Orifice device for recharging slurry into drill hole

Abstract

The utility model relates to the technical field of drill holes, in particular to an orifice device for recharging slurry into a drill hole, which comprises an outer shell, a sleeve, a sealing ring and a gland, the outer shell further comprises a first shell and a second shell, the end of the second shell is rotatably arranged on the first shell, the sealing ring is arranged on the second shell, the first shell is connected with the sleeve, and the gland is arranged on the sleeve. The gland is located in the second shell and makes contact with the sealing ring, and the problem that when the drill rod is in the rotating state, the sealing ring is generally fixed, and consequently severe friction is generated between the drill rod and the sealing ring is solved. And the friction not only accelerates the abrasion of the sealing ring and shortens the service life of the sealing ring, but also causes slurry leakage due to sealing failure and affects the construction safety and efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of drilling, and specifically to a borehole device for backfilling mud into a borehole. Background Technology

[0002] During drilling operations, the wellhead device is a key piece of equipment used to control the backfilling of drilling mud. Its main function is to ensure that the mud can be smoothly injected into the borehole while preventing wellhead collapse and mud leakage. This device typically consists of a sealing assembly, a drill pipe channel, and a fixing structure. The sealing assembly seals the gap between the drill pipe and the wellhead to ensure the stability and reliability of mud backfilling.

[0003] However, when the drill pipe is rotating, the sealing ring is usually stationary, leading to intense friction between the drill pipe and the sealing ring. This friction not only accelerates the wear of the sealing ring and reduces its service life, but also causes mud leakage due to seal failure, affecting construction safety and efficiency. Furthermore, frequent replacement of the sealing ring not only increases maintenance costs but may also lead to construction interruptions, reducing overall operational efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a borehole device for reinjecting drilling mud into the borehole, which solves the technical problem of severe friction between the drill rod and the sealing ring when the drill rod is rotating while the sealing ring is usually stationary. This friction not only accelerates the wear of the sealing ring and reduces its service life, but also leads to mud leakage due to seal failure, affecting construction safety and efficiency.

[0005] This utility model is achieved through the following technical solution:

[0006] A borehole re-injection device for drilling mud includes a housing, a casing, a sealing ring, and a gland. The housing comprises a first housing and a second housing, with the end of the second housing rotatably mounted on the first housing. The sealing ring is disposed on the second housing. The first housing and the casing are connected. The gland is located inside the second housing and contacts the sealing ring. When the drill rod rotates, the drill rod drives the second housing to rotate on the first housing via the sealing ring. The sealing ring and the drill rod are relatively stationary. The wear on the sealing ring during drill rod rotation is reduced, thereby protecting the sealing ring and extending its service life. This device solves the technical problem of severe friction between the drill rod and the sealing ring when the drill rod is rotating but the sealing ring is usually stationary.

[0007] Furthermore, the first housing has an annular groove, and the second housing is rotatably disposed within the annular groove via a slider. The first housing also has a straight groove communicating with the annular groove. The second housing includes a first movable housing and a second movable housing. A first sealing ring is disposed on the first movable housing, and a second sealing ring is disposed on the second movable housing. The two movable housings contact each other to form a complete circle. This application, through a separable movable housing structure, achieves the temporal separation of drill rod installation and sealing ring operation. Specifically, during drill rod penetration, the sealing ring is in an open state, completely avoiding relative movement with the drill rod; only after the drill rod is positioned does the sealing ring achieve its sealing function through the closing of the two movable housings. This completely eliminates frictional damage to the sealing ring during drill rod insertion, significantly extending the service life of the sealing element.

[0008] Furthermore, a locking part is provided on the side wall where the two movable shells come into contact.

[0009] Furthermore, the first sealing ring has a recessed portion, and the second sealing ring has a protruding portion, with the recessed portion and the protruding portion fitting together.

[0010] Furthermore, the locking part includes a placement groove on the side wall of the first movable housing facing the second movable housing, and a placement block on the side wall of the second movable housing facing the first movable housing that mates with the placement groove. The engagement of the placement block and the groove forms a rigid limit, which can resist the tendency of the first and second movable housings to separate due to internal fluid pressure or external vibration, and prevent leakage due to accidental detachment of the sealing structure.

[0011] Furthermore, the mating surfaces of the protrusions and recesses are serrated or wavy.

[0012] Furthermore, the sealing ring is made of fluororubber.

[0013] Furthermore, a limiting block is provided at the end of the straight groove.

[0014] Furthermore, the first housing and the sleeve are connected by bolts.

[0015] Furthermore, a pull block is also provided on the second housing. This allows the operator to apply directional pulling force to the first and second movable housings, avoiding uneven force distribution or housing damage caused by manual operation.

[0016] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0017] 1. This application rotatably mounts the second housing onto the first housing and sets the sealing ring on the inner peripheral wall of the second housing. When the drill rod rotates, the drill rod drives the second housing to rotate on the first housing through the sealing ring. The sealing ring and the drill rod are relatively stationary. The wear on the sealing ring is reduced when the drill rod rotates, thereby protecting the sealing ring and extending its service life.

[0018] 2. By setting an annular groove and a straight groove, this application creates two states for the first and second movable shells. During the drill rod insertion process, the sealing ring is in the open state, completely avoiding relative movement with the drill rod. Only after the drill rod is positioned can the sealing ring achieve the sealing function through the closing of the two movable shells, eliminating frictional damage to the sealing ring during the drill rod insertion process and significantly extending the service life of the sealing element.

[0019] 3. This application improves sealing reliability by making the mating surfaces of the protrusion and the recess serrated or wavy. Compared with planar contact, the serrated or wavy structure increases the actual contact area. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure in Embodiment 2 of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the first and second movable shells of this utility model when they are closed;

[0023] Figure 3 This is a schematic diagram of the structure of the first and second movable shells of this utility model when they are detached from each other.

[0024] Figure 4 This is a schematic diagram of the specific structure of the connection between the straight groove and the annular groove of this utility model;

[0025] Figure 5 This is a cross-sectional view of the recessed portion and the protruding portion of this utility model;

[0026] Figure 6 This is a schematic diagram showing the structure of the placement groove and placement block of this utility model in cooperation.

[0027] Figure 7 This is a schematic diagram of the movement trajectory of the first movable shell of this utility model from the annular groove to the straight groove;

[0028] Figure 8 This is a schematic diagram of the overall structure in Embodiment 1 of this utility model.

[0029] The attached diagram shows the markings and corresponding component names:

[0030] 1-Casing; 2-First sealing ring; 3-Gland; 4-Second sealing ring; 5-Annular groove; 6-Straight groove; 7-First moving shell; 8-Second moving shell; 9-Recess; 10-Protrusion; 11-Drill pipe; 12-First shell; 13-Limiting block; 14-Placement groove; 15-Placement block; 16-Second shell. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0032] Example 1:

[0033] like Figure 8 As shown, a borehole device for backfilling drilling mud includes an outer shell, a casing 1, a sealing ring, and a pressure cap 3. The outer shell includes a first housing 12 and a second housing 16. The end of the second housing 16 is rotatably mounted on the first housing 12. A sealing ring is provided on the inner peripheral wall of the second housing 16. The first housing 12 is connected to the casing 1. The pressure cap 3 is located inside the second housing 16 and is in contact with the sealing ring.

[0034] It should be noted that the first housing 12 and the sleeve 1 are connected by bolts. Fixing the first housing 12 prevents the first housing 12 and the second housing 16 from rotating together. The second housing 16 is rotatable, so that when the drill rod 11 drives the sealing ring to rotate, it will not affect the external fixing structure. During maintenance, only the replacement of rotating parts needs to be addressed, without disassembling the entire device.

[0035] The specific working principle of this embodiment 1 is as follows:

[0036] The first housing 12 and the sleeve 1 are fixedly connected. The second housing 16 is rotatably mounted on the first housing 12. The drill rod 11 passes through the second housing 16, the first housing 12, and the sleeve 1 in sequence. The sealing ring is in contact with the drill rod 11. The pressure cap 3 is located inside the second housing 16 and is in contact with the sealing ring, used to firmly fix the sealing ring in the second housing 16 to prevent displacement or loosening during operation. When the drill rod 11 rotates, it drives the second housing 16 to rotate on the first housing 12 through the sealing ring. The sealing ring and the drill rod 11 are relatively stationary. The wear on the sealing ring is reduced when the drill rod 11 rotates, thus protecting the sealing ring and extending its service life. This design solves the technical problem of severe friction between the drill rod 11 and the sealing ring when the drill rod 11 is rotating and the sealing ring is usually fixed.

[0037] Example 2

[0038] Based on Example 1, there is another implementation method:

[0039] It should be noted that the first housing 12 has an annular groove 5, and the second housing 16 is rotatably disposed in the annular groove 5 by a slider. The first housing 12 also has two straight grooves 6 that communicate with the annular groove 5. The second housing 16 includes a first movable housing 7 and a second movable housing 8. The first movable housing 7 is provided with a first sealing ring 2, and the second movable housing 8 is provided with a second sealing ring 4. The two movable housings are in contact as a complete circle.

[0040] It should be noted that a locking part is provided on the side wall where the two movable shells come into contact.

[0041] It should be noted that the locking part includes a placement groove 14 on the side wall of the first movable housing 7 facing the second movable housing 8, and a placement block 15 on the side wall of the second movable housing 8 facing the first movable housing 7, which mates with the placement groove 14. The engagement of the placement block 15 with the groove forms a rigid limit, which can resist the tendency of the first movable housing 7 and the second movable housing 8 to separate due to internal fluid pressure or external vibration, and prevent leakage due to accidental detachment of the sealing structure. Figure 6 As shown.

[0042] It should be noted that a limit block 13 is provided at the end of the straight groove 6.

[0043] The specific working principle of this embodiment 2 is as follows:

[0044] like Figures 1 to 3 As shown, Embodiment 2 is another implementation method for separating the second housing 16. Since the drill rod 11 passes sequentially through the second housing 16, the first housing 12, and the sleeve 1, when the drill rod 11 is first inserted or replaced, it contacts the sealing ring, causing some wear to the sealing ring during the penetration process. To avoid wear on the sealing ring, this application provides an annular groove 5 on the first housing 12. The annular groove 5 allows the second housing 16 to rotate on the first housing 12. Furthermore, symmetrical straight grooves 6 that cooperate with the annular groove 5 are provided on both sides of the first housing 12. Figure 4 and Figure 7 As shown, for reference only. Figure 7 The dotted line portion represents the first housing 12, and the solid line portion represents the first movable housing 7.

[0045] As mentioned above, the second housing 16 includes a first movable housing 7 and a second movable housing 8, and the two movable housings contact each other as a complete circle. The two movable housings move in two ways: relatively moving away and relatively moving closer, both of which are achieved through the linear groove 6. This means that the first housing 12 and the second housing 16 have two states:

[0046] The first state is the closed state: at this time, the first moving shell 7 and the second moving shell 8 are both located in the annular groove 5 and remain in a fixed position, forming a cylindrical inner cavity to accommodate the drill rod 11.

[0047] The second state is the open state: When the drill rod 11 needs to be inserted for the first time or replaced, the operator can rotate the first movable housing 7 and the second movable housing 8 into the corresponding straight grooves 6 respectively. For accurate positioning, a mark can be drawn on the straight groove 6 of the first housing 12, and a mark can be drawn on the first movable housing 7 and the second movable housing 8 to indicate the position of the slider. When the mark on the slider coincides with the mark on the straight groove 6, it indicates that the sliders of the two movable housings have accurately entered the straight grooves 6. It should also be noted that after the first movable housing 7 and the second movable housing 8 are separated, the operator can adjust the position of the pressure cap 3 or leave the pressure cap 3 still. Since the sealing ring is flexible, it can still fix the two sealing rings.

[0048] At this point, the operator can pull the two sliders outward along the straight groove 6 until the sliders contact the mechanical limit block 13 at the end of the straight groove 6. At this point, they cannot be pulled further. During this process, the two previously closed movable shells separate, creating sufficient operating space inside the shells. After the drill rod 11 is installed in place, the operator pushes the sliders in the opposite direction, causing the movable shells to slide back along the straight groove 6 into the annular groove 5. When the sliders are fully inside the annular groove 5, the two movable shells close again, and the sealing rings installed on their inner walls form a complete annular sealing structure, tightly wrapping the outer wall of the drill rod 11.

[0049] This application achieves the sequential separation of drill rod 11 installation and sealing ring operation through a detachable movable shell structure. Specifically, during the drill rod 11 penetration process, the sealing ring is in the open state, completely avoiding relative movement with the drill rod 11; only after the drill rod 11 is positioned does the sealing ring achieve its sealing function through the closing of the two movable shells. This completely eliminates frictional damage to the sealing ring during the drill rod 11 insertion process, significantly extending the service life of the sealing element.

[0050] Example 3

[0051] Based on Example 2, there is another implementation method:

[0052] It should be noted that, as Figure 5As shown, the first sealing ring 2 has a recessed portion 9, and the second sealing ring 4 has a protruding portion 10, and the recessed portion 9 and the protruding portion 10 cooperate with each other.

[0053] It should be noted that the mating surfaces of the protrusion 10 and the recess 9 are serrated or wavy. Compared to planar contact, the serrated or wavy structure increases the actual contact area and improves sealing reliability.

[0054] The specific working principle of Example 3:

[0055] By matching the first movable housing 7 and the second movable housing 8, the sealing ring is correspondingly divided into two semi-circular parts. Specifically, a recess 9 is machined into the first sealing ring 2, and a protrusion 10 is provided at the corresponding position on the second sealing ring 4. It should be noted that both the recess 9 and the protrusion 10 are integrally molded using the same elastic sealing material as the sealing ring body. In the initial assembly state of the equipment, the protrusion 10 and the recess 9 form a tight embedded fit, such as... Figure 5 As shown, when the first movable shell 7 and the second movable shell 8 undergo relative displacement, the recessed portion 9 and the protruding portion 10 separate; and when the two shells reclose, the protruding portion 10 will reset under the movement of the shells and re-embed into the recessed portion 9. This effectively solves the technical problem of potential leakage at the joint surface of traditional split-type sealing rings.

[0056] Example 4

[0057] Based on Example 2, there is another implementation method:

[0058] It should be noted that pull blocks are also provided on the first movable shell 7 and the second movable shell 8. This allows the operator to apply directional pulling force to the first movable shell 7 and the second movable shell 8, avoiding uneven force distribution or damage to the shells caused by manual operation.

[0059] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A borehole device for reinjecting drilling mud into a borehole, comprising a housing, a casing (1), a sealing ring, and a gland (3), characterized in that, The outer shell includes a first shell (12) and a second shell (16). The end of the second shell (16) is rotatably mounted on the first shell (12). A sealing ring is provided on the inner peripheral wall of the second shell (16). The first shell (12) is connected to the sleeve (1). The pressure cap (3) is located inside the second shell (16) and is in contact with the sealing ring.

2. The borehole opening device for reinjecting drilling mud according to claim 1, characterized in that, The first housing (12) has an annular groove (5) and the second housing (16) is rotated and disposed in the annular groove (5) by a slider. The first housing (12) also has a straight groove (6) communicating with the annular groove (5). The second housing (16) includes a first movable housing (7) and a second movable housing (8). The first movable housing (7) is provided with a first sealing ring (2) and the second movable housing (8) is provided with a second sealing ring (4). The two movable housings are in contact as a complete circle.

3. The borehole opening device for reinjecting drilling mud according to claim 2, characterized in that, A locking part is provided on the side wall where the two movable shells are in contact.

4. The borehole opening device for reinjecting drilling mud according to claim 2, characterized in that, The first sealing ring (2) has a recess (9) inside, and the second sealing ring (4) has a protrusion (10) inside, and the recess (9) and the protrusion (10) cooperate with each other.

5. The borehole opening device for reinjecting drilling mud according to claim 3, characterized in that, The locking part includes a placement groove (14) provided on the side wall of the first movable shell (7) facing the second movable shell (8), and a placement block (15) that cooperates with the placement groove (14) provided on the side wall of the second movable shell (8) facing the first movable shell (7).

6. The borehole opening device for reinjecting drilling mud according to claim 4, characterized in that, The mating surfaces of the protrusion (10) and the recess (9) are serrated or wavy.

7. The borehole opening device for reinjecting drilling mud according to claim 1, characterized in that, The sealing ring is made of fluororubber.

8. The borehole opening device for reinjecting drilling mud according to claim 2, characterized in that, The end of the straight groove (6) is provided with a limiting block (13).

9. The borehole opening device for reinjecting drilling mud according to claim 1, characterized in that, The first housing (12) and the sleeve (1) are connected by bolts.

10. A borehole re-injection device for drilling mud according to claim 2, characterized in that, Pull blocks are also provided on the first movable shell (7) and the second movable shell (8).

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