A protection device for well logging

Abstract

The utility model provides a kind of protective device for well logging, comprising: cylinder, the installation cavity for installing detection instrument is equipped in the cylinder;Supporting assembly, multiple supporting assembly is installed to the outside of cylinder, multiple supporting assembly is evenly arranged along the axis of cylinder, and the supporting assembly includes middle pole and two side poles, the side pole one end is hinged with the one end of articulated rod, and the other end is movably connected to middle pole along the length direction of middle pole, the other end of articulated rod is hinged with the lateral wall of cylinder, and the length direction of middle pole is arranged in parallel with the axis of cylinder;Elastic component, the elastic component is used to drive supporting assembly to move in the direction away from cylinder.The utility model has beneficial effects: compared with traditional device, the collision between cylinder and well wall can be reduced by setting supporting assembly, to prevent the damage of detection equipment.And under the action of elastic component, the device can be located in the center of drilling as far as possible, and the accuracy of well logging is improved.

Description

Technical Field

[0001] This utility model belongs to the field of well logging technology, and in particular relates to a protective device for well logging. Background Technology

[0002] During oil drilling, logging, also known as completion logging, must be performed after drilling to the designed well depth to obtain various petroleum geological and engineering data, which serve as the original data for well completion and oilfield development. The second series of logging performed after the casing is installed in the oil well is conventionally called production logging or development logging. The development of production logging has generally gone through four stages: analog logging, digital logging, numerical control logging, and imaging logging. A large number of logging detectors are required during the logging process.

[0003] Well logging equipment needs to be lowered into the well to measure the surrounding geological conditions. The following problems exist during the descent and retrieval of well logging equipment: First, the equipment is prone to collision with the well wall, causing damage. Second, the equipment is not located in the center of the well, resulting in inaccurate logging results. Third, if the retrieval rope breaks during the retrieval process, the equipment will fall to the bottom of the well and be difficult to retrieve. Utility Model Content

[0004] In view of this, the present invention aims to provide a protective device for well logging, in order to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A well logging protective device includes: a cylinder with an installation cavity for mounting detection instruments; a support assembly, wherein multiple support assemblies are mounted on the outside of the cylinder and are evenly arranged circumferentially along the axis of the cylinder; each support assembly includes a central rod and two side rods, one end of each side rod is hinged to one end of a hinged rod, and the other end is movably connected to the central rod along its length; the other end of the hinged rod is hinged to the outer wall of the cylinder; the length direction of the central rod is parallel to the axis of the cylinder; and an elastic component for driving the support assembly to move away from the cylinder.

[0007] Furthermore, the end of the side rod away from the central rod is inclined towards the cylinder to form a guide section;

[0008] A roller is rotatably connected to the side rod, and the side wall of the roller on the side rod protrudes from the end face of the side rod away from the cylinder.

[0009] A roller is rotatably connected to the central rod, and the side wall of the roller on the central rod protrudes from the end face of the central rod away from the cylinder.

[0010] Furthermore, an insert plate is fixedly provided at one end of the side rod near the middle rod, and two guide bosses are fixedly provided on the side wall of the insert plate. The two guide bosses are arranged along the length direction of the middle rod. The middle rod has a slot that matches the insert plate, and the side wall of the slot has a strip hole that matches the guide boss. Both guide bosses are located inside the strip hole.

[0011] Furthermore, a first hinge plate is fixedly provided at the end of the side rod away from the middle rod, and a second hinge plate is fixedly provided on the outer wall of the cylinder. One end of the hinge rod is hinged to the first hinge plate, and the other end is hinged to the second hinge plate.

[0012] One of the side bars has its hinged rods tilted towards the other side bar from the end of the side bar.

[0013] Furthermore, the elastic component is a compression spring, which is installed between the central rod and the outer wall of the cylinder;

[0014] A connecting rod is fixedly provided on the end face of the middle rod near the cylinder. A guide rod is fixedly provided on the end of the connecting rod away from the middle rod. The diameter of the guide rod is larger than the diameter of the connecting rod. A guide tube is provided on the outer wall of the cylinder. The inner diameter of the guide tube matches the diameter of the guide rod. The guide rod is located inside the guide tube. An annular limiting boss is fixedly provided on the inner side of the end of the guide tube near the middle rod. The inner diameter of the annular limiting boss matches the diameter of the connecting rod. The annular limiting boss limits the guide rod. The compression spring is located outside the guide tube.

[0015] Furthermore, a stud is fixed on the outer wall of the cylinder, and an internal thread is opened on the inner side of the guide tube near the cylinder, and the guide tube is threadedly connected to the stud.

[0016] Furthermore, an end cap is fixedly provided at the lower end of the cylinder, and an external threaded pipe is fixedly provided at one end of the end cap near the cylinder. The external threaded pipe of the end cap is threadedly connected to the inner side of the lower end of the cylinder.

[0017] Furthermore, the upper end of the cylinder is provided with a drop-stop component;

[0018] The anti-fall component includes:

[0019] The mounting tube has its lower end fixed to an externally threaded tube, and the externally threaded tube is threaded to the inner side of the upper end of the cylinder. A vertically arranged sliding hole is opened on the side wall of the mounting tube.

[0020] A sliding tube is movably connected to the inside of an mounting tube. A first baffle is fixed at the upper end of the sliding tube, and a second baffle is fixed at the lower end of the mounting tube. An inertial ball is provided between the second baffle and the first baffle. A lever plate corresponding to a sliding hole is fixed on the outer wall of the sliding tube. The height of the lever plate is less than the height of the sliding hole. The lever plate passes through the sliding hole. A limiting pin is provided on the part of the lever plate that protrudes from the sliding hole and is perpendicular to the axis of the sliding tube.

[0021] The upper end of the swing arm is hinged to the third hinge plate on the side wall of the mounting tube. The third hinge plate is located above the sliding hole. The lower end of the swing arm has an inverted conical structure. The swing arm has an L-shaped hole corresponding to the limiting pin. The horizontal part of the L-shaped hole has an opening on the end face of the swing arm near the mounting tube.

[0022] An inverted conical protective tube is fixed to the outside of the cylinder. The upper end of the protective tube is lower than the lower end of the swing arm, and the outer radius of the upper end of the protective tube is greater than the distance from the swing arm away from the end face of the cylinder to the axis of the cylinder.

[0023] Furthermore, a positioning tube is fixed on the upper surface of the second baffle. The outer diameter of the positioning tube matches the inner diameter of the slide tube. The slide tube is installed on the outside of the positioning tube, and the inertial ball is located on the inside of the positioning tube. The diameter of the inertial ball is smaller than the diameter of the positioning tube.

[0024] Furthermore, the upper end of the mounting tube is provided with a cover plate, a lifting ring is fixed on the cover plate, and the lower end of the cover plate is threaded to the inner side of the upper end of the mounting tube;

[0025] An installation ring is provided between the cover plate and the installation tube. An installation post is fixed on the side wall of the installation ring. A tension spring is provided on the installation post. The end of the tension spring away from the installation post is connected to the end of the swing arm away from the third hinge plate.

[0026] Compared with the prior art, the well logging protection device of this utility model has the following beneficial effects:

[0027] (1) The logging protection device described in this utility model, compared with traditional devices, can reduce the collision between the cylinder and the well wall by setting up a support component, thus preventing damage to the detection equipment. Furthermore, under the action of the elastic component, the device can be positioned as close as possible to the center of the well, improving the accuracy of logging.

[0028] (2) The protective device for logging described in this utility model, when the rope of the lifting device suddenly breaks, the lower end of the swing arm is inserted into the well wall in the open state to prevent the device from falling further. When the retrieval tool moves the device upward, the lower end of the swing arm will move towards the cylinder, which will not generate resistance and facilitate the removal of the device, thus reducing the difficulty of retrieval. Attached Figure Description

[0029] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0030] Figure 1 This is a three-dimensional structural diagram of the swing arm in the closed state according to an embodiment of the present invention;

[0031] Figure 2 This is a three-dimensional structural diagram of the swing arm in the open state according to an embodiment of the present utility model;

[0032] Figure 3 As described in the embodiments of this utility model Figure 2 Schematic diagram of the structure at point A in the middle;

[0033] Figure 4 This is a schematic diagram of the three-dimensional structure of the side rod according to an embodiment of the present utility model;

[0034] Figure 5 This is a schematic diagram of the three-dimensional structure of the central rod according to an embodiment of the present utility model;

[0035] Figure 6 This is a schematic diagram of the three-dimensional structure of the cylindrical body according to an embodiment of the present utility model;

[0036] Figure 7 This is a three-dimensional structural diagram of the mounting pipe described in an embodiment of the present utility model;

[0037] Figure 8 This is a schematic diagram of the three-dimensional structure of the slide tube according to an embodiment of the present utility model;

[0038] Figure 9 This is a schematic diagram of the three-dimensional structure of the cover plate according to an embodiment of the present utility model;

[0039] Figure 10 This is a schematic diagram of the three-dimensional structure of the swing arm according to an embodiment of the present utility model;

[0040] Figure 11 This is a schematic cross-sectional view of the device described in an embodiment of the present invention;

[0041] Figure 12 As described in the embodiments of this utility model Figure 11 Schematic diagram of the structure at point B;

[0042] Figure 13 As described in the embodiments of this utility model Figure 11 Schematic diagram of the structure at point C;

[0043] Figure 14 This is a schematic diagram of the swing arm opening process according to an embodiment of the present utility model.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Cylinder; 2. Mounting tube; 3. Cover plate; 4. Mounting ring; 5. Swing arm; 6. Center rod; 7. Side rod; 8. Roller; 9. Hinge rod; 10. Compression spring; 11. Protective tube; 12. Sliding tube; 13. Guide tube; 14. Inertia ball; 101. End cap; 102. Second hinge plate; 103. Stud; 201. Sliding hole; 202. Third hinge plate; 203. Positioning tube; 301. Lifting ring; 401. Tension spring; 402. Mounting column; 501. L-shaped hole; 601. Slot; 602. Strip hole; 603. Connecting rod; 604. Guide rod; 701. Guide part; 702. First hinge plate; 703. Guide boss; 1201. Pulley; 1202. Limit pin. Detailed Implementation

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0047] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0048] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0049] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] like Figures 1 to 14As shown, a well logging protective device includes: a cylinder 1, with an installation cavity inside the cylinder 1 for installing detection instruments; a support assembly, with multiple support assemblies installed on the outside of the cylinder 1, the multiple support assemblies being evenly arranged circumferentially along the axis of the cylinder 1, each support assembly including a central rod 6 and two side rods 7, one end of each side rod 7 being hinged to one end of a hinged rod 9, and the other end being movably connected to the central rod 6 along the length direction of the central rod 6, the other end of which is hinged to the outer wall of the cylinder 1, the length direction of the central rod 6 being parallel to the axis of the cylinder 1; and an elastic component, the elastic component being used to drive the support assembly to move away from the cylinder 1.

[0051] There are three support components.

[0052] The end of the side rod 7 away from the middle rod 6 is inclined towards the cylinder 1 to form a guide part 701. The guide parts 701 of the two side rods 7 play a guiding role during the process of the device rising and falling in the well, preventing the side rods 7 from inserting into the inner side of the well wall. Rollers 8 are rotatably connected to the side rods 7. The side wall of the rollers 8 on the side rods 7 protrudes from the end face of the side rods 7 away from the cylinder 1. The setting of the rollers 8 reduces the friction between the side rods 7 and the well wall. Rollers 8 are rotatably connected to the middle rod 6. The side wall of the rollers 8 on the middle rod 6 protrudes from the end face of the middle rod 6 away from the cylinder 1. The setting of the rollers 8 reduces the friction between the middle rod 6 and the well wall.

[0053] In some embodiments, a plate is fixedly provided at one end of the side rod 7 near the middle rod 6. Two guide bosses 703 are fixedly provided on the side wall of the plate, and the two guide bosses 703 are arranged along the length direction of the middle rod 6. The middle rod 6 has a slot 601 that matches the plate, and a slot 601 has a strip hole 602 that matches the guide bosses 703 on its side wall. Both guide bosses 703 are located inside the strip hole 602. The arrangement of the two guide bosses 703 allows the side rod 7 to move only along the length direction of the middle rod 6.

[0054] In other embodiments, the end of the side rod 7 away from the guide portion 701 is located inside the middle rod 6 to achieve a guiding function.

[0055] A first hinge plate 702 is fixed to the end of the side rod 7 away from the central rod 6, and a second hinge plate 102 is fixed to the outer wall of the cylinder 1. One end of the hinge rod 9 is hinged to the first hinge plate 702, and the other end is hinged to the second hinge plate 102. The end of the hinge rod 9 of one side rod 7 away from the side rod 7 is inclined towards the other side rod 7. The inclination of the hinge rod 9 facilitates the movement and resetting of the side rod 7 towards the cylinder 1, ensuring the stability of the guiding and resetting process. The two hinge rods 9 are inclined in different directions and are both movably connected to the central rod 6 along the length of the central rod 6. They can deform smoothly during descent and ascent, preventing the support assembly from getting stuck on the well wall.

[0056] In some embodiments, the elastic component is a compression spring 10, which is installed between the central rod 6 and the outer wall of the cylinder 1. A connecting rod 603 is fixed on the end face of the central rod 6 near the cylinder 1, and a guide rod 604 is fixed on the end of the connecting rod 603 away from the central rod 6. The diameter of the guide rod 604 is larger than the diameter of the connecting rod 603. A guide tube 13 is provided on the outer wall of the cylinder 1, and the inner diameter of the guide tube 13 matches the diameter of the guide rod 604. The guide rod 604 is located inside the guide tube 13. An annular limiting boss is fixed on the inner side of the end of the guide tube 13 near the central rod 6. The inner diameter of the annular limiting boss matches the diameter of the connecting rod 603. The annular limiting boss limits the guide rod 604, and the compression spring 10 is located outside the guide tube 13. When the device encounters an obstacle while moving in the well, the support assembly moves towards the cylinder 1 under the guidance of the guide part 701. During this process, the compression spring 10 is further compressed. When the obstacle disappears, the support assembly resets under the elastic force of the compression spring 10. A stud 103 is fixed on the outer wall of the cylinder 1. The inner side of the guide tube 13 near the cylinder 1 has an internal thread. The guide tube 13 is threaded to the stud 103. By rotating the guide tube 13, the elastic force of the compression spring 10 and the distance between the support component and the cylinder 1 can be adjusted. This is suitable for different working conditions and broadens the application range of the device.

[0057] In other embodiments, the elastic component is a torsion spring. One end of the torsion spring is connected to the end of the hinge rod 9 near the cylinder 1, and the other end is connected to the cylinder 1. A connecting rod 603 is fixed on the end face of the middle rod 6 near the cylinder 1. A guide rod 604 is fixed on the end of the connecting rod 603 away from the middle rod 6. The diameter of the guide rod 604 is larger than the diameter of the connecting rod 603. A guide tube 13 is provided on the outer wall of the cylinder 1. The inner diameter of the guide tube 13 matches the diameter of the guide rod 604. The guide rod 604 is located inside the guide tube 13. An annular limiting boss is fixed on the inner side of one end of the connecting rod 603 near the middle rod 6. The inner diameter of the annular limiting boss matches the diameter of the connecting rod 603. The annular limiting boss limits the guide rod 604. A stud 103 is fixed on the outer wall of the cylinder 1. An internal thread is opened on the inner side of one end of the guide tube 13 near the cylinder 1. The guide tube 13 is threadedly connected to the stud 103. By rotating the guide tube 13, the elastic force of the compression spring 10 and the distance between the support component and the cylinder 1 can be adjusted, which is suitable for different working conditions and broadens the application range of the device.

[0058] An end cap 101 is fixedly provided at the lower end of the cylinder 1. An externally threaded pipe is fixedly provided at one end of the end cap 101 near the cylinder 1. The externally threaded pipe of the end cap 101 is threadedly connected to the inner side of the lower end of the cylinder 1. The end cap 101 can prevent the detection instruments inside the cylinder 1 from colliding with particles in the well.

[0059] The upper end of the cylinder 1 is equipped with a drop-stop component;

[0060] The anti-falling component includes: a mounting tube 2, the lower end of which is fixed to an externally threaded tube, the externally threaded tube of which is threaded to the inner side of the upper end of the cylinder 1, and a vertically arranged sliding hole on the side wall of the mounting tube 2; a sliding tube 12, which is movably connected to the inner side of the mounting tube 2, the upper end of which is fixed with a first baffle, the lower end of which is fixed with a second baffle, an inertial ball 14 between the second baffle and the first baffle, and a lever plate 1201 corresponding to the sliding hole fixed on the outer side wall of the sliding tube 12, the height of the lever plate 1201 being less than the height of the sliding hole, the lever plate 1201 penetrating the sliding hole, and the portion of the lever plate 1201 protruding from the sliding hole. A limiting pin 1202 is provided at the position, perpendicular to the axis of the slide tube 12; a swing arm 5 is provided, the upper end of which is hinged to a third hinge plate 202 on the side wall of the mounting tube 2, the third hinge plate 202 is located above the slide hole 201, the lower end of the swing arm 5 has an inverted conical structure, and an L-shaped hole 501 corresponding to the limiting pin 1202 is provided on the swing arm 5, the horizontal part of the L-shaped hole 501 has an opening on the end face of the swing arm 5 near the mounting tube 2; an inverted conical protective tube 11 is fixed on the outside of the cylinder 1, the upper end of the protective tube 11 is lower than the lower end of the swing arm 5, and the outer radius of the upper end of the protective tube 11 is greater than the distance from the end face of the swing arm 5 away from the cylinder 1 to the axis of the cylinder 1.

[0061] A positioning tube 203 is fixedly mounted on the upper surface of the second baffle. The outer diameter of the positioning tube 203 matches the inner diameter of the slide tube 12. The slide tube 12 is installed on the outside of the positioning tube 203, and the inertial ball 14 is located on the inside of the positioning tube 203. The diameter of the inertial ball 14 is smaller than the diameter of the positioning tube 203. The positioning tube 203 guides the movement of the slide tube 12, making its movement more stable.

[0062] The upper end of the mounting pipe 2 is provided with a cover plate 3, and a lifting ring 301 is fixed on the cover plate 3. The lower end of the cover plate 3 is threaded to the inner side of the upper end of the mounting pipe 2; the lifting ring 301 facilitates the lifting device.

[0063] When the hoisting device was exiting the well, the hoisting rope suddenly broke (at this time, the relative positions of the limit pin 1202 and the swing arm 5 are as follows). Figure 14 As shown in the left figure), the cylinder 1 decelerates under the resistance of the support assembly, while the inertial ball 14 does not decelerate. Compared to the first baffle that impacts the slide tube 12 in the opposite direction, the slide tube 12 moves upward on the limiting pin 1202 (at this time, the relative position of the limiting pin 1202 and the swing arm 5 is as follows). Figure 14 As shown in the middle diagram (the arrow indicates the direction of movement of the limiting pin 1202), when the limiting pin 1202 is aligned with the connection between the vertical and horizontal parts of the L-shaped hole 501, under the action of the tension spring 401 or the torsion spring, the lower end of the swing arm 5 moves away from the cylinder 1 (at this time, the relative position of the limiting pin 1202 and the swing arm 5 is as follows). Figure 14 As shown in the right figure, the arrow indicates the direction of movement of the limit pin 1202. The limit pin 1202 disengages from the L-shaped hole 501, releasing the limit on the swing arm 5, and the swing arm 5 is in the open state (as shown in the right figure). Figure 2 As shown, the lower end of the swing arm 5 is inserted into the well wall to prevent the device from falling further. When the retrieval tool moves the device upward, the lower end of the swing arm 5 will move towards the cylinder 1 without generating resistance, which facilitates the removal of the device.

[0064] The vertical portion of the L-shaped hole 501 is arranged along the length direction of the swing arm 5, and the horizontal portion of the L-shaped hole 501 is arranged perpendicular to the length direction of the arm.

[0065] In some embodiments, a mounting ring 4 is provided between the cover plate 3 and the mounting tube 2. A mounting post 402 is fixed on the side wall of the mounting ring 4. A tension spring 401 is provided on the mounting post 402. One end of the tension spring 401 away from the mounting post 402 is connected to one end of the swing arm 5 away from the third hinge plate 202.

[0066] In some other embodiments, a torsion spring is provided between the swing arm 5 and the third hinge plate 202, with one end of the torsion spring connected to the swing arm 5 and the other end connected to the third hinge plate 202, for providing elastic force for the swing arm 5 to open.

[0067] Compared to traditional devices, the addition of support components reduces collisions between the cylinder 1 and the well wall, preventing damage to the detection equipment. Furthermore, the elastic components help to position the device as centrally as possible within the wellbore, improving logging accuracy.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

[0069] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A protective device for well logging, characterized in that, include: The cylindrical body (1) has an installation cavity inside for installing testing instruments; Support components, multiple support components are installed on the outside of the cylinder (1), and multiple support components are evenly arranged circumferentially along the axis of the cylinder (1). The support components include a central rod (6) and two side rods (7). One end of the side rod (7) is hinged to one end of the hinge rod (9), and the other end is movably connected to the central rod (6) along the length direction of the central rod (6). The other end of the hinge rod (9) is hinged to the outer wall of the cylinder (1). The length direction of the central rod (6) is parallel to the axis of the cylinder (1). An elastic component is used to drive the support component to move away from the cylinder (1).

2. The logging protection device according to claim 1, characterized in that: The end of the side rod (7) away from the middle rod (6) is inclined toward the cylinder (1) to form a guide part (701); A roller (8) is rotatably connected to the side rod (7), and the side wall of the roller (8) on the side rod (7) protrudes from the end face of the side rod (7) away from the cylinder (1); A roller (8) is rotatably connected to the middle rod (6), and the side wall of the roller (8) on the middle rod (6) protrudes from the end face of the middle rod (6) away from the cylinder (1).

3. A logging protection device according to claim 1, characterized in that: The side rod (7) is fixed with an insert plate at one end near the middle rod (6). Two guide bosses (703) are fixed on the side wall of the insert plate. The two guide bosses (703) are arranged along the length direction of the middle rod (6). The middle rod (6) has a slot (601) that matches the insert plate. The side wall of the slot (601) has a strip hole (602) that matches the guide bosses (703). Both guide bosses (703) are located inside the strip hole (602).

4. A logging protection device according to claim 1, characterized in that: The side rod (7) is fixed with a first hinge plate (702) at one end away from the middle rod (6), and a second hinge plate (102) is fixed on the outer wall of the cylinder (1). One end of the hinge rod (9) is hinged to the first hinge plate (702), and the other end is hinged to the second hinge plate (102). The hinge rod (9) of one of the side rods (7) is inclined towards the other side rod (7) at the end away from the side rod (7).

5. A logging protection device according to claim 1, characterized in that: The elastic component is a compression spring (10), which is installed between the middle rod (6) and the outer wall of the cylinder (1); A connecting rod (603) is fixed on the end face of the middle rod (6) near the cylinder (1). A guide rod (604) is fixed on the end of the connecting rod (603) away from the middle rod (6). The diameter of the guide rod (604) is larger than the diameter of the connecting rod (603). A guide tube (13) is provided on the outer wall of the cylinder (1). The inner diameter of the guide tube (13) matches the diameter of the guide rod (604). The guide rod (604) is located inside the guide tube (13). An annular limiting boss is fixed on the inner side of the end of the guide tube (13) near the middle rod (6). The inner diameter of the annular limiting boss matches the diameter of the connecting rod (603). The annular limiting boss limits the guide rod (604). The compression spring (10) is located outside the guide tube (13).

6. A logging protection device according to claim 5, characterized in that: A stud (103) is fixed on the outer wall of the cylinder (1), and an internal thread is opened on the inner side of the guide tube (13) near the cylinder (1). The guide tube (13) is threadedly connected to the stud (103).

7. A logging protection device according to claim 1, characterized in that: An end cap (101) is fixedly provided at the lower end of the cylinder (1). An external threaded pipe is fixedly provided at one end of the end cap (101) near the cylinder (1). The external threaded pipe of the end cap (101) is threadedly connected to the inner side of the lower end of the cylinder (1).

8. A logging protection device according to claim 1, characterized in that: The upper end of the cylinder (1) is provided with a drop stop assembly; The anti-fall component includes: The mounting tube (2) is fixed at its lower end to the external threaded tube. The external threaded tube of the mounting tube (2) is threaded to the inner side of the upper end of the cylinder (1). A vertically arranged sliding hole (201) is opened on the side wall of the mounting tube (2). A sliding tube (12) is movably connected to the inside of the mounting tube (2). A first baffle is fixed at the upper end of the sliding tube (12), and a second baffle is fixed at the lower end of the mounting tube (2). An inertial ball (14) is provided between the second baffle and the first baffle. A lever plate (1201) corresponding to the sliding hole (201) is fixed on the outer wall of the sliding tube (12). The height of the lever plate (1201) is less than the height of the sliding hole (201). The lever plate (1201) is set through the sliding hole (201). A limiting pin (1202) perpendicular to the axis of the sliding tube (12) is provided on the part of the lever plate (1201) that protrudes from the sliding hole (201). The upper end of the swing arm (5) is hinged to the third hinge plate (202) on the side wall of the mounting tube (2). The third hinge plate (202) is located above the sliding hole (201). The lower end of the swing arm (5) has an inverted conical structure. The swing arm (5) has an L-shaped hole (501) corresponding to the limiting pin (1202). The horizontal part of the L-shaped hole (501) has an opening on the end face of the swing arm (5) near the mounting tube (2). An inverted conical protective tube (11) is fixed on the outside of the cylinder (1). The upper end of the protective tube (11) is lower than the lower end of the swing arm (5). The outer radius of the upper end of the protective tube (11) is greater than the distance from the end face of the swing arm (5) away from the cylinder (1) to the axis of the cylinder (1).

9. A logging protection device according to claim 8, characterized in that: A positioning tube (203) is fixed on the upper surface of the second baffle. The outer diameter of the positioning tube (203) matches the inner diameter of the slide tube (12). The slide tube (12) is installed on the outside of the positioning tube (203). The inertial ball (14) is located on the inside of the positioning tube (203). The diameter of the inertial ball (14) is smaller than the diameter of the positioning tube (203).

10. A logging protection device according to claim 8, characterized in that: The upper end of the mounting pipe (2) is provided with a cover plate (3), and a lifting ring (301) is fixed on the cover plate (3). The lower end of the cover plate (3) is threaded to the inner side of the upper end of the mounting pipe (2). An installation ring (4) is provided between the cover plate (3) and the installation tube (2). An installation post (402) is fixed on the side wall of the installation ring (4). A tension spring (401) is provided on the installation post (402). The end of the tension spring (401) away from the installation post (402) is connected to the end of the swing arm (5) away from the third hinge plate (202).

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