Expansion water stop sleeve suitable for hydrological observation well to isolate shallow pore water

Abstract

The utility model relates to the technical field of water stop equipment, and aims to provide an expansion water stop sleeve suitable for isolating shallow pore water of a hydrological observation well, which comprises a plurality of water stop sleeves in threaded connection in sequence, and an expansion water stop belt is coated on the outer wall of each water stop sleeve. The tail end of the backmost water stop sleeve is in threaded connection with the front end of a second heavy pipe in the follow pipe, and the expansion water stop belt on the front water stop sleeve corresponds to the open hole section of the lower portion of the follow pipe. The expansion water stop belt is arranged on the outer wall of the water stop sleeve, the expansion water stop belt can fill a gap between the open hole section sleeve and a rock-soil layer to form a water stop structure according to the principle that the expansion water stop belt fully expands after meeting water, meanwhile, the expansion water stop belt can be effectively prevented from moving up and down due to the arrangement of the upper chuck and the lower chuck, and the water stop effect is improved. And the water stopping effect is ensured.

Description

An expansion sealing sleeve suitable for isolating shallow pore water in hydrological observation wells Technical Field

[0001] This utility model relates to the field of water-stopping equipment technology, and in particular to an expansion water-stopping sleeve suitable for isolating shallow pore water in hydrological observation wells. Background Technology

[0002] During the construction of hydrological observation wells using pneumatic down-the-hole hammers, casing drilling is employed, requiring the inner diameter of the casing shoe to match the inner diameter of the casing. The casing connection can be achieved using internal or external threads or welding, avoiding couplings which can cause inconsistencies in inner diameter. After reaching the predetermined aquitard, the self-stabilizing property of the aquitard is utilized, and the casing is discontinued; the drill string is then retrieved after drilling 2-3 meters into the open borehole. While pneumatic down-the-hole hammers offer rapid drilling speeds and have become the mainstay for hydrological monitoring well construction, they are less effective at isolating pore water in shallow, loose rock formations because the borehole diameter created by the down-the-hole hammer is larger than the diameter of the casing. Summary of the Invention

[0003] The purpose of this invention is to provide an expansion sealing sleeve suitable for isolating shallow pore water in hydrological observation wells, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An expansion sealing sleeve suitable for isolating shallow pore water in hydrological observation wells includes several sealing sleeves connected by threads in sequence. An expansion sealing strip is provided on the outer wall of the sealing sleeve. The tail end of the last sealing sleeve is threaded to the front end of the second reinforcing pipe inside the root pipe. The expansion sealing strip on the front sealing sleeve corresponds to the bare hole section at the bottom of the root pipe.

[0006] The outer wall of the water-stop sleeve is provided with an upper chuck and a lower chuck at its upper and lower ends, respectively.

[0007] The expansion waterstop is located between the upper chuck and the lower chuck.

[0008] The front end of the water-stop sleeve is provided with an external thread, and the rear end is provided with an internal thread.

[0009] The two adjacent water-stop sleeves are connected by the external thread at the front end and the internal thread at the rear end.

[0010] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0011] This utility model uses an expansion waterstop strip on the outer wall of the waterstop sleeve. The expansion waterstop strip expands fully when it comes into contact with water, which fills the gap between the bare hole section of the sleeve and the soil layer to form a waterstop structure. At the same time, the upper and lower chucks can effectively prevent the expansion waterstop strip from shifting up and down, thus ensuring the waterstop effect. Attached Figure Description

[0012] Figure 1 is a structural schematic diagram of an embodiment of the present invention.

[0013] The attached diagrams are numbered and named as follows: 1. Expansion waterstop sleeve; 2. External thread; 3. Expansion waterstop belt; 4. Internal thread; 5. Lower chuck; 6. Waterstop sleeve; 7. Upper chuck. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] As shown in Figure 1, the present invention provides an expansion sealing sleeve suitable for isolating shallow pore water in hydrological observation wells. The expansion sealing sleeve 1 is composed of several sealing sleeves 6 connected by threads in sequence. An expansion sealing strip 3 is provided on the outer wall of the sealing sleeve 6. The tail end of the last sealing sleeve 6 is threaded to the front end of the second heavy pipe inside the root pipe. The expansion sealing strip 3 on the front sealing sleeve 6 corresponds to the bare hole section at the bottom of the root pipe.

[0017] The outer wall of the water-stop sleeve 6 is provided with an upper chuck 7 and a lower chuck 5 at its upper and lower ends, respectively. An expansion water-stop strip 3 is wrapped around the side wall of the water-stop sleeve 6 between the upper chuck 7 and the lower chuck 5. The raw material of the expansion water-stop strip 3 is expansion rubber, which has the characteristic of expanding and deforming when it comes into contact with water. Thus, the expansion water-stop strip 3 can fill the gap between the bare hole section of the sleeve and the soil layer after it comes into contact with water, forming a water-stopping structure. At the same time, in conjunction with the upper chuck 7 and the lower chuck 5, it can effectively prevent the expansion water-stop strip 3 from shifting up and down, thus ensuring the water-stopping effect.

[0018] The front end of the water-stop sleeve 6 is provided with an external thread 2, and the rear end of the water-stop sleeve 6 is provided with an internal thread 4 on the inner wall above the upper chuck 7. Adjacent water-stop sleeves 6 are connected by the external thread 2 at the front end and the internal thread 4 at the rear end. In actual use, the length of the expansion water-stop sleeve 1 is preferably 50cm, and the overall length of the water-stop sleeve 6 needs to be set according to the length of the bare hole section. After the expansion water-stop sleeve 1 is installed, the water in the well needs to be pumped out and monitored for no less than 24 hours to verify the water-stopping effect. If the water-stopping effect is good, the drill bit can be replaced for well completion operation.

Claims

1. An expansion sealing sleeve suitable for isolating shallow pore water in hydrological observation wells, characterized in that: It includes several water-stop sleeves (6) connected by threads in sequence. The outer wall of the water-stop sleeve (6) is covered with an expansion water-stop strip (3). The tail end of the water-stop sleeve (6) located at the rear is threaded to the front end of the second tube inside the root tube. The expansion water-stop strip (3) on the water-stop sleeve (6) located at the front corresponds to the bare hole section at the bottom of the root tube.

2. The expansion sealing sleeve for isolating shallow pore water in hydrological observation wells according to claim 1, characterized in that: The upper chuck (7) and lower chuck (5) are respectively provided at the upper and lower ends of the outer wall of the water-stop sleeve (6).

3. An expansion sealing sleeve for isolating shallow pore water in hydrological observation wells according to claim 2, characterized in that: The expansion waterstop (3) is located between the upper chuck (7) and the lower chuck (5).

4. An expansion sealing sleeve for isolating shallow pore water in hydrological observation wells according to claim 2, characterized in that: The front end of the water-stop sleeve (6) is provided with an external thread (2), and the rear end is provided with an internal thread (4).

5. An expansion sealing sleeve for isolating shallow pore water in hydrological observation wells according to claim 4, characterized in that: The two adjacent water-stop sleeves (6) are connected by the external thread (2) at the front end and the internal thread (4) at the rear end.

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