A resistivity near-bit measurement device for use while drilling

Abstract

The application discloses a kind of for while drilling resistivity near bit measuring device, belong to while drilling resistivity near bit technical field, comprising: drill bit, the top end of the drill bit is equipped with connecting column, resistivity measuring mechanism is installed on the connecting column, protective mechanism is installed on the resistivity measuring mechanism, mud cleaning mechanism is installed on the protective mechanism, the for while drilling resistivity near bit measuring device is equipped with drive motor work can be carried out work by shaft, third gear set can be driven to work when third gear set works, inner tooth disc can be driven to rotate when inner tooth disc works, inner tooth disc can drive guide groove to rotate when rotating, guide groove can slide with guide seat when rotating, guide seat can slide in storage groove when moving, when scraping strip slides out storage groove inside, the outer surface of protective cover can be cleaned actively, so as to improve the accuracy of equipment measurement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of near-bit resistivity while drilling, in particular to a near-bit resistivity while drilling measuring device. BACKGROUND

[0002] In the field of oil and gas drilling engineering, real-time acquisition of formation parameters is the key to optimizing well trajectory and accurately identifying reservoirs, covering the technical category of "formation parameter measurement while drilling". The while-drilling measurement technology has become the core support means for the exploration and development of complex oil and gas reservoirs because it can simultaneously collect drilling and formation data. The resistivity parameter, as a core index for distinguishing formation lithology and judging fluid properties, directly affects the efficiency of reservoir evaluation in terms of measurement accuracy and response speed. Near-bit resistivity while drilling measurement utilizes electromagnetic induction principle, installs specific transmitting and receiving coils near the drill pipe or drill bit, transmits alternating electromagnetic field to the formation, and measures the induced current or voltage returned by the formation, thereby calculating the resistivity of the formation. At the same time, near-bit resistivity while drilling measurement can be performed in real time during drilling to provide dynamic information of formation resistivity.

[0003] The authorized announcement No. CN119062331B discloses a near-bit resistivity while drilling measuring device, which relates to the technical field of near-bit resistivity while drilling, specifically a near-bit resistivity while drilling measuring device, comprising a drill bit and a base body arranged at one end of the drill bit. The base body is arrayed with placement grooves. The base body is internally arrayed with measurement components for real-time detection of the geological environment. The base body is arrayed with protective components for protection during measurement. The invention can rotate the entire protective ball during measurement to avoid frequent contact between one side of the protective shell and the geology, thereby significantly reducing the service life of the entire protective shell. In addition, the protective shell can retract the measurement element into the base body when it encounters strong pressure during protection, thereby protecting the measurement element. However, the protective shell only retracts into the base body for cleaning when it is subjected to strong pressure. However, the outer surface of the protective shell will stick to mud during while-drilling measurement. When the mud thickness on the surface of the protective shell is high, it will affect the measurement accuracy of the resistivity. In addition, mud will enter the base body when the protective shell enters the base body, which can easily contaminate the internal components of the base body and reduce the service life of the equipment. SUMMARY

[0004] The present application aims to provide a near-bit resistivity while drilling measuring device that can improve the measurement accuracy of the equipment by moving the guide seat to push the scraping strip to slide in the storage groove and actively clean the outer surface of the protective cover when the scraping strip slides out of the storage groove.

[0005] To achieve the above object, the present application provides the following technical scheme: a near-bit resistivity measurement device for drilling, comprising: a drill bit, a connecting column is installed at the top end of the drill bit, a resistivity measurement mechanism is installed on the connecting column, a protection mechanism is installed on the resistivity measurement mechanism, a mud cleaning mechanism is installed on the protection mechanism, the protection mechanism comprises: a telescopic assembly, a rotating assembly and a crushing assembly;

[0006] The telescopic assembly comprises a mounting cylinder, a rotating seat, a protective cover and a connecting cylinder, at least three mounting cylinders are installed in an annular array on the outer surface of the connecting column, the rotating seat is movably connected inside the mounting cylinder, the arc surface of the rotating seat is rotatably installed with the protective cover, the top end of the protective cover is fixedly installed with the connecting cylinder, the protective cover can move horizontally in the mounting cylinder when the outer surface of the protective cover is extruded by the stone, and the protective cover can push the rotating seat to move horizontally in the mounting cylinder when the protective cover moves horizontally;

[0007] The rotating assembly comprises a telescopic rod and a second gear set, the fixed part of the telescopic rod is rotatably installed on the mounting cylinder through a bearing seat, the telescopic part of the telescopic rod is connected with the connecting cylinder through a bearing seat, the output end of the telescopic rod is connected with the connecting cylinder through the second gear set, the telescopic rod can drive the second gear set to rotate when the telescopic rod rotates, the connecting cylinder and the protective cover can be driven to rotate by the second gear set, and the protective cover can unload the extrusion force of the stone when the protective cover rotates;

[0008] The crushing assembly comprises a mounting seat and a crushing head, a plurality of mounting seats are fixedly installed in an annular array on the outer surface of the connecting column close to the mounting cylinder and the protective cover, the mounting seat is internally provided with an arc-shaped groove for installing the second gear set and the connecting cylinder, the bottom of the mounting seat is provided with an arc surface abutting against the protective cover, at least three crushing heads are fixedly installed at equal distances on the side of the mounting seat close to the protective cover, and the crushing head can crush the stone extruding the protective cover.

[0009] Preferably, the resistivity measurement mechanism comprises a measurement module, a connecting pipe, a corrugated pipe and a main pipe, the measurement module is internally provided in the protective cover, the connecting pipe is installed on the top of the measurement module, one end of the connecting pipe extends out of the connecting cylinder, the connecting pipe is connected with the connecting cylinder through a bearing, the corrugated pipe is installed on the connecting pipe, the main pipe is fixedly installed on the other end of the connecting pipe, and the connecting pipe and the main pipe are connected with the connecting line of the related equipment.

[0010] Preferably, the telescopic assembly comprises a telescopic spring, a guide ring and a moving groove, the telescopic spring is connected between the inner wall of the mounting cylinder and the end of the rotating seat, the telescopic spring can make the protective cover have an automatic reset function through its own characteristics, the guide ring is fixedly installed on the outer surface of the connecting cylinder, and the moving groove for the sliding of the connecting cylinder and the guide ring is formed in the end of the mounting cylinder.

[0011] Preferably, the rotating assembly further comprises a driving motor, a rotating shaft and a first gear set, the driving motor is fixedly installed at the center of the bottom of the connecting column, the output end of the driving motor is fixedly installed with the rotating shaft, and the top end of the rotating shaft is connected with the end of the telescopic rod fixed part through the first gear set.

[0012] Preferably, the mud cleaning mechanism comprises a pushing assembly and a flow guide assembly.

[0013] The pushing assembly comprises a storage groove, a scraping strip and a guide seat, the bottom of the mounting cylinder is provided with the storage groove, the scraping strip is movably connected inside the storage groove, the scraping strip is made of magnetic flexible material, the scraping strip and the mounting seat are magnetically connected, the bottom of the scraping strip is fixedly installed with the guide seat, and the upper part of the guide seat can move horizontally in the storage groove.

[0014] Preferably, the pushing assembly further comprises an inner tooth disc, a guide groove and a third gear set, the inner tooth disc is rotatably installed on the inner side of the connecting column through the annular groove, the upper surface of the inner tooth disc is provided with the guide groove, the guide groove is slidably connected with the guide seat, and the inner tooth disc and the rotating shaft are connected through the third gear set.

[0015] Preferably, the flow guide assembly comprises a flow guide groove, a leakage port, a discharge groove and a cleaning rod, the side surface of the scraping strip is provided with the flow guide groove, the bottom of the scraping strip close to the flow guide groove is provided with the leakage port, the inner part of the connecting column and the mounting cylinder close to the leakage port is provided with the discharge groove, the tail end of the discharge groove faces the inner part of the connecting column, and the cleaning rod is fixedly installed on the inner wall of the storage groove close to the flow guide groove.

[0016] Compared with the prior art, the device for resistivity measurement near the drill bit while drilling has the beneficial effects that:

[0017] 1. When the driving motor works, the rotating shaft can drive the third gear set to work, the third gear set can drive the inner tooth disc to rotate when working, the inner tooth disc can drive the guide groove to rotate when rotating, the guide groove can slide with the guide seat when rotating, the guide seat can push the scraping strip to slide in the storage groove when moving, and the scraping strip can actively clean the outer surface of the protective cover when sliding out of the inside of the storage groove, so that the measurement accuracy of the equipment can be improved.

[0018] 2. The end of the scraping strip is magnetically attracted to the mounting seat, and when the protective cover rotates, the guide groove can scrape off the mud on the outer surface of the protective cover. After the mud is scraped off, it will flow into the inside of the leakage hole and be transported to the inside of the discharge groove through the leakage hole. The mud enters the discharge groove and is transported to the inside of the drill bit. The mud can be pumped out after entering the inside of the drill bit. The cleaning rod can clean the gravel residues in the guide groove when the scraping strip is recycled to the storage groove, thereby avoiding blockage of the leakage hole and the discharge groove, and facilitating improvement of the cleaning effect of the protective cover;

[0019] 3. The protruding stones in the soil layer when the connecting column rotates with the drill bit will extrude the protective cover. When the protective cover rotates out of the stone position, the connecting column will drive the mounting seat and the crushing head to rotate to the stone position. At this time, the crushing head will crush the stone, which can avoid abrasion to the rest of the protective cover, thereby improving the service life of the protective cover;

[0020] 4. When the protective cover is extruded by the stone, the protective cover moves horizontally in the mounting cylinder. The protective cover can extrude the arc surface of the rotating seat when it moves horizontally. The rotating seat can move horizontally in the mounting cylinder when it is extruded. The protective cover can drive the connecting cylinder to move horizontally when it moves horizontally, which can ensure the cleanliness of the connecting column and improve the service life of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a perspective view of the present application;

[0022] Figure 2 is a front view of the structure of the present application;

[0023] Figure 3 is a perspective view of the connecting column of the present application;

[0024] Figure 4 is a perspective view of the connecting column of the present application;

[0025] Figure 5 is a partial enlarged perspective view of the protective mechanism of the present application;

[0026] Figure 6 is a partial enlarged perspective view of the protective mechanism of the present application;

[0027] Figure 7 is a partial enlarged perspective view of the protective mechanism of the present application;

[0028] Figure 8 is a partial enlarged perspective view of the mud cleaning mechanism of the present application.

[0029] In the figure: 100, drill bit; In the figure: 100, drill bit;

[0030] 200, connecting column;

[0031] 300, resistivity measuring mechanism;

[0032] 310, measuring module; 320, connecting pipe; 330, bellows; 340, main pipe;

[0033] 400, protection mechanism;

[0034] 410, telescopic assembly; 411, mounting cylinder; 412, telescopic spring; 413, rotating seat; 414, protective cover; 415, connecting cylinder; 416, guide ring; 417, moving groove;

[0035] 420, rotating assembly; 421, driving motor; 422, rotating shaft; 423, telescopic rod; 424, first gear set; 425, second gear set;

[0036] 430, crushing assembly; 431, mounting seat; 432, crushing head;

[0037] 500, mud cleaning mechanism;

[0038] 510, pushing assembly; 511, storage groove; 512, scraping strip; 513, guide seat; 514, inner tooth disc; 515, guide groove; 516, third gear set;

[0039] 520, flow guiding assembly; 521, flow guiding groove; 522, leakage opening; 523, discharge groove; 524, cleaning rod. DETAILED DESCRIPTION

[0040] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative work should fall within the protection scope of the present application.

[0041] In addition, the terms “mounting”, “setting”, “provided with”, “connecting”, “connected”, “sleeved” should be understood broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication between two devices, elements or components. For persons skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0042] Please refer to Figures 1-4The application provides an embodiment: a near-bit resistivity measurement device for drilling, comprising a drill bit 100, a connecting column 200 is arranged on the top end of the drill bit 100, a resistivity measurement mechanism 300 is arranged on the connecting column 200, a protection mechanism 400 is arranged on the resistivity measurement mechanism 300, and a mud cleaning mechanism 500 is arranged on the protection mechanism 400; the protection mechanism 400 comprises a telescopic assembly 410, a rotating assembly 420 and a crushing assembly 430.

[0043] It should be noted that the drill bit 100 can drive the connecting column 200 to rotate when working, the connecting column 200 can drive the resistivity measurement mechanism 300 to measure the resistivity of the soil layer when rotating, the telescopic assembly 410 and the rotating assembly 420 on the protection mechanism 400 can protect the resistivity measurement mechanism 300 when the resistivity measurement mechanism 300 measures the resistivity of the soil layer, so as to avoid that the stones in the soil layer damage the resistivity measurement mechanism 300, and the crushing assembly 430 can crush the protruding stones in the soil layer, the surface of the telescopic assembly 410 can adhere to the mud when moving while drilling, so as to affect the measurement accuracy of the resistivity measurement mechanism 300 when working, and the protection mechanism 400 can clean the mud.

[0044] As shown in Figure 1 , Figures 3-7 , the resistivity measurement mechanism 300 comprises a measurement module 310, a connecting pipe 320, a bellows pipe 330 and a main pipe 340, the measurement module 310 is arranged in the protection cover 414, the connecting pipe 320 is arranged on the top of the measurement module 310, one end of the connecting pipe 320 extends out of the connecting cylinder 415, the connecting pipe 320 is connected with the connecting cylinder 415 through a bearing, the bellows pipe 330 is arranged on the connecting pipe 320, the main pipe 340 is fixedly arranged on the other end of the connecting pipe 320, and the connecting pipe 320 and the main pipe 340 are connected with the connecting line of the related equipment;

[0045] It is conceived that the measurement module 310 can measure the resistivity of the soil layer through the protection cover 414, and the resistivity measurement data can be transmitted to the related equipment at a remote place through the connecting line in the connecting pipe 320 and the main pipe 340;

[0046] When the protection cover 414 is extruded by the stones, the protection cover 414 drives the connecting cylinder 415 to move horizontally, the connecting cylinder 415 can drive the connecting pipe 320 and the measurement module 310 to move horizontally through the bearing when moving horizontally, and the connecting pipe 320 can be telescoped through the bellows pipe 330 when moving horizontally.

[0047] As shown in Figures 1-7As shown, the telescopic assembly 410 includes a mounting cylinder 411, a rotating seat 413, a protective cover 414, and a connecting cylinder 415. At least three mounting cylinders 411 are installed through the outer surface of the connecting column 200 in a ring array. The rotating seat 413 is movably connected inside the mounting cylinder 411. The protective cover 414 is rotatably mounted on the arc-shaped surface of the rotating seat 413. The connecting cylinder 415 is fixedly installed at the top of the protective cover 414. When the outer surface of the protective cover 414 is squeezed by a stone, it can move horizontally within the mounting cylinder 411. When the protective cover 414 moves horizontally, it can push the rotating seat 413 to move horizontally within the mounting cylinder 411.

[0048] It is worth noting that when the protective cover 414 is squeezed by a stone, the protective cover 414 will move horizontally within the mounting cylinder 411. When the protective cover 414 moves horizontally, it can squeeze the arc-shaped surface of the rotating seat 413. When the rotating seat 413 is squeezed, it can move horizontally within the mounting cylinder 411. When the protective cover 414 moves horizontally, it can drive the connecting cylinder 415 to move horizontally.

[0049] like Figures 3-7 As shown, the telescopic assembly 410 includes a telescopic spring 412, a guide ring 416, and a moving groove 417. The telescopic spring 412 is connected between the inner wall of the mounting cylinder 411 and the end of the rotating seat 413. The telescopic spring 412 can enable the protective cover 414 to have an automatic reset function through its own characteristics. The guide ring 416 is fixedly installed on the outer surface of the connecting cylinder 415. The end of the mounting cylinder 411 is provided with a moving groove 417 for sliding between the connecting cylinder 415 and the guide ring 416.

[0050] It is clear that when the rotating seat 413 moves horizontally within the mounting cylinder 411, it can compress the telescopic spring 412. When the protective cover 414 separates from the stone, the telescopic spring 412 can reset the rotating seat 413 and the protective cover 414 through its own elasticity.

[0051] When the protective cover 414 is compressed and moves horizontally, it can drive the connecting cylinder 415 to move horizontally. When the connecting cylinder 415 moves horizontally, it can drive the guide ring 416 to move. When the connecting cylinder 415 and the guide ring 416 move horizontally, they can move horizontally within the moving groove 417. The moving groove 417 can guide the connecting cylinder 415 and the guide ring 416. While the connecting cylinder 415 moves horizontally, it can drive the telescopic rod 423 to extend and retract through the bearing seat.

[0052] like Figures 1-7As shown, the rotating assembly 420 further includes a driving motor 421, a rotating shaft 422, and a first gear set 424. The driving motor 421 is fixedly installed at the center of the inner bottom of the connecting column 200. The output end of the driving motor 421 is fixedly installed with the rotating shaft 422. The top end of the rotating shaft 422 is connected with the end of the fixed part of the telescopic rod 423 through the first gear set 424. The first gear set 424 can be two bevel gears matched with each other.

[0053] It should be noted that the driving motor 421 can drive the rotating shaft 422 to rotate when working. The rotating shaft 422 can drive the first gear set 424 to rotate when rotating. The first gear set 424 can drive the telescopic rod 423 to rotate when working.

[0054] As shown in Figures 3-7 The rotating assembly 420 includes a telescopic rod 423 and a second gear set 425. The fixed part of the telescopic rod 423 is rotatably installed on the mounting cylinder 411 through a bearing seat. The telescopic part of the telescopic rod 423 is connected with the connecting cylinder 415 through a bearing seat. The output end of the telescopic rod 423 is connected with the connecting cylinder 415 through the second gear set 425. The second gear set 425 can be two bevel gears matched with each other. The telescopic rod 423 can drive the second gear set 425 to rotate when rotating. The second gear set 425 can drive the connecting cylinder 415 and the protective cover 414 to rotate. The protective cover 414 can unload the extrusion force of the stone when rotating.

[0055] It should be noted that the telescopic rod 423 can drive the second gear set 425 to work when rotating. The second gear set 425 can drive the connecting cylinder 415 to rotate when working. The connecting cylinder 415 can drive the guide ring 416 to rotate in the moving groove 417 when rotating. The connecting cylinder 415 can rotate with the cooperation of the bearing and the connecting pipe 320. The connecting cylinder 415 can drive the protective cover 414 to rotate at the same time. The protective cover 414 can rotate in the arc surface of the rotating seat 413 and the mounting seat 431 when rotating. The protective cover 414 can unload the extrusion of the stone when rotating.

[0056] As shown in Figures 1-7 The crushing assembly 430 includes a mounting seat 431 and a crushing head 432. The connecting column 200 is fixedly installed with a plurality of mounting seats 431 in an annular array close to the outer surface of the mounting cylinder 411 and the protective cover 414. The mounting seat 431 is internally provided with an arc-shaped groove for installing the second gear set 425 and the connecting cylinder 415. The bottom of the mounting seat 431 is provided with an arc-shaped surface abutting against the protective cover 414. At least three crushing heads 432 are fixedly installed on the side of the mounting seat 431 close to the protective cover 414 at equal distances. The crushing head 432 can crush the stone extruded by the protective cover 414.

[0057] It is conceived that when the connecting column 200 rotates with the drill bit 100, the protruding stone in the soil layer can press the protective cover 414, when the protective cover 414 rotates out of the position of the stone, the connecting column 200 can drive the mounting seat 431 and the crushing head 432 to rotate to the position of the stone, at this time, the crushing head 432 can crush the stone, and after the stone is crushed, the abrasion to the remaining protective cover 414 can be avoided.

[0058] As shown in Figures 1-8 The pushing assembly 510 further comprises an inner toothed disc 514, a guide groove 515 and a third gear set 516. The inner toothed disc 514 is rotatably installed in the connecting column 200 through an annular groove. The upper surface of the inner toothed disc 514 is provided with the guide groove 515. The guide groove 515 is provided with an inner arc-shaped groove and an outer arc-shaped groove. The diameter of the inner arc-shaped groove is smaller than that of the outer arc-shaped groove. The inner arc-shaped groove and the outer arc-shaped groove are connected through an inclined groove. The guide groove 515 is slidably connected with the guide seat 513. The inner toothed disc 514 is connected with the rotating shaft 422 through the third gear set 516. The third gear set 516 can be two gears matched with each other. One of the gears is matched with the inner toothed disc 514. The gear between the rotating shaft 422 and the inner toothed disc 514 is fixed on the inner wall of the connecting column 200 through a mounting bracket.

[0059] It is understood that when the driving motor 421 works, the rotating shaft 422 can be driven to rotate. When the rotating shaft 422 rotates, the third gear set 516 can be driven to work. When the third gear set 516 works, the inner toothed disc 514 can be driven to rotate. When the inner toothed disc 514 rotates, it can rotate in the annular groove of the connecting column 200. When the inner toothed disc 514 rotates, the guide groove 515 can be driven to rotate. When the guide groove 515 rotates, it can slide with the guide seat 513. When the guide seat 513 is located in the inner arc-shaped groove of the guide groove 515, the scraping strip 512 is in the storage groove 511. When the guide seat 513 is located in the inclined groove of the guide groove 515, the inclined groove can push the guide seat 513 to the inner arc-shaped groove. When the guide seat 513 moves, the scraping strip 512 can be moved out of the storage groove 511 to clean the protective cover 414. When the guide seat 513 is located in the other inclined groove of the guide groove 515, the inclined groove can push the guide seat 513 to the inner arc-shaped groove for storage.

[0060] As shown in Figures 1-8As shown, the mud cleaning mechanism 500 comprises a pushing assembly 510 and a guide assembly 520, the pushing assembly 510 comprises a storage groove 511, a scraping strip 512 and a guide seat 513, the bottom of the mounting cylinder 411 is provided with the storage groove 511, the scraping strip 512 is movably connected inside the storage groove 511, the scraping strip 512 is made of magnetic flexible material, the scraping strip 512 is magnetically connected with the mounting seat 431, the bottom of the scraping strip 512 is fixedly provided with the guide seat 513, and the upper portion of the guide seat 513 can move horizontally in the storage groove 511.

[0061] It is worth noting that the guide groove 515 can push the guide seat 513 to move horizontally when rotating, the guide seat 513 can push the scraping strip 512 to move when moving horizontally, the scraping strip 512 can slide in the storage groove 511 when moving, the scraping strip 512 can be bent by its material when part of the scraping strip 512 slides out of the storage groove 511, the end of the scraping strip 512 after bending can contact the mounting seat 431, and the scraping strip 512 can be attached to the outer surface of the protective cover 414 after contacting the mounting seat 431.

[0062] As shown in the figure, Figures 1-8 The guide assembly 520 comprises a guide groove 521, a leakage hole 522, a discharge groove 523 and a cleaning rod 524, the side of the scraping strip 512 is provided with the guide groove 521, the bottom of the scraping strip 512 close to the guide groove 521 is provided with the leakage hole 522, the inside of the connecting column 200 and the mounting cylinder 411 close to the leakage hole 522 is provided with the discharge groove 523, the end of the discharge groove 523 faces the inside of the connecting column 200, and the inner wall of the storage groove 511 close to the guide groove 521 is fixedly provided with the cleaning rod 524.

[0063] It is conceivable that when the end of the scraping strip 512 is magnetically attracted to the mounting seat 431, the guide groove 521 can scrape off the mud on the outer surface of the protective cover 414 when the protective cover 414 rotates, the mud can flow into the inside of the leakage hole 522 after being scraped off, and the mud can be transported into the inside of the discharge groove 523 through the leakage hole 522, the mud can be transported into the inside of the drill bit 100 after entering the discharge groove 523, the mud can be discharged by the water pump after entering the inside of the drill bit 100, and the cleaning rod 524 can clean the gravel residues in the guide groove 521 when the scraping strip 512 is recycled to the storage groove 511, so as to avoid the leakage hole 522 and the discharge groove 523 from being blocked.

[0064] 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 resistivity near-bit measurement device for use while drilling, comprising: The utility model discloses a drill bit, the top of drill bit is installed with connecting column, the connecting column is installed with resistivity measuring mechanism, the resistivity measuring mechanism is installed with protection mechanism, the protection mechanism is installed with mud cleaning mechanism, and its characterized in that, the protection mechanism includes; telescopic component, rotating component and broken component, The telescopic component includes installation cylinder, rotating seat, protective cover and connecting cylinder, the outer surface of connecting column is installed with at least three installation cylinders in the form of annular array, the inside of installation cylinder is movably connected with rotating seat, the arc surface of rotating seat is rotatably installed with protective cover, the top of protective cover is fixedly installed with connecting cylinder, the outer surface of protective cover can move horizontally in installation cylinder when being extruded by stone, and the protective cover can push rotating seat to move horizontally in installation cylinder when moving horizontally. The rotating component includes telescopic rod and second gear set, the fixed part of telescopic rod is rotatably installed on installation cylinder through bearing seat, the telescopic part of telescopic rod is connected with connecting cylinder through bearing seat, and the output end of telescopic rod is connected with connecting cylinder through second gear set, the telescopic rod can drive second gear set to rotate when rotating, the second gear set can drive connecting cylinder and protective cover to rotate when rotating, and the protective cover can unload the extrusion force of stone when rotating. The broken component includes mounting seat and broken head, a plurality of mounting seats are fixedly installed on the outer surface of connecting column close to installation cylinder and protective cover in the form of annular array, the inside of mounting seat is provided with arc-shaped groove for installing second gear set and connecting cylinder, the bottom of mounting seat is provided with arc surface that is attached to protective cover, at least three broken heads are fixedly installed on the side of mounting seat close to protective cover at equal distance, and the broken head can break the stone extruding protective cover.

2. The resistivity near-bit measurement-while-drilling apparatus of claim 1, wherein: The resistivity measuring mechanism includes measuring module, connecting pipe, bellows and main pipe, the inside of protective cover is provided with measuring module, the top of measuring module is installed with connecting pipe, one end of connecting pipe extends out of connecting cylinder, and connecting pipe is connected with connecting cylinder through bearing, the connecting pipe is installed with bellows, the other end of connecting pipe is fixedly installed with main pipe, and connecting pipe and main pipe are installed with connecting line of relevant equipment.

3. The resistivity near-bit measurement-while-drilling apparatus of claim 1, wherein: The telescopic component includes telescopic spring, guide ring and moving groove, the end of rotating seat is connected with telescopic spring between the inner wall of installation cylinder and rotating seat, the telescopic spring can make protective cover have automatic reset function through its own characteristics, the outer surface of connecting cylinder is fixedly installed with guide ring, and the end of installation cylinder is provided with moving groove for the sliding of connecting cylinder and guide ring.

4. The resistivity near-bit measurement-while-drilling apparatus of claim 1, wherein: The rotating component further includes driving motor, rotating shaft and first gear set, the center of bottom of connecting column is fixedly installed with driving motor, the output end of driving motor is fixedly installed with rotating shaft, and the end of fixed part of telescopic rod is connected with rotating shaft through first gear set.

5. The resistivity near-bit measurement-while-drilling apparatus of claim 1, wherein: The mud cleaning mechanism includes pushing component and flow guide component, The push assembly comprises a storage groove, a scraping strip and a guide seat, the bottom of the mounting cylinder is provided with the storage groove, the scraping strip is movably connected inside the storage groove, the scraping strip is made of magnetic flexible material, the scraping strip and the mounting seat are magnetically connected, the bottom of the scraping strip is fixedly provided with the guide seat, and the upper portion of the guide seat can move horizontally in the storage groove.

6. A resistivity near-bit measurement-while-drilling apparatus as defined in claim 5, wherein: The push assembly further comprises an inner tooth disc, a guide groove and a third gear set, the inner tooth disc is rotatably installed inside the connecting column through an annular groove, the upper surface of the inner tooth disc is provided with the guide groove, the guide groove is slidably connected with the guide seat, and the inner tooth disc and the rotating shaft are connected through the third gear set.

7. A resistivity near-bit measurement-while-drilling apparatus as defined in claim 6, wherein: The flow guide assembly comprises a flow guide groove, a leakage opening, a discharge groove and a cleaning rod, the side surface of the scraping strip is provided with the flow guide groove, the bottom of the scraping strip close to the flow guide groove is provided with the leakage opening, the inside of the connecting column and the mounting cylinder close to the leakage opening is provided with the discharge groove in a penetrating manner, the tail end of the discharge groove faces the inside of the connecting column, and the inside wall of the storage groove close to the flow guide groove is fixedly provided with the cleaning rod.

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