Device and method for reducing frictional resistance during pull-back of directional drilling pipeline

Abstract

The invention provides a device and a method for reducing frictional resistance during pull-back of a directional drilling pipeline, and relates to the technical field of directional drilling. Comprising a reamer, a reaming assembly is arranged on the surface of the reamer, the reaming assembly is used for enlarging the diameter of a drilled hole in the pipeline back-dragging process so that a pipeline can pass through the drilled hole, one end of the reamer is in threaded connection with an auxiliary assembly, and the auxiliary assembly is used for scraping and consolidating the inner wall of the drilled hole with the enlarged diameter. And the other end of the reamer is in threaded connection with a lubricating assembly, and the lubricating assembly is used for releasing a lubricating agent in the lubricating assembly into a drill hole in the back dragging process of the pipeline. By arranging the reaming assembly, the auxiliary assembly and the lubricating assembly, when the pipeline is recycled, the friction force between the pipeline and the hole channel wall can be reduced, and the pipeline back-dragging smoothness and the construction efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of directional drilling, and in particular to a device and method for reducing frictional resistance when a directional drilling pipeline is pulled back. Background Art

[0002] The working principle of horizontal directional drilling is to use the thrust and rotational force of the drill pipe to perform horizontal drilling operations. Specifically, the thrust is pushed forward through the drill pipe to push the drill bit into the rock or soil; the rotational force is achieved through the rotation of the drill pipe, which causes the drill tool part of the drill bit to rotate to cut and break the formation. During the drilling process, drilling fluid is continuously circulated and injected to cool the drill bit, flush debris and provide lubrication. This technology is widely used in municipal engineering, oil and gas extraction, communication pipeline laying and other fields. In directional drilling construction, pipeline dragging is a key link, and the pre-laid pipeline is dragged back to the target location through the drilling channel.

[0003] When performing pipeline backhaul operations, due to the large friction between the mud and soil in the channel and the pipeline, the problem of excessive friction resistance often occurs during the backhaul process, resulting in low construction efficiency. In order to reduce the friction resistance during the backhaul process, the prior art usually uses auxiliary materials such as lubricants and mud treatment agents, or reduces the friction resistance by optimizing the smoothness of the outer wall of the pipeline. However, these methods often have limitations in practical applications, especially in long-distance, large-diameter pipeline backhaul, the friction resistance is still difficult to effectively control. Therefore, the present application provides a device and method for reducing the friction resistance during directional drilling pipeline backhaul to meet the needs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a device and method for reducing the friction resistance when a directional drilling pipeline is pulled back, so as to solve the existing problem that the pipeline is difficult to move due to the large friction resistance when the pipeline is pulled back.

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

[0006] A device for reducing frictional resistance during the pullback of a directional drilling pipeline comprises a reamer, a reamer surface is provided with a reamer assembly, the reamer assembly is used to expand the diameter of the borehole during the process of pulling back the pipeline so that the pipeline can pass through the borehole, one end of the reamer is threadedly connected to an auxiliary assembly, the auxiliary assembly is used to scrape and consolidate the inner wall of the borehole after the diameter is expanded so that the pipeline is smoother during movement, the other end of the reamer is threadedly connected to a lubrication assembly, the lubrication assembly is used to release internal lubricant into the borehole during the process of pulling back the pipeline, the other end of the auxiliary assembly is hung with a pipeline, and the other end of the lubrication assembly is threadedly connected to a drill rod.

[0007] Optionally, a curved surface is provided on the reamer, water spray holes are provided on the curved surface of the reamer, a ring array of fixing grooves is opened on one side of the reamer, a cavity structure is provided in the reamer, and the water spray holes are connected to the cavity structure.

[0008] Optionally, the reaming assembly comprises a fixed ring, the surface of which is fixedly connected with three groups of reaming parts in an annular array, and a group of first rollers with uniform intervals are rotatably connected to the reaming parts.

[0009] Optionally, the reaming portion includes a first reaming plate and a second reaming plate, both of which are spiral plates, the first roller is rotatably connected between the first reaming plate and the second reaming plate, a mud drainage groove is provided between two adjacent reaming portions, and the mud drainage groove is located between the adjacent first reaming plate and the second reaming plate.

[0010] Optionally, a group of fixing plates in an annular array are fixedly connected to the interior of the fixing ring, the fixing ring is sleeved on the reamer, the fixing plates are inserted in the fixing grooves, and the fixing plates are fixed to the reamer by screws.

[0011] Optionally, the auxiliary component includes a connecting rod, a side of which is rotatably connected to three groups of first auxiliary rods and second auxiliary rods in annular arrays, and one end of the connecting rod is fixedly connected to the support frame of the three annular arrays.

[0012] Optionally, the other ends of the first auxiliary rod and the second auxiliary rod are both rotatably connected to the bottom of the scraper plate, a spring telescopic rod is rotatably connected to the support frame, the movable end of the spring telescopic rod is rotatably connected to the middle position of the second auxiliary rod, and the surface of the scraper plate is a smooth curved surface.

[0013] Optionally, the lubrication assembly includes a support tube, a tube wall of the support tube is provided with an interlayer, an oil storage bag is provided in the interlayer of the support tube, the oil storage bag is provided with lubricating oil, a push block is slidably connected to the support tube, and a second roller in a ring array is rotatably connected to the push block.

[0014] Optionally, a group of annular array slide grooves are opened on the support tube, a ring-shaped array placement groove is opened at one end of the support tube, a group of annular array oil spray heads are arranged at one end of the oil storage bag, the oil spray heads are located in the placement grooves, a push ring is fixedly connected to the push block through a support rod, the push ring is slidably connected in the interlayer of the support tube, the support rod on the push ring is slidably connected in the slide groove, a ratchet is arranged on the inner side of the second roller, an auxiliary shaft is rotatably connected to the second roller, a pawl is arranged on the auxiliary shaft, the pawl is cooperatively connected to the ratchet, and the auxiliary shaft is fixedly connected to the push block.

[0015] The present application also provides a method for reducing the friction resistance of a directional drilling pipeline during pullback, comprising the following steps:

[0016] S1. The operator threads the drill bit onto the lubrication assembly and drills a borehole underground in the target area;

[0017] S2. After the drill bit is exposed to the ground, the operator removes the drill bit and threads the reamer onto the lubrication assembly, while hanging the pipe on one end of the auxiliary assembly;

[0018] S3. When the operator pulls back the pipe, the reaming assembly on the reamer reams the borehole to increase the diameter of the borehole, and the pipe follows the auxiliary assembly into the expanded borehole;

[0019] S4. When the pipeline is pulled back, the lubrication assembly is located in front of the reamer. When the friction in the borehole increases, the lubrication assembly will release the lubricant.

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

[0021] In the above scheme, by setting up the reaming assembly, during the process of pulling back the pipe, the first roller will roll against the inner wall of the borehole, which can not only reduce the friction between the reamer and the inner wall of the borehole, but also the soil and mud will be discharged from the spiral mud discharge groove, avoiding the soil and mud from accumulating in front of the reamer for a long time and reducing the resistance of the reamer when moving.

[0022] By setting up auxiliary components, during the process of pulling back the pipeline, the scraper plate will be tightly attached to the inner wall of the drilled hole under the action of the compressed spring telescopic rod, and will also squeeze the inner wall of the drilled hole. When the scraper plate rotates, it can not only smooth the inner wall of the drilled hole, but also keep the inner wall of the drilled hole smooth. When the pipeline contacts the inner wall, the friction between the pipeline and the inner wall of the drilled hole will be reduced due to the smooth surface of the inner wall, thereby reducing the consumption during the pipeline pulling back and improving the smoothness and construction efficiency of the pipeline pulling back.

[0023] By setting up the lubrication assembly, when encountering a place with greater resistance during the process of pulling the pipeline back, the lubricating oil in the oil storage bag will be released from the oil spray head into the mud, making it easier for the reamer and the reaming assembly to expand the hole here, while also increasing the smoothness of the inner wall of the borehole, thereby reducing the friction between the pipeline and the borehole here. Furthermore, when the resistance is greater, the distance the push block moves will be longer, so that more lubricating oil is released from the oil storage bag, further reducing the friction resistance and ensuring the best lubrication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0025] Figure 1 The invention is a three-dimensional structural schematic diagram of a device and method for reducing frictional resistance when pulling back a directional drilling pipeline.

[0026] Figure 2 It is a schematic structural diagram of the connection between the reamer and the reaming assembly of the present invention.

[0027] Figure 3 It is a schematic structural diagram of the reamer of the present invention.

[0028] Figure 4 It is a schematic diagram of the structure of the hole expansion assembly of the present invention.

[0029] Figure 5 It is a side view of the hole expansion assembly of the present invention.

[0030] Figure 6 It is a schematic diagram of the structure of the auxiliary components of the present invention.

[0031] Figure 7 It is a partial structural schematic diagram of the auxiliary components of the present invention.

[0032] Figure 8 It is a schematic diagram of the structure of the lubrication component of the present invention.

[0033] Fig. 9 It is a schematic diagram of the structure of the support tube of the present invention.

[0034] Fig.10 It is a cross-sectional view of the oil storage bag of the present invention.

[0035] Fig.11 It is a structural schematic diagram of the push block of the present invention.

[0036] Fig.12 It is a schematic structural diagram of the second roller of the present invention.

[0037] Reference numerals:

[0038] 1. Hole expander; 11. Water spray hole; 12. Fixed groove; 2. Hole expansion assembly; 21. Fixed ring; 211. Fixed plate; 22. Hole expansion part; 221. First hole expansion plate; 222. Second hole expansion plate; 23. First roller; 24. Mud discharge groove; 3. Auxiliary assembly; 31. Connecting rod; 311. First auxiliary rod; 312. Second auxiliary rod; 313. Support frame; 32. Scraping plate; 33. Spring telescopic rod; 4. Lubrication assembly; 41. Support tube; 411. Slide groove; 412. Placement groove; 42. Oil storage bag; 421. Oil spray head; 43. Push block; 431. Push ring; 44. Second roller; 441. Ratchet; 442. Auxiliary shaft; 443. Ratchet.

[0039] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0040] The following is a detailed description of a device and method for reducing frictional resistance during the pullback of a directional drilling pipe provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0041] It should be noted that the references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0042] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0043] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0044] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0045] like Figures 1 to 12 As shown, an embodiment of the present invention provides a device for reducing friction resistance during the back-pulling of a directional drilling pipeline, including a reamer 1, a reamer component 2 is arranged on the surface of the reamer 1, and the reamer component 2 is used to expand the diameter of the borehole during the process of back-pulling the pipeline so that the pipeline can pass through the borehole, one end of the reamer 1 is threadedly connected with an auxiliary component 3, and the auxiliary component 3 is used to scrape and consolidate the inner wall of the borehole after the diameter is enlarged, so that the pipeline is smoother during movement, and the other end of the reamer 1 is threadedly connected with a lubrication component 4, and the lubrication component 4 is used to release the internal lubricant into the borehole during the process of back-pulling the pipeline, the other end of the auxiliary component 3 is hung with a pipeline, and the other end of the lubrication component 4 is threadedly connected with a drill rod, when the operator is operating the pipeline When the road is towed back, it is necessary to remove the drill bit on the drill pipe, thread the reamer 1 on the lubrication component 4, and hang the pipe on the auxiliary component 3. Then, the reamer 1 will enter the borehole under the action of the drill pipe. At this time, the drill pipe will rotate under the action of the drilling machine and drive the reamer 1 to rotate. When the reamer 1 rotates, the reaming component 2 on the reamer 1 will stir in the borehole, thereby expanding the diameter of the borehole. At the same time, the pipe on the auxiliary component 3 will follow the reamer 1 into the borehole. During this process, the lubrication component 4 is located in front of the reamer 1. When the friction in the borehole increases, the lubrication component 4 will release lubricating oil to mix the lubricating oil with the mud to reduce the friction of the inner wall of the borehole.

[0046] As an implementation method in this embodiment, Figures 2 to 5As shown, the reaming assembly 2 includes a fixing ring 21, and three groups of reaming parts 22 in an annular array are fixedly connected on the surface of the fixing ring 21, and a group of evenly spaced first rollers 23 are rotatably connected in the reaming part 22, and the reaming part 22 includes a first reaming plate 221 and a second reaming plate 222, and the first reaming plate 221 and the second reaming plate 222 are both spiral plates, and the first roller 23 is rotatably connected between the first reaming plate 221 and the second reaming plate 222, and a mud discharge groove 24 is provided between two adjacent reaming parts 22, and the mud discharge groove 24 is located between the adjacent first reaming plates 221 and the second reaming plates 222, and a curved surface is provided on the reamer 1, and a water spray hole 11 is provided on the curved surface of the reamer 1, and a fixed groove 12 in an annular array is provided on one side of the reamer 1, and a cavity structure is provided in the reamer 1, and the water spray hole 11 and the cavity structure The structures are connected, and a group of annular array fixing plates 211 are fixedly connected to the inside of the fixing ring 21, the fixing ring 21 is sleeved on the reamer 1, the fixing plate 211 is inserted in the fixing groove 12, and the fixing plate 211 is fixed to the reamer 1 by screws. When the reamer 1 enters the borehole, the reamer 1 will start to rotate under the action of the drill rod, and when the reamer 1 rotates, the fixing ring 21 fixed on the reamer 1 will rotate synchronously with the reamer 1, and the reaming part 22 fixed on the fixing ring 21 will also rotate. When the reaming part 22 rotates, the first reaming plate 221 and the second reaming plate 222 will scrape the inner wall of the borehole to remove excess soil in the inner wall of the borehole and expand the borehole at the same time. The scraped soil and mud will flow to the other side of the reamer 1 along the arc-shaped mud discharge groove 24.

[0047] In this embodiment, if Figures 2 to 5 As shown, when the reaming portion 22 rotates in the borehole, since the first roller 23 is arranged in an equidistant spiral arrangement in the reaming portion 22 and a portion of the first roller 23 exceeds the first reaming plate 221 and the second reaming plate 222, the first roller 23 will roll on the inner wall of the borehole. In this way, not only the friction between the reamer 1 and the inner wall of the borehole can be reduced, but also the soil and mud can be discharged from the spiral mud discharge groove 24, thereby avoiding the soil and mud from accumulating in front of the reamer 1 for a long time and reducing the resistance of the reamer 1 when moving.

[0048] As an implementation method in this embodiment, Figure 6 to Figure 7As shown, the auxiliary component 3 includes a connecting rod 31, and the side of the connecting rod 31 is rotatably connected with three groups of first auxiliary rods 311 and second auxiliary rods 312 in an annular array. One end of the connecting rod 31 is fixedly connected with three groups of supporting frames 313 in an annular array. The other ends of the first auxiliary rod 311 and the second auxiliary rod 312 are both rotatably connected to the bottom of the scraping plate 32. The support frame 313 is rotatably connected with a spring telescopic rod 33. The movable end of the spring telescopic rod 33 is rotatably connected to the middle position of the second auxiliary rod 312. The surface of the scraping plate 32 is a smooth cambered surface. When the reamer 1 completely enters the borehole, the connecting rod 31 will also enter the borehole immediately. At this time, due to the expansion The drilling radius is smaller than the distance between the scraper plate 32 and the connecting rod 31. At this time, the scraper plate 32 will be squeezed, and the first auxiliary rod 311 and the second auxiliary rod 312 start to rotate and squeeze the spring telescopic rod 33 at the same time. When the auxiliary component 3 completely enters the drilled hole, the three groups of scraper plates 32 are all in contact with the inner wall of the drilled hole. When the reamer 1 rotates, the connecting rod 31 starts to rotate. At this time, the scraper plate 32 will rotate against the inner wall of the drilled hole. When the scraper plate 32 rotates, it will scrape the inner wall of the drilled hole to make the inner wall of the drilled hole smoother. When the pipe connected to the connecting rod 31 contacts the inner wall of the drilled hole, the friction between the pipe and the inner wall of the drilled hole can be reduced.

[0049] In this embodiment, if Figure 6 to Figure 7 As shown, when the scraper plate 32 rotates, the scraper plate 32 will be tightly attached to the inner wall of the borehole under the action of the compressed spring telescopic rod 33, and will also squeeze the inner wall of the borehole. When the scraper plate 32 rotates, it can not only level the inner wall of the borehole, but also keep the inner wall of the borehole smooth. When the pipe contacts the inner wall, the friction between the pipe and the inner wall of the borehole will be reduced due to the smooth surface of the inner wall.

[0050] As an implementation method in this embodiment, Figures 8 to 12As shown, the lubrication assembly 4 includes a support tube 41, a sandwich is provided in the tube wall of the support tube 41, an oil storage bag 42 is provided in the sandwich of the support tube 41, and lubricating oil is provided in the oil storage bag 42, a push block 43 is slidably connected to the support tube 41, and a second roller 44 of an annular array is rotatably connected to the push block 43, a group of slide grooves 411 of an annular array are provided on the support tube 41, a placement groove 412 of an annular array is provided at one end of the support tube 41, and a group of oil spray heads 421 of an annular array are provided at one end of the oil storage bag 42 The oil injection head 421 is located in the placement groove 412, and a push ring 431 is fixedly connected to the push block 43 through a support rod. The push ring 431 is slidably connected to the interlayer of the support tube 41, and the support rod on the push ring 431 is slidably connected to the slide groove 411. A ratchet 441 is provided on the inner side of the second roller 44, and an auxiliary shaft 442 is rotatably connected in the second roller 44. A pawl 443 is provided on the auxiliary shaft 442, and the pawl 443 is matched with the ratchet 441. The auxiliary shaft 442 is fixedly connected to the push block 43. When the operator When the drill is used to drill into the ground, the second roller 44 will contact the inner wall of the borehole. At this time, the second roller 44 will start to rotate under the action of friction, and the push block 43 will remain stationary. When the pipeline is pulled back, the reamer 1 will be connected to the support tube 41. At this time, the support tube 41 is located in front of the reamer 1. When the support tube 41 moves in the borehole and encounters a place with greater friction, the second roller 44 will first contact the place with greater friction. At this time, the second roller 44 should rotate in the opposite direction, but due to the thorns, the second roller 44 will rotate in the opposite direction. The wheel 441 is stuck by the pawl 443, and the second roller 44 cannot rotate. At this time, the second roller 44 will slide on the support tube 41 following the push block 43. When the push block 43 slides, the push ring 431 will squeeze the oil storage bag 42. When the oil storage bag 42 is squeezed, the lubricating oil in the oil storage bag 42 will be released from the oil spray head 421 into the mud, making it easier for the reamer 1 and the reaming assembly 2 to expand the hole here, while also increasing the smoothness of the inner wall of the borehole, thereby reducing the friction between the pipeline and the borehole here.

[0051] like Figures 1 to 12 As shown, an embodiment of the present invention provides a method for reducing the friction resistance of a directional drilling pipeline during backhaul, comprising the following steps:

[0052] S1, the operator threads the drill bit onto the lubrication assembly 4 and drills a borehole underground in the target area;

[0053] S2. After the drill bit is exposed to the ground, the operator removes the drill bit and threads the reamer 1 onto the lubrication assembly 4, while hanging the pipe on one end of the auxiliary assembly 3;

[0054] S3, when the operator pulls back the pipeline, the reaming assembly 2 on the reamer 1 reams the borehole to increase the diameter of the borehole, and at the same time, the pipeline follows the auxiliary assembly 3 to enter the expanded borehole;

[0055] S4. When the pipeline is pulled back, the lubrication assembly 4 is located in front of the reamer 1. When the friction in the borehole increases, the lubrication assembly 4 releases lubricating fluid.

[0056] The working principle of the technical solution provided by the present invention is as follows: when the operator is pulling back the pipeline, it is necessary to remove the drill bit on the drill rod, thread the reamer 1 on the lubrication component 4, and hang the pipeline on the auxiliary component 3. Then, the reamer 1 will enter the borehole under the action of the drill rod. At this time, the drill rod will rotate under the action of the drilling machine and drive the reamer 1 to rotate. When the reamer 1 rotates, the reaming component 2 on the reamer 1 will stir in the borehole, thereby expanding the diameter of the borehole. At the same time, the pipeline on the auxiliary component 3 will follow the reamer 1 into the borehole. During this process, the lubrication component 4 is located in front of the reamer 1. When the friction force in the borehole increases, the lubrication component 4 will release the lubricating oil to lubricate the borehole. The lubricating oil is mixed with the mud to reduce the friction of the inner wall of the borehole. When the reamer 1 enters the borehole, the reamer 1 will start to rotate under the action of the drill rod. When the reamer 1 rotates, the fixing ring 21 fixed on the reamer 1 will rotate synchronously with the reamer 1, and the reaming part 22 fixed on the fixing ring 21 will also rotate. When the reaming part 22 rotates, the first reaming plate 221 and the second reaming plate 222 will scrape the inner wall of the borehole to remove excess soil in the inner wall of the borehole and expand the borehole at the same time. The scraped soil and mud will flow along the arc-shaped mud discharge groove 24 to the other side of the reamer 1. When the reaming part 22 rotates in the borehole, since the arrangement of the first roller 23 in the reaming part 22 is an equidistant spiral arrangement At the same time, a part of the first roller 23 exceeds the first reaming plate 221 and the second reaming plate 222, so the first roller 23 will roll against the inner wall of the borehole. In this way, not only the friction between the reamer 1 and the inner wall of the borehole can be reduced, but also the soil and mud can be discharged from the spiral mud discharge groove 24, thereby avoiding the soil and mud from gathering in front of the reamer 1 for a long time, reducing the resistance of the reamer 1 when moving. When the reamer 1 completely enters the borehole, the connecting rod 31 will also enter the borehole immediately. At this time, since the expanded borehole radius is smaller than the distance between the scraping plate 32 and the connecting rod 31, the scraping plate 32 will be squeezed, and the first auxiliary rod 311 and the second auxiliary rod 312 start to rotate, and at the same time squeeze the spring extension rod 31. When the auxiliary component 3 is fully inserted into the borehole, the three groups of scraping plates 32 are all in contact with the inner wall of the borehole. When the reamer 1 rotates, the connecting rod 31 starts to rotate. At this time, the scraping plates 32 will stick to the inner wall of the borehole and rotate. When the scraping plates 32 rotate, they will scrape the inner wall of the borehole to make the inner wall of the borehole smoother. When the pipe connected to the connecting rod 31 contacts the inner wall of the borehole, the friction between the pipe and the inner wall of the borehole can be reduced. When the scraping plates 32 rotate, the scraping plates 32 will be tightly attached to the inner wall of the borehole under the action of the compressed spring telescopic rod 33, and will also squeeze the inner wall of the borehole. When the scraping plates 32 rotate, not only can the inner wall of the borehole be leveled, but also the inner wall of the borehole can be kept smooth.When the pipe contacts the inner wall, the friction between the pipe and the inner wall of the borehole will be reduced due to the smooth surface of the inner wall. When the operator uses the drill bit to drill into the ground, the second roller 44 will contact the inner wall of the borehole. At this time, the second roller 44 will start to rotate under the action of friction, and the push block 43 will remain stationary. When the pipe is dragged back, the reamer 1 will be connected to the support tube 41. At this time, the support tube 41 is located in front of the reamer 1. When the support tube 41 moves in the borehole and encounters a place with greater friction, the second roller 44 will first contact the place with greater friction. At this time, the second roller 44 should rotate in the opposite direction, but because the ratchet 441 is stuck by the pawl 443, the second roller 44 cannot rotate. At this time, the second roller 44 will follow the push block 43 to slide on the support tube 41. When the push block 43 slides, the push ring 431 will squeeze the oil storage bag 42. When the oil storage bag 42 is squeezed, the lubricating oil in the oil storage bag 42 will be released from the oil spray head 421 into the mud, making it easier for the reamer 1 and the reaming assembly 2 to reame here, while also increasing the smoothness of the inner wall of the borehole, thereby reducing the friction between the pipeline and the borehole here.

[0057] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for reducing frictional resistance during directional drilling pipeline pullback, characterized in that: It includes a reamer, a reamer component is arranged on the surface of the reamer, the reamer component is used to expand the diameter of the borehole during the process of pulling back the pipeline so that the pipeline can pass through the borehole, one end of the reamer is threadedly connected with an auxiliary component, the auxiliary component is used to scrape and consolidate the inner wall of the borehole after the diameter is expanded so that the pipeline can move more smoothly, the other end of the reamer is threadedly connected with a lubrication component, the lubrication component is used to release the internal lubricant into the borehole during the process of pulling back the pipeline, the other end of the auxiliary component is hung with a pipeline, and the other end of the lubrication component is threadedly connected with a drill rod.

2. The device for reducing frictional resistance during directional drilling pipeline pulling back according to claim 1, characterized in that: The reamer is provided with a curved surface, the curved surface of the reamer is provided with water spray holes, one side of the reamer is provided with a ring array of fixing grooves, the reamer is provided with a cavity structure, and the water spray holes are connected with the cavity structure.

3. The device for reducing frictional resistance during directional drilling pipeline pulling back according to claim 2, characterized in that: The reaming assembly comprises a fixed ring, and three groups of reaming parts in an annular array are fixedly connected to the surface of the fixed ring, and a group of first rollers with uniform intervals are rotatably connected to the reaming parts.

4. The device for reducing frictional resistance during directional drilling pipeline pulling back according to claim 3, characterized in that: The expansion part includes a first expansion plate and a second expansion plate, both of which are spiral plates, the first roller is rotatably connected between the first expansion plate and the second expansion plate, and a mud discharge groove is provided between two adjacent expansion parts, and the mud discharge groove is located between the adjacent first expansion plate and the second expansion plate.

5. The device for reducing frictional resistance during directional drilling pipeline pulling back according to claim 4, characterized in that: A group of annular array fixing plates are fixedly connected inside the fixing ring, the fixing ring is sleeved on the reamer, the fixing plates are inserted in the fixing grooves, and the fixing plates are fixed on the reamer by screws.

6. The device for reducing frictional resistance during directional drilling pipeline pulling back according to claim 5, characterized in that: The auxiliary component comprises a connecting rod, a side of which is rotatably connected to three groups of first auxiliary rods and second auxiliary rods in an annular array, and one end of the connecting rod is fixedly connected to the support frames of the three annular arrays.

7. The device for reducing frictional resistance during directional drilling pipeline pullback according to claim 6, characterized in that: The other ends of the first auxiliary rod and the second auxiliary rod are both rotatably connected to the bottom of the scraper plate, and a spring telescopic rod is rotatably connected to the support frame. The movable end of the spring telescopic rod is rotatably connected to the middle position of the second auxiliary rod, and the surface of the scraper plate is a smooth curved surface.

8. The device for reducing frictional resistance during directional drilling pipeline pulling back according to claim 7, characterized in that: The lubrication assembly includes a support tube, a tube wall of the support tube is provided with an interlayer, an oil storage bag is provided in the interlayer of the support tube, the oil storage bag is provided with lubricating oil, a push block is slidably connected to the support tube, and a second roller of an annular array is rotatably connected to the push block.

9. The device for reducing frictional resistance during directional drilling pipeline pulling back according to claim 8, characterized in that: A group of annular array slide grooves are provided on the support tube, a ring-shaped array placement groove is provided at one end of the support tube, a group of annular array oil spray heads are provided at one end of the oil storage bag, the oil spray heads are located in the placement grooves, a push ring is fixedly connected to the push block through a support rod, the push ring is slidably connected in the interlayer of the support tube, the support rod on the push ring is slidably connected in the slide groove, a ratchet is provided on the inner side of the second roller, an auxiliary shaft is rotatably connected to the second roller, a pawl is provided on the auxiliary shaft, the pawl is cooperated with the ratchet, and the auxiliary shaft is fixedly connected to the push block.

10. The method for reducing frictional resistance of a directional drilling pipeline during pull-back according to claim 9, characterized in that: The following steps are involved: S1. The operator threads the drill bit onto the lubrication assembly and drills a borehole underground in the target area; S2. After the drill bit is exposed to the ground, the operator removes the drill bit and threads the reamer onto the lubrication assembly, while hanging the pipe on one end of the auxiliary assembly; S3. When the operator pulls back the pipe, the reaming assembly on the reamer reams the borehole to increase the diameter of the borehole, and the pipe follows the auxiliary assembly into the expanded borehole; S4. When the pipeline is pulled back, the lubrication assembly is located in front of the reamer. When the friction in the borehole increases, the lubrication assembly will release the lubricant.

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