Specifically, the outer wall of the inner conical sealing ring 9 is an arc surface and the inner wall is an inner conical surface. The upper and lower end faces of the inner conical sealing ring 9 are perpendicular to the inner conical surface. The first sealing positioning surface 803 is perpendicular to the upper conical surface 802, so that the first sealing positioning surface 803 can match the end face of the inner conical sealing ring 9. The second sealing positioning surface 806 is perpendicular to the lower conical surface 805, so that the second sealing positioning surface 806 can match the end face of the inner conical sealing ring 9.

[0047] Furthermore, a positioning protrusion ring 602 is provided on the outer wall of the pipe body 6. The lower end of the positioning protrusion ring 602 has an outer ring protrusion ring and an inner ring concave ring structure. The upper end of the sealing element skeleton 8 is inserted into the inner ring concave ring of the positioning protrusion ring 602, so that the outer ring protrusion ring of the positioning protrusion ring 602 abuts against the transition of the upper arc surface end face of the inner conical sealing ring 9 in the first conical sealing groove. The outer wall of the pipe body 6 is connected to a positioning ring. The upper end of the positioning ring has an outer ring protrusion ring and an inner ring concave ring structure. The lower end of the sealing element skeleton 8 is inserted into the inner ring concave ring of the positioning ring, so that the outer ring protrusion ring of the positioning ring abuts against the transition of the lower arc surface end face of the inner conical sealing ring 9 in the second conical sealing groove, thereby realizing the positioning and installation of the inner conical sealing ring 9 and making it difficult for the inner conical sealing ring 9 to fall out.

[0048] Specifically, the tube body 6 and the positioning protrusion ring 602 are integrally formed.

[0049] Furthermore, the upper inner wall of the tube body 6 is connected to the upper connector 1 by a thread and sealed by the upper sealing ring 5, and the lower inner wall of the tube body 6 is connected to the lower connector 15 by a thread and sealed by the lower sealing ring 13.

[0050] Specifically, the basic structure of the upper sealing ring 5, the inner sealing ring 7, the inner conical sealing ring 9, and the lower sealing ring 13 are all O-rings.

[0051] Example 2:

[0052] Based on Example 1, this example applies a small-diameter multi-tube insertion seal to injection and production wells.

[0053] A small-diameter multi-tube sealing device also includes a cable passage structure, which includes a cable passage channel 601. The cable passage channel 601 is an axial channel opened in the tube body 6. The cable passage channel 601 is provided with NPT connectors 3 at the upper end face and the lower end face of the tube body 6. The cable passage channel 601 is used for the passage of hydraulic lines. The NPT connectors 3 are used for docking with hydraulic lines. Unused NPT connectors 3 are provided with plugs.

[0054] It also includes a connector protection structure, which includes an upper protective sleeve 2 and a lower protective sleeve 12. The upper protective sleeve 2 is connected to the upper outer wall of the tube body 6 via an upper anti-rotation pin 4. An upper shielding ring is provided at the upper end of the upper protective sleeve 2, which contacts the outer wall of the upper connector 1. The upper shielding ring is provided with an upper wire-passing hole corresponding to the wire-passing channel 601. The lower protective sleeve 12 is connected to the lower outer wall of the tube body 6 via a lower anti-rotation pin 14. A lower shielding ring is provided on the lower inner wall of the lower end of the lower protective sleeve 12, which contacts the outer wall of the lower connector 15. The lower shielding ring is provided with a lower wire-passing hole corresponding to the wire-passing channel 601. The shielding ring protects the NPT connector 3.

[0055] The lower protective sleeve 12 has an outer convex ring at its upper end, and a positioning groove is provided on the outer wall of the tube body 6 in the area covered by the lower protective sleeve 12. A locking block 11 is provided in the positioning groove, and the locking block cooperates with the lower protective sleeve 12 to form an inner concave ring of the positioning ring.

[0056] In injection-production wells, the injected or produced fluid flows inside the small-diameter multi-tube plug-in seal tube 6. The layer is sealed by the interference fit between the combined sealing element and the working tube, achieving reliable and long-term stratification during injection or production. At the same time, the small-diameter multi-tube plug-in seal can achieve pipeline crossing through the built-in NPT joint 3. The crossed hydraulic pipeline is connected to the downhole tool on the lower side, and its operation can be achieved by surface pressure testing.

[0057] like Figure 4 As shown, taking single-tube layered polymer injection as an example, the working cylinder 202 and sand-proof pipe string 203 are first lowered into the designated position, and the anchor packer 201 is set and fixed. The small-diameter multi-tube insert 101 is assembled on the ground, and the polymerizer 102 and other tools are connected to its upper and lower parts. The hydraulic line 100 is connected to the NPT joint of the polymerizer 102 and other tools below through the NPT joint 3 and the cable passage 601 in the small-diameter multi-tube insert 101. The pipe string is lowered, and the small-diameter multi-tube insert 101 is inserted into the working cylinder 202 to complete the lowering of the single-tube layered polymer injection pipe string. The polymerizer 102 is controlled by the hydraulic line on the ground to complete the polymer injection.

[0058] It should be noted that the hydraulic pipeline 100, the cohesive device 102, the anchoring packer 201, the working cylinder 202, and the sand-proof pipe column 203 are all existing technologies, and those skilled in the art are clear about their structures, so they will not be described in detail.

[0059] Example 3:

[0060] Based on Example 2, this example provides at least two combined seals, with a spacer ring 10 between each pair of combined seals. The upper and lower ends of the spacer ring 10 are both outer ring convex rings and inner ring concave rings, which cooperate with the corresponding combined seals.

[0061] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0062] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0063] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0064] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A small-diameter multi-tube insert seal, comprising a tube body, wherein a combined sealing element is provided on the outer wall of the tube body, characterized in that, The combined seal includes a seal skeleton, the upper outer wall of the seal skeleton is provided with an upward-facing first conical sealing groove, the lower outer wall of the seal skeleton is provided with a downward-facing second conical sealing groove, and the inner wall of the seal skeleton is provided with an inner sealing groove. An inner conical sealing ring is provided in the first conical sealing groove and the second conical sealing groove, and an inner sealing ring is provided in the inner sealing groove.

2. The small-diameter multi-tube sealing method according to claim 1, characterized in that, The first conical sealing groove includes a first vertical positioning surface, an upper conical surface, and a first sealing positioning surface; The first vertical positioning surface extends vertically downward from the lower end of the sealing element frame; The first sealing positioning surface extends inward from the outer wall of the sealing element skeleton, and the first sealing positioning surface can match the end face of the inner conical sealing ring; The upper conical surface faces upward, and the upper conical surface is connected to the lower end of the first vertical positioning surface and the inner end of the first sealing positioning surface; The second conical sealing groove includes a second vertical positioning surface, a lower conical surface, and a second sealing positioning surface; The second vertical positioning surface extends vertically downward from the lower end of the sealing element frame; The second sealing positioning surface extends inward from the outer wall of the sealing element skeleton, and the second sealing positioning surface can match the end face of the inner conical sealing ring; The lower conical surface faces downwards, and the lower conical surface is connected to the lower end of the second vertical positioning surface and the inner end of the second sealing positioning surface.

3. A small-diameter multi-tube sealing method according to claim 2, characterized in that, The outer wall of the inner conical sealing ring is an arc surface, and the inner wall is an inner conical surface; The upper and lower end faces of the inner conical sealing ring are perpendicular to the inner conical surface, the first sealing positioning surface is perpendicular to the upper conical surface, and the second sealing positioning surface is perpendicular to the lower conical surface.

4. A small-diameter multi-tube sealing device according to claim 3, characterized in that, The outer wall of the tube is provided with a positioning protrusion ring. The lower end of the positioning protrusion ring is an outer ring protrusion ring and an inner ring concave ring structure. The upper end of the sealing element skeleton is inserted into the inner ring concave ring of the positioning protrusion ring, so that the outer ring protrusion ring of the positioning protrusion ring abuts against the transition of the upper arc surface end face of the inner conical sealing ring in the first conical sealing groove. The outer wall of the tube is connected to a positioning ring. The upper end of the positioning ring has an outer convex ring and an inner concave ring structure. The lower end of the sealing element skeleton is inserted into the inner concave ring of the positioning ring, so that the outer convex ring of the positioning ring abuts against the transition of the lower arc surface end face of the inner conical sealing ring in the second conical sealing groove.

5. A small-diameter multi-tube sealing device according to claim 4, characterized in that, The tube body and the positioning protrusion ring are integrally manufactured.

6. A small-diameter multi-tube sealing device according to claim 4, characterized in that, The upper end of the pipe is connected to an upper connector, and the lower end of the pipe is connected to a lower connector.

7. A small-diameter multi-tube sealing device according to claim 6, characterized in that, It also includes a cable passage structure, which includes a cable passage channel, which is an axial channel opened in the pipe body, and the cable passage channel is provided with connectors at the upper end face and the lower end face of the pipe body.

8. A small-diameter multi-tube sealing device according to claim 7, characterized in that, It also includes a connector protection structure, which includes an upper protective sleeve and a lower protective sleeve; The upper protective sleeve is connected to the upper outer wall of the tube body through an upper anti-rotation pin. The upper end of the upper protective sleeve is provided with an upper shielding ring that contacts the outer wall of the upper connector. The upper shielding ring is provided with an upper wire passage hole corresponding to the wire passage channel. The lower protective sleeve is connected to the lower outer wall of the tube body via a lower anti-rotation pin. The lower inner wall of the lower protective sleeve is provided with a lower shielding ring that contacts the outer wall of the lower connector. The lower shielding ring is provided with a lower wire passage hole corresponding to the wire passage channel.

9. A small-diameter multi-tube sealing device according to claim 8, characterized in that, The upper end of the lower protective sleeve is a convex outer ring of the positioning ring. The outer wall of the tube is provided with a positioning groove in the area covered by the lower protective sleeve. A locking block is provided in the positioning groove. The locking block cooperates with the lower protective sleeve to form a concave inner ring of the positioning ring.

10. A small-diameter multi-tube sealing device according to claim 4, characterized in that, At least two combined seals are provided, and a spacer ring is provided between each pair of combined seals. The upper and lower ends of the spacer ring are both outer ring convex rings and inner ring concave rings, which cooperate with the corresponding combined seals.

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