Petroleum underground continuous heating pipe cable device

Abstract

The invention relates to the technical field of petroleum exploitation equipment, and discloses a petroleum underground continuous heating pipe cable device which comprises a well mouth and a base, and a sealing heating assembly is arranged at the top of the well mouth. According to the petroleum underground continuous heating pipe cable device, when a wellhead is heated, a heating pipe cable device body connected with a sealing plate is hoisted to the top of the wellhead, and the sealing plate is clamped to the top of an annular baffle, so that a sealing ring gasket and a rubber sealing gasket are tightly attached to the top of a mounting plate and the top of the annular baffle; after a hydraulic rod is started to drive a top plate to be jacked to a certain height, a motor is started to drive a threaded rod to rotate and transmit, so that a movable plate moves up and down instead of rotating under the condition that a guide rod is arranged, and the movable plate is driven to be connected with two pressing blocks to be clamped to the top of a connecting column; at the moment, the movable plate stably presses the sealing plate to the top of the mounting plate, and finally the heating pipe cable device body is started to heat the wellhead.

Description

Technical Field

[0001] The invention relates to the technical field of oil production equipment, in particular to an underground oil well continuous heating pipe and cable device. Background Art

[0002] At present, the wellhead of oil wells often freezes, resulting in damage to the pipes and cables, work interruption, etc. Continuous heating pipes and cables are lowered into the production string, and the coiled tubing is turned into a heat carrier using the principle of electric heating. The fluid in the tubing and the coiled tubing increases the temperature of the wellbore fluid to a level higher than the wax precipitation temperature, thereby eliminating wax deposition. The system consists of an electric coiled tubing shearing device + hanger + ground temperature control system on the ground, and a continuous heating pipe and cable in the well. The entire system is automatically controlled by the ground power supply system, and the heating power is adjusted in time according to the change in wellbore temperature.

[0003] In the process of realizing this application, the inventor found that there are at least the following problems in this technology: most of the existing wellhead heating devices use discrete heating, which has poor effect and heat is easily dissipated from the wellhead during heating. Therefore, an oil well continuous heating cable device is proposed to solve the above problems. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides an underground continuous heating pipe and cable device for oil wells, which has the advantages of good heating effect of the heating pipe and cable during use, good sealing effect at the wellhead during use, and heat is not easy to dissipate, etc., which solves the problem that the existing oil wellhead heating device has poor heating effect and concentrated heat during heating, and ensures stable heating effect.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of good heating effect and good sealing effect at the wellhead during heating, the present invention provides the following technical solutions: a downhole continuous heating pipe and cable device for petroleum, comprising a wellhead and a base, wherein a sealing heating assembly is arranged on the top of the wellhead;

[0008] The sealing heating assembly includes a mounting plate, the bottom of which is fixedly connected to the top of the wellhead, the top of the mounting plate is fixedly connected to an annular baffle, the top of the annular baffle is detachably connected to a sealing plate, the interior of the sealing plate is fixedly connected to a heating pipe and cable device body, the top of the sealing plate is fixedly connected to two connecting columns, the top of the base is fixedly connected to two hydraulic rods, the movable ends of the two hydraulic rods are fixedly connected to the same top plate, the top of the top plate is fixedly connected to a motor, one end of the motor output shaft is fixedly connected to a threaded rod, the bottom of the top plate is fixedly connected to a guide rod, the outer surface of the threaded rod is threadedly connected to a movable plate, the bottom of the movable plate is fixedly connected to two clamping blocks, and the outer surfaces of the two clamping blocks are fixedly connected to a limiting assembly.

[0009] Preferably, the limit assembly includes two box bodies, springs are fixedly connected inside the two box bodies, movable blocks are fixedly connected to opposite sides of the two springs, and latch rods are fixedly connected inside the two movable blocks.

[0010] Preferably, a sliding groove is provided inside the two box bodies, and the two movable blocks slide inside the two box bodies through the sliding groove.

[0011] Preferably, a pull ring is fixedly connected to the separated side of the two latch rods, a latch rod hole is opened inside the two clamping blocks, the two latch rod holes pass through and extend to the inside of the two connecting columns, and the two latch rods are clamped with the two connecting columns through the latch rod holes.

[0012] Preferably, the mounting plate is in the shape of a circular plate with a circular through hole formed inside, the sealing plate is provided with an annular sealing groove inside, and the annular baffle is located inside the sealing plate through the annular sealing groove.

[0013] Preferably, a sealing gasket is fixedly connected to the inner wall of the annular sealing groove, and a rubber sealing pad is fixedly connected to the bottom of the sealing plate.

[0014] Preferably, a mounting frame is fixedly connected to the top of the top plate, the motor is fixedly connected to the top plate via the mounting frame, bolt holes are provided inside the top plate, and the top plate is fixedly connected to the movable ends of the two hydraulic rods via fastening bolts.

[0015] Preferably, a guide rod hole is provided inside the movable plate, and the guide rod is slidably connected to the movable plate through the guide rod hole. A threaded rod hole is provided inside the movable plate, and the threaded rod is located inside the movable plate through the threaded rod hole.

[0016] Preferably, the interiors of the two pressing blocks are provided with connecting column grooves, and the two pressing blocks are located on the outer surfaces of the two connecting columns through the connecting column grooves.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a device for continuously heating pipe and cable in oil wells, which has the following beneficial effects:

[0019] 1. The oil well continuous heating pipe and cable device, when the wellhead is being heated, the heating pipe and cable device body connected with the sealing plate is hoisted to the top of the wellhead, and the sealing plate is clamped to the top of the annular baffle, so that the sealing ring gasket and the rubber sealing gasket are closely fitted with the top of the mounting plate and the annular baffle. At this time, after the base is hoisted over, the hydraulic rod is started to drive the top plate to a certain height, and then the motor is started to drive the threaded rod to rotate and drive, so that the movable plate changes from rotating motion to up and down movement in the case of a guide rod, and drives the movable plate to connect the two clamping blocks to the top of the connecting column. At this time, the movable plate stably presses the sealing plate on the top of the mounting plate, and finally the heating pipe and cable device body is started to heat the wellhead.

[0020] 2. The oil well continuous heating pipe and cable device is provided with a limit assembly at the bottom of the movable plate, so that after the clamping block is clamped and limited with the two connecting columns, the two latch rods can be pulled under the action of the spring, and the two latch rods are clamped into the inside of the two connecting columns to limit the two clamping blocks and the connecting columns, thereby ensuring that looseness is avoided as much as possible during the subsequent heating process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a main cross-sectional view of the structure of a continuous heating pipe and cable device for oil wells proposed by the present invention;

[0022] Figure 2 This is a bottom view of a structural sealing plate of a petroleum downhole continuous heating pipe and cable device proposed by the present invention;

[0023] Figure 3 This is a top view of a movable plate and base of a structure of a continuous heating pipe and cable device for underground petroleum wells proposed by the present invention.

[0024] In the figure: 1 wellhead, 2 mounting plate, 3 annular baffle, 4 sealing plate, 5 annular sealing groove, 6 heating tube and cable device body, 7 connecting column, 8 base, 9 hydraulic rod, 10 top plate, 11 motor, 12 threaded rod, 13 guide rod, 14 movable plate, 15 clamping block, 16, 17 box body, 18 spring, 19 movable block, 20 latch rod. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-3 A continuous heating pipe and cable device for oil wells comprises a wellhead 1 and a base 8. A sealing heating component is arranged on the top of the wellhead 1.

[0027] The sealed heating assembly includes a mounting plate 2, the bottom of which is fixedly connected to the top of the wellhead 1, and the mounting plate 2 is in the shape of a circular plate with a circular through hole formed inside.

[0028] An annular baffle plate 3 is fixedly connected to the top of the mounting plate 2, a sealing plate 4 is detachably connected to the top of the annular baffle plate 3, a rubber sealing pad is fixedly connected to the bottom of the sealing plate 4, an annular sealing groove 5 is opened inside the sealing plate 4, a sealing gasket is fixedly connected to the inner wall of the annular sealing groove 5, and the annular baffle plate 3 is located inside the sealing plate 4 through the annular sealing groove 5.

[0029] The inside of the sealing plate 4 is fixedly connected to a heating tube and cable device body 6, the top of the sealing plate 4 is fixedly connected to two connecting columns 7, the top of the base 8 is fixedly connected to two hydraulic rods 9, the movable ends of the two hydraulic rods 9 are fixedly connected to the same top plate 10, the inside of the top plate 10 is provided with bolt holes, and the top plate 10 is fixedly connected to the movable ends of the two hydraulic rods 9 by fastening bolts.

[0030] A motor 11 is fixedly connected to the top of the top plate 10 , and a mounting frame is fixedly connected to the top of the top plate 10 . The motor 11 is fixedly connected to the top plate 10 via the mounting frame.

[0031] A threaded rod 12 is fixedly connected to one end of the output shaft of the motor 11, a guide rod 13 is fixedly connected to the bottom of the top plate 10, a movable plate 14 is threadedly connected to the outer surface of the threaded rod 12, a threaded rod hole is opened inside the movable plate 14, the threaded rod 12 is located inside the movable plate 14 through the threaded rod hole, a guide rod hole is opened inside the movable plate 14, and the guide rod 13 is slidably connected to the movable plate 14 through the guide rod hole.

[0032] Two pressing blocks 15 are fixedly connected to the bottom of the movable plate 14 . Connecting column grooves 16 are formed inside the two pressing blocks 15 . The two pressing blocks 15 are located on the outer surfaces of the two connecting columns 7 through the connecting column grooves 16 .

[0033] The outer surfaces of the two clamping blocks 15 are fixedly connected to the limiting components, which include two box bodies 17. The interiors of the two box bodies 17 are fixedly connected with springs 18. The opposite sides of the two springs 18 are fixedly connected with movable blocks 19. The interiors of the two box bodies 17 are provided with sliding grooves, and the two movable blocks 19 slide inside the two box bodies 17 through the sliding grooves.

[0034] Latch rods 20 are fixedly connected inside the two movable blocks 19, and pull rings are fixedly connected to the separated sides of the two latch rods 20. Latch rod holes are opened inside the two clamping blocks 15, and the two latch rod holes pass through and extend to the inside of the two connecting columns 7. The two latch rods 20 are clamped with the two connecting columns 7 through the latch rod holes.

[0035] By setting a limiting component at the bottom of the movable plate 14, after the clamping block 15 is clamped and limited with the two connecting columns 7, the two latch rods 20 can be pulled and, under the action of the spring 18, the two latch rods 20 are clamped into the inside of the two connecting columns 7, thereby limiting the two clamping blocks 15 and the connecting columns 7, thereby ensuring that looseness is avoided as much as possible during the subsequent heating process.

[0036] In this embodiment, the circular through hole inside the mounting plate 2 allows the heating cable device body 6 to penetrate the mounting plate 2 inside the wellhead 1 during heating, thereby ensuring a better sealing effect during the heating process.

[0037] In this embodiment, the hydraulic rod 9 is provided to adjust the working height of the top plate 10 and avoid obstructing the working height of the heating tube and cable device body 6 as much as possible, thereby affecting the operation of the heating device body. Therefore, the hydraulic rod 9 can be provided to adjust the distance between the top plate 10 and the base 8.

[0038] It should be noted that the heating tube and cable device body 6 includes a wellhead heater, a temperature controller and a power supply system. The wellhead heater is installed near the wellhead and is used to heat the wellhead area. The temperature controller is connected to the wellhead heater and is used to monitor the temperature of the wellhead and control the output power of the power supply system. The power supply system is connected to the wellhead heater and the temperature controller and is used to input electrical energy into the wellhead heater.

[0039] The wellhead heater comprises a heating element and a housing, wherein the heating element comprises a plurality of heating resistors arranged in the housing. The housing has good insulation performance to prevent power leakage and the influence of the external environment on the heating element.

[0040] The temperature controller includes a temperature sensor and a control circuit. The temperature sensor is used to measure the temperature of the wellhead and transmit the measurement results to the control circuit. The control circuit adjusts the output power of the power supply system according to the measurement results to keep the wellhead temperature within the set range.

[0041] The power supply system includes a power supply and a power regulator. The power supply is used to provide stable electric energy to the power regulator. The power regulator receives the control signal of the temperature controller and adjusts the output power according to the control signal to meet the heating requirements of the wellhead heater.

[0042] Preparation work before going down the well: 1. After the continuous heating pipe and cable are delivered to the site, they shall be inspected and checked according to the contents of the first-level inspection checklist to ensure that the tools are intact and usable and that all parameters are consistent with the design.

[0043] 2 After the inspection is completed, place the continuous heating pipe and cable in a suitable position to avoid exposure to the sun and bumps, etc., to ensure that it is ready to enter the well at any time.

[0044] Lowering the continuous heating pipe and cable string: 1. Open the wax removal valve at the wellhead, and after confirmation on the ground, lower the continuous heating pipe and cable at a speed of 1-3m / min, paying attention to the change of the hanging weight, and controlling the change of the hanging weight within 0.5t; 2. Lower the pipe and cable through the wellhead at a controlled speed, and observe whether there is any hanging phenomenon. During the operation, always observe the change of the wellhead pressure and the hanging weight. Control the speed to be less than 10m / min and lower it to 1500m. The depth of the continuous heating pipe and cable can be adjusted according to the actual situation; 3. Perform a pull test every 300m to ensure normal construction.

[0045] The working principle of the above embodiment is:

[0046] The oil well continuous heating pipe and cable device, when the wellhead 1 is being heated, the heating pipe and cable device body 6 connected with the sealing plate 4 is hoisted to the top of the wellhead 1, and the sealing plate 4 is clamped to the top of the annular baffle 3, so that the sealing ring gasket and the rubber sealing gasket are closely fitted with the top of the mounting plate 2 and the annular baffle 3. At this time, after the base 8 is hoisted over, the hydraulic rod 9 is started to drive the top plate 10 to be lifted to a certain height, and then the motor 11 is started to drive the threaded rod 12 to rotate and drive, so that the movable plate 14 changes from rotating motion to moving up and down in the case of the guide rod 13, and drives the movable plate 14 to connect the two pressing blocks 15 to be clamped to the top of the connecting column 7. At this time, the movable plate 14 stably presses the sealing plate 4 on the top of the mounting plate 2, and finally the heating pipe and cable device body 6 is started to heat the wellhead 1.

[0047] It should be noted that the standard parts used in the application can be purchased from the market, special-shaped parts can be customized according to the description in the specification and drawings, and the specific connection methods of each part adopt mature bolts, rivets, welding, etc. in the existing technology. Conventional means, machinery, parts and equipment all adopt conventional models in the existing technology; plus the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field.

[0048] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A continuous heating pipe and cable device for oil wells, comprising a wellhead (1) and a base (8), characterized in that: A sealing heating component is provided at the top of the wellhead (1); The sealing heating assembly comprises a mounting plate (2), the bottom of the mounting plate (2) is fixedly connected to the top of the wellhead (1), the top of the mounting plate (2) is fixedly connected to an annular baffle (3), the top of the annular baffle (3) is detachably connected to a sealing plate (4), the interior of the sealing plate (4) is fixedly connected to a heating pipe and cable device body (6), the top of the sealing plate (4) is fixedly connected to two connecting columns (7), the top of the base (8) is fixedly connected to two hydraulic rods (9), and the two hydraulic rods (9) are fixedly connected to the bottom of the base (8). The movable end of the rod (9) is fixedly connected to the same top plate (10), the top of the top plate (10) is fixedly connected to a motor (11), one end of the output shaft of the motor (11) is fixedly connected to a threaded rod (12), the bottom of the top plate (10) is fixedly connected to a guide rod (13), the outer surface of the threaded rod (12) is threadedly connected to a movable plate (14), the bottom of the movable plate (14) is fixedly connected to two clamping blocks (15), and the outer surfaces of the two clamping blocks (15) are fixedly connected to a limiting assembly.

2. The oil well continuous heating cable device according to claim 1, characterized in that: The limit assembly comprises two box bodies (17), the interiors of the two box bodies (17) are fixedly connected with springs (18), the opposite sides of the two springs (18) are fixedly connected with movable blocks (19), and the interiors of the two movable blocks (19) are fixedly connected with latch rods (20).

3. The oil well continuous heating cable device according to claim 2, characterized in that: The two box bodies (17) are both provided with sliding grooves inside, and the two movable blocks (19) slide inside the two box bodies (17) through the sliding grooves.

4. The oil well continuous heating cable device according to claim 2, characterized in that: A pull ring is fixedly connected to the separated sides of the two latch rods (20), and latch rod holes are opened inside the two clamping blocks (15). The two latch rod holes penetrate and extend to the inside of the two connecting columns (7), and the two latch rods (20) are clamped with the two connecting columns (7) through the latch rod holes.

5. The oil well continuous heating cable device according to claim 1, characterized in that: The mounting plate (2) is in the shape of a circular plate with a circular through hole formed inside. The sealing plate (4) is provided with an annular sealing groove (5) inside. The annular baffle (3) is located inside the sealing plate (4) through the annular sealing groove (5).

6. The oil well continuous heating cable device according to claim 5, characterized in that: A sealing gasket is fixedly connected to the inner wall of the annular sealing groove (5), and a rubber sealing pad is fixedly connected to the bottom of the sealing plate (4).

7. The oil well continuous heating cable device according to claim 1, characterized in that: A mounting frame is fixedly connected to the top of the top plate (10), and the motor (11) is fixedly connected to the top plate (10) via the mounting frame. Bolt holes are provided inside the top plate (10), and the top plate (10) is fixedly connected to the movable ends of the two hydraulic rods (9) via fastening bolts.

8. The oil well continuous heating cable device according to claim 1, characterized in that: A guide rod hole is provided inside the movable plate (14), and the guide rod (13) is slidably connected to the movable plate (14) through the guide rod hole. A threaded rod hole is provided inside the movable plate (14), and the threaded rod (12) is located inside the movable plate (14) through the threaded rod hole.

9. The oil well continuous heating cable device according to claim 1, characterized in that: The two pressing blocks (15) are each provided with a connecting column groove (16) inside, and the two pressing blocks (15) are each located on the outer surface of the two connecting columns (7) through the connecting column groove (16).

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