Extendable double drill bit anti-stuck drill system and use method

Abstract

The present invention relates to an extendable dual-drill bit anti-drilling system and method of use, belonging to the technical field of drilling construction equipment. The system includes a first drill rod, a connecting device, a drill spreading device, a drill retraction bit, a second drill rod, and a drilling bit. The first drill rod is provided with a connecting device at one end, a drill spreading device is provided on the outside of the connecting device, the drill retraction bit is connected to the drill spreading device, and a second drill rod is provided at the other end of the connecting device, the drill retraction bit is connected to the second drill rod. The present invention uses a drill retraction bit to drill hard nodules or large sections of buried rock, which can quickly solve the problems of drill jams in hard nodules and large-scale buried rock. It has a simple structure, high reliability, and a wide range of applications.

Description

Technical Field

[0001] The invention relates to an extendable double-drill bit anti-drilling system and a use method thereof, belonging to the technical field of drilling construction equipment. Background Art

[0002] Drilling construction refers to the on-site drilling of a geological structure using a drilling rig connected to a drilling tool. Currently, drilling construction is widely used in various geological exploration, coal mine gas extraction, borehole pressure relief, water injection, and anchoring of roadways and slopes. However, as drilling depth increases, drill cuttings accumulate in the borehole and cannot be removed promptly. Especially during coal mine pressure relief applications, the surrounding rock is subjected to high stress, which can easily damage the borehole wall. Rock can break off from the borehole wall, creating large, difficult-to-remove hard nodules. This can easily lead to drill failure, drill sticking, and even drill burial or loss in severe cases. Furthermore, drilling in softer geology can easily cause large sections of the borehole to collapse, leading to drill sticking and burial. Once these problems occur, not only can drill rods and drill bits be damaged and lost, but they can also directly impact drilling progress and reduce efficiency.

[0003] Among existing technologies, Chinese patent document 201310051709.X discloses a device and method for inserting a casing while drilling to prevent the collapse of coal seam holes. This device adds a casing to the outside of the drill pipe, which protects the interior of the borehole from damage and provides support for the borehole. However, this device uses the casing to support the borehole. After drilling, the drill pipe is withdrawn from the casing, but the casing remains in the borehole, increasing drilling construction costs. Furthermore, since not only the drill pipe but also the casing must be added during the drilling process, the drilling process becomes more complex and drilling efficiency is low. Furthermore, the presence of the casing device complicates the technical application and limits the drilling depth.

[0004] Among existing technologies, Chinese patent document CN201810649675.7 discloses a reverse-rotating water-jet anti-stuck drill pipe system and method of use. The system comprises a front drill pipe, a water-jet device, a rotating device, and a rear drill pipe, arranged in sequence. The drill pipe rotates in reverse to clear stuck drill cuttings and rock, while the water-jet device removes fine drill cuttings. This system uses the drill pipe to clean drill cuttings, but the rotating drill pipe has a weak cleaning force, making it less effective against stubborn, large hard rock blocks. Furthermore, the drill pipe is too thin compared to the drill bit, making it difficult to clean large rocks stuck behind the drill bit. Furthermore, if a large section of the drill hole collapses, the drill cannot be withdrawn smoothly, which can easily lead to drill loss. This system fails to completely resolve the problems of drill sticking, drill burial, and drill loss. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides an extendable double-drill bit anti-drilling system. By setting a drill retracting drill bit to drill hard rock nodules or large sections of buried rock, it can quickly solve the problems of drill jams in hard rock nodules and large-scale buried drills. It has a simple structure, high reliability and a wide range of applications.

[0006] The present invention also provides a method for using the extendable double drill bit anti-stuck drill system.

[0007] The technical solutions of the present invention are as follows:

[0008] An extendable double drill bit anti-stuck drill system includes a first drill rod, a connecting device, a drill spreading device, a drill bit for withdrawing the drill, a second drill rod and a drill bit for drilling, wherein:

[0009] A connecting device is provided at one end of the first drill rod, a drill spreading device is provided outside the connecting device, the drill spreading device is connected to a drill retracting drill bit, and a second drill rod is provided at the other end of the connecting device, the second drill rod is connected to a drill bit.

[0010] Preferably, according to the present invention, the first drill rod includes a drill body and a baffle. The drill body is a cylindrical body. A first water supply hole is provided in the drill body. A baffle is provided on the drill body. The baffle is a hollow semi-cylindrical body. A drill withdrawal limit slot and a drill advance limit slot are provided on both sides of the baffle respectively. A spiral drill expansion slot is provided from top to bottom on the outside of the baffle. The upper end of the drill expansion slot is in an extended position, and the lower end is in a retracted position. The first drill rod is connected to a connecting device through the baffle.

[0011] Preferably, according to the present invention, the connecting device includes a connecting body, a drill spreading movable ring, a drill spreading moving rod, a drill spreading push rod column and a sealing plate. The connecting body is a hollow cylinder, and an annular slide rail is mounted on the middle part of the outer side of the connecting body. The outer side of the annular slide rail is mounted with a drill spreading movable ring. A drill spreading movable rod is arranged on one side of the drill spreading movable ring. The end of the drill spreading moving rod is connected to the drill spreading push rod column. The drill spreading push rod column passes through the connecting body vertically. A movable opening for the movement of the drill spreading push rod column is provided on the connecting body. The end of the drill spreading push rod column is arranged in the drill spreading slot of the baffle. A sealing plate is provided in the middle position inside the connecting body. A limiting column is provided at one end of the connecting body. The limiting column is connected to the drill withdrawal limiting slot or the drilling limit slot of the baffle for rotation limiting.

[0012] According to a further preferred embodiment of the present invention, a circular limiting groove is provided on the lower side of the sealing plate, and a limiting step is provided on the upper side of the baffle, and the axial movement of the baffle is limited by the cooperation between the limiting step and the circular limiting groove.

[0013] Preferably, according to the present invention, a sealing ring is provided at the connecting end of the connecting body and the first drill rod, and a sealing gasket is provided inside the connecting body.

[0014] Preferably, according to the present invention, the drill expansion device includes a slide rail and a drill expansion support rod, the drill retraction drill bit includes a telescopic drill bit and diamond-shaped crushing teeth, and the slide rail is evenly distributed around the outside of the other end of the connecting body. The telescopic drill bit is hingedly connected to the end of the slide rail close to the second drill rod, and the telescopic drill bit is provided with diamond-shaped crushing teeth. The middle part of the telescopic drill bit is hingedly connected to the drill expansion support rod, and the other end of the drill expansion support rod is hingedly connected to the drill expansion movable ring.

[0015] According to a preferred embodiment of the present invention, a protective shell is provided on the outside of the connecting body for protecting internal structures such as the drill spreading movable ring, the drill spreading moving rod, and the drill spreading support rod.

[0016] Preferably, according to the present invention, a first water hole is provided in the drill body of the first drill rod, the first water hole is connected to an external water source, and the internal space of the connecting body serves as the second water hole. A third water hole is provided in the second drill rod, and an end water outlet is provided on the sealing plate. A water pipe is provided in the connecting body on the inner side of the drilling device, one end of the water pipe is connected to a drill withdrawal water outlet arranged around the connecting body, and the other end is connected to the internal space of the connecting body through the inner wall water hole, and cleaning is performed during drilling and withdrawing through an external water source.

[0017] The method of using the above-mentioned extendable double drill bit anti-stuck drill system is as follows:

[0018] (1) The first drill rod is connected to the drilling rig. During normal drilling, the drilling rig rotates forward, the drill body drives the baffle to rotate, the drilling limit slot on the baffle rotates to the limit column, the limit column is stuck in the drilling limit slot, and then drives the connecting device to rotate. At this time, the drill push rod column is located in the retracted position of the drill slot, and the drill bit is in a retracted state. At the same time, the baffle blocks the inner wall water hole on the connecting device, and water flows into the second drill rod through the end water port, and then flows to the drilling bit, cleaning the drill bit and the drill cuttings;

[0019] (2) When the drill is stuck or buried, the drill rig is reversed to withdraw the drill, the drill body rotates, and the baffle rotates in the opposite direction. The drill withdrawal limit slot on the baffle rotates to the limit column, and the limit column is stuck in the drill withdrawal limit slot. During the rotation, the drill extension push rod column moves from the contracted position of the drill extension slot to the extended position, driving the drill extension moving rod and the drill extension movable ring to move toward the second drill rod. The drill extension movable ring pushes the drill extension support rod to support the telescopic drill bit. Then, the drill withdrawal drill bit rotates, and drills into the stuck or buried rock through the diamond-shaped crushing teeth to crush the rock and achieve smooth drill withdrawal. At the same time, the water hole on the inner wall is opened, and the water outlet at the end is sealed by the baffle. Water flows through the water hole on the inner wall, passes through the water pipe, and is sprayed out at the drill withdrawal water outlet to clean the drill withdrawal bit.

[0020] Preferably, according to the present invention, in step (1), the diameter of the drill bit in the retracted state is smaller than the diameter of the drill hole, which will not affect the normal drilling of the drilling rig.

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

[0022] 1. The present invention designs a drill bit for withdrawing drill bits to assist in water jet cleaning of drill cuttings. When the drill is stuck in a deep hole, especially when the drill is stuck in a hard rock nodule or a large section of drill is buried, the drill bit can be set up to drill the hard rock nodules or large sections of buried rock, which can quickly solve the problems of drill stuck in hard rock nodules and large-scale buried drill.

[0023] 2. The present invention has a simple structure, high reliability, and a wider range of applications, and is applicable to situations of drill sticking and drill embedment of varying degrees.

[0024] 3. The present invention uses water flow to clean the drill cuttings generated during the drilling process, preventing the drill from accumulating inside the borehole and causing the drill to get stuck. At the same time, the device is easy to operate, effectively solves the problem of drill getting stuck during the drill withdrawal process, and greatly improves the speed of drill withdrawal. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic diagram of the first drill rod structure of the present invention;

[0027] Figure 3 is a schematic diagram of the connection device of the present invention;

[0028] Figure 4 The connecting device of the present invention is along Figure 3 Schematic cross-sectional view of line AA;

[0029] Figure 5 The connecting device of the present invention is along Figure 3 Schematic cross-sectional view of the midline BB;

[0030] Figure 6 is a schematic diagram of the drilling device of the present invention;

[0031] Figure 7 The schematic diagram of the drilling device of the present invention is as follows Figure 6 Schematic cross-sectional view of the CC line;

[0032] Wherein: 1 - first drill rod; 2 - connecting device; 3 - drilling device; 4 - drill bit for withdrawing drill; 5 - second drill rod; 6 - drill bit for drilling;

[0033] 11 - drill body; 12 - first water delivery hole; 13 - drill extension slot; 14 - drill retraction limit slot; 15 - drill advance limit slot; 16 - limit step; 17 - baffle; 18 - extension position; 19 - retraction position;

[0034] 20 - drill spreader push rod column; 21 - sealing ring; 22 - movable opening; 23 - drill spreader movable rod; 24 - inner wall water hole; 25 - drill spreader movable ring; 26 - second water delivery hole; 27 - limit column; 28 - sealing gasket; 29 - connecting body; 30 - circular ring limit slot;

[0035] 291-annular slide rail; 292-sealing plate; 293-end water outlet;

[0036] 301—water pipe; 302—drilling back water nozzle;

[0037] 31—drill support rod; 32—diamond-shaped crushing teeth; 33—connecting bolts; 34—telescopic drill bit; 35—fixing bolts; 36—slide rail. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to embodiments and accompanying drawings, but is not limited thereto.

[0039] Example 1:

[0040] like Figure 1-7 As shown, this embodiment provides an extendable double-drill bit anti-stuck drill system, comprising a first drill rod 1, a connecting device 2, a drill spreading device 3, a drill bit 4 for withdrawing the drill, a second drill rod 5 and a drill bit 6 for drilling, wherein:

[0041] A connecting device 2 is provided at one end of the first drill rod 1, a drill spreading device 3 is provided outside the connecting device 2, the drill spreading device 3 is connected to a drill bit 4 for withdrawing the drill, and a second drill rod 5 is provided at the other end of the connecting device 3, the second drill rod 5 is connected to a drill bit 6 for drilling.

[0042] The first drill rod 1 includes a drill body 11 and a baffle 17. The drill body 11 is a cylindrical body. A first water delivery hole 12 is provided in the drill body 11. A baffle 17 is provided on the drill body 11. The baffle 17 is a hollow semi-cylindrical body. A drill withdrawal limit slot 14 and a drill advance limit slot 15 are respectively provided on both sides of the baffle 17. A spiral drill expansion slot 13 is provided on the outside of the baffle 17. The upper end of the drill expansion slot 13 is an extended position 18, and the lower end is a retracted position 19. The first drill rod 1 is connected to the connecting device 2 through the baffle 17.

[0043] The connecting device 2 includes a connecting body 29, a drill spreading movable ring 25, a drill spreading moving rod 23, a drill spreading push rod column 20 and a sealing plate 292. The connecting body 29 is a hollow cylinder. An annular slide rail 291 is provided on the middle part of the outer side of the connecting body. The outer side of the annular slide rail is provided with a drill spreading movable ring 25. A drill spreading movable rod 23 is provided on one side of the drill spreading movable ring 25. The end of the drill spreading moving rod 23 is connected to the drill spreading push rod column 20. The drill spreading push rod column 20 passes through the connecting body vertically. The end of the drill spreading push rod column is provided in the drill spreading slot of the baffle. A movable opening 22 for the movement of the drill spreading push rod column is provided on the connecting body. The movable opening is always closed by the inner baffle and water will not seep from the movable opening. A sealing plate 292 is provided in the middle position inside the connecting body 29. A limiting column 27 is provided at one end of the connecting body 29. The limiting column 27 is connected to the drill withdrawal limiting slot 14 or the drilling limit slot 15 of the baffle for rotation limiting.

[0044] The drilling device 3 includes a slide rail 36 and a drilling support rod 31, and the drill bit 4 includes a telescopic drill bit 34 and a diamond-shaped crushing tooth 32. The slide rail 36 is evenly distributed around the outside of the other end of the connecting body 29. The slide rail 36 is fixed to the connecting body by a fixing bolt 35. The end of the slide rail 36 close to the second drill rod 5 is hinged with the telescopic drill bit 34 by a connecting bolt 33. There are 6 slide rails and telescopic drill bits, and the specific number is not limited and can be adjusted according to actual needs. The telescopic drill bit 34 is provided with a diamond-shaped crushing tooth 32, and the middle part of the telescopic drill bit 34 is hinged with the drilling support rod 31, and the other end of the drilling support rod 31 is hinged to the drilling movable ring 25.

[0045] A first water supply hole 12 is provided in the drill body of the first drill rod 1, and the first water supply hole 12 is connected to an external water source. The internal space of the connecting body 29 serves as a second water supply hole 26. A third water supply hole is provided in the second drill rod 5, and an end water outlet 293 is provided on the sealing plate 292. A water supply pipe 301 is provided in the connecting body inside the drilling device 3. One end of the water supply pipe 301 is connected to a drill withdrawal water outlet 302 arranged around the connecting body 29, and the other end is connected to the internal space of the connecting body 29 through the inner wall water hole 24. The external water source is used for cleaning during drilling and withdrawal.

[0046] The method of using the above-mentioned extendable double drill bit anti-stuck drill system is as follows:

[0047] (1) The first drill rod is connected to the drilling rig. During normal drilling, the drilling rig rotates forward, the drill body 11 drives the baffle 17 to rotate, and the drilling limit slot on the baffle rotates to the limit column 27. The limit column 27 is stuck in the drilling limit slot 15, thereby driving the connection device to rotate. At this time, the drill extension push rod column 20 is located in the contraction position of the drill extension slot 13, and the drill bit 4 is in a contracted state. The diameter of the drill bit in the contracted state is smaller than the diameter of the drill hole, which will not affect the normal drilling of the drilling rig. At the same time, the baffle 17 blocks the inner wall water hole 24 on the connecting device 3, and water flows into the second drill rod through the end water port, and then flows to the drilling bit 6 to clean the drill bit and the drill cuttings;

[0048] (2) When the drill is stuck or buried, the drill rig is reversed to withdraw the drill. The drill body 11 rotates, driving the baffle 17 to rotate in the opposite direction. The drill withdrawal limit slot 14 on the baffle 17 rotates to the limit column 27, and the limit column 27 is stuck in the drill withdrawal limit slot 14. During the rotation, the drill extension push rod column 20 moves from the contraction position 19 of the drill extension slot 13 to the extension position 18, driving the drill extension moving rod 23 and the drill extension movable ring 25 to move toward the second drill rod. The drill extension movable ring 25 pushes the drill extension support rod 31 to support the telescopic drill bit 34. Then, the drill withdrawal drill bit 4 rotates and drills into the stuck or buried rock through the diamond-shaped crushing teeth 32 to crush the rock and achieve smooth drill withdrawal. At the same time, the inner wall water hole 24 is opened, and the end water outlet is sealed by the baffle 17. Water flows through the inner wall water hole 24, passes through the water pipe 301, and is sprayed out at the drill withdrawal water outlet 302 to clean the drill withdrawal bit.

[0049] Example 2:

[0050] An extendable double drill bit anti-stuck drilling system has a structure as described in Example 1, except that a circular limit groove 30 is provided on the lower side of the sealing plate 292, and a limit step 16 is provided on the upper side of the baffle 17. The limit step cooperates with the circular limit groove to limit the axial movement of the baffle 17.

[0051] Example 3:

[0052] A deployable dual-drill anti-stuck drill system, structured as in Example 1, differs in that a protective housing is provided on the exterior of the connecting body to protect the internal structures, including the drill spreading ring, drill spreading rod, and drill spreading support rod. A sealing ring 21 is provided at the connection end between the connecting body 29 and the first drill rod 1, and a sealing gasket 28 is provided within the connecting body.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An extendable double drill bit anti-stuck drill system, characterized in that: It includes a first drill rod, a connecting device, a drill spreading device, a drill bit for withdrawing the drill, a second drill rod and a drill bit for drilling, wherein: A connecting device is provided at one end of the first drill rod, a drill spreading device is provided outside the connecting device, the drill spreading device is connected to a drill bit for withdrawing the drill, and a second drill rod is provided at the other end of the connecting device, the second drill rod is connected to a drill bit for drilling; The first drill rod includes a drill body and a baffle. The drill body is cylindrical and is provided with a first water delivery hole. The drill body is provided with a baffle. The baffle is hollow and semi-cylindrical. A drill withdrawal limit slot and a drill advance limit slot are provided on both sides of the baffle. A spiral drill expansion slot is provided on the outer side of the baffle. The upper end of the drill expansion slot is in an extended position, and the lower end is in a retracted position. The first drill rod is connected to a connecting device through the baffle. The connecting device includes a connecting body, a drill spreading movable ring, a drill spreading moving rod, a drill spreading push rod column and a sealing plate. The connecting body is a hollow cylinder. An annular slide rail is mounted on the middle part of the outer side of the connecting body. A drill spreading movable ring is mounted on the outer side of the annular slide rail. A drill spreading movable rod is arranged on one side of the drill spreading movable ring. The end of the drill spreading moving rod is connected to the drill spreading push rod column. The drill spreading push rod column passes vertically through the connecting body. A movable opening for the movement of the drill spreading push rod column is provided on the connecting body. The end of the drill spreading push rod column is arranged in the drill spreading slot of the baffle. A sealing plate is provided in the middle position inside the connecting body. A limiting column is provided at one end of the connecting body. The limiting column is connected to the drill withdrawal limiting slot or the drilling limit slot of the baffle.

2. The extendable double drill bit anti-stuck drill system according to claim 1, characterized in that: A circular ring limiting groove is provided on the lower side of the sealing plate, and a limiting step is provided on the upper side of the baffle.

3. The extendable double drill bit anti-stuck drill system according to claim 1, characterized in that: A sealing ring is provided at the connecting end of the connecting body and the first drill rod, and a sealing gasket is provided inside the connecting body.

4. The extendable double drill bit anti-stuck drill system according to claim 1, characterized in that: The drill spreading device includes a slide rail and a drill spreading support rod. The drill retraction drill bit includes a telescopic drill bit and diamond-shaped crushing teeth. Slide rails are evenly distributed around the outside of the other end of the connecting body. The telescopic drill bit is hinged on the end of the slide rail close to the second drill rod. The telescopic drill bit is provided with diamond-shaped crushing teeth. The middle of the telescopic drill bit is hinged with a drill spreading support rod. The other end of the drill spreading support rod is hinged to the drill spreading movable ring.

5. The extendable double drill bit anti-stuck drill system according to claim 4, characterized in that: A protective shell is arranged on the outside of the connecting body.

6. The extendable double drill bit anti-stuck drill system according to claim 4, characterized in that: A first water hole is provided in the drill body of the first drill rod, the first water hole is connected to an external water source, and the internal space of the connecting body serves as a second water hole. A third water hole is provided in the second drill rod, and an end water outlet is provided on the sealing plate. A water pipe is provided in the connecting body inside the drilling expansion device, and one end of the water pipe is connected to a drill withdrawal water nozzle arranged around the connecting body, and the other end is connected to the internal space of the connecting body through the water hole on the inner wall.

7. The method for using the extendable double drill bit anti-stuck drill system according to claim 6, wherein: Here are the steps: (1) Connect the first drill rod to the drilling rig. During normal drilling, the drilling rig rotates forward, the drill body drives the baffle to rotate, the drilling limit slot on the baffle rotates to the limit column, the limit column is stuck in the drilling limit slot, and then drives the connecting device to rotate. At this time, the drill push rod column is located in the retracted position of the drill slot, and the drill bit is in a retracted state. At the same time, the baffle blocks the inner wall water hole on the connecting device, and water flows into the second drill rod through the end water port, and then flows to the drilling bit, cleaning the drill bit and the drill cuttings; (2) When the drill is stuck or buried, the drill rig is reversed to withdraw the drill. The drill body rotates, driving the baffle to rotate in the opposite direction. The drill withdrawal limit slot on the baffle rotates to the limit column, and the limit column is stuck in the drill withdrawal limit slot. During the rotation, the drill extension push rod column moves from the contracted position of the drill extension slot to the extended position, driving the drill extension moving rod and the drill extension movable ring to move toward the second drill rod. The drill extension movable ring pushes the drill extension support rod to support the telescopic drill bit. Then, the drill withdrawal drill bit rotates and drills into the stuck or buried rock through the diamond-shaped crushing teeth to crush the rock and achieve smooth drill withdrawal. At the same time, the water hole on the inner wall is opened, and the water outlet at the end is sealed by the baffle. Water flows through the water hole on the inner wall, passes through the water pipe, and is sprayed out at the drill withdrawal water outlet to clean the drill withdrawal bit.

8. The method for using the extendable double drill bit anti-stuck drill system according to claim 7, wherein: In step (1), the diameter of the drill bit in the retracted state is smaller than the diameter of the drill hole.

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