Underground medium-distance torque detection nipple

Abstract

The utility model belongs to the technical field of drilling rod torque detection, and particularly relates to an underground medium-distance torque detection short section which comprises a detection center pipe and receiving center pipes, a detection short section is arranged on the outer surface of the detection center pipe, a receiving short section is arranged on the outer surface of the other receiving center pipe, and the detection short section is connected with the receiving short section. The detection short section detects the torque of the drill rod and then transmits the torque to the receiving short section. According to the underground medium-distance torque detection pup joint, the detection pup joint and the receiving pup joint can be stably fixed with a drill rod by arranging the fixing device, and a pressing block descends, so that after a trapezoidal groove can press a fixed sealing block, the fixed sealing block can be attached to the drill rod; the pressing block is in threaded connection with the inner wall of the detection center pipe and the inner wall of the receiving center pipe, the position of the pressing block can be stably fixed, meanwhile, the threaded sleeve is in threaded connection with the drill rod again, double-layer fixing can be achieved, and meanwhile the threaded sleeve can seal the drill rod and the pressing block.

Description

Technical Field

[0001] The utility model relates to the technical field of drill pipe torque detection, in particular to a downhole medium-distance torque detection sub. Background Technique

[0002] The importance of downhole drill pipe torque detection lies in ensuring the safety and sealing performance of the drill pipe. If the make-up torque of the drill pipe caused by humans or equipment fails to meet the requirements, it will directly affect the sealing performance of the thread connection. Therefore, conducting downhole drill pipe torque detection is an important measure to ensure downhole operation safety and improve work efficiency. Torque detection also involves the fastening degree of the equipment and the torsional resistance performance of the drill pipe, which is crucial for ensuring the safe operation of the equipment.

[0003] Chinese Patent with the authorization announcement number CN101603420B discloses a drill pipe torque telemetry method and device. A lower sub is installed between the kelly and the drill pipe to collect and send data, and an upper sub is installed at the bell mouth position to receive and transmit data. The torque signal collected by the parameter acquisition board in the lower sub is transmitted to the transmitting coil and converted into an alternating magnetic field. The receiving coil in the upper sub converts the induced alternating magnetic field into an alternating electric signal and transmits it to the demodulation board for demodulation to obtain the torque signal. This signal is transmitted to a computer or a display recording device through a data cable and a connector. The advantages of the present invention are that it can directly, real-time, and effectively complete the measurement and upload of downhole drill pipe torque, with low power consumption and convenient for function expansion.

[0004] However, in the above scheme, the torque detection sub is connected by nuts and cannot be stably fixed, resulting in loosening of the detection sub, affecting the contact between the torque detection sub and the drill pipe, and causing errors in the detection results. Content of the Utility Model

[0005] Based on the technical problem that the existing torque detection sub is connected by nuts and cannot be stably fixed, resulting in loosening of the detection sub, affecting the contact between the torque detection sub and the drill pipe, and causing errors in the detection results, the utility model proposes a downhole medium-distance torque detection sub.

[0006] A downhole medium-distance torque detection sub proposed by the utility model includes a detection center tube and a receiving center tube. A detection sub is arranged on the outer surface of the detection center tube, and a receiving sub is arranged on the outer surface of the other receiving center tube. The detection sub detects the torque of the drill pipe and then transmits it to the receiving sub.

[0007] Fixing devices are arranged at one ends of the detection center tube and the receiving center tube. The fixing device includes a fixing and sealing block, and the fixing and sealing block deflects to fix one end of the drill pipe.

[0008] Preferably, the detection sub-section includes a detection sub-section housing, a switch, a transmitting coil, a strain gauge, a wireless node bracket, and a wireless node. The detection sub-section housing is threadedly connected to the outer surface of the detection central tube. The switch is fixedly installed on the outer surface of the detection central tube. The transmitting coil, the strain gauge, the wireless node bracket, and the wireless node are all fixedly installed on the outer surface of the detection central tube.

[0009] Through the above technical solution, the detection sub-section is equipped with an adhesive strain gauge, a signal acquisition and transmission module, a battery, etc. When the drill pipe rotates, it generates torque, causing the elastic shaft and the strain gauge in the detection sub-section to undergo slight deformation under the torque, and outputting a weak voltage signal from the strain bridge. The signal is respectively carrier-communicated using the transmitting coil and the receiving coil. After the voltage signal is processed, the receiving sub-section emits a wireless signal, thereby realizing real-time detection of the torque of the drill pipe.

[0010] Preferably, the receiving sub-section includes a receiving sub-section housing, an antenna, a receiving coil, a signal transmitter assembly, and an antenna protection plate. The receiving sub-section housing is threadedly connected to the outer surface of the receiving central tube. The antenna, the receiving coil, the signal transmitter assembly, and the antenna protection plate are all fixedly installed on the outer surface of the receiving central tube.

[0011] Through the above technical solution, the receiving sub-section can receive the detected data, facilitating torque detection of the drill pipe underground.

[0012] Preferably, battery brackets are fixedly installed on the outer surfaces of the detection central tube and the receiving central tube, and battery assemblies are fixedly installed on the outer surfaces of the battery brackets.

[0013] Through the above technical solution, the battery assembly provides power for the detection sub-section and the receiving sub-section.

[0014] Preferably, the fixing device further includes a spring steel plate, which is fixedly installed on the inner walls of the detection central tube and the receiving central tube, and one end of the spring steel plate is fixedly installed with one end of the fixed sealing block.

[0015] Through the above technical solution, after the fixed sealing block is squeezed, it can contact the surface of the drill pipe to fix the drill pipe.

[0016] Preferably, a pressing block is threadedly connected to the inner walls of the detection central tube and the receiving central tube. A trapezoidal groove is formed in the inner wall of the pressing block, and the outer surface of the fixed sealing block contacts the inner wall of the trapezoidal groove.

[0017] Through the above technical solution, after the pressing block is threaded down, it can squeeze the fixed sealing block, causing the fixed sealing block to gather and release the drill pipe, completing stable fixation of the drill pipe.

[0018] Preferably, a threaded sleeve is threadedly connected to the inner wall of the pressing block, and one end of the threaded sleeve is threadedly connected to one end of the drill pipe.

[0019] Through the above technical solution, by rotating the threaded sleeve, it can be threadedly connected with the threads on the drill pipe, thereby fixing the drill pipe again. The double-layer fixation of the drill pipe can maintain a stable fixation between the drill pipe and the detection short section and the receiving short section.

[0020] The beneficial effects of the present utility model are as follows:

[0021] By setting the fixing device, a stable fixation can be achieved between the detection short section and the receiving short section and the drill pipe. After the pressing block descends, the trapezoidal groove can press the fixed sealing block, enabling the fixed sealing block to fit with the drill pipe. The pressing block is threadedly connected to the inner walls of the detection center pipe and the receiving center pipe, which can stably fix the position of the pressing block. At the same time, by threadedly connecting the threaded sleeve with the drill pipe again, double-layer fixation can be carried out. Meanwhile, the threaded sleeve can seal between the drill pipe and the pressing block, solving the technical problem that the existing torque detection short section is connected by nuts and cannot be stably fixed, resulting in loosening of the detection short section, affecting the contact between the torque detection short section and the drill pipe, and causing errors in the detection results. Description of the Drawings

[0022] Figure 1 Schematic diagram of a downhole medium-distance torque detection short section proposed by the present utility model;

[0023] Figure 2 Three-dimensional view of the transmitting coil structure of a downhole medium-distance torque detection short section proposed by the present utility model;

[0024] Figure 3 Three-dimensional view of the wireless node structure of a downhole medium-distance torque detection short section proposed by the present utility model;

[0025] Figure 4 Three-dimensional view of the receiving short section structure of a downhole medium-distance torque detection short section proposed by the present utility model;

[0026] Figure 5 Three-dimensional view of the receiving coil structure of a downhole medium-distance torque detection short section proposed by the present utility model;

[0027] Figure 6 Three-dimensional view of the signal transmitter component structure of a downhole medium-distance torque detection short section proposed by the present utility model;

[0028] Figure 7Stereogram of the threaded casing structure of a downhole medium-distance torque detection sub proposed by the present utility model;

[0029] Figure 8 Stereogram of the pressing block structure of a downhole medium-distance torque detection sub proposed by the present utility model;

[0030] Figure 9 Stereogram of the fixed sealing block structure of a downhole medium-distance torque detection sub proposed by the present utility model.

[0031] In the figure: 1. Detection center tube; 11. Receiving center tube; 2. Detection sub; 21. Detection sub housing; 22. Switch; 23. Transmitting coil; 24. Strain gauge; 25. Wireless node bracket; 26. Wireless node; 3. Receiving sub; 31. Receiving sub housing; 32. Antenna; 33. Receiving coil; 34. Signal transmitter assembly; 35. Antenna protection plate; 4. Battery bracket; 41. Battery assembly; 5. Spring steel plate; 51. Fixed sealing block; 52. Pressing block; 53. Trapezoidal groove; 54. Threaded casing. Specific implementation mode

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0033] Refer to Figures 1-9 , a downhole medium-distance torque detection sub, including a detection center tube 1 and a receiving center tube 11. A detection sub 2 is arranged on the outer surface of the detection center tube 1, and a receiving sub 3 is arranged on the outer surface of the other receiving center tube 11. After detecting the torque of the drill pipe, the detection sub 2 transmits it to the receiving sub 3.

[0034] Specifically, in order to detect the torque of the drill pipe, the detection sub 2 includes a detection sub housing 21, a switch 22, a transmitting coil 23, a strain gauge 24, a wireless node bracket 25 and a wireless node 26. The detection sub housing 21 is threadedly connected to the outer surface of the detection center tube 1, the switch 22 is fixedly installed on the outer surface of the detection center tube 1, and the transmitting coil 23, the strain gauge 24, the wireless node bracket 25 and the wireless node 26 are all fixedly installed on the outer surface of the detection center tube 1; the switch 22 includes a switch mounting frame, a switch protection cover and an O-ring. When the drill pipe rotates to generate torque, the elastic shaft and strain gauge in the detection sub 2 are subjected to torque to produce a small deformation, and the weak voltage signal output by the strain bridge is respectively used for carrier communication by the transmitting coil 23 and the receiving coil 33. After the voltage signal is processed, the receiving sub 3 emits a wireless signal, so as to realize the real-time detection of the torque of the drill pipe.

[0035] Specifically, in order to receive the detected signal, the receiving sub 3 includes a receiving sub housing 31, an antenna 32, a receiving coil 33, a signal transmitter assembly 34, and an antenna protection plate 35. The receiving sub housing 31 is threadedly connected to the outer surface of the receiving central tube 11. The antenna 32, the receiving coil 33, the signal transmitter assembly 34, and the antenna protection plate 35 are all fixedly installed on the outer surface of the receiving central tube 11. The data detected can be received through the receiving sub 3, which facilitates torque detection of the drill pipe underground. The signal transmitter assembly 34 includes a model generator bracket and a signal generator, and the signal generator is fixedly installed on the model generator bracket.

[0036] Specifically, in order to supply power to the detection sub 2 and the receiving sub 3, battery brackets 4 are fixedly installed on the outer surfaces of the detection central tube 1 and the receiving central tube 11, and battery assemblies 41 are fixedly installed on the outer surfaces of the battery brackets 4.

[0037] Fixing devices are provided at one end of both the detection central tube 1 and the receiving central tube 11. The fixing device includes a fixing seal block 51, and the fixing seal block 51 deflects to fix one end of the drill pipe.

[0038] Specifically, in order to complete the fixation of the drill pipe, the fixing device further includes a spring steel plate 5. The spring steel plate 5 is fixedly installed on the inner walls of the detection central tube 1 and the receiving central tube 11, and one end of the spring steel plate 5 is fixedly installed with one end of the fixing seal block 51. After being squeezed, the fixing seal block 51 can contact the surface of the drill pipe to fix the drill pipe.

[0039] In order to gather the fixing seal block 51, a pressing block 52 is threadedly connected to the inner walls of the detection central tube 1 and the receiving central tube 11. A trapezoidal groove 53 is formed in the inner wall of the pressing block 52, and the inner wall of the trapezoidal groove 53 contacts the outer surface of the fixing seal block 51. After the pressing block 52 is threadedly lowered, the fixing seal block 51 can be squeezed, so that the fixing seal block 51 gathers to release the drill pipe, completing the stable fixation of the drill pipe.

[0040] Specifically, in order to fix the drill pipe, a threaded sleeve 54 is threadedly connected to the inner wall of the pressing block 52, and one end of the threaded sleeve 54 is threadedly connected to one end of the drill pipe. By rotating the threaded sleeve 54, it can be threadedly connected to the threads on the drill pipe, thereby fixing the drill pipe again. The double fixation of the drill pipe can maintain the stable fixation between the drill pipe and the detection sub 2 and the receiving sub 3.

[0041] By setting up a fixing device, stable fixation can be achieved between the detection short section 2 and the receiving short section 3 and the drill pipe. After the pressing block 52 descends, the trapezoidal groove 53 can press the fixed sealing block 51, enabling the fixed sealing block 51 to fit the drill pipe. The pressing block 52 is threadedly connected to the inner walls of the detection central pipe 1 and the receiving central pipe 11, which can stably fix the position of the pressing block 52. At the same time, the threaded sleeve 54 is threadedly connected to the drill pipe again, enabling double-layer fixation. Meanwhile, the threaded sleeve 54 can seal between the drill pipe and the pressing block 52, solving the technical problem that the existing torque detection short section 2 is connected by nuts and cannot be stably fixed, resulting in loosening of the detection short section 2, affecting the contact between the detection short section 2 and the drill pipe, and causing errors in the detection results.

[0042] Working principle: The detection short section housing 21 and the receiving short section housing 31 are sleeved on the drill pipe. By rotating the pressing block, after the pressing block 52 descends, the trapezoidal groove 53 can squeeze the fixed sealing block 51, and the fixed sealing block 51 contacts the outer surface of the drill pipe, and the spring steel plate 5 deforms, completing the fixation of one end of the drill pipe. After rotating the threaded sleeve 54 upward, the threaded sleeve 54 is threadedly connected to the thread groove on the outer surface of the drill pipe, completing the fixation of the drill pipe.

[0043] The detection short section 2 and the receiving short section 3 are respectively equipped with a transmitting coil 23 and a receiving coil 33. When the drill pipe rotates to generate torque, the elastic shaft and strain gauge in the detection short section 2 are torqued to produce small deformations, and the weak voltage signal output by the strain bridge is respectively carrier-communicated by the transmitting coil 23 and the receiving coil 33. After the voltage signal is processed, a wireless signal is sent out by the receiving short section 3, thereby realizing real-time detection of the torque of the drill pipe. When the drill pipe rotates to generate torque, the elastic shaft and the strain gauge in the strain gauge 24 in the detection short section 2 are torqued to produce small deformations, and the weak voltage signal output by the strain bridge is respectively carrier-communicated by the transmitting coil 23 and the receiving coil 33. After the voltage signal is processed, a wireless signal is sent out by the receiving short section 3.

[0044] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A downhole medium-distance torque detection sub, comprising a detection central tube (1) and a receiving central tube (11), characterized in that: A detection short joint (2) is provided on the outer surface of the detection central pipe (1), and a receiving short joint (3) is provided on the outer surface of the other receiving central pipe (11). After detecting the torque of the drill pipe, the detection short joint (2) transmits it to the receiving short joint (3). Fixing devices are provided at one end of both the detection central pipe (1) and the receiving central pipe (11). The fixing device includes a fixing and sealing block (51), and the fixing and sealing block (51) deflects to fix one end of the drill pipe.

2. The downhole medium-distance torque detection nipple according to claim 1, characterized in that: The detection short joint (2) includes a detection short joint housing (21), a switch (22), a transmitting coil (23), a strain gauge (24), a wireless node bracket (25), and a wireless node (26). The detection short joint housing (21) is threadedly connected to the outer surface of the detection central pipe (1), the switch (22) is fixedly installed on the outer surface of the detection central pipe (1), and the transmitting coil (23), the strain gauge (24), the wireless node bracket (25), and the wireless node (26) are all fixedly installed on the outer surface of the detection central pipe (1).

3. The downhole medium-distance torque detection nipple according to claim 1, wherein: The receiving short joint (3) includes a receiving short joint housing (31), an antenna (32), a receiving coil (33), a signal transmitter assembly (34), and an antenna protection plate (35). The receiving short joint housing (31) is threadedly connected to the outer surface of the receiving central pipe (11), and the antenna (32), the receiving coil (33), the signal transmitter assembly (34), and the antenna protection plate (35) are all fixedly installed on the outer surface of the receiving central pipe (11).

4. A downhole medium-distance torque detection sub as claimed in claim 1, characterized in that: Battery brackets (4) are fixedly installed on the outer surfaces of both the detection central pipe (1) and the receiving central pipe (11), and battery assemblies (41) are fixedly installed on the outer surfaces of the battery brackets (4).

5. The downhole medium-distance torque detection nipple according to claim 1, characterized in that: The fixing device further includes a spring steel plate (5), and the spring steel plate (5) is fixedly installed on the inner walls of the detection central pipe (1) and the receiving central pipe (11). One end of the spring steel plate (5) is fixedly installed with one end of the fixing and sealing block (51).

6. The downhole medium-distance torque detection nipple according to claim 1, characterized in that: A pressing block (52) is threadedly connected to the inner walls of the detection central pipe (1) and the receiving central pipe (11). A trapezoidal groove (53) is formed in the inner wall of the pressing block (52), and the outer surface of the fixing and sealing block (51) is in contact with the inner wall of the trapezoidal groove (53).

7. The downhole medium-distance torque detection sub-joint according to claim 6, wherein: A threaded sleeve (54) is threadedly connected to the inner wall of the pressing block (52), and one end of the threaded sleeve (54) is threadedly connected to one end of the drill pipe.

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