A caliper logging tool

Abstract

The present invention discloses a caliper logging instrument, which relates to the field of caliper measurement technology. The instrument comprises: a housing; a logging arm, wherein the logging arm comprises a large arm structure rotatably mounted on the housing and a small arm structure inserted at one end of the large arm structure, wherein an area near the upper end of the large arm structure is rotatably mounted within the housing via a kingpin, and a side surface of the small arm structure located within the large arm structure is provided with a limiting groove; and a jam-release assembly, wherein the jam-release assembly comprises a jam-release arm, a tension structure, and a limiting post, wherein the limiting post is disposed in an area near the limiting groove on the large arm structure and can be inserted into the limiting groove when under pressure. The caliper logging instrument, by providing the jam-release assembly, can keep the logging arm in a fixed length and non-retractable state during the detection phase, thereby converting all the force exerted by the wellbore wall on the logging arm into a swinging force of the logging arm, thereby improving detection accuracy. When the logging arm is stuck, the upper drive assembly and the jam-release arm work together to control the logging arm to shorten, thereby achieving jam release.

Description

Technical Field

[0001] The present invention relates to the technical field of caliper measurement, in particular to a caliper logging tool. Background Art

[0002] In the field of oilfield logging, measuring the degree of borehole diameter irregularity in openhole wells is becoming increasingly important. By measuring the degree of irregularity in the borehole diameter, the fixed position of the casing during casing installation and the cement dosage parameters required for cementing construction can be selected. The irregular shape of the borehole can also be used to analyze and determine the development and direction of underground rock fractures. However, the current instruments used to measure the diameter change of openhole wells in oilfields have low measurement accuracy. They can only measure the borehole diameter in the X and Y planes and cannot measure the borehole diameter change from multiple angles, resulting in a large deviation between the measurement results and the actual borehole shape. The existing instrument structure has an unguided measuring arm in contact with the wellbore wall and can only slide axially along the instrument's center axis. The measuring arm's own length cannot be changed. If it encounters a pit in the wellbore wall or a radial crack along the wellbore wall, the measuring arm can easily get stuck in the pit or crack, preventing the measuring arm from sliding axially along the instrument, causing the instrument to become stuck and causing inconvenience during logging.

[0003] For this purpose, the patent application number CN201020278065.X proposes a six-arm caliper logging instrument, which uses a micro-rotation angle sensor with high measurement accuracy and can more accurately reflect the conditions in the wellbore. In addition, the caliper logging instrument is designed with a free deflection guide block and a retractable measuring arm in the contact part between the measuring arm and the well wall, which effectively avoids the instrument from getting stuck after being lowered into the well.

[0004] However, it also has certain defects. When encountering uneven parts of the well wall, the force generated by the uneven position on the measuring arm will not only cause the measurement ratio to deflect, but also cause the freely retractable measuring arm to retract itself, thereby affecting the measurement results. Summary of the Invention

[0005] In response to the deficiencies of the prior art, the present invention provides a caliper logging instrument that solves the problem that the force generated by the uneven position on the measuring arm not only causes the measuring ratio to deflect, but also causes the freely retractable measuring arm to retract itself, thereby affecting the measurement results.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A caliper logging tool, comprising:

[0007] shell;

[0008] The logging arm includes a large arm structure rotatably mounted on a housing and a small arm structure inserted at one end of the large arm structure. The area near the upper end of the large arm structure is rotatably mounted in the housing via a kingpin. A limit groove is provided on a side surface of the small arm structure located within the large arm structure.

[0009] The jam release assembly includes a jam release arm, a tension structure and a limit column. The limit column is provided in an area near the limit slot on the large arm structure. When the limit column is under pressure, it can be inserted into the limit slot to limit the small arm structure from sliding on the large arm structure. A long slot is provided at one end of the jam release arm. A secondary pin capable of being inserted into the long slot is fixed in an area near the limit column in the large arm structure. The tension structure is provided in the housing and is used to adjust the position of the jam release arm so that the jam release arm applies or does not apply pressure to the limit column.

[0010] The upper drive assembly is arranged in the shell and is used to apply an upward pulling force to the arm structure when the limit column is separated from the limit groove, so as to shorten the total length of the logging arm and realize the unblocking action.

[0011] Furthermore, when the logging arm is in a naturally extended state, the tension structure is located at the origin position, the auxiliary pin is located in the upper area in the long slot, and the limit column is located in the middle area in the limit slot;

[0012] When the small arm structure contacts the uneven position of the well wall and swings synchronously with the large arm structure, the auxiliary pin can move in the long slot, the limiting column can move in the limiting slot, and the small arm structure and the large arm structure cannot slide relative to each other.

[0013] Furthermore, a spring 3 is sleeved on a section of the limiting column away from the limiting groove, and an end seat is fixedly provided on an end of the limiting column close to the spring 3;

[0014] When the pulling structure pulls the jam-releasing arm, the end seat loses pressure, and the limiting column is separated from the limiting groove by the three rebound effects of the spring, so that the small arm structure and the large arm structure can slide relative to each other.

[0015] Furthermore, the forearm structure includes a forearm body, and a guide column is provided at the upper end of the forearm body;

[0016] A guide groove for guiding the guide column is provided in the large arm structure, and a second spring is provided on the outer sleeve of the guide column. The second spring is located below the guide groove and is used for resetting the small arm structure when it is not subjected to tension.

[0017] Furthermore, the part of the forearm body located in the large arm structure is provided with a widened portion toward the side close to the outer shell, and the limiting groove is opened in the area near the upper end of the widened portion. The area near the upper end of the widened portion is provided with a limiting edge 1, and the other end is provided with a limiting edge 2.

[0018] Furthermore, the upper drive assembly includes:

[0019] A reel, the reel being located in the middle of the housing and capable of actively rotating;

[0020] A roller, the roller being rotatably mounted on the kingpin via a bearing;

[0021] A tension rope, one end of which is fixed to the upper end of the boom structure, and the other end of which is fixed to the reel after being guided by the roller.

[0022] Furthermore, an avoidance groove is provided on the boom structure in an area opposite to the roller, and the tension rope passes through the avoidance groove and out of the boom structure.

[0023] Furthermore, it also includes a faucet and a drive assembly, the faucet is assembled on the upper end of the shell, and the drive assembly includes:

[0024] A rotating shaft, the rotating shaft is located in the axis area of the housing, and the reel is fixed to the lower end of the rotating shaft;

[0025] The supporting bracket is located in the malachite valve, the upper end of the supporting bracket is provided with a main drive motor, and the upper end of the rotating shaft is fixedly connected to the drive shaft of the main drive motor.

[0026] Furthermore, the upper end of the upper arm structure is set as a cam, and a detection component is provided in the malachite valve. When the upper arm structure swings along the kingpin, the cam generates different electrical signals to the detection component.

[0027] Furthermore, the logging arm further comprises a retraction assembly, the retraction assembly comprising a threaded portion provided on the rotating shaft and an internally threaded lifting plate threadedly connected to the threaded portion, wherein the internally threaded lifting plate moves upward to push the cam upward to retract the logging arm;

[0028] A through slot for the logging arm to be folded is provided on the cylindrical wall of the shell.

[0029] The present invention has the following beneficial effects:

[0030] This caliper logging tool, by providing a jam-releasing assembly, can keep the logging arm in a fixed-length, non-retractable state during the detection phase, thereby converting all the force exerted by the wellbore wall on the logging arm into a swinging force for the logging arm, thereby improving detection accuracy; and when the logging arm is stuck, the upper drive assembly and the jam-releasing arm work together to control the logging arm to shorten, thereby achieving jam-releasing.

[0031] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is an appearance diagram of the present invention;

[0033] Figure 2 This is a schematic diagram of the internal structure of the present invention without a tow hook installed;

[0034] Figure 3 For the present invention Figure 2 Exploded view of

[0035] Figure 4Schematic diagram of the internal structure of the housing of the present invention;

[0036] Figure 5 For the present invention Figure 4 The main view;

[0037] Figure 6 This is a schematic diagram of the internal structure of the faucet of the present invention;

[0038] Figure 7 This is an appearance diagram of the connection between the logging arm and the jam-releasing arm of the present invention;

[0039] Figure 8 For the present invention Figure 7 sectional view of

[0040] Figure 9 This is a state diagram of the limiting column of the present invention being inserted into the limiting groove;

[0041] Figure 10 For the present invention Figure 9 A magnified view of area A;

[0042] Figure 11 For the present invention Figure 8 Exploded view of

[0043] Figure 12 Schematic diagram of the internal structure of the big arm structure of the present invention;

[0044] Figure 13 This is a diagram of the logging arm of the present invention being folded in;

[0045] Figure 14 This is a layout diagram of the driving gear and the driven gear in the lower drive component of the present invention.

[0046] In the figure, 1, towing hook; 2, horse head; 3, housing; 31, through slot; 4, logging arm; 41, arm structure; 411, arm body; 412, extension; 413, cam; 414, avoidance slot; 415, guide slot; 416, accommodating slot; 417, compensation slot; 42, arm structure; 421, arm body; 422, widening portion; 423, guide post; 424, limit slot; 425, limit rib 1; 426, limit rib 2; 43, main pin; 44, auxiliary pin; 5, drive assembly; 51, main drive motor; 52, support bracket; 53, rotating shaft; 6 , detection component; 61, sliding potentiometer; 62, force rod; 63, spring one; 64, tray; 7, release assembly; 71, release arm; 711, long slot; 72, tension structure; 721, nut; 722, screw rod; 723, base; 724, pin seat; 725, lower drive component; 73, limiting structure; 731, limiting column; 732, spring three; 733, end seat; 8, upper drive assembly; 81, reel; 82, tension rope; 83, roller; 9, retraction assembly; 91, threaded part; 92, internal thread lifting plate; 93, guide block; 10, spring two. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] The following is based on Figures 1-14 A caliper logging tool provided in an embodiment of the present invention is described.

[0050] See also Figure 1 An embodiment of the present invention provides a caliper logging instrument, including an external component and an internal component. The external component consists of an outer shell 3 and a faucet 2, which are threadedly assembled on the upper end of the faucet 2. A tow hook 1 is threadedly assembled, and another tow hook 1 is assembled at the other end of the outer shell 3 for use with a crawler.

[0051] like Figure 1 and Figure 2As shown, a logging arm 4 is assembled on the housing 3. Three or four logging arms 4 can be provided. The drawings of this embodiment show that a total of four logging arms 4 are provided. A through groove 31 is provided in the area opposite to the logging arm 4 on the housing 3. Each logging arm 4 includes a large arm structure 41 rotatably provided on the housing 3 and a small arm structure 42 inserted at one end of the large arm structure 41.

[0052] Combine Figure 2-Figure 5 As shown, the boom structure 41 includes a boom body 411, the upper end of which is configured as a cam 413 structure. The area near the upper end of the boom body 411 is rotatably mounted within the housing 3 via a main pin 43. Preferably, the main pin 43 is located at the junction of the cam 413 and the boom body 411. A detection assembly 6 is provided within the malachite 2. When the well logging instrument is lowered into the well for measurement, the lower end of the small arm structure 42 directly contacts the well wall. When the lower end of the small arm structure 42 contacts an uneven portion of the well wall, the boom structure 41 and the small arm structure 42 swing on the main pin 43. During the swing, different positions of the cam 413 align with the detection assembly 6, causing the detection assembly 6 to generate different electrical signals.

[0053] like Figure 2 and Figure 6 As shown, specifically, the detection assembly 6 mentioned here includes a force-bearing rod 62 located above the cam 413. The force-bearing rod 62 passes through the upper end of the shell 3 and the lower end of the faucet 2 and then enters the faucet 2. A spring 63 is also sleeved on the force-bearing rod 62. A sliding potentiometer 61 is assembled in the faucet 2. The sliding part of the sliding potentiometer 61 is directly fixed to the force-bearing rod 62. When the force-bearing rod 62 is aligned with the force-bearing rod 62 at different positions of the cam 413, the pressure on the force-bearing rod 62 is different, so that the force-bearing rod 62 pushes the sliding part of the sliding potentiometer 61 to different degrees, forming different electrical signals to represent the detection results.

[0054] Preferably, a tray 64 is further provided on the force-bearing rod 62 for mounting a spring 1 63 .

[0055] like Figure 4 、 Figure 7 and Figure 8 As shown, in order to avoid the logging arm 4 from getting stuck during the process of measuring the diameter of the well, a jamming release assembly 7 is also provided here, and a limiting groove 424 is opened on a side section of the small arm structure 42 located inside the large arm structure 41 for cooperating with the jamming release assembly 7, and an extension portion 412 is extended from the side of the lower end of the large arm body 411 close to the outer shell 3 for accommodating part of the jamming release assembly 7. The above-mentioned jamming release assembly 7 includes a jamming release arm 71, a tension structure 72 and a limiting structure 73, and the limiting structure 73 includes a limiting column 731.

[0056] Specific, combined Figure 7-12As shown, the limiting column 731 is arranged in the area near the limiting groove 424 on the big arm structure 41, specifically in the extension part 412. When the limiting column 731 is under pressure, it can be inserted into the limiting groove 424, thereby limiting the small arm structure 42 from sliding on the big arm structure 41. At this time, the small arm structure 42 and the big arm structure 41 are an integrated structure, the two can swing synchronously and cannot be extended or retracted, thereby ensuring that the concave and convex changes of the well wall can be transmitted to the cam 413 in the form of the small arm structure 42 swinging on the big arm structure 41; a long groove 711 is provided at one end of the unbinding arm 71, and a secondary pin 44 that can be inserted into the long groove 711 is fixed in the area of the big arm structure 41 adjacent to the limiting column 731, and the tension structure 72 is arranged in the outer shell 3.

[0057] When the arm 42 is in the position of contacting the uneven position of the well wall and swinging synchronously with the arm structure 41, the auxiliary pin 44 can move in the long slot 711, and the limit pin 44 can be adjusted to the desired position. 731 can move in the limit groove 424, but the displacement is within a reasonable range, so even if the position of the limit column 731 relative to the limit groove 424 changes, the limit column 731 is still located in the limit groove 424, so that the small arm structure 42 and the large arm structure 41 remain in a state of non-sliding relative to each other and fixed length; when the logging arm 4 encounters a larger obstacle or the deformation of the well wall is too serious, the tension structure 72 is activated. At this time, the tension structure 72 pulls the unblocking arm 71, so that the upper end of the long groove 711 contacts the limit column 731, so that the limit column 731 can be detached from the limit groove 424 after losing pressure. At this time, the small arm body 421 is unlocked from the large arm body 411, and the small arm body 421 can slide in the large arm body 411, so that the length of the entire logging arm 4 can be shortened, thereby achieving the purpose of unblocking.

[0058] It should be noted that when the logging arm 4 swings outward to the maximum angle (this maximum angle is determined by spring 163, and when spring 163 is extended to the maximum length it can extend, that is, when the logging arm 4 swings outward to the maximum angle), the auxiliary pin 44 has not reached the uppermost end of the long slot 711. Although the pressure of the release arm 71 on the limit column 731 is reduced, the limit column 731 is still located in the limit slot 424. However, when the driving pulling structure 72 pulls down the release arm 71, the auxiliary pin 44 can reach the uppermost end of the long slot 711. At this time, the pressure of the release arm 71 on the limit column 731 reaches the minimum, and the limit column 731 is completely out of the limit slot 424.

[0059] like Figure 4 and Figure 14 As shown, the above-mentioned pulling structure 72 includes a base 723 and a screw rod 722. The base 723 is located at the bottom of the shell 3. The screw rod 722 is rotatably installed on the base 723. A nut 721 is threadedly connected to the screw rod 722. A pin seat 724 is provided on one side of the nut 721. The lower end of the release arm 71 is hinged to the pin seat 724. When the screw rod 722 rotates, it can drive the nut 721 to move downward, thereby pulling the lower end of the release arm 71 downward.

[0060] Reference Figure 13 and Figure 14 As shown, the driven screw rod 722 drives the lower component 725: a driving gear is set below the base 723, and a driven gear is set at the lower end of each screw rod 722, so that each driven gear is engaged with the driving gear, and a motor is set below the base 723 to drive the driving gear to rotate; of course, the pulling structure 72 in the present invention is not limited to the structure in this embodiment, as long as it can achieve the purpose of pulling the lower end of the unblocking arm 71.

[0061] Combine Figure 4 、 Figure 8 and Figure 11 In order to shorten the length of the above-mentioned logging arm 4, an upper drive assembly 8 is also provided here. The upper drive assembly 8 is arranged in the housing 3 and is used to apply an upward pulling force to the small arm structure 42 after the limiting column 731 is separated from the limiting groove 424, so as to shorten the total length of the logging arm 4 and realize the unblocking action.

[0062] Preferably, refer to Figures 8-11As shown, in order to ensure that the limiting column 731 can automatically disengage from the limiting groove 424 when the jamming arm 71 loses pressure on the limiting column 731, a spring three 732 is provided in a section away from the limiting groove 424, and an end seat 733 is fixed to the end of the limiting column 731 close to the spring three 732, and the end seat 733 is directly in contact with the jamming arm 71. When the jamming arm 71 generates pressure on the end seat 733, the spring three 732 is in a compressed state, so that when the tension structure 72 pulls the jamming arm 71, the end seat 733 loses pressure, and the limiting column 731 disengages from the limiting groove 424 due to the rebound action of the spring three 732, and the small arm structure 42 and the large arm structure 41 can slide relative to each other.

[0063] In addition, a compensation groove 417 for accommodating the unlocking arm 71 is provided in the extension portion 412 .

[0064] The following describes in detail the plug-in position relationship between the small arm structure 42 and the large arm structure 41. The small arm structure 42 here includes a small arm body 421, and the large arm body 411 and the extension part 412 are provided with a receiving groove 416 for accommodating the small arm body 421. A guide column 423 is provided at the upper end of the small arm body 421, and a guide groove 415 for guiding the guide column 423 is provided in the large arm body 411. The outer sleeve of the guide column 423 is provided with a spring 2 10, and the spring 2 10 is located below the guide groove 415. When the small arm structure 42 is subjected to the tension of the upper drive component 8, it moves upward in the axial direction, and the spring 2 10 is in a compressed state. Conversely, when the small arm structure 42 loses the tension of the upper drive component 8, the spring 2 10 can push the small arm structure 42 to reset.

[0065] Preferably, a widened portion 422 is provided on the portion of the forearm body 421 located within the large arm structure 41 toward the side close to the housing 3, a limiting groove 424 is provided in the area close to the upper end of the widened portion 422, a limiting rib 1 425 is provided in the area close to the upper end of the widened portion 422, and a limiting rib 2 426 is provided at the other end. When the forearm structure 42 is subjected to the pulling force of the upper drive assembly 8, the limiting post 731 slides on the outer surface of the widened portion 422 until the limiting rib 2 426 reaches the position of the limiting post 731. At this time, the forearm structure 42 no longer continues to move upward, but is used for limitation. The limiting rib 1 425 is used to limit the reset area of the forearm structure 42 when the spring 2 10 pushes the forearm structure 42 to reset, thereby preventing it from being reset excessively.

[0066] Combine Figure 8 and Figure 11 As shown, as mentioned above, the upper drive assembly 8 includes a reel 81, a roller 83 and a tension rope 82. The reel 81 is located in the middle of the housing 3, and the reel 81 can rotate actively. The roller 83 is rotatably arranged on the main pin 43 through a bearing. One end of the tension rope 82 is fixed to the upper end of the boom structure 41, and the other end of the roller 83 is fixed on the reel 81 after being guided by the roller 83.

[0067] In this embodiment, when the reel 81 rotates, it can reel in the tension rope 82 , thereby applying tension to the forearm structure 42 , and vice versa, no tension is applied.

[0068] It should be noted that there are four reels 81 , each tension rope 82 matches one reel 81 , and the four reels 81 are coaxial and rotate synchronously, that is, when one of the logging arms 4 is stuck, the four logging arms 4 are unstuck at the same time.

[0069] Preferably, in order to ensure that the tension rope 82 only generates tension on the forearm structure 42 and does not affect the swing of the upper arm structure 41, an avoidance groove 414 is opened in the area opposite to the roller 83 on the upper arm structure 41, and the tension rope 82 passes through the upper arm structure 41 from the avoidance groove 414.

[0070] Reference Figure 2 and Figure 3 As shown, a driving assembly 5 is also provided in the faucet 2, and the driving assembly 5 includes a rotating shaft 53 and a supporting bracket 52. The rotating shaft 53 is located in the axial area of the shell 3, and the reel 81 is fixed to the lower end of the rotating shaft 53. The supporting bracket 52 is located in the faucet 2, and the upper end of the supporting bracket 52 is provided with a main driving motor 51. The upper end of the rotating shaft 53 is fixedly connected to the driving shaft of the main driving motor 51, so that when the main driving motor 51 is working, the rotating shaft 53 can drive the reel 81 to rotate.

[0071] Combine Figure 2-Figure 4 After logging is completed, the logging arm 4 needs to be folded and the device needs to be salvaged, so a folding assembly 9 is also provided here. The folding assembly 9 includes a threaded portion 91 provided on the rotating shaft 53 and an internally threaded lifting plate 92 threadedly connected to the threaded portion 91. The internally threaded lifting plate 92 moves upward to push the cam 413 upward to fold the logging arm 4. A through groove 31 for folding the logging arm 4 is opened on the wall of the outer shell 3.

[0072] Preferably, a guide block 93 is provided on the side of the outer periphery of the internal threaded lifting plate 92 avoiding the logging arm 4, and a guide track is provided on the inner wall of the outer shell 3 in an area opposite to the guide block 93, and the guide track is provided along the axial direction of the outer shell 3.

[0073] It should be noted that during the above-mentioned unblocking action (when the upper drive assembly 8 pulls the small arm structure 42 upward), the internal threaded lifting plate 92 rises synchronously. Therefore, in order to avoid the phenomenon of the internal threaded lifting plate 92 pushing the cam 413 to rotate the logging arm 4 and causing it to get stuck again during the process of the small arm structure 42 moving up to unblock, the initial position of the internal threaded lifting plate 92 is set below the cam 413, and a certain gap is reserved between the two. The specific process is that the small arm structure 42 first moves upward for a small distance. During this process, the internal threaded lifting plate 92 moves upward but does not lift the cam 413; then the small arm structure 42 continues to move upward, and the internal threaded lifting plate 92 starts to lift the cam 413, so that in this process, in addition to the upward movement of the small arm structure 42, the entire logging arm 4 will also rotate and retract, eventually forming Figure 13 The status shown.

[0074] When in use (working), when the device is lowered into the well, the logging arm 4 is Figure 5 In the open state shown in the figure, the limit column 731 is squeezed by the release arm 71 and is located in the limit groove 424, so that the upper arm structure 41 and the lower arm structure 42 are in a mutually locked state. When encountering an uneven position on the well wall, the upper arm structure 41 and the lower arm structure 42 swing on the main pin 43. When they swing, different positions of the cam 413 align with the force rod 62, and the pressure on the force rod 62 is different, so that the force rod 62 pushes the sliding part of the sliding potentiometer 61 to different degrees, forming different electrical signals to represent the detection results.

[0075] When the small arm structure 42 is in a position that contacts the uneven position of the well wall and swings synchronously with the large arm structure 41, the auxiliary pin 44 can move in the long slot 711, and the limiting column 731 can move in the limiting slot 424, but the displacement is within a reasonable range, so even if the position of the limiting column 731 relative to the limiting slot 424 changes, the limiting column 731 is still located in the limiting slot 424, so that the small arm structure 42 and the large arm structure 41 remain in a state of non-sliding relative to each other and fixed length; maintaining the fixed length state of the two can ensure that all the thrust from the well wall received by the small arm structure 42 is transmitted to the cam 413, thereby improving the detection accuracy.

[0076] When encountering a larger obstacle, the small arm structure 42 will be stuck. At this time, the pulling structure 72 is controlled to work first. At this time, the pulling structure 72 pulls the release arm 71, so that the upper end of the long groove 711 contacts the limit column 731, so that the pressure of the release arm 71 on the limit column 731 is greatly reduced, so that the limit column 731 can be separated from the limit groove 424 after losing pressure. At this time, the small arm body 421 is unlocked from the large arm body 411, and then the main drive motor 51 is controlled to work to rotate the shaft 53. When the shaft 53 rotates, it first passes through The tension rope 82 applies tension to the arm structure 42, causing the spring 10 to contract, and the arm structure 42 to move upward a small distance, so that the arm structure 42 first breaks away from the obstacle along its own axis. During this process, the internal threaded lifting plate 92 moves upward but does not lift the cam 413; then the arm structure 42 continues to move upward, and the internal threaded lifting plate 92 begins to lift the cam 413, so that in this process, in addition to the upward movement of the arm structure 42, the entire logging arm 4 will also rotate and retract. When it retracts, the auxiliary pin 44 moves to the lowest end of the long slot 711, and finally forms Figure 13 The card can be released when the status shown is reached.

[0077] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0078] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A caliper logging tool, characterized in that: include: Shell (3); A logging arm (4), the logging arm (4) comprising a large arm structure (41) rotatably mounted on a housing (3) and a small arm structure (42) inserted at one end of the large arm structure (41), wherein an area near the upper end of the large arm structure (41) is rotatably mounted in the housing (3) via a main pin (43), and a limiting groove (424) is provided on a side surface of the small arm structure (42) located in the large arm structure (41); A release assembly (7), the release assembly (7) comprising a release arm (71), a tension structure (72) and a limiting column (731), the limiting column (731) being arranged in an area on the upper arm structure (41) close to the limiting groove (424), the limiting column (731) being able to be inserted into the limiting groove (424) when under pressure to limit the small arm structure (42) from sliding on the upper arm structure (41), one end of the release arm (71) being provided with a long groove (711), a sub-pin (44) being able to be inserted into the long groove (711) being fixed in an area in the upper arm structure (41) close to the limiting column (731), the tension structure (72) being arranged in the housing (3) and being used for adjusting the position of the release arm (71) so that the release arm (71) applies or does not apply pressure to the limiting column (731); An upper drive assembly (8), the upper drive assembly (8) being arranged in the housing (3) and being used for applying an upward pulling force to the small arm structure (42) when the limiting column (731) is separated from the limiting groove (424), so as to shorten the total length of the logging arm (4) and realize a jam-releasing action; When the logging arm (4) is in a naturally opened state, the tension structure (72) is located at the origin position, the auxiliary pin (44) is located in the long slot (711) near the upper area, and the limiting column (731) is located in the middle area of the limiting slot (424); When the small arm structure (42) contacts the uneven position of the well wall and swings synchronously with the large arm structure (41), the auxiliary pin (44) can move in the long slot (711), the limiting column (731) can move in the limiting slot (424), and the small arm structure (42) and the large arm structure (41) cannot slide relative to each other; A section of the limiting column (731) away from the limiting groove (424) is sleeved with a spring three (732), and an end of the limiting column (731) close to the spring three (732) is fixedly provided with an end seat (733); When the tension structure (72) pulls the release arm (71), the end seat (733) loses pressure, and the limiting column (731) is separated from the limiting groove (424) by the rebound action of the spring three (732), and the small arm structure (42) and the large arm structure (41) can slide relative to each other.

2. A caliper logging tool according to claim 1, characterized in that: The forearm structure (42) comprises a forearm body (421), and a guide column (423) is provided at the upper end of the forearm body (421); The large arm structure (41) is provided with a guide groove (415) for guiding the guide column (423), and the outer sleeve of the guide column (423) is provided with a second spring (10). The second spring (10) is located below the guide groove (415). The second spring (10) is used to reset the small arm structure (42) when it is not subjected to tension.

3. A caliper logging tool according to claim 2, characterized in that: The portion of the small arm body (421) located within the large arm structure (41) is provided with a widened portion (422) toward the side close to the housing (3), and a limiting groove (424) is provided in an area close to the upper end of the widened portion (422). A limiting ridge (425) is provided in an area close to the upper end of the widened portion (422), and a limiting ridge (426) is provided at the other end.

4. A caliper logging tool according to any one of claims 1 to 3, characterized in that: The upper drive assembly (8) comprises: A reel (81), the reel (81) being located in the middle of the housing (3), and the reel (81) being capable of actively rotating; A roller (83), the roller (83) being rotatably mounted on the kingpin (43) via a bearing; A tension rope (82), one end of which is fixed to the upper end of the boom structure (41), and the other end of which is fixed to the reel (81) after being guided by the roller (83).

5. A caliper logging tool according to claim 4, characterized in that: An avoidance groove (414) is provided on the upper arm structure (41) in an area opposite to the roller (83), and the tension rope (82) passes through the avoidance groove (414) and out of the upper arm structure (41).

6. A caliper logging tool according to claim 5, characterized in that: It also includes a faucet (2) and a drive assembly (5), wherein the faucet (2) is assembled on the upper end of the housing (3), and the drive assembly (5) includes: A rotating shaft (53), the rotating shaft (53) is located in the axis region of the housing (3), and the reel (81) is fixed to the lower end of the rotating shaft (53); A support bracket (52) is located in the faucet (2), a main drive motor (51) is provided at the upper end of the support bracket (52), and an upper end of the rotating shaft (53) is fixedly connected to the drive shaft of the main drive motor (51).

7. A caliper logging tool according to claim 6, characterized in that: The upper end of the large arm structure (41) is provided with a cam (413), and a detection component (6) is provided in the faucet (2). When the large arm structure (41) swings along the main pin (43), the cam (413) generates different electrical signals for the detection component (6).

8. A caliper logging tool according to claim 7, characterized in that: It also includes a folding assembly (9), the folding assembly (9) including a threaded portion (91) provided on the rotating shaft (53), and an internal threaded lifting plate (92) threadedly connected to the threaded portion (91), wherein the internal threaded lifting plate (92) moves upward to push the cam (413) upward, thereby folding the logging arm (4); A through slot (31) for the logging arm (4) to be folded is provided on the wall of the shell (3).

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