Rotary type casing milling barrel jam freeing device and well drilling device with rotary type casing milling barrel jam freeing device

Abstract

The utility model relates to the technical field of well drilling, and particularly discloses a rotary type casing milling barrel unfreezing device. The device comprises a first drill rod and a gear transmission mechanism, the gear transmission mechanism is composed of two gears sealed in a gear box, and openings are formed in the two ends of the gear box and matched with gear holes. And one end of the second drill rod is provided with a positioning key and is connected with the first drill rod through a gear transmission mechanism. And the jam freeing device and the second drill rod are independently arranged. Therefore, when the second drill rod is stuck in the drilling process, namely the drill rod is stuck underground and cannot drill normally, an operator can use the first drill rod of the jam freeing device to convey the whole jam freeing device to the position where the second drill rod is stuck. And when the drilling tool is stuck, the jam freeing device can be conveyed to the stuck position and is clamped with the second drilling rod, and jam freeing is driven through the pressure of drilling fluid. By means of the design, accurate control over the borehole diameter is guaranteed, abrasion is reduced, and drilling efficiency and safety are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling, in particular to a rotary milling barrel jam releaser and a drilling device thereof. Background Art

[0002] During oil drilling operations, the ground is relatively soft during the initial drilling phase (the initial wellbore section), and the wellbore diameter is relatively large. During the mud removal process, if problems arise in the circulation system, such as insufficient circulation flow or inefficient pumping, the mud carrying drill cuttings cannot be effectively removed, causing these cuttings to accumulate within the wellbore. Over time, this accumulated mixture of drill cuttings and mud may solidify, forming a so-called "mud ball," which hinders the movement of the drill pipe. If this condition worsens, the drill pipe may become completely stuck, a phenomenon known as "sticking." Sticking not only delays drilling operations, but also increases operational costs and can even damage drilling equipment. Currently, there are two main solutions to the problem of mud-balled drill pipe. The second solution involves forcibly extracting the mud-balled drill pipe. This typically requires the use of a drilling rig, pulley blocks, and other equipment to apply tension to free the drill pipe from the mud. However, this method carries certain risks, as the drill pipe is limited in the amount of tension it can withstand. If the applied pulling force exceeds the limit of the drill pipe, it may cause the drill pipe to break or other drilling tools to be damaged, thus causing a safety accident. Therefore, although this method is direct and fast, its potential risks cannot be ignored. The first solution is to weld the milling head to the milling tube. The specific operation is to weld the milling head to the milling tube, and then use the drilling rig to push the welded milling tube downward section by section. During the pushing process, the milling tube will rotate at a low speed and perform milling operations along the direction of the mud-packed drill pipe, thereby gradually removing the mud packing on the drill pipe. Although this method can effectively solve the problem of mud-packed drill pipe, its operation process is relatively cumbersome. Each time a section of milling tube is pushed forward, welding and cutting operations are required, which not only consumes a lot of manpower and material resources, but also the entire process is time-consuming and inefficient.

[0003] A jam releaser is disclosed in the patent "A Gear-Driven Horizontal Directional Drilling Jam Releaser" (publication number CN207813541U, hereinafter referred to as prior art 1). In prior art 1, a special jam releaser device is provided on the drill rod. When the drill rod is stuck during drilling and cannot continue drilling, the jam releaser device can be activated and driven to achieve the purpose of jamming. Specifically, when the drill rod is stuck, the operator will start the jam releaser to cause it to produce mechanical actions such as rotation or vibration, thereby driving the entire drill rod to rotate accordingly. This rotational action can effectively help the drill rod get rid of the stuck state, so that it can regain the ability to drill, thereby successfully completing the jam release process.

[0004] However, in existing technology 1, the connection between the releaser and the drill pipe is fixed. This means that during drilling operations, the attached releaser must be carried along. This fixed assembly method has some disadvantages, especially in drilling. Because the releaser is fixedly connected to the drill pipe, it moves with the drill pipe during drilling, which can complicate drilling. In addition, downhole tools need to have a certain degree of flexibility and adaptability during drilling to adapt to different geological conditions and drilling requirements. However, the fixed connection between the releaser and the drill pipe limits this flexibility and adaptability, thereby affecting the performance of the downhole tools. The fixed assembly method between the releaser and the drill pipe in existing technology 1 has certain limitations in practical applications. Moreover, because the releaser itself may be subjected to significant mechanical stress during drilling, especially in larger wellbore environments, it can easily cause equipment wear or damage, increasing maintenance and replacement costs. Utility Model Content

[0005] In view of this, an embodiment of the present invention provides a rotary milling barrel jammer and a drilling device thereof, to solve the problem in the prior art that the drill rod may get stuck during operation and thus the jammer must be carried, causing wear of the jammer.

[0006] In the first aspect, an embodiment of the utility model provides a rotary milling barrel de-jamming device, comprising a first drill rod and a gear transmission mechanism fixedly connected to the first drill rod; the gear transmission mechanism comprises a first gear and a second gear; the first gear and the second gear are arranged in a gear box and the first gear and the second gear are sealed; both ends of the gear box are provided with openings adapted to the gear holes of the first gear and the second gear; the gear transmission mechanism is arranged on the first drill rod through a fixed connection between the second gear and the first drill rod; a keyway is provided on the first gear.

[0007] Preferably, the first drill rod includes a stator and a rotor; the rotor is arranged inside the stator, and a bearing is provided at each end of the stator; the two ends of the rotor are respectively arranged in the bearings at both ends of the stator, and rotate around the axis of the stator based on the bearings.

[0008] Preferably, both ends of the stator are provided with openings, namely a liquid inlet and a liquid outlet; a solution passage cavity is formed between the threads on the screw and the inner wall of the stator.

[0009] Preferably, the rotor is a screw; one end of the screw is provided with a sleeve milling barrel; the sleeve milling barrel is provided with milling teeth at even intervals.

[0010] Preferably, the drilling fluid enters from the liquid inlet end of the first drill pipe and flows out from the liquid outlet end; when the drilling fluid flows in the solution cavity, the screw of the first drill pipe is driven to rotate based on the bearing.

[0011] In the second aspect, a drilling device is provided, including a second drill rod, including a rotary milling barrel release device as described above; the second drill rod is provided with a drilling drill bit for drilling operations; the second drill rod is provided with a positioning key at one end close to the drill bit; the second drill rod and the first drill rod are connected by the gear transmission mechanism; the second drill rod is connected to the first gear by a positioning key and a keyway and when the gear transmission mechanism connects the second drill rod and the first drill rod, driving the first drill rod will drive the second gear, thereby driving the second drill rod to rotate.

[0012] Preferably, when the gear transmission mechanism is installed on the second drill rod, the first gear is sleeved on the second drill rod, and the gear transmission mechanism is moved to a preset position along the path of the second drill rod toward the drilling bit by extending the first drill rod.

[0013] Preferably, there are one or more positioning keys and key slots that are adaptable.

[0014] Preferably, when the gear transmission mechanism moves to a preset position along the path of the second drill rod, the positioning key and the keyway are engaged by rotating the first gear.

[0015] Preferably, the first drill rod is driven, so that the second gear drives the first gear, thereby driving the second drill rod, so that the second drill rod completes the unstuck operation.

[0016] The utility model provides a rotary milling barrel jam release device and a drilling device thereof, which has the following beneficial effects:

[0017] In the setting of the present invention, the jammer and the second drill rod are independently arranged. This means that when the second drill rod encounters a stuck drill during the drilling process, that is, the drill rod is stuck underground and cannot drill normally, the operator can use the first drill rod of the jammer to send the entire jammer device to the position where the second drill rod is stuck. Once the jammer reaches the specified position, it will engage with the second drill rod to form a whole for unblocking. The jammer is driven by drilling fluid of a certain pressure. This driving method can effectively help the jammer exert enough force to loosen and unblock the stuck second drill rod. By independently setting the jammer and the second drill rod, equipment wear or damage is avoided and the cost of maintenance and replacement is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work, and these are all within the scope of protection of the present invention.

[0019] Figure 1 This is a schematic diagram of the structure of a rotary milling barrel unstuck device and its drilling device;

[0020] Figure 2 This is a schematic diagram of the internal structure of a rotary milling barrel unstuck device and its drilling device;

[0021] Figure 3 Schematic diagram of the positioning key structure of the second drill pipe;

[0022] Figure 4 1 is a schematic diagram of the internal structure of the first drill pipe;

[0023] Figure 5 This is a schematic diagram of the keyway structure of the first gear

[0024] Parts and numbers in the picture:

[0025] 100 - first drill rod, 110 - stator, 111 - liquid inlet, 112 - liquid outlet, 120 - rotor, 130 - milling barrel, 131 - milling teeth, 132 - solution passage cavity;

[0026] 200-gear transmission mechanism, 210-first gear, 211-keyway, 220-second gear, 230-gear box;

[0027] 300-second drill pipe, 310-drilling drill bit, 320-positioning key. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It should be noted that, in this article, relational terms such as second and first are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, elements defined by the phrase "comprises..." do not exclude the presence of additional identical elements in the process, method, article, or device that includes the elements. If there is no conflict, the embodiments of the present invention and the various features therein may be combined with each other and are all within the scope of protection of the present invention.

[0029] Example 1

[0030] The present invention provides a rotary milling barrel unstuck device. During initial drilling (primary drilling), especially when traversing various soil layers, mud balls may form, leading to drill sticking. In this situation, the drill bit becomes deeply trapped in the soil, unable to advance or retreat, hindering the entire drilling process. To address this situation, external force must be applied to unstuck the stuck drill bit, allowing it to resume normal operation and resume drilling.

[0031] See Figure 1This embodiment provides a rotary milling barrel jam release device, comprising a first drill rod 100 and a gear transmission mechanism 200 fixedly connected to the first drill rod 100. The jam release device comprises the first drill rod 100 and the gear transmission mechanism 200, which work together to complete the jam release task. The second drill rod 300, described below, is the primary drilling rod and may encounter various complications during the drilling process, causing it to become stuck. When the second drill rod 300 becomes stuck, the jam release device effectively rotates the second drill rod 300. The gear transmission mechanism 200 in the jam release device transmits power to the first drill rod 100, causing it to rotate, which in turn drives the second drill rod 300 to rotate along with it. In this way, the jam release operation is effectively completed, allowing the second drill rod 300 to resume operation and resume drilling operations. The independent configuration of the jam release device and the second drill rod 300 prevents wear or damage to the jam release device during drilling operations, reducing maintenance and replacement costs.

[0032] See Figure 2 In this embodiment, the gear transmission mechanism 200 primarily comprises two key gear assemblies: a first gear 210 and a second gear 220. These two gear assemblies play a crucial role in the mechanical transmission process. Specifically, the gear transmission mechanism 200 achieves a secure connection with the first drill rod 100 through the tight engagement of the second gear 220. This design ensures smooth transmission of power from the power source to the second gear 220, thereby ensuring efficient operation of the entire transmission system.

[0033] See Figure 1 Furthermore, to protect the gear transmission mechanism 200 from external interference, the first gear 210 and the second gear 220 are housed in a dedicated gear box 230. This gear box 230 not only provides necessary protection for the gears but also ensures that the gears are not attacked by impurities such as dirt and mud commonly encountered in drilling operations during operation, thereby preventing these impurities from negatively impacting the gear transmission performance.

[0034] Furthermore, to further ensure the stability and reliability of the gear transmission mechanism 200, both ends of the gearbox 230 are provided with openings larger than the gear holes of the first gear 210 and the second gear 220. These openings not only provide space for the gears but also facilitate the installation of the first drill rod 100 and the second drill rod 300. Specifically, the first drill rod 100 is fixedly mounted to the second gear 220 through its corresponding opening, ensuring stable and reliable power transmission. The second drill rod 300 can be installed with the first gear 210 through another opening when needed, enabling flexible configuration and transmission.

[0035] See Figure 1 and Figure 2 Furthermore, to further enhance transmission efficiency, a keyway 211 is provided on the first gear 210. When the second drill rod 300 needs to be unlocked, the keyway 211 of the first gear 210 engages with a positioning key 320 on the second drill rod 300, ensuring smooth and stable power transmission. This coordination between the keyway 211 and the positioning key 320 not only improves transmission efficiency but also enhances the reliability of the entire transmission system, ensuring stable transmission under various complex operating conditions.

[0036] See Figure 4 In this embodiment, the first drill pipe 100 is composed of two main parts, namely a stator 110 and a rotor 120. The stator 110 is configured as a hollow cylindrical structure, with two bearings installed at both ends. These bearings are fixedly mounted inside the stator 110, ensuring that the rotor 120 can be stably mounted on the bearings. The two ends of the rotor 120 are respectively embedded in the bearings at both ends of the stator 110, allowing the rotor 120 to rotate around the axis of the stator 110. When an external force is applied to the rotor 120, the rotor 120 begins to rotate.

[0037] See Figure 1 The rotor 120 is specifically configured as a screw, one end of which is connected to a sleeve milling barrel 130. A series of milling teeth 131 are evenly distributed on the outer surface of the sleeve milling barrel 130, which perform cutting and cleaning functions during the drilling process. Openings are provided at both ends of the stator 110, serving as a liquid inlet 111 and a liquid outlet 112, respectively. A solution passage 132 is formed between the threads on the screw and the inner wall of the stator 110, which is used to accommodate and guide the flow of the solution.

[0038] During actual use, the solution is injected through the liquid inlet 111 at the higher end of the stator 110 and flows rapidly through the solution cavity 132 under a certain pressure. This flow drives the screw to rotate, thereby achieving rotation of the drill rod. When the first drill rod 100 is placed into the wellhead, since the wellhead has already been preliminarily drilled, blockage is generally not expected. Even if a blockage in the soil is encountered, the rotation and drilling of the first drill rod 100 effectively prevents the problem. In addition, when encountering hard soil, the milling teeth 131 on the sleeve milling barrel 130 can cut and open a path, ensuring that the first drill rod 100 can smoothly enter the wellhead and continue drilling operations. Finally, the treated solution is discharged from the stator 110 through the liquid outlet 112. This process not only ensures the smooth flow of the solution but also imparts a certain impact force to the solution. This impact force not only effectively opens the channel but also softens the surrounding soil, creating favorable conditions for subsequent operations. Specifically, this impact effect can effectively clear obstacles around the wellhead, allowing the first drill rod 100 to enter the wellhead more smoothly, thereby improving the efficiency and safety of the entire drilling operation.

[0039] See Figure 1 Drilling fluid enters through the inlet 111 of the first drill pipe 100, which is connected to the drilling equipment, and then flows out through the outlet 112. During this process, the drilling fluid flows within the solution cavity 132, driving the screw on the first drill pipe 100 to rotate. The screw's rotation is based on contact and friction with the bearings. The bearings serve as support points, ensuring smooth and efficient rotation of the screw. This design allows the drill pipe to rotate continuously during the drilling process, effectively drilling into the ground and achieving the drilling operation goal.

[0040] Example 2

[0041] See Figure 1The present invention provides a drilling rig comprising a second drill pipe 300 and a rotary milling barrel de-stuck device as described in the above embodiment. This de-stuck device is particularly suitable for handling stuck pipe during drilling. If the drilling rig becomes stuck with soil or other material during operation, the de-stuck device can quickly and effectively de-stuck the pipe, allowing drilling operations to continue smoothly. The second drill pipe 300 is equipped with a drilling bit 310, which is specifically used for the drilling portion of the drilling operation. The drilling bit 310, as a drilling bit, primarily performs the drilling operation. Through its rotation and thrust, it effectively penetrates the formation and completes the drilling task. If the drilling bit 310 becomes stuck during drilling, the de-stuck device is required to de-stuck the drilling bit 310 and restore drilling capability. Rotation of the drill bit is achieved by the drilling rig driving the second drill pipe 300, while thrust is achieved by gradually extending the second drill pipe 300. The combination of these two actions allows the drill bit to penetrate deeper into the formation, gradually completing the drilling task. When the drilling bit 310 becomes stuck, timely measures must be taken to release the stuck drill bit. A jam releaser is a tool specifically designed to resolve stuck drill bits, loosening them and restoring their drilling capabilities.

[0042] See Figure 3 and Figure 5 In this embodiment, the second drill rod 300 is structurally designed with a locating key 320 at one end near the drill bit. This locating key 320 ensures precise installation and tight integration of the second drill rod 300 with the gear transmission mechanism 200. This allows the locating key 320 of the second drill rod 300 to engage with the keyway 211 on the first gear 210, thereby achieving efficient power transmission. Specifically, the second drill rod 300 and the first drill rod 100 are connected by the gear transmission mechanism 200. When the second drill rod 300 and the first gear 210 are connected via the locating key 320 and the keyway 211, the gear transmission mechanism 200 effectively connects the second drill rod 300 and the first drill rod 100. Consequently, when the first drill rod 100 is rotated, the first gear 210 also rotates due to the action of the gear transmission mechanism 200. Since the first gear 210 is meshed with the second gear 220, the rotation of the first gear 210 drives the second gear 220. Finally, the rotation of the second gear 220 drives the second drill rod 300 to rotate, thereby achieving efficient operation of the entire drill rod system. Through such an arrangement, not only is the precise fit between the drill rod and the gear transmission mechanism 200 ensured, but also the efficiency and stability of power transmission are ensured.

[0043] During the installation of the gear transmission mechanism 200 and the second drill rod 300, the first gear 210 must first be fitted onto the corresponding position of the second drill rod 300. Next, by extending the first drill rod 100, the entire gear transmission mechanism 200 is moved along the path of the second drill rod 300, gradually moving closer to the drilling bit 310 until it reaches a predetermined position. During this process, ensuring that the gear transmission mechanism 200 is accurately positioned and secured in place is crucial.

[0044] Specifically, one or more of these settings can be included to ensure that the gear transmission mechanism 200 is stably locked in a preset position during movement. This configuration effectively prevents unnecessary sliding or displacement of the gear transmission mechanism 200 during operation, thereby ensuring the stability and reliability of the entire transmission system. This adaptable configuration not only improves the accuracy and efficiency of the device, but also enhances its adaptability and durability in complex working conditions.

[0045] When the gear transmission mechanism 200 moves to a preset position along a predetermined path of the second drill rod 300, the positioning key 320 and the key slot 211 can be engaged by rotating the first gear 210. This engagement method ensures the stability and reliability of the gear transmission mechanism 200 in a specific position.

[0046] See Figure 2 Furthermore, the first drill rod 100 is first driven, causing it to rotate and drive the second gear 220. Subsequently, the second gear 220 drives the first gear 210 through transmission, which in turn drives the second drill rod 300 to rotate. This transmission method allows the second drill rod 300 to complete the unstuck operation, freeing it from its stuck state and resuming normal operation. This arrangement not only improves operational efficiency but also ensures safety and reliability during the operation.

[0047] During use, the jam release device must first be placed on the second drill rod 300. Since the gear transmission mechanism 200 and the second drill rod 300 are connected using a clearance fit, the jam release device can move freely along the path of the second drill rod 300. During this process, the first drill rod 100 continues drilling while extending into the well along the path of the second drill rod 300. The milling teeth 131 on the milling barrel 130 and the solution interact to effectively open the well. When the first drill rod 100 drives the gear transmission mechanism 200 to the position where the locating key 320 engages the keyway 211, the locating key 320 and keyway 211 are precisely engaged. Since the second drill rod 300 is already locked, the engagement operation can be completed relatively easily. Next, the first gear 210 can be drilled to change the position of the keyway 211 on the first gear 210, thereby finding the correct position for engagement with the locating key 320. The pressure of the injected solution can effectively control the screw speed. After the positioning key 320 is engaged with the key slot 211, the pressure of the solution can be increased appropriately to rotate the first drill rod 100 at high speed. In this way, the high-speed rotation of the first drill rod 100 drives the second gear 220 to drive the first gear 210, thereby forcing the second drill rod 300 to rotate, ultimately unblocking the drill rod and restoring the energy efficiency of the equipment.

[0048] Example 3

[0049] See Figure 1 、 Figure 2 and Figure 5 , an embodiment of the utility model provides a rotary milling barrel jammer and a drilling device thereof; during use, it is first necessary to sleeve the first gear 210 on the appropriate position of the second drill rod 300. Then, by extending the first drill rod 100, the gear transmission mechanism 200 can be moved along the path of the second drill rod 300 toward the direction close to the drilling bit 310. When it moves to the preset positioning key 320 position, it is necessary to check whether the positioning key 320 is fully fitted with the keyway 211. If the positioning key 320 and the keyway 211 can fit perfectly, then a fixed connection state is formed between the first gear 210 and the second drill rod 300.

[0050] However, if the positioning key 320 does not align with the keyway 211, the next step is required. Specifically, the rotor 120 is rotated, which in turn drives the second gear 220, thereby causing the first gear 210 to also rotate. This rotation process continues until the positioning key 320 fully aligns with the keyway 211, thereby achieving a fixed connection between the first gear 210 and the second drill rod 300. Once the connection is successful, the first drill rod 100 can be driven, thereby driving the second drill rod 300 in motion.

[0051] If the second drill rod 300 does not move as expected during the driving process, the connection is unsuccessful. In this case, the second drill rod 300 needs to be rotated so that the first gear 210 can drive the second gear 220 to rotate, thereby changing its position and gradually approaching the drilling bit 310. This ensures that the keyway 211 of the first gear 210 and the positioning key 320 can be smoothly assembled, ultimately achieving a stable connection of the entire transmission mechanism.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotary milling barrel de-jamming device, characterized in that: It comprises a first drill rod (100) and a gear transmission mechanism (200) fixedly connected to the first drill rod (100); The gear transmission mechanism (200) comprises a first gear (210) and a second gear (220); the first gear (210) and the second gear (220) are arranged in a gear box (230) and the first gear (210) and the second gear (220) are sealed; both ends of the gear box (230) are provided with openings adapted to the gear holes of the first gear (210) and the second gear (220); The gear transmission mechanism (200) is arranged on the first drill rod (100) through a fixed connection between the second gear (220) and the first drill rod (100); and a keyway (211) is provided on the first gear (210).

2. A rotary milling barrel de-jamming device according to claim 1, characterized in that: The first drill rod (100) includes a stator (110) and a rotor (120); the rotor (120) is arranged inside the stator (110), and a bearing is provided at each end of the stator (110); the two ends of the rotor (120) are respectively arranged in the bearings at the two ends of the stator (110), and the rotor (120) rotates around the axis of the stator (110) based on the bearings.

3. A rotary milling barrel jam release device according to claim 2, characterized in that: The rotor (120) is a screw; a sleeve milling cylinder (130) is provided at one end of the screw; and milling teeth (131) are evenly spaced on the sleeve milling cylinder (130).

4. A rotary milling barrel jam release device according to claim 3, characterized in that: The stator (110) is provided with openings at both ends, namely a liquid inlet (111) and a liquid outlet (112); a solution passage cavity (132) is formed between the threads on the screw and the inner wall of the stator (110).

5. A rotary milling barrel jam release device according to claim 4, characterized in that: The drilling fluid enters the first drill rod (100) through the liquid inlet (111) and flows out through the liquid outlet (112); when the drilling fluid flows in the solution cavity (132), the screw of the first drill rod (100) is driven to rotate based on the bearing.

6. A drilling device comprising a second drill pipe (300); characterized in that: It comprises a rotary milling barrel de-jamming device as claimed in any one of claims 1 to 5; The second drill rod (300) is provided with a drilling bit (310) for drilling operations; the second drill rod (300) is provided with a positioning key (320) at one end close to the drill bit; the second drill rod (300) and the first drill rod (100) are connected in transmission via the gear transmission mechanism (200); The second drill rod (300) is connected to the first gear (210) via a positioning key (320) and a keyway (211), and when the gear transmission mechanism (200) transmits and connects the second drill rod (300) and the first drill rod (100), driving the first drill rod (100) will drive the second gear (220), thereby driving the second drill rod (300) to rotate.

7. A drilling device according to claim 6, characterized in that: When the gear transmission mechanism (200) and the second drill rod (300) are installed, the first gear (210) is sleeved on the second drill rod (300), and the gear transmission mechanism (200) is moved to a preset position along the path of the second drill rod (300) in a direction close to the drilling bit (310) by extending the first drill rod (100).

8. A drilling device according to claim 7, characterized in that: The positioning key (320) and the key slot (211) are adaptively provided with one or more.

9. A drilling device according to claim 8, characterized in that: When the gear transmission mechanism (200) moves to a preset position along the path of the second drill rod (300), the positioning key (320) and the keyway (211) are engaged by rotating the first gear (210).

10. The drilling device according to claim 6, characterized in that: The first drill rod (100) is driven, so that the second gear (220) drives the first gear (210), thereby driving the second drill rod (300), so that the second drill rod (300) completes the unstuck operation.

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