Reducing drill bit of water injection well

Abstract

The utility model provides a variable-diameter drill bit for a water injection well, which relates to the technical field of well drilling devices and comprises a body, the body is of a hollow structure, one end of the body is provided with an assembling part, and the other end of the body is provided with a fixed drill bit; the scraping blades are evenly arranged on the body, assembling grooves matched with the scraping blades are evenly formed in the outer side of the body, and the scraping blades slide in the corresponding assembling grooves in the radial direction of the body. According to the drill bit, the at least two assembling grooves matched with the scraping blades are evenly formed in the outer side of the body, the scraping blades slide in the corresponding assembling grooves in the radial direction of the body, the assembling grooves enable the scraping blades to be kept balanced in the sliding process, the diameter changing stability of the drill bit is guaranteed, and the diameter changing effect on the drill bit is achieved.

Description

Technical Field

[0001] This utility model relates to the field of drilling equipment technology, specifically to a variable diameter drill bit for water injection wells. Background Technology

[0002] In the process of oil extraction, water injection wells play a vital role in maintaining formation pressure and improving crude oil recovery by injecting water into the formation. However, as the water injection time increases, scale is prone to form inside the wellbore. The presence of this scale not only reduces the flow area of ​​the wellbore and affects the water injection efficiency, but in severe cases, it can even cause the water injection well to become blocked and unable to inject water normally.

[0003] Currently, common solutions to the scaling problem in water injection wells include chemical cleaning and mechanical descaling. While chemical cleaning can dissolve scale to some extent, it suffers from high costs, environmental pollution, and potential corrosion of the wellbore. Mechanical descaling primarily uses traditional fixed-diameter drill bits, which have limitations in application. Due to the complex scaling conditions within water injection wells, with varying thickness and hardness in different areas, fixed-diameter drill bits struggle to adapt to different scaled regions, resulting in ineffective descaling and failure to completely remove scale, thus affecting the normal operation of the water injection well. Therefore, this invention proposes a variable-diameter drill bit for water injection wells to address these issues. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the defect that the existing water injection well variable diameter drill bit is difficult to adapt to the scaling area of ​​different sizes in the well barrel, thereby providing a water injection well variable diameter drill bit.

[0005] To solve the above problems, this utility model provides a variable diameter drill bit for water injection wells, comprising:

[0006] The main body has a hollow structure, with an assembly part at one end and a fixed drill bit at the other end.

[0007] At least two scraping blades are evenly distributed on the body. The outer side of the body is evenly distributed with mounting grooves that are adapted to the scraping blades. The scraping blades slide along the radial direction of the body in the corresponding mounting grooves.

[0008] Preferably, at least two assembly slots are evenly arranged with the center of the body as the center. Each assembly slot is provided with a guide post. The bottom of each scraping blade is provided with a limiting groove corresponding to the scraping blade. Each guide post is fitted with a spring. One end of the spring abuts against the bottom of the assembly slot, and the other end of the spring extends into and abuts against the limiting groove.

[0009] Preferably, each of the assembly slots is provided with a pair of through holes at the bottom on both sides of the guide post, the through holes connecting the assembly slot and the hollow structure inside the body.

[0010] Preferably, the main body is provided with a first fixing ring and a second fixing ring at both ends of the assembly groove, and the main body is provided with a first connecting part and a second connecting part that are adapted to the first fixing ring and the second fixing ring.

[0011] Preferably, the scraping blade has a protrusion in the middle and locking portions at both ends. One end of the first fixing ring and the second fixing ring are respectively connected to the first connecting portion and the second connecting portion, and the other end of the first fixing ring and the second fixing ring respectively abuts against a pair of locking portions.

[0012] Preferably, at least two through holes are evenly provided on the outer side of the body near the assembly part, and the through holes connect to the hollow structure inside the body.

[0013] Preferably, an alignment block is provided at the end of the main body away from the assembly part, and an alignment groove adapted to the alignment block is provided on the fixed drill bit, wherein the alignment groove and the alignment block are engaged.

[0014] Preferably, the fixed drill bit is provided with pin holes on both sides, the alignment block is provided with mounting holes corresponding to the pin holes on both sides, and a drill pin is provided between the mounting hole and the pin hole, and the drill pin connects the pin hole and the mounting hole respectively.

[0015] Preferably, the fixed drill bit is provided with multiple sets of mounting slots evenly arranged around its center, and tungsten steel blocks are respectively arranged in the mounting slots.

[0016] The variable-diameter drill bit for water injection wells provided by this utility model has the following beneficial effects:

[0017] 1. This utility model has at least two mounting grooves that are evenly arranged on the outer side of the main body and are adapted to the scraping blade. The scraping blade slides in the corresponding mounting groove along the radial direction of the main body. The mounting groove enables the scraping blade to maintain balance during the sliding process, ensuring the stability of the drill bit diameter change, so as to achieve the function of diameter change.

[0018] 2. This utility model also uses mounting grooves evenly distributed around the center of the main body to ensure that the scraping blade can maintain balance during sliding, thus guaranteeing the stability of the drill bit's diameter change. The spring provides elastic support for the scraping blade. When the main body changes position downhole, it will apply pressure to the scraping blade when facing scale layers of different thicknesses. When the scraping blade is subjected to external pressure, the spring will be compressed, causing the scraping blade to slide inward towards the inside of the main body. When the external pressure disappears, the spring will return to its original shape, pushing the scraping blade to slide outward, thereby realizing the extension and retraction function of the scraping blade and achieving the overall diameter change function. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the assembly of this utility model;

[0020] Figure 2 This is a side view of the structure of this utility model;

[0021] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 4 This is a schematic diagram of the spring structure installation of this utility model.

[0023] The reference numerals in the attached figures are as follows:

[0024] 1. Body; 2. Assembly part; 3. Fixed drill bit; 4. Scraping blade; 5. Assembly groove; 6. Guide post; 7. Limiting groove; 8. Spring; 9. Through hole; 10. First fixing ring; 11. Second fixing ring; 12. First connecting part; 13. Second connecting part; 14. Protrusion; 15. Locking part; 16. Through hole; 17. Alignment block; 18. Alignment groove; 19. Pin hole; 20. Drill bit pin; 22. Mounting groove; 23. Tungsten carbide block. Detailed Implementation

[0025] like Figure 1-4 As shown, this utility model provides a variable diameter drill bit for water injection wells, which includes:

[0026] The body 1 has a hollow structure inside. One end of the body 1 is provided with an assembly part 2, and the other end of the body 1 is provided with a fixed drill bit 3.

[0027] At least two scraping blades 4 are evenly distributed on the body 1. The outer side of the body 1 is evenly provided with mounting grooves 5 that are adapted to the scraping blades 4. The scraping blades 4 slide along the radial direction of the body 1 within their respective mounting grooves 5. Figure 1-4As shown, a variable-diameter drill bit for water injection wells has a body 1 made of 17-4PH material and a scraping blade 4 made of tungsten steel. The fixed drill bit 3 can scrape and remove scale layers below 43mm, and the scraping blade 4 can remove scale layers within 43-54mm. The assembly part 2 is connected to external equipment, and the connection method can be threaded connection, snap-fit ​​connection, etc., to ensure that the drill bit can be firmly installed on the external equipment. At least two mounting grooves 5 that are adapted to the scraping blade 4 are evenly arranged on the outer side of the body 1. The scraping blade 4 slides along the radial direction of the body 1 in the corresponding mounting groove 5. The mounting groove 5 enables the scraping blade 4 to maintain balance during sliding, ensuring the stability of the drill bit's diameter change, so as to achieve the effect of diameter change.

[0028] In some embodiments, at least two assembly slots 5 are evenly arranged around the center of the body 1. Guide posts 6 are respectively provided within the assembly slots 5. The bottom of the scraping blade 4 is respectively provided with limiting grooves 7 corresponding to the scraping blade 4. Springs 8 are respectively sleeved on the guide posts 6. One end of the spring 8 abuts against the bottom of the assembly slot 5, and the other end of the spring 8 extends into and abuts against the limiting groove 7. For example... Figure 1-4 As shown, the assembly grooves 5 are evenly distributed around the center of the body 1, so that the scraping blade 4 can maintain balance during sliding and ensure the stability of the drill bit diameter change. The function of the spring 8 is to provide elastic support for the scraping blade 4. When the body 1 changes position downhole, it will apply pressure to the scraping blade 4 when facing scale layers of different thicknesses. When the scraping blade 4 is subjected to external pressure, the spring 8 will be compressed, causing the scraping blade 4 to slide inward to the body 1. When the external pressure disappears, the spring 8 will return to its original shape and push the scraping blade 4 to slide outward, thereby realizing the extension and retraction function of the scraping blade 4, thus realizing the overall diameter change function.

[0029] In some embodiments, each of the assembly slots 5 has a pair of through holes 9 at its bottom on both sides of the guide post 6, the through holes 9 connecting the assembly slot 5 and the hollow structure inside the body 1. For example... Figure 1-4 As shown, the function of the through hole 9 is to allow the fluid in the body 1 to enter the assembly groove 5, providing lubrication and cooling for the sliding of the scraping blade 4, and at the same time, to discharge impurities and debris in the assembly groove 5, ensuring the normal operation of the scraping blade 4.

[0030] In some embodiments, the body 1 is provided with a first fixing ring 10 and a second fixing ring 11 at both ends of the assembly groove 5, and the body 1 is provided with a first connecting portion 12 and a second connecting portion 13 adapted to the first fixing ring 10 and the second fixing ring 11, respectively. For example... Figure 1-4As shown, one end of the first fixing ring 10 and the second fixing ring 11 are respectively connected to the first connecting part 12 and the second connecting part 13. They can be connected by thread, welding or other methods to ensure the stability of the scraping blade 4 after connection and to limit the scraping blade 4.

[0031] In some embodiments, a protrusion 14 is provided in the middle of the scraping blade 4, and locking portions 15 are provided at both ends of the scraping blade 4. One end of the first fixing ring 10 and the second fixing ring 11 are respectively connected to the first connecting portion 12 and the second connecting portion 13, and the other end of the first fixing ring 10 and the second fixing ring 11 respectively abuts against a pair of locking portions 15. Figure 1-4 As shown, the locking part 15 cooperates to limit the scraping blade 4 by using the first fixing ring 10 and the second fixing ring 11, ensuring that it slides in the radial direction of the body 1 and realizes the function of changing diameter.

[0032] In some embodiments, at least two through holes 16 are evenly provided on the outer side of the body 1 near the assembly part 2, and the through holes 16 connect to the hollow structure inside the body 1. Figure 1-4 As shown, the fluid inside the body 1 can flow out through the through hole 16 to flush and cool the environment around the drill bit. At the same time, it can also allow the debris generated during the drilling process to flow into the body 1 and be discharged with the water flow, thereby improving drilling efficiency.

[0033] In some embodiments, an alignment block 17 is provided at the end of the body 1 away from the assembly part 2, and an alignment groove 18 adapted to the alignment block 17 is provided on the fixed drill bit 3, the alignment groove 18 and the alignment block 17 engaging. Figure 1-4 As shown, when installing the fixed drill bit 3, the alignment block 17 is accurately inserted into the alignment groove 18, which plays a role in initial positioning and fixing, ensuring that the relative position of the fixed drill bit 3 and the body 1 is accurate. The shapes of the alignment block 17 and the alignment groove 18 are compatible, and they can be square or triangular to ensure that they are easy to align.

[0034] In some embodiments, pin holes 19 are respectively provided on both sides of the fixed drill bit 3, and mounting holes corresponding to the pin holes 19 are respectively provided on both sides of the alignment block 17. A drill pin 20 is respectively provided between the mounting hole and the pin hole 19, and the drill pin 20 connects the pin hole 19 and the mounting hole respectively. Figure 1-4 As shown, the drill bit pin 20 is inserted between the mounting hole and the pin hole 19 respectively to achieve a further fixed connection between the fixed drill bit 3 and the body 1, ensuring that the fixed drill bit 3 will not loosen or fall off during the drilling process. It can work with the stop block, snap ring or limiting boss to restrict the radial or axial movement of the pin.

[0035] In some embodiments, the fixed drill bit 3 is provided with multiple sets of mounting slots 22 evenly arranged around its center, and tungsten steel blocks 23 are respectively disposed in the mounting slots 22. Figure 1-4 As shown, the connection method can be snap-fit ​​or welding. Tungsten steel has the characteristics of high hardness and good wear resistance. Setting tungsten steel blocks 23 on the fixed drill bit 3 can improve the cutting ability and service life of the fixed drill bit 3, so that it can better adapt to the drilling operation of water injection well.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A variable-diameter drill bit for water injection wells, comprising: The body (1) has a hollow internal structure, and at least two scraping blades (4) are evenly arranged on the body (1). The outer side of the body (1) is evenly provided with mounting grooves (5) that are adapted to the scraping blades (4). The body (1) is characterized by: One end of the body (1) is provided with an assembly part (2), and the other end of the body (1) is provided with a fixed drill bit (3); The scraping blades (4) slide along the radial direction of the body (1) in the corresponding mounting grooves (5); At least two assembly slots (5) are evenly arranged around the center of the body (1). Each assembly slot (5) is provided with a guide post (6). The bottom of the scraping blade (4) is provided with a limiting groove (7) corresponding to the scraping blade (4). Each guide post (6) is fitted with a spring (8). One end of the spring (8) abuts against the bottom of the assembly slot (5), and the other end of the spring (8) extends into and abuts against the limiting groove (7).

2. The variable diameter drill bit for water injection wells according to claim 1, characterized in that: Each of the assembly slots (5) has a pair of through holes (9) at the bottom on both sides of the guide post (6), and the through holes (9) connect the assembly slot (5) and the hollow structure inside the body (1).

3. The variable diameter drill bit for water injection wells according to claim 1, characterized in that: The main body (1) is provided with a first fixing ring (10) and a second fixing ring (11) at both ends of the assembly groove (5). The main body (1) is provided with a first connecting part (12) and a second connecting part (13) that are adapted to the first fixing ring (10) and the second fixing ring (11).

4. The variable diameter drill bit for water injection wells according to claim 3, characterized in that: The scraping blade (4) has a protrusion (14) in the middle and a locking part (15) at both ends. One end of the first fixing ring (10) and the second fixing ring (11) are respectively connected to the first connecting part (12) and the second connecting part (13), and the other end of the first fixing ring (10) and the second fixing ring (11) respectively abut against a pair of the locking parts (15).

5. The variable diameter drill bit for water injection wells according to claim 1, characterized in that: At least two through holes (16) are evenly provided on the outer side of the body (1) near the assembly part (2), and the through holes (16) are connected to the hollow structure inside the body (1).

6. The variable diameter drill bit for water injection wells according to claim 1, characterized in that: The body (1) is provided with a positioning block (17) at one end away from the assembly part (2), and the fixed drill bit (3) is provided with a positioning groove (18) that is adapted to the positioning block (17), and the positioning groove (18) and the positioning block (17) are engaged.

7. The variable diameter drill bit for water injection wells according to claim 6, characterized in that: The fixed drill bit (3) is provided with pin holes (19) on both sides, and the alignment block (17) is provided with mounting holes corresponding to the pin holes (19) on both sides. A drill pin (20) is provided between the mounting hole and the pin hole (19), and the drill pin (20) connects the pin hole (19) and the mounting hole respectively.

8. The variable diameter drill bit for water injection wells according to claim 1, characterized in that: The fixed drill bit (3) is provided with multiple sets of mounting slots (22) evenly arranged with the center of the fixed drill bit (3) as the center, and tungsten steel blocks (23) are respectively arranged in the mounting slots (22).

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