Oil pipe electric heating paraffin removal and blockage removal device and blockage removal process

Abstract

The invention belongs to the technical field of oil well oil pipe blockage, and discloses an oil pipe electric heating paraffin removal and blockage removal device and a blockage removal process. Comprising a cable, a crawling arm, a motor, a hollow rod, a telescopic doctor blade, a melting agent storage box, a rotating ring, a cavity heating body, a heating baffle, a heating rod, a telescopic supporting rod, a resistance wire, a steel pipe, a heat insulation layer, an insulating material and a heating head. Higher and more thorough plug removal efficiency is achieved, and the oil well exploitation benefits are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of oil well oil pipe blockage, and in particular relates to an oil pipe electric heating wax removal and blockage removal device and a blockage removal process. Background Art

[0002] In the process of crude oil extraction, although oil fields take anti-wax and wax removal measures for oil wells in daily maintenance and management projects, wax deposition in oil wells is still an inevitable problem. In the process of waxy crude oil extraction, the temperature of crude oil decreases due to the escape and expansion of molten gas. When the temperature is lower than the wax precipitation point, wax crystals will precipitate and continuously deposit in the formation, oil pipes, and downhole equipment. Wax deposition in the formation will reduce the formation permeability, reduce the crude oil recovery rate, and even block the oil production layer; wax deposition in the oil pipe will increase the viscosity of crude oil, increase resistance, reduce the production capacity of the oil well, increase operating costs, and even block the ground pipeline. At the same time, in the production well, due to the mixture of oil scale and paraffin in the pipe, the channel is narrowed, affecting daily oil production or testing work.

[0003] At present, the commonly used methods for wax removal and oil removal are mechanical wax removal and thermal wax removal. Mechanical wax scraping is simple and easy, and has low cost, but due to the small space at the bottom of the well and the limitations of mechanical equipment, it is often powerless to high hardness areas or locations where the oil pipe is blocked. And because of the high hardness of the deposited wax, the easily damaged scraper and the scraped wax blocks are easy to settle to the bottom of the wellbore, causing the problem of blocking the wellbore. Thermal wax removal is simple to operate and has a quick effect, but due to inaccurate judgment of the degree of wax deposition in the oil well, the determined hot washing cycle and hot washing parameters are unreasonable, resulting in poor oil well wax removal effect, low thermal efficiency, oil layer pollution and other problems. In actual production applications, only one of the above two methods is often used to remove wax, resulting in poor wax cleaning effect. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides an oil pipe electric heating wax cleaning and unblocking device and an unblocking process, which adopts a combination of mechanical oil wax cleaning and thermal oil wax cleaning to solve the problem of poor oil wax cleaning effect. The device can melt wax and clean oil wax simultaneously, which can effectively improve the efficiency of oil well wax cleaning, ensure the benefits of oil well exploitation, and also improve the success rate of related well logging.

[0005] The above-mentioned purpose of the present invention is achieved through the following technical scheme: an oil pipe electric heating wax removal and unblocking device, comprising a cable, a crawling arm, a motor, a hollow rod, a retractable scraper, a solvent storage box, a rotating ring, a cavity heating body, a heating baffle, a heating rod, a retractable support rod, a resistance wire, a steel pipe, an insulating layer, and a heating head; wherein the cable is connected to the hollow rod, and the hollow rod is provided with a crawling arm, a motor, a solvent storage box, a rotating ring, and a retractable support rod in sequence from top to bottom, a retractable scraper is provided on the rotating ring, a cavity heating body is provided at the bottom of the rotating ring, a heating baffle is installed at the bottom of the retractable support rod, the outer periphery of the heating baffle is connected to the cavity heating body, and a heating rod is provided at the bottom of the heating baffle.

[0006] Furthermore, the upper edge of the heating baffle is made of insulating material, and a resistance wire c is wound around the center.

[0007] Furthermore, the cavity heating body is made of insulating material, a resistance wire a is wrapped around the cavity heating body, a steel pipe is provided on the outer wall, an insulating layer is provided between the steel pipe and the cavity heating body, and a heating head a is installed at the bottom end of the cavity heating body.

[0008] Furthermore, the heating rod body is made of insulating material, a resistance wire b is wrapped around the heating rod body, and a heating head b is provided at the bottom end of the heating rod.

[0009] Furthermore, the insulating material used for the upper edge of the heating baffle, the cavity heating body main body, and the heating rod main body is talcum powder or silica.

[0010] Furthermore, the material of the resistance wire at the center of the heating baffle, on the main body of the cavity heating body, and on the main body of the heating rod is nickel-chromium electric heating alloy or iron-chromium-aluminum alloy.

[0011] Furthermore, the heat insulation layer material between the steel pipe and the cavity heating body is polyurethane.

[0012] Another object of the present invention is to protect the unblocking process of the above-mentioned oil pipe electric heating wax unblocking device, which comprises the following steps:

[0013] (1) Connect the device on the ground;

[0014] (2) Lower the oil pipe electric heating test device into the oil pipe;

[0015] (3) Lower the instrument to the blocked position, lift it up 5-10 meters, open the crawling arm and the retractable scraper, and spread the crawling arm and the retractable scraper to fit tightly against the inner wall of the pipe;

[0016] (4) The motor is turned on, the retractable scraper and the cavity heating body are heated and rotated, the retractable scraper scrapes the residual blockage on the inner wall of the tube, the cavity heating body rotates to unblock, and the crawling arm pushes the cavity heating body downward. If the thickness of the obstruction position is less than the height of the heating chamber, the instrument is slowly lowered to unblock by bottom rotation and heating. If the thickness of the obstruction position is greater than the height of the heating chamber, the viscosity of the blockage is small, and the electric heating rod is released to heat the oil wax and other substances in the heating chamber; if the viscosity of the blockage is large, the electric heating rod is released to heat the oil wax and other substances in the heating chamber, and other auxiliary agents such as the melting agent or viscosity reducer in the device are released; if the viscosity of the blockage is too large, auxiliary agents can be injected into the well while the device is lowered to assist in unblocking. The heating speed can be controlled according to the power supply current, and the waiting time can be set according to the situation. After the waiting time is over, the heating rod is retracted and the instrument is lifted up.

[0017] (5) Lower the instrument again and repeat step (4) until the blockage is successfully unblocked.

[0018] (6) Continue to lower the instrument for 5-10 meters, stop working, retract the crawling arm and the retractable rotating scraper, turn off the power and stop heating, and lift up to retract the instrument.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: a larger range of blockage removal can be achieved by utilizing a rotatable cavity heating body; if the effect is not good, a heating rod arranged in the cavity formed by the inner wall of the cavity heating body and the heating baffle can achieve concentrated local blockage removal; in addition, spraying a flux and a retractable scraper can be used to achieve faster and more thorough blockage removal efficiency, thereby ensuring the benefits of oil well exploitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Figure 1 It is a cross-sectional view of the oil pipe electric heating wax removal and blockage removal device of the present invention, with the crawling arm of the oil pipe being lowered into the oil pipe being opened;

[0022] Figure 2 It is a bottom view of the oil pipe electric heating wax removal and blockage removal device of the present invention, with the crawling arm of the oil pipe being lowered into the oil pipe opened;

[0023] Figure 3 It is a cross-sectional view of the oil pipe electric heating wax removal and blockage removal device of the present invention before the crawling arm is lowered into the oil pipe and closed;

[0024] Figure 4 It is a bottom view of the oil pipe electric heating wax removal and blockage removal device of the present invention before the oil pipe crawling arm is lowered into the oil pipe and closed;

[0025] Figure 5 The present invention discloses a process flow chart of the oil pipe electric heating wax removal and blockage removal device.

[0026] In the figure, 1. cable; 2. oil pipe; 3. crawling arm; 4. motor; 5. hollow rod; 6. retractable scraper; 7. flux storage box; 8. rotating ring; 9. cavity heating body; 10. heating baffle; 11. heating rod; 12. retractable support rod; 91. resistance wire a; 92. steel pipe; 93. insulation layer; 94. cavity heating body; 95. heating head a; 101. resistance wire c; 102. upper edge of heating baffle; 111. resistance wire b; 112. heating rod body; 113. heating head b. DETAILED DESCRIPTION

[0027] The present invention is described in detail below by specific examples, but the protection scope of the present invention is not limited. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.

[0028] like Figure 1 The figure shows a device for removing wax and unblocking by electric heating of oil pipes and a process schematic diagram of the present invention. The device mainly consists of a cable 1, an oil pipe 2, a crawling arm 3, a motor 4, a hollow rod 5, a retractable scraper 6, a flux storage box 7, a rotating ring 8, a cavity heating body 9, a heating baffle 10, a heating rod 11, and a retractable support rod 12; the cavity heating body 9 consists of a resistance wire a91, a steel pipe 92, a heat insulation layer 93, a cavity heating body main body 94, and a heating head a95; the heating baffle 10 consists of a resistance wire c101 and an upper edge 102 of the heating baffle; the heating rod 11 consists of a resistance wire b111, a heating rod main body 112, and an electric heating head b113. Among them, the steel pipe 92 adopts a high-pressure seamless alloy steel pipe that is resistant to high pressure and does not deform; the cavity heating body main body 94, the upper edge 102 of the heating baffle and the heating rod main body 112 are all made of crystalline magnesium oxide with thermal conductivity and insulation functions, which plays a sealing and protective role for the resistance wire a91, the resistance wire c101 and the resistance wire b111; the retractable scraper 6 is set to 4 pieces at 90° to each other, the scraper is set in an arc shape, and is made of stainless steel with a smooth surface, which does not wear the oil pipe and can be reused. The top of the rotating ring 8 is connected to the side wall of the retractable scraper, and the bottom is connected to the cavity heating body 9. The rotating ring 8 drives the retractable scraper 6 and the cavity heating body 9 to rotate, and the retractable scraper 6 rotates to achieve The residual blockage on the inner wall of the oil pipe is cleaned, and the cavity heating body 9 rotates to accelerate the melting process; the heating baffle 10 and the cavity heating body 9 form a cavity space. Since the outer wall of the cavity heating body 9 adopts the isolation layer 9.3 design, centralized heating is achieved in the space to reduce heat loss; the heating rod 11 adopts a resistance structure, but is not limited to this. A liquid heating tube can also be used, and its top end is connected to the telescopic support rod 12. The telescopic process of the heating rod 11 in the hollow rod 5 is realized by controlling the telescopic support rod 12; the heating head a95 is hemispherical, with a large effective area, suitable for unblocking in a larger range; the heating head b113 is conical, with a small effective area, suitable for rapid unblocking in a smaller range.

[0029] Example 1

[0030] (1) Connect the oil pipe electric heating test device and lower the device to the obstruction position (the position is wax or oil-wax mixture), lift the device up 5-10 meters, open the device crawling arm, fit it tightly against the inner wall of the pipe, support the device in the center, turn on the rotating retractable scraper, turn on the bottom electric heating, and lower the device.

[0031] (2) The thickness of the obstruction position is less than the height of the heating chamber. The lowering speed is set to 0.5 m / s. When the obstruction position is reached, the device is slowly lowered. The blockage can be unblocked by rotating the bottom and heating.

[0032] (3) After lowering the device for 5-10 meters, stop working, retract the crawling arm and the retractable rotating scraper, turn off the power and stop heating, and lift the recovery device.

[0033] Example 2

[0034] (1) Connect the oil pipe electric heating test device and lower the device to the obstruction position (the position is wax or oil-wax mixture), lift the device up 5-10 meters, open the device crawling arm, fit it tightly against the inner wall of the pipe, support the device in the center, turn on the rotating retractable scraper, turn on the bottom electric heating, and lower the device.

[0035] (2) When the thickness of the obstruction position is greater than the height of the heating chamber, the lowering speed is set to 0.5 m / s. When the obstruction position is reached, the device is slowly lowered. At this time, the bottom rotates and heats. When the second obstruction is reached after 5-10 minutes, the heat insulation baffle is opened to release the electric heating rod to heat the oil wax and other materials in the heating chamber. The heating speed can be controlled according to the power supply current. After about 10-15 minutes, the heating rod is retracted and the device is lifted up.

[0036] (3) Lower the device again and repeat step (2) until the blockage is successfully unblocked.

[0037] (4) After lowering the device for 5-10 meters, stop working, retract the crawling arm and the retractable rotating scraper, turn off the power and stop heating, and lift the recovery device.

[0038] Example 3

[0039] (1) Connect the oil pipe electric heating test, and lower the device to the obstruction position (the position is wax or oil-wax mixture), lift the device 5-10 meters, open the device crawling arm, fit it tightly against the inner wall of the pipe, support the device in the center, turn on the rotating retractable scraper, turn on the bottom electric heating, and lower the device.

[0040] (2) If the thickness of the obstruction position is greater than the height of the heating chamber and the viscosity is relatively high, set the lowering speed to 0.5m / s. When the obstruction position is reached, continue to slowly lower the device, rotate the bottom, heat and release the melting agent or viscosity reducer and other auxiliary agents in the device. When the second obstruction is reached 5-10 minutes later, open the heat insulation baffle, release the electric heating rod, and heat the oil wax and other materials in the heating chamber. The heating speed can be controlled according to the power supply current. After about 10-15 minutes, retract the heating rod and lift the device. (Note: If the viscosity is too high, you can also inject auxiliary agents into the well while lowering the device to help unblock it.)

[0041] (3) Lower the device again and repeat step (2) until the blockage is successfully unblocked.

[0042] (4) After lowering the device for 5-10 meters, stop working, retract the crawling arm and the retractable rotating scraper, turn off the power and stop heating, and lift the recovery device.

[0043] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. An oil pipe electric heating wax removal and unblocking device, characterized in that: The invention comprises a cable (1), a crawling arm (3), a motor (4), a hollow rod (5), a retractable scraper (6), a dissolving agent storage box (7), a rotating ring (8), a cavity heating body (9), a heating baffle (10), a heating rod (11), a retractable support rod (12), a resistance wire, a steel pipe (92), a heat insulating layer (93), and a heating head; wherein the cable (1) is connected to the hollow rod (5); the hollow rod (5) is provided with a crawling arm (3), a motor (4), a dissolving agent storage box (7), a rotating ring (8), and a retractable support rod (12) in sequence from top to bottom; the retractable scraper (6) is provided on the rotating ring (8); the cavity heating body (9) is provided at the bottom of the rotating ring (8); the bottom of the retractable support rod (12) is provided with a heating baffle (10); the outer periphery of the heating baffle (10) is connected to the cavity heating body (9); and the bottom of the heating baffle (10) is provided with a heating rod (11).

2. The oil pipe electric heating wax removal and unblocking device according to claim 1 is characterized in that: The upper edge (102) of the heating baffle is made of insulating material, and a resistance wire c (101) is wound around the center.

3. The oil pipe electric heating wax removal and unblocking device according to claim 1 is characterized in that: The cavity heating body (94) is made of insulating material, a resistance wire a (91) is wrapped around the cavity heating body (94), a steel pipe (92) is provided on the outer wall, a heat insulation layer (93) is provided between the steel pipe (92) and the cavity heating body (94), and a heating head a (95) is installed at the bottom end of the cavity heating body (9).

4. The oil pipe electric heating wax removal and blockage removal device according to claim 1, characterized in that: The heating rod body (112) is made of insulating material. A resistance wire b (111) is wrapped around the heating rod body (112). A heating head b (113) is provided at the bottom end of the heating rod (11).

5. The oil pipe electric heating wax removal and unblocking device according to any one of claims 2 to 4, characterized in that: The insulating material used for the upper edge (102) of the heating baffle, the cavity heating body (94) and the heating rod body (112) is talcum powder or silica.

6. The oil pipe electric heating wax removal and unblocking device according to any one of claims 2 to 4, characterized in that: The material of the resistance wire at the center of the heating baffle (10), on the main body (94) of the cavity heating body, and on the main body (112) of the heating rod is nickel-chromium electric heating alloy or iron-chromium-aluminum alloy.

7. The oil pipe electric heating wax removal and blockage removal device according to claim 3 is characterized in that: The material of the heat insulation layer (93) between the steel pipe (92) and the cavity heating body (94) is polyurethane.

8. The unblocking process of the oil pipe electric heating wax unblocking device according to claim 1, characterized in that: The steps include: S1. Connect the device on the ground; S2. Lower the oil pipe electric heating test device into the oil pipe; S3. Lower the device to the blocked position, lift the device 5-10 meters, open the crawling arm (3) and the retractable scraper (6), and open the crawling arm (3) and the retractable scraper (6) to fit closely with the inner wall of the tube; S4. The motor is turned on, the retractable scraper (6) and the cavity heating body (9) are heated and rotated, the retractable scraper (6) scrapes the residual blockage on the inner wall of the tube, the cavity heating body (9) rotates to unblock, and the crawling arm (3) pushes the cavity heating body (9) downward. If the thickness of the obstruction position is less than the height of the heating chamber, the instrument is slowly lowered to achieve unblocking through bottom rotation and heating; if the thickness of the obstruction position is greater than the height of the heating chamber, the viscosity of the blockage is relatively small, and the electric heating rod (11) is released to heat the oil wax and other substances in the heating chamber; if the viscosity of the blockage is relatively large, the electric heating rod (11) is released to heat the oil wax and other substances in the heating chamber, and other auxiliary agents such as the melting agent or viscosity reducer in the device are released; if the viscosity of the blockage is too large, auxiliary agents can be injected into the well while the device is lowered to assist in unblocking; the heating speed can be controlled according to the power supply current, and the waiting time can be set according to the situation. After the waiting time, the heating rod is retracted and the instrument is lifted up; S5. Lower the instrument again and repeat step S4 until the blockage is successfully unblocked; S6. Continue to lower the instrument for 5-10 meters, stop working, retract the crawling arm (3) and the retractable scraper (6), turn off the power and stop heating, and lift up to retract the instrument.

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