Positioning and plugging device for drilling local poor geological treatment and use method thereof

Abstract

This invention discloses a positioning and sealing device and its method for treating localized geological defects in boreholes. The device includes a hollow threaded joint, a connecting rod connected to the threaded joint at one end, and a tray connected to the other end of the connecting rod. In use, the threaded joint is connected to the drill rod, and the positioning and sealing device is delivered to the area of ​​the geological defect in the borehole via the drill rod. Sealing material is then injected into the area of ​​the geological defect through the drill rod and the hollow threaded joint. The sealing material falls and settles on the tray, thus sealing the area of ​​the geological defect in the borehole. This invention uses a positioning and sealing device to inject sealing material into the localized geological defect in the borehole, thereby reinforcing the borehole wall at the localized geological defect. This avoids sealing work below the geological defect area during the sealing process, simplifying the sealing workload, shortening the construction period, and saving materials.

Description

Technical Field

[0001] This invention belongs to the technical field of geological exploration, specifically relating to a positioning and sealing device and its usage method for treating localized adverse geological conditions in boreholes. Background Technology

[0002] Engineering geological exploration is generally conducted based on engineering geological mapping. It can directly penetrate underground rock strata to obtain the necessary engineering geological data, making it a reliable method for exploring deep geological conditions. The main tasks of engineering geological exploration include: determining the lithology and geological structure of the construction site, determining hydrogeological conditions, and extracting rock, soil, and water samples. Engineering geological drilling is an important method for obtaining accurate geological data below the surface, and its tasks also include collecting undisturbed rock and soil samples and conducting on-site mechanical tests through the boreholes. When conducting on-site mechanical tests, it is usually necessary to place testing equipment, such as geostress testing equipment and acoustic testing equipment, inside the borehole. The presence of unfavorable geological conditions often hinders on-site tests; therefore, to ensure the smooth progress of the tests, it is often necessary to reinforce the borehole wall. The traditional method of borehole wall reinforcement involves sealing the entire borehole and then re-sweeping it. This method alters the entire borehole wall structure, affecting the results of tests such as geostress, high-pressure water pressure, and geophysical exploration. Furthermore, it treats many areas that do not require treatment, delaying the project and wasting materials. Summary of the Invention

[0003] One objective of this invention is to address the shortcomings of existing technologies by providing a positioning and sealing device for treating localized unfavorable geological conditions in boreholes. This device can target and seal unfavorable geological areas, simplifying the sealing workload, shortening the construction period, and saving materials.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A positioning and sealing device for treating localized poor geological conditions in boreholes includes a hollow thread, a connecting rod connected to the thread at one end, and a tray connected to the other end of the connecting rod.

[0006] In use, the thread is connected to the drill rod, and the positioning and sealing device is sent to the unfavorable geological area in the borehole through the drill rod. Sealing material is injected into the unfavorable geological area in the borehole through the drill rod and the hollow thread. The sealing material falls and stays on the tray to form a seal in the unfavorable geological area in the borehole.

[0007] Furthermore, the diameter of the tray is 3-5 mm smaller than the diameter of the drill hole.

[0008] Furthermore, the threads and the tray are connected by multiple connecting rods.

[0009] Furthermore, the number of connecting rods is adjusted according to the extent of the adverse geological conditions; the larger the area, the greater the number.

[0010] Furthermore, the number of connecting rods is 2-4.

[0011] Furthermore, the connecting rod is made of plastic.

[0012] Furthermore, the length of the connecting rod is greater than the length of the unfavorable geological area in the drilling direction.

[0013] Another object of the present invention is to provide a method of using the above-described positioning and sealing device for treating localized geological defects in boreholes, comprising the following steps:

[0014] S1: Install the threaded part onto the bottom of the drill pipe;

[0015] S2: The positioning and sealing device is sent to the unfavorable geological area inside the borehole via the drill pipe;

[0016] S3: The sealing material is delivered into the borehole through the hollow drill rod and threads. The sealing material falls and stays on the tray, thus forming a seal in the unfavorable geological area of ​​the borehole.

[0017] S4: After the grouting in the unfavorable geological area is completed and solidified, pull the positioning and sealing device upwards using the drilling rig until the connecting rod breaks and separates from the thread, then pull out the drill rod;

[0018] S5: Replace the drill bit at the end of the drill pipe and clear the borehole at the sealing position in the unfavorable geological area to complete the treatment of the unfavorable geological area of ​​the borehole.

[0019] Furthermore, during the sealing process, first pour in 3L of aggregate material with a maximum particle size greater than 4mm, and continue sealing after it has gained a certain strength.

[0020] Furthermore, in step S2, when the drill pipe lowers the positioning and sealing device into place, the tray is located below the unfavorable geological area.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention uses a positioning and sealing device to inject sealing material into localized unfavorable geological areas in the borehole, thereby reinforcing the borehole wall at these localized unfavorable geological areas. This avoids the need for sealing work on parts below the unfavorable geological area during the sealing process. It solves the problems caused by the prior art's sealing and reinforcement of the entire borehole, such as changes in the borehole wall structure, ground stress, and high-pressure water. In addition, the prior art also treats most of the areas that do not need treatment, which delays the construction period and wastes materials. The present invention simplifies the sealing work, shortens the construction period, and saves materials by using this positioning and sealing device for localized sealing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the positioning and sealing device according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of a borehole in an area with poor geological conditions, as described in an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram illustrating the placement of the positioning and sealing device in an area with unfavorable geological conditions, according to an embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram showing the unfavorable geological area after being sealed off in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram showing the state of the connecting rod after it has been broken according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram showing the state of the borehole after it has been reopened following the sealing process, according to an embodiment of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0030] The present invention will be further described below with reference to specific embodiments, but these are not intended to limit the scope of the invention.

[0031] This invention discloses a positioning and sealing device for treating localized geological defects in boreholes, such as... Figure 1 As shown, the device includes a hollow threaded joint 1, a connecting rod 2 connected to the threaded joint 1 at one end, and a tray 3 connected to the other end of the connecting rod 2. In use, the threaded joint 1 is connected to the drill rod 4, and the positioning and sealing device is delivered to the unfavorable geological area 5 in the borehole 4 via the drill rod 4. Sealing material 6 is injected into the unfavorable geological area 5 in the borehole 4 through the drill rod and the hollow threaded joint 1. The sealing material 6 falls and settles on the tray 3 to seal the unfavorable geological area 5 in the borehole. To facilitate the lowering of the positioning and sealing device without affecting the sealing of the borehole 4, the diameter of the tray 3 is slightly smaller than the diameter of the borehole 4. In this embodiment, the diameter of the tray 3 is 3-5 mm smaller than the diameter of the borehole 4.

[0032] The number of connecting rods 2 is adjusted according to the extent of the adverse geological area 5. The larger the area, the greater the number. Ideally, multiple connecting rods 2 should not be broken by the sealing material 6 after sealing. Specifically, the number of connecting rods 2 can be 2 to 4, and the material should preferably be plastic. If the strength of 4 plastic connecting rods is insufficient, steel connecting rods should be used instead, and the number of connecting rods should be reduced. At the same time, in order to improve the sealing effect and ensure that the entire adverse geological area 5 is sealed, the length of the connecting rods 2 must be greater than the length of the local adverse geological area 5 in the direction of borehole 4.

[0033] This invention also provides a method for using the positioning and sealing device for treating localized geological defects in boreholes, comprising the following steps:

[0034] S1: Install thread 1 to the bottom of the drill pipe by means of threading, etc.;

[0035] S2: As Figure 2 and Figure 3 As shown, the positioning and sealing device is sent to the unfavorable geological area 5 in the borehole through the drill rod. In this embodiment, when the borehole diameter is 75mm, the diameter of the tray 3 is 71mm. After being lowered into place, the tray is located below the unfavorable geological area 5. In this example, the unfavorable geological area 5 has a size of 1m along the borehole axis. In order to ensure the sealing effect, the number of connecting rods 2 is set to 3, the material is plastic, and the length is 1.2m.

[0036] S3: The sealing material 6 is conveyed to the unfavorable geological area 5 in the borehole through the hollow drill rod and thread 1. The sealing material 6 falls and rests on the tray 3, thus forming a seal in the unfavorable geological area 5 in the borehole 4. Figure 4 During the sealing process, 3L of aggregate material with a maximum particle size greater than 4mm is first poured in, and the sealing process continues after the aggregate has gained sufficient strength.

[0037] S4: After the grouting in the unfavorable geological area 5 is completed and solidified, pull the positioning and sealing device upwards using the drilling rig until the connecting rod 2 breaks and separates from the thread 1. Then, remove the drill rod. (See attached image) Figure 5 ;

[0038] S5: See Figure 6 The drill string was replaced at the bottom of the drill pipe, and the borehole 4 was cleared at the sealing position in the unfavorable geological area, thereby completing the treatment of the unfavorable geological conditions in borehole 4.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the content of this specification should be included within the protection scope of the present invention.

Claims

1. A positioning and plugging device for drilling local poor geological treatment, characterized in that, It includes a hollow thread, a connecting rod connected to the thread at one end, and a tray connected to the other end of the connecting rod; In use, the thread is connected to the drill rod, and the positioning and sealing device is sent to the area of ​​poor geological conditions in the borehole through the drill rod. The sealing material is injected into the area of ​​poor geological conditions in the borehole through the drill rod and the hollow thread. The sealing material falls and stays on the tray to form a seal in the area of ​​poor geological conditions in the borehole. The connecting rod is made of plastic. The length of the connecting rod is greater than the length of the unfavorable geological area in the drilling direction.

2. The positioning and plugging device for drilling local poor geological treatment according to claim 1, characterized in that, The diameter of the tray is 3-5mm smaller than the diameter of the drill hole.

3. The positioning and plugging device for drilling local poor geological treatment according to claim 1, characterized in that, The threads and the tray are connected by multiple connecting rods.

4. The positioning and sealing device for treating localized geological defects in boreholes according to claim 3, characterized in that, The number of connecting rods is adjusted according to the extent of the adverse geological conditions; the larger the area, the more rods are needed.

5. The positioning and sealing device for treating localized geological defects in boreholes according to claim 4, characterized in that, The number of connecting rods is 2-4.

6. A method of using a positioning and sealing device for treating localized geological defects in boreholes according to any one of claims 1-5, characterized in that, Includes the following steps: S1: Install the threaded part onto the bottom of the drill pipe; S2: The positioning and sealing device is sent to the unfavorable geological area inside the borehole via the drill pipe; S3: The sealing material is delivered into the borehole through the hollow drill rod and threads. The sealing material falls and stays on the tray, thus forming a seal in the unfavorable geological area of ​​the borehole. S4: After the grouting in the unfavorable geological area is completed and solidified, pull the positioning and sealing device upwards using the drilling rig until the connecting rod breaks and separates from the thread, then pull out the drill rod; S5: Replace the drill bit at the bottom of the drill pipe and clear the borehole at the sealing position in the unfavorable geological area to complete the treatment of unfavorable geological conditions in the borehole.

7. The method of using the positioning and sealing device for treating localized poor geological conditions in boreholes according to claim 6, characterized in that, During the sealing process, first pour in 3L of aggregate material with a maximum particle size greater than 4mm, and continue sealing after it has gained sufficient strength.

8. The method of using the positioning and sealing device for treating localized geological defects in boreholes according to claim 6, characterized in that, In step S2, when the drill pipe lowers the positioning and sealing device into place, the tray is located below the unfavorable geological area.

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