A drill-in tubing assembly and its wireline coring drill

Abstract

The application discloses a drill pipe inner tube assembly and a rope core drilling tool, and the drill pipe inner tube assembly comprises a relatively rotatable upper inner tube assembly part and a lower inner tube assembly part, and a rotating shaft and a single-acting mechanism are arranged between the upper inner tube assembly part and the lower inner tube assembly part; the single-acting mechanism comprises a bearing seat and a thrust ball bearing, a bearing is arranged in the shaft part of the bearing seat, the rotating shaft is connected to the thrust ball bearing of the bearing seat, and the bearing seat is provided with a sealing ring seat which is sealed with the rotating shaft. The rope core drilling tool comprises the drill pipe inner tube assembly. The application can avoid the drilling fluid from entering the bearing, effectively protect the bearing and guarantee the single-acting performance of the drill pipe; and the application is beneficial to popularizing the application of the rope core drilling process in the fields of water conservancy and hydropower, engineering investigation, rare earth mineral investigation and the like.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, and in particular to a drill string inner tube assembly and its wireline coring drill string. Background Technology

[0002] Wireline coring is a drilling method that retrieves rock cores from inside an outer casing without lifting the casing string. It is now widely used both domestically and internationally, and has been extensively applied in fields such as land resources, metallurgy, and coal mining.

[0003] However, wireline coring is rarely used in engineering geological exploration, rare earth mineral exploration, and hydropower exploration. The reason is that these types of exploration drilling have higher requirements for core recovery rate and core quality, especially for complex overburden layers, weak interlayers, and hard, brittle, and fragmented strata, where accurate geological information is required through coring. Therefore, the quality requirements for coring are high. Traditional wireline coring tools are mostly used in rock formations and deep holes, and less so in overburden layers and shallow holes. The impact of the single-action performance between the inner and outer tubing of the drill bit on coring quality is not emphasized. Therefore, the use of rudimentary single-action mechanisms leads to unreliable single-action performance between the inner and outer tubing of the drill bit. This can easily affect coring quality during drilling due to poor isolation of single-action performance. Especially in cases involving complex overburden layers, weak interlayers, and hard, brittle, and fragmented strata, the coring quality cannot meet the relevant requirements.

[0004] Traditional wireline coring drills typically lack protection for the bearings of their single-action mechanisms, leaving them directly exposed to the drilling fluid during operation. Rock dust particles carried in the drilling fluid can easily cause the bearings to seize, affecting the single-action performance of the drill string and consequently impacting the quality of the cored sample. This is especially problematic in applications requiring circulating mud or high-concentration mud, where it can directly lead to drill string jamming and loss of single-action capability, severely limiting the application of wireline coring drilling technology in water conservancy and hydropower, engineering exploration, and rare earth mineral exploration. Summary of the Invention

[0005] The purpose of this invention is to provide a drill string inner tube assembly and its wireline coring drill string, which prevents drilling fluid from entering the bearing during drilling, effectively protects the bearing, and ensures the single-action performance of the drill string; it also facilitates the application of wireline coring drilling technology in fields such as water conservancy and hydropower, engineering exploration, and rare earth mineral exploration.

[0006] To achieve the above objectives, the technical solution provided by the present invention is: a drill bit inner tube assembly, comprising an upper part and a lower part of the inner tube assembly that can rotate relative to each other, connected by a rotating shaft and a single-action mechanism. The single-action mechanism includes a bearing seat and a thrust ball bearing, the bearing being built into the shaft portion of the bearing seat, the rotating shaft being connected to the thrust ball bearing of the bearing seat, and the bearing seat being provided with a sealing ring seat that seals with the rotating shaft.

[0007] The present invention adopts the above-mentioned technical solution, wherein the rotating shaft connects to the upper part of the inner tube assembly and is set in the bearing seat through a thrust ball bearing, so as to realize the relative rotation between the upper part and the lower part of the inner tube assembly. A sealing ring seat is set on the bearing seat to achieve good sealing of the thrust ball bearing in the bearing seat. In actual use, drilling fluid, flushing fluid and mud are prevented from entering the bearing, effectively protecting the bearing and achieving effective isolation of the single-action mechanism, thus ensuring the single-action performance of the drill string inner tube assembly.

[0008] The aforementioned drill string inner tube assembly has an upper and lower shaft portion in the bearing housing. The thrust ball bearing includes a thrust bearing and a suspension bearing, which are respectively housed in the upper and lower shaft portions of the bearing housing. The rotating shaft passes through the thrust bearing and suspension bearing of the bearing housing and has a lock nut at its lower end. The thrust bearing and suspension bearing support the rotation of the rotating shaft, and the lock nut at the lower end of the rotating shaft is used to lock and fix the rotating shaft, ensuring its axial positioning and preventing relative movement.

[0009] The aforementioned drill bit inner tube assembly has an internal thread on the upper shaft of the bearing housing and an external thread on the sealing ring seat, which is screwed between the upper shaft and the rotating shaft.

[0010] The aforementioned drill bit inner tube assembly has an external thread on the lower shaft of the bearing seat, which is screwed onto an outer seat.

[0011] The aforementioned drill string inner tube assembly has a shaft seal ring on the rotating shaft, which seals the shaft to the sealing valve seat. The shaft seal ring ensures a tight seal between the shaft and the sealing valve seat.

[0012] In the aforementioned drill bit inner tube assembly, the bearing housing, sealing ring seat, and outer seat are sealed by a first sealing ring and a second sealing ring. The first and second sealing rings effectively ensure the sealing of the threaded connection between the bearing housing, sealing ring seat, and outer seat.

[0013] The aforementioned drill bit inner tube assembly includes an inner tube cap and a spindle at the lower part. The spindle connects the outer seat and the inner tube cap, and the inner tube cap is connected to the inner tube.

[0014] The aforementioned drill string inner tube assembly has a detachable cap on the inner tube cap. The lower end of the spindle extends into the inner tube cap through the cap, and a compression spring is installed between the cap and the bottom end of the spindle. During core extraction, lifting the drill string moves the outer tube and outer tube assembly upwards. The snap ring clamps the core, holding the inner tube, inner tube cap, bearing housing, and other components stationary. The compression spring is compressed, providing a buffering effect and protecting the inner tube. During each pulling motion, the spindle portion inside the inner tube cap is pulled out, increasing the internal space of the inner tube cap and creating a negative pressure. This negative pressure draws drilling fluid into the inner tube. However, because the spindle is mounted on the outer seat, and the outer seat and bearing housing are connected by threads to form a seal, the drilling fluid does not enter the bearing housing and does not affect the bearing's operation.

[0015] The aforementioned drill bit inner tube assembly includes, from top to bottom, a spear-retrieval mechanism, a spring-loaded mechanism, and a recovery tube. The single-action mechanism is connected to the spring-loaded mechanism via a rotating shaft.

[0016] The aforementioned drill bit inner tube assembly includes a spring-loaded chuck mechanism comprising a spring-loaded chuck holder and a spring-loaded chuck clamp housed within the retrieval tube. The spring-loaded chuck clamp is secured within the spring-loaded chuck holder via a spring-loaded spring. When deployed, the chuck clamp's two wings extend beyond the retrieval tube. The bottom end of the spring-loaded chuck holder is connected to the rotating shaft via a lower connector. The spring-loaded chuck clamp extends beyond the retrieval tube via the spring-loaded spring, serving to position and secure the drill bit assembly. During core retrieval, the upward-pulling retrieval mechanism pulls the retrieval tube, causing the spring-loaded chuck clamp to retract inward and release, allowing for core retrieval.

[0017] The aforementioned drill string inner tube assembly has a suspension ring at the top of the lower connector of the spring clip. When the drill string inner tube assembly is assembled into the outer tube assembly, after the inner tube assembly reaches the predetermined position of the outer tube assembly, the suspension ring abuts against the seat ring in the outer tube assembly to achieve the installation positioning function.

[0018] The aforementioned drill string inner tube assembly has a flushing fluid channel at the bottom of the spring clip holder and a drilling fluid channel on the lower connector of the spring clip holder. The flushing fluid channel is connected to the drilling fluid channel, and a positioning signal sleeve and a freely movable steel ball are installed between them. After the drill string inner tube assembly is assembled into the predetermined position in the outer tube assembly, the flushing fluid channel is blocked, forcing the flushing fluid to change its flow direction. The increased water pressure causes the steel ball to pass through the positioning signal sleeve and move downwards, opening the flushing fluid channel. At the same time as the steel ball passes through the positioning signal sleeve, the pressure on the ground through the pump pressure gauge rises significantly and then suddenly drops, indicating that the inner tube assembly has reached the drilling position.

[0019] Another solution provided by the present invention is: a wireline coring drill bit, comprising the above-mentioned drill bit inner tube assembly.

[0020] The aforementioned wireline coring drill includes an outer tube assembly, a drill bit, and a reamer. The reamer and drill bit are located at the bottom end of the outer tube assembly, and the inner tube assembly is assembled within the outer tube assembly.

[0021] The aforementioned wireline coring drill assembly includes an outer tube, with a reamer and drill bit located at the bottom end of the outer tube.

[0022] The aforementioned wireline coring drill bit includes an outer tube assembly comprising a chuck chamber and a chuck stop, with the chuck stop engaging with the chuck clamp of the inner tube assembly. After the inner tube assembly is installed in the chuck chamber position within the outer tube assembly, the chuck clamp unfolds and rests against the bottom end of the chuck stop, preventing axial movement of the inner tube assembly.

[0023] The aforementioned wireline coring drill has a seat ring inside the outer tube, and the drill string inner tube assembly is positioned and assembled on the seat ring via a suspension ring. In specific implementation, the drill string inner tube assembly is connected to the inner tube through an inner tube cap. When assembled in the outer tube, the positioning function is achieved through the positioning of the suspension ring and the seat ring. Once the drill string inner tube assembly is in place, hole sweeping and drilling can proceed.

[0024] The beneficial effects of this invention are as follows: the thrust bearing and suspension bearing that realize the single-action function are installed in the bearing housing. The upper end of the bearing housing is sealed by a sealing ring seat, and the lower end is sealed by a threaded connection to the outer seat. The bearing has no contact with the drilling fluid, the single-action performance of the bearing is stable, the service life is long, and maintenance-free. The compression spring is separated from the rotating parts such as the shaft and the spring clip mechanism. When stretched and compressed, the drilling fluid that enters will not flow and affect the single-action performance of the bearing. The drill string inner tube assembly can be interchanged with the drill string inner tube assembly of the traditional wireline coring drill string, which is flexible and convenient to use and helps to promote the application of wireline coring drilling technology in the fields of water conservancy and hydropower, engineering exploration, and rare earth mineral exploration. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the drill inner tube assembly according to an embodiment of the present invention;

[0026] Figure 2 This is a cross-sectional structural schematic diagram of the drill inner tube assembly according to an embodiment of the present invention;

[0027] Figure 3 This is a partial enlarged view of the drill inner tube assembly according to an embodiment of the present invention;

[0028] Figure 4 This is a three-dimensional structural schematic diagram of the wireline coring drill tool according to an embodiment of the present invention;

[0029] Figure 5 This is a cross-sectional structural diagram of the wireline coring drill according to an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached drawings: Upper part of inner tube assembly 1a, single-action mechanism 1, rotating shaft 11, rotating shaft seal ring 111, locking nut 112, bearing seat 12, first seal ring 121, second seal ring 122, upper shaft part 123, lower shaft part 124, thrust ball bearing 13, thrust bearing 131, suspension bearing 132, sealing ring seat 14, outer seat 15, receiving groove 151, spear-catching mechanism 16, spear-catching head 161, spear-catching seat 162, recovery tube 163, side hole 164, spring-loaded mechanism 17, spring-loaded bracket 171, spring-loaded clamp 172, embedded spring. 173, spring clip holder lower connector; 174, flushing fluid channel; 175, drilling fluid channel; 176, arrival signal sleeve; 177, steel ball; 178, suspension ring; 18, lower part of inner tube assembly 2a; spindle; 21, anti-loosening nut; 211, inner tube cap; 22, cover cap; 221, compression spring; 222, check valve; 223, arrival alarm rubber ring; 23, shut-off valve gasket; 24, inner tube; 25, snap ring seat; 251, snap ring; 252, outer tube assembly 3; outer tube; 31, drill bit; 32, seat ring; 33, spring clip chamber; 34, spring clip stop; 35, reamer; 36, centralizing ring; 37. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, a drill bit inner tube assembly includes an upper part 1a and a lower part 2a of the inner tube assembly that can rotate relative to each other, connected by a rotating shaft 11 and a single-action mechanism 1. The single-action mechanism 1 includes a bearing housing 12 and a thrust ball bearing. The bearing is built into the shaft portion of the bearing housing 12, and the rotating shaft 11 is connected to the thrust ball bearing of the bearing housing 12. The bearing housing 12 is provided with a sealing ring seat 14 that seals with the rotating shaft 11.

[0033] The bearing housing 12 is provided with an upper shaft portion 123 and a lower shaft portion 124. The thrust ball bearing includes a thrust bearing 131 and a suspension bearing 132, which are respectively built into the upper shaft portion 123 and the lower shaft portion 124 of the bearing housing 12. The rotating shaft 11 passes through the thrust bearing 131 and the suspension bearing 132 of the bearing housing 12, and a locking nut 112 is provided at the lower end.

[0034] The upper shaft portion 123 of the bearing housing 12 is provided with internal threads, and the sealing ring seat 14 is provided with external threads and is screwed between the upper shaft portion 123 and the rotating shaft 11. The lower shaft portion 124 of the bearing housing 12 is provided with external threads and is screwed with an outer seat 15.

[0035] A sealing ring seat 14 is located on the upper edge of the bearing housing 12. The main shaft 21 is connected to the bottom end of the bearing housing 12 via an outer seat 15, forming a sealed space. The thrust bearing 131 and the suspension bearing 132 are located in the bearing housing 12, supporting the rotation of the shaft 11. During drilling, drilling fluid and flushing fluid will not enter the interior of the bearing housing 12 and will not come into contact with the thrust bearing 131 and the suspension bearing 132, thus not affecting the single-action performance of the bearings. Furthermore, because it forms a seal on the bearing housing 12, it effectively protects the bearings and extends the service life of the thrust bearing 131 and the suspension bearing 132.

[0036] In this embodiment, the rotating shaft 11 is provided with a rotating shaft sealing ring 111, and the rotating shaft 11 and the sealing valve seat 36 are sealed by the rotating shaft sealing ring 111. The bearing seat 12 is sealed with the sealing ring seat 14 and the main shaft 21 by a first sealing ring 121 and a second sealing ring 122.

[0037] The lower part 2a of the inner tube assembly includes an inner tube cap 22 and a main shaft 21. The main shaft 21 connects the outer seat 15 and the inner tube cap 22, and the inner tube cap 22 is connected to the inner tube 25.

[0038] Furthermore, a cap 221 is detachably mounted on the inner tube cap 22. The lower end of the main shaft 21 passes through the cap 221 and extends into the inner tube cap 22. A compression spring 222 is provided between the cap 221 and the bottom end of the main shaft 21. During assembly, the main shaft 21 passes through the cap 221 and extends into the inner tube cap 22. The cap 221 is then fitted onto the top of the inner tube cap 22, completing the connection between the main shaft 21 and the inner tube cap 22. The inner tube cap 22 is used to connect the inner tube. A check valve 223 is provided on the inner tube cap 22 to prevent flushing fluid from entering the inner tube 25 and affecting core storage. During drilling, when the core enters the inner tube 25, the drilling fluid at the top of the core and the top of the inner tube 25 can be discharged unidirectionally through the check valve 223.

[0039] The outer seat 15 is provided with a receiving groove 151 for accommodating the rotating shaft 11 extending from the bottom end of the bearing seat 12 and the locking nut 112. The outer seat 15 is threadedly connected to the bearing seat 12. The bottom end of the main shaft 21 extends into the inner tube cap 22. A compression spring 222 is provided between the cap 221 and the bottom end of the main shaft 21. The bottom end of the main shaft 21 is provided with an anti-loosening nut 211, and the compression spring 222 is located between the anti-loosening nut 211 and the cap 221.

[0040] A positioning alarm rubber ring 23 and a flow control valve gasket 24 are installed between the top of the cap 221 and the main shaft 21. During drilling, if core blockage occurs or the inner tube 25 is filled with core material, the core will exert a pushing force on the inner tube 25. The spring-loaded mechanism 17 restricts the upward movement of the inner tube assembly, causing the positioning alarm rubber ring 23 and the flow control valve gasket 24 to be squeezed by the upward pushing force. The positioning alarm rubber ring 23 deforms and expands, reducing or blocking the gap between the inner and outer tube rings, thus obstructing the flow of flushing fluid. By detecting the increase in flushing fluid pump pressure, it is determined that the core tube is blocked, and drilling should be stopped to retrieve the core.

[0041] The upper part 1a of the inner tube assembly includes a spear-catching mechanism 16, a spring-loaded mechanism 17 and a recovery tube 163 connected from top to bottom. The single-action mechanism 1 is connected to the spring-loaded mechanism 17 via a rotating shaft 11.

[0042] The spear retrieval mechanism 16 includes a spearhead 161 and a spearhead seat 162. The spearhead 161 and the spearhead seat 162 are movably connected, and the spearhead seat 162 is fixedly connected to the recovery pipe 163. When retrieving the inner tube assembly for core extraction, the retrieval tool is lowered from inside the drill pipe to the upper end of the inner tube assembly. The retrieval tool hooks the spearhead 161, and the retrieval tool is lifted upwards, pulling the spearhead 161 upwards. The spearhead 161 lifts the recovery pipe 163 upwards through the spearhead seat 162, forcing the spring clamp 172 to retract, thus separating the inner tube assembly from the outer tube assembly 3, thereby lifting the inner tube assembly up.

[0043] The ejector mechanism 17 includes an ejector holder 171 and an ejector clamp 172 disposed in the recovery tube 163. The ejector clamp 172 is disposed in the ejector holder 171 via a spring 173. When the ejector clamp 172 is deployed, its two wings extend out of the recovery tube 163. The bottom end of the ejector holder 171 is connected to the rotating shaft 11 via a lower connector 174. A suspension ring 18 is provided at the top end of the lower connector 174.

[0044] The spring-loaded caliper 172 is extended outward by the spring-loaded spring 173, pressing against the bottom of the spring-loaded chamber 34 to form a locked state. This prevents axial movement of the inner tube 25 during core filling during drilling. When the inner tube assembly is lifted to retrieve the core using a lifting device, the lifting device pulls the retrieval mechanism 16, which in turn pulls the recovery pipe 163 upward. The side hole 164 on the side of the recovery pipe 163 pushes the spring-loaded caliper 172 upward, causing it to move towards the center and disengage from the spring-loaded chamber 34, thus separating the drill string inner tube assembly from the outer tube 31. The drill string inner tube assembly and inner tube 25 can then be lifted out to retrieve the core.

[0045] The bottom of the spring clip holder 171 is provided with a flushing fluid channel 175, and the lower connector 174 of the spring clip holder is provided with a drilling fluid channel 176. The flushing fluid channel 175 is connected to the drilling fluid channel 176, and a positioning signal sleeve 177 and a freely movable steel ball 178 are provided between them.

[0046] Reference Figures 1 to 5 As shown, a wireline coring drill bit includes the drill bit inner tube assembly described in the above specific embodiments.

[0047] The outer tube assembly 3, drill bit 32, and reamer 36 are located at the bottom end of the outer tube assembly 3, and the inner tube assembly of the drill tool is assembled in the outer tube assembly 3.

[0048] The outer tube assembly 3 includes an outer tube 31, a reamer 36 and a drill bit 32 located at the bottom end of the outer tube 31.

[0049] The outer tube assembly 3 includes a spring-loaded chamber 34 and a spring-loaded stop 35, which abuts against the spring-loaded clamp 172 of the inner tube assembly of the drill bit.

[0050] The outer tube 31 is equipped with a seat ring 33, and the drill string inner tube assembly is positioned and assembled on the seat ring 33 by the suspension ring 18.

[0051] In a specific implementation of this invention, the inner tube assembly of the drill bit is first connected to the inner tube 25. The bottom end of the inner tube 25 is provided with a snap ring seat 251 and a snap ring 252. The inner tube assembly, the inner tube 25, the snap ring seat 251, and the snap ring 252 constitute the inner tube assembly. The bottom end of the outer tube 31 is provided with a reamer 36, and the drill bit 32 is located at the bottom end of the reamer 36. A straightening ring 37 is provided inside the reamer 36. The straightening ring 37 is used for straightening and guiding the inner tube, keeping the inner tube 25 and the outer tube 31 coaxial, facilitating the entry of the core sample into the snap ring seat 251 and the inner tube 25. The outer tube 31, the spring-loaded chuck chamber 34, the seat ring 33, the straightening ring 37, the reamer 36, the drill bit 32, and the spring-loaded chuck stop 35 constitute the outer tube assembly 3.

[0052] In use, the inner tube assembly is assembled into the outer tube assembly 3. As the inner tube assembly descends within the outer tube assembly 3, when the suspension ring 18 abuts against the seat ring 33, the inner tube assembly is in place. At this point, the steel ball 178, through the pump pressure change caused by the arrival signal sleeve 177, determines that the inner tube assembly is in place. The spring-loaded clamp 172 of the spring-loaded clamp mechanism 17 unfolds under the action of the spring 173, and its two wings extend and press against the bottom end of the spring-loaded stop head 35, thus positioning the inner tube assembly within the outer tube assembly 3.

[0053] During operation, the drilling rig drives the drill rod (not shown in the figure) to rotate. The drill rod is connected to the spring-loaded stop 35, which is connected to the spring-loaded chamber 34. The spring-loaded chamber 34 is connected to the outer tube 31. The drill rod drives the outer tube 31 to rotate, and the outer tube 31 drills through the drill bit 32 and the reamer 36 located at its bottom. The outer tube 31 drives the drill bit 32 at its bottom to cut through the rock strata, causing the spring-loaded mechanism 17 to rotate. The spring-loaded mechanism 17 is connected to the rotating shaft 11 through the spring-loaded bracket 171 and the lower connector 174 of the spring-loaded bracket. The rotating shaft 11 is rotatable in the bearing seat 12 through the thrust bearing 131 and the suspension bearing 132. The bearing seat 12, the main shaft 21, the inner tube cap 22, and the inner tube 25 do not rotate with it, achieving a single-action effect.

[0054] During drilling, flushing fluid and drilling fluid will not enter the interior of the bearing housing 12. Through the isolation provided by the sealing ring seat 14 and the main shaft 21, a good seal is achieved for the thrust bearing 131 and the suspension bearing 132, protecting the bearing's single-action performance. Due to the sealed protection of the thrust bearing 131 and the suspension bearing 132, this invention can be applied to fields such as water conservancy and hydropower, engineering surveying, and rare earth mineral exploration, enabling its widespread application.

[0055] In summary, as described in the specification and figures, the present invention has been manufactured into actual samples and subjected to multiple usage tests. The results of these tests demonstrate that the present invention achieves its intended purpose, and its practical value is undeniable. The embodiments described above are merely illustrative examples and are not intended to limit the present invention in any way. Any person skilled in the art who makes partial modifications or alterations to the technical content disclosed in the present invention, without departing from the scope of the technical features of the present invention, shall still fall within the scope of the technical features of the present invention.

Claims

1. A drill bit inner tube assembly, comprising an upper part (1a) and a lower part (2a) of the inner tube assembly that are rotatable relative to each other, connected therebetween by a rotating shaft (11) and a single-action mechanism (1), wherein the single-action mechanism (1) comprises a bearing seat (12) and a thrust ball bearing, characterized in that: The thrust ball bearing is built into the shaft portion of the bearing housing (12), and the rotating shaft (11) is connected to the thrust ball bearing in the bearing housing (12). The bearing housing (12) is provided with a sealing ring seat (14) that seals with the rotating shaft (11). The bearing housing (12) is provided with an upper shaft part (123) and a lower shaft part (124). The thrust ball bearing includes a thrust bearing (131) and a suspension bearing (132), which are respectively built into the upper shaft part (123) and the lower shaft part (124) of the bearing housing (12). The rotating shaft (11) passes through the thrust bearing (131) and the suspension bearing (132) of the bearing housing (12), and a locking nut (112) is provided at the lower end. The upper shaft portion (123) of the bearing housing (12) is provided with an internal thread, and the sealing ring seat (14) is provided with an external thread and is screwed between the upper shaft portion (123) and the rotating shaft (11); The lower shaft portion (124) of the bearing housing (12) is provided with external threads and is screwed to an outer seat (15). The rotating shaft (11) is provided with a rotating shaft sealing ring (111), and the rotating shaft (11) and the sealing valve seat are sealed by the rotating shaft sealing ring (111); the bearing seat (12) is sealed with the sealing ring seat (14) and the outer seat (15) by the first sealing ring (121) and the second sealing ring (122); The lower part (2a) of the inner tube assembly includes an inner tube cap (22) and a main shaft (21). The main shaft (21) connects the outer seat (15) and the inner tube cap (22). The inner tube cap (22) is connected to the inner tube (25). The inner tube cap (22) is detachably equipped with a cap (221). The lower end of the main shaft (21) passes through the cap (221) and extends into the inner tube cap (22). A compression spring (222) is provided between the cap (221) and the bottom end of the main shaft (21).

2. The drill string inner tube assembly according to claim 1, characterized in that: The upper part (1a) of the inner tube assembly includes a spear-catching mechanism (16), a spring-loaded mechanism (17) and a recovery tube (163) connected from top to bottom. The single-action mechanism (1) is connected to the spring-loaded mechanism (17) via a rotating shaft (11).

3. The drill string inner tube assembly according to claim 2, characterized in that: The ejector mechanism (17) includes an ejector holder (171) and an ejector clamp (172) disposed in the recovery tube (163). The ejector clamp (172) is disposed in the ejector holder (171) via a spring (173). When the ejector clamp (172) is unfolded, its two wings extend out of the recovery tube (163). The bottom end of the ejector holder (171) is connected to the rotating shaft (11) via the lower connector (174) of the ejector holder.

4. The drill string inner tube assembly according to claim 3, characterized in that: The top of the lower connector (174) of the cartridge holder is provided with a suspension ring (18).

5. The drill string inner tube assembly according to claim 3, characterized in that: The bottom of the spring clip holder (171) is provided with a flushing fluid channel (175), and the lower connector (174) of the spring clip holder is provided with a drilling fluid channel (176). The flushing fluid channel (175) is connected to the drilling fluid channel (176), and a positioning signal sleeve (177) and a freely movable steel ball (178) are provided between them.

6. A wireline coring tool, characterized in that: Includes the drill string inner tube assembly as described in any one of claims 1-5.

7. The wireline coring drill according to claim 6, characterized in that: It includes an outer tube assembly (3), a drill bit (32) and a reamer (36), with the reamer (36) and the drill bit (32) located at the bottom of the outer tube assembly (3), and the drill inner tube assembly is assembled in the outer tube assembly (3).

8. The wireline coring drill according to claim 7, characterized in that: The outer tube assembly (3) includes an outer tube (31), a reamer (36) and a drill bit (32) located at the bottom end of the outer tube (31).

9. The wireline coring drill according to claim 8, characterized in that: The outer tube assembly (3) includes a spring clip chamber (34) and a spring clip stop (35), which abuts against the spring clip clamp (172) of the inner tube assembly of the drill bit.

10. The wireline coring drill according to claim 8, characterized in that: The outer tube (31) is equipped with a seat ring (33), and the drill bit inner tube assembly is positioned and assembled on the seat ring (33) by a suspension ring (18).

Images