A small-diameter measurement device for resistivity while drilling

Abstract

The present application relates to the field of drilling operation while drilling measurement, and particularly relates to a small-diameter while-drilling resistivity measuring device, which comprises a drill bit installed at the bottom of a drill rod, a main shaft rotatably arranged in the drill rod and connected with the drill bit at the bottom, hinged plates symmetrically arranged at the upper end of the drill rod, a ring cavity opened in the interior of the drill rod, a ring frame with a U-shaped cross section symmetrically and slidably arranged in the ring cavity, a receiving end and a transmitting end respectively installed in the corresponding ring frames, and an installation unit arranged in the ring frame for limiting the transmitting end and the receiving end, wherein the angle and distance of the transmitting end and the receiving end are controlled, and a buffering and damping mechanism is combined to realize efficient detection of measured objects at different depths and angles in a complex geological environment, effectively absorb the vibration generated by the drill bit during drilling, ensure that the transmitting end and the receiving end work in a stable environment, avoid measurement errors caused by vibration, and greatly improve the detection accuracy and reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of drilling operations, particularly to a small-diameter while-drilling resistivity measurement device. BACKGROUND

[0002] The small-diameter while-drilling resistivity measurement device is an important component of modern oil and gas drilling technology. As the difficulty of oil and gas exploration increases and the exploitation environment becomes more complex, traditional drilling methods cannot meet the needs of precise guidance and efficient exploitation. In this context, the while-drilling measurement technology emerged as the times required. As a key device, the small-diameter while-drilling resistivity measurement device can measure the resistivity of the formation in real time during drilling, helping engineers to conduct geological steering and formation evaluation, thereby improving drilling accuracy and oil and gas recovery.

[0003] The existing while-drilling measurement device is usually installed on a fixed non-rotating drill pipe, which limits the detection angle of the electromagnetic wave signal. In addition, during drilling, the severe vibration and impact of the drilling tool can easily cause the components of the measurement device to wear and damage, thereby affecting the measurement accuracy and the reliability of the device. However, with the advancement of technology, such as the successful application of the ZTS-42AP electromagnetic wave while-drilling measurement system under certain conditions, and the modular design and wireless transmission technology of the MWD wireless while-drilling inclinometer, the while-drilling measurement technology is constantly improving to adapt to more complex drilling environments.

[0004] In the prior art, a while-drilling measurement device is disclosed in patent CN116104485A. At least two installation long grooves are arranged on the outer side of the middle part of the drill collar body along the circumference, at least one installation long groove is provided with a transmitting short section, at least one installation long groove is provided with a battery short section, and a long cover plate is fixedly installed on the outer side of the drill collar body corresponding to the position of each installation long groove. By arranging the battery short section, the transmitting short section, the inner pressure sensor, and the outer pressure sensor in the drill collar body, the accuracy of engineering parameter measurement and the stability of data transmission are improved. By arranging the first radial channel and the axial channel, wiring and cabling in the drill collar body are facilitated.

[0005] However, although this technology solves some of the original problems, there are still aspects that need to be further optimized to better meet the actual detection needs.

[0006] 1. The installation and maintenance process of the above-mentioned prior art is relatively complex, involving the disassembly and installation of multiple components, which increases the burden on the operating personnel in the downhole operation environment and increases the risk of operation errors. In addition, the fixing method of the inner pressure sensor and the outer pressure sensor mainly depends on the inner annular cover plate and the outer annular cover plate. This fixing method may not provide sufficient stability when facing high-strength vibration and impact, which can easily cause the sensor to shift or be damaged, thereby affecting the measurement accuracy.

[0007] 2. The replacement process of the battery short section in the above-mentioned prior art is relatively cumbersome, requiring the disassembly of multiple components, which increases the operation time and may delay the work progress in an emergency situation. Secondly, the distance and position between the transmitting short section and the sensor of the device in the above-mentioned prior art are fixed, and cannot be adaptively adjusted according to the actual geological conditions. As a result, under certain special geological conditions, the measurement effect is not ideal and the performance of the device cannot be fully utilized.

[0008] Therefore, based on the above-stated viewpoints, there is still room for improvement in the existing measurement while drilling devices. Summary of the Invention

[0009] In order to solve the above problems, the present invention provides a small-diameter resistivity while drilling measurement device, including a drill bit installed at the bottom of a drill rod, a main shaft with a bottom connected to the drill bit rotatably arranged inside the drill rod, a hinged plate symmetrically arranged at the upper end of the drill rod, an annular cavity opened inside the drill rod, an annular frame with a U-shaped cross-section symmetrically slidably arranged in the annular cavity, a receiving end and a transmitting end are respectively installed in the upper and lower corresponding annular frames, and an installation unit for limiting the transmitting end and the receiving end is provided in the annular frame.

[0010] The installation unit includes multiple partition plates evenly arranged on the inner wall of the annular frame along the axis. The space between two adjacent partition plates forms an installation cavity. Pull springs are provided on the upper and lower inner walls of the installation cavity, and an installation frame is provided between the corresponding pull springs.

[0011] Preferably, the receiving end and the transmitting end are detachably provided in the mounting frames on the upper and lower annular frames respectively, and extension plates are provided on both sides of the mounting frames, and an anti-vibration plate is provided at one end of the extension plate.

[0012] Preferably, a clamping assembly for clamping and limiting the annular frame is also provided on the inner wall of the annular cavity, including several circular grooves arranged on the inner wall of the annular cavity and distributed along its extension section, a cylinder is provided in the circular groove, and a circular plate is provided in the cylinder by means of a push spring.

[0013] Preferably, one side of the circular plate slides through the cylinder and the inner wall of the annular cavity and comes into conflict with the inner diameter of the adjacent annular frame.

[0014] Preferably, a conducting component for conducting electricity to the transmitting end and the receiving end is also provided inside the drill rod, including a bending groove opened in the drill rod, and the bending groove is connected to the corresponding circular groove, and adjacent cylinders are connected in series with a wire located in the bending groove, and the wire of the uppermost cylinder extends to the upper end of the drill rod corresponding to the hinged plate.

[0015] Preferably, a structure cavity is arranged inside the annular frame, a conductive ring plate is arranged in the structure cavity, the circular plate is in contact with the conductive ring plate, a cable is arranged on the inner side wall of the installation cavity, one side of the cable is connected to the corresponding transmitting end or receiving end, and the other side of the cable is connected to the conductive ring plate through the inner side wall of the installation cavity.

[0016] Preferably, a conductive plate is arranged in the hinged plate, and the bottom of the conductive plate is connected to the wire.

[0017] Preferably, a contact assembly for enhancing signals is arranged on one side of the transmitting end and the receiving end, the contact assembly comprises a telescopic plate arranged on the side of the transmitting end and the receiving end away from the corresponding installation cavity, and a contact arc plate is arranged at the telescopic end of the telescopic plate and corresponds to the inner wall of the annular cavity.

[0018] Preferably, a plurality of reset springs are arranged on the inner wall of the annular cavity, the reset springs are arranged in a ring shape and uniformly arranged along the extension section, the reset springs arranged in a ring shape correspond to the installation cavities one by one, and the longitudinal direction of the reset springs corresponds to the circular groove.

[0019] Preferably, a passive arc plate is arranged on one side of the reset spring, and the passive arc plate is in contact with the adjacent contact arc plate.

[0020] In summary, the present application has at least one of the following beneficial technical effects:

[0021] Firstly, the present application controls the angle and distance of the transmitting end and the receiving end, and combines the buffering and damping mechanism, so as to realize efficient detection of measured objects with different depths and angles in complex geological environments, effectively absorb the vibration generated by the drill bit during drilling, ensure that the transmitting end and the receiving end work in a stable environment, avoid measurement errors caused by vibration, and greatly improve the detection accuracy and reliability.

[0022] Secondly, the present application realizes flexible assembly and convenient maintenance of the device through modular design and detachable structure, so that the transmitting end and the receiving end can be replaced and upgraded according to requirements, the pin shaft is used to connect the external extension rod and the drill rod, which is convenient for disassembly and assembly, and the detection depth can be flexibly adjusted. In addition, the cooperation of the conductive ring plate and the circular plate continuously and stably transmits the electrical signal during the rotation of the annular frame, solves the problems of wire winding and unstable signal transmission caused by rotation in the traditional device, and improves the versatility and reliability of the device.

[0023] Thirdly, the present application limits the annular frame through the clamping assembly, effectively prevents the annular frame from falling in the static state, improves the safety of the device, and adopts a compact integrated design to integrate multiple functional components in the drill rod, so that the structure is compact and the space utilization rate is high. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below in combination with the drawings and examples.

[0025] Figure 1 is the schematic diagram of the body structure of the present application.

[0026] Figure 2 is the schematic diagram of the cross-section structure of the body of the present application.

[0027] Figure 3 is the schematic diagram of the structure of the ring frame and the mounting unit of the present application.

[0028] Figure 4 is the enlarged view of the partial structure at A in the present application. Figure 3

[0029] Figure 5 is the schematic diagram of the structure of the clamping assembly and the conducting assembly of the present application.

[0030] Figure 6 is the enlarged view of the partial structure at B in the present application. Figure 5

[0031] is the enlarged view of the partial structure at C in the present application. Figure 7 Figure 5

[0032] Figure 8 is the schematic diagram of the structure of the contact assembly of the present application.

[0033] Figure 9 is the schematic diagram of the cooperation of the contact assembly and the mounting unit of the present application.

[0034] Figure 10 is the schematic diagram of the structure of the driving unit of the present application.

[0035] Figure 11 is the enlarged view of the partial structure at D in the present application. Figure 10

[0036] is the planar cross-sectional view of the driving unit of the present application. Figure 12

[0037] is the schematic diagram of the connection of the external extension rod and the drill rod of the present application. Figure 13

[0038] is the cross-sectional view of the external extension rod of the present application. Figure 14

[0039] is the enlarged view of the partial structure at E in the present application. Figure 15 Figure 14

[0040] ​​​​​In the figure, 1, drill pipe; 10, drill bit; 11, main shaft; 12, hinged plate; 13, annular cavity; 14, annular frame; 15, receiving end; 16, transmitting end; 2, mounting unit; 20, partition plate; 21, mounting cavity; 22, pull spring; 23, mounting frame; 24, extension plate; 25, anti-vibration plate; 3, clamping assembly; 30, cylinder; 31, circular plate; 4, conducting assembly; 40, wire; 41, conductive ring plate; 42, cable; 43, conducting plate; 5, contact assembly; 50, telescopic plate; 51, contact arc plate; 52, reset push spring; 53, passive arc plate; 6, drive unit; 60, drive frame; 61, reciprocating screw rod; 62, drive gear; 63, structure groove; 64, power gear; 65, containing groove; 66, electric push rod; 67, transmission gear; 68, double-sided gear ring; 69, inner gear ring; 7, external extension rod; 70, pin shaft. DETAILED DESCRIPTION

[0041] The following Figures 1 to 15 The embodiments of the present application are described in detail.

[0042] The embodiments of the present application disclose a small-diameter resistivity measurement device while drilling, which is mainly applied to the drilling process of a drill bit. The device emits a detection electric wave to the ground in the drilling direction through an electric wave emitting device, detects the ground resources and environment, and then receives the electric wave through a receiving device and analyzes it. In this process, two mounting devices can respectively mount a plurality of emitting devices and receiving devices, and during the detection process, the mounting devices drive the emitting devices and receiving devices to rotate to increase and change the emission area and angle of the electric wave. Furthermore, the distance between the emitting devices and receiving devices can be changed through the mounting devices to adapt to different detection scenes, further improving the applicability of the present application. The present application can also install wires inside the drill pipe and the extension drill pipe, extend the wires to the ground through the drill pipe extension connection, and directly supply power to the emitting devices and receiving devices through the ground power supply, thereby eliminating the need for replacing batteries in the prior art.

[0043] Embodiment one: refer to Figure 1 , Figure 2 and Figure 3 , which comprises a drill pipe 1, a drill bit 10, a main shaft 11, a hinged plate 12, an annular cavity 13, an annular frame 14, a receiving end 15, a transmitting end 16 and a mounting unit 2. The drill pipe 1 is provided with the drill bit 10 at the bottom. The drill pipe 1 is provided with the main shaft 11 connected with the drill bit 10 at the bottom. The main shaft 11 can drive the drill bit 10 to rotate after being driven by an external driving device, so that the drill bit 10 can drill. The upper side wall of the drill pipe 1 extends out of a structure similar to a ring-shaped disc, which is used to limit the main shaft 11, so that the main shaft 11 with a diameter much smaller than the inner diameter of the drill pipe 1 can rotate inside the drill pipe 1.

[0044] A hinged plate 12 is symmetrically provided at the upper end of the drill rod 1, and the hinged plate 12 allows the drill rod 1 to be connected to other drill rods 1 to extend the drilling distance of the drill bit 10; an annular cavity 13 is opened inside the drill rod 1, and an annular frame 14 with a U-shaped cross-section is symmetrically slidably provided in the annular cavity 13, and a receiving end 15 and a transmitting end 16 are respectively installed in the upper and lower corresponding annular frames 14, and an installation unit 2 for limiting the transmitting end 16 and the receiving end 15 is provided in the annular frame 14, that is, the installation unit 2 can drive the corresponding transmitting end 16 and the receiving end 15 to move in the up and down directions to change the distance between the transmitting end 16 and the receiving end 15 to adapt to the testing methods of different scenarios, and when driven by external force, the installation unit 2 can also drive the corresponding transmitting end 16 and the receiving end 15 to rotate to change the radio wave emission angle of the transmitting end 16 and increase the receiving range of the receiving end 15.

[0045] It should be noted that the transmitting end 16 and the receiving end 15 mentioned in the above implementation process are both optional conventional components, and their main functions are to transmit electromagnetic waves toward the drilling direction of the drill bit 10 and receive the electromagnetic waves transmitted back, which should be known to those skilled in the art, so they will not be described here.

[0046] Continue to refer to Figure 3 and Figure 4 As shown, an installation unit 2 for limiting the transmitting end 16 and the receiving end 15 is provided in the annular frame 14; specifically, the installation unit 2 includes a partition plate 20, an installation cavity 21, a pull spring 22, a installation frame 23, an extension plate 24 and an anti-vibration plate 25. Several partition plates 20 are evenly distributed on the inner wall of the annular frame 14 along the axis thereof. The space between two adjacent partition plates 20 forms an installation cavity 21. Except for the installation cavities 21 on both sides, the upper and lower inner walls of the remaining installation cavities 21 are all provided with pull springs 22, and an installation frame 23 is provided between the corresponding pull springs 22. That is, there is nothing in the installation cavities 21 on both sides. During the drilling process of the drill bit 10, vibration will be generated, and the drill rod 1 and the annular frame 14 will also vibrate. Therefore, the pull spring 22 can not only support the installation frame 23, but also buffer part of the vibration force.

[0047] The receiving end 15 and the transmitting end 16 are respectively arranged in the mounting frame 23 on the upper and lower annular frames 14 in a detachable manner, and the two sides of the mounting frame 23 are further provided with an extension plate 24, one end of the extension plate 24 is provided with a vibration isolation plate 25, that is, in the use process, the vibration force received by the corresponding transmitting end 16 and receiving end 15 is indirectly buffered by pulling the spring 22, and the extension plate 24 is used to support the vibration isolation plate 25, even if the mounting frame 23 has the buffering of the pulling spring 22, it will also produce a certain amplitude of shaking, that is, at this time the vibration isolation plate 25 will offset part of the shaking force of the mounting frame 23, so that the corresponding transmitting end 16 and receiving end 15 can work in a stable environment.

[0048] First, the transmitting end 16 is started to emit electromagnetic waves in the drilling direction of the drill bit 10 for detection, and the electromagnetic waves detected by the measured object will be reflected back, and the reflected electromagnetic waves will be received by the corresponding receiving end 15 to analyze the electromagnetic waves, if different angle measurement is needed, the two annular frames 14 can be driven to rotate by external force, so as to synchronously adjust the angle of the transmitting end 16 and the receiving end 15, and several receiving ends 15 are used to receive the electromagnetic waves transmitted by the corresponding transmitting end 16 at the lower end, each receiving end 15 corresponds to one transmitting end 16, so as to ensure that there is no receiving dead angle, prevent the electromagnetic waves emitted by the transmitting end 16 from not being completely received, thereby avoiding measurement error, in some special scenes, due to the influence of complex underground electromagnetic environment, the receiving range of the receiving end 15 will be affected to a certain extent, therefore, the upper and lower annular frames 14 are driven to move by external force, so as to reduce or increase the distance between the annular frames 14, so that the distance between the transmitting end 16 and the receiving end 15 changes.

[0049] Referring to Figure 5 and Figure 6 , that is, the inner wall of the annular cavity 13 is further provided with a clamping assembly 3 for clamping and limiting the annular frame 14; specifically, the clamping assembly 3 includes a cylinder 30 and a circular plate 31, a plurality of circular grooves are arranged on the inner wall of the annular cavity 13 and distributed along the extension section, the circular grooves are provided with the cylinder 30, and the circular plate 31 is arranged in the cylinder 30 by means of a push spring, one side of the circular plate 31 slides through the cylinder 30 and the inner wall of the annular cavity 13 and abuts against the inner diameter of the adjacent annular frame 14.

[0050] That is, the push spring always pushes one side of the circular plate 31 to remain outside the cylinder 30 in the initial state. When the annular frame 14 moves to the position corresponding to the circular plate 31, the circular plate 31 will be pushed in the opposite direction by the annular frame 14, and part of the extension section moves into the cylinder 30. Under the action of the push spring, the circular plate 31 further abuts against the annular frame 14 to achieve limiting, so as to ensure that the annular frame 14 will not slide downward without external force, thereby stably maintaining the current height.

[0051] Continuing to refer to Figure 3 ,Figure 5 、 Figure 6 and Figure 7 As shown, a conducting component 4 for conducting electricity to the transmitting end 16 and the receiving end 15 is further provided inside the drill rod 1; specifically, the conducting component 4 includes a wire 40, a conductive ring plate 41, a cable 42 and a conducting plate 43. A bending groove is provided inside the drill rod 1, and the bending groove is connected to the corresponding circular groove. The adjacent cylinders 30 are connected in series with the wire 40 located in the bending groove, and the wire 40 of the uppermost cylinder 30 extends to the upper end of the drill rod 1 corresponding to the hinge plate 12. The cylinder 30 itself is a conductive medium, and multiple cylinders 30 are connected in series with each other through the wire 40.

[0052] A structural cavity is opened inside the annular frame 14, and a conductive ring plate 41 is installed in the structural cavity, and the circular plate 31 is in contact with the conductive ring plate 41. A cable 42 is provided on the inner wall of the installation cavity 21, and one side of the cable 42 is plugged into the corresponding transmitting end 16 or the receiving end 15, and the other side passes through the inner wall of the installation cavity 21 and is connected to the conductive ring plate 41, that is, the electrical signal can be transmitted to several cylinders 30 through the wire 40, and the cylinder 30 is then transmitted to the corresponding transmitting end 16 or the receiving end 15 through the corresponding circular plate 31, the conductive ring plate 41 and the cable 42, so that the transmitting end 16 and the receiving end 15 can operate, and the cable 42 is made of flexible material, so when the installation frame 23 is driven by the corresponding pull spring 22 to offset the vibration, it will not cause limitation to the movement of the installation frame 23, but will move synchronously with the installation frame 23.

[0053] During the rotation of the annular frame 14 , the conductive ring plate 41 also rotates. However, during the rotation, the circular plate 31 is always in contact with the conductive ring plate 41 and indirectly limits the annular frame 14 through the conductive ring plate 41 .

[0054] A conductive plate 43 is provided inside the hinged plate 12 , and the bottom of the conductive plate 43 is connected to the wire 40 . That is, when the external power supply device is connected to the conductive plate 43 , the electrical signal and the wire 40 will be indirectly transmitted to the transmitting end 16 and the receiving end 15 through the conductive plate 43 .

[0055] Reference Figure 8 and Figure 9 As shown, a contact assembly 5 for enhancing the signal is provided on one side of the transmitting end 16 and the receiving end 15; specifically, the contact assembly 5 includes a telescopic plate 50, a contact arc plate 51, a reset push spring 52 and a passive arc plate 53. The telescopic plate 50 is provided on the side of the transmitting end 16 and the receiving end 15 away from the corresponding mounting cavity 21. The telescopic end of the telescopic plate 50 is provided with a contact arc plate 51, and the contact arc plate 51 corresponds to the inner wall of the annular cavity 13.

[0056] That is, the transmitting end 16 can transmit the electric wave from the stretchable plate 50 to the contact arc plate 51, and similarly, the receiving end 15 can receive the signal through the contact arc plate 51 and the stretchable plate 50.

[0057] The inner wall of the annular cavity 13 is provided with a plurality of reset springs 52 arranged uniformly along the extension section of the annular cavity 13, and the reset springs 52 are in one-to-one correspondence with the mounting cavities 21 and in longitudinal direction with the circular grooves. One side of the reset spring 52 is provided with a passive arc plate 53, and the passive arc plate 53 is in abutment with the adjacent contact arc plate 51.

[0058] That is, when the annular frame 14 moves to the position corresponding to the passive arc plate 53 and the contact arc plate 51 contacts the passive arc plate 53, the stretchable plate 50 and the reset spring 52 are self-adapting and stretchable to ensure that they are tightly attached to each other. When the annular frame 14 rotates, the contact arc plate 51 sequentially contacts and moves to each passive arc plate 53, and the process is repeated. The reset spring 52, the stretchable plate 50 and the pulling spring 22 work together to provide damping and buffering for the mounting frame 23.

[0059] The transmitting end 16 transmits the electric wave to the drill pipe 1 through the stretchable plate 50, the contact arc plate 51, the passive arc plate 53 and the reset spring 52, and the electric wave is then transmitted to the ground by the drill pipe 1 itself, preventing the electric wave from weakening when propagating inside the drill pipe 1. Similarly, when the electric wave is reflected back, it is transmitted to the receiving end 15 by the drill pipe 1, the reset spring 52, the passive arc plate 53, the contact arc plate 51 and the stretchable plate 50.

[0060] Embodiment two: refer to Figure 10 , Figure 11 and Figure 12As shown, on the basis of the first embodiment, in order to drive the two annular frames 14 to rotate in the annular cavity 13, so that the transmitting end 16 and the receiving end 15 can change the angle, and drive the annular frame 14 to move in the up-down direction in the annular cavity 13, so that the distance between the transmitting end 16 and the receiving end 15 can be changed, a driving unit 6 is arranged in the annular cavity 13; Specifically, the driving unit 6 includes a driving frame 60, a reciprocating screw rod 61, a driving gear 62, a structure groove 63, a power gear 64, a containing groove 65, an electric push rod 66, a transmission gear 67, a double-sided gear ring 68 and an inner gear ring 69, the driving frame 60 with a V-shaped cross section is rotationally arranged on the top wall of the annular cavity 13, the reciprocating screw rod 61 is symmetrically threaded between the two annular frames 14, the reciprocating screw rod 61 corresponds to the two mounting cavities 21 without the mounting unit 2, and the screw grooves on the outer side of the reciprocating screw rod 61 are symmetrically distributed, the driving frame 60 can drive the two annular frames 14 to rotate in the annular cavity 13 by the reciprocating screw rod 61 when it is driven by external force, and when the reciprocating screw rod 61 rotates on the driving frame 60, it will drive the two annular frames 14 to move in the up-down direction in the annular cavity 13, because the screw grooves on the outer side of the reciprocating screw rod 61 are symmetrically distributed, when rotating, the two annular frames 14 will move relatively or reversely according to the design of the screw grooves, and the distance between the transmitting end 16 and the receiving end 15 and the angle change are realized by combining the above implementation process.

[0061] The top end of the reciprocating screw rod 61 penetrates through the outer wall of the driving frame 60 located in the V-shaped cross section and is provided with a driving gear 62, the inside of the drill rod 1 is provided with a structure groove 63, the outside of the main shaft 11 is provided with a power gear 64 located in the structure groove 63, the inside of the drill rod 1 is also symmetrically provided with two containing grooves 65, and the containing grooves 65 are respectively communicated with the structure groove 63 and the annular cavity 13, the top of the containing groove 65 is provided with an electric push rod 66 through a cylinder seat, the outer side of the pushing shaft of the electric push rod 66 is rotationally provided with a transmission gear 67 located in the containing groove 65, and the transmission gear 67 is engaged with the power gear 64, a double-sided gear ring 68 is rotationally arranged on the inner bottom wall of the driving frame 60, the outer diameter and the inner diameter of the double-sided gear ring 68 are respectively engaged with the driving gear 62 and the transmission gear 67, that is, the electric push rod 66 can drive the corresponding transmission gear 67 to move in the up-down direction in the containing groove 65, and the transmission gear 67 is always engaged with the power gear 64 during the movement, when the main shaft 11 rotates, the rotation force is transmitted to the double-sided gear ring 68 through the transmission gear 67, the double-sided gear ring 68 can rotate on the driving frame 60, and when rotating, it will drive the driving gear 62 to rotate, the driving gear 62 drives the reciprocating screw rod 61 to rotate, so that the annular frame 14 can move in the up-down direction.

[0062] An elastic limiting device (not shown, known technology) is also provided between the driving frame 60 and the annular cavity 13 to limit the driving frame 60, so that a certain degree of driving force is required to drive the driving frame 60 to rotate in the annular cavity 13, and when the power gear 64 drives the double-sided gear ring 68 and the driving gear 62 to rotate, the driving frame 60 will not rotate; an inner gear ring 69 is also provided on the inner diameter of the top of the driving frame 60, and the inner gear ring 69 corresponds to the transmission gear 67. When the annular frame 14 needs to be rotated to change the transmitting end 16 and the receiving end 16, the inner gear ring 69 is provided with a plurality of gears. When the angle of the end 15 is reached, the corresponding transmission gear 67 is driven to rise by the electric push rod 66, so that the transmission gear 67 is no longer engaged with the drive gear 62, and then engages with the inner ring gear 69. At this time, the power gear 64 can indirectly drive the drive frame 60 to rotate in the annular cavity 13 through the inner ring gear 69, thereby indirectly driving the annular frame 14 to rotate in the annular cavity 13. When the annular frame 14 does not need to rotate or move up and down, the electric push rod 66 pushes the corresponding transmission gear 67 to move between the drive gear 62 and the inner ring gear 69.

[0063] Example 3: Reference Figure 13 、 Figure 14 and Figure 15 As shown, based on the first embodiment, an external extension rod 7 is provided at the upper end of the drill rod 1, and hinge plates 12 are symmetrically provided at the upper and lower ends of the external extension rod 7. A bending groove is also provided inside the external extension rod 7, and a wire 40 is provided in the bending groove. A conductive plate 43 is also installed in the hinge plate 12, and the conductive plate 43 is connected to the wire 40. A pin 70 is commonly inserted between the hinge plate 12 at the bottom of the external extension rod 7 and the hinge plate 12 at the top of the drill rod 1, and the pin 70 is in contact with the conductive plate 43 in the hinge plate 12. A main shaft 11 is also rotatably provided in the external extension rod 7, and the bottom of the main shaft 11 is hinged to the top of the main shaft 11 in the drill rod 1.

[0064] That is, the external extension rod 7 is connected to the drill pipe 1 through the cooperation of the pin shaft 70 and the corresponding hinge plate 12, and the pin shaft 70 is a conductive medium between the two conductive plates 43. Multiple external drill pipes 1 are extended to the wellhead through the above structure, and power supply equipment (existing technology, not shown) is set up at the wellhead. Conductive power is carried out through multiple external extension rods 7, and finally the electrical signal is transmitted to the transmitting end 16 and the receiving end 15, so that the operator can directly control the transmitting end 16 and the receiving end 15 on the ground.

[0065] Working time: first step: the power supply device transmits the electrical signal to the conductive plate 43 in the hinged plate 12 through the conductive plate 43, and then through the wire 40, the pin shaft 70 and the wire 40 in the outer extension rod 7, finally the electrical signal is transmitted to the wire 40 inside the drill rod 1; the wire 40 transmits the electrical signal to the cylinder 30, and then through the circular plate 31 and the conductive ring plate 41 to the cable 42 in the installation cavity 21, and the cable 42 transmits the electrical signal to the transmitting end 16, so that it starts to emit electromagnetic wave towards the drilling direction of the drill bit 10 for detection.

[0066] Second step: the emitted electromagnetic wave reflects after detecting the measured object, which is captured by the receiving end 15. Then, the signal is transmitted to the reset push spring 52 on the inner wall of the annular cavity 13 through the contact arc plate 51 and the telescopic plate 50, and then to the drill rod 1 through the passive arc plate 53, and finally the signal is transmitted to the ground through the drill rod 1 for the operator to analyze.

[0067] Third step: if the measurement angle needs to be adjusted, the electric push rod 66 is started, the transmission gear 67 is engaged with the inner gear ring 69, the power gear 64 drives the drive frame 60 to rotate in the annular cavity 13 through the inner gear ring 69, the rotation of the drive frame 60 further drives the reciprocating wire rod 61 to rotate, which promotes the synchronous rotation of the two annular frames 14 in the annular cavity 13, thereby realizing the angle adjustment of the transmitting end 16 and the receiving end 15.

[0068] Fourth step: if the distance between the transmitting end 16 and the receiving end 15 needs to be adjusted, the electric push rod 66 needs to be started again, the transmission gear 67 is engaged with the drive gear 62, and then through the linkage of the power gear 64, the transmission gear 67 and the drive gear 62, the reciprocating wire rod 61 is driven to rotate, with the rotation of the reciprocating wire rod 61, the two annular frames 14 will move in opposite directions in the annular cavity 13, thereby effectively adjusting the distance between the transmitting end 16 and the receiving end 15.

[0069] Fifth step: during the drilling process of the drill bit 10, the drill rod 1 and the annular frame 14 will vibrate; the pull spring 22 supports the installation frame 23 and buffers part of the vibration force; the extension plate 24 supports the anti-vibration plate 25, which offsets the shaking force of the installation frame 23; the reset push spring 52 works with the telescopic plate 50 to effectively dampen and buffer the installation frame 23, so as to ensure that the transmitting end 16 and the receiving end 15 can operate in a stable and reliable environment.

[0070] Sixth step: the push spring pushes the circular plate 31, so that it is always located outside the cylinder 30; when the annular frame 14 moves to correspond to the circular plate 31, the circular plate 31 is reversely contacted by the annular frame 14, part of the extension section moves back into the cylinder 30, the push spring pushes the circular plate 31 to limit the contact of the annular frame 14, preventing the annular frame 14 from sliding down when not driven by external force.

[0071] The seventh step: the electric signal is transmitted to the cylinder 30 through the wire 40, and then is transmitted to the cable 42 through the circular plate 31 and the conductive ring plate 41, and the cable 42 transmits the electric signal to the transmitting end 16 and the receiving end 15, ensuring the normal operation thereof; during the rotation of the annular frame 14, the conductive ring plate 41 and the circular plate 31 are always in contact, indirectly limiting the annular frame 14, and ensuring the continuity of the conduction.

[0072] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, regardless of what point of view is considered.

[0073] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A small-diameter measurement device for measuring resistivity while drilling, comprising a drill bit (10) mounted at the bottom of a drill pipe (1), a main shaft (11) rotatably arranged in the drill pipe (1) and connected to the drill bit (10) at the bottom, and a hinged plate (12) symmetrically arranged at the upper end of the drill pipe (1), characterized in that: The drill rod (1) is internally provided with an annular cavity (13), and the annular cavity (13) is symmetrically provided with an annular frame (14) with a U-shaped section which slides in the annular cavity (13), and the corresponding annular frames (14) are respectively provided with a receiving end (15) and a transmitting end (16) in the annular cavity (13), and the annular frame (14) is provided with a mounting unit (2) for limiting the transmitting end (16) and the receiving end (15). The mounting unit (2) comprises a plurality of partition plates (20) which are uniformly arranged on the inner wall of the annular frame (14) along the axis of the annular frame (14), the space between the adjacent two partition plates (20) forms a mounting cavity (21), and the upper and lower inner walls of the mounting cavity (21) are provided with pulling springs (22), and the corresponding pulling springs (22) are provided with a mounting frame (23) between them. The inner wall of the annular cavity (13) is further provided with a clamping assembly (3) for clamping and limiting the annular frame (14), which comprises a plurality of circular grooves arranged on the inner wall of the annular cavity (13) and distributed along the extension section thereof, a cylindrical barrel (30) is arranged in the circular groove, and a circular plate (31) is arranged in the cylindrical barrel (30) by means of a push spring. The drill rod (1) is further provided with a conduction assembly (4) for conducting electricity to the transmitting end (16) and the receiving end (15), which comprises a bending groove arranged in the drill rod (1), and the bending groove is in communication with the corresponding circular groove, the adjacent cylindrical barrels (30) are jointly connected by a wire (40) located in the bending groove, and the wire (40) of the uppermost cylindrical barrel (30) extends to the upper end of the drill rod (1) and corresponds to the hinge plate (12). The annular frame (14) is internally provided with a structure cavity, and a conductive ring plate (41) is arranged in the structure cavity, and the circular plate (31) is in contact with the conductive ring plate (41), a cable (42) is arranged on the inner side wall of the mounting cavity (21), one side of the cable (42) is inserted into the corresponding transmitting end (16) or receiving end (15), and the other side of the cable (42) penetrates through the inner side wall of the mounting cavity (21) and is connected with the conductive ring plate (41). The transmitting end (16) and the receiving end (15) are provided with a contact assembly (5) for enhancing the signal on one side, which comprises a telescopic plate (50) arranged on the side of the transmitting end (16) and the receiving end (15) away from the corresponding mounting cavity (21), and a contact arc plate (51) is arranged on the telescopic end of the telescopic plate (50), and the contact arc plate (51) corresponds to the inner wall of the annular cavity (13).

2. The apparatus of claim 1, wherein: The mounting frames (23) on the upper and lower annular frames (14) are respectively provided with the receiving end (15) and the transmitting end (16) by means of detachable manner, and the mounting frames (23) are further provided with extension plates (24) on both sides, and one end of the extension plate (24) is provided with an anti-vibration plate (25).

3. The apparatus of claim 1, wherein: One side of the circular plate (31) slides through the cylindrical barrel (30) and the inner wall of the annular cavity (13) and abuts against the inner diameter of the adjacent annular frame (14).

4. The apparatus of claim 1, wherein: The hinge plate (12) is provided with a conductive plate (43), and the bottom of the conductive plate (43) is connected with the wire (40).

5. The apparatus of claim 1, wherein: The annular cavity (13) is provided with a plurality of reset springs (52) arranged uniformly along the extension of the annular cavity (13) and distributed annularly on the inner wall of the annular cavity (13), and the annularly distributed reset springs (52) correspond to the installation cavities (21) one by one, and the longitudinal direction of the reset springs (52) corresponds to the circular groove.

6. The apparatus of claim 5, wherein: One side of the reset spring (52) is provided with a passive arc plate (53), and the passive arc plate (53) is in abutment with the adjacent contact arc plate (51).

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