Hole diameter logging instrument

Abstract

The invention discloses a hole diameter logging instrument, and relates to the technical field of hole diameter measurement. Comprising a housing; the logging arm comprises a large arm structure rotationally arranged on the shell and a small arm structure inserted into one end of the large arm structure, the area, close to the upper end, of the large arm structure is rotationally installed in the shell through a main pin, and a limiting groove is formed in the side face of the section, located in the large arm structure, of the small arm structure; the clamping releasing assembly comprises a clamping releasing arm, a tension structure and a limiting column, the limiting column is arranged in the area, close to the limiting groove, of the large arm structure, and the limiting column can be inserted into the limiting groove when being stressed. Therefore, the force of the well wall on the logging arm is completely converted into the swing force of the logging arm, and the detection precision is improved. When the logging arm is stuck, the upper driving assembly and the jam releasing arm work cooperatively to control the logging arm to be shortened, and therefore jam releasing is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of well diameter measurement, and specifically to a well diameter logging tool. Background Art

[0002] In the field of oilfield logging, the measurement of the irregularity degree of the diameter of the open-hole wellbore is becoming more and more important. By measuring the irregularity degree of the drilling well diameter, the fixed position of the casing when casing is run and the cement dosage parameters required for the cementing operation are selected; also, according to the irregular shape of the borehole, the development degree and direction of the underground rock formation fractures can be analyzed and judged. However, the existing instruments for measuring the change of the open-hole wellbore diameter in the oilfield have low measurement accuracy and can only measure the wellbore diameter in two planes of X and Y, and cannot measure the change of the wellbore diameter from multiple angles, resulting in a large deviation between the measurement result and the actual wellbore shape; in the existing instrument structure, there is no guidance for the part where the measuring arm contacts the well wall, and the measuring arm can only slide axially along the central axis of the instrument, and the length of the measuring arm itself cannot be changed. If there is a pit on the well wall or a radial crack along the well wall, the measuring arm is likely to get stuck in the pit or crack, resulting in the measuring arm being unable to slide axially along the instrument anymore, so that the instrument gets stuck, which brings inconvenience to logging.

[0003] Therefore, a six-arm well diameter logging tool is proposed in the patent with the application number CN201020278065.X. It uses a micro-motion angle sensor with high measurement accuracy, which can more accurately reflect the conditions in the wellbore. And this well diameter logging tool is designed with a free-deflection guide block and a telescopic measuring arm at the part where the measuring arm contacts the well wall, effectively avoiding the phenomenon of getting stuck after the instrument is 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 measuring ratio to deflect, but also cause the telescopic measuring arm itself to expand and contract, thus affecting the measurement result. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a well diameter logging tool, which solves the problem that the force generated by the uneven position on the measuring arm will not only cause the measuring ratio to deflect, but also cause the telescopic measuring arm itself to expand and contract, thus affecting the measurement result.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A well diameter logging tool, comprising: A housing; A logging arm, the logging arm includes a large arm structure rotatably arranged on the housing and a small arm structure inserted at one end of the large arm structure. The area of the large arm structure near the upper end is rotatably installed in the housing through a main pin. A limiting groove is provided on the side surface of a section of the small arm structure located inside the large arm structure; Stuck pipe releasing assembly, the stuck pipe releasing assembly includes a stuck pipe releasing arm, a tension structure and a limit post. The limit post is arranged in the area of the boom structure close to the limit groove. When the limit post is under pressure, it can be inserted into the limit groove to limit the sliding of the forearm structure on the boom structure. A long slot is opened at one end of the stuck pipe releasing arm, and a secondary pin that can be inserted into the long slot is fixed in the area of the boom structure adjacent to the limit post. The tension structure is arranged in the housing and is used to adjust the position of the stuck pipe releasing arm so that the stuck pipe releasing arm applies or does not apply pressure to the limit post; Upper driving assembly, the upper driving assembly is arranged in the housing and is used to apply an upward pulling force to the forearm structure when the limit post disengages from the limit groove, so as to shorten the total length of the logging arm and realize the stuck pipe releasing action.

[0007] Further, when the logging arm is in the natural open state, the tension structure is located at the origin position. At this time, the secondary pin is in the upper area of the long slot, and the limit post is in the middle area of the limit groove; When the forearm structure contacts the uneven position of the wellbore and swings synchronously with the boom structure, the secondary pin can move in the long slot, the limit post can move in the limit groove, and the forearm structure and the boom structure cannot slide relative to each other.

[0008] Further, a spring three is sleeved on a section of the limit post away from the limit groove, and an end seat is fixed at one end of the limit post close to the spring three; When the tension structure pulls the stuck pipe releasing arm, the end seat loses pressure, and the limit post disengages from the limit groove under the action of the spring three's rebound, and the forearm structure and the boom structure can slide relative to each other.

[0009] Further, the forearm structure includes a forearm main body, and a guide post is arranged at the upper end of the forearm main body; A guide groove for guiding the guide post is arranged in the boom structure. A spring two is sleeved outside the guide post, and the spring two is located below the guide groove. The spring two is used for the forearm structure to reset when it is not under tension.

[0010] Further, the part of the forearm main body located in the boom structure is provided with a widened part towards the side close to the housing. The limit groove is opened in the area of the widened part close to the upper end. A limit edge one is arranged in the area of the widened part close to the upper end, and a limit edge two is arranged at the other end.

[0011] Further, the upper driving assembly includes: A reel, the reel is located in the middle of the housing and can rotate actively; A roller, the roller is rotatably arranged on the main pin through a bearing; A pulling rope, one end of the pulling rope is fixed to the upper end of the boom structure, and the other end of the roller is fixed to the reel after being guided by the roller.

[0012] Further, an avoidance groove is formed in the area of the boom structure opposite to the roller, and the tension rope passes through the boom structure from the avoidance groove.

[0013] Further, it further includes a horse head and a driving assembly. The horse head is assembled at the upper end of the housing. The driving assembly includes: A rotating shaft located in the central area of the housing, and a reel is fixed at the lower end of the rotating shaft; A supporting bracket located in the horse head. A main driving motor is provided at the upper end of the supporting bracket, and the upper end of the rotating shaft is fixedly connected to the driving shaft of the main driving motor.

[0014] Further, the upper end of the boom structure is provided as a cam, and a detection assembly is provided in the horse head. When the boom structure swings along the kingpin, the cam forms different electrical signals for the detection assembly.

[0015] Further, it further includes a retracting assembly. The retracting assembly includes a threaded portion provided on the rotating shaft and an internally threaded lifting plate threadedly connected to the threaded portion. When the internally threaded lifting plate moves upward, it can push the cam upward to retract the logging arm. A through groove for retracting the logging arm is formed in the barrel wall of the housing.

[0016] The present invention has the following beneficial effects: For this well diameter logging tool, by setting the pipe releasing assembly, the logging arm can be in a fixed-length and non-free telescopic state during the detection stage, so that all the forces exerted by the well wall on the logging arm are converted into the swinging force of the logging arm, improving the detection accuracy; and when the logging arm is stuck, the upper driving assembly and the pipe releasing arm work together to control the shortening of the logging arm, thereby achieving pipe releasing.

[0017] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the external view of the present invention; Figure 2 is the internal structure schematic diagram of the present invention without the towing hook installed; Figure 3 is the present invention Figure 2 exploded view; Figure 4 is the internal structure schematic diagram of the housing of the present invention; Figure 5 is the present invention Figure 4 front view; Figure 6 is the internal structure schematic diagram of the horse head of the present invention; Figure 7 is the connection external view of the logging arm and the pipe releasing arm of the present invention; Figure 8 For the present invention Figure 7 is a sectional view; Figure 9 is a state diagram of the limiting post of the present invention inserted into the limiting groove; Figure 10 For the present invention Figure 9 is an enlarged view of area A; Figure 11 For the present invention Figure 8 is an exploded view; Figure 12 is a schematic diagram of the internal structure of the boom structure of the present invention; Figure 13 is a state diagram of the logging arm of the present invention in the retracted state; Figure 14 is an arrangement diagram of the driving gear and the driven gear in the lower driving component of the present invention.

[0019] In the figure, 1, towing hook; 2, swivel; 3, housing; 31, through groove; 4, logging arm; 41, boom structure; 411, boom main body; 412, extension part; 413, cam; 414, avoidance groove; 415, guiding groove; 416, accommodating groove; 417, compensation groove; 42, forearm structure; 421, forearm main body; 422, widened part; 423, guiding post; 424, limiting groove; 425, first limiting edge; 426, second limiting edge; 43, main pin; 44, auxiliary pin; 5, driving assembly; 51, main driving motor; 52, supporting bracket; 53, rotating shaft; 6, detection assembly; 61, sliding potentiometer; 62, force-bearing rod; 63, first spring; 64, tray; 7, pipe sticking release assembly; 71, pipe sticking release arm; 711, long groove; 72, tension structure; 721, nut; 722, lead screw; 723, base; 724, pin seat; 725, lower driving component; 73, limiting structure; 731, limiting post; 732, third spring; 733, end seat; 8, upper driving assembly; 81, reel; 82, pulling rope; 83, roller; 9, retracting assembly; 91, threaded part; 92, internally threaded lifting plate; 93, guiding block; 10, second spring. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0022] According to the following Figures 1 - 14 A caliper logging tool provided in an embodiment of the present invention is described.

[0023] 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, both of which are threadedly assembled on the upper end of the faucet 2, and 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.

[0024] like Figure 1 and Figure 2 As shown, a logging arm 4 is assembled on the outer shell 3. Three or four logging arms 4 can be provided. The attached 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 outer shell 3. Each logging arm 4 includes a large arm structure 41 rotatably provided on the outer shell 3 and a small arm structure 42 inserted at one end of the large arm structure 41.

[0025] Combination Figures 2 - 5 As shown, the boom structure 41 includes a boom body 411, and the upper end of the boom body 411 is set to a cam 413 structure. The area near the upper end of the boom body 411 is rotatably installed in the housing 3 through the main pin 43. Preferably, the main pin 43 is located at the junction of the cam 413 and the boom body 411, and a detection component 6 is provided in the malachite 2. When the logging instrument is downhole 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 the uneven position of the well wall, the boom structure 41 and the small arm structure 42 swing on the main pin 43. When they swing, different positions of the cam 413 are aligned with the detection component 6, so that the detection component 6 has different electrical signals.

[0026] like Figure 2 and Figure 6As shown, specifically, the detection component 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 housing 3 and the lower end of the faucet 2 and then enters the faucet 2. A first 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 cam 413 is aligned with the force-bearing rod 62 at different positions, 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.

[0027] Preferably, a tray 64 is also provided on the force-bearing rod 62 for mounting the first spring 63.

[0028] As Figure 4 、 Figure 7 and Figure 8 shown, in order to prevent the logging arm 4 from being stuck during the downhole caliper measurement, a releasing component 7 is also provided here. A limiting groove 424 is opened on a side of a section of the small arm structure 42 located inside the large arm structure 41 for cooperating with the releasing component 7. And an extension part 412 extends from the lower end of the large arm main body 411 near the housing 3 for accommodating part of the releasing component 7. The above-mentioned releasing component 7 includes a releasing arm 71, a tension structure 72 and a limiting structure 73. The limiting structure 73 includes a limiting post 731.

[0029] Specifically, in combination with Figures 7 - 12 shown, the limiting post 731 is arranged in a region of the large arm structure 41 close to the limiting groove 424, specifically arranged inside the extension part 412. When the limiting post 731 is under pressure, it can be inserted into the limiting groove 424, thereby restricting the sliding of the small arm structure 42 on the large arm structure 41. At this time, the small arm structure 42 and the large arm structure 41 are of an integral structure, and the two can swing synchronously and cannot be telescoped, so as to ensure that the uneven change amount of the wellbore wall can be transmitted to the cam 413 in the form of the swing of the small arm structure 42 on the large arm structure 41; A long groove 711 is opened at one end of the releasing arm 71. A secondary pin 44 that can be inserted into the long groove 711 is fixed in a region of the large arm structure 41 adjacent to the limiting post 731. The tension structure 72 is arranged inside the housing 3.

[0030] When the limit post 731 is inserted into the limit slot 424 and the forearm structure 42 swings integrally with the large arm structure 41, it can drive the secondary pin 44 to slide in the long slot 711, so that the forearm structure 42 and the large arm structure 41 are not blocked by the unlocking arm 71 during swinging, enabling them to swing freely. The tension structure 72 can adjust the position of the unlocking arm 71 to apply or not apply pressure to the limit post 731. In the well logging state where the well logging arm 4 is opened, the tension structure 72 is located at the origin position. At this time, the secondary pin 44 is in the middle area of the long slot 711, and the unlocking arm 71 applies pressure to the limit post 731, making the limit post 731 in the middle area of the limit slot 424. When the forearm structure 42 touches the uneven position of the well wall and swings synchronously with the large arm structure 41, the secondary pin 44 can move in the long slot 711, and the limit post 731 can move in the limit slot 424. However, this displacement is within a reasonable range. Therefore, even if the position of the limit post 731 changes relative to the limit slot 424, the limit post 731 is still located within the limit slot 424, so that the forearm structure 42 and the large arm structure 41 maintain a state of non-relative sliding and fixed length. When the well logging arm 4 encounters a large obstacle or the deformation of the well wall is too severe, the tension structure 72 is activated. At this time, the tension structure 72 pulls the unlocking arm 71, so that the upper end of the long slot 711 contacts the limit post 731. Thus, after the limit post 731 loses pressure, it can disengage from the limit slot 424. At this time, the forearm main body 421 and the large arm main body 411 are unlocked, and the forearm main body 421 can slide within the large arm main body 411, so that the length of the entire well logging arm 4 can be shortened, thereby achieving the purpose of unlocking.

[0031] It should be noted that when the well logging arm 4 swings outward to the maximum angle (this maximum angle is determined by the first spring 63. When the first spring 63 extends to its maximum extendable length, it is when the well logging arm 4 swings outward to the maximum angle), the secondary pin 44 has not reached the uppermost end of the long slot 711. Although the pressure of the unlocking arm 71 on the limit post 731 decreases, the limit post 731 is still located within the limit slot 424. However, when the tension structure 72 is driven to pull down the unlocking arm 71, the secondary pin 44 can reach the uppermost end of the long slot 711. At this time, the pressure of the unlocking arm 71 on the limit post 731 reaches the minimum, and the limit post 731 completely disengages from the limit slot 424.

[0032] As Figure 4 and Figure 14 shown, the above-mentioned tension structure 72 includes a base 723 and a lead screw 722. The base 723 is located at the bottom inside the housing 3. The lead screw 722 is rotatably installed on the base 723. A nut 721 is threadedly connected to the lead screw 722. A pin seat 724 is provided on one side of the nut 721. The lower end of the unlocking arm 71 is hinged to the pin seat 724. When the lead screw 722 rotates, it can drive the nut 721 to move downward, thereby pulling down the lower end of the unlocking arm 71.

[0033] Referring toFigure 13 and Figure 14 As shown in Figure 14 , for the lower drive component 725 of the driven lead screw 722: a driving gear is arranged below the base 723, driven gears are arranged at the lower ends of the respective lead screws 722, the respective driven gears are engaged with the driving gear, and a motor is arranged below the base 723 for driving the driving gear to rotate; of course, the tension structure 72 in the present invention is not limited to the structure in this embodiment, as long as the purpose of pulling the lower end of the unlocking arm 71 can be achieved.

[0034] Combined with 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 for applying an upward pulling force to the small arm structure 42 after the limit post 731 disengages from the limit groove 424, so as to shorten the total length of the logging arm 4 and achieve the unlocking action.

[0035] Preferably, as shown in Figures 8 - 11 , in order to enable the limit post 731 to automatically disengage from the limit groove 424 when the unlocking arm 71 loses pressure on the limit post 731, a third spring 732 is sleeved on a section away from the limit groove 424, and a end seat 733 is fixedly arranged at one end of the limit post 731 close to the third spring 732. The end seat 733 is in direct contact with the unlocking arm 71. When the unlocking arm 71 generates pressure on the end seat 733, the third spring 732 is in a compressed state. Thus, when the tension structure 72 pulls the unlocking arm 71, the end seat 733 loses pressure, and the limit post 731 disengages from the limit groove 424 under the action of the rebound of the third spring 732, and the small arm structure 42 and the large arm structure 41 can slide relative to each other.

[0036] In addition, a compensation groove 417 for accommodating the unlocking arm 71 is arranged in the extension part 412.

[0037] Next, the insertion position relationship between the small arm structure 42 and the large arm structure 41 will be specifically described. Here, the small arm structure 42 includes a small arm main body 421. An accommodation groove 416 for accommodating the small arm main body 421 is arranged in the large arm main body 411 and the extension part 412. A guide post 423 is arranged at the upper end of the small arm main body 421. A guide groove 415 for guiding the guide post 423 is arranged in the large arm main body 411. A second spring 10 is sleeved on the periphery of the guide post 423. The second spring 10 is located below the guide groove 415. When the small arm structure 42 is subjected to the pulling force of the upper drive assembly 8, it moves upward along the axis, and the second spring 10 is in a compressed state. On the contrary, when the small arm structure 42 loses the pulling force of the upper drive assembly 8, the second spring 10 can push the small arm structure 42 to reset.

[0038] Preferably, a widened portion 422 is provided on the portion of the forearm main body 421 located inside the upper arm structure 41 toward the side close to the housing 3. The limiting groove 424 is opened in the area close to the upper end of the widened portion 422. A first limiting edge 425 is provided in the area close to the upper end of the widened portion 422, and a second limiting edge 426 is provided at the other end. When the forearm structure 42 is subjected to the pulling force of the upper driving assembly 8, the limiting post 731 slides on the outer surface of the widened portion 422 until the second limiting edge 426 reaches the position of the limiting post 731. At this time, the forearm structure 42 no longer moves upward, and the first limiting edge 425 is used to limit the reset area of the forearm structure 42 when the second spring 10 pushes the forearm structure 42 to reset, avoiding excessive resetting.

[0039] Combined with Figure 8 and Figure 11 As shown, the above-mentioned upper driving assembly 8 includes a winding wheel 81, a roller 83 and a pulling rope 82. The winding wheel 81 is located in the middle of the housing 3, and the winding wheel 81 can rotate actively. The roller 83 is rotatably arranged on the kingpin 43 through a bearing. One end of the pulling rope 82 is fixed to the upper end of the upper arm structure 41, and the other end of the pulling rope 82 is fixed to the winding wheel 81 after being guided by the roller 83.

[0040] In this implementation scheme, when the winding wheel 81 rotates, it can wind up the pulling rope 82, so as to apply a pulling force to the forearm structure 42, and vice versa.

[0041] It should be noted that a total of four winding wheels 81 are provided, each pulling rope 82 is matched with a winding wheel 81, and the four winding wheels 81 are coaxial and rotate synchronously, that is, when one of the logging arms 4 is stuck, the four logging arms 4 are unjammed simultaneously.

[0042] Preferably, in order to ensure that the pulling rope 82 only generates a pulling force 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 of the upper arm structure 41 opposite to the roller 83, and the pulling rope 82 passes through the avoidance groove 414 and penetrates the upper arm structure 41.

[0043] Referring to Figure 2 and Figure 3 As shown, a driving assembly 5 is further provided in the swivel head 2. The driving assembly 5 includes a rotating shaft 53 and a support bracket 52. The rotating shaft 53 is located in the central area of the housing 3. The winding wheel 81 is fixed to the lower end of the rotating shaft 53. The support bracket 52 is located in the swivel head 2. A main driving motor 51 is provided at the upper end of the support bracket 52. The upper end of the rotating shaft 53 is fixedly connected to the driving shaft of the main driving motor 51. Thus, when the main driving motor 51 works, the rotating shaft 53 can drive the winding wheel 81 to rotate.

[0044] Combined with Figures 2 - 4, after the logging is completed, the logging arm 4 needs to be retracted and the device needs to be retrieved. Therefore, a retracting assembly 9 is also provided here. The retracting 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. When the internally threaded lifting plate 92 moves upward, it can push the cam 413 upward to retract the logging arm 4. A through groove 31 for retracting the logging arm 4 is provided on the barrel wall of the outer shell 3.

[0045] Preferably, a guide block 93 is provided on the side of the periphery of the internally threaded lifting plate 92 avoiding the area of the logging arm 4, and a guide rail is provided on the inner wall of the outer shell 3 in the area opposite to the guide block 93. The guide rail is arranged along the axial direction of the outer shell 3.

[0046] It should be noted that during the above-mentioned stuck pipe releasing action (when the upper driving assembly 8 pulls the small arm structure 42 upward), the internally threaded lifting plate 92 rises synchronously. Therefore, in order to avoid the phenomenon of re-sticking caused by the internally threaded lifting plate 92 pushing the cam 413 to rotate the logging arm 4 during the process of the small arm structure 42 moving upward to release the stuck pipe, the initial position of the internally 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 a small distance. During this process, the internally threaded lifting plate 92 moves upward but does not lift the cam 413; subsequently, the small arm structure 42 continues to move upward, and the internally threaded lifting plate 92 begins to lift the cam 413, so that in addition to the small arm structure 42 moving upward, the entire logging arm 4 will also rotate and retract, and finally form Figure 13 the state shown.

[0047] During use (when working), when the device is lowered into the well, the logging arm 4 is Figure 5 in the open state shown. At this time, the limit post 731 is located in the limit groove 424 under the extrusion of the stuck pipe releasing arm 71, so that the large arm structure 41 and the small arm structure 42 are in a mutually locked state. When encountering an uneven position on the well wall, the large arm structure 41 and the small arm structure 42 swing on the main pin 43. When they swing, the pressure on the force receiving rod 62 is different when different positions of the cam 413 are aligned with the force receiving rod 62, so that the force receiving rod 62 pushes the sliding component of the sliding potentiometer 61 to different degrees, forming different electrical signals to represent the detection results.

[0048] When the forearm structure 42 contacts the uneven position of the wellbore wall and swings synchronously with the upper arm structure 41, the secondary pin 44 can move within the long slot 711, and the limit post 731 can move within the limit slot 424. However, this displacement is within a reasonable range. Therefore, even if the position of the limit post 731 changes relative to the limit slot 424, the limit post 731 still remains within the limit slot 424. As a result, the forearm structure 42 and the upper arm structure 41 maintain a state where they cannot slide relative to each other and have a fixed length. The state of maintaining a fixed length can ensure that all the wellbore wall thrust received by the forearm structure 42 is transmitted to the cam 413, improving the detection accuracy.

[0049] When encountering a large obstacle, the forearm structure 42 will become stuck. At this time, first control the tension structure 72 to work. At this time, the tension structure 72 pulls the unlocking arm 71, so that the upper end of the long slot 711 contacts the limit post 731, greatly reducing the pressure of the unlocking arm 71 on the limit post 731. As a result, after the limit post 731 loses pressure, it can disengage from the limit slot 424. At this time, the forearm main body 421 and the upper arm main body 411 are unlocked. Then control the main drive motor 51 to work, so that the rotating shaft 53 rotates. When the rotating shaft 53 rotates, first apply a pulling force to the forearm structure 42 through the pulling rope 82, causing the second spring 10 to contract, and the forearm structure 42 moves upward a small distance, so that the forearm structure 42 axially disengages from the obstacle first. During this process, the internally threaded lifting plate 92 moves upward but does not lift the cam 413. Subsequently, the forearm structure 42 continues to move upward, and the internally threaded lifting plate 92 begins to lift the cam 413, so that in addition to the forearm structure 42 moving upward during this process, the entire logging arm 4 will also rotate and fold. When it folds, the secondary pin 44 moves to the lowermost end of the long slot 711, and finally forms Figure 13 the state shown, and the stuck can be released.

[0050] It should be noted that in this article, relational terms such as first and second are only used 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 term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0051] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A borehole diameter logging tool, characterized in that, Comprising: A housing (3); A logging arm (4), the 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). The area of the large arm structure (41) near the upper end is rotatably installed in the housing (3) through a main pin (43). A limiting groove (424) is provided on the side of a section of the small arm structure (42) located inside the large arm structure (41); A stuck pipe releasing assembly (7), the stuck pipe releasing assembly (7) includes a stuck pipe releasing arm (71), a tension structure (72) and a limiting post (731). The limiting post (731) is provided in the area of the large arm structure (41) near the limiting groove (424). When the limiting post (731) is under pressure, it can be inserted into the limiting groove (424) to limit the sliding of the small arm structure (42) on the large arm structure (41). A long groove (711) is provided at one end of the stuck pipe releasing arm (71). A secondary pin (44) that can be inserted into the long groove (711) is fixed in the area of the large arm structure (41) adjacent to the limiting post (731). The tension structure (72) is provided inside the housing (3) and is used to adjust the position of the stuck pipe releasing arm (71) so that the stuck pipe releasing arm (71) applies or does not apply pressure to the limiting post (731); An upper driving assembly (8), the upper driving assembly (8) is provided inside the housing (3) and is used to apply an upward pulling force to the small arm structure (42) when the limiting post (731) disengages from the limiting groove (424), so as to shorten the total length of the logging arm (4) and achieve the stuck pipe releasing action.

2. The well diameter logging tool according to claim 1, characterized in that: When the logging arm (4) is in the natural open state, the tension structure (72) is at the origin position. At this time, the secondary pin (44) is in the upper area of the long groove (711), and the limiting post (731) is in the middle area of the limiting groove (424); When the small arm structure (42) contacts the uneven position of the wellbore wall and swings synchronously with the large arm structure (41), the secondary pin (44) can move in the long groove (711), and the limiting post (731) can move in the limiting groove (424). The small arm structure (42) and the large arm structure (41) cannot slide relative to each other.

3. The caliper logging tool according to claim 2, characterized in that: A third spring (732) is sleeved on a section of the limiting post (731) away from the limiting groove (424), and an end seat (733) is fixedly provided at one end of the limiting post (731) close to the third spring (732); When the tension structure (72) pulls the stuck pipe releasing arm (71), the end seat (733) loses pressure. Under the action of the rebound of the third spring (732), the limiting post (731) disengages from the limiting groove (424), and the small arm structure (42) and the large arm structure (41) can slide relative to each other.

4. The caliper logging tool according to claim 3, characterized in that: The small arm structure (42) includes a small arm main body (421), and a guiding post (423) is provided at the upper end of the small arm main body (421); A guiding groove (415) for guiding the guiding post (423) is provided inside the large arm structure (41). A second spring (10) is sleeved on the periphery of the guiding post (423). The second spring (10) is located below the guiding groove (415), and the second spring (10) is used for the small arm structure (42) to reset when not under tension.

5. The well diameter logging tool according to claim 4, characterized in that: The part of the forearm main body (421) located inside the upper arm structure (41) is provided with a widened part (422) on the side closer to the outer shell (3). A limiting groove (424) is opened in the area near the upper end of the widened part (422). The area near the upper end of the widened part (422) is provided with a first limiting edge (425), and the other end is provided with a second limiting edge (426).

6. A caliper logging tool according to any one of claims 1-5, characterized in that: The upper driving assembly (8) includes: A winding wheel (81) which is located in the middle of the outer shell (3) and can rotate actively; A roller (83) which is rotatably arranged on the kingpin (43) through a bearing; A pulling rope (82), one end of which is fixed to the upper end of the upper arm structure (41), and the other end of the roller (83) is fixed to the winding wheel (81) after being guided by the roller (83).

7. The caliper logging tool according to claim 6, wherein: An avoidance groove (414) is opened in the area of the upper arm structure (41) opposite to the roller (83), and the pulling rope (82) passes through the avoidance groove (414) and penetrates out of the upper arm structure (41).

8. The caliper logging tool according to claim 7, characterized in that: It further includes a hose coupling head (2) and a driving assembly (5). The hose coupling head (2) is assembled at the upper end of the outer shell (3). The driving assembly (5) includes: A rotating shaft (53) which is located in the central area of the outer shell (3), and the winding wheel (81) is fixed to the lower end of the rotating shaft (53); A supporting bracket (52) which is located inside the hose coupling head (2). The upper end of the supporting bracket (52) is provided with a main driving motor (51), and the upper end of the rotating shaft (53) is fixedly connected to the driving shaft of the main driving motor (51).

9. The caliper logging tool according to claim 8, wherein: The upper end of the upper arm structure (41) is provided as a cam (413). A detection assembly (6) is arranged inside the hose coupling head (2). When the upper arm structure (41) swings along the kingpin (43), the cam (413) forms different electrical signals for the detection assembly (6).

10. The caliper logging tool according to claim 9, wherein: It further includes a retracting assembly (9). The retracting assembly (9) includes a threaded part (91) arranged on the rotating shaft (53) and an internally threaded lifting plate (92) threadedly connected to the threaded part (91). When the internally threaded lifting plate (92) moves upward, it can push the cam (413) upward to retract the logging arm (4); A through groove (31) for the logging arm (4) to retract is opened on the barrel wall of the outer shell (3).

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