Resistivity measuring short section and well drilling device

Abstract

The invention discloses a resistivity measurement short section, and relates to the technical field of drilling equipment, the resistivity measurement short section mainly comprises a short section body and a plurality of coil pieces, the coil pieces can sleeve the short section body and generate deformation, the short section body is provided with an electronic element, each coil piece is provided with a coil, and the coils can be in electric signal connection with the electronic element. And the coil can have different inclination angles by deviating the coil piece by different angles. The invention further discloses a well drilling device which comprises the resistivity measuring short section. The inclination angle of the coil can be changed easily, and conversion between azimuth resistivity measurement and conventional resistivity measurement is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, in particular to a resistivity measuring nipple and a drilling device. Background Art

[0002] Traditional resistivity while drilling instruments are installed on the top of the drill pipe to measure the resistivity of the formation. From actual implementation, it can be found that this method is far away from the drill bit, which will cause the measurement information to lag. When the oil and gas layer is found, the drill bit has often moved a long distance. At this time, the oil and gas layer has been contaminated by mud.

[0003] At present, there is also a while-drilling resistivity instrument installed in a short section. Compared with the upper part of the drill pipe, the short section is closer to the drill bit, which can be used to solve the problem that the while-drilling logging tool is far away from the drill bit and the measurement information is delayed. However, the current short section generally includes multiple installation slots, and the resistivity measurement coil is placed in the installation slot. For conventional resistivity measurement, the coil can be kept horizontal (i.e., perpendicular to the axis of the borehole). For azimuthal resistivity measurement, the coil is no longer perpendicular to the axis of the borehole, that is, it is tilted at a certain angle relative to the horizontal direction mentioned above. Once the coil is wound in the installation slot, the coil cannot change its angle. When the angle needs to be changed, the coil can only be untied and then rewound. The angle change is very difficult. The angle change of the coil of the conventional short section is difficult, which affects the conversion measurement efficiency of conventional resistivity and azimuthal resistivity. Therefore, there is an urgent need for a resistivity measurement short section and a drilling device to solve the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a resistivity measurement sub and a drilling device to solve the problems existing in the above-mentioned prior art, so that the inclination angle of the coil can be easily changed, thereby facilitating the conversion between azimuthal resistivity measurement and conventional resistivity measurement.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a resistivity measurement pup joint, comprising a pup joint body and a plurality of coil parts, wherein the coil parts can be sleeved on the pup joint body and deformed, and an electronic component is arranged on the pup joint body, each of the coil parts is arranged with a coil, and the coil can be connected with the electronic component by electrical signals, and the coil parts can have different inclination angles by offsetting different angles.

[0007] In some embodiments, it also includes a shell and a mounting groove, wherein the mounting groove is arranged on the outside of the short section body, and the electronic component is arranged in the mounting groove. The shell is used to be sleeved on the outside of the short section body, and an installation space can be formed between the inner wall of the shell and the outside of the short section body, and the installation space is used to accommodate the coil component.

[0008] In some embodiments, it also includes a plurality of support rods, which are arranged in the installation space along the length direction of the short section body. The connection between two adjacent coil parts and the connection between the coil part close to the short section body and the short section body are both connected through the support rods. Changing the length of the support rod between the coil part and the short section body can change the circumferential distance of the coil part from the end of the short section body; changing the length of the support rod between the coil part close to the short section body and the coil part adjacent to the coil part close to the short section body can change the offset angle of the coil part adjacent to the coil part close to the short section body.

[0009] In some embodiments, an anti-drop cap is also included, which includes a cap end and a rod end, the shell includes a covering portion and a connecting portion, the covering portion is used to cover the outside of the short section body, the connecting portion is vertically arranged to the covering portion and extends toward the inside of the short section body, the cap end is fixedly connected to the rod end, and the rod end can pass through the connecting portion and be fixedly connected to the short section body, and the cap end can contact the end of the connecting portion away from the support rod.

[0010] In some embodiments, a first sealing ring and a second sealing ring are further included, wherein the first sealing ring is fixedly disposed on the inner wall of the through hole of the connecting portion for the rod end to pass through, and the second sealing ring is fixedly disposed on an end of the connecting portion away from the supporting rod.

[0011] In some embodiments, it also includes an anti-drop clamp and a resistance member arranged in the cavity of the short section body, the anti-drop cap is connected to the short section body by threads, the anti-drop clamp is axially sliding and circumferentially fixed in the cavity of the short section body, the first end of the anti-drop clamp is provided with a key block, the anti-drop cap is provided with a key slot at one end close to the short section body, the two ends of the resistance member are respectively connected to the short section body and the second end of the anti-drop clamp, and under the resistance of the resistance member, the key block can be stuck in the key slot.

[0012] In some embodiments, the resisting member is a disc spring, and the disc spring is always in a compressed state.

[0013] In some embodiments, a first joint is further included, wherein the first joint is fixedly connected to the connecting portion and is used to connect a drill pipe.

[0014] In some embodiments, a medium injection hole is provided on the covering portion, the medium injection hole can be used to allow the medium to enter the installation space, and the medium injection hole can be blocked by a plug;

[0015] Wherein, the plug includes a screw plug and a sealing ring, a threaded hole is provided on the covering portion, and the screw plug can pass through the sealing ring and be threadedly connected to the threaded hole.

[0016] The present invention also provides a drilling device, comprising the resistivity measurement sub as described above.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The resistivity measurement pup provided by the present invention has a coil part that can be sleeved on the pup body, and each coil part is provided with a coil, the coil can be connected to an electronic component electrical signal, and the coil part can have different inclination angles by offsetting at different angles. The coil is provided on the coil part, and when the inclination angle of the coil needs to be changed, the coil part can be connected to different heights of the pup body, so that the inclination angle of the coil can also be changed, which is convenient for the conversion between azimuthal resistivity measurement and conventional resistivity measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the structure of the resistivity measurement short section in some embodiments of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the anti-drop cap in some embodiments of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the anti-drop cap installation tool in some embodiments of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the anti-drop clamp in some embodiments of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the anti-drop clamp installation tool in some embodiments of the present invention.

[0025] In the figure: 1-short section body; 2-shell; 21-covering part; 22-connecting part; 3-anti-drop cap; 31-cap end; 32-rod end; 33-keyway; 4-first joint; 5-second sealing ring; 6-first sealing ring; 7-support rod; 71-first support column; 72-second support column; 73-third support column; 74-fourth support column; 8-coil member; 81-first coil member; 82-second coil member; 83-third coil member; 9-electronic component; 10-plug; 11-anti-drop clamp; 111-key block; 12-disc spring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The object of the present invention is to provide a resistivity measurement sub and a drilling device to solve the problems existing in the above-mentioned prior art, so that the inclination angle of the coil can be easily changed, thereby facilitating the conversion between azimuthal resistivity measurement and conventional resistivity measurement.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Embodiment 1

[0030] like Figure 1-Figure 5 As shown, the present invention provides a resistivity measurement pup joint, including a pup joint body 1 and a plurality of coil parts 8, the coil parts 8 can be sleeved on the pup joint body 1 and deformed, and the pup joint body 1 is provided with an electronic component 9, each coil part 8 is provided with a coil, the coil can be connected to the electronic component 9 by electrical signals, and the coil part 8 can have different inclination angles by offsetting different angles. The specific coil can be wound on the coil part 8, when the inclination angle of the coil needs to be changed, the different ends of the coil part 8 can be connected to different heights of the pup joint body 1, so that the coil part 8 is offset and deformed, and then the inclination angle of the coil can also be changed, which is convenient for the conversion between azimuthal resistivity measurement and conventional resistivity measurement. When the coil is tilted, the azimuthal resistivity measurement can be realized, and when the radial direction of the coil is the same as the radial direction of the borehole, that is, when the coil is horizontal, the conventional resistivity measurement can be realized. It should be noted that the coil can also be arranged on the inner wall of the coil part 8.

[0031] In some embodiments, the resistivity measurement pup joint further includes a shell 2 and a mounting groove, the outer side of the pup joint body 1 is provided with a mounting groove, the mounting groove is used to accommodate the electronic component 9, the shell 2 is used to be sleeved on the outer side of the pup joint body 1, and the space between the inner wall of the shell 2 and the outer side of the pup joint body 1 can form an installation space, and the shell 2 and the pup joint body 1 are connected by a slot, the coil 8 is arranged in the installation space, and can be sleeved on the pup joint body 1. The shell 2 can protect the pup joint body 1 and the electronic component 9 arranged in the mounting groove to a certain extent, and the use is safer and longer.

[0032] It should be noted that the coil member 8 can be a rubber ring, a silicone ring, a rubber cylinder with a small height, etc., as long as it is relatively easy to deform, has a certain elasticity, and has good insulation performance. The coil winding method is to wrap around the circumference of the entire coil member 8 and around the outside of the coil member 8.

[0033] In some embodiments, the resistivity measurement pup joint further comprises a plurality of support rods 7, which are arranged in the installation space along the length direction of the pup joint body 1, and two adjacent coils 8 are connected by the support rods 7. By changing the length of the support rods 7 between the coils 8 and the pup joint body 1, the circumferential distance of the coils 8 from the end of the pup joint body 1 can be changed; by changing the length of the support rods 7 between the coils close to the pup joint body 1 and the coils close to the pup joint body 1, the offset angle of the coils close to the coils close to the pup joint body 1 can be changed. A plurality of support rods 7 are arranged in the installation space along the length direction of the pup joint body 1, and the adjacent coils 8 are connected by the support rods 7. The coils 8 close to the pup joint body 1 are also connected to the pup joint body 1 by the support rods 7. The support rods 7 can provide stable support for the coils 8, so that they maintain a fixed position and state in the installation space, and avoid displacement or shaking of the coils 8 during the measurement process, thereby ensuring the position accuracy of the coils and the accuracy of the measurement, and by changing the length of each support rod 7, the tilt offset angle of the corresponding coils 8 can be changed.

[0034] It should be noted that if Figure 1As shown, the number of coil members is three, the number of support rods is four, namely the first support column 71, the second support column 72, the third support column 73 and the fourth support column 74, the first support column 71 and the second support column 72 are connected by the first coil member 81, the second support column 72 and the third support column 73 are connected by the second coil member 82, and the third support column 73 and the fourth support column 74 are connected by the third coil member 83. When the inclination angle of the coil needs to be changed, the first coil member 81 can be firstly sleeved on the short section body 1, and then the first support column 71 of a suitable length can be selected according to the required coil angle, and the first support column 81 can be 71 is connected with the first coil member 81, and then the second coil member 82 is sleeved on the short section body 1, and the second support column 72 of appropriate length is selected according to the required coil angle, and the second support column 72 is connected with the first coil member 81 and the second coil member 82, and then after the third coil member 83 is installed, the third support column 73 and the fourth support column 74 of appropriate length are selected according to the required coil angle, and the third support column 73 is connected with the second coil member 82 and the third coil member 83, and the fourth support column 74 is connected with the third coil member 83 and the connecting portion 22, and finally the coil circuit on each coil member is connected with the circuit of the electronic component 9. The electronic component 9 here can be a circuit board. By changing the length of each first support column 71, the second support column 72, the third support column 73 and the fourth support column 74, the coil member 8 can be in a stable tilted state.

[0035] In some embodiments, the resistivity measurement short section also includes an anti-drop cap 3, the anti-drop cap 3 includes a cap end 31 and a rod end 32, the shell 2 includes a covering portion 21 and a connecting portion 22, the covering portion 21 is used to cover the outside of the short section body 1, the connecting portion 22 is vertically arranged with the covering portion 21 and extends toward the inside of the short section body 1, the cap end 31 is fixedly connected with the rod end 32, and the rod end 32 can pass through the connecting portion 22 and be fixedly connected with the short section body 1, the cap end 31 can contact the end of the connecting portion 22 away from the support rod 7, and can effectively limit the axial movement of the shell 2 relative to the short section body 1, prevent the shell 2 from accidentally falling off during use, ensure the integrity and stability of the resistivity measurement short section structure, and avoid damage to the internal electronic components 9 and the like due to the falling off of the shell 2, which affects the normal progress of the measurement work. On the basis of the existing support rod 7 connecting the short section body 1 and the shell 2, the anti-drop cap 3 further strengthens the connection relationship between the short section body 1 and the shell 2. By fixing the anti-drop cap 3, the connection between the short section body 1 and the shell 2 is made more secure and can withstand greater external forces. For example, in a complex underground environment, when dealing with tension, pressure and vibration in different directions, the stability of the overall structure is significantly improved.

[0036] As a preferred embodiment, the anti-drop cap 3 has a hexagonal inner hole on the upper part, which can be used as follows Figure 3The anti-drop cap installation tool shown is used to loosen or tighten the thread. The anti-drop cap installation tool is provided with a hexagonal block that can be used in conjunction with the hexagonal inner hole.

[0037] In some embodiments, the resistivity measurement nipple further includes a first sealing ring 6 and a second sealing ring 5. The first sealing ring 6 is fixedly arranged on the inner wall of the through hole of the connecting part 22 through which the rod end 32 passes, and is used to seal the gap between the rod end 32 and the through hole. The second sealing ring 5 is fixedly arranged on the end of the connecting part 22 away from the support rod 7, and is used to seal the gap between the cap end 31 and the connecting part 22. The first sealing ring 6 is fixed on the inner wall of the through hole of the connecting part 22 through which the rod end 32 passes, and can effectively fill the gap between the rod end 32 and the through hole, preventing external liquid, gas and other media from entering the interior of the resistivity measurement nipple through the gap, avoiding damage or interference to the internal electronic components 9, coil parts 8, coils, etc., and ensuring the normal operation of the measurement nipple. The second sealing ring 5 is fixedly arranged on the end of the connecting part 22 away from the support rod 7, and can form a sealing barrier at the connection between the connecting part 22 and other components, further enhancing the sealing of the entire resistivity measurement nipple, and cooperating with the first sealing ring 6 to achieve multiple sealing protections, and better prevent the intrusion of external substances.

[0038] It should be noted that the first sealing ring 6 and the second sealing ring 5 are both O-rings, which can be made of rubber or silicone.

[0039] In some embodiments, the anti-drop cap 3 is connected to the short section body 1 by threads, and the threaded connection makes the disassembly and installation of the short section body 1 and the shell 2 more convenient and can ensure a stable connection.

[0040] In some embodiments, the resistivity measuring pup joint further comprises an anti-drop clamp 11 and a resistance member arranged in the cavity of the pup joint body 1, the anti-drop clamp 11 is axially movable and circumferentially fixedly arranged in the cavity of the pup joint body 1 (that is, the anti-drop clamp 11 can move axially in the cavity, but cannot rotate circumferentially but is relatively fixed), a key block 111 is arranged at the first end of the anti-drop clamp 11, a key groove 33 is arranged at one end of the anti-drop cap 3 close to the pup joint body 1, and two ends of the resistance member are respectively connected to the pup joint body 1 and the second end of the anti-drop clamp 11, and under the resistance of the resistance member, the key block 111 can be stuck in the key groove 33. The anti-drop clamp 11 is set in an axially sliding and circumferentially fixed manner. Specifically, the cross-section of the anti-drop clamp 11 can be hexagonal, that is, the part where the anti-drop clamp 11 is connected to the cavity is a hexagonal prism, and the cavity is also a hexagonal prism, which can ensure that the anti-drop clamp 11 will not rotate arbitrarily during operation, ensure that the key block 111 and the key slot 33 always maintain a correct matching relationship, and improve the convenience of installation and the reliability of the connection. It should be noted that the anti-rotation method of setting the key block 111 and the key slot 33 is mainly for the threaded connection between the anti-drop cap 3 and the short section body 1, which has the risk of relative rotation. The setting of the key block 111 and the key slot 33 can largely avoid the occurrence of such risks, prevent the problem of loosening of the thread due to vibration, and avoid failure of the connection between the anti-drop cap 3 and the short section body 1.

[0041] As a preferred embodiment, the lower part of the anti-drop clamp 11 is a hexagonal structure, which is installed in the cavity of the short section body 1 and can be used as follows: Figure 5 The anti-drop clamp installation tool shown in the figure is used for operation. Specifically, the anti-drop cap 3 is connected to the short section body 1 through a thread. After the quick connection is in place, use Figure 5 The anti-drop clamp installation tool pulls the anti-drop clamp 11 downward. Specifically, the anti-drop clamp installation tool can be used in conjunction with the anti-drop clamp 11, and the anti-drop cap 3 is continued to be rotated. When the anti-drop cap 3 is in place, loosen Figure 5 The anti-drop clamp installation tool is used, and the anti-drop clamp 11 moves upward under the action of the disc spring 12, and the key block 111 of the anti-drop clamp 11 cooperates with the key slot 33 at the lower end of the anti-drop cap 3 to achieve locking and anti-rotation. When the inclination angle of the coil needs to be changed, the anti-drop clamp installation tool can be used to pull the anti-drop clamp 11 downward, that is, away from one end of the anti-drop cap 3, and then the anti-drop cap installation tool is used to disassemble the anti-drop cap 3 from the short section body 1, and then the housing 2 can be pulled out relative to the short section body 1 to adjust the coil angle.

[0042] In some embodiments, the resistance member is a disc spring 12, and the disc spring 12 is always in a compressed state. The disc spring 12 is always in a compressed state, and can continuously provide a stable resistance force for the anti-drop clamp 11, ensuring that the key block 111 on the anti-drop clamp 11 is always tightly inserted into the key slot 33 of the anti-drop cap 3. Even when the measuring short section is disturbed by vibration, impact or other external forces, a reliable connection can be maintained to prevent the anti-drop cap 3 from loosening or falling off, thereby ensuring the stability of the entire measuring short section structure. Moreover, the disc spring 12 has excellent buffering and vibration absorption capabilities. During the operation of the measuring short section, when encountering complex working conditions such as strong vibration and impact underground, the disc spring 12 can absorb and consume these energies, reduce the direct impact on the anti-drop clamp 11, the anti-drop cap 3 and the short section body 1 and other components, effectively protect each component, reduce the risk of component damage, and extend the service life of the measuring short section.

[0043] In some embodiments, the resistivity measurement sub also includes a first joint 4, which is fixedly connected to the connection portion 22, and is used to connect the drill pipe. The first joint 4 is a component for connecting the measurement sub and the drill pipe. Specifically, the first joint 4 is threadedly connected to the drill pipe, so that the resistivity measurement sub can be smoothly installed on the drill pipe, and can be lowered into the well along with the drill pipe to achieve resistivity measurement of the target position in a working environment, and can provide a reliable connection method to ensure that the measurement sub will not fall off the drill pipe during operation, thereby ensuring the normal progress of the measurement work.

[0044] In some embodiments, a medium injection hole is provided on the covering portion 21, and the medium injection hole can be used to allow the medium to enter the installation space, and the medium injection hole can be blocked by the plug 10; the existence of the medium injection hole enables specific medium to be injected into the installation space when necessary. For example, in order to protect the internal electronic components 9, coil parts 8 and coils and other components, insulating, moisture-proof or anti-corrosion media can be injected to improve the working environment inside the measuring short section and improve its performance and service life. Specific liquids can also be injected to adjust certain parameters of the measuring short section to meet different measurement requirements. For example, oil is injected. Oil is not only non-conductive, but also can fill the installation space, so that the shell 2 is not easily deformed by external pressure.

[0045] The plug 10 includes a screw plug and a sealing ring, preferably an ED ring. A threaded hole is provided on the cover 21, and the screw plug can pass through the ED ring and be threadedly connected to the threaded hole. The ED ring in the plug 10 is a component with good sealing performance. The screw plug passes through the ED ring and is threadedly connected to the threaded hole of the cover 21, which can effectively block the medium injection hole after the medium is injected, prevent external liquids, gases and other media from entering the installation space, and ensure the stability of the internal environment. At the same time, it can also prevent the injected medium from leaking out, ensuring that the injected medium plays its due role.

[0046] Embodiment 2

[0047] This embodiment also provides a drilling device, including the resistivity measurement sub in the first embodiment, which can easily change the inclination angle of the coil and facilitate the conversion between azimuthal resistivity measurement and conventional resistivity measurement.

[0048] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A resistivity measurement nipple, characterized in that: It includes a short section body and multiple coil parts, the coil parts can be sleeved on the short section body and deformed, and the short section body is provided with electronic components, each of the coil parts is provided with a coil, the coil can be connected with the electronic component by electrical signals, and the coil parts can have different inclination angles by offsetting different angles.

2. The resistivity measurement nipple according to claim 1, characterized in that: It also includes a shell and a mounting groove, wherein the mounting groove is arranged on the outside of the short section body, and the electronic component is arranged in the mounting groove. The shell is used to be sleeved on the outside of the short section body, and an installation space can be formed between the inner wall of the shell and the outside of the short section body, and the installation space is used to accommodate the coil component.

3. The resistivity measurement nipple according to claim 2, characterized in that: It also includes a plurality of support rods, which are arranged in the installation space along the length direction of the short section body. The connection between two adjacent coil parts and the connection between the coil part close to the short section body and the short section body are both connected through the support rods. By changing the length of the support rod between the coil part and the short section body, the circumferential distance of the coil part from the end of the short section body can be changed; by changing the length of the support rod between the coil part close to the short section body and the coil part adjacent to the coil part close to the short section body, the offset angle of the coil part adjacent to the coil part close to the short section body can be changed.

4. The resistivity measurement nipple according to claim 3, characterized in that: It also includes an anti-drop cap, which includes a cap end and a rod end, and the shell includes a covering portion and a connecting portion, the covering portion is used to cover the outside of the short section body, the connecting portion is vertically arranged with the covering portion and extends toward the inside of the short section body, the cap end is fixedly connected with the rod end, and the rod end can pass through the connecting portion and be fixedly connected with the short section body, and the cap end can contact the end of the connecting portion away from the support rod.

5. The resistivity measurement nipple according to claim 4, characterized in that: It also includes a first sealing ring and a second sealing ring. The first sealing ring is fixedly arranged on the inner wall of the through hole of the connecting part for the rod end to pass through, and the second sealing ring is fixedly arranged on an end of the connecting part away from the supporting rod.

6. The resistivity measurement nipple according to claim 4, characterized in that: It also includes an anti-drop clamp and a resistance member arranged in the cavity of the short section body, the anti-drop cap is connected to the short section body by threads, the anti-drop clamp is axially sliding and circumferentially fixed in the cavity of the short section body, the first end of the anti-drop clamp is provided with a key block, the anti-drop cap is provided with a key slot at one end close to the short section body, the two ends of the resistance member are respectively connected to the short section body and the second end of the anti-drop clamp, and under the resistance of the resistance member, the key block can be stuck in the key slot.

7. The resistivity measurement nipple according to claim 6, characterized in that: The resisting member is a disc spring, and the disc spring is always in a compressed state.

8. The resistivity measurement sub according to claim 4, characterized in that: It also includes a first joint, which is fixedly connected to the connecting part and is used to connect a drill pipe.

9. The resistivity measurement nipple according to claim 4, characterized in that: The covering portion is provided with a medium injection hole, the medium injection hole can be used to allow the medium to enter the installation space, and the medium injection hole can be blocked by a plug; Wherein, the plug includes a screw plug and a sealing ring, a threaded hole is provided on the covering portion, and the screw plug can pass through the sealing ring and be threadedly connected to the threaded hole.

10. A drilling device, characterized in that: It comprises the resistivity measurement short section as described in any one of claims 1 to 9.

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