Synchronous well cementation type radial horizontal well drill bit and working method thereof

Abstract

The invention discloses a synchronous well cementation type radial horizontal well drill bit, and relates to the technical field of well drilling drill bits, the drill bit comprises a drill bit main body, the drill bit main body comprises an operation end, the top of the operation end is provided with a connecting shaft leading into the operation end, the connecting shaft is of a hollow structure, and the tail end of the connecting shaft is connected with a cutting end. The inner cutting teeth and the outer cutting teeth cut rock chippings, so that drilling is conducted, water is injected into a liquid inlet pipe, water flow is injected into the cutting end, a stratum becomes muddy water after meeting water, the drill bit body discharges the muddy water, after work of the drill bit body is completed, well cementation cement is injected, and the check pad seals the control shaft under the pressure effect; well cementation cement can only flow out from the through hole in the outer wall of the control shaft, the gap between the outer wall of the protective cover and the inner wall of a drilling well is gradually filled with the well cementation cement, after pouring is completed, the drill bit body is separated from the protective cover, and the well cementation cement and the protective cover form a retaining wall together with solidification of the well cementation cement, so that the inner wall of the drilling well is prevented from collapsing. And the exploration work safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of drilling bits, and in particular to a synchronous cementing radial horizontal well drill bit and a working method thereof. Background Art

[0002] The drilling bit is one of the important tools used for drilling. It plays an important role in geological exploration and resource exploration. The drill bit is driven into the ground to form a borehole through continuous rotation. A horizontal well refers to a well with an inclination angle of or close to 90° and a well body drilled in a horizontal direction for a certain length.

[0003] Radial horizontal wells, also known as ultra-short radius radial horizontal wells, have solved the problems of high water injection pressure in old oil fields and low recovery rate of marginal wells. With its high single well production and low crude oil production cost, radial wells have become the leading technology in crude oil production in the world. The radial horizontal well technology includes two processes: casing window opening and bottom drilling. The principle is to first use a window opening drill bit to open a hole in the casing at the oil and gas layer, and then use the hydraulic jet effect of high-pressure jets and the rotary crushing effect of a small drill bit to crush the formation.

[0004] The horizontal well drill bit is the main tool for horizontal well construction. During drilling construction, as the construction depth increases, the last section of the drilling usually needs to withstand greater pressure, especially when drilling into unstable formations, such as coal seams and non-diagenetic natural gas hydrate formations, the well wall is particularly prone to collapse. In order to ensure the stability of drilling, it is necessary to set up a retaining wall or pour cementing cement on the inner wall of the well to retain the soil and bear the pressure of drilling, so that the well wall is not easy to collapse. When setting up a retaining wall in the existing technology, the drill bit needs to be withdrawn and then the cementing cement is poured. However, after the drill bit is withdrawn, the inner wall of the well suddenly loses the support of the drill bit, which will cause a sudden change in the pressure of the inner wall of the well. The cast-in-place cementing cement takes time to solidify and cannot support the well wall in time, which is easy to cause the well wall to collapse, thereby causing a safety accident. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a synchronous cementing radial horizontal well drill bit and a working method thereof.

[0006] The synchronous cementing radial horizontal well drill bit proposed by the present invention comprises a drill bit body, the drill bit body comprises an operating end, a connecting shaft passing into the operating end is arranged at the top of the operating end, the connecting shaft is a hollow structure, a cutting end is connected to the end of the connecting shaft, and an inner cutting tooth is arranged at an equal distance on the outer wall of the bottom of the cutting end, and the inner cutting tooth is arranged in a ring shape, a protective cover is clamped on the outer wall of the drill bit body, the protective cover is adapted to the drill bit body, a protective ring is arranged at the bottom of the protective cover, the diameter of the protective ring is larger than the diameter of the protective cover, and outer cutting teeth are arranged at an equal distance around the outer wall of the bottom of the protective ring, a control shaft inserted into the connecting shaft is arranged on the outer wall of the top of the drill bit body, and the control shaft is a hollow structure, a liquid inlet pipe passing into the interior of the drill bit body is arranged on the outer wall of the top of the drill bit body, and the end of the liquid inlet pipe passes into the interior of the control shaft, a one-way water inlet valve is installed on the liquid inlet pipe, a rotating joint is arranged on the top of the liquid inlet pipe, the rotating joint is rotatably connected to the liquid inlet pipe, and the outer wall of the protective ring is provided with protective rings distributed at equal distances.

[0007] Preferably, the inner wall of the control shaft is hinged with a check pad, the outer wall of the control shaft is hinged with equidistantly distributed baffles, the baffles are circular, and the outer wall of the control shaft is provided with equidistantly distributed through holes, the size of the through holes is smaller than the size of the baffles.

[0008] Preferably, a sealing ring is provided on the outer wall of the baffle plate close to the through hole, the sealing ring is adapted to the through hole, a support block is provided on the inner wall of the control shaft, the support block is located below the check pad, the support block is arc-shaped, and the liquid inlet pipe is located below the support block.

[0009] Preferably, the outer wall of the operating end is provided with casting holes which are distributed at equal distances, the horizontal height of the casting holes is lower than the height of the through holes, and the casting holes are located above the protective ring.

[0010] Preferably, the bottom of the inner wall of the protective ring is provided with control grooves distributed at equal distances, the control groove is arranged in a ring shape, a control block is slidably installed on the inner wall of the control groove, the end of the control block is circular, a fixing spring is welded to the inner wall of the control groove, and the end of the fixing spring is connected to the control block.

[0011] Preferably, the outer wall of the cutting end is provided with limit grooves distributed at equal distances, the limit grooves are adapted to the control block, the limit grooves are semicircular, a limit block is welded on the outer wall of the bottom of the protective ring, the limit block is adapted to the inner cutting teeth, and the width of the limit block is the same as the gap between the inner cutting teeth.

[0012] Preferably, a connecting piece is provided on the outer wall at the bottom of the connecting shaft, and the connecting piece is a circular structure. A slot is provided on the outer wall at the top of the cutting end, and the slot is adapted to the connecting piece.

[0013] Preferably, the outer wall of the connecting member is provided with mounting holes distributed at equal distances, and the outer wall of the cutting end is threadedly mounted with fixing bolts distributed at equal distances, and the fixing bolts are adapted to the mounting holes.

[0014] Preferably, the bottom outer wall of the connecting shaft and the top outer wall of the cutting end are both provided with sealing strips, and the sealing strips are respectively matched with the connecting shaft and the cutting end.

[0015] The working method of the synchronous cementing radial horizontal well drill bit comprises the following steps:

[0016] S1: Before working, the drill bit body is inserted into the protective cover to connect the drill bit body and the protective cover to complete the assembly of the device. After the assembly is completed, the device is connected to the drilling equipment through the control shaft on the top of the drill bit body. After the connection is completed, the drilling equipment drives the drill bit to drill down to the bottom of the well;

[0017] S2: The drilling equipment drives the drill bit body to rotate to drill the well. When the drill bit body rotates, the inner cutting teeth on the cutting end at the bottom thereof and the outer cutting teeth at the bottom of the protective ring rotate together to cut the rock debris to drill. During drilling, the liquid inlet pipe injects water into the control shaft, and the water flows into the cutting end along the connecting shaft. The rock debris turns into muddy water after meeting the water. Then, the muddy water is pumped to the ground along the control shaft through the drill bit body to discharge the rock debris generated during the drilling process. When the muddy water rises, the check pad opens under the action of suction, and at the same time, the baffle on the outer wall of the control shaft is firmly adsorbed on the outer wall of the control shaft under the action of suction to prevent the muddy water from seeping out of the through hole.

[0018] S3: After the main body of the drill bit is finished working, cementing cement is injected into the main body of the drill bit through the control shaft. The check pad inside the control shaft seals the control shaft under pressure, and the cementing cement cannot enter the connecting shaft. The cementing cement can only flow out from the through hole on the outer wall of the control shaft and then from the casting hole. As the cementing cement gradually fills the gap between the outer wall of the protective cover and the inner wall of the well, after the casting is completed, the drill bit body and the protective cover are separated. As the cementing cement solidifies, the cementing cement and the protective cover together form a retaining wall, thereby preventing the inner wall of the well from collapsing and improving the safety of the exploration work;

[0019] S4: When the drill body is separated from the protective cover, the drill body is directly pulled out from the protective cover. As the drill body rises, the cutting end squeezes the control block, and the control block retracts to the inner wall of the control groove under the pressure, so that the cutting end is separated from the protective cover, and then the drill body is taken out;

[0020] S5: After the drill bit body is taken out, water is poured into the drill bit body through the liquid inlet pipe and the control shaft to clean the drill bit, and the mud and cement adhering to the inside of the drill bit are flushed out to complete the cleaning of the drill bit.

[0021] The beneficial effects of the present invention are:

[0022] 1. In the present invention, the drilling tool drives the drill bit body to drill into the reservoir. When the drill bit body rotates, the inner cutting teeth and the outer cutting teeth rotate together to cut the formation to drill. During drilling, the liquid inlet pipe injects water into the control shaft, and the water flows into the cutting end along the connecting shaft. The formation turns into muddy water after meeting water. Then, the muddy water is pumped to the ground along the control shaft through the drill bit body to discharge the rock debris generated during the drilling process. The check pad is opened under the action of suction, and at the same time, the baffle on the outer wall of the control shaft is firmly adsorbed on the outer wall of the control shaft under the action of suction to prevent muddy water from After the drill bit body is finished working, cementing cement is injected into the drill bit body through the control shaft. The check pad inside the control shaft seals the control shaft under pressure, and the cementing cement cannot enter the connecting shaft. The cementing cement can only flow out from the through hole on the outer wall of the control shaft. As the cementing cement gradually fills the gap between the outer wall of the protective cover and the inner wall of the well, after the pouring is completed, the drill bit body is separated from the protective cover. As the cementing cement solidifies, the cementing cement and the protective cover together form a retaining wall, thereby preventing the inner wall of the well from collapsing and improving the safety of exploration work.

[0023] 2. The sealing ring seals the through hole to prevent mud and water from overflowing from the connection gap between the baffle and the control shaft. At the same time, the baffle is hinged to the outer wall of the control shaft. When pouring cement, the cementing cement can push the baffle open to facilitate the overflow of cementing cement. During pouring, the cementing cement overflows from the pouring hole and gradually fills the gap between the protective cover and the inner wall of the well. As the cementing cement solidifies, the protective cover and the cementing cement form a retaining wall together. Since the protective cover is made of metal, the cementing cement is not easy to collapse and can be formed faster. After forming, the cementing cement provides the first support and the protective cover provides the second support. The two supports cooperate with each other to resist stronger drilling pressure and the well is not easy to collapse.

[0024] 3. When the drill bit body is separated from the protective cover, as the drill bit body rises, the outer wall of the drill bit body gradually squeezes the control block, and the control block retracts into the control groove under the action of pressure, thereby releasing the restriction of the control block on the drill bit body, and the drill bit body can be directly taken out. After the drill bit body is taken out, water is poured into the drill bit body through the liquid inlet pipe and the control axis to clean the drill bit, flush out the mud and cement attached to the inside of the drill bit, and complete the cleaning of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the main appearance structure of the synchronous cementing radial horizontal well drill bit and its working method proposed by the present invention;

[0026] Figure 2 A schematic diagram of the external structure of the drill bit body of the synchronous cementing radial horizontal well drill bit and the working method thereof proposed by the present invention;

[0027] Figure 3 A schematic diagram of the internal structure of the operating end of the synchronous cementing radial horizontal well drill bit and the working method thereof proposed by the present invention;

[0028] Figure 4 A schematic diagram of the limit groove structure of the synchronous cementing radial horizontal well drill bit and the working method thereof proposed by the present invention;

[0029] Figure 5 A schematic diagram of the bottom structure of the synchronous cementing radial horizontal well drill bit and its working method proposed by the present invention;

[0030] Figure 6 A schematic diagram of the connector structure of the synchronous cementing radial horizontal well drill bit and its working method proposed by the present invention;

[0031] Figure 7 A schematic diagram of the internal cutting tooth structure of the synchronous cementing radial horizontal well drill bit and its working method proposed in the present invention.

[0032] In the figure: 1. drill bit body; 2. operating end; 3. connecting shaft; 4. cutting end; 5. internal cutting teeth; 6. protective cover; 7. protective ring; 8. external cutting teeth; 9. control shaft; 10. liquid inlet pipe; 11. one-way water inlet valve; 12. check pad; 13. baffle; 14. support block; 15. casting hole; 16. control groove; 17. control block; 18. fixing spring; 19. limit groove; 20. limit block; 21. protective ring; 22. connecting piece; 23. slot; 24. mounting hole; 25. fixing bolt; 26. sealing strip. DETAILED DESCRIPTION

[0033] 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.

[0034] Example, see Figure 1-7The synchronous cementing radial horizontal well drill bit comprises a drill bit body 1, the drill bit body 1 comprises an operating end 2, a connecting shaft 3 passing through the operating end 2 is arranged at the top of the operating end 2, the connecting shaft 3 is a hollow structure, a cutting end 4 is connected to the end of the connecting shaft 3, and an inner cutting tooth 5 distributed at equal distances is arranged on the outer wall of the bottom of the cutting end 4, and the inner cutting tooth 5 is arranged in a ring shape, a protective cover 6 is clamped on the outer wall of the drill bit body 1, the protective cover 6 is adapted to the drill bit body 1, a protective ring 7 is arranged at the bottom of the protective cover 6, the diameter of the protective ring 7 is larger than the diameter of the protective cover 6, and the outer wall of the bottom of the protective ring 7 is arranged with outer cutting teeth 8 distributed at equal distances, and an insert is arranged on the outer wall of the top of the drill bit body 1 A control shaft 9 of the connecting shaft 3 has a hollow structure. A liquid inlet pipe 10 which passes into the interior of the drill bit body 1 is arranged on the top outer wall of the drill bit body 1. The end of the liquid inlet pipe 10 passes into the interior of the control shaft 9. A one-way water inlet valve 11 is installed on the liquid inlet pipe 10. A rotating joint is arranged on the top of the liquid inlet pipe 10. The rotating joint is rotatably connected to the liquid inlet pipe 10. The outer wall of the protective ring 7 is provided with equidistantly distributed protective rings 21. A check pad 12 is hinged on the inner wall of the control shaft 9. Equidistantly distributed baffles 13 are hinged on the outer walls around the control shaft 9. The baffle 13 is circular. Equidistantly distributed through holes are opened on the outer wall of the control shaft 9. The size of the through holes is smaller than that of the baffle 13.

[0035] By means of the above structure: when working, before working, the drill bit body 1 is inserted into the protective cover 6 so as to connect the drill bit body 1 with the protective cover 6 to complete the assembly of the device. After the assembly is completed, the device is connected to the drilling equipment through the control shaft 9 on the top of the drill bit body 1. After the connection is completed, the drilling equipment drives the drill bit to drill into the reservoir, and the drilling equipment drives the drill bit body 1 to rotate to drill the well. When the drill bit body 1 rotates, the inner cutting teeth 5 on the cutting end 4 at the bottom thereof and the outer cutting teeth 8 at the bottom of the protective ring 7 rotate together to cut the rock fragments to drill. When drilling, the liquid inlet pipe 10 injects water into the control shaft 9, and the water flows into the cutting end 4 along the connecting shaft 3. The formation becomes muddy water after meeting water, and then the muddy water is pumped to the ground along the control shaft 9 through the drill bit body 1, thereby drilling the well. The rock debris generated by the drilling process is discharged. When the mud and water rise, the check pad 12 opens under the action of suction, and at the same time, the baffle 13 on the outer wall of the control shaft 9 is firmly adsorbed on the outer wall of the control shaft 9 under the action of suction to prevent mud and water from seeping out of the through hole. After the drill bit body 1 is completed, cementing cement is injected into the inside of the drill bit body 1 through the control shaft 9. The check pad 12 inside the control shaft 9 closes the control shaft 9 under pressure, and the cementing cement cannot enter the connecting shaft 3. The cementing cement can only flow out from the through hole on the outer wall of the control shaft 9. As the cementing cement gradually fills the gap between the outer wall of the protective cover 6 and the inner wall of the well, after the pouring is completed, the drill bit body 1 is separated from the protective cover 6. As the cementing cement solidifies, the cementing cement and the protective cover 6 form a retaining wall together, thereby preventing the inner wall of the well from collapsing and improving the safety of the exploration work.

[0036] As a preferred implementation of this embodiment, a sealing ring is provided on the outer wall of the baffle 13 close to the through hole, and the sealing ring is adapted to the through hole. A support block 14 is provided on the inner wall of the control shaft 9. The support block 14 is located below the check pad 12. The support block 14 is arc-shaped. The liquid inlet pipe 10 is located below the support block 14. The sealing ring seals the through hole to prevent mud and water from overflowing from the connecting gap between the baffle 13 and the control shaft 9. At the same time, the baffle 13 is hinged to the outer wall of the control shaft 9. When cementing is poured, the cementing cement can push the baffle 13 open to facilitate the overflow of cementing cement.

[0037] As a preferred implementation mode of this embodiment, the outer wall of the operating end 2 is provided with equally distributed casting holes 15, the horizontal height of the casting holes 15 is lower than the height of the through hole, and the casting holes 15 are located above the protective ring 7. During casting, cementing cement overflows from the casting holes 15 and gradually fills the gap between the protective cover 6 and the inner wall of the well. As the cementing cement solidifies, the protective cover 6 and the cementing cement form a retaining wall together. Since the protective cover 6 is made of metal, the cementing cement is not easy to collapse and can be formed faster. After forming, the cementing cement provides the first support and the protective cover 6 provides the second support. The two supports cooperate with each other to resist stronger drilling pressure and the well is not easy to collapse.

[0038] As a preferred implementation of this embodiment, the bottom of the inner wall of the protective ring 7 is provided with control grooves 16 distributed at equal distances, the control grooves 16 are arranged in an annular shape, a control block 17 is slidably installed on the inner wall of the control groove 16, the end of the control block 17 is circular, a fixing spring 18 is welded on the inner wall of the control groove 16, and the end of the fixing spring 18 is connected to the control block 17, and the outer wall of the cutting end 4 is provided with limit grooves 19 distributed at equal distances, the limit grooves 19 are adapted to the control block 17, the limit grooves 19 are semicircular, and the outer wall of the bottom of the protective ring 7 A limit block 20 is welded on the wall, and the limit block 20 is adapted to the inner cutting tooth 5. The width of the limit block 20 is the same as the gap between the inner cutting teeth 5. The protective ring 7 blocks the cementing cement to prevent the cementing cement from flowing to the bottom of the drill bit and affecting the work. When the drill bit body 1 is separated from the protective cover 6, as the drill bit body 1 rises, the outer wall of the drill bit body 1 gradually squeezes the control block 17, and the control block 17 retracts into the control groove 16 under the action of pressure, thereby releasing the restriction of the control block 17 on the drill bit body 1, and the drill bit body 1 can be directly taken out.

[0039] As a preferred implementation manner of this embodiment, a connecting piece 22 is provided on the bottom outer wall of the connecting shaft 3, and the connecting piece 22 is a circular structure. A slot 23 is provided on the top outer wall of the cutting end 4, and the slot 23 is adapted to the connecting piece 22. The outer wall of the connecting piece 22 is provided with mounting holes 24 distributed at equal distances. The outer wall of the cutting end 4 is threadedly installed with fixing bolts 25 distributed at equal distances, and the fixing bolts 25 are adapted to the mounting holes 24. The bottom outer wall of the connecting shaft 3 and the top outer wall of the cutting end 4 are both provided with sealing strips 26, and the sealing strips 26 are respectively adapted to the connecting shaft 3 and the cutting end 4. The connecting shaft 3 and the cutting end 4 are connected to the slot 23 through the connecting piece 22. After the drill body 1 is completed, the fixing bolts 25 can be removed to clean the inside of the cutting end 4 and the inside of the connecting shaft 3, which is more convenient to use.

[0040] The working method of the synchronous cementing radial horizontal well drill bit comprises the following steps:

[0041] S1: Before working, the drill bit body 1 is inserted into the protective cover 6 to connect the drill bit body 1 with the protective cover 6 to complete the assembly of the device. After the assembly is completed, the device is connected to the drilling equipment through the control shaft 9 on the top of the drill bit body 1. After the connection is completed, the drilling equipment drives the drill bit to drill down to the bottom of the well;

[0042] S2: The drilling equipment drives the drill bit body 1 to rotate to drill the well. When the drill bit body 1 rotates, the inner cutting teeth 5 on the cutting end 4 at the bottom thereof and the outer cutting teeth 8 at the bottom of the protective ring 7 rotate together to cut the rock fragments to drill. During drilling, the liquid inlet pipe 10 injects water into the control shaft 9, and the water flows into the cutting end 4 along the connecting shaft 3. The rock fragments turn into muddy water after meeting the water. Then, the muddy water is pumped to the ground along the control shaft 9 through the drill bit body 1 to discharge the rock fragments generated during the drilling process. When the muddy water rises, the check pad 12 is opened under the action of suction, and at the same time, the baffle 13 on the outer wall of the control shaft 9 is firmly adsorbed on the outer wall of the control shaft 9 under the action of suction to prevent the muddy water from seeping out of the through hole;

[0043] S3: After the drill bit body 1 is finished working, cementing cement is injected into the drill bit body 1 through the control shaft 9. The check pad 12 inside the control shaft 9 closes the control shaft 9 under pressure, and the cementing cement cannot enter the connecting shaft 3. The cementing cement can only flow out from the through hole on the outer wall of the control shaft 9 and then from the casting hole 15. As the cementing cement gradually fills the gap between the outer wall of the protective cover 6 and the inner wall of the well, after the casting is completed, the drill bit body 1 is separated from the protective cover 6. As the cementing cement solidifies, the cementing cement and the protective cover 6 together form a retaining wall, thereby preventing the inner wall of the well from collapsing and improving the safety of the exploration work;

[0044] S4: When the drill body 1 is separated from the protective cover 6, the drill body 1 is directly pulled out from the protective cover 6. As the drill body 1 rises, the cutting end 4 presses the control block 17, and the control block 17 retracts to the inner wall of the control groove 16 under the pressure, so that the cutting end 4 is separated from the protective cover 6, and then the drill body 1 is taken out;

[0045] S5: After the drill bit body 1 is taken out, water is poured into the drill bit body 1 through the liquid inlet pipe 10 and the control shaft 9 to clean the drill bit, flush out the muddy water and cementing cement attached to the inside of the drill bit, and complete the cleaning of the drill bit.

[0046] In the present invention, before working, the drill bit body 1 is inserted into the protective cover 6 so as to connect the drill bit body 1 with the protective cover 6 to complete the assembly of the device. After the assembly is completed, the device is connected to the drilling equipment through the control shaft 9 on the top of the drill bit body 1. After the connection is completed, the drilling equipment drives the drill bit to drill the reservoir, and the drilling equipment drives the drill bit body 1 to rotate to drill the well. When the drill bit body 1 rotates, the inner cutting teeth 5 on the cutting end 4 at the bottom thereof and the outer cutting teeth 8 at the bottom of the protective ring 7 rotate together to cut the rock debris to drill. During drilling, the liquid inlet pipe 10 injects water into the control shaft 9, and the water flows into the cutting end 4 along the connecting shaft 3. The formation becomes muddy water after meeting water, and then the muddy water is pumped to the ground along the control shaft 9 through the drill bit body 1, thereby completing the drilling process. The generated rock debris is discharged, and when the muddy water rises, the check pad 12 opens under the action of suction, and at the same time, the baffle 13 on the outer wall of the control shaft 9 is firmly adsorbed on the outer wall of the control shaft 9 under the action of suction to prevent muddy water from seeping out from the through hole. After the work of the drill bit body 1 is completed, cementing cement is injected into the inside of the drill bit body 1 through the control shaft 9. The check pad 12 inside the control shaft 9 closes the control shaft 9 under the action of pressure, and the cementing cement cannot enter the connecting shaft 3. The cementing cement can only flow out from the through hole on the outer wall of the control shaft 9. As the cementing cement gradually fills the gap between the outer wall of the protective cover 6 and the inner wall of the well, after the pouring is completed, the drill bit body 1 is separated from the protective cover 6. As the cementing cement solidifies, the cementing cement and the protective cover 6 together form a retaining wall, thereby preventing the inner wall of the well from collapsing and improving the safety of the exploration work.

[0047] The sealing ring seals the through hole to prevent mud and water from overflowing from the connection gap between the baffle plate 13 and the control shaft 9. At the same time, the baffle plate 13 is hinged to the outer wall of the control shaft 9. When pouring cement, the cement can push the baffle plate 13 open to facilitate the overflow of cement. During pouring, the cement overflows from the pouring hole 15 to gradually fill the gap between the protective cover 6 and the inner wall of the well. As the cement solidifies, the protective cover 6 and the cement form a retaining wall together. Since the protective cover 6 is made of metal, the cement is not easy to collapse and can be formed faster. After forming, the cement provides the first support and the protective cover 6 provides the second support. The two supports cooperate with each other to resist stronger drilling pressure and the well is not easy to collapse.

[0048] When the drill bit body 1 is separated from the protective cover 6, as the drill bit body 1 rises, the outer wall of the drill bit body 1 gradually squeezes the control block 17, and the control block 17 retracts into the control groove 16 under the action of pressure, thereby releasing the restriction of the control block 17 on the drill bit body 1, and the drill bit body 1 can be directly taken out. After the drill bit body 1 is taken out, water is poured into the drill bit body 1 through the liquid inlet pipe 10 and the control shaft 9 to clean the drill bit, and the mud and cement attached to the inside of the drill bit are flushed out to complete the cleaning of the drill bit.

[0049] 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 synchronous cementing radial horizontal well drill bit, comprising a drill bit body (1), characterized in that: The drill bit body (1) comprises an operating end (2), the top of the operating end (2) is provided with a connecting shaft (3) passing through the operating end (2), the connecting shaft (3) is a hollow structure, the end of the connecting shaft (3) is connected to a cutting end (4), the bottom outer wall of the cutting end (4) is provided with inner cutting teeth (5) distributed at equal distances, the inner cutting teeth (5) are arranged in an annular shape, the outer wall of the drill bit body (1) is clamped with a protective cover (6), the protective cover (6) is adapted to the drill bit body (1), the bottom of the protective cover (6) is provided with a protective ring (7), the diameter of the protective ring (7) is larger than the diameter of the protective cover (6), and the protective ring (7) External cutting teeth (8) are arranged at equal distances around the bottom outer wall. A control shaft (9) inserted into the connecting shaft (3) is arranged on the top outer wall of the drill bit body (1). The control shaft (9) is a hollow structure. A liquid inlet pipe (10) is arranged on the top outer wall of the drill bit body (1) and is passed into the interior of the drill bit body (1). The end of the liquid inlet pipe (10) is passed into the interior of the control shaft (9). A one-way water inlet valve (11) is installed on the liquid inlet pipe (10). A rotating joint is arranged on the top of the liquid inlet pipe (10). The rotating joint is rotatably connected to the liquid inlet pipe (10). The outer wall of the protective ring (7) is provided with protective rings (21) distributed at equal distances.

2. The synchronous cementing radial horizontal well drill bit according to claim 1, characterized in that: The inner wall of the control shaft (9) is hinged with a check pad (12), and the outer walls around the control shaft (9) are hinged with baffles (13) distributed at equal distances, the baffles (13) are circular, and the outer wall of the control shaft (9) is provided with through holes distributed at equal distances, and the size of the through holes is smaller than the size of the baffles (13).

3. The synchronous cementing radial horizontal well drill bit according to claim 2, characterized in that: A sealing ring is provided on the outer wall of the baffle (13) close to the through hole, and the sealing ring is adapted to the through hole. A support block (14) is provided on the inner wall of the control shaft (9), and the support block (14) is located below the check pad (12). The support block (14) is arc-shaped, and the liquid inlet pipe (10) is located below the support block (14).

4. The synchronous cementing radial horizontal well drill bit according to claim 3, characterized in that: The outer wall of the operating end (2) is provided with pouring holes (15) distributed at equal distances, the horizontal height of the pouring holes (15) is lower than the height of the through holes, and the pouring holes (15) are located above the protective ring (7).

5. The synchronous cementing radial horizontal well drill bit according to claim 1, characterized in that: The bottom of the inner wall of the protective ring (7) is provided with control grooves (16) distributed at equal distances. The control groove (16) is arranged in an annular shape. A control block (17) is slidably mounted on the inner wall of the control groove (16). The end of the control block (17) is circular. A fixing spring (18) is welded to the inner wall of the control groove (16). The end of the fixing spring (18) is connected to the control block (17).

6. The synchronous cementing radial horizontal well drill bit according to claim 5, characterized in that: The outer wall of the cutting end (4) is provided with limit grooves (19) distributed at equal distances, the limit grooves (19) are matched with the control block (17), the limit grooves (19) are semicircular, the outer wall of the bottom of the protective ring (7) is welded with a limit block (20), the limit block (20) is matched with the inner cutting teeth (5), and the width of the limit block (20) is the same as the gap between the inner cutting teeth (5).

7. The synchronous cementing radial horizontal well drill bit according to claim 1, characterized in that: A connecting piece (22) is provided on the outer wall at the bottom of the connecting shaft (3), and the connecting piece (22) is a circular structure. A slot (23) is provided on the outer wall at the top of the cutting end (4), and the slot (23) is adapted to fit the connecting piece (22).

8. The synchronous cementing radial horizontal well drill bit according to claim 7, characterized in that: The outer wall of the connecting member (22) is provided with mounting holes (24) distributed at equal distances, and the outer wall of the cutting end (4) is threadedly provided with fixing bolts (25) distributed at equal distances, and the fixing bolts (25) are adapted to the mounting holes (24).

9. The synchronous cementing radial horizontal well drill bit according to claim 1, characterized in that: The bottom outer wall of the connecting shaft (3) and the top outer wall of the cutting end (4) are both provided with sealing strips (26), and the sealing strips (26) are respectively adapted to the connecting shaft (3) and the cutting end (4).

10. The working method of a synchronous cementing radial horizontal well drill bit according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Before working, the drill bit body (1) is inserted into the protective cover (6) so as to connect the drill bit body (1) and the protective cover (6) to complete the assembly of the device. After the assembly is completed, the device is connected to the drilling equipment through the control shaft (9) at the top of the drill bit body (1). After the connection is completed, the drilling equipment drives the drill bit to drill down to the bottom of the well; S2: The drilling equipment drives the drill bit body (1) to rotate to drill the well. When the drill bit body (1) rotates, the inner cutting teeth (5) on the cutting end (4) at the bottom thereof and the outer cutting teeth (8) at the bottom of the protective ring (7) rotate together to cut the rock fragments, thereby drilling. During drilling, the liquid inlet pipe (10) injects water into the control shaft (9), and the water flows along the connecting shaft (3) into the cutting end (4). The rock fragments turn into muddy water after meeting the water. Then, the muddy water is pumped to the ground along the control shaft (9) through the drill bit body (1), thereby discharging the rock fragments generated during the drilling process. When the muddy water rises, the check pad (12) opens under the action of suction, and at the same time, the baffle (13) on the outer wall of the control shaft (9) is firmly adsorbed on the outer wall of the control shaft (9) under the action of suction, thereby preventing the muddy water from seeping out from the through hole; S3: After the drill bit body (1) is finished working, cementing cement is injected into the drill bit body (1) through the control shaft (9). The check pad (12) inside the control shaft (9) seals the control shaft (9) under the action of pressure, and the cementing cement cannot enter the connecting shaft (3). The cementing cement can only flow out from the through hole on the outer wall of the control shaft (9) and then from the casting hole (15). As the cementing cement gradually fills the gap between the outer wall of the protective cover (6) and the inner wall of the well, after the casting is completed, the drill bit body (1) and the protective cover (6) are separated. As the cementing cement solidifies, the cementing cement and the protective cover (6) together form a retaining wall, thereby preventing the inner wall of the well from collapsing and improving the safety of the exploration work. S4: When the drill bit body (1) is separated from the protective cover (6), the drill bit body (1) is directly pulled out from the inside of the protective cover (6). As the drill bit body (1) rises, the cutting end (4) presses the control block (17), and the control block (17) retracts into the inner wall of the control groove (16) under the action of pressure, so that the cutting end (4) is separated from the protective cover (6), and the drill bit body (1) is then taken out; S5: After the drill bit body (1) is taken out, water is poured into the drill bit body (1) through the liquid inlet pipe (10) and the control shaft (9) to clean the drill bit, flush out the muddy water and cementing cement attached to the inside of the drill bit, and complete the cleaning of the drill bit.

Images