Oil-rich coal in-situ pyrolysis well wall decontamination device

Abstract

The utility model discloses an oil-rich coal in-situ pyrolysis well wall decontamination device, which relates to the field of geological exploration and development and comprises a ground support system, an in-well auxiliary support mechanism and automatic control equipment. The in-well auxiliary supporting mechanism comprises a dirt separator rod, a power assisting cylinder, a connecting point, an upper supporting rod, a scraping plate, a lower supporting rod, a heater and a scraping and brushing cylinder, the dirt separator rod is arranged at the bottom of the derrick, the power assisting cylinder and the scraping and brushing cylinder are arranged outside the dirt separator rod, and a cable and a water pipe of the heater are both arranged in the dirt separator rod; the scraping and brushing cylinder is located below the power assisting cylinder, a plurality of upper supporting rods are arranged outside the power assisting cylinder, the dirt removing device solves the problem that oil dirt is attached to the wall in a mechanical dirt removing mode, no pickling agent is added, no new pollution is added, water vapor is sprayed to the two sides of the scraping plate through vapor spraying openings, the oil dirt on the well wall is activated, the fluidity of the oil dirt is improved, and the removing difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of geological exploration and development, specifically a device for cleaning the well wall of oil-rich coal in-situ pyrolysis. Background Technology

[0002] Well wall decontamination typically refers to methods used to remove contaminants from the well wall. Common contaminants include dust and oil stains, in order to keep the well wall clean and prevent further contamination. Well wall decontamination methods include water flushing to remove sludge, using a pump to jet clean water at high speed from the nozzle of a hose to impact and float the sludge, and then using another pump to pump the sludge out of the well. For oil wells with scale and oil stains, scraping is used to remove the scale. For wells with slight scale, the key is to increase the step size of the outer diameter.

[0003] In-situ pyrolysis mining of rich oil-bearing coal is a novel low-carbon coal development method. Drilling-based in-situ pyrolysis involves drilling a well on the surface to inject heat into the coal seam, achieving coal seam pyrolysis. The pyrolysis gas and tar are then extracted to the surface through the well. However, in in-situ pyrolysis mining, as the wellbore temperature gradually decreases, the tar and mixed gas change state, becoming more viscous and exhibiting significant tar adhesion to the wellbore, which is detrimental to tar removal. The contaminants on the wellbore in in-situ pyrolysis of rich oil-bearing coal are mainly ultrafine coal powder and heavy oil. Due to the relatively uniform environment of the pyrolysis furnace, acid washing operations are not suitable within the wellbore. Furthermore, traditional scrapers are of fixed size and need to be raised to the wellhead for replacement each time. Utility Model Content

[0004] The purpose of this invention is to provide a device for cleaning the well wall of oil-rich coal in-situ pyrolysis wells, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A wellbore cleaning device for in-situ pyrolysis of oil-rich coal includes a ground support system, an in-well auxiliary support mechanism, and automatic control equipment. The ground support system is a derrick, which is installed on the ground above the well. The in-well auxiliary support mechanism includes a cleaner rod, an assist cylinder, a connection point, an upper support rod, a scraper, a lower support rod, a heater, and a scraper cylinder. The cleaner rod is located at the bottom of the derrick, and the assist cylinder and scraper cylinder are located outside the cleaner rod. The cables and water pipes of the heater are located inside the cleaner rod. The scraper cylinder is located below the assist cylinder, and multiple upper support rods are located outside the assist cylinder. Multiple lower support rods are located outside the scraper cylinder. The bottom ends of the upper support rods are connected to the lower support rods. The scraper cylinder is connected to the scraper through the lower support rods. The scraper includes a scraper steel plate and a scraper flexible material.

[0007] The assist cylinder is divided into upper and lower double-layer structures. The lower layer of the assist cylinder houses the heater and heated water, while the upper layer is a storage space for water vapor. The lower support rod is made of hollow material and can deliver water vapor to the scraper. The scraper steel plate has a square structure, and steam injection ports for spraying water vapor are provided on both sides of the scraper steel plate.

[0008] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0009] In one alternative: the upper support rod and the auxiliary cylinder, and the lower support rod and the upper support rod are all provided with connection points; a water pipe is provided inside the dirt separator rod; one end of the water pipe extends out of the dirt separator rod; and the other end of the water pipe is connected to the heater.

[0010] In one alternative: the upper support rods consist of eight rods evenly distributed around the outside of the booster cylinder.

[0011] In one alternative: a support valve is provided on the outside of the scraper rod, the support valve being used to adjust the outer diameter of the scraper.

[0012] In one alternative: the automatic control device is an automatic controller, which is used to control the constant temperature heating and the propulsion of the support valve.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. The oil-rich coal in-situ pyrolysis well wall cleaning device uses a mechanical cleaning method to solve the problem of oil stains adhering to the wall. It does not add acid washing agents and does not add new pollution to the pyrolysis process. Water vapor is sprayed through steam nozzles on both sides of the scraper to activate the oil stains on the well wall, improve the fluidity of the oil stains, and reduce the difficulty of cleaning.

[0015] 2. The method for adjusting the scraper step length has been improved. The scraper is designed with a structure that combines flexible material and steel plate, which makes it easy to retract the scraper during use, reduce the outer diameter of the scraper, and adapt to different working conditions, thereby improving work efficiency. Attached Figure Description

[0016] Figure 1 A schematic diagram of a well wall cleaning device for in-situ pyrolysis of oil-rich coal.

[0017] Figure 2 This is a cross-sectional view of the scraper in the well wall cleaning device for in-situ pyrolysis of oil-rich coal.

[0018] Figure 3 This is a cross-sectional view of the scraper steel plate in the in-situ pyrolysis well wall cleaning device for oil-rich coal.

[0019] Figure 4 A schematic diagram of the steam injection port in the in-situ pyrolysis well wall cleaning device for oil-rich coal.

[0020] Figure label annotations: 1-Derrick, 2-Derrick wall, 3-Scrubber rod, 4-Assist cylinder, 5-Connection point, 6-Support valve, 7-Upper support rod, 8-Scraper, 9-Lower support rod, 10-Heater, 11-Scraper cylinder, 12-Water pipe, 13-Scraper flexible material, 14-Scraper steel plate, 15-Steam nozzle, 16-Automatic controller. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. In the drawings and description, similar or identical parts are referred to by the same reference numerals, and in practical applications, the shape, thickness, or height of each component may be enlarged or reduced. The embodiments listed in this utility model are merely illustrative and not intended to limit the scope of this utility model. Any obvious modifications or changes made to this utility model do not depart from its spirit and scope.

[0022] In one embodiment, such as Figure 1-4 As shown, a decontamination device for in-situ pyrolysis wellbore of rich oil and coal includes a ground support system, an in-well auxiliary support mechanism, and automatic control equipment. The ground support system is a derrick 1, which serves as the lower equipment support for the decontamination device. The derrick 1 is installed on the ground above the well. The in-well auxiliary support mechanism includes a decontaminator rod 3, an assist cylinder 4, a connection point 5, an upper support rod 7, a scraper 8, a lower support rod 9, a heater 10, and a scraper cylinder 11. The decontaminator rod 3 is located at the bottom of the derrick 1, and the assist cylinder 4 and the scraper cylinder 11 are located outside the decontaminator rod 3. The scraper cylinder 11 is used to connect the assist cylinder. The water vapor and scraper 8 in 4, the cable and water pipe of the heater 10 are all installed inside the cleaner rod 3, the scraper cylinder 11 is located below the assist cylinder 4, the assist cylinder 4 is provided with multiple upper support rods 7 outside, the scraper cylinder 11 is provided with multiple lower support rods 9 outside, the bottom end of the upper support rod 7 is connected to the lower support rod 9, the scraper cylinder 11 is connected to the scraper 8 through the lower support rod 9, the scraper 8 includes a scraper steel plate 14 and a scraper flexible material 13, the scraper flexible material 13 is a mesh or chain material, and the part of the scraper 8 that contacts the well wall 2 is made into a cone or arc shape;

[0023] The assist cylinder 4 is divided into upper and lower double-layer structures. The lower layer of the assist cylinder 4 houses the heater and heated water, while the upper layer of the assist cylinder 4 is a storage space for water vapor. The lower support rod 9 is made of hollow material and can deliver water vapor to the scraper 8. The scraper steel plate 14 has a square structure, and both sides of the scraper steel plate 14 are provided with steam injection nozzles 15 for spraying water vapor.

[0024] The in-situ pyrolysis well wall cleaning device for rich oil and coal comprises three components: a surface support system, an in-well auxiliary support mechanism, and an automatic control device. The main product of the in-situ pyrolysis oil recovery process for rich oil and coal is coal tar. Due to the large differences in coal tar composition and the presence of pyrolysis microparticles, it is easily condensed on the well wall during the drainage process, affecting the drainage efficiency of pyrolysis oil and gas. When the cleaning device is in use, pushing the upper support rod 7 causes the lower support rod 9 to open, allowing multiple scraper steel plates 14 to extend to the well wall position. The water injection device and heater 10 are then turned on, and steam is sprayed onto the well wall from the steam nozzle 15, improving the mobility of the oil sludge. The cleaning device is pushed from top to bottom or bottom to top to remove the oil sludge from the well wall. As an example, the left, right, up, and down positions of the various components shown in the attached drawings are only one arrangement method, and the specific positions are set according to specific needs.

[0025] In one embodiment, such as Figure 1 As shown, connection points 5 are provided at the connection positions of the upper support rod 7 and the assist cylinder 4, and the lower support rod 9 and the upper support rod 7. A water pipe 12 is provided inside the dirt separator rod 3. One end of the water pipe 12 extends out of the dirt separator rod 3, and the other end of the water pipe 12 is connected to the heater 10.

[0026] In one embodiment, such as Figure 1-2 As shown, there are eight upper support rods 7, which are evenly distributed around the outside of the booster cylinder 4.

[0027] In one embodiment, such as Figure 1-2 As shown, a support valve 6 is provided on the outside of the dirt remover rod 3. The support valve 6 can be set with 2-3 positions. The support valve 6 is used to adjust the outer diameter of the scraper 8.

[0028] In one embodiment, such as Figure 1 As shown, the automatic control device is an automatic controller 16, which is used to control the constant temperature heating and the advancement of the support valve 6.

[0029] The above embodiments of this utility model provide a decontamination device for in-situ pyrolysis well walls of oil-rich coal. The decontaminator rod 3 is lowered, the pipeline is connected, the upper support rod 7 is pushed forward and the scraper 8 is opened, the automatic controller 16 is started to inject water and heat, and the decontaminator is spirally pushed forward to complete the decontamination of the well wall. When the well wall is deformed, the upper support rod 7 is appropriately adjusted to the position of the upper support valve 6 to reduce the outer diameter of the decontaminator scraper and continue to push forward. When the decontamination work is completed, the upper support rod 7 is adjusted to the position of the highest support valve 6, the decontaminator is lifted out of the ground, cleaned and stored.

[0030] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A wellbore cleaning device for in-situ pyrolysis of oil-rich coal, comprising a surface support system, an in-well auxiliary support mechanism, and automatic control equipment, characterized in that, The ground support system is a derrick, which is set on the ground above the well. The auxiliary support mechanism in the well includes a scavenger rod, an assist cylinder, a connection point, an upper support rod, a scraper, a lower support rod, a heater, and a scraper cylinder. The scavenger rod is set at the bottom of the derrick. The assist cylinder and the scraper cylinder are set outside the scavenger rod. The cable and water pipe of the heater are set inside the scavenger rod. The scraper cylinder is located below the assist cylinder. Multiple upper support rods are set outside the assist cylinder. Multiple lower support rods are set outside the scraper cylinder. The bottom end of the upper support rod is connected to the lower support rod. The scraper cylinder is connected to the scraper through the lower support rod. The scraper includes a scraper steel plate and a scraper flexible material. The assist cylinder is divided into upper and lower double-layer structures. The lower layer of the assist cylinder houses the heater and heated water, while the upper layer is a storage space for water vapor. The lower support rod is made of hollow material and can deliver water vapor to the scraper. The scraper steel plate has a square structure, and steam injection ports for spraying water vapor are provided on both sides of the scraper steel plate.

2. The oil-rich coal in-situ pyrolysis well wall decontamination device according to claim 1, characterized in that, Connection points are provided at the connection positions of the upper support rod and the auxiliary cylinder, and the lower support rod and the upper support rod. A water pipe is installed inside the dirt separator rod. One end of the water pipe passes through the dirt separator rod, and the other end of the water pipe is connected to the heater.

3. The oil-rich coal in-situ pyrolysis well wall decontamination device according to claim 2, characterized in that, The upper support rod consists of eight rods, which are evenly distributed around the outside of the booster cylinder.

4. The oil-rich coal in-situ pyrolysis well wall decontamination device according to claim 1, characterized in that, A support valve is provided on the outside of the scraper rod, and the support valve is used to adjust the outer diameter of the scraper.

5. The oil-rich coal in-situ pyrolysis well wall decontamination device according to claim 4, characterized in that, The automatic control device is an automatic controller, which is used to control the constant temperature heating and the propulsion of the support valve.

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