Anti-impact PDC drill bit for petroleum drilling

Abstract

The utility model relates to the technical field of drill bits for petroleum drilling, and discloses an anti-impact PDC drill bit for petroleum drilling, which comprises a drill bit body, the bottom of the drill bit body is fixedly connected with a fixed tooth ring, the inside of the fixed tooth ring is fixedly connected with a fixed half sector plate, the inside of the fixed half sector plate is fixedly connected with a rotary connecting shaft, and the rotary connecting shaft is fixedly connected with the bottom of the drill bit body. The top of the fixed tooth ring is rotationally connected with a rotating tooth ring, the interior of the rotating tooth ring is fixedly connected with a rotating half sector plate, and the top of the rotating tooth ring is fixedly connected with a limiting assembly. According to the drill bit, the fixed tooth ring and the rotating tooth ring are matched for adjustment, the rotating half sector plate and the fixed half sector plate act in a crossed mode, water flow is effectively limited, it is ensured that the drill bit works stably under various conditions, and the inner counter bore bolt, the rotating tooth ring and the drill bit body are firmly connected; and the stability and the reliability of the structure are further enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of petroleum drilling drill bit especially relates to a kind of anti-impact PDC drill bits for petroleum drilling. BACKGROUND

[0002] Petroleum drilling refers to the process of extracting oil and gas by drilling equipment and technology, which is the first step of oil exploitation, and the purpose is to find exploitable oil and gas by drilling underground reservoirs. PDC drill bit is a kind of drill bit used in drilling operation, widely used in oil, gas and geological exploration fields, and PDC drill bit is characterized by using polycrystalline diamond as cutting material, with extremely high hardness and wear resistance.

[0003] Part of the anti-impact PDC drill bit in the prior art is a drill bit designed to cope with high impact force and complex geological conditions, which usually includes polycrystalline diamond blades, metal base, reinforced guide and elastic buffer material, PDC blades provide strong cutting ability, which can effectively cope with hard rock, metal base provides structural support, guide ensures the stability of drill bit and reduces deflection, and elastic buffer material absorbs and disperses impact force from stratum to prevent blade damage, its working principle is to cut stratum by rotating and pressing force using the superhard property of PDC blade, while reducing impact force by using buffer design, prolonging drill bit life and improving drilling efficiency.

[0004] However, in specific use process, part of the drill bit is fixed water flow, which is insufficient to effectively remove drill cuttings in some cases, resulting in increased wear and tear of drill bit and occurrence of blockage, while in other cases, excessive water flow will cause unnecessary energy waste and impact damage to drill bit, aiming at the above problems, the present application provides an anti-impact PDC drill bit for petroleum drilling. UTILITY MODEL CONTENT

[0005] In order to make up for the above shortcomings, the utility model provides an anti-impact PDC drill bit for petroleum drilling, which aims to improve the problem of fixed water flow of part of the drill bit in the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] An anti-impact PDC drill bit for petroleum drilling, comprising a drill bit body, a fixed tooth ring fixedly connected to the bottom of the drill bit body, a fixed half-fan plate fixedly connected to the inside of the fixed tooth ring, a rotating connection shaft fixedly connected to the inside of the fixed half-fan plate, a rotating tooth ring rotatably connected to the top of the fixed tooth ring, a rotating half-fan plate fixedly connected to the inside of the rotating tooth ring, and a limiting assembly fixedly connected to the top of the rotating tooth ring.

[0008] As a further description of the above technical solutions:

[0009] The limiting assembly comprises a fixed connecting plate, the bottom of the fixed connecting plate is fixedly connected to the top of the rotating gear ring, the top of the fixed connecting plate is fixedly connected with a connecting threaded head, and a plurality of countersunk bolts are threadedly connected in the fixed connecting plate;

[0010] As a further description of the above technical solutions:

[0011] The drill bit body is fixedly connected with a plurality of long cutting blades on the outside, and is fixedly connected with a plurality of short cutting blades on the outside;

[0012] As a further description of the above technical solutions:

[0013] The inside of the long cutting blade is fixedly connected with a plurality of PDC drill teeth, and the inside of the short cutting blade is fixedly connected with a plurality of cleaning hole heads;

[0014] As a further description of the above technical solutions:

[0015] The inside of the drill bit body is provided with a plurality of cleaning hole heads, and the inside of the drill bit body is threadedly connected to the outside of the plurality of countersunk bolts;

[0016] As a further description of the above technical solutions:

[0017] The inside of the rotating half-plate is rotatably connected to the inside of the rotating connecting shaft, and the bottom of the rotating half-plate is slidably connected to the top of the fixed half-plate.

[0018] The utility model has the advantages of the following beneficial effects:

[0019] In the utility model, the fixed gear ring and the rotating gear ring are matched to adjust, the rotating half-plate and the fixed half-plate cross-act, effectively limit the water flow, ensure the stable work of the drill bit under various conditions, and the countersunk bolt in the inside, the rotating gear ring and the drill bit body are firmly connected, further enhance the stability and reliability of the structure. ACCURACY OF DRAWINGS

[0020] Fig. 1 A three-dimensional schematic view of the anti-impact PDC drill bit for oil drilling is provided for the utility model;

[0021] Fig. 2 A structure schematic view of the long cutting blade of the anti-impact PDC drill bit for oil drilling is provided for the utility model;

[0022] Fig. 3The utility model provides a kind of connecting thread head structure diagram of impact-resistant PDC drill bit for petroleum drilling.

[0023] Legend:

[0024] 1, drill bit body;2, long cutting blade wing;3, short cutting blade wing;4, cleaning hole head;5, PDC drill bit;6, fixed tooth ring;7, fixed half fan plate;8, rotating connecting shaft;9, rotating tooth ring;10, rotating half fan plate;11, fixed connecting plate;12, connecting thread head;13, counterbore bolt. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0026] Reference Figs. 1 to 3 , the utility model provides an embodiment: a kind of impact-resistant PDC drill bit for petroleum drilling, including drill bit body 1, can withstand the huge impact force and torque generated in the process of drilling, the surface of drill bit body 1 is treated by special heat treatment and anticorrosive coating, to enhance its wear resistance and corrosion resistance, prolong service life, the bottom of drill bit body 1 is fixedly connected with fixed tooth ring 6, fixed tooth ring 6 is annular, surface has multiple teeth, for connecting rotating tooth ring 9, limit each other, fixed tooth ring 6 is fixedly connected with fixed half fan plate 7 in its inside, fixed half fan plate 7 is semicircular, restricts water flow, fixed half fan plate 7 is fixedly connected with rotating connecting shaft 8 in its inside, has flexibility and wear resistance, for connecting fixed half fan plate 7 and rotating half fan plate 10, the top of fixed tooth ring 6 is rotatably connected with rotating tooth ring 9, and is limitingly connected with fixed tooth ring 6, rotating tooth ring 9 is fixedly connected with rotating half fan plate 10 in its inside, under the rotation of rotating tooth ring 9, rotating half fan plate 10 is rotated, to slide on fixed half fan plate 7, and form intersection with fixed half fan plate 7, adjust water flow, rotating half fan plate 10 is rotatably connected in the inside of rotating connecting shaft 8, and the bottom of rotating half fan plate 10 is slidably connected in the top of fixed half fan plate 7;

[0027] The top of the rotating gear ring 9 is fixedly connected with a limiting assembly, the limiting assembly comprises a fixed connection plate 11, a connecting threaded head 12 is connected with the fixed gear ring 6, the bottom of the fixed connection plate 11 is fixedly connected with the top of the rotating gear ring 9, the top of the fixed connection plate 11 is fixedly connected with the connecting threaded head 12, the connecting threaded head 12 is in a cylindrical shape, and an external thread is processed, which is used for threaded connection with other components, a plurality of countersunk bolts 13 are screwed in the fixed connection plate 11, and the countersunk bolts 13 are screwed in the corresponding threaded holes in the drill bit body 1 after penetrating through the fixed connection plate 11, so that the rotating gear ring 9 and the drill bit body 1 are firmly connected together, and the axial displacement of the rotating gear ring 9 is limited;

[0028] A plurality of long cutting blades 2 are fixedly connected outside the drill bit body 1, the long cutting blades 2 are in a strip shape, the long cutting blades 2 make a circular motion together with the drill bit body 1 when the drill bit rotates, the PDC drill teeth 5 on the outer side of the long cutting blades 2 are in contact with the rock, and the rock is broken by the cutting force generated by high-speed rotation, a plurality of short cutting blades 3 are fixedly connected outside the drill bit body 1, the short cutting blades 3 also make a circular motion together with the drill bit body 1, the cleaning hole heads 4 timely spray drilling fluid to take out the broken cuttings from the wellhead after the rock is broken by the long cutting blades 2, so that the drill bit is kept clean and works normally, a plurality of PDC drill teeth 5 are fixedly connected inside the long cutting blades 2, the long cutting blades 2 make a circular motion together with the drill bit body 1 when the drill bit rotates, the PDC drill teeth 5 on the outer side of the long cutting blades 2 are in contact with the rock, and the rock is broken by the cutting force generated by high-speed rotation, a plurality of cleaning hole heads 4 are fixedly connected inside the short cutting blades 3, a plurality of cleaning hole heads 4 are arranged inside the drill bit body 1, the cleaning hole heads 4 are used for spraying drilling fluid during drilling, and play a role in cooling the drill bit and cleaning the cuttings, and the drill bit body 1 is screwed in the plurality of countersunk bolts 13.

[0029] Working principle: first, the drill bit starts to rotate, the long cutting blade wing 2 and the short cutting blade wing 3 fixedly connected outside the drill bit body 1 make circular motion together with the drill bit body 1, so that the PDC drill bit 5 fixedly connected inside the long cutting blade wing 2 contacts with the rock, the cutting force generated by high-speed rotation breaks the rock, and after the long cutting blade wing 2 breaks the rock, the short cutting blade wing 3 follows, the hole head 4 is washed and the drilling fluid is sprayed in time, the broken rock is taken out of the wellhead, the drill bit is kept clean and normal work, and the adjustment of the drilling fluid makes the fixed tooth ring 6 fixedly connected at the bottom of the drill bit body 1 and the rotating tooth ring 9 rotatably connected at the top cooperate with each other, limit the water flow, because the rotating half-plate 10 fixedly connected inside the rotating tooth ring 9 rotates with the rotating tooth ring 9 under the rotation of the rotating tooth ring 9, and forms a cross with the fixed half-plate 7, so as to adjust the water flow, and the drill bit body 1 is screwedly connected inside a plurality of counterbores 13 outside, through the bolts, the limiting assembly fixedly connected at the top of the rotating tooth ring 9 is firmly connected with the drill bit body 1, and the axial displacement of the rotating tooth ring 9 is limited.

[0030] Finally, it should be pointed out that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features, any modification, equivalent replacement, improvement etc. made within the spirit and principles of the utility model, should be contained in the protection scope of the utility model.

Claims

1. An impact-resistant PDC bit for oil drilling, comprising a bit body (1), characterized in that: The bottom of the drill bit body (1) is fixedly connected with a fixed tooth ring (6), the inside of the fixed tooth ring (6) is fixedly connected with a fixed half fan plate (7), the inside of the fixed half fan plate (7) is fixedly connected with a rotating connection shaft (8), the top of the fixed tooth ring (6) is rotatably connected with a rotating tooth ring (9), the inside of the rotating tooth ring (9) is fixedly connected with a rotating half fan plate (10), and the top of the rotating tooth ring (9) is fixedly connected with a limiting assembly.

2. The impact-resistant PDC bit for oil drilling according to claim 1, characterized in that: The limiting assembly comprises a fixed connection plate (11), the bottom of the fixed connection plate (11) is fixedly connected with the top of the rotating tooth ring (9), the top of the fixed connection plate (11) is fixedly connected with a connecting threaded head (12), and the inside of the fixed connection plate (11) is threadedly connected with a plurality of countersunk bolts (13).

3. The impact-resistant PDC bit according to claim 1, wherein: The outside of the drill bit body (1) is fixedly connected with a plurality of long cutting blade wings (2), and the outside of the drill bit body (1) is fixedly connected with a plurality of short cutting blade wings (3).

4. The impact-resistant PDC bit according to claim 3, wherein: The inside of the long cutting blade wing (2) is fixedly connected with a plurality of PDC drill teeth (5), and the inside of the short cutting blade wing (3) is fixedly connected with a plurality of cleaning hole heads (4).

5. The impact-resistant PDC bit according to claim 2, wherein: The inside of the drill bit body (1) is provided with a plurality of cleaning hole heads (4), and the inside of the drill bit body (1) is threadedly connected outside a plurality of the countersunk bolts (13).

6. The impact-resistant PDC bit according to claim 1, wherein: The inside of the rotating half fan plate (10) is rotatably connected inside the rotating connection shaft (8), and the bottom of the rotating half fan plate (10) is slidably connected with the top of the fixed half fan plate (7).

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