Centralizer for Horizontal Borehole Logging in Deep Geological Disposal Site Investigation and Method for Inserting Logging Sensors Using the Same

Abstract

The present invention relates to a logging centralizer for a horizontal borehole and a method for sensor entry using the same, for transporting and retrieving a well logging sensor aligned with the borehole's central axis to a target depth within the horizontal borehole. More specifically, the present invention relates to an automated transport system and a method of operation thereof, configured to sequentially connect and disconnect a sensor guide equipped with a logging sensor and a plurality of pipes, and to precisely transport a pipe assembly into the borehole through a roller drive method that engages with continuous protrusions on the outer surface of the pipes.

Description

Technology Field

[0001] The present invention relates to a logging centralizer for a horizontal borehole and a method for sensor entry using the same, for transporting and recovering a well logging sensor to a target depth while aligning the sensor with the center axis of the well within the horizontal borehole.

[0002] More specifically, the present invention relates to an automated transfer system and a method of operation thereof, configured to sequentially connect and disconnect a plurality of pipes using a sensor guide equipped with a logging sensor, and to precisely transfer a pipe assembly into a ball through a roller drive method that engages with continuous protrusions on the outer surface of the pipes. Background Technology

[0004] Well logging is a technique for analyzing the physical properties of geological layers by inserting measurement sensors, such as those for electrical resistivity, sound waves, density, and natural gamma, into a borehole to measure physical signals reflected and propagated from the layers. This well logging technique is widely utilized in various civil engineering and resource fields, including site characterization for the Deep Geological Repository (DGR), exploration of underground resources, ground surveys, groundwater observation, evaluation of nuclear power plant sites, and evaluation of ground characteristics for tunnel and dam construction.

[0005] To ensure measurement precision in geophysical logging, it is crucial that the sensor moves while consistently aligned with the borehole's central axis without touching the inner wall. To achieve this, a centralizer is used; this is an auxiliary device attached to the top and bottom of the sensor to position it in the center of the borehole.

[0006] As prior art, Korean Published Patent Application No. 10-2025-0143604 (Title: Centralizer for physical logging with size adjustable to fit the bore) discloses a centralizer comprising a lower fixing ring fixedly coupled to the lower part of a sonde, an upper coupling ring installed at the upper part so as to be movable along the longitudinal direction of the sonde, a bow spring which is an elastic body disposed between the upper and lower rings and bends outward as the upper coupling ring descends, and a scale bar and a fixing pin that indicate the degree of opening of the bow spring according to the upper and lower positions of the upper coupling ring.

[0007] However, the aforementioned prior art focuses technically only on increasing the convenience of single-person operation by quantifying the amount of spread of the bow rod according to the diameter of the borehole using a scale, and is based on the premise of a vertical borehole where the sonde naturally descends in the direction of gravity. In other words, the prior art fails to provide a separate technical solution for horizontal boreholes and leaves intact the fundamental limitation that natural transport of the sensor by gravity is impossible in horizontal boreholes.

[0008] Meanwhile, as prior art regarding the winding and unwinding of sensors and sensor cables, Korean Registered Patent Publication No. 10-1311208 (Title: Winch System for Retrieving Sensor Cable for Borehole Exploration) discloses a winch system comprising a motor that generates rotational driving force, a drum that rotates horizontally by the motor and winds the cable, a guide body that supports the drum, and a foreign matter removal unit formed inside the guide body to remove foreign matter attached to the cable and electrode.

[0009] The above winch system is useful for preventing electrode damage and removing foreign matter attached to the cable when winding a sensor cable equipped with multiple electrodes onto a drum and pulling it up, but it has fundamental limitations in that (i) the movement of the sensor within the borehole depends on cable tension and gravity, and (ii) in horizontal boreholes, the sensor cannot be advanced to the target depth solely by cable tension.

[0010] In summary, conventional centralizers (Patent No. 10-2025-0143604) are specialized for aligning the central axis of a sonde in vertical boreholes, and conventional winch systems (Patent No. 10-1311208) are specialized for retrieving cables in vertical boreholes; therefore, both technologies are difficult to apply directly to horizontal boreholes where gravity cannot be assisted.

[0011] Horizontal boreholes are wells drilled parallel to the surface. Their importance is increasing in areas such as site characterization for low- and high-level radioactive waste disposal facilities, observation of ground behavior around nuclear power plants, ground investigation adjacent to tunnels and underground structures, and resource development based on horizontal wells; however, there are the following technical challenges.

[0012] First, since natural descent by gravity is impossible, a separate propulsion means is required to push the sensor and sensor assembly horizontally.

[0013] Second, to reach sensors into horizontal boreholes ranging from tens to hundreds of meters, multiple rigid pipes must be continuously connected and extended; this process conventionally relied on manual labor, resulting in low safety and efficiency.

[0014] Third, since the separation of the pipe connection within the hole leads to a serious accident in which the sensor assembly is lost, a robust and automated connection and disconnection mechanism is required.

[0015] Fourth, in a horizontal borehole, since the pipe comes into continuous contact with the inner wall of the borehole, structures such as wheels are required to minimize frictional resistance, and at the same time, a design is required to ensure that these wheels do not interfere with the propulsion device (roller) on the ground.

[0016] Fifth, since the data transmission wire connected to the sensor must pass through all extended pipes, structural considerations are required to prevent the wire from being pinched or damaged during the connection process between pipes. Prior art literature

[0018] (1) Korean Published Patent Application No. 10-2025-0143604 (Published Oct. 02, 2025) - Centralizer for physical logging with size adjustable to fit the borehole diameter (2) Korean Registered Patent Application No. 10-1311208 (Registered Sep. 16, 2013) - Winch system for recovering sensor cables for borehole exploration The problem to be solved

[0019] The present invention aims to solve the aforementioned problems, and the first objective of the present invention is to provide a centralizer capable of actively propelling a sensor assembly to a target depth while aligned with the central axis of the borehole in a horizontal borehole where gravity propulsion is impossible, and a method for entering a logging sensor using the same.

[0020] The second objective of the present invention is to provide a centralizer equipped with a magnetic pin fastening mechanism capable of automatically fastening and unfastening a plurality of pipes sequentially without worker intervention, and a method for entering a logging sensor using the same.

[0021] The third objective of the present invention is to provide a centralizer capable of movement while minimizing friction through pipe wheels, and a method for entering a logging sensor using the same, while enabling slip-free precision transfer through a meshing drive method of pipe protrusions and roller protrusions.

[0022] The fourth objective of the present invention is to provide a centralizer equipped with an automatic pipe supply system that automates the entire process from pipe storage to supply to a connection position, and a method for entering a logging sensor using the same. means of solving the problem

[0024] The logging centralizer for a horizontal borehole according to the present invention for achieving the above objective comprises: a sensor guide having a logging sensor mounted inside and a first protrusion formed on the outer surface having a first pinhole drilled therein, the sensor guide having a logging sensor mounted inside; a wire connected to the sensor or sensor guide, wound onto a winding roll, and having its winding and unwinding controlled by a rotary motor; a pipe having an opening formed on the side to allow the wire to pass through and be arranged in the longitudinal direction, a groove formed at one end into which the first protrusion is inserted and a second pinhole formed therein, a second protrusion and a third pinhole formed at the other end having the same structure as the first protrusion and the second pinhole, a continuous projection formed on the outer surface, and a wheel mounted at the bottom; and a pin inserted into the first and second pinholes or the second and third pinholes to connect the sensor guide and the pipe or between the pipes. The roller moving unit comprises: a roller having a corresponding projection that engages with a projection on the outer surface of the pipe to be driven in the longitudinal direction of the pipe to move the pipe back and forth; and a moving part on which the roller is mounted and which drives the corresponding projection of the roller to engage or disengage with a continuous projection of the pipe.

[0025] And the moving part comprises a base part spaced apart from the side of the pipe, a moving rod mounted on the base part and moving back and forth toward the side of the pipe, and an adapter mounted on the tip of the moving rod and having mounting surfaces formed at the top and bottom for installing the roller.

[0026] At this time, it is preferable that the pipe has a square cross-section with corners arranged in vertical and horizontal directions, and that the wheels are mounted on the two lower surfaces of the pipe to separate the pipe from the ground.

[0027] Additionally, it may further include a pin fastening rod that grips the pin by magnetic force and inserts it into the first and second pin holes, and in this embodiment, it may further include a pin table that is positioned on the movement path of the pipe to minimize the movement path of the pin fastening rod and accommodates a plurality of pins on its upper surface.

[0028] Meanwhile, the present invention may further include a pipe storage table for storing a plurality of pipes in alignment as an automatic pipe supply unit; a pipe left / right mover for moving the pipes of the pipe storage table by pushing them left and right; and a pipe up / down mover for raising the pipes of the up / down mover table to a fastening position, provided that the pipes moved left / right are positioned on the pipe up / down mover table.

[0029] In addition, an opening is formed at the top of the pipe, and a wire can be inserted through the opening of the pipe by raising the pipe in the pipe up / down moving device.

[0030] Meanwhile, the method for entering a horizontal borehole logging sensor according to the present invention for achieving the above-mentioned purpose is a sensor entry method using a logging centralizer for a horizontal borehole, comprising: (a) a step of mounting a sensor inside a sensor guide and connecting a wire to the rear of the sensor or the sensor guide; (b) a step of passing the wire through a first pipe and inserting a first protrusion formed on the sensor guide into a groove of the pipe; (c) a step of connecting the sensor guide and the pipe by magnetically gripping a pin with a pin and inserting it into a first pin hole of the sensor guide and a second pin hole of the pipe; (d) a step of driving the roller with a corresponding protrusion of the roller engaged with a continuous protrusion on the outer surface of the pipe to advance the pipe together with the sensor and the sensor guide; (e) a step of passing the wire through a second pipe and inserting a second protrusion formed on the first pipe into a groove of the second pipe; (f) a step of connecting the two pipes by magnetically gripping a pin with a pin and inserting it into a second pin hole of the first pipe and a third pin hole of the second pipe; (g) a step of driving the roller to advance the pipe while engaging the corresponding projection of the roller with the continuous projection on the outer surface of the pipe; and (h) a step of repeating steps (f) and (g) to advance the sensor to a target depth;

[0031] At this time, the method further comprises: (i) a step of moving a pipe on a pipe storage table in which a plurality of pipes are aligned and stored by pushing it left and right; (j) a step in which, when a third pipe is placed on a pipe vertical moving table by the left and right movement, the pipe vertical moving table is raised to move the third pipe to a fastening position and pass a wire through it; and (k) a step of driving the roller in the reverse direction to insert a second protrusion formed on the second pipe into a groove of the third pipe; and in step (h), it is preferable to repeat steps (i), (j), (k), (f), and (g). Effects of the invention

[0033] According to the logging centralizer for a horizontal borehole and the method for entering a logging sensor using the same according to the present invention, since the sensor assembly can be actively propelled within the horizontal borehole without the aid of gravity, there is an advantage in being able to pioneer a horizontal borehole logging area that was inaccessible with conventional technology.

[0034] And according to the present invention, unmanned automatic fastening is possible through the optimal arrangement of the magnetic pin fastening rod and the pin table, which has the effect of dramatically improving worker safety and efficiency.

[0035] In addition, according to the present invention, there is an advantage that precise distance control without slip is possible through the meshing drive of the pipe projection and the roller corresponding projection.

[0036] Furthermore, according to the present invention, there is an advantage in that the propulsion force on the pipe can be maximized while avoiding wheel-roller interference through the wheel structure at the bottom of the pipe and the forward and backward movement mechanism of the roller moving part.

[0037] In addition, according to the present invention, continuous unmanned operation is possible even in long-distance horizontal boreholes through an automatic feeding unit composed of a pipe storage table, a left-right mover, and an up-down mover. Brief explanation of the drawing

[0039] FIG. 1 is a perspective view illustrating the configuration of a logging centralizer for a horizontal borehole according to the present invention. FIG. 2 is a perspective view illustrating the combined relationship of a sensor, a sensor guide, and a wire according to the present invention. FIG. 3 is a perspective view illustrating a wire, a winding roll, and a rotary motor according to the present invention. FIG. 4 is a perspective view illustrating the combined relationship of a sensor guide, a wire, and a pipe according to the present invention. FIG. 5 is a perspective view illustrating an opening formed in a pipe according to the present invention. FIG. 6 is a perspective view illustrating the arrangement relationship of a roller moving unit for a pipe according to the present invention. FIG. 7 is a cross-sectional view of FIG. 6, FIG. 8 is a perspective view illustrating a pin fastening hole and a pin table according to the present invention. FIG. 9 is a perspective view illustrating the configuration of an automatic pipe supply unit according to the present invention. FIG. 10 is a flowchart illustrating a method for entering a horizontal borehole logging sensor according to the present invention. FIG. 11 is a perspective view illustrating the process of mounting a sensor guide and a wire onto a pipe. FIG. 12 is a perspective view illustrating the operational relationship of a roller moving unit with respect to a pipe, FIG. 13 is a perspective view illustrating the process of connecting pipes to each other with pins. FIG. 14 is a perspective view illustrating the state in which a pipe is inserted into a horizontal borehole. FIG. 15 is a perspective view illustrating the process of supplying a pipe in an automatic pipe supply unit. Specific details for implementing the invention

[0040] Hereinafter, the configuration and operation method according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0042] First, a logging centralizer for a horizontal borehole according to the present invention will be described.

[0043] FIG. 1 is a perspective view illustrating the configuration of a logging centralizer for a horizontal borehole according to the present invention.

[0044] As described above, a logging centralizer for a horizontal borehole according to one embodiment of the present invention is largely composed of a sensor guide (20), a wire (30) and a winding drive unit, a pipe (40), a pin (50) and a pin fastening rod (70), a roller moving unit (60), and an automatic pipe supply unit (90).

[0045] The sensor guide (20) is a tubular or rod-shaped structure in which a sensor (10) for logging (e.g., electrical resistivity sensor, acoustic sensor, density sensor, natural gamma sensor, etc.) is mounted inside, as shown in FIG. 2 (a), and is designed to have an outer diameter slightly smaller than the inner diameter of the horizontal borehole (B) so as to maintain central axis alignment while spaced apart from the inner wall of the borehole.

[0046] A first protrusion (21) for connection with a subsequent pipe (40) is formed on one end of the outer surface of the sensor guide (20). A first pin hole (22) is drilled perpendicular to the longitudinal direction in the first protrusion (21), and the connection with the pipe (40) is completed by a pin (50) described later. The first protrusion (21) is shaped to be slidably inserted into a groove (42) of the pipe (40), and can preferably be formed in a plate shape.

[0047] As shown in FIG. 2(b), the wire (30) is connected to the rear of the sensor (10) or sensor guide (20) to transmit measurement data to the ground, and at the same time functions as a means to assist in tracking the position and retrieving the sensor assembly. As shown in FIG. 3, the wire (30) is wound onto a winding roll (31) placed on the ground, and the winding roll (31) is controlled in a rotational direction and rotational speed by a rotation motor (32).

[0048] When the sensor assembly advances into the horizontal borehole (B), the rotary motor (32) rotates the winding roll (31) in the wire extraction direction to unwind the wire at a speed synchronized with the sensor's advancement speed, and when retrieving, rotates it in the reverse direction to wind the wire (30). This partially adopts the horizontal rotating drum principle of the prior art No. 10-1311208, but the present invention is differentiated in that it fundamentally avoids electrode damage and cable load problems by separating the roles so that the roller handles active propulsion and the wire only handles data transmission and auxiliary maintenance.

[0049] As shown in FIG. 4, the pipe (40) is a rigid connector for extending and propelling the sensor guide (20) into the horizontal borehole (B), and has structural features in the cross-sectional shape, open hole (41), one end groove (42) and second pinhole (43), continuous projection (46), and wheel (47).

[0050] That is, the pipe (40) preferably has a square cross section with corners arranged in vertical and horizontal directions. The square cross section structure (i) prevents twisting during movement to maintain consistent protrusion-groove coupling and pinhole alignment, and (ii) minimizes contact friction by separating the pipe (40) from the ground and the inner wall of the ball by mounting wheels (47) on each of the two bottom sides.

[0051] In addition, an opening (41) is formed along the longitudinal direction on the side of the pipe (40), particularly on the top surface, as shown in FIG. 5. The opening (41) allows the wire (30) to enter the pipe from the side of the pipe, and it is preferable that the opening (41) be formed on the top of the pipe (40) so that when the pipe up / down mover (94) raises the pipe (40), the wire (30) located at the top is naturally inserted into the pipe through the opening (41).

[0052] And at one end (front end) of the pipe (40), a groove (42) is formed into which the first protrusion (21) of the preceding sensor guide (20) or the second protrusion (44) of the preceding pipe is inserted, and on the side thereof, a second pinhole (43) is formed through which it is aligned with the first pinhole (22) or the third pinhole (45) of the second protrusion (44).

[0053] Additionally, a second protrusion (44) and a third pinhole (45) having the same structure as the first protrusion (21) are formed at the other end (rear end) of the pipe (40), so that it can be joined in the same way as a subsequent pipe. Due to this symmetrical structure, the pipe (40) can be extended infinitely.

[0054] And, on the outer surface of the pipe (40), preferably on the upper left and lower left and right sides, a continuous projection (46) is formed along the longitudinal direction. The continuous projection (46) has a shape similar to the teeth of a rack gear and meshes with the corresponding projection (62) of the roller (61) described later to receive the forward and backward driving force of the pipe (40).

[0055] In addition, wheels (47) are mounted on each of the two lower sides of the pipe (40) to keep the pipe (40) apart from the ground (or the inner wall of the ball) at a certain distance while simultaneously facilitating movement through rolling friction.

[0056] The above pin (50), as shown in FIG. 8, has a metallic head and a cylindrical body and connects the two members by being simultaneously inserted into the first pin hole (22) of the sensor guide (20) and the second pin hole (43) of the pipe (40) (see FIG. 11 (d)) or by being simultaneously inserted into the third pin hole (45) of the preceding pipe and the second pin hole (43) of the subsequent pipe (see FIG. 13 (c)). Since the pin (50) only needs to maintain the connection between the sensor guide (20) and the pipe (40), and between the pipes (40) themselves, while inserted into the pin hole, it is acceptable for no screw threads to be formed. Furthermore, in the present invention, it is preferable to use two pins (50) to ensure the robustness of the connection between the pipes (40).

[0057] It is preferable that these pipes (40) and pins (50) be made of a corrosion-resistant material such as stainless steel, considering long-term operation in a groundwater environment.

[0058] The roller moving unit (60) above, as shown in FIGS. 6 and 7, is a core component responsible for driving the pipe (40) in the longitudinal direction and is largely composed of a roller (61) and a moving part (63).

[0059] The roller (61) performs the function of moving the pipe (40) back and forth through a corresponding projection (62) that engages with a continuous projection (46) on the outer surface of the pipe (40), and can be configured in various ways; however, in this embodiment, an endless track-type roller (61) is adopted. This is intended to enable the pipe (40) to be driven back and forth more stably and with relatively large power, as the endless track is driven in one direction or the other by a wheel that rotates by the drive of a motor, and the corresponding projection (62) formed on the outer surface of the endless track moves while engaging with the continuous projection (46) of the pipe (40).

[0060] The moving part (63) is driven such that the roller (61) is mounted and the corresponding projection (62) of the roller (61) engages with or disengages from the continuous projection (46) of the pipe (40), and includes a base part (64), a moving rod (65), and an adapter (66).

[0061] The base part (64) is a fixed frame that is spaced apart at a certain distance from the side of the pipe (40).

[0062] The moving rod (65) is configured as a rod-type actuator mounted on the base part (64) and capable of moving back and forth toward the side of the pipe (approaching / moving away from the side of the pipe), and can be implemented using a hydraulic cylinder, a pneumatic cylinder, or a linear motor.

[0063] The adapter (66) is mounted on the tip of the movable rod (65), and an installation surface is formed at the top and bottom so that a roller (61) can be installed. By enabling the installation of a roller (61) on both the top and bottom sides of the adapter (66), it can be flexibly implemented in a configuration such as (i) engaging the upper roller (61) with the projection (46) on the upper surface of the pipe (40), or (ii) engaging the lower roller (61) with the projection (46) on the lower surface of the pipe (40).

[0064] With this configuration, the upper roller (61) can be moved forward by the movable rod (65) advancing so that the roller (61) of the adapter (66) engages with the continuous projection (46) of the pipe (40) and the pipe (40) can be moved forward and backward by the rotation of the roller (61). Additionally, the lower roller (61) is driven in the same way as the upper roller (61), but since the lower roller (61) must avoid interference with the wheel (47), when the lower wheel (47) of the pipe needs to pass through the roller (61) section, the movable rod (65) moves backward to separate the roller (61) from the side of the pipe (40) (release engagement) so that the wheel (47) can pass, and after the wheel (47) passes, the movable rod (65) moves forward again to re-engage the roller (61) with the continuous projection (46). By this selective engagement and disengagement operation, it is possible to maintain slip-free driving between the pipe protrusion and the roller protrusion while completely avoiding interference with the wheel (47).

[0065] The pin fastening rod (70) is a rod-shaped automated fastening tool having a magnetic tip, as illustrated in FIG. 8. The pin (50) insertion operation of the pin fastening rod (70) is performed through the following steps: ① the pin fastening rod (70) moves to the position of the pin (50) on the pin table (80); ② the tip of the pin fastening rod (70) grips the pin (50) by magnetic force; ③ the pin fastening rod (70) moves upward toward the pin hole to insert the pin (50) into the first and second pin holes or the second and third pin holes; and ④ after the pin (50) is seated in the pin hole, the pin fastening rod (70) moves sideways to detach from the pin (50). In addition, the pin removal operation of the pin fastening rod (70) is performed by the pin fastening rod (70) approaching the head of the pin (50), magnetically coupling it to the head of the pin (50), and then pulling it upward to remove the pin (50) from the pin hole.

[0066] The pin table (80) is a structure that accommodates a plurality of pins (50) on its upper surface, as shown in FIG. 8, and is preferably positioned on the path of the pipe (40) to minimize the path of the pin fastening rod (70). This shortens the reciprocating time of the pin fastening rod (70) and speeds up the entire fastening cycle.

[0067] Meanwhile, since dozens to hundreds of pipes (40) must be continuously supplied to a long-distance horizontal borehole (B), the present invention includes an automatic pipe supply unit (90) that automates the transfer of pipes (40) from storage to the connection position, as shown in FIG. 9. The automatic pipe supply unit (90) includes a pipe storage table (91), a pipe left / right mover (92), and a pipe up / down mover (94). The pipe storage table (91) is a platform in which a plurality of pipes (40) are stored in a parallel arrangement. The pipe left / right mover (92) is an actuator that pushes the pipes (40) of the pipe storage table (91) in the left / right (side) direction and transfers them to the pipe up / down mover table (93). Additionally, the pipe vertical movement table (93) is an intermediate platform on which the pipe (40) that has been moved left and right is placed, and the pipe vertical movement device (94) is a vertical actuator that raises the vertical movement table (93) and the pipe (40) on it to a connection position (a height that is horizontally aligned with the preceding pipe or sensor guide).

[0068] In particular, the present invention is designed so that when the pipe (40) is raised by the pipe up / down moving device (94), the wire (30) passes through the opening (41) formed at the top of the pipe (40), thereby allowing the wire (30) to naturally enter the inside of the pipe (40) through the opening (41). As a result, all pipes (40) can be assembled with the wire (30) penetrating them without the need for a separate operation to connect the wire (30) and the pipe (40).

[0070] Next, a method for entering a horizontal borehole logging sensor according to the present invention is described.

[0071] FIG. 10 is a flowchart illustrating a method for entering a horizontal borehole logging sensor according to the present invention.

[0072] As described above, the horizontal borehole logging sensor entry method according to the present invention includes the following steps using the horizontal borehole logging centralizer described above.

[0073] [Step (a)] A logging sensor (10) (electrical resistivity sensor, sound wave sensor, density sensor, natural gamma sensor, optical / acoustic televiewer, hydraulic logging sensor, 3-axis seismic sensor, etc.) is mounted inside the sensor guide (20), and one end of a wire (30) for transmitting measurement data is connected to the rear of the sensor (10) or the sensor guide (20). The other end of the wire (30) is connected to a winding roll (31) on the ground, and the winding roll (31) is driven by a rotary motor (32).

[0074] [Step (b)] As shown in FIG. 11 (a), the wire (30) is passed through the first pipe (40), and as shown in FIG. 11 (b), the first protrusion (21) formed in the sensor guide (20) is inserted into the groove (42) formed at one end of the first pipe (40). At this time, the wire (30) enters the inside of the pipe (40) through the opening (41) on the side (top) of the pipe.

[0075] [Step (c)] After the pin fastening rod (70) magnetically grips the pin (50) on the pin table (80), the pin (50) is inserted in a state aligned with the first pin hole (22) of the sensor guide (20) and the second pin hole (43) of the first pipe (40), as shown in (d) of FIG. 11. After insertion, the pin fastening rod (70) moves sideways and separates from the pin (50), thereby completing the connection between the sensor guide (20) and the first pipe (40).

[0076] [Step (d)] As shown in FIG. 12, the roller (61) is rotated forward while the corresponding projection (62) of the roller (61) is engaged with the continuous projection (46) on the outer surface of the first pipe (40). Accordingly, the sensor (10), sensor guide (20), and the first pipe (40) advance as a whole in the direction of the horizontal borehole (B). When the lower wheel (47) of the pipe (40) approaches the section of the roller (61) while advancing, the moving rod (65) moves backward to disengage the roller (61), and after passing the wheel (47), moves forward again to re-engage.

[0077] [Step (e)] As shown in FIG. 13 (a), the second pipe (40) supplied from the pipe automatic supply unit (90) is passed through the wire (30), and as shown in FIG. 13 (b), the second protrusion (44) formed at the other end of the first pipe (40) is inserted into the groove (42) at one end of the second pipe (40).

[0078] [Step (f)] As illustrated in (c) of FIG. 13, the two pipes (40) are connected by the pin connecting rod (70) magnetically gripping the pin (50) and inserting it into the second pin hole (43) of the first pipe (40) and the third pin hole (45) of the second pipe (40). It is preferable to insert two pins (50) to ensure the tightness of the connection.

[0079] [Step (g)] As shown in FIG. 14, the roller (61) is driven to further advance the connected pipe assembly by engaging the corresponding projection (62) of the roller (61) with the continuous projection (46) on the outer surface of the pipe.

[0080] [Step (h)] Repeat steps (f) and (g) to advance the sensor (10) to the target depth.

[0081] In addition, in this step (h), steps (i), (j), and (k) below may also be performed, as shown in FIG. 15. That is, in step (h), a cyclic cycle of steps (i) → (j) → (k) → (f) → (g) is performed continuously until the sensor (10) reaches the target depth.

[0082] [Step (i)] One of the pipes (40) stored in alignment on the pipe storage table (91) is moved left and right by the pipe left / right mover (92).

[0083] [Step (j)] When the pipe (40) is placed on the pipe vertical movement table (93) by left and right movement, the pipe vertical movement device (94) raises the vertical movement table (93) to move the third pipe (40) to the connection position, and in this process, the wire (30) is naturally inserted into the pipe (40) through the opening (41) at the top of the pipe (40).

[0084] [Step (k)] The roller (61) is driven in the reverse direction to induce a connection by inserting the second protrusion (44) of the preceding pipe (40) (second pipe (40)) into the third pipe groove (42).

[0085] Meanwhile, in the recovery stage, the process proceeds in the reverse order of the above entry procedure. That is, the pipe (40) is sequentially disassembled in the order of reverse rotation drive of the roller (61) → magnetic removal of the pin (50) by the pin fastening rod (70) → lowering of the pipe (40) and return via the vertical moving table (93) → return to the storage table via the pipe left and right moving device (92). At this time, the wire (30) is wound onto the winding roll (31) by reverse rotation of the rotary motor (32).

[0087] The rights of the present invention are not limited to the embodiments described above but are defined by what is stated in the claims, and it is obvious that a person skilled in the art may make various modifications and adaptations within the scope of the rights described in the claims. Explanation of the symbols

[0089] 10 : Sensor 20 : Sensor guide 21 : First protrusion 22 : First pinhole 30: Wire 31: Winding Roll 32: Rotary Motor 40 : Pipe 41 : Opening 42 : Groove 43 : Second pinhole 44 : Second protrusion 45 : 3rd pinhole 46 : Continuous protrusion 47 : Wheel 50 : Pin 60 : Roller moving unit 61 : Roller 62 : Corresponding projection 63 : Moving part 64 : Base part 65 : Moving pole 66 : Adapter 70 : Pin fastening rod 80 : Pin table 90: Automatic pipe feeder 91: Pipe storage table 92 : Pipe Left / Right Mover 93 : Pipe vertical movement table 94 : Pipe Up / Down Mover

Claims

Claim 1 A logging centralizer for a horizontal borehole for inserting and retrieving a logging sensor into a horizontal borehole, comprising: a sensor guide having a logging sensor mounted inside and a first protrusion formed on its outer surface with a first pinhole drilled therein; a wire connected to the sensor or the sensor guide, wound onto a winding roll, and having its winding and unwinding controlled by a rotary motor; a pipe having an opening formed on its side to allow the wire to pass through and be arranged in the longitudinal direction, a groove formed at one end into which the first protrusion is inserted and a second pinhole formed therein, a second protrusion and a third pinhole formed at the other end having the same structure as the first protrusion and the second pinhole, a continuous projection formed on its outer surface, and a wheel mounted on its bottom; and a pin inserted into the first and second pinholes or the second and third pinholes to connect the sensor guide and the pipe or the pipes to each other. A horizontal borehole logging centralizer comprising: a roller having a corresponding projection that engages with a continuous projection on the outer surface of the pipe to drive in the longitudinal direction of the pipe to move the pipe back and forth, and a moving part that drives the roller to be mounted and the corresponding projection of the roller to engage or disengage from the continuous projection of the pipe; wherein the moving part comprises a base part spaced apart from the side of the pipe, a moving rod mounted on the base part and moving back and forth toward the side of the pipe, and an adapter mounted on the tip of the moving rod and having mounting surfaces formed at the top and bottom for installing the roller; wherein the pipe is formed with a square cross-section in which the corners are arranged in vertical and horizontal directions, and the wheels are each mounted on the two bottom surfaces of the pipe to space the pipe apart from the ground. Claim 2 delete Claim 3 delete Claim 4 A logging centralizer for a horizontal borehole according to claim 1, further comprising a pin fastening rod that grips the pin by magnetic force and inserts it into the first and second pinholes. Claim 5 A logging centralizer for a horizontal borehole according to claim 4, further comprising a pin table positioned on the path of the pipe to minimize the path of the pin fastening rod and accommodating a plurality of pins on its upper surface. Claim 6 A horizontal borehole logging centralizer according to claim 1, further comprising: a pipe storage table for storing a plurality of pipes in alignment; a pipe left / right mover for moving the pipes of the pipe storage table by pushing them left / right; and a pipe up / down mover for raising the pipes of the up / down mover table to a connection position, wherein the pipes of the pipes of the pipe storage table are positioned at the pipe up / down mover table. Claim 7 A logging centralizer for a horizontal borehole according to claim 6, characterized in that the opening of the pipe is formed at the top, and a wire is inserted through the opening of the pipe by raising the pipe in the pipe up / down moving device. Claim 8 A method for sensor entry using a logging centralizer for a horizontal borehole, comprising: (a) mounting a sensor inside a sensor guide and connecting a wire to the rear of the sensor or the sensor guide; (b) passing the wire through a first pipe and inserting a first protrusion formed in the sensor guide into a groove in the pipe; (c) connecting the sensor guide and the pipe by magnetically gripping a pin with a pin and inserting it into a first pin hole in the sensor guide and a second pin hole in the pipe; (d) driving the roller with a corresponding protrusion of the roller engaged with a continuous protrusion on the outer surface of the pipe to advance the pipe together with the sensor and the sensor guide; (e) passing the second pipe through the wire and inserting a second protrusion formed in the first pipe into a groove in the second pipe; (f) connecting the two pipes by magnetically gripping a pin with a pin and inserting it into a second pin hole in the first pipe and a third pin hole in the second pipe; (g) driving the roller with a corresponding protrusion of the roller engaged with a continuous protrusion on the outer surface of the pipe to advance the pipe; A method for entering a horizontal borehole logging sensor, characterized by including the step of advancing the sensor to a target depth by repeating steps (f) and (g) (h). Claim 9 A method for entering a horizontal borehole logging sensor according to claim 8, further comprising: (i) a step of moving a pipe on a pipe storage table in which a plurality of pipes are aligned and stored by pushing it left and right; (j) a step in which, when a third pipe is placed on a pipe up and down moving table by the left and right movement, the pipe up and down moving table is raised to move the third pipe to a fastening position and pass a wire through it; and (k) a step of driving the roller in the reverse direction to insert a second protrusion formed on the second pipe into a groove of the third pipe; wherein in step (h), steps (i), (j), (k), (f), and (g) are repeated.

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