Paraffin removal and control annulus joint pipe for oil well shaft

Abstract

The utility model relates to an oil well shaft paraffin removal and control annulus joint pipe which comprises an annulus joint pipe body located in an oil sleeve annulus. The top end of the annulus joint pipe is connected with a lifting device; a heating device surrounds the outer side wall of the annulus joint pipe; a paraffin scraping device surrounds the inner side wall located at the bottom end of the annulus joint pipe, a paraffin removing device surrounds the inner side wall located in the middle of the annulus joint pipe, and a repairing device surrounds the inner side wall located at the top end of the annulus joint pipe. The device further comprises a power supply system which is connected with the lifting device and the heating device. The annulus joint pipe is lowered to the paraffin precipitation position through the lifting device, the temperature of the paraffin precipitation position of a shaft is increased through the heating cable, meanwhile, the paraffin scraping device cleans wax samples on the outer wall of the oil pipe, the paraffin removing device is used for brushing off the residual wax samples on the outer wall of the oil pipe after the wax scraping device treats the wax samples, and then the outer wall of the oil pipe is repaired through the repairing device. The whole paraffin removal process is completed underground, and the annulus joint pipe is pulled out at a constant speed through the lifting device after the paraffin removal work is finished.

Description

Technical Field

[0001] This utility model relates to the field of oil wellbore dewaxing, specifically to a dewaxing device for oil wells that causes wax buildup in the wellbore and blockage in the tubing during oil well production. Background Technology

[0002] During crude oil production, as the crude oil is transported to the surface, the temperature and pressure gradually decrease. The wax dissolved in the crude oil will precipitate in the form of crystals and be adsorbed onto the walls of the tubing, casing, and other oil production equipment. In severe cases, it may even block the tubing, increase the load on the well, and cause production accidents. This invention allows for wax removal and prevention operations in the tubing within the wellbore. Summary of the Invention

[0003] This utility model aims to address the above-mentioned problems by proposing a dewaxing and anti-waxing annulus joint pipe for oil wells.

[0004] The technical solution of this utility model is as follows:

[0005] An annular section for cleaning and preventing wax buildup in an oil wellbore includes an annular section located in the annulus of the casing; a lifting device is connected to the top of the annular section; a heating device is surrounded on the outer wall of the annular section; a wax scraping device is surrounded on the inner wall at the bottom of the annular section; a wax removal device is surrounded on the inner wall at the middle of the annular section; and a repair device is surrounded on the inner wall at the top of the annular section; it also includes a power supply system connected to the lifting device and the heating device respectively.

[0006] The wax removal device is a first brush, and the repair device is a second brush, which is coated with a self-healing coating.

[0007] The hoisting device includes a movable plate and a driving device for driving the movable plate. The movable plate is fixed above the wellhead, and the driving device is connected to the power supply system. The top end of the annular section pipe is symmetrically provided with fixing bolts, and the movable plate has through holes corresponding to the fixing bolts. It also includes a connecting rope. The connecting rope extends from the fixing bolts out of the holes and connects to the driving device.

[0008] The power supply system and drive device are both located on the movable plate.

[0009] The end of the wax scraping device that contacts the wax sample is provided with a silicone layer.

[0010] The driving device is a lifting motor.

[0011] The heating device is a heating cable.

[0012] The technical advantages of this utility model are as follows:

[0013] This invention uses a lifting device to lower the annular section to the wax-contaminated location. A heating cable raises the temperature of the wax-contaminated area in the wellbore, while a wax scraping device cleans the wax from the outer wall of the tubing. A wax removal device then brushes away any remaining wax from the outer wall of the tubing after the scraping device has finished. Finally, a repair device repairs the outer wall of the tubing. The entire wax removal process is completed downhole. After the wax removal is finished, the annular section is pulled out at a constant speed using the lifting device. Attached Figure Description

[0014] Figure 1 This utility model relates to an annular joint pipe for cleaning and preventing waxing in oil well casings.

[0015] Reference numerals in the attached drawings: 1. Annular tube; 2. Moving plate; 3. Lifting motor; 4. Connecting rope; 6. Fixing plate; 7. Fixing bolt; 8. Heating cable; 9. Second brush; 10. First brush; 11. Wax scraping device; 12. Silicone layer. Detailed Implementation

[0016] Example 1

[0017] An annular section for cleaning and preventing wax buildup in an oil wellbore includes an annular section 1 located in the annulus of the casing; a lifting device is connected to the top of the annular section 1; a heating device surrounds the outer wall of the annular section 1; a wax scraping device 11 surrounds the inner wall at the bottom of the annular section 1; a wax removal device surrounds the inner wall at the middle of the annular section 1; and a repair device surrounds the inner wall at the top of the annular section 1; a power supply system is also included, which is connected to the lifting device and the heating device respectively.

[0018] The specific implementation process of this embodiment is as follows:

[0019] This invention uses a lifting device to lower the annular section 1 to the wax-contaminated location. The power supply system is turned on, and the temperature of the wax-contaminated part of the wellbore is raised by controlling the heating cable 8. The annular section 1 is heated, which dissolves the wax on the inner and outer walls of the tubing. The annular section 1 is lowered at a constant speed by the lifting device. The wax scraping device 11 first cleans the wax on the outer wall of the tubing. The wax removal device is used to brush off the wax remaining on the outer wall of the tubing after the wax scraping device 11 has been used. Then, the repair device is used for repair. After the wax removal work is completed, the annular section 1 is pulled out at a constant speed by the lifting device.

[0020] Example 2

[0021] Based on Example 1, the method further includes: the wax removal device is a first brush 10, used to brush off the wax residue remaining on the outer wall of the oil pipe after treatment by the wax scraping device 11; the repair device is a second brush 9, which is coated with a layer of oleophobic and hydrophobic self-healing coating, which is evenly applied to the outer wall of the oil pipe to prevent the adsorption of wax.

[0022] Example 3

[0023] Based on Embodiment 2, the lifting device further includes a movable plate 2 and a driving device for driving the movable plate 2. The movable plate 2 is mounted above the wellhead, and the driving device is connected to the power supply system. The top end of the annular section pipe 1 is symmetrically provided with fixing bolts 7, and the movable plate 2 has through holes corresponding to the fixing bolts 7. The device also includes a connecting rope 4. The connecting rope 4 extends from the fixing bolts 7 through the holes and connects to the driving device. When the power supply system provides power, the driving device controls the annular section pipe 1 to move up and down by controlling the connecting rope 4.

[0024] Example 4

[0025] Based on Embodiment 3, the power supply system and drive device are both located on the moving plate 2. A silicone layer 12 is provided at the end of the wax scraping device 11 that contacts the wax sample. The drive device is a lifting motor 3. The heating device is a heating cable 8.

Claims

1. A wellbore dewaxing and anti-wax annulus joint, comprising an annulus joint (1) located in the annulus of the casing; characterized in that: The top end of the annular tube (1) is connected to a lifting device; the outer wall of the annular tube (1) is surrounded by a heating device; the inner wall at the bottom end of the annular tube (1) is surrounded by a wax scraping device (11); the inner wall at the middle of the annular tube (1) is surrounded by a wax cleaning device; and the inner wall at the top end of the annular tube (1) is surrounded by a repair device; a power supply system is also included, which is connected to the lifting device and the heating device respectively.

2. The oil wellbore dewaxing and anti-wax annulus joint pipe according to claim 1, characterized in that: The wax removal device is a first brush (10), and the repair device is a second brush (9), which is coated with a self-healing coating.

3. The oil wellbore dewaxing and anti-wax annulus joint pipe according to claim 1, characterized in that: The lifting device includes a movable plate (2) and a driving device for driving the movable plate (2). The movable plate (2) is mounted above the wellhead, and the driving device is connected to the power supply system. The top end of the annular section pipe (1) is symmetrically provided with fixing bolts (7), and the movable plate (2) is provided with through holes corresponding to the fixing bolts (7). It also includes a connecting rope (4). The connecting rope (4) extends from the fixing bolts (7) out of the hole and connects to the driving device.

4. The oil wellbore dewaxing and anti-wax annulus joint pipe according to claim 3, characterized in that: The power supply system and drive device are both located on the movable plate (2).

5. The oil wellbore dewaxing and anti-wax annulus joint pipe according to claim 4, characterized in that: The movable plate (2) is also provided with a fixing plate (6) for fixing the power supply system and drive device.

6. The oil wellbore dewaxing and anti-wax annulus joint pipe according to claim 5, characterized in that: The wax scraping device (11) has a silicone layer (12) at the end that contacts the wax sample.

7. The oil wellbore dewaxing and anti-wax annulus joint pipe according to claim 6, characterized in that: The driving device is a lifting motor (3).

8. The oil wellbore dewaxing and anti-wax annulus joint pipe according to claim 7, characterized in that: The heating device is a heating cable (8).

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