Rotary scraping and impacting combined drill for water injection well

Abstract

The utility model provides a rotary scraping and impacting combined drill for a water injection well, which relates to the technical field of well drilling devices and comprises a bearing seat, a rotary shaft arranged in the bearing seat and rotatably connected with the bearing seat; the annular cutting drill bit is of a hollow structure, and the end, extending out of the bearing seat, of the rotating shaft extends into the annular cutting drill bit and is connected with the annular cutting drill bit; and one end of the percussion drill bit extends into the annular cutting drill bit and is connected with the rotating shaft. And the supporting mechanism is arranged on the rotating shaft and is in sliding connection with the rotating shaft, and the two ends of the supporting mechanism abut against the annular cutting drill bit and the bearing seat correspondingly. By means of dynamic adjustment of the supporting mechanism, the cleaning efficiency of a non-uniform scaling layer is remarkably improved, and the device is particularly suitable for the working conditions of soft and hard alternation and serious local blockage in a water injection well.

Description

Technical Field

[0001] This utility model relates to the field of drilling equipment technology, specifically to a rotary scraping impact combined drill for water injection wells. Background Technology

[0002] In the oil extraction process, water injection wells play a crucial role in maintaining formation pressure and improving oil recovery by injecting water into the formation. However, as the injection time increases, scale can easily form inside the wellbore. The presence of this scale not only reduces the flow area of ​​the wellbore and affects water injection efficiency, but in severe cases, it can even cause blockage of the well, preventing normal water injection.

[0003] A rotary scraping and impact drilling rig for water injection wells is a tool used for well workover operations to effectively remove scale and blockages (such as wax, rust, salt deposits, and sand) from the inner wall of the wellbore, restoring its flow capacity and improving water injection efficiency. However, its cleaning effect is affected when faced with scale of varying degrees. For example, it is less effective when dealing with scale in different locations or with varying hardness, causing the drill bit to spin idly and reducing cleaning efficiency. Therefore, this invention proposes a rotary scraping and impact drilling rig for water injection wells to address these problems. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the defect of poor cleaning effect of existing drilling devices when facing scale of different parts and different degrees of hardness, so as to provide a rotary scraping impact combination drill for water injection wells.

[0005] To solve the above problems, this utility model provides a rotary scraping impact drill for water injection wells, comprising:

[0006] A bearing housing, wherein a rotating shaft is disposed within the bearing housing, and the rotating shaft is rotatably connected to the bearing housing;

[0007] A circumferential cutting drill bit, wherein the circumferential cutting drill bit has a hollow internal structure, and one end of the rotating shaft extending out of the bearing seat extends into and connects to the circumferential cutting drill bit;

[0008] An impact drill bit, one end of which extends into the circumferential drill bit and is connected to the rotating shaft.

[0009] A support mechanism is mounted on and slidably connected to the rotating shaft, with its two ends abutting the circumferential drill bit and the bearing seat, respectively.

[0010] Preferably, the circumferential drill bit is provided with a sliding groove at one end near the bearing seat, and a square hole is provided in the sliding groove. The rotating shaft is provided with a square connecting shaft adapted to the square hole at one end near the sliding groove. The rotating shaft is slidably connected to the square hole through the square connecting shaft. The circumferential drill bit slides toward the bearing seat until the bottom of the sliding groove of the circumferential drill bit abuts against the end point of the rotating shaft to form a limit.

[0011] Preferably, a gap is provided between one end of the impact drill bit that extends into the circumferential drill bit and the circumferential drill bit;

[0012] The end of the impact drill bit that extends into the circumferential drill bit is provided with the alignment groove, and the square connecting shaft is provided with an alignment block near the alignment groove, the alignment block and the alignment groove being engaged.

[0013] Preferably, the end of the impact drill bit that extends into the circumferential drill bit is provided with a pin hole, the pin hole is connected to the alignment groove, the alignment block and the pin hole are provided with positioning grooves at corresponding positions, and a positioning pin is also provided between the pin hole and the positioning groove.

[0014] Preferably, at least two through holes are evenly arranged on the outer side of the circumferential drill bit with the center of the circumferential drill bit as the center.

[0015] Preferably, the bearing housing is provided with an abutting part at one end near the support mechanism, and at least three first rotating parts are evenly provided at the edge of the bearing housing near the support mechanism.

[0016] Preferably, the support mechanism includes a support arm seat, which is sleeved on the rotating shaft and slidably connected to the rotating shaft. One end of the support arm seat abuts against the circumferential drill bit, and the other end extends toward the bearing seat and is provided with an alignment ring.

[0017] At least three second rotating parts are evenly arranged on the outer edge of the support arm seat. A first support arm and a second support arm are arranged between the second rotating part and the first rotating part. One end of the first support arm is rotatably connected to the first rotating part, the other end of the first support arm is rotatably connected to one end of the second support arm, and the other end of the second support arm is rotatably connected to the second rotating part.

[0018] Preferably, a spring is also fitted on the rotating shaft, with one end of the spring abutting against the alignment ring and the other end abutting against the abutting part.

[0019] The rotary scraping impact combined drill for water injection wells provided by this utility model has the following beneficial effects:

[0020] 1. This utility model addresses the challenges of dealing with scale of varying hardness. For minor scale buildup, the circumferential drill bit and impact drill bit maintain their extended position due to their own weight, allowing the circumferential drill bit to remove the scale layer. For more severe scale buildup, the circumferential drill bit slides away from the impact drill bit due to the pressure from the scale layer. At this point, the support mechanism opens and comes into contact with the inner wall of the tubing, providing radial support for both the impact drill bit and the circumferential drill bit. Furthermore, when dealing with scale layers of different hardness or diameter, the support mechanism can adaptively adjust its contact pressure with the inner diameter of the tubing to prevent idling.

[0021] 2. This utility model also uses a structure composed of a first support arm, a second support arm, a first rotating part, and a second rotating part, which is similar to a telescopic linkage mechanism. When the circumferential cutting drill bit is subjected to forces in different directions, the direction and magnitude of the supporting force can be adjusted by the rotation and extension of the support arm, thereby ensuring the stability of the entire device. The support mechanism dynamically adjusts the extension of the circumferential cutting drill bit according to the scaling resistance, ensuring that the scraping teeth of the circumferential cutting drill bit always effectively contact the scaling layer and prevent dry running.

[0022] 3. This utility model also significantly improves the cleaning efficiency of non-uniform scale layers by utilizing the dynamic adjustment of the support mechanism, and is especially suitable for working conditions in water injection wells with alternating soft and hard scale layers and severe local blockage. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the overall assembly of this utility model;

[0024] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0025] Figure 3 This is a schematic diagram of the installation of the abutment part structure of this utility model;

[0026] Figure 4 This is a schematic diagram of the installation of the square connecting shaft structure of this utility model.

[0027] The reference numerals in the attached figures are as follows:

[0028] 1. Bearing housing; 2. Rotating shaft; 3. Ring cutting drill bit; 4. Impact drill bit; 5. Sliding groove; 6. Square hole; 7. Square connecting shaft; 8. Alignment groove; 9. Alignment block; 10. Pin hole; 11. Locating pin; 12. Locating groove; 13. Through hole; 14. Abutment part; 15. First rotating part; 16. Support arm seat; 17. Alignment ring; 18. Second rotating part; 19. First support arm; 20. Second support arm; 21. Spring. Detailed Implementation

[0029] like Figure 1-4As shown, this utility model provides a rotary scraping impact drill for water injection wells, which includes:

[0030] A bearing housing 1, wherein a rotating shaft 2 is disposed within the bearing housing 1, and the rotating shaft 2 is rotatably connected to the bearing housing 1;

[0031] A circumferential cutting drill bit 3, wherein the circumferential cutting drill bit 3 has a hollow internal structure, and one end of the rotating shaft 2 extending out of the bearing seat 1 extends into and connects to the circumferential cutting drill bit 3;

[0032] Impact drill bit 4, one end of which extends into the circumferential drill bit 3 and is connected to the rotating shaft 2.

[0033] A support mechanism is mounted on and slidably connected to the rotating shaft 2, with its two ends abutting against the circumferential drill bit 3 and the bearing seat 1, respectively. Figure 1-4 As shown, a rotary scraping impact drill for water injection wells includes a bearing housing 1 for connecting an external device, allowing one end of the rotatably connected rotating shaft 2 to be connected to the external device for transmission. The connection can be achieved via ball bearings. The drill bit 4 has a hollow annular structure with an inner diameter slightly larger than its outer diameter. Its outer edge and outer side are inlaid with carbide scraping teeth for rotary scraping of scale on the well wall. The head of the impact drill bit 4 has tapered impact teeth for axially impacting and breaking up hard scale. The gap between the impact drill bit 4 and the inner wall of the circumferential cutting drill bit 3 is 2-5 mm to ensure independent movement without interference. A support mechanism abuts against the circumferential cutting drill bit. Between 3 and bearing housing 1, when facing scale of different hardness, for slight scale, due to the weight of the circumferential drill bit 3 and the impact drill bit 4, the support mechanism remains extended, and the circumferential drill bit 3 removes the scale layer; when facing a more severe scale layer, due to the compression of the scale layer, the circumferential drill bit slides away from the impact drill bit 4. At this time, the support mechanism is opened, and its support mechanism abuts against the inner wall of the oil pipe, forming radial support for the impact drill bit 4 and the circumferential drill bit. At the same time, when facing scale layers of different hardness or diameter (different thickness), its support mechanism can adaptively adjust the contact pressure with the inner diameter of the oil pipe (or the scale layer) to avoid idling.

[0034] In some embodiments, the circumferential drill bit 3 has a sliding groove 5 at one end near the bearing seat 1, and a square hole 6 is provided in the sliding groove 5. The rotating shaft 2 has a square connecting shaft 7 adapted to the square hole 6 at one end near the sliding groove 5. The rotating shaft 2 is slidably connected to the square hole 6 via the square connecting shaft 7. The circumferential drill bit 3 slides towards the bearing seat 1 until the bottom of the sliding groove 5 of the circumferential drill bit 3 abuts against the end point of the rotating shaft 2, forming a limit. Figure 1-4As shown, the circumferential drill bit 3 has a sliding groove 5 at one end near the bearing seat 1, and a square hole 6 is provided in the sliding groove 5. The rotating shaft 2 has a square connecting shaft 7 that matches the square hole 6 at one end near the sliding groove 5. This not only enables a reliable connection between the rotating shaft 2 and the circumferential drill bit 3, but also allows the circumferential drill bit 3 to slide along the axial direction of the rotating shaft 2 within a certain range. When the circumferential drill bit 3 slides toward the bearing seat 1, it reaches the end point of the rotating shaft 2 when the bottom of the sliding groove 5 of the circumferential drill bit 3 abuts against the end point of the rotating shaft 2, thus forming a limit and ensuring the positional stability of the circumferential drill bit 3 during operation.

[0035] Specifically, a gap is provided between one end of the impact drill bit 4 that extends into the circumferential drill bit 3 and the circumferential drill bit 3; the end of the impact drill bit 4 that extends into the circumferential drill bit 3 is provided with the alignment groove 8, and an alignment block 9 is provided near the alignment groove 8 on the square connecting shaft 7, and the alignment block 9 and the alignment groove 8 are engaged. Figure 1-4 As shown, in order to ensure that the impact drill bit 4 can freely perform impact actions during operation, a gap is set between the end of the impact drill bit 4 that extends into the circumferential drill bit 3 and the circumferential drill bit 3. The alignment block 9 and the alignment groove 8 are engaged with each other, realizing the initial positioning connection between the impact drill bit 4 and the rotating shaft 2.

[0036] Specifically, the impact drill bit 4 has a pin hole 10 at one end extending into the circumferential drill bit 3. The pin hole 10 connects to the alignment groove 8. The alignment block 9 has a positioning groove 12 corresponding to the pin hole 10. A positioning pin 11 is also provided between the pin hole 10 and the positioning groove 12. Figure 1-4 As shown, the pin hole 10 connects to the alignment groove 8, and the alignment block 9 is provided with a positioning groove 12 corresponding to the pin hole 10. A positioning pin 11 is installed between the pin hole 10 and the positioning groove 12. Through the fixing action of the positioning pin 11, the impact drill bit 4 is firmly fixed on the rotating shaft 2, so that the impact drill bit 4 will not loosen or fall off during operation. The connection method can be through the positioning pin 11. At the same time, with the help of the stop block, snap ring or limiting boss, the radial or axial movement of the positioning pin 11 is restricted to achieve further connection.

[0037] Specifically, at least two through holes 13 are evenly arranged on the outer side of the circumferential drill bit 3 with the center of the circumferential drill bit 3 as the center. For example Figure 1-4 As shown, the through hole 13 allows the chips that enter the circumferential drill bit 3 to be released during the rotation of the circumferential drill bit 3. At the same time, it allows the high-pressure fluid injected from the outside to form an annular jet through the through hole 13, which helps to dilute the soft scale and also cools the drill bit and carries away the chips.

[0038] In some embodiments, the bearing housing 1 has an abutment portion 14 at one end near the support mechanism, and at least three first rotating portions 15 are evenly arranged along the edge of the bearing housing 1 at one end near the support mechanism. For example... Figure 1-4 As shown, the abutment part 14 is used to limit the support mechanism, and the first rotating part 15 is used to connect with the support mechanism.

[0039] Specifically, the support mechanism includes a support arm seat 16, which is sleeved on the rotating shaft 2 and slidably connected to the rotating shaft 2. One end of the support arm seat 16 abuts against the circumferential drill bit 3, and the other end extends toward the bearing seat 1 and is provided with an alignment ring 17.

[0040] At least three second rotating parts 18 are evenly arranged along the outer edge of the support arm seat 16. A first support arm 19 and a second support arm 20 are provided between each of the second rotating parts 18 and the first rotating part 15. One end of the first support arm 19 is rotatably connected to the first rotating part 15, and the other end of the first support arm 19 is rotatably connected to one end of the second arm 20. The other end of the second arm 20 is rotatably connected to the second rotating part 18. Figure 1-4 As shown, the entire support mechanism slides by sliding the support arm on the rotating shaft 2. All rotating connections are achieved via rotating rods. The structure consisting of the first support arm 19, the second support arm 20, the first rotating part 15, and the second rotating part 18 is similar to a telescopic linkage mechanism. When the circumferential drill bit 3 is subjected to forces in different directions, the direction and magnitude of the supporting force are adjusted by the rotation and extension of the support arms, thus ensuring the stability of the entire device. The support mechanism dynamically adjusts the extension of the circumferential drill bit 3 according to the scaling resistance, ensuring that the scraping teeth of the circumferential drill bit 3 always effectively contact the scaling layer and prevent idling. This dynamic adjustment of the support mechanism significantly improves the cleaning efficiency of non-uniform scaling layers, making it particularly suitable for conditions in water injection wells with alternating soft and hard scale and severe localized blockages.

[0041] Specifically, a spring 21 is also fitted onto the rotating shaft 2, with one end of the spring 21 abutting against the alignment ring 17 and the other end abutting against the abutting part 14. For example... Figure 1-4 As shown, spring 21 acts as an elastic buffer. When the circumferential drill bit 3 encounters greater resistance, spring 21 will compress, thus buffering the impact and preventing damage to the device from excessive impact.

[0042] 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 rotating drag and percussion combination drill for water injection wells, characterized in that, The utility model relates to a water injection well rotary scraping impact combined drill, including: Bearing seat (1), be provided with rotating shaft (2) in bearing seat (1), rotating shaft (2) and bearing seat (1) rotation connection are connected; Ring cutting drill bit (3), ring cutting drill bit (3) are hollow structure in, the one end of rotating shaft (2) that stretches out bearing seat (1) stretches into and is connected ring cutting drill bit (3); Impact drill bit (4), one end of impact drill bit (4) stretches into ring cutting drill bit (3) and rotating shaft (2) connection Support mechanism, be provided with rotating shaft (2) and rotating shaft (2) sliding connection, the both ends of support mechanism are respectively abutted ring cutting drill bit (3) and bearing seat (1).

2. The water injection well rotary scraping impact combined drill according to claim 1, wherein: The end of the ring cutting drill bit (3) close to the bearing seat (1) is provided with a sliding groove (5), the sliding groove (5) is provided with a square hole (6), the end of the rotating shaft (2) close to the sliding groove (5) is provided with a square connecting shaft (7) matched with the square hole (6), the rotating shaft (2) is slidingly connected with the square hole (6) through the square connecting shaft (7), the ring cutting drill bit (3) slides towards the bearing seat (1) until the bottom of the sliding groove (5) of the ring cutting drill bit (3) abuts at the end point of the rotating shaft (2) to form a limit.

3. The water injection well rotary scraping impact combined drill according to claim 2, wherein: A gap is provided between the end of the impact drill bit (4) extending into the ring cutting drill bit (3) and the ring cutting drill bit (3); The end of the impact drill bit (4) extending into the ring cutting drill bit (3) is provided with a positioning groove (8), the square connecting shaft (7) close to the positioning groove (8) is provided with a positioning block (9), and the positioning block (9) is clamped with the positioning groove (8).

4. The water injection well rotary scraping impact combined drill according to claim 3, wherein: The end of the impact drill bit (4) extending into the ring cutting drill bit (3) is provided with a pin hole (10) communicating with the positioning groove (8), the positioning block (9) and the pin hole (10) are provided with a positioning groove (12) at the corresponding position, and a positioning pin (11) is further provided between the pin hole (10) and the positioning groove (12).

5. The water injection well rotary scraping impact combined drill according to claim 2, wherein: At least two through holes (13) are uniformly provided outside the ring cutting drill bit (3) with the center of the ring cutting drill bit (3) as the center.

6. The water injection well rotary scraping impact combined drill according to claim 1, wherein: The end of the bearing seat (1) close to the support mechanism is provided with an abutting portion (14), and at least three first rotating portions (15) are uniformly provided at the edge of the end of the bearing seat (1) close to the support mechanism.

7. The water injection well rotary scraping impact combined drill according to claim 6, wherein: The support mechanism comprises a support arm base (16) sleeved on the rotating shaft (2) and in sliding connection with the rotating shaft (2), one end of the support arm base (16) abutting against the ring bit (3), the other end extending to the bearing seat (1) and being provided with an alignment ring (17); The outer side edge of the support arm base (16) is further uniformly provided with at least three second rotating parts (18), and the first rotating part (15) and the second rotating part (18) are both provided with a first support arm (19) and a second support arm (20), one end of the first support arm (19) being in rotating connection with the first rotating part (15), the other end of the first support arm (19) being in rotating connection with one end of the second support arm (20), the other end of the second support arm (20) being in rotating connection with the second rotating part (18).

8. The combination drill of the water injection well rotating scraping and impacting according to claim 7, characterized in that: The rotating shaft (2) is further sleeved with a spring (21), one end of the spring (21) abutting against the alignment ring (17), the other end abutting against the abutting part (14).

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