A hydrogeological drilling layered water-stopping device

Abstract

The utility model relates to the technical field of hydrogeology borehole layered water stop device, disclose a layered water stop device for hydrogeological drilling, including the sleeve, the inside of sleeve is provided with layered water stop subassembly, through the layered water stop subassembly that sets up, the inflatable rubber sleeve is located between two groups layered water taking hole, after inflation, closely fit borehole wall and sleeve outer wall, form reliable annular sealing band, effectively block interlayer water flow intercommunication, lay the seal foundation for layered water taking, cooperate two groups independent pipeline with hydraulic valve, can accurate control upper and lower water taking hole on-off, collect different depth groundwater as needed, completely avoid interlayer water mixing, guarantee water sample real and reliable, satisfy the layered water quality accurate reconnaissance demand, simultaneously, the filter screen cylinder is connected in the pipeline outside through the outer thread and the internal thread, can high -efficiently filter silt impurity, and the thread structure is convenient for disassembly and cleaning or replacement.

Description

Technical Field

[0001] This utility model relates to the technical field of layered water-stopping devices for hydrogeological boreholes, and particularly to a layered water-stopping device for hydrogeological boreholes. Background Technology

[0002] In hydrogeological exploration, pumping tests are an important means of obtaining hydrogeological parameters and studying the relationship between groundwater recharge, runoff, and discharge. They can provide basic parameters for water-bearing classification and groundwater resource calculation. With the continuous improvement of the accuracy of hydrogeological exploration in China, a single hydrogeological borehole often involves two aquifers: unconfined and confined aquifers, requiring stratified pumping and stratified observation.

[0003] The applicant discovered through a search that a Chinese patent, "A Layered Water-Stopping Device for Hydrogeological Drilling," with publication number CN222596046U, mainly comprises a first layered cylinder, a perforated plate, a first damping reset rod, an adjusting sleeve, an abutment strip, a second layered cylinder, and a water-stopping cylinder. Based on current requirements for layered water intake and water-stopping, the water intake device simply needs to be brought into contact with the adjusting sleeve, and the adjusting sleeve is pressed down to insert the abutment strip into the perforated plate. This allows the first layered cylinder to rotate, bringing the side with the perforation into contact with the holes in the layered water-stopping pipe, allowing water to seep in from the outside or be injected directly from the inside to the outside, thus completing the upper-layered water intake and intake process. Then, without rotating the first layered cylinder... If so, the adjusting sleeve can be pressed down further to allow the contact strip to pass through the sluice plate and contact the connector on the lower water-stop cylinder. The connector will then drive the water-stop cylinder to retract towards the bottom of the second layered cylinder through the second damping reset rod. This will expose the water-stopping hole in the middle of the layered water-stopping pipe body, completing the water intake and injection work in the middle layer. However, this patent relies on the mechanical structure of the contact strip inserting into the sluice plate and the connector driving the water-stop cylinder to retract to achieve layering. There are many connection points between the components, and the sealing structure is complex. In the actual drilling environment, due to factors such as uneven borehole walls and groundwater pressure fluctuations, the sealing is prone to failure, resulting in water mixing between layers and affecting the authenticity and representativeness of the water sample. Therefore, we propose a layered water-stopping device for hydrogeological boreholes. Utility Model Content

[0004] The purpose of this utility model is to provide a layered water-stopping device for hydrogeological boreholes, in order to solve the problems mentioned in the background art, which rely on the mechanical structure of inserting the contact strip into the slot plate and the joint driving the water-stopping cylinder to achieve layering. There are many connection points between the components and the sealing structure is complex. In the actual drilling environment, due to factors such as uneven borehole walls and groundwater pressure fluctuations, the sealing is prone to failure, resulting in water mixing between layers and affecting the authenticity and representativeness of the water sample.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a layered water-stopping device for hydrogeological boreholes, comprising a casing, wherein a layered water-stopping assembly is provided inside the casing, the layered water-stopping assembly comprising an inflatable rubber sleeve, a pipe, a hydraulic valve, and a filter screen, wherein the inflatable rubber sleeve is connected to a sealing plug via an air pressure pipe, the inflatable rubber sleeve is disposed at the middle outer wall of the casing, and layered water intake holes are provided at both the upper and lower outer walls of the casing, wherein the inflatable rubber sleeve is located between two groups of layered water intake holes.

[0006] As a preferred embodiment, the lower end of the air pressure tube is fixedly connected to the inside of the inflatable rubber sleeve, the air pressure tube is disposed inside the sleeve, and the sealing plug is inserted into the inner wall of the upper end of the air pressure tube.

[0007] As a preferred embodiment, the pipes, hydraulic valves, and filter cylinders are each provided in two sets. The two sets of pipes are respectively fixedly installed inside the two sets of layered water intake holes, and the two sets of hydraulic valves are respectively located at the top of the two sets of pipes.

[0008] As a preferred embodiment, both sets of pipes have external threads on their outer walls, and both sets of filter cylinders have internal threads on their inner walls. The two sets of filter cylinders are respectively connected to the outside of the two sets of pipes through two sets of external threads and two sets of internal threads.

[0009] As a preferred embodiment, the top of the sleeve is provided with a sealing assembly, the sealing assembly including a top cover, the bottom of the top cover being fixedly connected to a sealing block, and the sealing block being inserted into the top inner wall of the sleeve.

[0010] As a preferred embodiment, two sets of annular sealing grooves are provided on the outer wall of the sealing block, and O-rings are provided inside the two sets of annular sealing grooves. The two sets of O-rings are in contact with the top inner wall of the sleeve.

[0011] The technical effects and advantages of this utility model are as follows:

[0012] 1. Through the set layered water-stopping components, the inflatable rubber sleeve is set between the two sets of layered water intake holes. After inflation, it can tightly fit the borehole wall and the outer wall of the casing to form a reliable annular sealing strip. It can effectively block the water flow between different hydrogeological layers from space, laying the core sealing foundation for layered water intake. On this basis, with the help of two sets of independent pipes and hydraulic valves, the opening and closing of the upper and lower layered water intake holes can be precisely controlled respectively, and groundwater at different depths can be collected as needed. It completely avoids the interference of water mixing between layers, effectively ensuring the authenticity and representativeness of the water sample, and meeting the accurate needs of layered water quality data in hydrogeological exploration. At the same time, the filter screen is installed on the outside of the pipe through the threaded connection of external and internal threads, which can efficiently filter the mud and sand impurities in the water. The threaded connection structure makes it easy for staff to disassemble the filter screen for cleaning or replacement at any time.

[0013] 2. Through the set sealing components, the top cover can directly block external debris, preventing it from entering the casing and contaminating the water sample or clogging the layered water-stopping components, providing basic protection for the internal structure. The sealing block fixed to it is inserted into the inner wall of the top of the casing, initially filling the opening gap and forming the first layer of sealing barrier, blocking the direct exchange of substances between the inside and outside of the casing. The two sets of O-rings in the annular sealing groove on the outer wall of the sealing block can fit tightly against the inner wall of the top of the casing with elasticity, which not only compensates for assembly errors and minor deformation of components, but also forms a double elastic seal, greatly reducing the risk of groundwater leakage and the entry of outside air. This ensures the long-term effectiveness of the top seal and provides a stable environment for the layered water-stopping components to accurately extract water in layers and ensure the authenticity of the water sample. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the overall unfolded structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the overall internal structure of this utility model;

[0018] Figure 5 This is one of the schematic diagrams showing the partial structure of the layered water-stopping component of this utility model;

[0019] Figure 6 This is the second schematic diagram showing the partial structure of the layered water-stopping component of this utility model.

[0020] Figure 7 This is a schematic diagram of the unfolded structure of the sealing component of this utility model.

[0021] In the diagram: 1. Sleeve; 2. Layered water-stopping assembly; 201. Layered water intake hole; 202. Inflatable rubber sleeve; 203. Air pressure pipe; 204. Sealing plug; 205. Pipe; 206. Hydraulic valve; 207. Filter screen cylinder; 208. External thread; 209. Internal thread; 3. Sealing assembly; 301. Top cover; 302. Sealing block; 303. O-ring; 304. Annular sealing groove. Detailed Implementation

[0022] 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.

[0023] Please see the appendix Figure 1 - Appendix Figure 6 A layered water-stopping device for hydrogeological drilling includes a casing 1. A layered water-stopping component 2 is installed inside the casing 1. The layered water-stopping component 2 includes an inflatable rubber sleeve 202, a pipe 205, a hydraulic valve 206, and a filter screen 207. The inflatable rubber sleeve 202 is connected to a sealing plug 204 through a pneumatic pipe 203. The inflatable rubber sleeve 202 is located on the middle outer wall of the casing 1. Layered water intake holes 201 are opened on both the upper and lower outer walls of the casing 1. The inflatable rubber sleeve 202 is located between the two sets of layered water intake holes 201. The lower end of the pneumatic pipe 203 is fixedly connected to the inside of the inflatable rubber sleeve 202. The pneumatic pipe 203 is located inside the casing 1. The sealing plug 204 is inserted into the upper inner wall of the pneumatic pipe 203.

[0024] The stratified water intake hole 201 serves as the core channel for stratified water intake. The two sets of stratified water intake holes 201 are respectively opened on the upper and lower outer walls of the casing 1, corresponding to different hydrogeological layers in the borehole. The lower stratified water intake hole 201 is used to collect water samples from the target aquifer below, and the upper stratified water intake hole 201 is used to collect water samples from the aquifer above. The inflatable rubber sleeve 202 is located between the two sets of holes to ensure that the water flow between the upper and lower layers is completely isolated.

[0025] Two sets of pipes 205, hydraulic valves 206, and filter cylinders 207 are provided. The two sets of pipes 205 are fixedly installed inside the two sets of layered water intake holes 201. The two sets of hydraulic valves 206 are respectively located at the top of the two sets of pipes 205. External threads 208 are provided on the outer wall of the two sets of pipes 205. Internal threads 209 are also provided on the inner wall of the two sets of filter cylinders 207. The two sets of filter cylinders 207 are threaded to the outside of the two sets of pipes 205 through the two sets of external threads 208 and the two sets of internal threads 209 respectively.

[0026] The lower end of the air pressure tube 203 is fixedly connected to the inside of the inflatable rubber sleeve 202, and the upper end extends to the vicinity of the top of the sleeve 1. Compressed air is injected into the inflatable rubber sleeve 202 through the air pressure tube 203 by an external inflation device such as an air pump, causing it to expand. The sealing plug 204 can seal the upper opening of the air pressure tube 203 to prevent air pressure leakage after inflation, and at the same time prevent external impurities such as mud, sand and rainwater from entering the air pressure tube 203 and blocking the channel.

[0027] Specifically, through the layered water-stopping component 2, an inflatable rubber sleeve 202 is placed between the two sets of layered water intake holes 201. After inflation, it fits tightly against the borehole wall and the outer wall of the casing 1, forming an annular sealing strip to block the water flow between different hydrogeological layers, thus laying a solid core sealing foundation for layered water intake. On this basis, two sets of independent pipes 205 cooperate with hydraulic valves 206 to precisely control the opening and closing of the upper and lower layered water intake holes 201, collecting groundwater at different depths as needed, avoiding water mixing interference between layers, ensuring the authenticity and representativeness of water samples, and meeting the precise requirements of hydrogeological exploration for layered water quality data. At the same time, the filter screen 207 is installed on the outside of the pipe 205 by means of threaded connection of external thread 208 and internal thread 209, which efficiently filters mud and sand impurities in the water. Due to the threaded connection, the staff can disassemble the filter screen 207 for cleaning or replacement at any time.

[0028] Please see the appendix Figure 1 Appendix Figure 2 and appendix Figure 7 The top of the sleeve 1 is provided with a sealing component 3, which includes a top cover 301. A sealing block 302 is fixedly connected to the bottom of the top cover 301. The sealing block 302 is inserted into the top inner wall of the sleeve 1. Two sets of annular sealing grooves 304 are provided on the outer wall of the sealing block 302. O-rings 303 are provided inside the two sets of annular sealing grooves 304. Both sets of O-rings 303 are in contact with the top inner wall of the sleeve 1.

[0029] O-ring 303 is an elastic sealing element that enhances the sealing effect. It is installed in the annular sealing groove 304 on the outer wall of sealing block 302. It uses its own elasticity to tightly fit the gap between the inner wall of the top of sleeve 1 and the outer wall of sealing block 302. Compared with the rigid fit of sealing block 302 itself, O-ring 303 can compensate for assembly errors or minor deformation of components through elastic deformation, which greatly reduces the risk of groundwater leakage from the gap and achieves double sealing enhancement.

[0030] Specifically, the sealing component 3 and the top cover 301 shield external debris from entering the casing 1 to contaminate the water sample or clog the layered water-stopping component 2, providing basic protection for the internal structure. The sealing block 302, fixed to the top cover 301, is inserted into the inner wall of the top of the casing 1 to initially fill the opening gap, forming the first layer of sealing barrier and blocking direct material exchange between the inside and outside of the casing 1. The two sets of O-rings 303 in the annular sealing groove 304 on the outer wall of the sealing block 302 fit tightly against the inner wall of the top of the casing 1 with elasticity, compensating for assembly errors and minor deformations of components, forming a double elastic seal, reducing the risk of groundwater leakage and the entry of outside air, ensuring the long-term effectiveness of the top seal, and providing a stable environment for the layered water-stopping component 2 to accurately extract water in layers and ensure the authenticity of the water sample.

[0031] The working principle of this utility model is as follows: This utility model is a layered water-stopping device for hydrogeological boreholes. First, the operator lowers the fully assembled casing 1 into the target hydrogeological borehole, ensuring a reasonable gap between the outer wall of the casing 1 and the borehole wall. The layered water sampling holes 201 on the upper and lower outer walls of the casing 1 correspond to the two different hydrogeological layers in the borehole where water samples are to be collected. The lower layered water sampling hole 201 is aligned with the target aquifer below, and the upper layered water sampling hole 201 is aligned with the aquifer above, ensuring accurate water sampling location. Next, the operator takes out an external inflation device, such as an air pump, and connects it to the upper opening of the air pressure pipe 203. Then, the inflation device is started, and compressed air is injected into the inflation rubber sleeve 202 through the air pressure pipe 203. The inflation is then observed. The pneumatic rubber sleeve 202 is inflated until it tightly adheres to the borehole wall and the outer wall of the casing 1, forming a reliable annular seal. At this point, the hydrogeological layers corresponding to the upper and lower stratified water intake holes 201 are completely isolated, blocking the interlayer water flow and completing the stratified water-stopping operation. The inflation equipment is then turned off, the connecting pipe is disconnected, and the sealing plug 204 is inserted into the upper inner wall of the pneumatic tube 203 to seal the opening of the pneumatic tube 203, preventing air pressure leakage after inflation and preventing external impurities such as mud and rainwater from entering the pneumatic tube 203 and blocking the channel. Then, after the staff confirms that the sealing effect of the pneumatic rubber sleeve 202 is stable, the hydraulic valve 206 at the top of the pipe 205 connected to the lower stratified water intake hole 201 is slowly opened. Under its own pressure, the groundwater flows through the lower stratified water intake hole. Water enters pipe 205 through hole 201 and flows through external filter screen 207. Impurities such as sediment are filtered and retained by the filter screen 207. The filtered clean water sample flows out through pipe 205 and the opened hydraulic valve 206. Workers collect water samples using a dedicated sampling container until the samples meet testing requirements. After sampling, the hydraulic valve 206 of the lower pipe 205 is closed, completing the water sampling operation for the target aquifer below. Then, while maintaining the sealed state of the inflatable rubber sleeve 202, workers slowly open the hydraulic valve 206 at the top of pipe 205, which connects to the upper layer water sampling hole 201. Groundwater from the upper aquifer enters the corresponding pipe 205 through the upper layer water sampling hole 201. Similarly, after being filtered by the filter screen 207, the water flows out through the opened hydraulic valve 206. Water flows out from valve 206, and workers use another set of special water sampling containers to collect water samples from the upper water layer. After collection, the hydraulic valve 206 of the upper pipeline 205 is closed in a timely manner to complete the water sampling operation of the upper water layer. If the filter screen cylinder 207 shows signs of blockage during the water sampling process, or after completing a single water sampling operation, workers can rotate the filter screen cylinder 207 and use the engagement of the external thread 208 and the internal thread 209 to disassemble it from the pipeline 205. The disassembled filter screen cylinder 207 is then cleaned to remove the trapped mud and impurities. If the filter screen is damaged, a new filter screen cylinder 207 is replaced in time. After cleaning or replacement, the filter screen cylinder 207 is reinstalled back onto the outside of the pipeline 205 through the threaded connection. When the entire hydrogeological exploration operation of the borehole is completed...Workers removed the sealing plug 204 from the upper end of the air pressure pipe 203, allowing the compressed air inside the inflatable rubber sleeve 202 to escape through the air pressure pipe 203. The inflatable rubber sleeve 202 returned to its contracted state. After the inflatable rubber sleeve 202 was fully contracted, the sleeve 1 and its internal layered water-stopping component 2 and sealing component 3 were removed from the drill hole as a whole.

[0032] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A layered water-stopping device for hydrogeological boreholes, comprising a casing (1), characterized in that: The sleeve (1) is provided with a layered water-stopping assembly (2). The layered water-stopping assembly (2) includes an inflatable rubber sleeve (202), a pipe (205), a hydraulic valve (206), and a filter screen (207). The inflatable rubber sleeve (202) is connected to a sealing plug (204) through an air pressure pipe (203). The inflatable rubber sleeve (202) is located on the middle outer wall of the sleeve (1). Layered water intake holes (201) are provided on both the upper and lower outer walls of the sleeve (1). The inflatable rubber sleeve (202) is located between the two layers of layered water intake holes (201).

2. The layered water-stopping device for hydrogeological boreholes according to claim 1, characterized in that: The lower end of the air pressure tube (203) is fixedly connected to the inside of the inflatable rubber sleeve (202), the air pressure tube (203) is set inside the sleeve (1), and the sealing plug (204) is inserted into the inner wall of the upper end of the air pressure tube (203).

3. A layered water-stopping device for hydrogeological boreholes according to claim 2, characterized in that: The pipe (205), hydraulic valve (206) and filter cylinder (207) are each provided in two sets. The two sets of pipes (205) are respectively fixedly installed inside the two sets of layered water intake holes (201), and the two sets of hydraulic valves (206) are respectively located on the top of the two sets of pipes (205).

4. A layered water-stopping device for hydrogeological boreholes according to claim 3, characterized in that: Both sets of pipes (205) have external threads (208) on their outer walls, and both sets of filter cylinders (207) have internal threads (209) on their inner walls. The two sets of filter cylinders (207) are respectively connected to the outside of the two sets of pipes (205) through two sets of external threads (208) and two sets of internal threads (209).

5. A layered water-stopping device for hydrogeological boreholes according to claim 4, characterized in that: The top of the sleeve (1) is provided with a sealing assembly (3), the sealing assembly (3) includes a top cover (301), the bottom of the top cover (301) is fixedly connected with a sealing block (302), and the sealing block (302) is inserted into the top inner wall of the sleeve (1).

6. A layered water-stopping device for hydrogeological boreholes according to claim 5, characterized in that: Two sets of annular sealing grooves (304) are provided on the outer wall of the sealing block (302). O-rings (303) are provided inside the two sets of annular sealing grooves (304). The two sets of O-rings (303) are in contact with the top inner wall of the sleeve (1).

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