Coal seam sampling drilling tool of double-layer reverse circulation water deslagging directional drilling machine
By designing a double-layer reverse circulation water deslagging directional drilling rig for coal seam sampling, the inner and outer drill pipe structures separate the water injection channels, which solves the problem of coal sample being washed and loosened, realizes efficient coal sample collection, and improves the sampling success rate and safety.
Patent Information
- Application Number
- CN202422317243.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-09-23
AI Technical Summary
During the traditional water-drainage drilling sampling process, coal samples are easily washed out of the drill pipe by the water flow, and the coal samples are loose, resulting in sampling failure and excessive water content.
A double-layer reverse circulation water deslagging directional drilling rig for coal seam sampling is designed, which adopts an inner and outer drill pipe structure. The inner layer is a semi-closed sampling drill pipe, and the outer layer is a water injection hollow drill pipe. They are connected by a stabilizer to achieve the separation of coal sample storage and water injection channels, and change the water flow flushing direction.
It improves the success rate of coal body sampling in one time, reduces the water content of coal samples, shortens operation time, reduces labor intensity, and improves job safety.
Smart Images
Figure CN223359047U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of coal mine gas control, and in particular relates to a coal seam sampling drill tool of a double-layer reverse circulation water deslagging directional drilling rig. Background Art
[0002] According to regulations for evaluating the effectiveness of underground coal mine gas extraction, directional drilling and sampling of coal seams are required at designated measurement points in the area when directly measuring gas content in underground coal seams. To avoid fire accidents within the borehole, water slag removal is still used during drilling and sampling. The traditional sampling method involves using a directional drill to drill a hole in the sampling area. Once the hole has been drilled to the designated sampling location, the drill is withdrawn and the hollow sampling drill rod and drill bit are replaced. The water injection pressure is then reduced, and the coal sample is sampled by drilling 1-3 meters as normal. Finally, the drill is withdrawn and the coal sample from the sampling drill rod is collected in a dedicated coal sample storage tank.
[0003] In traditional water-drained sampling, the water flow within the hollow core sampling drill rod is opposite to the coal sampling direction. During the sampling process, the coal sample within the drill rod is easily washed out of the hole by the water flow, resulting in sampling failure. Furthermore, the coal sample collected within the drill rod is generally loose due to its high moisture content. During the drill withdrawal process, the coal sample is easily scattered to the bottom of the hole, resulting in insufficient sampling. Utility Model Content
[0004] The utility model aims to solve the problems that coal samples in the existing water-draining drilling sampling drill rod are easily washed out of the drill rod by water, and the coal samples are loose and have a high water content. The utility model provides a double-layer reverse circulation water-draining directional drilling rig coal seam sampling drill tool. The utility model realizes the separation of the coal sample storage and the water injection channel in the drill rod by designing a double channel inside the rod, changes the water flow flushing direction during the coal sample collection process, can greatly improve the success rate of one-time coal sampling, shorten the operation time, reduce labor intensity, and improve job safety.
[0005] The utility model adopts the following technical solutions:
[0006] A double-layer reverse circulation water deslagging directional drilling rig coal seam sampling drill tool comprises an outer water-injected hollow drill rod and an inner semi-enclosed sampling drill rod located within the outer water-injected hollow drill rod; the outer water-injected hollow drill rod and the inner semi-enclosed sampling drill rod are connected by a stabilizer, and a gap is provided between the outer water-injected hollow drill rod and the inner semi-enclosed sampling drill rod;
[0007] The outer water injection hollow drill rod comprises an outer drill rod, one end of which is provided with a reaming drill bit; the inner semi-enclosed sampling drill rod comprises an inner drill rod, one end of which, adjacent to the reaming drill bit of the outer drill rod, is provided with a coring drill bit; and the other end of the inner drill rod is provided with a pressure relief baffle.
[0008] The plane of the coring drill bit of the inner drill pipe extends out of the outside of the reaming drill bit of the outer drill pipe.
[0009] Furthermore, the stabilizer includes a circular ring welded to the outer wall of the inner drill pipe, and four connecting blocks are evenly arranged on the outer side of the circular ring in a cross shape, and the other end of the connecting block is welded to the inner wall of the outer drill pipe.
[0010] Furthermore, there are two stabilizers, each located 200 mm away from both ends of the inner drill rod.
[0011] Furthermore, a pressure relief hole is provided at the center of the pressure relief baffle, and the diameter of the pressure relief hole is 3 mm.
[0012] Furthermore, the center of the outer drill rod and the center of the inner drill rod are located on the same straight line.
[0013] Furthermore, the coring drill bit plane of the inner drill rod extends outward of the reaming drill bit of the outer drill rod by 30 mm.
[0014] Furthermore, the outer drill rod has a length of 1200 mm and an outer diameter of 95 mm.
[0015] Furthermore, the inner drill rod has a length of 1000 mm and an outer diameter of 63.5 mm.
[0016] The beneficial effects of the utility model are as follows:
[0017] The utility model separates the coal sample storage and water injection channels in the drill pipe by designing a dual channel inside the drill pipe, changing the direction of water flow during coal sample collection. This solves the problem of coal samples in the sampling drill pipe being easily washed out of the drill pipe by water, and the problem of loose coal samples and high water content. At the same time, it can greatly improve the success rate of coal sampling in one go, shorten operation time, reduce labor intensity, and improve job safety.
[0018] By using the utility model, the single success rate of fixed-point coal body sampling is high, the water content of the coal sample is low, and the block rate is high. The utility model is simple to operate and has high working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic diagram of the appearance structure of the utility model;
[0020] Figure 2 This is a schematic cross-sectional view of the utility model;
[0021] Among them: 1-stabilizer; 2-outer drill pipe; 3-reaming drill bit; 4-inner drill pipe; 5-coring drill bit; 6-pressure relief baffle; 7-pressure relief hole. DETAILED DESCRIPTION
[0022] The technical solution of the present invention will be described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0023] As shown in the figure, a double-layer reverse circulation water deslagging directional drilling rig coal seam sampling drill tool includes an outer water-injected hollow drill rod, an inner semi-enclosed sampling drill rod, and a stabilizer 1. The inner semi-enclosed sampling drill rod includes a coring drill bit 5, an inner drill rod 4, and a pressure relief baffle 6. The inner drill rod 4 is a smooth hollow iron drill rod with a length of 1000mm and an outer diameter of 63.5mm. A matching diamond composite core drill bit 5 is installed at the front end, and a pressure relief baffle 6 is welded to the rear end. A small pressure relief hole with a diameter of 3mm is reserved in the center of the pressure relief baffle 6. A stabilizer 1 is installed at a position 200mm away from the front and rear ends of the inner drill rod 4. The stabilizer 1 is welded between the inner semi-enclosed sampling drill rod and the outer water-injected hollow drill rod to support, fix and connect the outer drill rod.
[0024] The outer water-injection hollow drill pipe consists of an outer drill pipe 2 and a reamer drill bit 3. The outer drill pipe 2 is a smooth, hollow iron drill pipe with a length of 1200 mm and an outer diameter of 95 mm. The front of the outer drill pipe is equipped with a matching diamond composite reamer drill bit 3. The plane of the core drill bit 5 extends 30 mm beyond the plane of the reamer drill bit 3.
[0025] The method of using the utility model is as follows:
[0026] After the directional drilling construction is completed and the present invention is replaced, high-pressure water flows into the drill pipe through the water tail of the drill pipe. When passing through the outer water-injected hollow drill pipe of the present invention, the water flows out from the reaming drill bit 3 along the space between the inner drill pipe 4 and the outer drill pipe 2 and enters the bottom of the borehole, and then returns to the hole along the space between the outer drill pipe 2 and the borehole wall.
[0027] When the drill rod rotates and propels to drill coal samples, the coring drill bit 5 is the first to contact and cut the coal body at the bottom of the hole because it is ahead of the reaming drill bit 3. Most of the cut coal samples are accumulated in the inner drill rod 4 under the combined action of the drill rod propulsion and water pressure, and a small amount of coal slag is returned to the outside of the hole along the space between the outer drill rod 2 and the borehole wall with the water flow.
[0028] The drilling rig is stopped after rotating and drilling 1-1.5 meters, and after the drill pipe is slowly withdrawn, the coal sample in the inner drill pipe 4 is taken out and stored.
Claims
1. A double-layer reverse circulation water deslagging directional drilling rig coal seam sampling drill tool, characterized by: It comprises an outer water-injected hollow drill rod and an inner semi-enclosed sampling drill rod located within the outer water-injected hollow drill rod; the outer water-injected hollow drill rod and the inner semi-enclosed sampling drill rod are connected via a stabilizer (1), and a gap is provided between the outer water-injected hollow drill rod and the inner semi-enclosed sampling drill rod; The outer water-injection hollow drill rod comprises an outer drill rod (2), one end of which is provided with a reaming drill bit (3); the inner semi-enclosed sampling drill rod comprises an inner drill rod (4), one end of the inner drill rod (4) close to the reaming drill bit (3) of the outer drill rod (2) is provided with a coring drill bit (5); and the other end of the inner drill rod (4) is provided with a pressure relief baffle (6); The coring drill bit (5) of the inner drill rod (4) extends outward from the reaming drill bit (3) of the outer drill rod (2); a pressure relief hole (7) is provided at the center of the pressure relief baffle (6), and the diameter of the pressure relief hole (7) is 3 mm.
2. The double-layer reverse circulation water deslagging directional drilling rig coal seam sampling drill according to claim 1, characterized in that: The stabilizer (1) comprises a circular ring welded to the outer wall of the inner drill rod (4), and four connecting blocks are evenly arranged on the outer side of the circular ring in a cross shape, and the other end of the connecting block is welded to the inner wall of the outer drill rod (2).
3. The double-layer reverse circulation water deslagging directional drilling rig coal seam sampling drill tool according to claim 2, characterized in that: There are two stabilizers (1), each located 200 mm away from both ends of the inner drill rod (4).
4. The double-layer reverse circulation water deslagging directional drilling rig coal seam sampling drill according to claim 1, characterized in that: The center of the outer drill rod (2) and the center of the inner drill rod (4) are located on the same straight line.
5. The double-layer reverse circulation water deslagging directional drilling rig coal seam sampling drill tool according to claim 1, characterized in that: The coring drill bit (5) of the inner drill rod (4) extends outward from the reaming drill bit (3) of the outer drill rod (2) by a distance of 30 mm.
6. The double-layer reverse circulation water deslagging directional drilling rig coal seam sampling drill tool according to claim 1, characterized in that: The outer drill rod (2) has a length of 1200 mm and an outer diameter of 95 mm.
7. The double-layer reverse circulation water deslagging directional drilling rig coal seam sampling drill according to claim 1, characterized in that: The inner drill rod (4) has a length of 1000 mm and an outer diameter of 63.5 mm.