Ultra-short radius sidetracking operation device and method

Abstract

The invention discloses an ultra-short radius sidetrack drilling operation device and method, and relates to the technical field of short radius sidetrack drilling operation, the ultra-short radius sidetrack drilling operation device comprises a drilling platform, the upper side of the drilling platform is fixedly connected with a rotary driving device, the lower side of the drilling platform is provided with an inclined drilling rod, the inner side of the inclined drilling rod is provided with a cavity, and the inner side of the cavity is provided with a rotary driving device; the outer end of the inclined drill rod is fixedly connected with a drill bit, a plurality of spray holes are formed in the outer side of the drill bit, the upper side of the drilling platform is fixedly connected with two containing tanks, the outer sides of the containing tanks are fixedly connected with pump bodies, and the upper sides of the containing tanks are fixedly connected with feeding pipes. According to the ultra-short radius sidetrack drilling operation device, by arranging the containing tank, the pump body, the mixing tank, the connecting pipe, the inclined drilling rod and the drilling bit, drilling fluid and steel grit can be conveniently introduced into a drilled hole during sidetrack drilling, and the steel grit, the drilling fluid and lubricating fluid can be conveniently and uniformly mixed through the rotating rod, the rotating box and the stirring plate, so that subsequent drilling is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of short-radius sidetracking operations, and in particular to an ultra-short-radius sidetracking operation device and method. Background Art

[0002] Sidetracking is a process in which special tools are used to make the drill bit's drilling trajectory deviate from the original wellbore trajectory. It is mainly used in the exploitation and development of oil, gas, water wells, etc.

[0003] After searching, the Chinese patent with application number "CN201510501315.9" is specifically a rapid and continuous window sidetracking device. It performs casing window opening operations, and lowers the window sidetracking drill bit together with the drill pipe into the wellbore until the drill bit reaches the whipstock. Turn on the mud pump, and the drilling fluid passes through the main line valve, the riser, the faucet, and enters the drill pipe and the drill bit. The drilling fluid is ejected from the window sidetracking drill bit nozzle, and then returns from the wellbore annulus to the wellhead and returns to the mud pool. After a period of circulation, the drill pipe rotates. Open the injection pipeline inlet valve and the injection pipeline outlet valve, and slowly close the main line valve. The drilling fluid pumped out by the mud pump enters the injection pipeline and reaches the bottom of the steel sand injection tank. The steel sand is continuously mixed with the drilling fluid under the action of gravity and the vibration of the steel sand vibrator to form a mixture of steel sand and drilling fluid. The empty volume formed after the steel sand falls is filled by the drilling fluid injected from the balance pipeline. The mixture of steel sand and drilling fluid passes through the riser, enters the drill pipe, and reaches the downhole window sidetracking drill bit.

[0004] During side drilling, a mixture of steel sand and drilling fluid is introduced into the drill pipe and sprayed out from the nozzle on the drill bit to maintain the stability of the borehole and improve drilling efficiency. During side drilling, the whipstock is lowered into a designated position in the wellbore to facilitate subsequent side drilling. Since steel sand is easy to agglomerate during transportation, it is directly mixed and injected into the well, which affects the drilling efficiency. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an ultra-short radius side drilling device and method, which solves the problem of uneven mixing of steel grit and drilling fluid when steel grit and drilling fluid are introduced into the borehole during side drilling.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: An ultra-short radius side drilling operation device comprises a drilling platform, a rotary drive device is fixedly connected to the upper side of the drilling platform, an inclined drill rod is arranged on the lower side of the drilling platform, a cavity is arranged on the inner side of the inclined drill rod, a drill bit is fixedly connected to the outer end of the inclined drill rod, a plurality of spray holes are opened on the outer side of the drill bit, two containing tanks are fixedly connected to the upper side of the drilling platform, a pump body is fixedly connected to the outer side of the containing tank, a feed pipe is fixedly connected to the upper side of the containing tank, a mixing conveying unit is arranged on the upper side of the drilling platform, and a support leg is fixedly connected to the lower side of the drilling platform; The mixing and conveying unit includes a cover plate, the lower side of the cover plate is rotatably connected to a rotating rod, the lower end of the rotating rod is fixedly connected to a rotating box, the inner sides of the upper and lower ends of the rotating box are rotatably connected to connecting rods, the outer side of the connecting rod is fixedly connected to a rocker, the outer sides of the upper and lower ends of the rocker are rotatably connected to inclined plates, a rectangular hole is opened on the outer side of the rotating box, and the outer sides of the inclined plates on the upper and lower sides are rotatably connected to stirring plates.

[0007] Preferably, the mixing and conveying unit also includes a vertical pole, which is fixedly connected to the upper side of the drilling platform, a fixing ring is fixedly connected to the upper end of the vertical pole, a mixing tank is fixedly connected to the inner side of the fixing ring, a conveying pipe is fixedly connected between the mixing tank and the pump body, a valve is provided on the outer side of the conveying pipe, the cover plate is fixedly connected to the upper side of the mixing tank, a motor and a steel sand delivery pipe are fixedly connected to the upper side of the cover plate, a connecting pipe is provided between the mixing tank and the rotating drive device, and a solenoid valve is provided on the outer side of the connecting pipe.

[0008] Preferably, a rectangular groove is provided on the upper side of the rocker, the inner side of the rectangular groove is rotatably connected to a control block, the outer side of the control block is rotatably connected to a swivel block, the front side of the swivel block is fixedly connected to a control rod 1, the control rod 1 is rotatably connected to a swivel box, the upper side of the swivel box is rotatably connected to a control rod 2, the lower end of the control rod 2 passes through the inner side of the swivel box and is fixedly connected to a bevel gear 2, the outer side of the control rod 1 is fixedly connected to a bevel gear 1, the upper end of the control rod 2 is fixedly connected to a gear part, the lower side of the cover plate is fixedly connected to a mounting rod, and the lower end of the mounting rod is fixedly connected to a gear ring.

[0009] Preferably, the bevel gear 1 is meshedly connected with the bevel gear 2, the gear ring is meshedly connected with the gear member, and the control block and the rotating block are both arranged in an inclined structure.

[0010] Preferably, a fixed box is fixedly connected to the outer side of the rotating box, and the fixed box is slidably connected to the two stirring plates.

[0011] Preferably, the front and rear sides of the stirring plate are fixedly connected with side blocks, the outer sides of the side blocks on the front and rear sides are rotatably connected with branch plates, the side of the branch plates on the front and rear sides close to the stirring plate are fixedly connected with mounting block one, the outer sides of the mounting block one on the front and rear sides are rotatably connected with linkage plates, the outer sides of the linkage plates are rotatably connected with mounting block two, the side of the mounting block two close to the fixed box is fixedly connected with a slider, and a limiting rod is fixedly connected between the slider and the fixed box.

[0012] Preferably, outer sides of the control rod 1 on the upper and lower sides are fixedly connected with pulleys, and a belt is arranged between the pulleys on the upper and lower sides.

[0013] A method for ultra-short radius sidetracking operation comprises the following steps: S1, lower the whipstock into the wellbore, then lower the drill bit and the oblique drill pipe into the wellbore, and start the rotary drive device to control the oblique drill pipe and the drill bit to rotate for sidetracking; S2. Drilling fluid and lubricant are placed in two storage tanks respectively, and the pump body is started to transport the drilling fluid and lubricant to the mixing tank, and steel sand is introduced into the mixing tank through the steel sand delivery pipe. At the same time, the motor is started to control the rotating box and the stirring plate to rotate and connect, so that the steel sand, drilling fluid and lubricant are evenly mixed together, and the stirring plates on the upper and lower sides are controlled to move left and right repeatedly, and the branch plates are controlled to swing repeatedly for stirring; S3. After the stirring is completed, the electromagnetic valve is controlled to pass the mixture of steel sand, drilling fluid and lubricating fluid into the drill bit, and the mixture is sprayed out through the spray hole before drilling.

[0014] Beneficial Effects The present invention provides an ultra-short radius sidetracking device and method. Compared with the prior art, it has the following beneficial effects: (1) The ultra-short radius side drilling device is provided with a containing tank, a pump body, a mixing tank, a connecting pipe, an inclined drill pipe and a drill bit, so that drilling fluid and steel sand can be introduced into the borehole during side drilling, and the steel sand, drilling fluid and lubricating fluid can be evenly mixed through a rotating rod, a rotating box and a stirring plate, so as to facilitate subsequent drilling.

[0015] (2) The ultra-short radius side drilling device is provided with a seesaw, an inclined plate, a stirring plate, a control block, a rotating block, a control rod 1, a control rod 2, a gear part and a gear ring, so that when the stirring plate stirs the material, the stirring plates on the upper and lower sides are controlled to move left and right repeatedly, thereby increasing the stirring and mixing effect and facilitating the subsequent drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the overall three-dimensional structure diagram of the present invention; Figure 2 It is a three-dimensional structural diagram of the mixing and conveying unit in the figure of the present invention; Figure 3 It is a partial three-dimensional structural diagram of the mixing and conveying unit in the present invention; Figure 4 It is a cross-sectional three-dimensional structural diagram of the transfer box of the present invention; Figure 5 for Figure 4 The enlarged view of point A in the middle; Figure 6 for Figure 4 The enlarged view of point B in the middle; Figure 7 It is a partial three-dimensional structural diagram of the transfer box of the present invention in section; Figure 8 It is a three-dimensional structural diagram of the stirring plate in the present invention; Fig. 9 for Figure 8 Enlarged view of point C in the middle.

[0017] In the figure: 1, drilling platform; 2, support leg; 3, rotary drive device; 4, oblique drill pipe; 5, drill bit; 6, spray hole; 7, mixing and conveying unit; 8, holding tank; 9, pump body; 10, feed pipe; 11, conveying pipe; 12, valve; 701, mixing tank; 702, fixing ring; 703, vertical pole; 704, solenoid valve; 705, connecting pipe; 706, cover plate; 707, motor; 708, steel sand delivery pipe; 709, rotating rod; 710, rotating box; 711, fixed box; 712, connecting rod; 713, seesaw; 714, inclined plate; 715, rectangular hole; 716, rectangular groove; 717, control block; 718, rotating block; 719, control lever 1; 720, bevel gear 1; 721, bevel gear 2; 722, control lever 2; 723, gear part; 724, gear ring; 725, mounting rod; 726, stirring plate; 727, belt; 728, side block; 729, branch plate; 730, mounting block 1; 731, linkage plate; 732, mounting block 2; 733, slider; 734, limit rod. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment 1 See also Figure 1 - Figure 7The present invention provides an ultra-short radius side drilling operation device, comprising a drilling platform 1, a rotary drive device 3 is fixedly connected to the upper side of the drilling platform 1, an inclined drill rod 4 is arranged on the lower side of the drilling platform 1, a cavity is arranged on the inner side of the inclined drill rod 4, a drill bit 5 is fixedly connected to the outer end of the inclined drill rod 4, a plurality of spray holes 6 are opened on the outer side of the drill bit 5, two containing tanks 8 are fixedly connected to the upper side of the drilling platform 1, a pump body 9 is fixedly connected to the outer side of the containing tank 8, and a feed pipe 1 is fixedly connected to the upper side of the containing tank 8 0, a mixing and conveying unit 7 is arranged on the upper side of the drilling platform 1, and a supporting leg 2 is fixedly connected to the lower side of the drilling platform 1. Before side drilling, the whipstock is first placed in the drilling barrel, and then the inclined drill rod 4 and the drill bit 5 are placed in the drilling barrel, and the side drilling operation is performed under the action of the whipstock, wherein the two containing tanks 8 contain lubricating oil and drilling fluid respectively, and by starting the pump body 9, under the action of the conveying pipe 11, the drilling fluid and the lubricating fluid are conveniently passed into the mixing tank 701, so as to facilitate the subsequent mixing.

[0020] The mixing and conveying unit 7 includes a vertical pole 703, which is fixedly connected to the upper side of the drilling platform 1. The upper end of the vertical pole 703 is fixedly connected with a fixing ring 702, and the inner side of the fixing ring 702 is fixedly connected with a mixing tank 701. A conveying pipe 11 is fixedly connected between the mixing tank 701 and the pump body 9, and a valve 12 is arranged on the outer side of the conveying pipe 11. A cover plate 706 is fixedly connected to the upper side of the mixing tank 701, and a motor 707 and a steel sand delivery pipe 708 are fixedly connected to the upper side of the cover plate 706. A rotating rod 709 is rotatably connected to the lower side of the cover plate 706, and a rotating box 710 is fixedly connected to the lower end of the rotating rod 709. The inner sides of the upper and lower ends of the rotating box 710 are both rotatably connected with connecting rods 712, and the outer side of the connecting rod 712 is fixedly connected with a rocker 713. The outer sides of the upper and lower ends of 13 are rotatably connected with inclined plates 714, a rectangular hole 715 is provided on the outer side of the rotating box 710, and the outer sides of the upper and lower inclined plates 714 are rotatably connected with stirring plates 726, a connecting pipe 705 is provided between the mixing tank 701 and the rotating drive device 3, and a solenoid valve 704 is provided on the outer side of the connecting pipe 705, a rectangular groove 716 is provided on the upper side of the seesaw 713, and a control block 717 is rotatably connected to the inner side of the rectangular groove 716, and a rotating block 718 is rotatably connected to the outer side of the control block 717, and a control rod 719 is fixedly connected to the front side of the rotating block 718, and the control rod 719 is rotatably connected to the rotating box 710, and the upper side of the rotating box 710 is rotatably connected to the control rod 2 722, and the lower end of the control rod 2 722 passes through the inner side of the rotating box 710 and A bevel gear 721 is fixedly connected, a bevel gear 720 is fixedly connected to the outer side of the control rod 719, a gear part 723 is fixedly connected to the upper end of the control rod 722, a mounting rod 725 is fixedly connected to the lower side of the cover plate 706, a gear ring 724 is fixedly connected to the lower end of the mounting rod 725, the bevel gear 720 is meshed with the bevel gear 721, the gear ring 724 is meshed with the gear part 723, the control block 717 and the rotating block 718 are both arranged in an inclined structure, the outer sides of the upper and lower control rods 719 are fixedly connected with pulleys, a belt 727 is arranged between the upper and lower pulleys, the steel sand is passed into the mixing tank 701 through the steel sand delivery pipe 708, and the motor 707 is started at the same time, the motor 707 drives the rotating rod 709 to rotate, and the rotating rod 709 The rotating box 710 is driven to rotate, and the rotating box 710 drives the stirring plate 726 to rotate, so that the stirring plate 726 evenly mixes the steel sand, lubricating fluid and drilling fluid. During the mixing process, the rotating box 710 drives the control rod 2 722 to rotate, and the control rod 2 722 drives the gear member 723 to rotate. Since the gear member 723 is meshed and connected with the gear ring 724, the gear member 723 rotates, and the gear member 723 drives the control rod 2 722 to rotate, and the control rod 2 722 drives the bevel gear 2 721 to rotate, and the bevel gear 2 721 drives the bevel gear 1 720 to rotate, and the bevel gear 1 720 drives the control rod 1 719 to rotate, and the control rod 1 719 drives the rotating block 718 to rotate, and the rotating block 718 drives the control block 717 to swing, and the control block 717 drives the seesaw 713 to swing.The seesaw 713 drives the inclined plate 714 to swing repeatedly, and the inclined plate 714 drives the stirring plate 726 to move left and right repeatedly. As the seesaw 713 swings, the stirring plates 726 on the upper and lower sides move left and right alternately, thereby increasing the stirring effect of the stirring plates 726 on the steel sand.

[0021] Embodiment 2 like Figure 8 , Fig. 9 As shown, an ultra-short radius side drilling operation device includes a drilling platform 1, a rotary drive device 3 is fixedly connected to the upper side of the drilling platform 1, an inclined drill rod 4 is arranged on the lower side of the drilling platform 1, a cavity is arranged on the inner side of the inclined drill rod 4, a drill bit 5 is fixedly connected to the outer end of the inclined drill rod 4, a plurality of spray holes 6 are opened on the outer side of the drill bit 5, two containing tanks 8 are fixedly connected to the upper side of the drilling platform 1, a pump body 9 is fixedly connected to the outer side of the containing tank 8, and a feed pipe 10 is fixedly connected to the upper side of the containing tank 8 A mixing and conveying unit 7 is provided on the upper side of the drilling platform 1, and a supporting leg 2 is fixedly connected to the lower side of the drilling platform 1. Before side drilling, the whipstock is first placed in the drilling barrel, and then the inclined drill rod 4 and the drill bit 5 are placed in the drill barrel, and the side drilling operation is performed under the action of the whipstock. The two containing tanks 8 contain lubricating oil and drilling fluid respectively. By starting the pump body 9 and under the action of the conveying pipe 11, the drilling fluid and the lubricating liquid are conveniently passed into the mixing tank 701 to facilitate the subsequent mixing.

[0022] The outer side of the rotating box 710 is fixedly connected with a fixed box 711, and the fixed box 711 is slidably connected to the two stirring plates 726. The front and rear sides of the stirring plates 726 are fixedly connected with side blocks 728. The outer sides of the front and rear side blocks 728 are rotatably connected with branch plates 729. The front and rear branch plates 729 are fixedly connected with a mounting block 1 730 on one side close to the stirring plate 726. The outer sides of the front and rear side mounting blocks 1 730 are rotatably connected with linkage plates 731. The outer side of the linkage plate 731 is rotatably connected with a mounting block 2 732. The mounting block 2 732 is close to the fixed box 711. A slider 733 is fixedly connected to the side, and a limiting rod 734 is fixedly connected between the slider 733 and the fixed box 711. When the stirring plate 726 moves left and right repeatedly, under the limiting action of the limiting rod 734, the stirring plate 726 drives the branch plate 729 and the linkage plate 731 to swing repeatedly, so that the branch plate 729 and the linkage plate 731 can stir the steel sand again and mix it conveniently. After the steel sand is mixed, the solenoid valve 704 is controlled to open, so that the steel sand enters the oblique drill rod 4 and the drill bit 5 through the connecting pipe 705, and the steel sand mixture is discharged through a plurality of spray holes 6, so as to facilitate the subsequent side drilling.

[0023] A method for ultra-short radius sidetracking operation comprises the following steps: S1, lower the whipstock into the wellbore, then lower the drill bit 5 and the oblique drill rod 4 into the wellbore, and start the rotary drive device 3 to control the oblique drill rod 4 and the drill bit 5 to rotate for sidetracking; S2, the drilling fluid and the lubricant are respectively placed in two holding tanks 8, the pump body 9 is started, the drilling fluid and the lubricant are transported to the mixing tank 701, and the steel sand is introduced into the mixing tank 701 through the steel sand delivery pipe 708, and the motor 707 is started at the same time, the rotating box 710 is controlled to rotate and connect with the stirring plate 726, so that the steel sand, the drilling fluid and the lubricant are uniformly mixed together, and the stirring plates 726 on the upper and lower sides are controlled to move left and right repeatedly, and the branch plate 729 is controlled to swing repeatedly for stirring; S3. After the stirring is completed, the electromagnetic valve 704 is controlled to pass the mixture of steel sand, drilling fluid and lubricating fluid into the drill bit 5, and the mixture is sprayed out through the spray hole 6 before drilling.

[0024] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-short radius sidetracking device, comprising a drilling platform (1), wherein a rotary drive device (3) is fixedly connected to the upper side of the drilling platform (1), an inclined drill rod (4) is arranged on the lower side of the drilling platform (1), a cavity is arranged on the inner side of the inclined drill rod (4), a drill bit (5) is fixedly connected to the outer end of the inclined drill rod (4), and a plurality of spray holes (6) are opened on the outer side of the drill bit (5), characterized in that: Two containing tanks (8) are fixedly connected to the upper side of the drilling platform (1); a pump body (9) is fixedly connected to the outer side of the containing tank (8); a feed pipe (10) is fixedly connected to the upper side of the containing tank (8); a mixing and conveying unit (7) is arranged on the upper side of the drilling platform (1); and a support leg (2) is fixedly connected to the lower side of the drilling platform (1); The mixing and conveying unit (7) comprises a cover plate (706), the lower side of the cover plate (706) is rotatably connected to a rotating rod (709), the lower end of the rotating rod (709) is fixedly connected to a rotating box (710), the inner sides of the upper and lower ends of the rotating box (710) are both rotatably connected to connecting rods (712), the outer sides of the connecting rods (712) are fixedly connected to a seesaw (713), the outer sides of the upper and lower ends of the seesaw (713) are both rotatably connected to inclined plates (714), the outer side of the upper and lower ends of the rotating box (710) is provided with a rectangular hole (715), and the outer sides of the inclined plates (714) on the upper and lower sides are both rotatably connected to stirring plates (726).

2. The ultra-short radius sidetracking device according to claim 1, characterized in that: The mixing and conveying unit (7) further comprises a vertical pole (703), wherein the vertical pole (703) is fixedly connected to the upper side of the drilling platform (1), a fixing ring (702) is fixedly connected to the upper end of the vertical pole (703), a mixing tank (701) is fixedly connected to the inner side of the fixing ring (702), a conveying pipe (11) is fixedly connected between the mixing tank (701) and the pump body (9), a valve (12) is arranged on the outer side of the conveying pipe (11), the cover plate (706) is fixedly connected to the upper side of the mixing tank (701), a motor (707) and a steel sand delivery pipe (708) are fixedly connected to the upper side of the cover plate (706), a connecting pipe (705) is arranged between the mixing tank (701) and the rotary drive device (3), and a solenoid valve (704) is arranged on the outer side of the connecting pipe (705).

3. The ultra-short radius sidetracking device according to claim 1, characterized in that: A rectangular groove (716) is provided on the upper side of the rocker plate (713); a control block (717) is rotatably connected to the inner side of the rectangular groove (716); a rotating block (718) is rotatably connected to the outer side of the control block (717); a control rod 1 (719) is fixedly connected to the front side of the rotating block (718); the control rod 1 (719) is rotatably connected to the rotating box (710); a control rod 2 (722) is rotatably connected to the upper side of the rotating box (710); a lower end of the control rod 2 (722) passes through the inner side of the rotating box (710) and is fixedly connected to a bevel gear 2 (721); a bevel gear 1 (720) is fixedly connected to the outer side of the control rod 1 (719); a gear member (723) is fixedly connected to the upper end of the control rod 2 (722); a mounting rod (725) is fixedly connected to the lower side of the cover plate (706); a gear ring (724) is fixedly connected to the lower end of the mounting rod (725).

4. The ultra-short radius sidetracking device according to claim 3, characterized in that: The bevel gear 1 (720) is meshedly connected with the bevel gear 2 (721), the gear ring (724) is meshedly connected with the gear member (723), and the control block (717) and the rotating block (718) are both arranged in an inclined structure.

5. The ultra-short radius sidetracking device according to claim 1, characterized in that: A fixed box (711) is fixedly connected to the outer side of the rotating box (710), and the fixed box (711) is slidably connected to the two stirring plates (726).

6. The ultra-short radius sidetracking device according to claim 5, characterized in that: The front and rear sides of the stirring plate (726) are fixedly connected to side blocks (728); the outer sides of the side blocks (728) on the front and rear sides are rotatably connected to branch plates (729); the sides of the branch plates (729) on the front and rear sides close to the stirring plate (726) are fixedly connected to mounting blocks 1 (730); the outer sides of the mounting blocks 1 (730) on the front and rear sides are rotatably connected to linkage plates (731); the outer sides of the linkage plates (731) are rotatably connected to mounting blocks 2 (732); the side of the mounting blocks 2 (732) close to the fixed box (711) is fixedly connected to a slider (733); a limiting rod (734) is fixedly connected between the slider (733) and the fixed box (711).

7. The ultra-short radius sidetracking device according to claim 3, characterized in that: The outer sides of the control rod 1 (719) on the upper and lower sides are fixedly connected to pulleys, and a belt (727) is arranged between the pulleys on the upper and lower sides.

8. A method for ultra-short radius sidetracking, according to the ultra-short radius sidetracking device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, lowering the whipstock into the wellbore, then lowering the drill bit (5) and the oblique drill rod (4) into the wellbore, and starting the rotary drive device (3) to control the oblique drill rod (4) and the drill bit (5) to rotate for side drilling; S2, the drilling fluid and the lubricant are placed in two storage tanks (8) respectively, the pump body (9) is started, the drilling fluid and the lubricant are transported to the mixing tank (701), and the steel sand is introduced into the mixing tank (701) through the steel sand delivery pipe (708), and the motor (707) is started at the same time, the rotating box (710) and the stirring plate (726) are controlled to rotate and connect, so that the steel sand, the drilling fluid and the lubricant are uniformly mixed together, and the stirring plates (726) on the upper and lower sides are controlled to move left and right repeatedly, and the branch plate (729) is controlled to swing repeatedly for stirring; S3. After the stirring is completed, the electromagnetic valve (704) is controlled to pass the mixture of steel sand, drilling fluid and lubricating fluid into the drill bit (5), and the mixture is sprayed out through the spray hole (6) before drilling.

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