Flexible rope coring mechanism for directional drilling

Abstract

The present invention discloses a flexible rope coring mechanism for directional drilling in the field of geological survey technology. The mechanism comprises a catcher, a fixing mechanism, and a coring tube. A water flow disperser is provided at the upper end of the catcher, and a fishing rope tube is connected to the upper end of the water flow disperser. A water inlet pipe connected to the fishing rope tube is provided within the water flow disperser. A water outlet pipe connected to the water inlet pipe is provided around the periphery of the water flow disperser, and the outlet pipe discharges water toward the upper or obliquely upward direction of the water flow disperser. The coring tube comprises a flexible spring tube formed by spirally winding metal strips, and a wear-resistant flexible wrapping layer covering the inner and outer walls of the flexible spring tube. The present invention provides a water flow disperser on the catcher. During coring, high-pressure water ejected from the water flow disperser can be used to propel the entire device within the drill pipe, thereby stably delivering the coring mechanism to the bottom hole operation area. The flexible coring tube can adapt to the curved drilling process of directional drilling, ensuring coring efficiency and the integrity of while-drilling coring.

Description

Technical Field

[0001] The present invention relates to the technical field of geological surveying, and in particular to a flexible rope coring mechanism for directional drilling. Background Art

[0002] Currently, most rope coring mechanisms commonly used in engineering drilling are unpowered and utilize rigid coring tubes. These mechanisms present several major challenges: The lack of a power source means the entire coring mechanism can only be lowered to the hole bottom by gravity, making it primarily suitable for vertical and inclined drilling. For horizontal and directional drilling, where gravity is not sufficient to lower the device to the hole bottom, external equipment is typically required. For example, after the drill is lifted, the coring mechanism is first installed within the drill pipe, and then lowered using the drill pipe. This significantly reduces coring efficiency. Furthermore, rigid coring tubes cannot undergo reversible flexible bending deformation, making them suitable only for horizontal, vertical, and inclined drilling, but not for directional drilling applications with a specific curvature. Therefore, in order to achieve coring while drilling and meet the curvature requirements of the coring tube for directional drilling, a flexible coring mechanism suitable for directional drilling is needed. Summary of the Invention

[0003] In order to overcome the shortcomings of existing coring mechanisms that are not suitable for curved directional drilling coring, the technical problem to be solved by the present invention is to provide a flexible rope coring mechanism suitable for directional drilling with power propulsion and a flexible coring tube.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A flexible rope coring mechanism for directional drilling comprises a fisher, a fixing mechanism and a coring tube, wherein the upper end of the fixing mechanism is provided with a fisher head which can be docked with the fisher, and the middle part of the fixing mechanism is provided with a retaining spring mechanism which can be clamped with the drill rod, and the coring tube is arranged at the lower end of the fixing mechanism, and the upper end of the fisher is provided with a water flow disperser, and the upper end of the water flow disperser is connected with a salvaging rope tube, and the water flow disperser is provided with an inlet pipe connected with the salvaging rope tube, and the periphery of the water flow disperser is provided with a water outlet pipe connected with the water inlet pipe, and the water outlet direction of the water outlet pipe is toward the top or obliquely above the water flow disperser; the coring tube is a flexible coring tube, comprising a flexible spring tube formed by winding a metal strip along a spiral structure, and a wear-resistant flexible wrapping layer covering the inner and outer walls of the flexible spring tube.

[0006] Furthermore, the water inlet pipe of the water flow disperser is arranged along its axial direction, and the water outlet pipes include at least two and are rotationally symmetrically arranged around the axis of the water inlet pipe.

[0007] Furthermore, the lower end of the fishing device is provided with an elastic locking tongue that can be engaged with the fishing head, and the fishing head is arranged at the upper end of the fixing mechanism through a connecting tube, and a movable conical cap is slidably provided on the connecting tube, and the movable conical cap and the fishing head are both frustum-shaped structures, wherein the conical surface of the fishing head faces upward, and the conical surface of the movable conical cap faces downward, and the outer diameter of the large end of the movable conical cap is larger than the outer diameter of the large end of the fishing head, and a shaft shoulder is provided in the middle of the connecting tube, and the movable conical cap contacts the upper end of the shaft shoulder under the action of gravity, leaving space for the elastic locking tongue to engage between the movable conical cap and the fishing head, and between the movable conical cap and the top of the fixing mechanism.

[0008] Furthermore, the fish catcher includes a fish catcher tube, a mounting hole is provided at the lower end of the fish catcher, the axis of the mounting hole is perpendicular to the axis of the fish catcher, the elastic locking tongue is slidably arranged in the mounting hole, an inclined surface is provided below one end of the elastic locking tongue close to the middle of the fish catcher, and a bolt is provided at the other end, the bolt passes through the positioning plate at the outer end of the mounting hole and is connected to the nut, and a first spring is sleeved on the bolt.

[0009] Furthermore, the elastic locking tongues include at least two and are rotationally symmetrically arranged around the axis of the fishing tube.

[0010] Furthermore, the fixing mechanism includes a fixing tube, the lower end of the connecting tube is slidingly connected to the upper end of the fixing tube, a baffle is provided at the lower end of the connecting tube, a second spring is passed through the portion between the baffle of the connecting tube and the upper end of the fixing tube, and the second spring makes the lower end of the shaft shoulder close to the outer wall of the upper end of the fixing tube.

[0011] Furthermore, the retaining spring mechanism includes a guide tube and a telescopic rod. The guide tube is fixed in the fixed tube. The telescopic rod includes two rods, which are slidably connected to the two ends of the guide tube respectively. A limit plate is provided on the telescopic rod. A third spring is provided between the limit plates of the two telescopic rods. Under the action of the third spring, the outer ends of the two telescopic rods pass through the through holes on both sides of the fixed tube and make the limit plates contact the inner wall of the fixed tube; the lower end of the connecting tube is provided with two pull ropes, which pass through the guide tube respectively and are connected to the inner ends of the two telescopic rods. When the connecting tube moves upward, the two telescopic rods can be driven to move toward each other by the pull ropes.

[0012] Furthermore, two rollers are provided in the middle of the guide tube, and two pull ropes are respectively passed around one roller and connected to the inner end of the telescopic rod; the length of the guide tube is sufficient so that when the limit plate on the telescopic rod contacts the end of the guide tube, the outer end of the telescopic rod is not completely retracted into the fixed tube.

[0013] Furthermore, a drilling monitoring mechanism is provided at the lower end of the fixing mechanism, and the drilling monitoring mechanism includes a tempered glass tube and a monitor arranged in the tempered glass tube. The tempered glass tube is detachably connected to the lower end of the fixing mechanism, and the upper end of the core sampling tube is detachably connected to the lower end of the tempered glass tube.

[0014] Furthermore, a fixed seat is provided at the lower end of the tempered glass tube, and a motor is provided at the upper end of the tempered glass tube. The lower end of the monitor is rotatably connected to the fixed seat through a rotating shaft, and the upper end of the monitor is fixedly connected to the rotating shaft of the motor, and the rotating shaft and the rotating shaft of the motor are coaxial with the axis of the monitor.

[0015] The beneficial effects of the present invention are:

[0016] 1. By installing a water flow disperser on the traditional fish trap, the high-pressure water sprayed by the water flow disperser can be used to push the entire coring mechanism to move within the drill pipe during coring, thereby moving the coring mechanism to the bottom of the hole during horizontal drilling or directional drilling, realizing the coring-while-drilling function and improving the coring efficiency;

[0017] 2. The flexible coring tube is composed of a flexible spring tube and a wear-resistant flexible wrapping layer. It has a certain rigidity and elasticity and can bend and deform with the directional drilling of the directional drill pipe, thus meeting the requirements of directional coring and ensuring the integrity of the coring;

[0018] 3. By setting a conical fishing head at the upper end of the connecting tube and a slidable inverted conical movable cap in the middle of the connecting tube, the elastic locking tongue of the fish trap can be respectively stuck on the fishing head or the movable conical cap under the action of the water flow disperser, thereby realizing the engagement and disengagement of the fish trap with the fixing mechanism, and preventing the fish trap from affecting the coring mechanism while drilling.

[0019] 4. The connecting tube connecting the fishing head is movably connected to the fixing mechanism, and the connecting tube is connected to the telescopic rod of the retaining spring mechanism by a pull rope. When the entire coring mechanism is retracted by the fishing device, the retaining spring mechanism can be disengaged from the drill pipe, which can simplify the retaining spring mechanism and make the entire recovery process smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the fish trap of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the fixing mechanism of the present invention.

[0023] The following are marked in the figure: 1-fishing device, 2-fixing mechanism, 3-coring tube, 4-water flow disperser, 5-while-drilling monitoring mechanism, 6-cable, 11-fishing tube, 12-elastic locking tongue, 13-mounting hole, 14-bolt, 15-positioning plate, 16-nut, 17-first spring, 21-fishing head, 22-circlip mechanism, 23-connecting tube, 24-movable conical cap, 25-fixing tube, 26-second spring, 27-roller, 31-flexible spring tube, 32-wear-resistant flexible wrapping layer, 33-top casing, 34-bottom casing, 41-fishing rope tube, 42-water inlet pipe, 43-water outlet pipe, 51-tempered glass tube, 52-monitor, 53-fixing seat, 54-motor, 55-rotating shaft, 221- Guide tube, 222- telescopic rod, 223- limit plate, 224- third spring, 225- pull rope, 231- shoulder, 232- baffle. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] It should be noted that if directional terms are used in this disclosure, such as "up," "down," "left," "right," "forward," and "backward," these are intended to facilitate the description of the relative positions of components and are not intended to specify the absolute positions of the components or the positional relationships between them. They are used only to explain the relative positions and movement of components in a specific posture. If the posture changes, the directional terms will change accordingly. If terms referring to quantity are used in this disclosure, such as "plurality," "multiple," and "several," these specifically refer to two or more.

[0026] like Figure 1-3 As shown, the present invention provides a flexible rope coring mechanism for directional drilling, including a fisher 1, a fixing mechanism 2 and a coring tube 3. The upper end of the fixing mechanism 2 is provided with a fisher head 21 that can be docked with the fisher 1, and the middle part of the fixing mechanism 2 is provided with a retaining spring mechanism 22 that can be clamped with the drill rod. The coring tube 3 is arranged at the lower end of the fixing mechanism 2. The upper end of the fisher 1 is provided with a water flow disperser 4. The upper end of the water flow disperser 4 is connected with a salvaging rope tube 41. The water flow disperser 4 is provided with an inlet pipe 42 connected to the salvaging rope tube 41. The periphery of the water flow disperser 4 is provided with a water outlet pipe 43 connected to the water inlet pipe 42, and the water outlet direction of the outlet pipe 43 is toward the top or obliquely above the water flow disperser 4; the coring tube 3 is a flexible coring tube, including a flexible spring tube 31 formed by winding a metal strip along a spiral structure, and a wear-resistant flexible wrapping layer 32 coated on the inner and outer walls of the flexible spring tube 31.

[0027] The salvaging rope tube 41 is preferably a metal-clad hose, exhibiting sufficient flexibility and tensile strength to meet the requirements for high-pressure water flow and function as a rope-lifting coring mechanism. The water disperser 4 and its internal inlet pipe 42 and outlet pipe 43 can be integrally molded from metal or plastic to ensure structural strength. The salvaging rope tube 41 connects to the inlet pipe 42 of the water disperser 4 via a threaded joint, while the water disperser 4 connects to the catcher 1 via threads or bolts. The flexible spring tube 31 of the coring tube 3 is similar in structure to a conventional spring, requiring the appropriate material to be selected based on the strength requirements of the coring process, ensuring that it can bend to a certain degree while maintaining a certain degree of rigidity to prevent collapse and deformation during the coring process. The wear-resistant flexible wrapping layer 32 can be made of a composite material formed by natural rubber or a polymer material such as rubber and polyurethane. Its purpose is to fill the gaps between the spiral structures of the flexible spring tube 31 to form a smooth round tube, thereby preventing the core material in the core tube from flowing out. At the same time, it can also deform with the deformation of the flexible spring tube 31 and protect the metal flexible spring tube 31. In addition, a top sleeve 33 with an internal thread can be welded to the upper end of the core tube 3. The core tube 3 is connected to the threaded interface at the lower end of the fixing mechanism 2 through the top sleeve 33. A bottom sleeve 34 can be welded to the lower end of the core tube 3 to facilitate docking with the core port of the drill pipe, so that the core can smoothly enter the core tube 3.

[0028] The use process of the present invention is as follows: taking directional drilling coring as an example, first connect the fishing rope tube 41 connected to the water flow disperser 4 to the high-pressure water pump; then clamp and fix the fish catcher 1 to the fishing head 21, and then lower the entire coring mechanism along the drill pipe. When the coring mechanism is unable to be lowered naturally due to the resistance of groundwater or curved borehole, start the high-pressure water pump, and use the high-pressure water flow discharged from the outlet pipe 42 of the water flow disperser 4 to push the coring mechanism forward, so that the coring tube 3 moves gradually toward the bottom of the borehole in a curved form until the retaining spring mechanism 22 of the fixing mechanism 2 is connected with the retaining spring mechanism on the drill pipe. The coring mechanism is moved into position by comparing the length of the lowered salvage rope tube 41 with the depth of the drill hole and the movement of the salvage rope tube 41 under the push of the water flow disperser 4. Finally, the drill bit at the end of the drill pipe is started to carry out the coring work of directional drilling. During this period, the coring tube 3 will bend with the bending of the directional drill pipe to ensure the integrity of the coring. After the coring is completed, the coring mechanism is pulled upward by the salvage rope tube 41 to disengage the retaining spring mechanism 22 from the bayonet of the drill pipe until the coring mechanism is taken out, thereby completing the coring work of the directional drilling.

[0029] To disperse the high-pressure water ejected by the water disperser 4 more evenly, the water inlet pipe 42 of the water disperser 4 can be arranged along its axis, and the water outlet pipes 43 include at least two and are arranged rotationally symmetrically around the axis of the water inlet pipe 42. This can make the force applied to the water disperser 4 more uniform, which is conducive to improving the smooth operation of the equipment.

[0030] Because the salvage rope tube 41 is different from ordinary ropes, it is heavier and less flexible than a rope. If it is always connected to the coring mechanism during the drilling and coring process, it may affect the movement of the coring mechanism along with the directional drill pipe. In serious cases, it may cause the retaining spring mechanism 22 to disengage from the drill pipe bayonet. Therefore, it is best to disengage the salvage rope tube 41 from the coring mechanism during the drilling process. To achieve this function, the preferred solution of the present invention is that the lower end of the fishing device 1 is provided with an elastic locking tongue 12 that can be engaged with the fishing head 21, and the fishing head 21 is arranged at the upper end of the fixing mechanism 2 through a connecting tube 23, and a movable conical cap 24 is slidably provided on the connecting tube 23, and the movable conical cap 24 and the fishing head 21 are both frustum-shaped structures, wherein the conical surface of the fishing head 21 faces upward, and the conical surface of the movable conical cap 24 faces downward, and the outer diameter of the large end of the movable conical cap 24 is larger than the outer diameter of the large end of the fishing head 21, and a shaft shoulder 231 is provided in the middle part of the connecting tube 23, and the movable conical cap 24 contacts the upper end of the shaft shoulder 231 under the action of gravity, so that space for the elastic locking tongue 12 to be engaged is left between the movable conical cap 24 and the fishing head 21, and between the movable conical cap 24 and the top of the fixing mechanism 2.

[0031] The process of engaging and disengaging the fishing device 1 and the fishing head 21 is as follows: when lowering the equipment, the elastic locking tongue 12 is engaged on the fishing head 21. When the water flow disperser 4 is used to push the equipment forward, the elastic locking tongue 12 may be engaged under the movable conical cap 24 under the action of the thrust and contact the upper end of the fixing mechanism 2, thereby pushing the fixing mechanism 2 forward until the retaining spring mechanism 22 is engaged with the drill pipe. When coring is required, the salvage rope tube 41 is pulled upward, and the movable conical cap 24 will first move upward with the elastic locking tongue 12 until it contacts the fishing head 21. At this time, the pulling force is continued to be increased, and the elastic locking tongue 12 will shrink inwardly under the cone surface of the movable conical cap 24. Since the outer diameter of the large end of the movable conical cap 24 is larger than the outer diameter of the large end of the fishing head 21, when the elastic locking tongue 12 is separated from the movable conical cap 24, it will also be separated from the fishing head 21; if resistance is encountered when the salvage rope tube 41 is pulled upward, it indicates that the elastic locking tongue 12 did not get stuck under the movable conical cap 24 when the equipment was lowered, but was still stuck on the fishing head 21. Since the fixing mechanism 2 is already in place at this time, the water flow disperser 4 can be used to increase the thrust to make the elastic locking tongue 12 get stuck under the movable conical cap 24, and then the above process is used to realize the separation of the fisher 1 and the fishing head 21, thereby ensuring that the salvage rope tube 41 will not affect the coring process. After coring is completed, it is necessary to re-engage the fisher 1 and the fishing head 21 to recover the equipment, and similarly use the water flow disperser 4 to push the fisher 1 forward. At this time, it is necessary to focus on controlling the thrust so that the elastic locking tongue 12 can overcome the elastic force and be stuck under the fishing head 21, rather than under the movable conical cap 24. Because the conical surface of the fishing head 21 faces upward, the conical surface of the movable conical cap 24 faces downward, and the outer diameter of the large end of the movable conical cap 24 is larger than the outer diameter of the large end of the fishing head 21, the elastic force that the elastic locking tongue 12 needs to overcome to be stuck under the fishing head 21 will be smaller than the elastic force to be stuck under the movable conical cap 24. Therefore, the required elastic force of the two can be obtained in advance through experiments, and the thrust of the water flow disperser 4 can be controlled to ensure that the elastic locking tongue 12 is only stuck under the fishing head 21. At this time, the equipment can be recovered through the salvage rope tube 41.

[0032] Regarding the specific structure of the fishing device 1 and the elastic locking tongue 12, as shown in FIG. Figure 2As shown, the fish trap 1 includes a fish tube 11, with a mounting hole 13 defined at the lower end of the fish tube 11. The axis of the mounting hole 13 is perpendicular to the axis of the fish trap 1. An elastic locking tongue 12 is slidably disposed within the mounting hole 13. A bevel is defined below one end of the elastic locking tongue 12, near the center of the fish trap 1. A bolt 14 is provided at the other end. The bolt 14 passes through a positioning piece 15 at the outer end of the mounting hole 13, i.e., near the outside of the fish tube 11, and is connected to a nut 16. A first spring 17 is sleeved onto the bolt 14. In its natural state, the bevel of the elastic locking tongue 12 extends beyond the inner end of the mounting hole 13 under the action of the first spring 17. When the bevel of the elastic locking tongue 12 is pushed by the fish head 21 and the movable conical cap 24, it compresses the first spring 17 and moves it into the mounting hole 13. The inner diameter of the fish tube 11 should be larger than the outer diameter of the larger end of the movable conical cap 24 to prevent interference between the elastic locking tongue 12 and the fish head 21 and the movable conical cap 24. In order to achieve stable engagement between the fishing device 1 and the fishing head 21 , the elastic locking tongues 12 should include at least two and be rotationally symmetrically arranged around the axis of the fishing tube 11 .

[0033] Preferably, the fixing mechanism 2 includes a fixing tube 25, the upper end surface of which is provided with a through hole, the size of which is comparable to the outer diameter of the connecting tube 23, the lower end of the connecting tube 23 passing through the through hole and slidingly connected to the fixing tube 25, the lower end of the connecting tube 23 being provided with a baffle 232, the portion between the baffle 232 of the connecting tube 23 and the upper end of the fixing tube 25 being passed through by a second spring 26, the second spring 26 causing the lower end of the shaft shoulder 231 to cling to the outer wall of the upper end of the fixing tube 25. The provision of the second spring 26 can act as a buffer when the recovery equipment pulls the salvage rope tube 41 upward, thereby preventing damage to the equipment due to excessive force.

[0034] Regarding the spring mechanism 22, there are many structural forms in the current rope coring mechanism. In order to cooperate with the connecting pipe 23, the present invention provides an embodiment, such as Figure 3As shown, the retaining spring mechanism 22 includes a guide tube 221 and a telescopic rod 222. The guide tube 221 is fixed in the fixed tube 25. The telescopic rod 222 includes two, which are slidably connected to the two ends of the guide tube 221 respectively. A limit plate 223 is provided on the telescopic rod 222. A third spring 224 is provided between the limit plates 223 of the two telescopic rods 222. Under the action of the third spring 224, the outer ends of the two telescopic rods 222 pass through the through holes on both sides of the fixed tube 25, and make the limit plates 223 contact the inner wall of the fixed tube 25; the lower end of the connecting tube 23 is provided with two pull ropes 225, which pass through the guide tube 221 respectively and are connected to the inner ends of the two telescopic rods 222. When the connecting tube 23 moves upward, the pull ropes 225 can drive the two telescopic rods 222 to move toward each other. During the lowering of the coring mechanism, the two telescopic rods 222 are compressed until they reach the snap-in position of the drill pipe, at which point the telescopic rods 222 pop out and engage the snap-in position, securing the coring mechanism to the drill pipe. After coring is completed, when the salvage rope tube 41 is pulled upward, the telescopic rods 222 retract inward under the action of the connecting tube 23, disengaging the snap-in position of the drill pipe. To facilitate smoother movement of the pull ropes 225, two rollers 27 are provided in the middle of the guide tube 221. Each pull rope 225 passes around one roller 27 and then connects to the inner end of the telescopic rods 222. The length of the guide tube 221 is such that when the stop plate 223 on the telescopic rod 222 contacts the end of the guide tube 221, the outer end of the telescopic rod 222 does not fully retract into the fixing tube 25. This ensures that the telescopic rod 222 remains in contact with the through hole of the fixing tube 25 after disengaging from the snap-in position of the drill pipe, preventing it from becoming stuck in the through hole. In addition, when selecting the elastic force of the first spring 17, the second spring 26 and the third spring 224, it should be ensured that when the salvage rope tube 41 is pulled up, the elastic locking tongue 12 will not drive the connecting tube 23 to move when sliding on the movable conical cap 24, and ensure that when the fisher 1 is separated from the fishing head 21, the retaining spring mechanism 22 will not be separated from the bayonet of the drill pipe.

[0035] In addition, to facilitate observation of the coring mechanism's operation while drilling, a while-drilling monitoring mechanism 5 is provided at the lower end of the fixing mechanism 2. This monitoring mechanism 5 comprises a tempered glass tube 51 and a monitor 52 disposed within the tube. The tempered glass tube 51 is detachably connected to the lower end of the fixing mechanism 2, while the upper end of the coring tube 3 is detachably connected to the lower end of the tempered glass tube 51. Both connections utilize the same threaded connection, allowing the coring tube 3 to be connected to the fixing mechanism 2 even without the while-drilling monitoring mechanism 5. The while-drilling monitoring mechanism 5 can have its own power supply or receive external power via a cable 6. The monitor 52 can include a spatial positioning device, an image acquisition device, and a wave velocity measurement device. The spatial positioning device, which includes a gyroscope, an accelerometer, and a magnetoresistive sensor, is primarily used to locate the while-drilling monitoring mechanism and, therefore, to measure the directional drilling trajectory. The image acquisition device includes a camera for capturing information about the borehole. The wave velocity measurement device includes an acoustic wave detection device for capturing wave velocity information about the borehole. Furthermore, to achieve 360-degree information collection, a fixing base 53 is provided at the lower end of the tempered glass tube 51, and a motor 54 is provided at the upper end. The lower end of the monitor 52 is rotatably connected to the fixing base 53 via a rotating shaft 55, and the upper end of the monitor 52 is fixedly connected to the rotating shaft of the motor 54. The rotating shaft 55 and the rotating shaft of the motor 54 are coaxial with the axis of the monitor 52. The motor 54 drives the monitor 52 to rotate, thereby synchronously collecting images and sound waves in a 360-degree direction of the borehole, providing more information for directional drilling coring operations.

Claims

1. A flexible rope coring mechanism for directional drilling, comprising a fishing device (1), a fixing mechanism (2) and a coring tube (3), wherein the upper end of the fixing mechanism (2) is provided with a fishing head (21) capable of docking with the fishing device (1), the middle portion of the fixing mechanism (2) is provided with a retaining spring mechanism (22) capable of being clamped with a drill rod, and the coring tube (3) is arranged at the lower end of the fixing mechanism (2), characterized in that: The upper end of the fish catcher (1) is provided with a water flow disperser (4), the upper end of the water flow disperser (4) is connected to a salvaging rope tube (41), a water inlet pipe (42) connected to the salvaging rope tube (41) is provided in the water flow disperser (4), and a water outlet pipe (43) connected to the water inlet pipe (42) is provided around the water flow disperser (4), and the water outlet direction of the water outlet pipe (43) is toward the upper part or obliquely upward of the water flow disperser (4); the core tube (3) is a flexible core tube, including a flexible spring tube (31) formed by winding a metal strip along a spiral structure, and a wear-resistant flexible wrapping layer (32) coated on the inner and outer walls of the flexible spring tube (31); the lower end of the fish catcher (1) is provided with an elastic locking tongue (12) that can be engaged with the fishing head (21), and the fish catcher (21) is provided with a plurality of elastic locking tongues (12) connected to the fishing head (21). The fishing head (21) is arranged at the upper end of the fixing mechanism (2) through a connecting tube (23), and a movable conical cap (24) is slidably arranged on the connecting tube (23). The movable conical cap (24) and the fishing head (21) are both frustum-shaped structures, wherein the conical surface of the fishing head (21) faces upward, and the conical surface of the movable conical cap (24) faces downward, and the outer diameter of the large end of the movable conical cap (24) is larger than the outer diameter of the large end of the fishing head (21). A shaft shoulder (231) is provided in the middle of the connecting tube (23), and the movable conical cap (24) contacts the upper end of the shaft shoulder (231) under the action of gravity, so that space for the elastic locking tongue (12) to be engaged is reserved between the movable conical cap (24) and the fishing head (21), and between the movable conical cap (24) and the top of the fixing mechanism (2).

2. The flexible wireline coring mechanism for directional drilling according to claim 1, wherein: The water inlet pipe (42) of the water flow disperser (4) is arranged along its axial direction, and the water outlet pipes (43) include at least two and are arranged rotationally symmetrically around the axis of the water inlet pipe (42).

3. The flexible wireline coring mechanism for directional drilling according to claim 1, wherein: The fish catcher (1) includes a fish catcher tube (11), a mounting hole (13) is provided at the lower end of the fish catcher tube (11), the axis of the mounting hole (13) is perpendicular to the axis of the fish catcher (1), the elastic locking tongue (12) is slidably arranged in the mounting hole (13), an inclined surface is provided below one end of the elastic locking tongue (12) close to the middle of the fish catcher (1), and a bolt (14) is provided at the other end, the bolt (14) passes through a positioning piece (15) at the outer end of the mounting hole (13) and is connected to a nut (16), and a first spring (17) is sleeved on the bolt (14).

4. The flexible rope coring mechanism for directional drilling according to claim 3, wherein: The elastic locking tongues (12) include at least two and are arranged rotationally symmetrically around the axis of the fishing tube (11).

5. The flexible wireline coring mechanism for directional drilling according to claim 1, wherein: The fixing mechanism (2) includes a fixing tube (25), the lower end of the connecting tube (23) is slidably connected to the upper end of the fixing tube (25), the lower end of the connecting tube (23) is provided with a baffle (232), a second spring (26) is connected between the baffle (232) of the connecting tube (23) and the upper end of the fixing tube (25), and the second spring (26) makes the lower end of the shaft shoulder (231) close to the outer wall of the upper end of the fixing tube (25).

6. The flexible wireline coring mechanism for directional drilling according to claim 5, characterized in that: The spring mechanism (22) includes a guide tube (221) and a telescopic rod (222). The guide tube (221) is fixed in the fixed tube (25). The telescopic rod (222) includes two, which are respectively slidably connected to the two ends of the guide tube (221). A limit plate (223) is provided on the telescopic rod (222). A third spring (224) is provided between the limit plates (223) of the two telescopic rods (222). Under the action of the third spring (224), the two telescopic rods (222) are The outer ends of the retractable rods (222) pass through the through holes on both sides of the fixed tube (25), and the limiting plates (223) contact the inner wall of the fixed tube (25); the lower end of the connecting tube (23) is provided with two pull ropes (225), and the two pull ropes (225) respectively pass through the guide tubes (221) and are connected to the inner ends of the two telescopic rods (222). When the connecting tube (23) moves upward, the pull ropes (225) can drive the two telescopic rods (222) to move toward each other.

7. The flexible wireline coring mechanism for directional drilling according to claim 6, wherein: Two rollers (27) are provided in the middle of the guide tube (221), and two pull ropes (225) are respectively passed around one roller (27) and connected to the inner end of the telescopic rod (222); the length of the guide tube (221) is such that when the limit plate (223) on the telescopic rod (222) contacts the end of the guide tube (221), the outer end of the telescopic rod (222) is not completely retracted into the fixed tube (25).

8. The flexible rope coring mechanism for directional drilling according to any one of claims 1 to 7, characterized in that: A drilling monitoring mechanism (5) is further provided at the lower end of the fixing mechanism (2). The drilling monitoring mechanism (5) comprises a tempered glass tube (51) and a monitor (52) disposed within the tempered glass tube (51). The tempered glass tube (51) is detachably connected to the lower end of the fixing mechanism (2), and the upper end of the coring tube (3) is detachably connected to the lower end of the tempered glass tube (51).

9. The flexible wireline coring mechanism for directional drilling according to claim 8, characterized in that: The lower end of the tempered glass tube (51) is provided with a fixing seat (53), and the upper end of the tempered glass tube (51) is provided with a motor (54). The lower end of the monitor (52) is rotatably connected to the fixing seat (53) via a rotating shaft (55), and the upper end of the monitor (52) is fixedly connected to the rotating shaft of the motor (54), and the rotating shaft (55) and the rotating shaft of the motor (54) are coaxial with the axis of the monitor (52).

Images