Internal cable protection device for cable passing packer

Abstract

The invention belongs to the technical field of oilfield development, and particularly relates to an internal cable protection device for a cable passing packer, which comprises a protection pipe, a connecting pipe is arranged at the bottom end of the protection pipe, the connecting pipe is connected to the top end of the cable passing packer, a cable is arranged in the protection pipe in a penetrating manner, and a lining pipe is arranged between the inner wall of the connecting pipe and the cable. The lower part of the protection pipe is provided with a guide piece, the top end of the protection pipe is connected with a pressing pipe, the pressing pipe abuts against the top end of the lining pipe, and the bottom end of the lining pipe extrudes and seals the cable under the action of the guide piece. The cable protection device is arranged at the top end of the cable passing packer, the cable penetrates out of the non-armored section of the cable passing packer and penetrates into the protection pipe, the lining pipe is arranged between the protection pipe and the cable, the lining pipe is extruded through the pressing pipe, the cable is extruded and sealed by the bottom end of the lining pipe under the action of the guiding piece, and the cable passing packer is protected. Therefore, the cable is protected, and a gas-liquid mixture discharged by the exhaust valve is prevented from impacting an unarmored part of the cable.

Description

Technical Field

[0001] The present invention belongs to the technical field of oilfield development, and particularly relates to an internal cable protection device for a cable-through packer. Background Art

[0002] In the completion operation of a submersible electric pump, the cable-through packer is lowered into the well along with the tubing. The function of the cable-through packer is to separate the bottom-hole pressure, effectively seal the production layer or the construction target layer, and prevent the mutual interference of the liquid and pressure between layers.

[0003] A cylindrical exhaust valve is provided on the cable-through packer. When the gas pressure below the cable-through packer is too high, the exhaust valve can be automatically opened to discharge the gas into the oil-casing annulus above the cable-through packer, releasing the bottom-hole pressure. The gas-liquid mixture discharged through the exhaust valve is at high temperature, high pressure and has strong corrosiveness.

[0004] When the power cable of the submersible electric pump unit passes through the cable-through packer, in order not to damage the overall sealing performance of the cable-through packer, an integral penetration method is adopted. During the construction of the power cable penetration, it is necessary to strip the protective armor on the outer layer of the cable, resulting in no armored protection on the outer layer of a section of the cable after it passes through the cable-through packer.

[0005] Due to the limitation of the inner diameter size of the wellbore, the exhaust valve installed outside the cable-through packer is very close to the position of the cable penetration cylinder. The high-temperature, high-pressure and strongly corrosive gas-liquid mixture discharged through the exhaust valve will directly impact the section of the power cable without armor on the outer layer. During the operation of the submersible electric pump, it will cause damage to the insulation layer of the power cable, reduction of electrical performance, until the insulation layer is punctured, resulting in single-phase grounding or interphase short circuit, causing the electric pump well to shut down and unable to produce normally. It can only resume normal production after replacing the damaged cable by reworking. When the submersible electric pump well cannot produce normally, its oil production rate is greatly reduced, and high operation costs and the cost of the electric pump cable have to be paid, causing huge economic losses to the oil production enterprise.

[0006] Therefore, an internal cable protection device for a cable-through packer is proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide an internal cable protection device for a cable-through packer to solve the above problems.

[0008] To achieve the above purpose, the present invention provides the following solutions:

[0009] An internal cable protection device for a cable sealer comprises: a protection tube, a connecting tube is arranged at the bottom end of the protection tube, the connecting tube is connected to the top end of the cable sealer, the cable is passed through the protection tube, an inner lining tube is arranged between the inner wall of the connecting tube and the cable, a guide is arranged at the bottom of the protection tube, a compression tube is connected to the top end of the protection tube, the compression tube abuts against the top end of the inner lining tube, and the bottom end of the inner lining tube squeezes and seals the cable under the action of the guide.

[0010] In the internal cable protection device for passing through a cable sealer of the present invention, the guide member includes a guide ring, which is arranged in the protection tube and located at the lower part of the protection tube, and a first slope is circumferentially opened on the inner wall of the guide ring, and the first slope is located at the top of the guide ring, and a second slope is opened on the outer wall of the inner liner tube, and the second slope is located at the bottom end of the inner liner tube, and the second slope is matched with the first slope, and the bottom end of the inner liner tube extends into the guide ring.

[0011] In the internal cable protection device for passing through a cable sealer of the present invention, a mounting groove is circumferentially opened on the inner wall of the bottom end of the protection tube, the guide ring is coaxially arranged in the mounting groove, and the top end of the guide ring abuts against the bottom of the mounting groove.

[0012] In the internal cable protection device for a cable gland of the present invention, the connecting tube includes a first threaded section, the first threaded section is threadedly connected in the mounting groove, the first threaded section abuts against the bottom end of the guide ring, a second threaded section is coaxially arranged below the first threaded section, the second threaded section is threadedly connected to the top end of the cable gland, the first threaded section and the second threaded section are fixedly connected by a limiting section, and the limiting section abuts against the bottom end of the protection tube and the top end of the cable gland.

[0013] In the internal cable protection device for passing through a cable sealer of the present invention, the compression tube includes a third threaded section, the third threaded section is threadedly connected to the top end of the protection tube, the bottom end of the third threaded section is coaxially fixed with an avoidance section, the outer diameter of the avoidance section is smaller than the outer diameter of the third threaded section, the avoidance section abuts against the top end of the inner liner tube, and the top end of the third threaded section extends out of the protection tube and is coaxially fixed with a force-bearing section.

[0014] In the internal cable protection device for passing through a cable packer of the present invention, a thread groove is circumferentially opened on the inner side wall of the protection tube, and the bottom end of the thread groove is connected to an injection mechanism.

[0015] In the internal cable protection device for a cable passing packer of the present invention, the injection mechanism includes an injection channel opened in the wall of the protection tube. The bottom end of the injection channel communicates with the bottom end of the thread groove, and the top end of the injection channel penetrates through the protection tube.

[0016] In the internal cable protection device for a cable passing packer of the present invention, an external threaded tube is provided at the top end of the injection channel. A first injection hole and a second injection hole are coaxially opened in the external threaded tube. The diameter of the first injection hole is smaller than that of the second injection hole. The first injection hole is located above the second injection hole. A sphere is arranged in the second injection hole. The diameter of the sphere is larger than that of the first injection hole and smaller than that of the second injection hole. The top end of a spring is fixedly connected to the sphere, and the bottom end of the spring abuts against a limiting ring. The limiting ring is threadedly connected to the bottom end of the second injection hole.

[0017] In the internal cable protection device for a cable passing packer of the present invention, an internal threaded tube is fixedly connected to the top end inner wall of the injection channel. The lower part of the external threaded tube is threadedly connected in the internal threaded tube.

[0018] In the internal cable protection device for a cable passing packer of the present invention, a limiting ring is circumferentially and fixedly connected to the outer side wall of the external threaded tube. The limiting ring abuts against the top end of the protection tube.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] The cable protection device of the present invention is arranged at the top end of the cable passing packer. The cable passes through the non-armored section of the cable passing packer and penetrates into the protection tube. A lining tube is arranged between the protection tube and the cable. The lining tube is extruded by the pressing tube. The bottom end of the lining tube extrudes and seals the cable under the action of the guiding member, thereby realizing the protection of the cable and preventing the gas-liquid mixture discharged by the exhaust valve from impacting the non-armored part of the cable.

[0021] The present invention can effectively avoid the gas-liquid mixture discharged by the exhaust valve from impacting the non-armored part of the cable, realize the protection of the cable, and extend the service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts:

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 For Figure 1 Partial enlarged view at position A in

[0025] Figure 3 For Figure 1 Partial enlarged view at position B in

[0026] Figure 4 Schematic structural view of the connecting pipe in the present invention;

[0027] Figure 5 Schematic structural view of the pressing pipe in the present invention;

[0028] Wherein, 1, protective pipe; 2, thread groove; 3, inner lining pipe; 4, connecting pipe; 5, guiding ring; 6, injection channel; 7, installation groove; 8, first slope; 9, second slope; 10, pressing pipe; 11, internal thread pipe; 12, external thread pipe; 13, limiting ring; 14, first injection hole; 15, second injection hole; 16, sphere; 17, limiting ring; 18, spring; 401, first thread section; 402, second thread section; 403, limiting section; 1001, stress section; 1002, third thread section; 1003, avoidance section. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Referring to Figures 1 to 5 , the present invention discloses an internal cable protection device for a cable passing packer, including: a protective pipe 1, a connecting pipe 4 is arranged at the bottom end of the protective pipe 1, the connecting pipe 4 is connected to the top end of the cable passing packer, a cable is arranged inside the protective pipe 1, an inner lining pipe 3 is arranged between the inner wall of the connecting pipe 4 and the cable, a guiding member is arranged at the lower part of the protective pipe 1, a pressing pipe 10 is connected to the top end of the protective pipe 1, the pressing pipe 10 abuts against the top end of the inner lining pipe 3, and the bottom end of the inner lining pipe 3 squeezes and seals the cable under the action of the guiding member.

[0032] The cable protection device of the present invention is arranged at the top of the cable sealer. The cable passes through the unarmored section of the cable sealer and enters the protection tube 1. An inner liner tube 3 is arranged between the protection tube 1 and the cable. The inner liner tube 3 is squeezed by the compression tube 10. The bottom end of the inner liner tube 3 squeezes and seals the cable under the action of the guide member, thereby protecting the cable and preventing the gas-liquid mixture discharged from the exhaust valve from impacting the unarmored part of the cable.

[0033] The present invention can effectively prevent the gas-liquid mixture discharged from the exhaust valve from impacting the unarmored part of the cable, thereby protecting the cable and extending the service life of the cable.

[0034] In a feasible solution, the guide member includes a guide ring 5, which is arranged in the protective tube 1 and located at the lower part of the protective tube 1. A first slope 8 is circumferentially opened on the inner wall of the guide ring 5, and the first slope 8 is located at the top of the guide ring 5. A second slope 9 is opened on the outer wall of the liner tube 3, and the second slope 9 is located at the bottom end of the liner tube 3. The second slope 9 is matched with the first slope 8, and the bottom end of the liner tube 3 extends into the guide ring 5.

[0035] The bottom end of the inner liner tube 3 penetrates into the guide ring 5, and the first slope 8 is matched with the second slope 9. When the compression tube 10 squeezes the inner liner tube 3, the bottom end of the inner liner tube 3 squeezes the cable under the action of the first slope 8 to form a seal.

[0036] In a feasible solution, a mounting groove 7 is circumferentially opened on the inner side wall of the bottom end of the protection tube 1 , and the guide ring 5 is coaxially arranged in the mounting groove 7 , and the top end of the guide ring 5 abuts against the bottom of the mounting groove 7 .

[0037] In a feasible solution, the connecting pipe 4 includes a first threaded section 401, which is threadedly connected in the mounting groove 7, and abuts against the bottom end of the guide ring 5. A second threaded section 402 is coaxially arranged below the first threaded section 401, and the second threaded section 402 is threadedly connected to the top of the cable sealer. The first threaded section 401 and the second threaded section 402 are fixedly connected by a limiting section 403, and the limiting section 403 abuts against the bottom end of the protective tube 1 and the top end of the cable sealer.

[0038] In a feasible solution, the compression tube 10 includes a third threaded segment 1002, which is threadedly connected to the top of the protective tube 1, and the bottom end of the third threaded segment 1002 is coaxially fixed with an avoidance segment 1003, the outer diameter of the avoidance segment 1003 is smaller than the outer diameter of the third threaded segment 1002, the avoidance segment 1003 abuts against the top of the lining tube 3, and the top of the third threaded segment 1002 extends out of the protective tube 1 and is coaxially fixed with the force-bearing segment 1001.

[0039] The outer edge of the force-bearing section 1001 is set to be a regular hexagon and is compatible with a wrench for easy twisting.

[0040] In a feasible solution, a thread groove 2 is circumferentially formed on the inner side wall of the protection tube 1, and an injection mechanism is communicated with the bottom end of the thread groove 2.

[0041] In a feasible solution, the injection mechanism includes an injection channel 6 formed in the wall of the protection tube 1. The bottom end of the injection channel 6 is communicated with the bottom end of the thread groove 2, and the top end of the injection channel 6 penetrates through the protection tube 1.

[0042] In a feasible solution, an external thread tube 12 is arranged at the top end of the injection channel 6. A first injection hole 14 and a second injection hole 15 are coaxially formed in the external thread tube 12. The diameter of the first injection hole 14 is smaller than that of the second injection hole 15. The first injection hole 14 is located above the second injection hole 15. A sphere 16 is arranged in the second injection hole 15. The diameter of the sphere 16 is larger than that of the first injection hole 14, and the diameter of the sphere 16 is smaller than that of the second injection hole 15. The top end of a spring 18 is fixedly connected to the sphere 16, and the bottom end of the spring 18 abuts against a limiting ring 17. The limiting ring 17 is threadedly connected to the bottom end of the second injection hole 15.

[0043] When injecting glue, the top end of the external thread tube 12 is connected to a glue injection device. The glue presses down the sphere 16, and the glue enters the injection channel 6 through the gap between the sphere 16 and the second injection hole 15 and then enters the thread groove 2. After the glue injection is completed, the spring 18 pushes up the sphere 16, and the sphere 16 blocks the first injection hole 14 to prevent the glue from flowing back.

[0044] In a feasible solution, an internal thread tube 11 is fixedly connected to the top end inner wall of the injection channel 6, and the lower part of the external thread tube 12 is threadedly connected in the internal thread tube 11.

[0045] It is convenient to connect the external thread tube 12 to the injection channel 6.

[0046] In a feasible solution, a limiting ring 13 is circumferentially and fixedly connected to the outer side wall of the external thread tube 12, and the limiting ring 13 abuts against the top end of the protection tube 1.

[0047] The limiting ring 13 plays a limiting role to prevent the external thread tube 12 from being screwed too far.

[0048] Installation steps:

[0049] First, place the guiding ring 5 into the installation groove 7, and the first slope 8 on the guiding ring 5 faces the end of the protection tube 1 away from the installation groove 7. Then, threadedly connect the first thread section 401 of the connecting pipe 4 into the installation groove 7. At this time, the first thread section 401 presses and fixes the guiding ring 5, and the limiting section 403 abuts against the bottom end of the protection tube 1. Connect the second thread section 402 of the connecting pipe 4 to the cable packer, and the limiting section 403 abuts against the top end of the cable packer. The connection between the protection tube 1 and the cable packer is completed;

[0050] Insert the cable through the bottom end of the cable packer, and let it pass out from the top end of the cable packer and then enter the protection tube 1. The cable passes out of the protection tube 1. Insert the inner lining tube 3 into the protection tube 1 and sleeve it outside the cable. Then screw the compression tube 10 into the top end of the protection tube 1. Connect the glue injection device to the top end of the external thread tube 12, inject glue into the thread groove 2, and let the air escape through the gap between the threads of the compression tube 10 and the protection tube 1. After the glue overflows from the top end of the compression tube 10, the compression tube 10 presses the inner lining tube 3, and at the same time squeezes the glue, so that the inner lining tube 3 fits more closely to the cable, further enhancing the sealing performance.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention.

[0052] The embodiments described above are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An internal cable protection device for a cable packer, characterized in that: include: A protective tube (1), wherein a connecting tube (4) is provided at the bottom end of the protective tube (1), wherein the connecting tube (4) is connected to the top end of a cable sealer, wherein the cable is passed through the protective tube (1), wherein an inner lining tube (3) is provided between the inner wall of the connecting tube (4) and the cable, wherein a guide member is provided at the bottom of the protective tube (1), wherein a compression tube (10) is connected to the top end of the protective tube (1), wherein the compression tube (10) is in contact with the top end of the inner lining tube (3), and wherein the bottom end of the inner lining tube (3) extrude and seals the cable under the action of the guide member.

2. An internal cable protection device for a cable packer according to claim 1, characterized in that: The guide member comprises a guide ring (5), the guide ring (5) is arranged in the protective tube (1) and is located at the lower part of the protective tube (1), a first slope (8) is circumferentially opened on the inner wall of the guide ring (5), the first slope (8) is located at the top of the guide ring (5), a second slope (9) is opened on the outer wall of the inner liner tube (3), the second slope (9) is located at the bottom end of the inner liner tube (3), the second slope (9) is matched with the first slope (8), and the bottom end of the inner liner tube (3) extends into the guide ring (5).

3. An internal cable protection device for passing through a cable packer according to claim 2, characterized in that: A mounting groove (7) is circumferentially provided on the inner side wall of the bottom end of the protection tube (1), the guide ring (5) is coaxially arranged in the mounting groove (7), and the top end of the guide ring (5) abuts against the bottom of the mounting groove (7).

4. An internal cable protection device for passing through a cable packer according to claim 3, characterized in that: The connecting pipe (4) comprises a first threaded section (401), the first threaded section (401) is threadedly connected in the installation groove (7), the first threaded section (401) is abutted against the bottom end of the guide ring (5), a second threaded section (402) is coaxially arranged below the first threaded section (401), the second threaded section (402) is threadedly connected to the top end of the cable packer, the first threaded section (401) and the second threaded section (402) are fixedly connected via a limiting section (403), and the limiting section (403) is abutted against the bottom end of the protective pipe (1) and the top end of the cable packer.

5. The internal cable protection device for passing through a cable packer according to claim 1, characterized in that: The compression tube (10) includes a third threaded section (1002), which is threadedly connected to the top end of the protective tube (1), and the bottom end of the third threaded section (1002) is coaxially fixed with an avoidance section (1003), the outer diameter of the avoidance section (1003) is smaller than the outer diameter of the third threaded section (1002), the avoidance section (1003) is abutted against the top end of the liner tube (3), and the top end of the third threaded section (1002) extends out of the protective tube (1) and is coaxially fixed with a force-bearing section (1001).

6. The internal cable protection device for passing through a cable packer according to claim 1, characterized in that: A thread groove (2) is circumferentially formed on the inner side wall of the protection tube (1), and the bottom end of the thread groove (2) is connected to an injection mechanism.

7. An internal cable protection device for passing through a cable packer according to claim 6, characterized in that: The injection mechanism comprises an injection channel (6) opened in the wall of the protective tube (1), the bottom end of the injection channel (6) is connected to the bottom end of the thread groove (2), and the top end of the injection channel (6) passes through the protective tube (1).

8. An internal cable protection device for passing through a cable packer according to claim 7, characterized in that: An externally threaded tube (12) is provided at the top end of the injection channel (6), a first injection hole (14) and a second injection hole (15) are coaxially provided in the externally threaded tube (12), the diameter of the first injection hole (14) is smaller than the diameter of the second injection hole (15), the first injection hole (14) is located above the second injection hole (15), a sphere (16) is provided in the second injection hole (15), the diameter of the sphere (16) is larger than the diameter of the first injection hole (14), the diameter of the sphere (16) is smaller than the diameter of the second injection hole (15), the top end of a spring (18) is fixedly connected to the sphere (16), the bottom end of the spring (18) abuts against a limiting ring (17), and the limiting ring (17) is threadedly connected to the bottom end of the second injection hole (15).

9. An internal cable protection device for passing through a cable packer according to claim 8, characterized in that: An internally threaded tube (11) is fixedly connected to the top of the inner wall of the injection channel (6), and the lower part of the externally threaded tube (12) is threadedly connected inside the internally threaded tube (11).

10. An internal cable protection device for passing through a cable packer according to claim 8, characterized in that: A limiting ring (13) is circumferentially fixedly connected to the outer wall of the externally threaded tube (12), and the limiting ring (13) abuts against the top end of the protective tube (1).

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