In-situ injection drill bit for groundwater remediation

Abstract

The utility model discloses an in-situ injection drill bit for groundwater remediation. The in-situ injection drill bit comprises a front drill bit, a telescopic sprayer assembly, a sliding sleeve and an upper connector. The upper joint is detachably connected with the hollow drill rod through a thread structure; through holes are formed in the sliding sleeve and the upper joint; the telescopic nozzle assembly comprises a sliding rod; a through hole is formed in the sliding rod, a plurality of axial protruding blocks are arranged on the upper portion of the sliding rod, and a plurality of spraying holes are formed in the side wall of the middle-lower portion of the sliding rod. A groove matched with the protruding block is formed in the inner wall of the through hole in the upper portion of the sliding sleeve. The through holes in the hollow drill rod, the sliding sleeve, the upper connector and the sliding rod are communicated with one another. The jet function is integrated in the drill bit, the jet head does not need to be replaced during operation, and the drill bit is particularly suitable for repairing occasions with small acting depth. According to the specific structure, switching of the drill bit and the spraying head is achieved through high-pressure pushing of spraying liquid, in the drilling operation process, the spraying head can be effectively sealed through the elastic blocking piece, and backward flowing is avoided.

Description

Technical Field

[0001] This utility model relates to the field of groundwater remediation technology, specifically to an in-situ injection drill bit for groundwater remediation. Background Technology

[0002] In-situ groundwater injection remediation is a technique that directly remediates underground aquifers within contaminated sites, eliminating the need to extract groundwater for surface treatment. This technique involves injecting remediation agents (such as oxidants, reducing agents, and microorganisms) into the aquifer, causing a chemical reaction or biodegradation of the pollutants to purify the groundwater. Common techniques include: High-pressure injection (HPI): This technique uses a high-pressure nozzle to inject remediation agents into the aquifer, while simultaneously raising the injection pipe to ensure thorough mixing of the agents with the contaminated soil and groundwater. This technique is suitable for various soil types, features high injection pressure, and a large diffusion radius. Injection well technology: This involves establishing injection wells in the contaminated area and injecting chemical agents into them. The agents diffuse laterally and vertically, covering the contaminated area and reacting with the pollutants. High-pressure injection is increasingly used due to its versatility and rapid construction. In this technique, a borehole is drilled to a predetermined depth, and while the nozzle sprays the agent, the injection pipe is raised, and the high-pressure liquid flow cuts and mixes the soil, ensuring thorough mixing of the agent and contaminated soil, thereby achieving the oxidative decomposition of the pollutants. When using this method, you usually need to drill to the preset depth with a conventional drill bit, and then replace the nozzle to perform injection repair, which is a relatively complicated operation. Summary of the Invention

[0003] The purpose of this invention is to provide an in-situ injection drill bit for groundwater remediation, so as to solve the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides an in-situ injection drill bit for groundwater remediation, comprising a front drill bit, a telescopic nozzle assembly, a sliding sleeve, and an upper connector; the front drill bit and the telescopic nozzle assembly, and the sliding sleeve and the upper connector are detachably connected by a threaded structure; the upper connector is detachably connected to a hollow drill rod by a threaded structure; the sliding sleeve and the upper connector are provided with through holes inside; the telescopic nozzle assembly includes a sliding rod; the sliding rod is provided with a through hole inside, and has several axial protrusions on its upper part and several injection holes on its middle and lower sidewalls; the inner wall of the through hole in the upper part of the sliding sleeve is provided with a groove that mates with the protrusions; the hollow drill rod, the sliding sleeve, the upper connector, and the through holes inside the sliding rod are interconnected.

[0005] Furthermore, the telescopic nozzle assembly also includes a bottom plug, a pressure block, and a spring; the bottom plug is set in the bottom through hole of the sliding rod through a threaded structure, and the top of the bottom plug is connected to the pressure block through a spring; the pressure block is set inside the through hole of the sliding rod, and its outer diameter is equal to the inner diameter of the through hole.

[0006] Furthermore, the height of the groove in the axial direction is greater than the height of the protrusion.

[0007] Furthermore, the front drill bit includes a connecting rod and a drill bit. The connecting rod is located at the center of the lower part of the drill bit and has a threaded hole, which engages with the thread on the outer side of the bottom of the sliding rod to achieve a detachable connection.

[0008] Furthermore, a removable filter screen is provided inside the through hole of the upper connector.

[0009] Furthermore, a mud scraping structure is provided on the outer side of the lower through hole area of ​​the sliding sleeve, and a mud discharge chamfer is provided at the upper connection of the front drill bit.

[0010] Furthermore, the sludge scraping structure is a raised ring located outside the lower through hole of the sliding sleeve, and the upper outer side of the raised ring is chamfered.

[0011] Furthermore, the sludge scraping structure is connected to the lower part of the sliding sleeve via a threaded structure, and a threaded hole that mates with it is provided at the through hole in the lower part of the sliding sleeve. A rubber sleeve is provided inside the sludge scraping structure.

[0012] This invention proposes an in-situ injection drill bit for groundwater remediation, integrating a jetting function within the drill bit. This eliminates the need to change the jetting head during operation, making it particularly suitable for remediation applications requiring shallow depths. Structurally, the high-pressure jetting fluid drives the switching between the drill bit and the jetting head. During drilling, an elastic plug effectively seals the jetting head, preventing backflow. Attached Figure Description

[0013] Figure 1 This is an exploded view of the overall scheme of one embodiment of this utility model.

[0014] Figure 2 This is a cross-sectional schematic diagram of the connection area of ​​the sliding rod and sliding sleeve according to an embodiment of this utility model.

[0015] Figure 3 This is a partially enlarged cross-sectional view of the bottom of a telescopic nozzle assembly according to an embodiment of this utility model.

[0016] Figure 4 This is a partially enlarged view of the mud scraping structure of one embodiment of this utility model.

[0017] Figure 5 This is a partial cross-sectional schematic diagram of the mud scraping structure according to an embodiment of this utility model. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] As attached Figure 1-5 As shown, the in-situ injection drill bit for groundwater remediation involved in this utility model includes a front drill bit 1, a telescopic nozzle assembly 2, a sliding sleeve 3, and an upper connector 4.

[0020] The front drill bit 1 and the telescopic nozzle assembly 2 are detachably connected by a threaded structure, and the sliding sleeve 3 and the upper connector 4 are detachably connected by a threaded structure. The upper connector 4 is detachably connected to the hollow drill rod by a threaded structure.

[0021] The sliding sleeve 3 and the upper connector 4 are provided with through holes.

[0022] As attached Figure 1 , 2 As shown in Figure 3, the telescopic nozzle assembly 2 includes a sliding rod 21, a bottom plug 22, a pressure block 23, and a spring 24. The sliding rod 21 has a through hole inside, several axial protrusions 211 on its upper part, and several spray holes 212 on its lower side wall. The bottom plug 22 is threaded into the bottom through hole of the sliding rod 21, and its top is connected to the pressure block 23 via the spring 24. The pressure block 23 is located inside the through hole of the sliding rod 21, and its outer diameter is equal to the inner diameter of the through hole. Furthermore, several sealing rings can be provided on the outside of the pressure block 23, a structure that is existing technology in the field of pistons. When the spring 24 is not compressed, the pressure block 23 internally blocks the spray holes 212.

[0023] A groove 31 that mates with the protrusion 211 is provided on the inner wall of the through hole at the upper part of the sliding sleeve 3, and a sliding connection is achieved through the cooperation of the protrusion 211 and the groove 31.

[0024] The sliding rod 21 extends into the through hole inside the sliding sleeve 3, and the protrusion 211 cooperates with the groove 31. In the initial state, the spray hole 212 is blocked by the sliding sleeve 3.

[0025] The groove 31 is higher in the axial direction than the protrusion 211, so that when the protrusion 211 is at its top limit position, there is a certain distance between the top of the protrusion 211 and the top of the groove 31. The existence of this gap helps the high-pressure liquid flow to press the protrusion 211, causing it to push the sliding rod 21 to slide downward.

[0026] The hollow drill rod, sliding sleeve 3, upper connector 4, and sliding rod 21 have interconnected internal through holes.

[0027] The front drill bit 1 includes a connecting rod 11 and a drill bit 12. The connecting rod 11 is located at the center of the lower part of the drill bit and has a threaded hole, which engages with the threaded outer side of the bottom of the sliding rod 21 to achieve a detachable connection.

[0028] In use, the in-situ injection drill bit is connected to the drill rod, and a hole is drilled downwards. When the preset depth is reached, the drill rod is pulled upwards a certain distance. The upper part of the hollow drill rod is connected to the high-pressure water supply device through a rotating structure. Under the action of high-pressure water, the sliding rod 21 is pushed downwards, causing the area of ​​the injection hole 212 to leak out from the lower part of the sliding sleeve 3. Then, under the action of water pressure, the spring 24 is compressed, which drives the pressure block 23 to move downwards, causing the injection hole 212 to open and water to be discharged. Under the action of the drill bit rotation, high-pressure rotating water spray is achieved, and a good stirring effect is initiated.

[0029] Furthermore, to prevent impurities such as soil from entering the drill rod and thus the interior of the in-situ injection drill bit components during the drill rod connection process, a removable filter screen 41 is provided inside the through hole of the upper connector 4.

[0030] During use, the drill bit may be lifted as needed, and the sliding rod 21 may slide down under its own weight. During this process, mud and sand may adhere to the outer wall of the sliding rod 21. In order to reduce the wear that may be caused during subsequent drilling, a mud scraping structure 32 is provided on the outer side of the through hole area at the lower part of the sliding sleeve 3, which can scrape off the mud when the sliding sleeve 3 moves downward. At the same time, a mud discharge chamfer 1 is provided at the upper connection of the front drill bit 1 to avoid excessive mud accumulation between the sliding sleeve 3 and the front drill bit 1.

[0031] As attached Figure 4 As shown, in one embodiment, the sludge scraping structure 32 is a raised ring disposed on the outside of the lower through hole of the sliding sleeve 3, and the upper outer side of the raised ring is provided with a chamfer.

[0032] Furthermore, as shown in the attached document. Figure 5 As shown, in another embodiment, to reduce the inconvenience of processing, the scraping structure 32 is a separate structure, connected to the lower through hole of the sliding sleeve 3 via a threaded structure. Correspondingly, a threaded hole is provided at the lower through hole of the sliding sleeve 3 to mate with it. The lower part of the scraping structure 32 has a connecting portion, and the outer top surface has a chamfer for mud discharge. Furthermore, a rubber sleeve 321 is provided inside the scraping structure 32 for contacting the outer wall of the sliding rod 21, reducing wear between metal parts.

[0033] It should be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. An in-situ injection drill bit for groundwater remediation, characterized by, The utility model relates to a front drill bit, telescopic spray head assembly, sliding sleeve, upper joint, between the front drill bit, telescopic spray head assembly, between the sliding sleeve, upper joint passes through the detachable connection of screw structure, the upper joint passes through the detachable connection of screw structure with hollow drill rod, the inside of sliding sleeve, upper joint is provided with through -hole, telescopic spray head assembly includes sliding rod, the inside of sliding rod is provided with through -hole, and the upper portion is provided with a plurality of axial protruding blocks, and the middle lower portion lateral wall is provided with a plurality of injection holes, recess is provided on the inner wall of the upper portion through -hole of sliding sleeve with the protruding block cooperation, the inside through -hole of hollow drill rod, sliding sleeve, upper joint, sliding rod is interconnected.

2. The in-situ injection drill bit for groundwater remediation according to claim 1, wherein The telescopic spray head assembly further includes a bottom plug, a pressing block, and a spring. The bottom plug is arranged in the bottom through-hole of the sliding rod through a threaded structure. The top of the bottom plug is connected to the pressing block through a spring. The pressing block is arranged in the inner through-hole of the sliding rod, and the outer diameter of the pressing block is equal to the inner diameter of the through-hole.

3. The drill bit for in-situ injection for groundwater remediation according to claim 1, wherein The height of the recess in the axial direction is greater than the height of the protruding block.

4. The drill bit for in-situ injection for groundwater remediation according to claim 1, wherein The front drill bit includes a connecting rod and a drill bit. The connecting rod is arranged at the lower center of the drill bit. The connecting rod is provided with a threaded hole, which is matched with the threads on the outer side of the bottom of the sliding rod to realize detachable connection.

5. The drill bit for in-situ injection for groundwater remediation according to claim 1, wherein A detachable filter screen is arranged in the inner through-hole of the upper joint.

6. The in-situ injection drill bit of claim 1, wherein, A mud scraping structure is arranged outside the lower through-hole area of the sliding sleeve. A mud outlet chamfer is arranged at the upper connection of the front drill bit.

7. The in-situ injection drill bit of claim 6, wherein, The mud scraping structure is a protruding ring arranged outside the lower through-hole of the sliding sleeve. The outer side of the upper part of the protruding ring is provided with a chamfer.

8. The in-situ injection drill bit of claim 6, wherein, The mud scraping structure is connected to the lower part of the sliding sleeve through a threaded structure. A threaded hole matched with the threaded structure is arranged at the lower through-hole of the sliding sleeve. A rubber sleeve is arranged in the inner part of the mud scraping structure.

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