Petroleum exploitation reaming equipment facilitating dumping

Abstract

The invention relates to the technical field of petroleum well reaming, in particular to petroleum exploitation reaming equipment convenient for dumping, which comprises a drill bit and a connecting rotating shaft, the connecting rotating shaft is fixedly mounted at the top of the drill bit through threads, a first sliding groove is formed in the side wall of the drill bit, and a lifting sliding cylinder is slidably mounted on the side wall of the drill bit; a first sliding block is integrally formed on the inner wall of the lifting sliding barrel. Slurry in a borehole is pushed through a sector plate and a shifting plate, so that the slurry scours soil debris and rock debris accumulated on the inner wall of the borehole through spewing, the rock debris and the soil debris are brought out, the scraping plate cleans the soil debris and the rock debris accumulated on the inner wall of the borehole through rotation of the scraping plate, and meanwhile the inner wall of the borehole is smeared with the slurry. Slurry forms a firm mud cake with uniform thickness on the inner wall of a borehole through stirring of the mud, and the mud in the borehole is stirred through a scraper and a supporting rod, so that soil chips and rock chips are always in a flowing state in the borehole, and the soil chips and the rock chips are prevented from being accumulated in the borehole to form blockage and precipitation.

Description

Technical Field

[0001] The invention relates to the technical field of oil well hole enlargement, in particular to an oil well hole enlargement device which is convenient for soil discharge. Background Art

[0002] In oil production, hole reaming equipment plays a vital role. It is not only related to the efficiency and quality of drilling operations, but also directly affects the cementing quality, production cost and safety of oil wells. At present, roller reamer is usually used for hole reaming in the process of oil production. Its working principle mainly depends on the rotation and cutting action of the roller drill bit. During the hole reaming process, the roller drill bit generates cutting force through rotation to break rocks or soil, thereby achieving the purpose of hole reaming. The soil and rock cuttings cut off are removed from the wellbore through mud circulation. Mud circulation helps to cool the drill bit, carry drilling cuttings, stabilize the wellbore and reduce the cost of drilling. The mud pump is used to transport mud to the drill pipe to wash the bottom of the hole, and the mud carrying soil and rock chips rises along the annular space between the drill pipe and the hole wall. The mud flows from the wellhead to the sedimentation tank, and is used again after purification. This operation is repeated to form a circulation system. However, during the mud discharge process, the soil and rock chips are brought out by the overflow of the mud. However, the mud overflows slowly, causing the soil and rock chips to accumulate inside the wellbore and cause blockage, resulting in the problem of being unable to discharge soil. At the same time, the mud is in a static state inside the wellbore, where soil and rock chips are prone to precipitation, causing soil and rock chips to be adsorbed on the inner wall of the wellbore and cause blockage. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the background technology and to propose a hole enlarging device for oil mining which is convenient for soil discharge.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The cam is provided with a plurality of support rods which are evenly distributed on the side wall of the drill bit, and the support rods are provided with a plurality of support rods which are evenly distributed on the side wall of the drill bit.

[0006] In the above-mentioned reaming equipment for oil mining that is convenient for soil discharge, a fixing ring 2 is fixedly installed on the side wall of the drill bit, and the fixing ring 2 is located above a sliding ring 1. A spring 1 is provided between the fixing ring 2 and the sliding ring 1. The side wall of the fixing ring 2 is integrally formed with a plurality of evenly distributed sliding rods 1, and the sliding rods 1 correspond one to one with the support rods. A sliding groove 2 is provided on the side wall of the support rod, and the sliding rod 1 is slidably installed inside the sliding groove 2.

[0007] In the above-mentioned reaming equipment for oil mining that is convenient for soil discharge, a motor 1 is fixedly installed on the side wall of the drill bit, a gear 2 is fixedly connected to the output shaft of the motor 1, a gear 1 is fixedly installed on the bottom of the rotating bracket, the gear 1 and the gear 2 are meshed, a spiral groove is provided on the side wall of the lifting slide, a sliding ball is integrally formed inside the fixing ring 1, and the sliding ball is slidably installed inside the spiral groove.

[0008] In the above-mentioned reaming equipment for oil mining that is convenient for soil discharge, a pushing assembly is movably installed below the lifting slide cylinder, and the pushing assembly includes sliding ring 2 and sliding ring 3. The sliding ring 2 and sliding ring 3 are both located inside the rotating bracket, the sliding ring 2 is slidably installed on the inner wall of the rotating bracket, the sliding ring 3 is slidably installed on the outside of the drill bit, and the side wall of the sliding ring 3 is rotatably installed with a number of evenly distributed shifting plates, and the shifting plates are movably installed on the side wall of the sliding ring 2.

[0009] In the above-mentioned hole-expanding equipment for oil mining that is convenient for soil discharge, the inner wall of the rotating bracket is integrally formed with a support plate and a baffle, the baffle is located above the support plate, the sliding ring 2 is slidably installed between the support plate and the baffle, a spring 2 is provided between the sliding ring 2 and the baffle, and a limiting ring is integrally formed inside the sliding ring 2, and the limiting ring is located above the sliding ring 3.

[0010] In the above-mentioned hole-expanding equipment for oil mining that is convenient for soil discharge, a plurality of evenly distributed fan-shaped plates are integrally formed inside the sliding ring 2, the fan-shaped plates correspond to the shift plates one by one, the shift plates and the fan-shaped plates are arranged alternately, a slide groove 3 is formed on the side wall of the fan-shaped plate, a slide rod 2 is integrally formed on the side wall of the shift plate, and the slide rod 2 is slidably installed inside the slide groove 3.

[0011] In the above-mentioned reaming equipment for oil mining that is convenient for soil discharge, a slide cylinder 1 is integrally formed on the top of the sliding ring 3, and the slide cylinder 1 is slidably installed on the outside of the drill bit. An annular locking groove is provided on the outside of the slide cylinder 1, and a movable groove is provided at the bottom of the lifting slide cylinder. A locking block is slidably installed inside the movable groove, and a spring 3 is provided between the locking block and the inner wall of the movable groove. The locking block is slidably installed inside the annular locking groove.

[0012] In the above-mentioned reaming equipment for oil mining that is convenient for soil discharge, a plurality of evenly distributed gears are rotatably mounted at the bottom of the drill bit, a plurality of evenly distributed water spray ports are opened at the bottom of the drill bit, the water spray ports and the gears correspond one to one, and the water spray ports and the gears are staggered at the bottom of the drill bit.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] 1. The present invention cooperates between the sliding ring 2 and the sliding ring 3. During the hole expansion process, when the lifting slide moves downward, the lifting slide locks the slide 1 through the locking block, so that when the lifting slide moves upward, the sliding ring 3 moves upward with the lifting slide. When the sliding ring 3 hits the limit ring, the fan plate and the paddle plate are in the same horizontal plane, and the sliding ring 2 moves upward with the sliding ring 3. At this time, the fan plate and the paddle plate push the mud inside the wellbore, so that the mud flushes the soil and rock debris accumulated on the inner wall of the wellbore through the gushing, and brings out the large particles of rock and soil debris, thereby improving the efficiency of mud discharge during hole expansion.

[0015] 2. The present invention cooperates between the lifting slide and the sliding ring 1. During the hole expansion process, when the top of the lifting slide hits the bottom of the sliding ring 1, the lifting slide drives the sliding ring 1 to move upward, and the sliding ring 1 pushes the support rod, so that the support rod pushes the scraper to move toward the inner wall of the wellbore and hits the inner wall of the wellbore. The fixed ring 2 follows the rotation of the drill bit, so that the scraper rotates on the inner wall of the wellbore and cleans the soil and rock debris accumulated on the inner wall of the wellbore. At the same time, mud is smeared on the inner wall of the wellbore, so that the mud forms a uniform and firm mud skin on the inner wall of the wellbore.

[0016] 3. The present invention cooperates between the sliding ring 1 and the scraper. During the hole expansion process, when the lifting slide slides downward, the sliding ring 1 slides downward and returns to its position due to the resistance of the spring 1. During the return of the sliding ring 1, the sliding ring 1 pulls the support rod, causing the scraper to shrink in the direction away from the inner wall of the wellbore. The fixed ring 2 follows the rotation of the drill bit, and the scraper and the support rod stir the mud inside the wellbore, so that soil and rock chips are always in a flowing state inside the wellbore, thereby avoiding the accumulation of soil and rock chips inside the wellbore to form blockage and precipitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0019] Figure 3 For the present invention Figure 2 The enlarged schematic diagram of point A in the middle;

[0020] Figure 4It is a disassembly schematic diagram of the fixed ring 2 and the sliding ring 1 in the present invention;

[0021] Figure 5 It is a disassembly schematic diagram of the rotating bracket and the lifting slide cylinder in the present invention;

[0022] Figure 6 It is a disassembly schematic diagram of the sliding ring 2 and the sliding ring 3 in the present invention;

[0023] Figure 7 It is a structural schematic diagram of the locking block in the present invention.

[0024] In the figure: 1, drill bit; 11, connecting shaft; 12, gear; 13, water nozzle; 14, support frame; 15, slide groove 1; 21, rotating bracket; 211, gear 1; 212, support plate; 213, baffle; 214, slide ball; 215, fixed ring 1; 22, lifting slide cylinder; 221, motor 1; 222, gear 2; 223, spiral slide groove; 224, movable groove; 225, slider 1; 231, scraper; 232. Support rod; 233. Fixed ring 2; 234. Sliding ring 1; 235. Spring 1; 236. Sliding rod 1; 237. Sliding groove 2; 241. Sliding ring 2; 242. Paddle plate; 243. Sliding ring 3; 244. Fan plate; 245. Sliding groove 3; 246. Spring 2; 247. Sliding rod 2; 248. Sliding cylinder 1; 249. Limiting ring; 251. Locking block; 252. Annular locking groove; 253. Spring 3. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] Reference Figure 1 - Figure 7As shown, a hole-enlarging device for oil mining that is convenient for soil discharge comprises a drill bit 1 and a connecting shaft 11, wherein the connecting shaft 11 is fixedly installed on the top of the drill bit 1 by means of threads, a slide groove 15 is provided on the side wall of the drill bit 1, a lifting slide cylinder 22 is slidably installed on the side wall of the drill bit 1, a slider 225 is integrally formed on the inner wall of the lifting slide cylinder 22, and the slider 225 is slidably installed inside the slide groove 15, a support frame 14 is integrally formed on the side wall of the drill bit 1, a rotating bracket 21 is rotatably installed on the top of the support frame 14, a fixing ring 215 is integrally formed on the top of the rotating bracket 21, and the lifting slide cylinder 22 is rotatably installed inside the fixing ring 215, a motor 221 is fixedly installed on the side wall of the drill bit 1, and a gear 222 is fixedly connected to the output shaft of the motor 221, A gear 211 is fixedly installed at the bottom of the rotating bracket 21, and the gear 211 and the gear 222 are meshed with each other. A spiral groove 223 is opened on the side wall of the lifting slide 22, and a sliding ball 214 is integrally formed inside the fixed ring 215. The sliding ball 214 is slidably installed inside the spiral groove 223. A stirring component is movably installed above the lifting slide 22, and the stirring component includes a scraper 231 and a sliding ring 234. The sliding ring 234 is slidably installed on the outside of the drill bit 1. A number of evenly distributed support rods 232 are rotatably installed on the side wall of the sliding ring 234. The support rods 232 and the scrapers 231 correspond one to one. The scrapers 231 are rotatably installed on the side walls of the support rods 232, and the connection between the scrapers 231 and the support rods 232 is located above the sliding ring 234.

[0028] Among them, the working principle of the lifting slide 22 is: there are two spiral slide grooves 223, the rotation directions of the two spiral slide grooves 223 are opposite, and the head and tail are connected to each other. When the connecting shaft 11 drives the drill bit 1 to rotate, the motor 1 221 is started, and the gear 2 222 drives the rotating bracket 21 to rotate through the meshing transmission with the gear 1 211, so that the drill bit 1 rotates inside the rotating bracket 21, and the lifting slide 22 rotates with the drill bit 1, and the sliding ball 214 slides inside the spiral slide groove 223, so that the lifting slide 22 slides back and forth on the outside of the drill bit 1.

[0029] like Figure 1 , Figure 2 and Figure 4 As shown, a fixing ring 233 is fixedly installed on the side wall of the drill bit 1, and the fixing ring 233 is located above the sliding ring 1 234. A spring 235 is provided between the fixing ring 233 and the sliding ring 1 234. The side wall of the fixing ring 233 is integrally formed with a plurality of evenly distributed sliding rods 1 236. The sliding rods 1 236 and the support rods 232 correspond one to one. A sliding groove 237 is provided on the side wall of the support rod 232, and the sliding rod 1 236 is slidably installed inside the sliding groove 237.

[0030] Among them, the working principle of the sliding ring 234 is: when the lifting slide 22 slides upward, the top of the lifting slide 22 contacts the bottom of the sliding ring 234, so that the lifting slide 22 drives the sliding ring 234 to move upward and squeeze the spring 235. In the process of the sliding ring 234 moving upward, the sliding ring 234 pushes the support rod 232, so that the slide groove 237 slides on the outside of the slide rod 236, and the support rod 232 pushes the scraper 231 to move toward the inner wall of the wellbore and contact the inner wall of the wellbore. The scraper 231 rotates on the inner wall of the wellbore by following the rotation of the drill bit 1 through the fixed ring 233, and cleans the soil and rock debris accumulated on the inner wall of the wellbore, and at the same time applies mud to the inner wall of the wellbore, so that the mud forms a uniform and firm mud skin on the inner wall of the wellbore.

[0031] Further references Figure 1 and Figure 2 To explain, the working principle of the scraper 231 and the support rod 232 is as follows: when the lifting slide 22 slides downward, the sliding ring 234 slides downward and returns to its position due to the resistance of the spring 235. During the process of the sliding ring 234 returning to its position, the sliding ring 234 pulls the support rod 232, so that the scraper 231 shrinks away from the inner wall of the wellbore. At this time, the fixed ring 233 follows the rotation of the drill bit 1, and the scraper 231 and the support rod 232 stir the mud inside the wellbore to prevent soil and rock debris from accumulating inside the wellbore to form blockage and precipitation.

[0032] like Figure 3 , Figure 5 and Figure 6 As shown, a pushing assembly is movably installed below the lifting slide 22, and the pushing assembly includes a sliding ring 241 and a sliding ring 3 243. The sliding ring 241 and the sliding ring 3 243 are both located inside the rotating bracket 21. The sliding ring 241 is slidably installed on the inner wall of the rotating bracket 21, and the sliding ring 3 243 is slidably installed on the outer side of the drill bit 1. The inner wall of the rotating bracket 21 is integrally formed with a support plate 212 and a baffle 213, and the baffle 213 is located above the support plate 212. The sliding ring 241 is slidably installed between the support plate 212 and the baffle 213. A spring 246 is provided between the sliding ring 241 and the baffle 213. A limiting ring 249 is integrally formed inside the sliding ring 241, and the limiting ring 249 is located above the sliding ring 3 243.

[0033] like Figure 3 and Figure 5-Figure 7As shown, a slide cylinder 248 is integrally formed on the top of the sliding ring 3 243, and the slide cylinder 248 is slidably installed on the outside of the drill bit 1. An annular locking groove 252 is provided on the outside of the slide cylinder 248, and a movable groove 224 is provided at the bottom of the lifting slide cylinder 22. A locking block 251 is slidably installed inside the movable groove 224. A spring 3 253 is provided between the locking block 251 and the inner wall of the movable groove 224, and the locking block 251 is slidably installed inside the annular locking groove 252.

[0034] The working principle of the sliding ring three 243 is as follows: when the lifting slide 22 slides downward, the bottom of the lifting slide 22 contacts the top of the slide 1 248, so that the slide 1 248 moves downward. When the slide 1 248 moves to the limit position, the lifting slide 22 continues to move downward. At this time, the locking block 251 contracts. When the locking block 251 slides into the annular locking groove 252, the locking block 251 locks the slide 1 248 through the spring three 253. At this time, the lifting slide 22 moves upward, and the slide 1 248 drives the sliding ring three 243 to follow the lifting slide 22 upward. When the sliding ring 243 hits the limit ring 249, the sliding ring 241 follows the sliding ring 243 to move upward. When the sliding ring 241 hits the baffle 213, the sliding ring 241 and the sliding ring 243 stop moving. At this time, the lifting slide 22 continues to move upward, so that the locking block 251 slides out of the annular locking groove 252, and the slide 1 248 is unlocked. The sliding ring 241 drives the sliding ring 3 243 to slide downward quickly and return to its position through the spring 246. When the sliding ring 241 hits the support plate 212, the sliding ring 3 243 returns to its position by inertia.

[0035] like Figure 3 and Figure 6 As shown, a plurality of evenly distributed paddles 242 are rotatably mounted on the side wall of the sliding ring three 243, and the paddles 242 are movably mounted on the side wall of the sliding ring two 241. A plurality of evenly distributed fan-shaped plates 244 are integrally formed inside the sliding ring two 241, and the fan-shaped plates 244 and the paddles 242 correspond one to one, and the paddles 242 and the fan-shaped plates 244 are arranged alternately, and a sliding groove three 245 is provided on the side wall of the fan-shaped plate 244, and a sliding rod two 247 is integrally formed on the side wall of the paddle plate 242, and the sliding rod two 247 is slidably mounted inside the sliding groove three 245.

[0036] Among them, the working principle of the fan-shaped plate 244 and the dial plate 242 is: when the slide cylinder 1 248 is locked, the sliding ring 3 243 drives the dial plate 242 to move upward, and the sliding rod 247 slides inside the sliding groove 3 245, so that the dial plate 242 moves toward the inner wall of the sliding ring 241; when the sliding ring 3 243 hits the limit ring 249, the fan-shaped plate 244 and the dial plate 242 are in the same horizontal plane, and at this time, the sliding ring 241 follows the sliding ring 3 243 to move upward, and the fan-shaped plate 244 and the dial plate 242 push the mud inside the wellbore upward, so that the mud gushes inside the wellbore, and the upwardly gushing mud flushes the inner wall of the wellbore, clears the blockage formed by the accumulation of soil and rock debris, and brings out large particles of rock and soil debris, while flushing the mud skin to increase the thickness of the mud skin.

[0037] like Figure 1 and Figure 2 As shown, a plurality of evenly distributed cones 12 are rotatably mounted at the bottom of the drill bit 1, and a plurality of evenly distributed water spray ports 13 are opened at the bottom of the drill bit 1. The water spray ports 13 correspond to the cones 12 one by one, and the water spray ports 13 and the cones 12 are alternately arranged at the bottom of the drill bit 1.

[0038] The specific working principle and use method of the present invention are explained in detail below: when the connecting shaft 11 drives the drill bit 1 to rotate, the motor 221 is started, so that the drill bit 1 rotates inside the rotating bracket 21, and the lifting slide 22 rotates along with the drill bit 1, and the sliding ball 214 slides inside the spiral slide groove 223, so that the lifting slide 22 moves up and down reciprocatingly, and when the lifting slide 22 moves upward, the lifting slide 22 abuts against the sliding ring 234, so that the scraper 231 moves toward the inner wall of the wellbore and abuts against the inner wall of the wellbore, so that the scraper 231 scrapes away the soil and rock debris accumulated on the inner wall of the wellbore, and smears mud on the inner wall of the wellbore to form a mud skin. When the lifting slide 22 moves downward, the lifting slide 22 locks the slide 1 248 through the locking block 251, so that the lifting slide 22 drives the sliding ring 241 and the sliding ring 3 243 to move upward during the upward movement, and pushes the mud inside the wellbore through the fan plate 244 and the paddle plate 242, so that the mud flushes the accumulated soil and rock debris on the inner wall of the wellbore through the gushing, and brings out large particles of rock and soil debris, thereby improving the efficiency of mud discharge during hole expansion.

[0039] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hole-enlarging device for oil mining that facilitates soil removal, comprising a drill bit (1) and a connecting shaft (11), characterized in that: The connecting shaft (11) is fixedly mounted on the top of the drill bit (1) by means of a thread, a slide groove (15) is provided on the side wall of the drill bit (1), a lifting slide cylinder (22) is slidably mounted on the side wall of the drill bit (1), a slider (225) is integrally formed on the inner wall of the lifting slide cylinder (22), and the slider (225) is slidably mounted inside the slide groove (15), a support frame (14) is integrally formed on the side wall of the drill bit (1), a rotating bracket (21) is rotatably mounted on the top of the supporting bracket (14), a fixing ring (215) is integrally formed on the top of the rotating bracket (21), and the lifting slide cylinder (22) is integrally formed with the inner wall of the lifting slide cylinder (22). ) is rotatably mounted inside a fixed ring (215); a stirring assembly is movably mounted above the lifting slide cylinder (22); the stirring assembly comprises a scraper (231) and a sliding ring (234); the sliding ring (234) is slidably mounted on the outside of the drill bit (1); a plurality of evenly distributed support rods (232) are rotatably mounted on the side wall of the sliding ring (234); the support rods (232) and the scrapers (231) correspond one to one; the scrapers (231) are rotatably mounted on the side walls of the support rods (232); and the connection between the scrapers (231) and the support rods (232) is located above the sliding ring (234).

2. According to claim 1, a hole enlarging device for oil mining that is convenient for soil discharge, characterized in that: A second fixing ring (233) is fixedly installed on the side wall of the drill bit (1), and the second fixing ring (233) is located above the first sliding ring (234). A spring (235) is provided between the second fixing ring (233) and the first sliding ring (234). The side wall of the second fixing ring (233) is integrally formed with a plurality of evenly distributed sliding rods (236). The sliding rods (236) and the support rods (232) correspond one to one. The side wall of the support rod (232) is provided with a second sliding groove (237), and the sliding rod (236) is slidably installed inside the second sliding groove (237).

3. The hole enlarging device for oil mining that facilitates soil discharge according to claim 1, characterized in that: A motor 1 (221) is fixedly mounted on the side wall of the drill bit (1), and a gear 2 (222) is fixedly connected to the output shaft of the motor 1 (221). A gear 1 (211) is fixedly mounted on the bottom of the rotating bracket (21), and the gear 1 (211) and the gear 2 (222) are meshed with each other. A spiral groove (223) is provided on the side wall of the lifting slide cylinder (22), and a sliding ball (214) is integrally formed inside the fixing ring 1 (215), and the sliding ball (214) is slidably mounted inside the spiral groove (223).

4. The hole enlarging device for oil mining that facilitates soil discharge according to claim 1, characterized in that: A pushing assembly is movably mounted below the lifting slide cylinder (22), and the pushing assembly comprises a second sliding ring (241) and a third sliding ring (243). Both the second sliding ring (241) and the third sliding ring (243) are located inside the rotating bracket (21). The second sliding ring (241) is slidably mounted on the inner wall of the rotating bracket (21), and the third sliding ring (243) is slidably mounted on the outer side of the drill bit (1). A plurality of evenly distributed shifting plates (242) are rotatably mounted on the side wall of the third sliding ring (243), and the shifting plates (242) are movably mounted on the side wall of the second sliding ring (241).

5. The hole enlarging device for oil mining that facilitates soil discharge according to claim 4, characterized in that: The inner wall of the rotating bracket (21) is integrally formed with a supporting plate (212) and a baffle (213), the baffle (213) is located above the supporting plate (212), the second sliding ring (241) is slidably installed between the supporting plate (212) and the baffle (213), a second spring (246) is provided between the second sliding ring (241) and the baffle (213), and a limiting ring (249) is integrally formed inside the second sliding ring (241), and the limiting ring (249) is located above the third sliding ring (243).

6. The hole enlarging device for oil mining that facilitates soil discharge according to claim 4, characterized in that: The interior of the sliding ring 2 (241) is integrally formed with a plurality of evenly distributed fan-shaped plates (244), the fan-shaped plates (244) and the shift plates (242) correspond one to one, the shift plates (242) and the fan-shaped plates (244) are arranged alternately, the side wall of the fan-shaped plate (244) is provided with a sliding groove 3 (245), the side wall of the shift plate (242) is integrally formed with a sliding rod 2 (247), and the sliding rod 2 (247) is slidably installed inside the sliding groove 3 (245).

7. The hole enlarging device for oil mining that facilitates soil discharge according to claim 4, characterized in that: The top of the sliding ring three (243) is integrally formed with a slide cylinder one (248), and the slide cylinder one (248) is slidably installed on the outside of the drill bit (1). The outside of the slide cylinder one (248) is provided with an annular locking groove (252). The bottom of the lifting slide cylinder (22) is provided with a movable groove (224), and a locking block (251) is slidably installed inside the movable groove (224). A spring three (253) is provided between the locking block (251) and the inner wall of the movable groove (224), and the locking block (251) is slidably installed inside the annular locking groove (252).

8. The hole enlarging device for oil mining that facilitates soil discharge according to claim 1, characterized in that: A plurality of evenly distributed cones (12) are rotatably mounted at the bottom of the drill bit (1), a plurality of evenly distributed water spray ports (13) are opened at the bottom of the drill bit (1), the water spray ports (13) and the cones (12) correspond one to one, and the water spray ports (13) and the cones (12) are arranged alternately at the bottom of the drill bit (1).

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