Well wall deicing device and method for freezing method shaft sinking

Abstract

The invention discloses a well wall deicing device and method for freezing method shaft sinking, and relates to the technical field of shaft sinking deicing. Comprising a supporting frame and a shaft, an annular sliding rail is arranged on the inner side of the supporting frame, a sliding block is slidably connected to the inner side of the annular sliding rail, the shaft is located below the supporting frame, a deicing assembly is arranged in the shaft and used for removing ice blocks on the inner wall of the shaft, and the deicing assembly comprises a deicing component and an ice melting component; and the deicing component comprises an arc-shaped plate and a disc, a placing frame is arranged at the top of the arc-shaped plate, an ice breaking cone is arranged on one side of the placing frame, and the disc is located in the placing frame. Through the arrangement of the deicing assembly, all-around covering deicing can be conducted on the inner wall of the shaft, the limitation of manual deicing operation is broken through, the deicing efficiency can be greatly improved and the deicing time can be greatly shortened under the conditions that the depth of the shaft is large and the area of the inner wall is wide, and therefore the problem that the project progress is affected due to the low manual deicing efficiency is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of well drilling and deicing, and in particular to a well wall deicing device and method for well drilling using a freezing method. Background Art

[0002] The freezing method of drilling a well uses artificial refrigeration technology to form a solid frozen wall in the strata around the wellbore. Usually, a certain number of freezing holes are arranged around the wellbore, and low-temperature refrigerants (such as brine, etc.) are circulated and injected into the freezing holes to freeze the water in the strata, thereby freezing the surrounding strata into a closed frozen wall structure with a certain strength and stability. Under the protection of the frozen wall, the wellbore is excavated and the wall is built. As the wellbore continues to be excavated downward, the frozen wall continues to extend downward, always maintaining its support and protection for the strata around the wellbore. During the freezing method of drilling a well, if the ice layer formed on the well wall is not removed in time, it may fall under the action of gravity or the influence of construction vibration, causing serious damage to underground construction personnel and equipment.

[0003] The existing freezing method for deicing the well walls is mostly done manually with mechanical tools such as ice cutters and ice breaker hammers. However, due to the limited space in the wellbore and the inconvenience for workers to operate, only a small area can be de-iced each time. Especially for the case of a deep wellbore and a large inner wall area, the de-icing work may take a long time, seriously affecting the progress of the project. Summary of the invention

[0004] The main purpose of the present invention is to provide a well wall deicing device and method for well drilling by freezing method, so as to overcome the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A well wall deicing device for freezing well drilling comprises a support frame and a wellbore, an annular slide rail is provided on the inner side of the support frame, a slider is slidably connected to the inner side of the annular slide rail, the wellbore is located below the support frame, a deicing assembly is provided inside the wellbore, the deicing assembly is used to remove ice from the inner wall of the wellbore, the deicing assembly comprises a deicing part and an ice melting part, the deicing part comprises an arc plate, a placement frame is provided on the top of the arc plate, and an ice-breaking cone is provided on one side of the placement frame.

[0007] Furthermore, the deicing component also includes a disc, which is located inside the placement frame. A second motor is provided on one side of the placement frame. The output end of the second motor is connected to the disc through a rotating shaft. A crank is provided at one end of the disc, and a track is provided at one end of the placement frame.

[0008] Furthermore, one end of the crank is connected to a connecting rod, and one end of the connecting rod away from the crank is connected to a moving block, the moving block is slidably connected to the track, and the front end of the moving block is connected to the icebreaker cone.

[0009] Furthermore, the ice-melting component includes a heater, which is located above the placement frame, one end of the heater is connected to an air inlet, an air pump is provided on the front side of the heater, both ends of the air pump are connected to connecting pipes, one of the connecting pipes is connected to one end of the heater, and the front side of the other connecting pipe is connected to an air outlet hood.

[0010] Furthermore, the bottom of the sliding block is connected to an L-shaped block, and the bottom of the L-shaped block is connected to a connecting frame.

[0011] Furthermore, two rotating drums are provided inside the connection frame, and the two rotating drums are coaxially arranged. A first motor is provided on one side of the connection frame, and an output end of the first motor is connected to a rotating shaft inside the rotating drum.

[0012] Furthermore, the outer walls of the two rotating drums are provided with connecting steel ropes, and the ends of the two connecting steel ropes away from the rotating drums are connected to the arc-shaped plate.

[0013] Furthermore, two suction cups are provided on the front side of the arc plate, an ultrasonic sensor is provided on one side of the placement frame, and a controller is provided on one side of the placement frame.

[0014] A method for deicing a well wall in a freezing well drilling process comprises the following steps:

[0015] First, the support frame is placed at a suitable position above the wellbore. When deicing is required, the first motor is started, and its output end drives the rotating shaft inside the rotating drum to rotate. Since the two rotating drums are coaxial, they rotate synchronously, so that the connecting steel ropes wound around the outer wall of the rotating drum are retracted and released, thereby realizing the lifting and lowering movement of the arc plate, and adjusting the deicing components and ice melting components on the arc plate to a suitable position relative to the ice layer on the inner wall of the wellbore;

[0016] After the arc plate reaches the deicing position, the suction cup on its front side moves forward under the action of the electric push rod, and then negative pressure is generated inside the suction cup, which is adsorbed on the inner wall of the wellbore to fix the arc plate and prevent the deicing device from shaking during deicing;

[0017] When the de-icing work starts, the second motor in the de-icing component starts running, and the rotating shaft at its output end drives the disc to rotate. The crank at one end of the disc moves in a circle with the disc, and the crank pulls or pushes the moving block through the connecting rod, so that the moving block moves back and forth on the track at one end of the placement frame, thereby driving the ice-breaking cone to make impact movements back and forth, and the sharp head of the ice-breaking cone impacts and breaks the ice on the inner wall of the wellbore;

[0018] For the case of ice layers attached to multiple places on the inner wall of the wellbore, the suction cup is first released from the negative pressure state, and the electric push rod drives the suction cup to move back. At this time, the annular slide rail is started, and the ice-breaking cone can make a circular motion on the annular slide rail along with the slider, and the first motor will also drive the rotating drum 7 to rotate, driving the connecting steel rope of the outer wall to retract and release, so as to realize the up, down, left and right movement of the ice-breaking assembly, and realize the multi-directional coverage and de-icing of the inner wall of the wellbore, thereby improving the de-icing efficiency and shortening the de-icing time;

[0019] After the de-icing components break up the thicker ice layer, some thin ice layer will remain. At this time, the ice melting components start to work, and the air enters the heater from the air inlet. The heater heats the air through the internal heating element, and the air pump transports the heated air to the air outlet hood through the connecting pipe. The hot air blows from the air outlet hood to the ice layer on the inner wall of the wellbore, and the ice layer absorbs heat and melts through heat transfer.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] By setting the deicing components in the deicing assembly, the inner wall of the wellbore can be fully covered and deiced, breaking the limitations of manual deicing operations. For the case of a deep wellbore and a wide inner wall area, the deicing efficiency can be greatly improved and the deicing time can be shortened, thereby effectively solving the problem of low efficiency of manual deicing affecting the project progress;

[0022] By setting up the ice melting parts, after the de-icing parts have broken up the thicker ice layers, these thin ice layers can be effectively processed, thus avoiding the damage to the well wall that may be caused by relying solely on mechanical de-icing, and also improving the thoroughness of de-icing. At the same time, when the ice melting parts face areas where the ice layer is thin or in some corners and gaps on the inner wall of the wellbore, they can transfer heat to these hard-to-reach ice layers through heat conduction or heat radiation to melt them;

[0023] By driving the first motor to retract and release the connecting steel rope to control the lifting and lowering of the arc plate, the deicing component and the ice melting component can be moved flexibly. During the actual deicing process, the position can be adjusted according to the specific position and thickness of the ice layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a cross-sectional view of the wellbore of the present invention.

[0026] Figure 3 It is a schematic diagram of the connection structure between the connecting steel rope and the arc plate of the present invention.

[0027] Figure 4 It is a schematic diagram of the overall structure of the deicing assembly of the present invention.

[0028] Figure 5 It is a schematic diagram of the internal structure of the placement frame of the present invention.

[0029] Figure 6 It is a schematic diagram of the connection structure between the track and the slider of the present invention.

[0030] Among them: 1. support frame; 2. shaft; 3. annular slide rail; 4. slider; 5. L-shaped block; 6. connecting frame; 7. rotating drum; 8. connecting steel rope; 9. arc plate; 10. first motor; 11. placement frame; 12. heater; 13. air inlet; 14. air pump; 15. air outlet hood; 16. ice breaker; 17. second motor; 18. disc; 19. crank; 20. track; 21. connecting rod; 22. moving block; 23. suction cup; 24. connecting pipe. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0032] Example 1

[0033] Combination Figures 1 to 6 The present embodiment provides a well wall deicing device for well drilling by freezing method, comprising a support frame 1 and a wellbore 2, an annular slide rail 3 is provided on the inner side of the support frame 1, and a slider 4 is slidably connected to the inner side of the annular slide rail 3; the wellbore 2 is located below the support frame 1, and a deicing assembly is provided inside the wellbore 2;

[0034] The deicing assembly is used to remove ice blocks on the inner wall of the wellbore 2, and includes a deicing component and an ice melting component. The deicing component includes an arc plate 9, a placement frame 11 is provided on the top of the arc plate 9, and an ice breaking cone 16 is provided on one side of the placement frame 11.

[0035] The annular slide rail 3 is a prior art, so that the ice-breaking cone 16 can make a circular motion on the annular slide rail 3 along with the sliding block 4 .

[0036] By setting the deicing components in the deicing assembly, the inner wall of the wellbore 2 can be de-iced in all directions, breaking the limitations of manual deicing operations. For the case where the wellbore 2 is deep and the inner wall area is large, the deicing efficiency can be greatly improved and the deicing time can be shortened, thereby effectively solving the problem of low efficiency of manual deicing affecting the project progress.

[0037] After the de-icing components break up the thicker ice layer, some thin ice layers often remain. The ice-melting components can effectively handle these thin ice layers, avoiding the damage to the well wall that may be caused by relying solely on mechanical de-icing, while also improving the thoroughness of de-icing.

[0038] For example, in the actual deicing process of the wellbore 2, some of the ice fragments broken by the deicing component may still adhere to the well wall. The ice melting component melts these fragments by heating to make the well wall clean again.

[0039] In areas where the ice layer is thin or in some corners and gaps on the inner wall of the well 2, the de-icing work is mainly completed by the ice melting component. When the ice layer is thin, the ice melting component can be used to melt it quickly. When the ice layer is in some corners and gaps on the inner wall of the well 2, due to space limitations, the ice breaking cone 16 of the de-icing component cannot effectively contact or operate. At this time, the ice melting component can transfer heat to these hard-to-reach ice layers through heat conduction or heat radiation to melt them.

[0040] Reference Figure 4-Figure 6 The de-icing component also includes a disc 18, which is located inside the placement frame 11. A second motor 17 is provided on one side of the placement frame 11. The output end of the second motor 17 is connected to the disc 18 through a rotating shaft. A crank 19 is provided at one end of the disc 18. A track 20 is provided at one end of the placement frame 11. A connecting rod 21 is connected to one end of the crank 19. A moving block 22 is connected to the end of the connecting rod 21 away from the crank 19. The moving block 22 is slidably connected to the track 20, and the front end of the moving block 22 is connected to the ice-breaking cone 16.

[0041] When de-icing, the second motor 17 serves as a power source. When the shaft at its output end rotates, it can drive the disc 18 connected thereto to rotate. The crank 19 at one end of the disc 18 makes a circular motion with the disc 18. When the crank 19 rotates, it will pull or push the connecting rod 21. When the connecting rod 21 moves, it will drive the moving block 22 to slide on the track 20 at one end of the placement frame 11. Since the track 20 limits the movement direction of the moving block 22, the moving block 22 can only make a linear reciprocating motion along the track 20, thereby driving the ice-breaking cone 16 to make a forward and backward impact motion. When the ice-breaking cone 16 impacts forward, its sharp head can impact and break the ice on the inner wall of the wellbore 2, thereby realizing the de-icing operation.

[0042] Reference Figure 3-Figure 4 The ice melting component includes a heater 12, which is located above the placement frame 11. One end of the heater 12 is connected to an air inlet 13, and an air pump 14 is provided on the front side of the heater 12. Both ends of the air pump 14 are connected to connecting pipes 24, one of the connecting pipes 24 is connected to one end of the heater 12, and the front side of the other connecting pipe 24 is connected to an air outlet hood 15.

[0043] The air enters the heater 12 from the air inlet 13. The heater 12 is the core heating component of the entire ice melting component. It heats the incoming air through the internal heating element (such as a resistance wire, etc.). At this time, the air pump 14 transports the air heated by the heater 12 to the air outlet hood 15 connected to the front side thereof through the connecting pipe 24. The hot air will blow toward the ice layer on the inner wall of the wellbore 2, and the ice layer absorbs heat and melts through heat transfer.

[0044] Reference Figure 2-Figure 3 An L-shaped block 5 is connected to the bottom of the slider 4, and a connecting frame 6 is connected to the bottom of the L-shaped block 5. Two rotating drums 7 are arranged inside the connecting frame 6. The two rotating drums 7 are coaxially arranged. A first motor 10 is provided on one side of the connecting frame 6. The output end of the first motor 10 is connected to the rotating shaft inside the rotating drum 7. The outer walls of the two rotating drums 7 are provided with connecting steel ropes 8. The ends of the two connecting steel ropes 8 away from the rotating drum 7 are connected to the arc plate 9.

[0045] When the first motor 10 is running, its output end drives the rotating shaft inside the rotating drum 7 to rotate. Since the two rotating drums 7 are coaxially arranged, they will rotate synchronously. As the rotating drum 7 rotates, the connecting steel rope 8 wound on the outer wall of the rotating drum 7 will be retracted and released. When the rotating drum 7 rotates forward, the connecting steel rope 8 is retracted, and the arc plate 9 at the other end of the connecting steel rope 8 will be lifted upward; when the rotating drum 7 rotates reversely, the connecting steel rope 8 is released, and the arc plate 9 will move downward under the action of gravity. In this way, the lifting and lowering movement of the arc plate 9 is realized, so that the position of the deicing component and the ice melting component on the inner wall of the wellbore 2 can be adjusted.

[0046] By driving the rotating drum 7 to retract and release the connecting steel rope 8 through the first motor 10 to control the lifting and lowering of the arc plate 9, the deicing component and the ice melting component can be moved flexibly. In the actual deicing process, the position can be adjusted according to the specific position and thickness of the ice layer.

[0047] For example, when it is necessary to process the ice layer at a higher position on the inner wall of the wellbore 2, the deicing component and the ice melting component can be sent to a suitable height by lifting the arc plate 9.

[0048] Reference Figure 3-Figure 4 Two suction cups 23 are provided on the front side of the arc plate 9, an ultrasonic sensor is provided on one side of the placement frame 11, and a controller is provided on one side of the placement frame 11.

[0049] Two electric push rods (not shown) are provided inside the arc plate 9, and their output ends are connected to one end of the suction cup 23 (which is a negative pressure suction cup in the prior art). When the arc plate 9 reaches the ice layer position, negative pressure is generated inside the suction cup 23, and the suction cup 23 will be tightly adsorbed on the inner wall of the wellbore 2 to fix the arc plate 9 and prevent the de-icing device from shaking during de-icing.

[0050] The ultrasonic sensor can detect the thickness of the ice layer on the inner wall of the wellbore 2 in real time and accurately. By accurately understanding the thickness of the ice layer, the operator can choose the appropriate deicing method and parameters according to the actual situation.

[0051] For example, for thinner ice layers, a lower power ice melting method can be used or the impact force of the ice breaker cone 16 can be appropriately adjusted to avoid over-processing; for thicker ice layers, the working intensity of the de-icing components can be increased or the ice melting time can be extended. This precise ice layer detection capability improves the targeting and efficiency of de-icing work, and also helps reduce energy consumption and equipment wear.

[0052] As the core control unit of the entire de-icing device, the controller realizes intelligent control and automated operation. It can be electrically connected to the annular slide rail 3, the first motor 10, the heater 12, the air pump 14, the second motor 17, the electric push rod and the suction cup 23 according to the data fed back by the ultrasonic sensor and other equipment, and can automatically adjust the working status of the de-icing components and the ice-melting components, thereby realizing automated control of the de-icing process.

[0053] Example 2

[0054] This embodiment provides a method for deicing a well wall during well drilling by freezing method, which specifically includes the following steps:

[0055] First, the support frame 1 is placed at a suitable position above the shaft 2. When de-icing operation is required, the first motor 10 is started, and its output end drives the rotating shaft inside the rotating drum 7 to rotate. Since the two rotating drums 7 are coaxial, they rotate synchronously, so that the connecting steel rope 8 wrapped around the outer wall of the rotating drum 7 is retracted and released, thereby realizing the lifting and lowering movement of the arc plate 9, and adjusting the de-icing components and ice-melting components on the arc plate 9 to a suitable position relative to the ice layer on the inner wall of the shaft 2.

[0056] After the arc plate 9 reaches the deicing position, the suction cup 23 on its front side moves forward under the action of the electric push rod, and then negative pressure is generated inside the suction cup 23, which is tightly adsorbed on the inner wall of the wellbore 2 to fix the arc plate 9 and prevent the deicing device from shaking during deicing.

[0057] When de-icing begins, the second motor 17 in the de-icing component runs, and the rotating shaft at its output end drives the disc 18 to rotate. The crank 19 at one end of the disc 18 makes a circular motion with the disc 18. The crank 19 pulls or pushes the moving block 22 through the connecting rod 21, so that the moving block 22 makes a linear reciprocating motion on the track 20 at one end of the placement frame 11, thereby driving the ice-breaking cone 16 to make a forward and backward impact motion, and the sharp head of the ice-breaking cone 16 impacts and breaks the ice on the inner wall of the well 2. For the ice layer attached to the inner wall of the well 2 at multiple locations, the suction cup 23 is first released from the negative pressure state, and the electric push rod drives the suction cup 23 to move back. At this time, the annular slide 3 is started, and the ice-breaking cone 16 can make a circular motion on the annular slide 3 with the slider 4, and the first motor 10 will also drive the rotating drum 7 to rotate, driving the connecting steel rope 8 of the outer wall to be retracted and released, so as to realize the up, down, left and right movement of the ice-breaking component, and realize the multi-directional coverage and de-icing of the inner wall of the well 2, improve the de-icing efficiency, and shorten the de-icing time.

[0058] After the de-icing component breaks up the thicker ice layer, some thin ice layers will remain. At this time, the ice melting component starts to work, and air enters the heater 12 from the air inlet 13. The heater 12 heats the air through the internal heating element. The air pump 14 transports the heated air to the air outlet hood 15 through the connecting pipe 24. The hot air is blown from the air outlet hood 15 to the ice layer on the inner wall of the wellbore 2, and the ice layer absorbs heat and melts through heat transfer.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A well wall deicing device for freezing well drilling, characterized in that: The invention comprises a support frame (1) and a wellbore (2), wherein an annular slide rail (3) is provided on the inner side of the support frame (1), and a slider (4) is slidably connected to the inner side of the annular slide rail (3); the wellbore (2) is located below the support frame (1); a deicing assembly is provided inside the wellbore (2), and the deicing assembly is used to remove ice blocks on the inner wall of the wellbore (2); the deicing assembly comprises a deicing component and an ice melting component; the deicing component comprises an arc plate (9), a placement frame (11) is provided on the top of the arc plate (9), and an ice breaking cone (16) is provided on one side of the placement frame (11).

2. A well wall deicing device for freezing well drilling as claimed in claim 1, characterized in that: The deicing component also includes a disc (18), the disc (18) being located inside the placement frame (11), a second motor (17) being provided on one side of the placement frame (11), an output end of the second motor (17) being connected to the disc (18) via a rotating shaft, a crank (19) being provided at one end of the disc (18), and a track (20) being provided at one end of the placement frame (11).

3. A well wall deicing device for freezing well drilling as claimed in claim 2, characterized in that: One end of the crank (19) is connected to a connecting rod (21), and one end of the connecting rod (21) away from the crank (19) is connected to a moving block (22). The moving block (22) is slidably connected to the track (20), and the front end of the moving block (22) is connected to the ice-breaking cone (16).

4. A deicing device for a well wall in a freezing well drilling process as claimed in claim 1, characterized in that: The ice melting component comprises a heater (12), the heater (12) is located above the placement frame (11), one end of the heater (12) is connected to an air inlet (13), an air pump (14) is provided on the front side of the heater (12), both ends of the air pump (14) are connected to connecting pipes (24), one of the connecting pipes (24) is connected to one end of the heater (12), and the front side of the other connecting pipe (24) is connected to an air outlet cover (15).

5. A deicing device for a well wall in a freezing well drilling process as claimed in claim 1, characterized in that: The bottom of the sliding block (4) is connected to an L-shaped block (5), and the bottom of the L-shaped block (5) is connected to a connecting frame (6).

6. A well wall deicing device for freezing well drilling as claimed in claim 5, characterized in that: Two rotating drums (7) are arranged inside the connecting frame (6), and the two rotating drums (7) are coaxially arranged. A first motor (10) is arranged on one side of the connecting frame (6), and an output end of the first motor (10) is connected to a rotating shaft inside the rotating drum (7).

7. A well wall deicing device for freezing well drilling as claimed in claim 6, characterized in that: The outer walls of the two rotating drums (7) are each provided with a connecting steel rope (8), and one end of the two connecting steel ropes (8) away from the rotating drum (7) is connected to the arc-shaped plate (9).

8. A deicing device for a well wall in a freezing well drilling process as claimed in claim 1, characterized in that: Two suction cups (23) are provided on the front side of the arc-shaped plate (9), an ultrasonic sensor is provided on one side of the placement frame (11), and a controller is provided on one side of the placement frame (11).

9. A method for deicing a well wall during freezing well drilling as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: First, the support frame (1) is placed at a suitable position above the wellbore (2). When deicing is required, the first motor (10) is started, and its output end drives the rotating shaft inside the rotating drum (7) to rotate. Since the two rotating drums (7) are coaxial, they rotate synchronously, so that the connecting steel rope (8) wound around the outer wall of the rotating drum (7) is retracted and released, thereby realizing the lifting and lowering movement of the arc plate (9), and adjusting the deicing component and the ice melting component on the arc plate (9) to a suitable position relative to the ice layer on the inner wall of the wellbore (2); After the arc plate (9) reaches the deicing position, the suction cup (23) on the front side thereof moves forward under the action of the electric push rod, and then negative pressure is generated inside the suction cup (23), which is adsorbed on the inner wall of the wellbore (2), thereby fixing the arc plate (9) and preventing the deicing device from shaking during deicing; When deicing begins, the second motor (17) in the deicing component starts running, and the rotating shaft at the output end drives the disc (18) to rotate. The crank (19) at one end of the disc (18) moves in a circle with the disc (18). The crank (19) pulls or pushes the moving block (22) through the connecting rod (21), so that the moving block (22) moves back and forth on the track (20) at one end of the placement frame (11), thereby driving the ice-breaking cone (16) to make a forward and backward impact movement. The sharp head of the ice-breaking cone (16) impacts and breaks the ice blocks on the inner wall of the wellbore (2); In the case of ice layers attached to multiple locations on the inner wall of the wellbore (2), the suction cup (23) is firstly released from the negative pressure state, and the electric push rod drives the suction cup (23) to move back. At this time, the annular slide rail (3) is started, and the ice-breaking cone (16) can make a circular motion on the annular slide rail (3) along with the slider (4), and the first motor (10) can also drive the rotating drum (7) to rotate, driving the connecting steel rope (8) of the outer wall to be retracted and released, so as to realize the up, down, left and right movement of the ice-breaking assembly, and realize the multi-directional coverage and de-icing of the inner wall of the wellbore (2), thereby improving the de-icing efficiency and shortening the de-icing time; After the de-icing component breaks up the thicker ice layer, some thin ice layers will remain. At this time, the ice melting component starts to work, and air enters the heater (12) from the air inlet (13). The heater (12) heats the air through the internal heating element. The air pump (14) transports the heated air to the air outlet hood (15) through the connecting pipe (24). The hot air is blown from the air outlet hood (15) to the ice layer on the inner wall of the wellbore (2), and the ice layer absorbs heat and melts through heat transfer.

Images