Ridge roller linkage self-cleaning anti-jamming PDC (polycrystalline diamond compact) drill bit

Abstract

The invention provides a ridge roller linkage self-cleaning anti-jamming PDC drill bit, and belongs to the technical field of petroleum and geological drilling tools, the ridge roller linkage self-cleaning anti-jamming PDC drill bit comprises a connector, a threaded connector fixedly mounted at the top of the connector and a drill bit body, a drill bit threaded opening is formed in the inner wall of the connector, and the connector is in threaded connection with the drill bit body through the drill bit threaded opening; a ridge-shaped ring is rotatably installed on the outer wall of the bottom of the connector, a roller cutter is connected to the bottom of the ridge-shaped ring, the inner wall of the roller cutter is rotatably connected with the assembling face of the roller cutter, the roller cutter is connected to the drill bit body through the assembling face and freely rotates relative to the drill bit body, and a plurality of teeth are arranged on the outer wall of the roller cutter. And a chip groove is formed in the roller cutter. According to the invention, the problem of drill jamming caused by fragments and rock debris falling from the well wall can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum and geological drilling tools, in particular to a ridge-roller linkage self-cleaning anti-sticking PDC drill bit. Background Art

[0002] At present, rotary drilling bits including PDC teeth as cutting teeth are widely used in the fields of petroleum, geology, etc. This type of drill bit is referred to as PDC drill bit. PDC drill bit is a commonly used drilling tool in the geological drilling industry and is the main tool for breaking rocks during oil and gas drilling. It has the advantages of high mechanical penetration rate and long drill bit footage life. During the drilling process, there are often fragments falling from the well wall due to unstable formations. The fragments fall to the bottom of the well and accumulate in the gap between the drill bit gauge surface and the well wall, causing the friction between the well wall and the drill bit to increase, which can easily cause the drill bit to get stuck. However, since the falling of fragments from the well wall and the deposition of cuttings are inevitable, it is necessary to design a PDC drill bit that prevents drilling from getting stuck. Summary of the invention

[0003] The purpose of the present invention is to provide a ridge-roller linkage self-cleaning anti-sticking PDC drill bit, which can solve the drill sticking problem caused by fragments and cuttings falling from the well wall.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] In the first aspect, a ridge-roller linked self-cleaning and anti-sticking PDC drill bit comprises a joint, a threaded interface fixedly mounted on the top of the joint and a drill bit body, the inner wall of the joint being provided with a drill bit threaded opening, the joint being threadedly connected to the drill bit body via the drill bit threaded opening, a ridge-shaped ring being rotatably mounted on the bottom outer wall of the joint, a roller cutter being connected to the bottom of the ridge-shaped ring, the inner wall of the roller cutter being rotatably connected to the assembly surface of the roller cutter, the roller cutter being connected to the drill bit body via the assembly surface, the roller cutter being freely rotatable relative to the drill bit body, a plurality of teeth being provided on the outer wall of the roller cutter, and a chip removal groove being installed inside the roller cutter.

[0006] Furthermore, the ridge ring comprises a ridge block, an arc surface and a ridge slope, the ridge block is arranged on the outer wall of the ridge ring, the arc surface is installed on the top of the ridge block, and the ridge slope is installed in the middle of the ridge block.

[0007] Furthermore, the surface of the arc surface is a smooth surface.

[0008] Furthermore, a wear-resistant surface is installed on the outer wall of the drum knife.

[0009] Furthermore, the portion of the teeth that is higher than the surface of the roller cutter is trapezoidal.

[0010] Furthermore, the teeth are PDC teeth.

[0011] Furthermore, a polycrystalline diamond composite sheet is inlaid on the back of the ridge-shaped block.

[0012] In a second aspect, the present application also provides an application method of the above-mentioned ridge roller linkage self-cleaning anti-stuck PDC drill bit, comprising the following steps:

[0013] S1. Before drilling, connect the entire drill bit to the drill pipe through the threaded interface at the top of the joint to ensure it is tightly connected.

[0014] S2. Start the drilling rig, the drill rod drives the joint to rotate, and the joint in turn drives the ridge ring to rotate; the ridge blocks on the ridge ring guide the fallen blocks and gravel to both sides through the arc surface and the ridge slope; at the same time, the drum cutter rotates, crushing the fallen blocks and rock chips through the teeth; the crushed blocks and rock chips enter the free space in the drill bit body through the chip discharge groove to prevent the drill from getting stuck.

[0015] S3. After the drilling operation is completed, the drill bit is lifted out of the well, cleaned, and the rock cuttings and mud attached to the surface are removed; the wear of the ridge block, drum cutter, teeth, chip groove and other parts are checked. If there is severe wear, replace or repair it in time.

[0016] Advantages of the present invention:

[0017] 1. The top of the ridge block of the present invention is provided with a smooth arc surface structure and a ridge slope. This allows the ridge block to more effectively remove the fallen blocks and rock debris. At the same time, the force on the ridge block is reduced, so that the back can always maintain a ridge state.

[0018] 2. The present invention embeds a polycrystalline diamond composite sheet on the back of the ridge-shaped block, which is super hard and super wear resistant and can effectively enhance the impact resistance and wear resistance of the back.

[0019] 3. The roller cutter of the present invention can prevent larger pieces from entering the bottom of the well, and the teeth on the roller cutter can crush the pieces from the well wall and have the function of trimming the well wall, thereby reducing the risk of pieces entering the bottom of the well and preventing or reducing the risk of drill bit jamming due to pieces.

[0020] 4. The teeth of the roller cutter of the present invention are PDC teeth, which are super hard and wear resistant and can efficiently crush the falling rock cuttings.

[0021] 5. The roller cutter of the present invention is provided with a chip discharge groove, which can timely discharge the crushed rock fragments and make them enter the free space of the drill bit body, thereby reducing the risk of drill sticking. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] In the figure: 1. Connector;

[0024] 2. Threaded interface;

[0025] 3. ridge ring, 3-1. ridge block, 3-2. arc surface, 3-3. ridge slope;

[0026] 4. Roller knife;

[0027] 5. Drill body;

[0028] 6. Teeth;

[0029] 7. Chip groove. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0031] like Figure 1 As shown, a ridge roller linkage self-cleaning anti-stuck PDC drill bit includes a joint 1, a threaded interface 2 fixedly mounted on the top of the joint 1, and a drill bit body 5. The inner wall of the joint 1 is provided with a drill bit threaded opening, and the joint 1 is threadedly connected to the drill bit body 5 through the drill bit threaded opening. A ridge ring 3 is rotatably mounted on the bottom outer wall of the joint 1, and a roller cutter 4 is connected to the bottom of the ridge ring 3. The roller cutter 4 can roll the surface of the well wall to stabilize the drill bit and trim the well wall, and can also roll and crush the well wall blocks, effectively reducing the risk of stuck drill bits due to block drops. The inner wall of the roller cutter 4 is rotatably connected to the assembly surface of the roller cutter 4, and the roller cutter 4 is connected to the drill bit body 5 through the assembly surface, and the roller cutter 4 can rotate freely relative to the drill bit body 5.

[0032] A plurality of teeth 6 are provided on the outer wall of the drum cutter 4, and the teeth 6 improve the efficiency of crushing fallen fragments and rock chips.

[0033] The drum cutter 4 is internally provided with a chip removal groove 7. The chip removal groove 7 has a chip removal function, and the fragments and rock cuttings can directly enter the free space in the drill bit body 5 along the chip removal groove, significantly reducing the risk of drill sticking.

[0034] As a preferred embodiment of the present invention, the ridge ring 3 includes a ridge block 3-1, an arc surface 3-2 and a ridge slope 3-3, the ridge block 3-1 is arranged on the outer wall of the ridge ring 3, the arc surface 3-2 is installed on the top of the ridge block 3-1, and the ridge slope 3-3 is installed in the middle of the ridge block 3-1.

[0035] As a preferred embodiment of the present invention, the surface of the arc surface 3-2 is a smooth surface.

[0036] As a preferred embodiment of the present invention, a wear-resistant surface is installed on the outer wall of the drum knife 4.

[0037] As a preferred embodiment of the present invention, the portion of the teeth 6 that is higher than the surface of the drum cutter 4 is trapezoidal, which stabilizes the drill bit and also trims the well wall.

[0038] As a preferred embodiment of the present invention, the teeth 6 are PDC teeth.

[0039] As a preferred embodiment of the present invention, a polycrystalline diamond composite sheet is embedded on the back of the ridge-shaped block 3 - 1 .

[0040] Working principle of this device:

[0041] When the drilling rig is started, the drill pipe drives the joint 1 to rotate, and the joint 1 drives the ridge ring 3 to rotate together. In the process of the drill bit drilling into the formation, the rock in the formation is broken by the drill bit and produces fragments and rock chips. At this time, the ridge block 3-1 on the ridge ring 3 plays a role. The arc surface 3-2 on the top of the ridge block 3-1 and the ridge slope 3-3 in the middle will move and discharge the fallen fragments and rock chips to both sides to prevent them from accumulating in front of the drill bit. At the same time, the roller cutter 4 also starts to work, and the fragments and rock chips discharged to both sides are further crushed by the teeth 6 on the roller cutter 4. At the same time, the roller cutter 4 can also trim the well wall during the crushing process. The crushed fragments and rock chips will enter the free space in the drill body 5 along the chip discharge groove 7. In this way, the fallen pieces and rock chips will not accumulate and squeeze on the front end face of the drill body 5, and it is also avoided to be squeezed into the gap between the gauge surface and the well wall, thereby greatly reducing the risk of stuck drill.

[0042] The present application also provides an application method of the above-mentioned ridge roller linkage self-cleaning anti-sticking PDC drill bit, comprising the following steps:

[0043] S1. Before drilling, connect the entire drill bit to the drill pipe through the threaded interface 2 at the top of the joint 1 to ensure that it is tightly connected.

[0044] S2. Start the drilling rig, the drill rod drives the joint 1 to rotate, and the joint 1 in turn drives the ridge ring 3 to rotate; the ridge block 3-1 on the ridge ring 3 guides the fallen blocks and gravel to both sides through the arc surface 3-2 and the ridge slope 3-3; at the same time, the roller cutter 4 rotates, and the teeth 6 crush the fallen blocks and rock chips; the crushed blocks and rock chips enter the free space in the drill bit body 5 through the chip discharge groove 7 to prevent the drill from getting stuck.

[0045] S3. After the drilling operation is completed, the drill bit is taken out of the well, cleaned, and the rock cuttings and mud attached to the surface are removed; the wear of the ridge block 3-1, the drum cutter 4, the teeth 6, and the chip groove 7 are checked. If there is severe wear, replace or repair it in time.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can still adjust the technical solutions described in the above embodiments or replace some of the technical features by equivalents. Therefore, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A ridge roller linkage self-cleaning anti-sticking PDC drill bit, comprising a joint (1), a threaded interface (2) fixedly mounted on the top of the joint (1) and a drill bit body (5), characterized in that: The inner wall of the joint (1) is provided with a drill thread opening, and the joint (1) is threadedly connected to the drill body (5) through the drill thread opening. A ridge ring (3) is rotatably mounted on the outer wall of the bottom of the joint (1), and a roller cutter (4) is connected to the bottom of the ridge ring (3). The inner wall of the roller cutter (4) is rotatably connected to the assembly surface of the roller cutter (4). The roller cutter (4) is connected to the drill body (5) through the assembly surface. The roller cutter (4) is freely rotatable relative to the drill body (5). A plurality of teeth (6) are arranged on the outer wall of the roller cutter (4), and a chip removal groove (7) is installed inside the roller cutter (4).

2. The ridge-roller linkage self-cleaning anti-sticking PDC drill bit according to claim 1, characterized in that: The ridge-shaped ring (3) comprises a ridge-shaped block (3-1), an arc surface (3-2) and a ridge-shaped slope (3-3); the ridge-shaped block (3-1) is arranged on the outer wall of the ridge-shaped ring (3); the arc surface (3-2) is installed on the top of the ridge-shaped block (3-1); and the ridge-shaped slope (3-3) is installed in the middle of the ridge-shaped block (3-1).

3. The ridge-roller linkage self-cleaning and anti-sticking PDC drill bit according to claim 2, characterized in that: The surface of the arc surface (3-2) is a smooth surface.

4. The ridge-roller linkage self-cleaning and anti-sticking PDC drill bit according to claim 3, characterized in that: The outer wall of the roller knife (4) is provided with a wear-resistant surface.

5. The ridge-roller linkage self-cleaning anti-sticking PDC drill bit according to claim 4, characterized in that: The portion of the teeth (6) that is higher than the surface of the roller knife (4) is in a trapezoidal shape.

6. The ridge-roller linkage self-cleaning anti-sticking PDC drill bit according to claim 5, characterized in that: The teeth (6) are PDC teeth.

7. The ridge-roller-linked self-cleaning and anti-sticking PDC drill bit according to claim 6, characterized in that: A polycrystalline diamond composite sheet is inlaid on the back of the ridge-shaped block (3-1).

8. The application method of the ridge-roller linkage self-cleaning anti-sticking PDC drill bit according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Before drilling, connect the entire drill bit to the drill pipe through the threaded interface (2) at the top of the joint (1) to ensure that it is tightly connected; S2. The drilling rig is started, the drill rod drives the joint (1) to rotate, and the joint (1) in turn drives the ridge ring (3) to rotate; the ridge block (3-1) on the ridge ring (3) guides the fallen blocks and rocks to both sides through the arc surface (3-2) and the ridge slope (3-3); at the same time, the drum cutter (4) rotates, and the teeth (6) crush the fallen blocks and rock chips; the crushed blocks and rock chips enter the free space in the drill bit body (5) through the chip discharge groove (7) to prevent the drill from getting stuck; S3. After the drilling operation is completed, the drill bit is taken out of the well, cleaned, and the rock cuttings and mud attached to the surface are removed; the wear of the ridge block (3-1), the drum cutter (4), the teeth (6), and the chip groove (7) are checked. If there is severe wear, it should be replaced or repaired in time.

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