Submersible Electric Heating Cable Packer Crossing Device

Abstract

The present invention relates to a device for a submersible heating cable to penetrate through a packer, characterized in that: one end of the packer plug is connected to the packer, and the other end is provided with a groove for placing a sealing component and is connected to the sheath through threads; a deep hole is provided inside the large-diameter variable section of the sheath, and a PTFE sealing gasket, a compression sleeve, and a split locking ring are sequentially arranged in the deep hole; the sheath is connected to the sheath plug through threads; the non-metallic-sheathed heating cable is connected to the cable connector and the heating cable is connected to the fixed cable connector both by crimping; the fixed cable connector after crimping is connected to the copper pipe of the docking head through a set screw; deep holes are respectively provided at both ends of the copper pipe of the docking head, grooves are provided inside the deep holes, and crown springs are placed in the grooves. The design of the present invention is scientific and reasonable, which can solve the problems of low sealing performance and poor reliability of the heating cable penetrating through the packer in existing heavy oil thermal recovery wells, and the device has a compact structure and simple operation, and can realize the rapid penetration of the packer.

Description

Technical Field

[0001] The present invention belongs to a packer cable crossing device for offshore oilfields, and relates to a submersible heating cable packer crossing device. Background Art

[0002] During the thermal recovery of heavy oil in offshore oilfields, the submersible heating cable is responsible for providing energy to the downhole heating device. When there is a packer downhole, the heating cable needs to cross the packer. Due to the limited annulus space and the large number of downhole tools crossing the packer, the submersible heating cable packer crossing device not only needs to consider that its function meets the actual use requirements of offshore oilfields, but also puts forward strict requirements for the shape of the crossing device.

[0003] For production wells equipped with packers, there is currently no submersible heating cable crossing device with excellent sealing performance and high reliability. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a submersible heating cable packer crossing device, which can solve the problems of low sealing performance and poor reliability of the heating cable crossing the packer in existing heavy oil thermal recovery wells, and the device has a compact structure, simple operation, and can achieve rapid crossing of the packer.

[0005] The present invention solves its technical problems through the following technical solutions:

[0006] A submersible heating cable packer crossing device is used to complete the butt joint of the non-steel sheath heating cable and the heating cable inside it. The submersible heating cable packer crossing device is threadedly connected to the packer. Its characteristics are as follows: it includes a packer plug, a sealing component, a sheath, a tetrafluoroethylene sealing gasket, a compression sleeve, a split locking ring, a sheath plug, a cable connector, a crown spring, a butt joint copper tube, a set screw, and a set screw cable connector. One end of the packer plug is threadedly connected to the packer through a sealing thread, and the other end is provided with a groove. The sealing component is placed in the groove. The packer plug is threadedly connected to the sheath. A deep hole is provided inside the large end of the variable diameter of the sheath. The tetrafluoroethylene sealing gasket, the compression sleeve, and the split locking ring are sequentially arranged inside the deep hole. The tetrafluoroethylene sealing gasket and the compression sleeve are in interference fit to form a sealing unit; the sheath is threadedly connected to the sheath plug. The non-steel sheath heating cable is connected to the cable connector by crimping, and the heating cable is connected to the set screw cable connector by crimping; the set screw cable connector is connected to the butt joint copper tube by a set screw; deep holes are respectively provided at both ends of the butt joint copper tube, and grooves are provided inside the deep holes, and the crown spring is placed in the grooves.

[0007] Moreover, the crown spring is in an overall thin-walled circular ring structure, and the middle part is processed into a grid structure and recessed towards the central axis.

[0008] Moreover, the number of the crown springs is two.

[0009] Moreover, one end of the split locking ring is arranged in a conical shape, and a plurality of grooves are arranged on the inner wall.

[0010] Moreover, silver plating layers are arranged on the surfaces of the butt joint copper pipe, the cable connector, the set screw, the fixed cable connector and the crown spring.

[0011] The advantages and beneficial effects of the present invention are as follows:

[0012] The submersible oil heating cable packer crossing device of the present invention can effectively solve the problem of the heating cable crossing the packer in the heavy oil thermal recovery well in the offshore oilfield, and the device has a compact structure, occupies a small space; is convenient to operate, effectively shortens the operation time, improves the production efficiency and reduces the production cost. Description of the Drawings

[0013] Figure 1 is the installation and use drawing of the present invention;

[0014] Figure 2 is the structural drawing of the heating cable of the present invention;

[0015] Figure 3 is the internal structural drawing of the present invention;

[0016] Figure 4 is the structural drawing of the crown spring of the present invention;

[0017] Figure 5 is the structural drawing of the split locking ring of the present invention.

[0018] Description of the Reference Numerals

[0019] 1. Steel-free sheathed heating cable, 2. Packer, 3. Submersible oil heating cable packer crossing device, 4. Heating cable, 3-1. Packer plug, 3-2. Sealing assembly, 3-3. Sheath, 3-4. Teflon sealing gasket, 3-5. Compression sleeve, 3-6. Split locking ring, 3-7. Sheath plug, 3-8. Cable connector, 3-9. Crown spring, 3-10. Butt joint copper pipe, 3-11. Set screw, 3-12. Fixed cable connector, 4-1. Steel sheath, 4-2. Rubber insulating layer, 4-3. Conductive copper core. Detailed Embodiment

[0020] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited thereby.

[0021] Please refer to Figure 1 , Figure 2, due to the space limitation of the packer 2, the aperture of the through-hole reserved for the heating cable 4 is small. Therefore, the heating cable 1 without a steel sheath is arranged below the packer to reduce its outer diameter and facilitate passing through. The heating cable 4 above the packer has a conventional structure. The heating cable 1 without a steel sheath and the heating cable 4 are butt-jointed inside the submersible heating cable packer passing device 3 to achieve energy transfer. The submersible heating cable packer passing device 3 is threadedly connected to the packer 2.

[0022] Please refer to Figure 2 , before the offshore operation starts, a section of the steel sheath layer 4-1 and the rubber insulation layer 4-2 of the heating cable 4 above the packer are successively removed to expose the conductive copper core 4-3 of the required length. A similar treatment is done to the heating cable 1 without a steel sheath layer below the packer.

[0023] Please refer to Figure 3 , the technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a submersible heating cable packer passing device for heavy oil thermal recovery wells in offshore oilfields, including a packer plug 3-1, a sealing assembly 3-2, a sheath 3-3, a tetrafluoroethylene sealing gasket 3-4, a compression sleeve 3-5, a split locking ring 3-6, a sheath plug 3-7, a cable connector 3-8, a crown spring 3-9, a butt-joint copper tube 3-10, a set screw 3-11 and a set cable connector 3-12.

[0024] One end of the packer plug 3-1 is threadedly connected to the packer 2 through a sealing thread, and the other end is provided with a groove. The sealing assembly 3-2 is placed in the groove and is threadedly connected to the sheath 3-3; a deep hole is provided inside the large-diameter end of the variable diameter of the sheath 3-3, and a tetrafluoroethylene sealing gasket 3-4, a compression sleeve 3-5, and a split locking ring 3-6 are successively arranged inside the deep hole; the tetrafluoroethylene sealing gasket 3-4 and the compression sleeve 3-5 are in interference fit to form a sealing unit; the sheath 3-3 is threadedly connected to the sheath plug 3-7. The heating cable 1 without a steel sheath is connected to the cable connector 3-8 by crimping, and the heating cable 4 is also connected to the set cable connector 3-12 by crimping; the set cable connector 3-12 is connected to the butt-joint copper tube 3-10 by the set screw 3-11; deep holes are respectively provided at both ends of the butt-joint copper tube 3-10, and grooves are provided inside the deep holes, and the crown spring 3-9 is placed in the grooves.

[0025] Please refer to Figure 4 , the crown spring 3-9 is integrally in the form of a thin-walled circular ring structure, and the middle part is processed into a grid structure and recessed towards the central axis.

[0026] Please refer to Figure 5 , one end of the split locking ring 3-6 is set to be conical, and multiple grooves are provided on the inner wall.

[0027] The specific implementation scheme of the present invention is as follows:

[0028] During on-site operations in an offshore oilfield, first, the steel-free sheathed heating cable 1 is passed upward from below the packer 2. Then, the packer plug 3-1 for placing the seal assembly 3-2 is sleeved onto the steel-free sheathed heating cable 1 from above the packer 2 and threadedly connected to the packer 2. The sheath plug 3-7, compression sleeve 3-5, PTFE sealing gasket 3-4, and sheath 3-3 are successively sleeved onto the submersible heating cable 4. The conductive copper core 4-3 at the end of the steel-free sheathed heating cable 1 is inserted into the cable connector 3-8 and firmly connected by crimping. The conductive copper core 4-3 at the end of the heating cable 4 is inserted into the set screw cable connector 3-12 and firmly connected by crimping. One end of the docking head copper tube 3-10 with an internal crown spring 3-9 is connected to the set screw cable connector 3-12 by plugging, and the two are firmly connected by a set screw 3-11. The cable connector 3-8 is inserted into the hole on the other side of the docking head copper tube 3-10 to complete the connection. The sheath 3-3 is threadedly connected to the packer plug 3-1. The compression sleeve 3-5 with the PTFE sealing gasket 3-4 installed and the split locking ring 3-6 are successively placed into the hole at the end of the sheath 3-3 along the heating cable 4. Finally, the sheath plug 3-7 is threadedly connected to the sheath 3-3.

[0029] Although embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art can understand that various substitutions, changes, and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the content disclosed in the embodiments and drawings.

Claims

1. A submersible oil heating cable packer crossing device is used to complete the butt joint of the heating cable (1) without a steel sheath and the heating cable (4) inside it. The submersible oil heating cable packer crossing device (3) is threadedly connected to the packer (2), and is characterized in that: It includes a packer plug (3-1), a sealing component (3-2), a sheath (3-3), a PTFE sealing gasket (3-4), a compression sleeve (3-5), a split locking ring (3-6), a sheath plug (3-7), a cable connector (3-8), a crown spring (3-9), a butt joint copper tube (3-10), a set screw (3-11) and a set screw cable connector (3-12). One end of the packer plug (3-1) is connected to the packer (2) through a sealing thread, and the other end is provided with a groove, in which the sealing component (3-2) is placed. The packer plug (3-1) is connected to the sheath (3-3) through a thread. A deep hole is provided inside the large-diameter variable-diameter end of the sheath (3-3), and the PTFE sealing gasket (3-4), the compression sleeve (3-5) and the split locking ring (3-6) are sequentially arranged inside the deep hole. The PTFE sealing gasket (3-4) and the compression sleeve (3-5) are in interference fit to form a sealing unit; the sheath (3-3) is connected to the sheath plug (3-7) through a thread. The steel-free sheath heating cable (1) is connected to the cable connector (3-8) by crimping, and the heating cable (4) is connected to the set screw cable connector (3-12) by crimping; the set screw cable connector (3-12) is connected to the butt joint copper tube (3-10) through the set screw (3-11); deep holes are respectively provided at both ends of the butt joint copper tube (3-10), and grooves are provided inside the deep holes, and the crown spring (3-9) is placed in the grooves; The crown spring (3-9) is integrally in the structure of a thin-walled circular ring, and the middle part is processed into a grid structure and recessed towards the central axis; The number of the crown springs (3-9) is two; One end of the split locking ring (3-6) is set to be conical, and multiple grooves are provided on the inner wall; Silver plating layers are provided on the surfaces of the butt joint copper tube (3-10), the cable connector (3-8), the set screw (3-11), the set screw cable connector (3-12) and the crown spring (3-9); During on-site operation in an offshore oilfield, first, the steel-free sheath heating cable is passed upward from below the packer, and then the packer plug with the sealing component is sleeved onto the steel-free sheath heating cable from above the packer and thread-connected to the packer.

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