Telescopic short joint for underground hole depth detection

Abstract

The invention relates to the technical field of telescopic short joints, and particularly discloses a telescopic short joint for underground hole depth detection, which comprises a fixed joint and a fixed column, a hollow cavity is formed in the fixed joint, a limiting block is fixedly connected to the bottom of one side of the inner wall of the hollow cavity, a movable joint is slidably connected to the hollow cavity in the vertical direction, and a through hole is formed in the center of the movable joint in a penetrating manner; the middle of the movable joint is fixedly connected with an annular block slidably connected to the bottom of the hollow cavity, a rotary telescopic mechanism is arranged on the side wall of the annular block, the bottom end of the movable joint is fixedly connected with a fixed column, and placing grooves are symmetrically formed in the two side walls of the fixed column. And a fixing mechanism is arranged in the fixing column on one side of the movable block. The telescopic short joint rotates through the movable joint, so that the detection instrument can perform dead-angle-free detection on an underground hole, and the movable joint and the fixed column drive the detection instrument to contract, so that the overall length is reduced, and the detection instrument can conveniently pass through a bent part in the hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of telescopic short sections, in particular to a telescopic short section for downhole hole depth detection. BACKGROUND

[0002] In the field of oil drilling and geological exploration, the use of downhole instruments and connecting short sections is the key to achieving efficient drilling operations, providing strong support for the exploration and development of oil and gas resources. By reasonably selecting and using downhole instruments and connecting short sections, the efficiency and safety of drilling operations can be significantly improved.

[0003] In the process of connecting the downhole instrument into the hole hole for depth detection and sampling, the connecting short section and the downhole instrument are prone to jamming during the downhole process due to the influence of the curved wellbore. After jamming, the operator often needs to adjust the connecting short section and the downhole instrument up and down through external equipment, which slows down the lowering speed of the connecting short section and the downhole instrument, affecting the detection efficiency of the downhole instrument at the specified depth. At the same time, when the connecting short section is stuck in the curved wellbore, it affects the subsequent use of the wellbore and causes loss of the downhole instrument. When the downhole instrument samples the well wall, the connecting short section and the downhole instrument are prone to shaking, making sampling inconvenient. SUMMARY

[0004] The purpose of the present application is to solve the problems existing in the prior art and provide a telescopic short section for downhole hole depth detection.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A telescopic short section for downhole hole depth detection, comprising a fixed section and a fixed column, a hollow cavity is formed in the fixed section, a limiting block is fixedly connected to the inner wall of the hollow cavity on one side of the bottom, a movable section is vertically slidably connected in the hollow cavity, a through hole is formed through the center of the movable section, a connecting rod is slidably connected in the through hole, an annular block is fixedly connected to the middle of the movable section and slidably connected to the bottom of the hollow cavity, a rotary telescopic mechanism comprising an annular groove is arranged on the side wall of the annular block, a fixed column is fixedly connected to the bottom end of the movable section, a placing groove is symmetrically formed in the side wall of the fixed column, an active block is fixedly connected to the bottom end of the connecting rod, and a fixing mechanism comprising a supporting leg is arranged in the fixed column on one side of the active block.

[0007] The side wall of the annular block is provided with an annular groove, the limiting block is slidably connected with the annular groove, a first slot is formed in the bottom of one side of the annular groove, the first slot is matched with the limiting block, a second slot is formed in the top of the annular groove above the first slot, the top end of a spring is fixedly arranged on the inner wall of the hollow cavity, and the bottom end of the spring abuts against the top end of the annular block.

[0008] The movable block is fixedly connected with two symmetrical push rods on one side, two rotating blocks are rotatably connected on the top of the two placing grooves, the bottom of the rotating block is fixedly connected with a supporting leg, a rotating shaft on one side of the rotating block is rotatably connected with a rotating rod through an extension support, a rectangular groove is formed in the top of the rotating rod, the bottom of the pull spring is fixedly connected with the top of the rectangular groove, the top of the pull spring is fixedly connected with the inside of the movable joint, and the two push rods are movably connected with the two rectangular grooves respectively.

[0009] Preferably, a guide strip is fixedly connected to the inner wall of the hollow cavity directly above the limiting block, the guide strip is matched with the second slot, and the depth of the second slot is smaller than that of the first slot.

[0010] Preferably, a first connecting joint is fixedly connected to the top of the fixed joint, the inner ring of the first connecting joint is threadedly connected with the hollow connector through the thread formed therein, and the top of the hollow connector is fixedly connected with an external conveying device.

[0011] Preferably, a sunken groove is formed in the bottom outer wall of the fixed joint, a sleeve is fixedly connected to the top of the fixed column, and the top of the sleeve is slidably connected with the bottom of the sunken groove.

[0012] Preferably, a connecting thread is formed in the top of the movable joint, four clamping grooves are uniformly formed in the movable joint around the top of the connecting thread, a clamping block is slidably connected in the clamping groove, and a first connecting ring is fixedly connected to the top of the four clamping blocks.

[0013] Preferably, a thread is formed in the bottom inner wall of the first connecting ring, the top of a ring-shaped connecting block is threadedly connected with the bottom inner wall of the first connecting ring, the bottom of the ring-shaped connecting block is threadedly connected with the connecting thread, a second connecting ring is fixedly connected to the top of the first connecting ring through bolts, and the top of the second connecting ring is connected with an external driving device.

[0014] Preferably, a limiting groove is formed in the side wall of the movable block away from the push rod, and a limiting block matched with the limiting groove is fixedly connected to the bottom inner wall of the through hole on one side of the limiting groove.

[0015] Preferably, a top plate is rotatably connected to the bottom outer side of the supporting leg, a weight is fixedly connected to the bottom of the top plate close to one side of the supporting leg, and a magnet is fixedly connected to the top of the top plate close to one side of the supporting leg.

[0016] Preferably, a second connecting joint is fixedly connected to the bottom end of the fixed column, and the second connecting joint is fixedly connected with a measuring instrument through the thread formed in the bottom.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] The present application sets up the rotary telescopic mechanism, the telescopic section rotates along the hollow cavity of the fixed section fixed on the external conveying equipment through the movable movable section, and the movable section and the detection instrument are kept stable during rotation through the annular groove and the limiting block for limiting, so that the detection instrument can detect the 360-degree dead angle-free hole in the detection process, and the subsequent fixing mechanism can also effectively sample at different angles when sampling the detection instrument, the rotary telescopic mechanism can also rotate the first slot and the second slot to the upper side of the limiting block and the guide strip through the rotation of the movable section, and then pull the movable section to make the annular block separate from the limiting block, at this time, the movable section and the fixed column can be pulled to drive the detection instrument to shrink, so that the overall length is reduced to facilitate passing through the hole bending.

[0019] The present application sets up the fixing mechanism, the fixing mechanism drives the two rotating rods to push the rectangular slot at the top of the rotating rod to indirectly drive the two rotating blocks and the supporting legs to rotate and separate from the placing slot to expand, so that the two supporting legs abut against the hole inner wall to cooperate with the external conveying equipment to firmly fix the telescopic section and the detection instrument in the hole, at this time, the detection instrument can be detected in detail and sampled in the hole without shaking due to unbalanced stress, ensuring the sampling stability and equipment safety, after sampling, the supporting leg and the top plate can be reset without affecting the subsequent lowering detection operation, and the fixing mechanism can also drive one of the two rotating rods to penetrate the rectangular slot and the other rotating rod to separate from the rectangular slot through the rotation of the connecting rod, at this time, pushing the connecting rod can make one rotating rod push one rotating rod to make one supporting leg expand and abut against the hole inner wall, when the telescopic section cannot pass through the bending place smoothly after shrinking, the top plate of one supporting leg can be abutted against the inner wall of the hole bending direction opposite place, at this time, the supporting leg provides a supporting force to make the telescopic section and the detection instrument supported without directly rubbing with the hole bending place, so that the telescopic section can pass through the bending place more conveniently under the pushing of the external conveying equipment without damaging the detection equipment, so that the passability of the telescopic section is greatly improved.

[0020] The present application sets the first connecting ring, the second connecting ring and the hollow joint, the external conveying equipment is connected with the outer ring of the hollow joint, which is used for conveying the integral telescopic section, and the hollow joint can also protect the internal second connecting ring and the external driving equipment, etc., preventing the equipment from being damaged in the hole, the annular connecting block is used to threadedly connect the first connecting ring and the second connecting ring, and the first connecting ring and the second connecting ring are the mutually symmetrical funnel-shaped structures, so that the first connecting ring and the second connecting ring can be connected with the first external driving equipment before being fixed and connected, providing the operation space, and then the first connecting ring and the second connecting ring are fixed by the bolts, which can protect the internal equipment, and the equipment such as the first connecting ring, the second connecting ring, the annular connecting block and the connecting rod does not interfere with each other when being installed layer by layer, ensuring the stable function of each component, realizing the integration of various driving modes, saving the installation space, and being reasonable and convenient in the installation structure. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The present application proposes a whole structure schematic diagram of the telescopic section for the downhole hole depth detection;

[0022] Figure 2 The present application proposes a hollow joint structure schematic diagram of the telescopic section for the downhole hole depth detection;

[0023] Figure 3 The present application proposes a first connecting section structure schematic diagram of the telescopic section for the downhole hole depth detection;

[0024] Figure 4 The present application proposes a telescopic mechanism structure schematic diagram of the telescopic section for the downhole hole depth detection;

[0025] Figure 5 The present application proposes a movable section structure schematic diagram of the telescopic section for the downhole hole depth detection;

[0026] Figure 6 The present application proposes a fixed column structure schematic diagram of the telescopic section for the downhole hole depth detection;

[0027] Figure 7 The present application proposes a Figure 6 The enlarged view of the region A in the middle;

[0028] Figure 8 The present application proposes a Figure 6 The enlarged view of the region B in the middle;

[0029] Figure 9A first connecting ring and a second connecting ring structure sectional view of a telescopic nipple for borehole depth detection according to the present application;

[0030] Figure 10 A connecting rod structure schematic diagram of a telescopic nipple for borehole depth detection according to the present application;

[0031] Figure 11 A telescopic nipple for borehole depth detection according to the present application Figure 10 A region structure enlarged view at C;

[0032] Figure 12 A movable block structure schematic diagram of a telescopic nipple for borehole depth detection according to the present application;

[0033] Figure 13 A top plate structure schematic diagram of a telescopic nipple for borehole depth detection according to the present application.

[0034] In the figure: 1, fixed nipple; 2, hollow cavity; 3, limit block; 4, guide strip; 5, spring; 6, subsidence groove; 7, first connecting nipple; 8, hollow joint; 9, movable nipple; 10, annular block; 11, rotary telescopic mechanism; 12, annular groove; 13, first slot; 14, second slot; 15, connecting thread; 16, clamping groove; 17, first connecting ring; 18, clamping block; 19, annular connecting block; 20, second connecting ring; 21, through hole; 22, fixed column; 221, sleeve; 23, placement groove; 24, connecting rod; 25, movable block; 26, limit groove; 27, push rod; 28, fixing mechanism; 29, tension spring; 30, rotating block; 31, supporting leg; 32, top plate; 33, weight; 34, magnet; 35, rotating rod; 36, rectangular groove; 37, second connecting nipple. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0036] Reference Figures 1-13A retractable short section for borehole depth detection, comprising a fixed section 1 and a fixed column 22, a hollow cavity 2 is formed in the fixed section 1, a limiting block 3 is fixedly connected to the inner wall of the hollow cavity 2, the hollow cavity 2 is vertically slidably connected with a movable section 9, a through hole 21 is formed in the center of the movable section 9, a connecting rod 24 is slidably connected in the through hole 21, an annular block 10 is fixedly connected to the middle of the movable section 9 and slidably connected to the bottom of the hollow cavity 2, a rotary telescopic mechanism 11 comprising an annular groove 12 is arranged on the side wall of the annular block 10, the fixed column 22 is fixedly connected to the bottom end of the movable section 9, the two side walls of the fixed column 22 are symmetrically provided with a placing groove 23, the bottom end of the connecting rod 24 is fixedly connected with a movable block 25, and the inside of the fixed column 22 on one side of the movable block 25 is provided with a fixing mechanism 28 comprising a supporting leg 31.

[0037] The side wall of the annular block 10 is provided with an annular groove 12, the limiting block 3 is slidably connected with the annular groove 12, a first slot 13 is formed in the bottom of one side of the annular groove 12, the first slot 13 is matched with the limiting block 3, a second slot 14 is formed in the top of the annular groove 12 above the first slot 13, the top end of a spring 5 is fixedly arranged on the top of the inner wall of the hollow cavity 2, and the bottom end of the spring 5 abuts against the top end of the annular block 10.

[0038] The movable block 25 is fixedly connected with two symmetrical push rods 27 on one side, the top of the two placing grooves 23 is rotatably connected with a rotating block 30, the bottom of the rotating block 30 is fixedly connected with a supporting leg 31, the rotating shaft of the rotating block 30 is rotatably connected with a rotating rod 35 through an extension support on one side, the top of the rotating rod 35 is provided with a rectangular groove 36, the bottom of the pull spring 29 is fixedly connected with the top of the rectangular groove 36, the top of the pull spring 29 is fixedly connected with the inside of the movable joint 9, and the two push rods 27 are movably connected with the two rectangular grooves 36 respectively. The telescopic short section is rotated along the hollow cavity 2 of the fixed joint 1 fixedly arranged on the external conveying equipment through the movable movable joint 9, and the rotating block 9 and the detection instrument are kept stable during rotation through the annular groove 12 and the limiting block 3 for limiting, so that the detection instrument can detect the downhole hole in 360 degrees without dead angle during detection, and the subsequent fixing mechanism 28 can also effectively sample at different angles when sampling the detection instrument. The rotating telescopic mechanism 11 can also rotate the first slot 13 and the second slot 14 to the top of the limiting block 3 and the guide strip 4 by rotating the movable joint 9, and then pulling the movable joint 9 can make the annular block 10 separate from the limiting block 3. At this time, the movable joint 9 and the fixed column 22 can be pulled to drive the detection instrument to shrink, so that the overall length can be reduced to facilitate passing through the bending part in the hole. The fixing mechanism 28 drives the two push rods 27 to push the rectangular groove 36 at the top of the rotating rod 35 through the push connecting rod 24, indirectly drives the two rotating blocks 30 and the supporting legs 31 to rotate and separate from the placing groove 23, and then expands, so that the two supporting legs 31 abut against the inner wall of the hole, and then the telescopic short section and the detection instrument are fixed in the hole by the external conveying equipment. At this time, the detection instrument can be detected in detail and sampled in the hole without shaking due to unbalanced force, so as to ensure the sampling stability and equipment safety. After sampling, the supporting leg 31 and the top plate 32 can be reset, without affecting the subsequent lowering and detection operation. The fixing mechanism 28 can also make one of the two push rods 27 penetrate into the rectangular groove 36 by rotating the connecting rod 24, and the other push rod 27 separates from the rectangular groove 36. At this time, pushing the connecting rod 24 can make one push rod 27 push one rotating rod 35, so that one supporting leg 31 expands and abuts against the inner wall of the hole. When the telescopic short section cannot pass through the bending part smoothly after the movable joint 9 is retracted, the top plate 32 of one supporting leg 31 abuts against the inner wall of the hole in the opposite direction of the bending direction, so that the telescopic short section and the detection instrument are supported without directly rubbing with the bending part of the hole, so that the telescopic short section can pass through the bending part more conveniently under the pushing of the external conveying equipment, without damaging the detection equipment, so that the passability of the telescopic short section is greatly improved.

[0039] As a technical optimization scheme of the present application, the hollow cavity 2 above the limiting block 3 is fixedly connected with a guide strip 4 on the inner wall, the guide strip 4 is matched with the second slot 14, and the depth of the second slot 14 is smaller than that of the first slot 13. The first slot 13 and the second slot 14 are respectively convenient for the annular block 10 to separate from the limiting block 3 and slide along the guide strip 4, so that the movable joint 9 can rotate and retract, and no interference occurs.

[0040] As a technical optimization scheme of the present application, the top end of the fixed joint 1 is fixedly connected with a first connecting joint 7, the inner circle of the first connecting joint 7 is threadedly connected with a hollow joint 8 through a thread, and the top of the hollow joint 8 is fixedly connected with an external conveying device. The external conveying device is connected with the outer circle of the hollow joint 8, is used for conveying the overall telescopic short joint, and the hollow joint 8 can also protect the internal second connecting ring 20 and the external driving device, so as to prevent the device from being damaged in the eyelet.

[0041] As a technical optimization scheme of the present application, the bottom outer wall of the fixed joint 1 is provided with a sunken groove 6, the top end of the fixed column 22 is fixedly connected with an annular sleeve 221, and the top of the sleeve 221 is slidingly connected with the bottom of the sunken groove 6. When the movable joint 9 is retracted, the sleeve 221 slides along the sunken groove 6, and is also used for protecting the movable joint 9.

[0042] As a technical optimization scheme of the present application, the top of the movable joint 9 is provided with a connecting thread 15, the movable joint 9 around the top of the connecting thread 15 is uniformly provided with four clamping grooves 16, the clamping grooves 16 are slidingly connected with clamping blocks 18, and the top end of the four clamping blocks 18 is fixedly connected with a first connecting ring 17. The first connecting ring 17 is clamped with the clamping blocks 18 and the clamping grooves 16, so that the second external driving device can drive the movable joint 9 to rotate synchronously in the process of rotating the movable joint 9.

[0043] As a technical optimization scheme of the present application, a thread is formed in the inner wall of the bottom of the first connecting ring 17, the top of an annular connecting block 19 is connected to the inner wall of the bottom of the first connecting ring 17 in a threaded manner, the bottom of the annular connecting block 19 is connected to the connecting thread 15 in a threaded manner, the top end of the first connecting ring 17 is fixedly connected to a second connecting ring 20 through a bolt, and the top end of the second connecting ring 20 is connected to an external driving device. The annular connecting block 19 is used to threadedly connect the first connecting ring 17 and the second connecting ring 20, and the first connecting ring 17 and the second connecting ring 20 are funnel-shaped structures that are symmetrical to each other, so that the first connecting ring 17 and the second connecting ring 20 can be conveniently connected to the first external driving device before being fixedly connected, an operation space is provided, then the first connecting ring 17 and the second connecting ring 20 are fixedly connected through a bolt, the internal device is protected, and the devices such as the first connecting ring 17, the second connecting ring 20, the annular connecting block 19 and the connecting rod 24 do not interfere with each other while being installed in layers, the functions of the components are stable, the integration of various driving modes is realized, the installation space is saved, and the installation structure is reasonable and convenient.

[0044] As a technical optimization scheme of the present application, a limiting groove 26 is formed in the side wall of the movable block 25 away from the lever 27, and a limiting block matched with the limiting groove 26 is fixedly connected to the bottom inner wall of the through hole 21 on one side of the limiting groove 26. The limiting groove 26 cooperates with the limiting block to control the rotation angle of the movable block 25.

[0045] As a technical optimization scheme of the present application, the bottom outer side of the supporting leg 31 is rotationally connected to a top plate 32, the bottom of the top plate 32 close to one side of the supporting leg 31 is fixedly connected to a weight 33, and the top of the top plate 32 close to one side of the supporting leg 31 is fixedly connected to a magnet 34. When the supporting leg 31 is unfolded from the placing groove 23, the end of the top plate 32 at the bottom of the supporting leg 31 first abuts against the inner wall of the hole, the end of the top plate 32 is pressed to make the top plate 32 rotate to overcome the attraction of the magnet 34 and the gravity of the weight 33 to make the side wall of the top plate 32 abut against the inner wall of the hole, which can increase the contact area of the supporting leg 31 and the inner wall of the hole and further improve the stability of the fixation.

[0046] As a technical optimization scheme of the present application, the bottom end of the fixed column 22 is fixedly connected to a second connecting joint 37, and the bottom of the second connecting joint 37 is fixedly connected to a measuring instrument through a thread formed therein. The detection instrument is installed at the bottom of the second connecting joint 37 and moves downward synchronously with the telescopic joint.

[0047] In use, first, the fixed section 1 is connected with the external conveying device, that is, first, the bottom clamping block 18 of the first connecting ring 17 is clamped into the clamping groove 16, then the annular connecting block 19 is screwed into the bottom inner wall thread of the first connecting ring 17, with the rotation of the annular connecting block 19, the bottom of the annular connecting block 19 is finally screwed with the connecting thread 15, and the first connecting ring 17 and the movable section 9 are fixedly connected through the annular connecting block 19 without interfering with the connecting rod 24, the second connecting ring 20 and the hollow joint 8 are passed through the center of the driving end of the external driving device, then the top end of the connecting rod 24 is connected with the center of the driving end of the first external driving device, at this time, the second connecting ring 20 and the hollow joint 8 can be placed in turn, the bottom end of the second connecting ring 20 and the top end of the first connecting ring 17 are bolted, at this time, the top of the second connecting ring 20 is connected with the outer circle of the driving end of the second external driving device, then the hollow joint 8 is rotated, so that the bottom thread of the hollow joint 8 is connected with the top thread of the first connecting section 7, finally, the top of the hollow joint 8 is connected with the external conveying device, that is, the connection of the telescopic short section and the external device (in the field of oil drilling, generally, the ground engine, driving rotary table, kelly, drill string and other matched equipment are used as power output, and in the detection, the telescopic short section can also be driven and conveyed through these mature devices, without special arrangement of other special devices) is completed, then the detection instrument is connected with the bottom thread of the second connecting section 37, that is, the preparation work is completed.

[0048] At this time, the telescopic short section and the detection instrument are sent into the drilled hole by the external conveying device, with the telescopic short section descending along the hole pushed by the external conveying device, the detection instrument can perform depth detection, and in the detection process, the second connecting ring 20 can be driven to rotate by the second external driving device, so as to drive the first connecting ring 17, the movable section 9, the fixed column 22 and the detection instrument to rotate synchronously, in the rotation process, the annular block 10 rotates by sliding in the annular groove 12 and the limiting block 3, and is kept at the bottom of the hollow cavity 2 by the elastic force of the spring 5 and cannot be separated from the first slot 13, at this time, the detection instrument can rotate to detect the hole in 360 degrees without dead angle.

[0049] When the detection instrument needs to be fixed in position for detection or sampling at a certain depth, the first external driving device is used to push the connecting rod 24 down along the through hole 21 to make the movable block 25 descend, so that the two levers 27 push the rotating rod 35 down through the rectangular slot 36, and the tension spring 29 is stretched under stress. Since the end of the rotating rod 35 is rotationally connected with the rotating block 30, the rotating block 30 is pushed to rotate at the bottom of the rotating rod 35 during the descent of the top of the rotating rod 35, so that the two supporting legs 31 are unfolded from the placing slot 23. Finally, the end of the top plate 32 at the bottom of the supporting leg 31 first abuts against the inner wall of the hole, and the end of the top plate 32 is pressed to rotate to overcome the attraction of the magnet 34 and the gravity of the weight 33, so that the side wall of the top plate 32 abuts against the inner wall of the hole. At this time, the two supporting legs 31 can be stably fixed in the hole through the extrusion of the top plate 32 and the inner wall of the hole, and the detection instrument can be fixed in the hole. At this time, the detection instrument can be rotated for detailed detection and sampling at different positions in the hole. After sampling is completed, the first external driving device pulls the connecting rod 24 up, and the tension spring 29 returns to its original position, so that the supporting leg 31 is reset and the top plate 32 is also automatically reset under the attraction of the magnet 34.

[0050] When the hole is curved during the descent, the telescopic mechanism 11 can be retracted by rotating. First, the second connecting ring 20 is rotated to drive the movable joint 9 to rotate, so that the first slot 13 is rotated to be directly below the limiting block 3, and the second slot 14 is rotated to be directly below the guide strip 4. At this time, the second external driving device is used to pull the second connecting ring 20 to drive the first connecting ring 17, the movable joint 9, the fixed column 22 and the detection instrument to ascend along the hollow cavity 2. During the ascent, the spring 5 is compressed under stress, the second slot 14 is stably slid along the guide strip 4, and the sleeve 221 is slid along the sinking groove 6 during the ascent, so that the overall length of the telescopic section is reduced to facilitate the detection instrument to pass through the curved hole and reset after passing through.

[0051] When the hole eye curvature is large and the through contraction expansion short section is still inconvenient to pass through, the first external driving device can drive the connecting rod 24 to rotate after the contraction expansion short section, and the rotating direction is opposite to the hole eye curvature direction, that is, one of the shift rods 27 rotates and deeply enters the corresponding rectangular groove 36, and the other shift rod 27 rotates and separates from the corresponding rectangular groove 36. The limiting groove 26 cooperates with the limiting block to control the rotating angle of the movable block 25 during the rotating process. At this time, the rectangular groove 36 where the shift rod 27 deeply enters corresponds to the leg 31 opposite to the hole eye curvature direction. At this time, according to the foregoing operation, the connecting rod 24 is pushed downward, that is, the leg 31 is pushed to expand, and then the top plate 32 of the leg 31 abuts against the inner wall opposite to the hole eye curvature direction, and the other leg 31 is kept stationary under the action of the tension spring 29, that is, the expanded leg 31 can provide a supporting force to support the contraction expansion short section and the detection instrument without directly rubbing against the hole eye curvature, that is, similar to the method of lifting the heavy object by the jack to facilitate the movement direction, the through contraction expansion short section can be more conveniently passed through the curvature under the pushing of the external conveying device, and the detection equipment is not damaged.

[0052] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, if these modifications and changes of the present application fall within the scope of the claims and their equivalents, it is intended to include these modifications and changes in the protection scope of the present application.

[0053] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A telescopic sub for borehole depth sounding, comprising a fixed sub (1) and a fixed post (22), characterized in that: The fixed section (1) is internally provided with a hollow cavity (2), the inner wall of the hollow cavity (2) is fixedly connected with a limiting block (3) on one side of the bottom, the hollow cavity (2) is vertically and slidably connected with a movable section (9), a through hole (21) is formed through the center of the movable section (9), a connecting rod (24) is slidably connected in the through hole (21), the movable section (9) is fixedly connected with an annular block (10) which is slidably connected to the bottom of the hollow cavity (2), the side wall of the annular block (10) is provided with a rotary telescopic mechanism (11) comprising an annular groove (12), the bottom end of the movable section (9) is fixedly connected with a fixed column (22), the two side walls of the fixed column (22) are symmetrically provided with a placing groove (23), the bottom end of the connecting rod (24) is fixedly connected with a movable block (25), and the inside of the fixed column (22) on one side of the movable block (25) is provided with a fixing mechanism (28) comprising a supporting leg (31). The side wall of the annular block (10) is provided with an annular groove (12), the limiting block (3) is slidably connected with the annular groove (12), a first slot (13) is formed on one side of the bottom of the annular groove (12), the first slot (13) is matched with the limiting block (3), a second slot (14) is formed on the top of the annular groove (12) above the first slot (13), the top of the spring (5) is fixedly arranged on the top of the inner wall of the hollow cavity (2), and the bottom end of the spring (5) abuts against the top end of the annular block (10). The movable block (25) is fixedly connected with two symmetrical shift rods (27) on one side, two placing grooves (23) are rotatably connected with rotating blocks (30) on the top, the rotating blocks (30) are fixedly connected with supporting legs (31) on the bottom, a rotating shaft on one side of the rotating block (30) is rotatably connected with a rotating rod (35) through an extension support, a rectangular groove (36) is formed on the top of the rotating rod (35), the bottom end of a tension spring (29) is fixedly connected with the top end of the rectangular groove (36), the top end of the tension spring (29) is fixedly connected with the inside of the movable section (9), and the two shift rods (27) are movably connected with the two rectangular grooves (36) respectively.

2. A retractable sub according to claim 1, wherein: The inner wall of the hollow cavity (2) above the limiting block (3) is fixedly connected with a guide strip (4), the guide strip (4) is matched with the second slot (14), and the depth of the second slot (14) is smaller than that of the first slot (13).

3. A retractable sub according to claim 1, wherein: The top end of the fixed section (1) is fixedly connected with a first connecting section (7), the inner ring of the first connecting section (7) is threadedly connected with a hollow joint (8) through a thread, and the top of the hollow joint (8) is fixedly connected with an external conveying device.

4. A retractable sub according to claim 1, wherein: The bottom outer wall of the fixed section (1) is provided with a sunken groove (6), the top end of the fixed column (22) is fixedly connected with an annular sleeve (221), and the top of the sleeve (221) is slidably connected with the bottom of the sunken groove (6).

5. A retractable sub according to claim 1, wherein: The top of the movable section (9) is provided with a connecting thread (15), the movable section (9) around the top of the connecting thread (15) is uniformly provided with four clamping grooves (16), a clamping block (18) is slidably connected in the clamping groove (16), and the top end of the four clamping blocks (18) is fixedly connected with a first connecting ring (17).

6. A telescoping sub for use in borehole depth probing according to claim 5, characterized in that: The first connecting ring (17) is internally threaded at the bottom, and the top of an annular connecting block (19) is threadedly connected to the internally threaded bottom of the first connecting ring (17), the bottom of the annular connecting block (19) is threadedly connected with the connecting thread (15), the top of the first connecting ring (17) is fixedly connected with a second connecting ring (20) through bolts, and the top of the second connecting ring (20) is connected with an external driving device.

7. A retractable sub according to claim 1, wherein: The movable block (25) is internally threaded at the bottom of the side wall away from the lever (27), and a limiting block matched with the limiting slot (26) is fixedly connected to the bottom of the through hole (21) on one side of the limiting slot (26).

8. A retractable sub according to claim 1, wherein: The supporting leg (31) is rotatably connected with a top plate (32) at the bottom, the top plate (32) is fixedly connected with a weight (33) on the side close to the supporting leg (31), and the top plate (32) is fixedly connected with a magnet (34) on the side close to the supporting leg (31).

9. A retractable sub according to claim 1, wherein: The fixed column (22) is fixedly connected with a second connecting joint (37) at the bottom, and the second connecting joint (37) is fixedly connected with a measuring instrument through the thread.

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