High-strength drill bit for petroleum drilling

Abstract

The utility model belongs to the technical field of petroleum drilling, and particularly relates to a high-strength drill bit for petroleum drilling, which comprises a drill bit body, a plurality of drilling ribs are arranged on the outer side of the drill bit body, a blocking face is arranged at one end of the drill bit body, and a plurality of liquid leakage holes are arranged at one end of the outer side of the drill bit body and far away from the blocking face. A cooling liquid pipe is assembled in the liquid leakage hole, a blocking mechanism is arranged in the liquid leakage hole and used for blocking opening and closing of the liquid leakage hole, the blocking mechanism comprises a fixing rod which is fixed to the inner side of the liquid leakage hole and close to the end of the liquid leakage hole, the outer side of the fixing rod is rotationally connected with a blocking plate, and a torsional spring is further installed on the outer side of the fixing rod. And one end and the other end of the torsional spring are respectively connected with the barrier plate and the fixed rod. According to the utility model, the release of the cooling liquid can be intelligently controlled according to the temperature change when the drill bit works, the drill bit can be effectively cooled at a high temperature, and meaningless consumption of the cooling liquid and invasion of impurities can be prevented when the temperature drops.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil drilling, and particularly relates to a high-strength drill bit for oil drilling. Background Art

[0002] In the oil drilling industry, the drill bit is a crucial tool in the drilling operation. During the drilling process, the drill bit will have intense friction with the rock, resulting in a sharp rise in the temperature of the drill bit. The high temperature will not only accelerate the wear of the drill bit and reduce its service life, but also may affect the drilling efficiency and safety. To alleviate this problem, a cooling system is usually adopted in the traditional drill bit design, such as the injection of water-based or oil-based coolant, to reduce the working temperature of the drill bit;

[0003] However, the existing cooling systems have some limitations. Firstly, the traditional coolant injection system often lacks a temperature sensing mechanism and cannot automatically adjust the coolant flow according to the actual temperature change of the drill bit. This may lead to continuous injection of coolant when the temperature of the drill bit is relatively low, resulting in waste of coolant and increased processing cost of drilling fluid;

[0004] Secondly, when the drill bit stops working or the temperature drops, the continuous injection of coolant may cause the intrusion of impurities in the drilling fluid. These impurities may block the release holes of the coolant, affect the normal operation of the drill bit, and even cause damage to the drill bit.

[0005] To solve the above problems, some drill bit designs have tried to introduce temperature sensing elements, such as thermosensitive materials or temperature sensors, to achieve intelligent control of the coolant. However, these designs are often complex in structure, high in cost, and insufficient in reliability in the harsh drilling environment, and are prone to failures;

[0006] Therefore, there is an urgent need for a new type of drill bit design to solve the above problems. Content of the Utility Model

[0007] The purpose of the utility model is to provide a high-strength drill bit for oil drilling, which can intelligently control the release of coolant according to the temperature change when the drill bit is working, can effectively cool the drill bit at high temperature, and can prevent unnecessary consumption of coolant and intrusion of impurities when the temperature drops.

[0008] The technical solution adopted by the utility model is specifically as follows:

[0009] A high-strength drill bit for oil drilling, comprising a drill bit body. A plurality of drilling ribs are arranged on the outer side of the drill bit body. One end of the drill bit body is provided with a blocking surface. A plurality of liquid leakage holes are arranged on the outer side of the drill bit body and at one end far from the blocking surface. A coolant pipe is assembled in the liquid leakage holes, and a blocking mechanism is arranged inside the liquid leakage holes. The blocking mechanism is used to block the opening and closing of the liquid leakage holes.

[0010] The blocking mechanism includes a fixing rod fixed inside the liquid leakage hole and close to the end of the liquid leakage hole. A blocking plate is rotatably connected to the outer side of the fixing rod. A torsion spring is also installed on the outer side of the fixing rod, and one end and the other end of the torsion spring are respectively connected to the blocking plate and the fixing rod;

[0011] A pushing member is also installed inside the liquid leakage hole. The pushing member is used to push one side of the blocking plate downward.

[0012] The pushing member is a shape memory metal. The shape memory metal is horizontally fixed on the inner wall of the liquid leakage hole. When the shape memory metal is heated, it bends upward to push one side of the blocking plate upward.

[0013] A plurality of drilling blocks are arranged on the outer side of the drilling ribs and at one end far from the blocking surface. A plurality of grinding blocks are fixed on the outer side of the drilling ribs and at one end close to the blocking surface.

[0014] One side of each drilling rib is set as an arc surface, and the other side is set as a mounting post. And a plurality of the liquid leakage holes are respectively arranged between the arc surfaces and the mounting posts of every two drilling ribs.

[0015] The blocking surface is conical, and a thread is arranged on the outer side of the blocking surface.

[0016] The technical effects achieved by the present utility model are as follows:

[0017] The present utility model can intelligently control the release of the coolant according to the temperature change during the operation of the drill bit, which can not only effectively cool the drill bit at high temperature, but also prevent the unnecessary consumption of the coolant and the intrusion of impurities when the temperature drops, thereby improving the service life of the drill bit and the efficiency of the drilling operation. Description of the Drawings

[0018] Figure 1 is a structural schematic diagram of the present utility model;

[0019] Figure 2 is a structural schematic diagram among the arc surface, the mounting post and the drilling block in the present utility model;

[0020] Figure 3 is a structural schematic diagram among the grinding block, the drilling block and the blocking surface in the present utility model;

[0021] Figure 4 It is a schematic structural diagram among the torsion spring, the baffle plate and the shape memory alloy in the present utility model.

[0022] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0023] 1. Drill bit body; 2. Drilling ribs; 3. Drilling blocks; 4. Liquid leakage holes; 5. Baffle plate; 6. Fixed rod; 7. Torsion spring; 8. Grinding blocks; 9. Arc surface; 10. Blocking surface; 11. Mounting posts; 12. Shape memory alloy. Specific embodiments

[0024] In order to make the purpose and advantages of the present utility model clearer, the present utility model will be specifically described below in conjunction with embodiments. It should be understood that the following text only describes one or several specific implementation manners of the present utility model, and does not strictly limit the scope of protection specifically claimed by the present utility model.

[0025] As Figures 1-4 shown, a high-strength drill bit for oil drilling includes a drill bit body 1. A plurality of drilling ribs 2 are arranged on the outer side of the drill bit body 1. When the drill bit body 1 rotates, it can drive the drilling ribs 2 to rotate. Through the rotation of the drilling ribs 2, the geology can be tunnelled. One end of the drill bit body 1 is provided with a blocking surface 10. The drill bit is installed on the drilling rig through the blocking surface 10. Refer to the attached Figure 3 shown, the blocking surface 10 is conical, and a thread is arranged on the outer side of the blocking surface 10. Through this setting, the installation of the blocking surface 10 is not easy to fall off, and the thread is opposite to the drilling rotation direction of the drill bit, so that the drill bit will not fall off during drilling;

[0026] Refer to the attached Figure 3 shown, a plurality of drilling blocks 3 are arranged on the outer side of the drilling ribs 2 and at the end far from the blocking surface 10. Through the arrangement of the drilling blocks 3, the drilling blocks 3 can increase the friction with rocks or soil during the tunnelling of the drill bit, thereby ensuring the tunnelling effect. A plurality of grinding blocks 8 are fixed on the outer side of the drilling ribs 2 and at the end close to the blocking surface 10. Through the arrangement of the grinding blocks 8, the grinding blocks 8 can grind the hole after tunnelling to ensure that the whole hole is cylindrical, providing certain help for subsequent work;

[0027] A plurality of liquid leakage holes 4 are arranged on the outer side of the drill bit body 1 and at the end far from the blocking surface 10. A coolant pipe is assembled in the liquid leakage holes 4. The coolant pipe is used to discharge coolant to cool the drill bit and ensure the strength of the drill bit during tunnelling;

[0028] One side of each drilling rib 2 is set as an arc surface 9, and the other side is set as a mounting post 11. A plurality of liquid leakage holes 4 are respectively arranged between the arc surface 9 and the mounting post 11 of every two drilling ribs 2. Through this setting, when the drill bit rotates in, the rock block is blocked by the mounting post 11, and the rock block is rotated in by the arc surface 9. Through this setting, the impurities entering the liquid leakage hole 4 are further reduced;

[0029] And a blocking mechanism is arranged inside the liquid leakage hole 4, and the blocking mechanism is used to block the opening and closing of the liquid leakage hole 4.

[0030] Refer to the appendix Figure 4 , the blocking mechanism includes a fixing rod 6 fixed inside the liquid leakage hole 4 and close to the end of the liquid leakage hole 4. A blocking plate 5 is rotatably connected to the outside of the fixing rod 6. The blocking plate 5 is used to block the liquid leakage hole 4, so as to prevent impurities such as small stones and soil from entering the liquid leakage hole 4 when the drill bit is tunneling, causing blockage of the liquid leakage hole 4, and can block the lubricating liquid to prevent waste. A torsion spring 7 is also installed on the outside of the fixing rod 6, and one end and the other end of the torsion spring 7 are respectively connected to the blocking plate 5 and the fixing rod 6. Through the setting of the torsion spring 7, the torsion spring 7 can apply a certain force to the blocking plate 5, so that the blocking plate 5 can always be flush with the liquid leakage hole 4 to block the liquid leakage hole 4;

[0031] A pushing member is also installed inside the liquid leakage hole 4, and the pushing member is used to push one side of the blocking plate 5 downward.

[0032] Refer to the appendix Figure 4 , the pushing member is a shape memory metal 12. The shape memory metal 12 is horizontally fixed on the inner wall of the liquid leakage hole 4, and when the shape memory metal 12 is heated, it bends upward to push one side of the blocking plate 5 upward. When the shape memory metal 12 is heated, it can bend, so as to push one side of the blocking plate 5 upward, so that the blocking plate 5 cancels the blockage of the liquid leakage hole 4. At this time, the solenoid valve in the coolant pipe opens to discharge the coolant to cool the drill bit. When the temperature drops after cooling, the shape memory metal 12 returns to its original shape due to the decrease in heat, and re-forms a rectangular strip, so that the blocking plate 5 re-blocks the liquid leakage hole 4 through the torsion spring 7 to prevent the liquid leakage hole 4 from being blocked by crushed stones, etc.;

[0033] The liquid leakage hole 4 is an existing mature technology. It is a special metal material that undergoes plastic deformation in a certain temperature range and can return to its original macroscopic shape in another temperature range. The critical temperature at which it undergoes shape transformation is called the "transition temperature", also called the "phase change temperature". When the liquid leakage hole 4 is in an environment below the phase change temperature, its shape is called the "low-temperature phase", and when it is in an environment above the phase change temperature, its shape is called the "high-temperature phase".

[0034] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model. The structures, devices, and operation methods not specifically described and explained in the present utility model are implemented according to the conventional means in the art without special instructions and limitations.

Claims

1. A high-strength drill bit for oil drilling, comprising a drill bit body (1), characterized in that: A plurality of drilling ribs (2) are arranged on the outside of the drill body (1), a blocking surface (10) is arranged at one end of the drill body (1), a plurality of leakage holes (4) are arranged on the outside of the drill body (1) and at one end away from the blocking surface (10), a cooling liquid pipe is installed in the leakage hole (4), and a blocking mechanism is arranged inside the leakage hole (4), and the blocking mechanism is used to block the leakage hole (4) from opening and closing.

2. A high-strength drill bit for oil drilling according to claim 1, characterized in that: The blocking mechanism comprises a fixing rod (6) fixed inside the leakage hole (4) and close to the end of the leakage hole (4); the outer side of the fixing rod (6) is rotatably connected to a blocking plate (5); a torsion spring (7) is also installed on the outer side of the fixing rod (6); one end and the other end of the torsion spring (7) are respectively connected to the blocking plate (5) and the fixing rod (6); A pushing member is also installed on the inner side of the liquid leakage hole (4), and the pushing member is used to push one side of the blocking plate (5) to move downward.

3. A high-strength drill bit for oil drilling according to claim 2, characterized in that: The pushing member is a memory metal (12), the memory metal (12) is transversely fixed on the inner wall of the leakage hole (4), and the memory metal (12) bends upward when heated to push one side of the blocking plate (5) upward.

4. A high-strength drill bit for oil drilling according to claim 1, characterized in that: A plurality of drilling blocks (3) are arranged on the outer side of the drilling rib (2) and at one end away from the blocking surface (10), and a plurality of grinding blocks (8) are fixed on the outer side of the drilling rib (2) and at one end close to the blocking surface (10).

5. The high-strength drill bit for oil drilling according to claim 1, characterized in that: One side of each drilling rib (2) is provided as an arc surface (9), and the other side is provided as a mounting column (11), and the plurality of leakage holes (4) are respectively provided between the arc surfaces (9) and the mounting columns (11) of every two drilling ribs (2).

6. The high-strength drill bit for oil drilling according to claim 1, characterized in that: The blocking surface (10) is arranged in a conical shape, and a thread is arranged on the outer side of the blocking surface (10).

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