A drill string that can measure bottom hole drilling parameters

Abstract

The present application relates to a kind of drill tools that can measure hole bottom drilling parameter, including drill bit and drill pipe, the both ends of drill pipe are connected drill bit and drilling machine respectively, further include: sleeve, sleeve is located in drill bit, and annular accommodating cavity is formed between the inner peripheral wall of sleeve and drill bit.Measuring assembly is located in accommodating cavity, measuring assembly includes weight-on-bit measuring bridge, torque measuring bridge and signal transmission unit.Weight-on-bit measuring bridge can collect the weight-on-bit of drill bit and transmit weight-on-bit information to signal transmission unit, torque measuring bridge can collect the torque of drill bit and transmit torque information to signal transmission unit, signal transmission unit can transmit weight-on-bit information and torque information to drilling machine.Its beneficial effect is that, in the drilling process of drill bit, drilling machine can adjust the weight-on-bit and torque applied to drill bit through drill pipe in real time according to demand, improve the adjustment accuracy of weight-on-bit and torque on drill bit, avoid the breakage of drill pipe and other hole accidents.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geological exploration, and particularly relates to a drill tool capable of measuring hole bottom drilling parameters. BACKGROUND

[0002] The drill tool is a drilling device, which comprises a drill rod and a drill bit, etc. The driving end of a drilling machine is connected with the drill bit through the drill rod. When the drilling pressure and the torque applied on the drill rod by the drilling machine are constant, the drilling pressure and the torque transmitted to the drill bit by the drill rod gradually decrease with the increase of the drilling depth of the drill bit, thereby reducing the drilling efficiency. If the drilling pressure and the torque applied on the drill rod by the drilling machine are continuously increased with the increase of the drilling depth, the drill rod is prone to breakage and other in-hole accidents.

[0003] In the prior art, only the values of the drilling pressure and the torque applied on the drill rod by the drilling machine can be obtained, and the drilling pressure and the torque borne by the drill bit cannot be collected in real time. The drilling pressure and the torque applied on the drill bit are adjusted according to experience for long-distance drilling. However, the accuracy of the adjustment mode of the drilling pressure and the torque is low, which is prone to misjudgment and causes in-hole accidents such as drill rod breakage, thereby prolonging the construction period and increasing the construction cost. SUMMARY

[0004] (I) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present application provides a drill tool capable of measuring hole bottom drilling parameters, which solves the technical problems that only the values of the drilling pressure and the torque applied on the drill rod by the drilling machine can be obtained in the prior art, the drilling pressure and the torque applied on the drill bit are adjusted according to experience, the accuracy of the adjustment mode of the drilling pressure and the torque is low, in-hole accidents such as drill rod breakage are caused, the construction period is prolonged, and the construction cost is increased.

[0006] (II) Technical solutions

[0007] In order to achieve the above-mentioned purposes, the main technical solutions adopted by the present application include:

[0008] The present application provides a drill tool capable of measuring hole bottom drilling parameters, which comprises a drill bit and a drill rod, the two ends of the drill rod are connected with the drill bit and the drilling machine respectively, and further comprises:

[0009] A sleeve is located in the drill bit, and an annular accommodating cavity is formed between the sleeve and the inner peripheral wall of the drill bit.

[0010] A measuring assembly is located in the accommodating cavity, and the measuring assembly comprises a drilling pressure measuring bridge, a torque measuring bridge and a signal transmission unit.

[0011] The drill pressure measuring bridge circuit can collect the drill pressure of the drill bit and transmit the drill pressure information to the signal transmission unit, the torque measuring bridge circuit can collect the torque of the drill bit and transmit the torque information to the signal transmission unit, and the signal transmission unit can transmit the drill pressure information and the torque information to the drilling rig.

[0012] According to the present application, the drill pressure measuring bridge circuit comprises a first strain gauge and a second strain gauge, the extension direction of the first strain gauge is parallel to the axial direction of the drill bit, and the extension direction of the second strain gauge is perpendicular to the axial direction of the drill bit.

[0013] The torque measuring bridge circuit comprises a third strain gauge, and the angle between the extension direction of the third strain gauge and the axial direction of the drill bit is 45°.

[0014] According to the present application, the number of the first strain gauges, the second strain gauges and the third strain gauges is multiple.

[0015] The multiple first strain gauges, the multiple second strain gauges and the multiple third strain gauges are equidistantly arranged along the circumferential direction of the accommodating cavity.

[0016] According to the present application, the signal transmission unit comprises a sensor circuit module.

[0017] The sensor circuit module comprises a signal conditioning circuit, a single-chip microcomputer integrated circuit, a secondary conversion circuit and a data storage chip.

[0018] The signal conditioning circuit can receive and amplify the drill pressure information transmitted by the drill pressure measuring bridge circuit and the torque information transmitted by the torque measuring bridge circuit, and transmit the amplified drill pressure information and torque information to the single-chip microcomputer integrated circuit for signal processing, the single-chip microcomputer integrated circuit transmits the drill pressure information and torque information after signal processing to the secondary conversion circuit for signal conversion, and the secondary conversion circuit transmits the drill pressure information and torque information after signal conversion to the data storage chip for storage.

[0019] The signal transmission unit further comprises a master control transmission module.

[0020] The secondary conversion circuit can also transmit the drill pressure information and torque information after signal conversion to the drilling rig through the master control transmission module.

[0021] According to the present application, further comprising:

[0022] The inner tube assembly comprises an inner tube assembly body, a coring tube and a spear head.

[0023] The inner tube assembly body is provided with the coring tube near one end of the drill bit, the coring tube is inserted in the sleeve, and the coring tube can store a core;

[0024] The inner tube assembly body is provided with the spear head far away from the drill bit, and the spear head can drive the whole inner tube assembly to move along the axial direction of the spear head to fish the whole inner tube assembly.

[0025] According to the present application, the sleeve is a cylinder, the first end of the sleeve abuts against the inner side of the drilling end of the drill bit, and the second end of the sleeve is flush with the connecting end of the drill bit;

[0026] The drill tool capable of measuring the bottom hole drilling parameter further comprises:

[0027] The reamer is provided with a stepped structure at the first end, and the end face of the stepped structure abuts against the second end of the sleeve and the connecting end of the drill bit;

[0028] The outer tube abuts against the second end of the reamer at the first end;

[0029] The elastic clamping chamber abuts against the second end of the outer tube at the first end;

[0030] The first end of the coupling is connected with the first end of the elastic clamping chamber;

[0031] The sleeve, the reamer, the outer tube, the elastic clamping chamber and the coupling are sequentially communicated and form an inner tube assembly accommodating cavity accommodating the inner tube assembly, and the inner tube assembly can move along the axial direction of the inner tube assembly.

[0032] According to the present application, the master control transmission module transmits the WOB information and the torque information to the drilling rig through wires; the sleeve, the reamer, the outer tube, the elastic clamping chamber and the coupling are all provided with wire holes extending along the respective axial directions, and the wire holes are used for penetrating the wires between the master control transmission module and the drilling rig;

[0033] Alternatively, the master control transmission module transmits the WOB information and the torque information to the drilling rig through a wireless transmission mode;

[0034] Alternatively, the inner tube assembly body is provided with a data storage module, the data storage module can receive and store the WOB information and the torque information converted from the signals transmitted by the master control transmission module, and the WOB information and the torque information can be read by the data storage module when the inner tube assembly body is fished by the spear head.

[0035] According to the present application, a stabilizing ring is further included;

[0036] The stabilizing ring is located in a stabilizing ring accommodating cavity formed by the second end of the sleeve, the inner peripheral wall of the reamer, and the first end of the outer tube, and the stabilizing ring is sleeved on the outer periphery of the coring tube; the inner peripheral wall of the stabilizing ring is provided with a groove body extending in the axial direction of the stabilizing ring.

[0037] According to the present application, the inner peripheral wall of the second end of the outer tube is provided with an annular groove;

[0038] The drill tool capable of measuring borehole bottom drilling parameters further comprises:

[0039] A centralizing ring is located in a centralizing ring accommodating cavity formed by the annular groove and the first end of the snap chamber.

[0040] According to the present application, the drill rod is a hollow pipe body, and the first end of the drill rod is connected to the second end of the coupling.

[0041] According to the present application, the drill bit is a diamond-impregnated drill bit.

[0042] (Three) beneficial effects

[0043] The present application has the beneficial effect that the drill tool capable of measuring borehole bottom drilling parameters sets the sleeve in the drill bit, and forms an annular accommodating cavity between the sleeve and the inner peripheral wall of the drill bit. The measuring assembly is arranged in the accommodating cavity, and the measuring assembly comprises a weight-on-bit measuring bridge, a torque measuring bridge, and a signal transmission unit.

[0044] During the drilling process of the drill bit, the weight-on-bit measuring bridge can collect the weight-on-bit borne by the drill bit in real time, the torque measuring bridge can collect the torque borne by the drill bit in real time, the weight-on-bit information is transmitted to the signal transmission unit by the weight-on-bit measuring bridge, the torque information is transmitted to the signal transmission unit by the torque measuring bridge, and the weight-on-bit information and the torque information are transmitted to the drilling rig by the signal transmission unit, so that the drilling rig can adjust the weight-on-bit and the torque applied to the drill bit in real time through the drill rod according to the demand, the adjustment accuracy of the weight-on-bit and the torque on the drill bit is improved, and borehole accidents such as breakage of the drill rod are avoided. At the same time, the measuring assembly is integrated on the drill bit by the sleeve, which is convenient for machining and disassembling, and the cost is relatively low. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a sectional view of the drill tool capable of measuring borehole bottom drilling parameters of the present application;

[0046] Figure 2 is an assembled sectional view of the drill bit, the sleeve, and the measuring assembly;

[0047] Figure 3 is Figure 2 is a schematic view of A-A in

[0048] Figure 4 is a schematic view of a drill bit.

[0049]

Explanation of Reference Signs

[0050] 1: drill bit; 11: core hole; 12: water outlet groove; 13: thread;

[0051] 3: sleeve;

[0052] 4: sealing ring;

[0053] 5: measurement assembly; 511: weight-on-bit measurement bridge; 5111: first strain gauge; 5112: second strain gauge; 512: torque measurement bridge; 5121: third strain gauge; 52: signal transmission unit; 521: sensor circuit module; 522: master control transmission module; 53: wire; 54: power supply;

[0054] 6: inner pipe assembly; 60: inner pipe assembly body; 61: data storage module; 62: core barrel head; 63: coring pipe;

[0055] 71: reamer; 72: outer pipe; 73: stabilizing ring; 74: snap chamber; 75: centralizing ring; 76: coupling. DETAILED DESCRIPTION

[0056] In order to better explain the present application, so as to be understood, the present application is described in detail below by specific embodiments, in combination with the accompanying drawings. In this article, the orientation of "left", "right" and the like is referred to the orientation of the drawings. Figure 1

[0057] Referring to Figures 1-4 , the present application provides a drill tool capable of measuring borehole bottom drilling parameters, including weight-on-bit and torque. The drill tool capable of measuring borehole bottom drilling parameters includes a drill bit 1, a drill pipe, a sleeve 3 and a measurement assembly 5.

[0058] Two ends of the drill pipe are connected to the drill bit 1 and a drilling machine respectively. The drilling machine applies weight-on-bit and torque to the drill bit 1 through the drill pipe to drive the drill bit 1 to drill. The sleeve 3 is located in the drill bit 1, and an annular accommodating cavity is formed between the sleeve 3 and the inner peripheral wall of the drill bit 1. The measurement assembly 5 is located in the accommodating cavity, and the measurement assembly 5 includes a weight-on-bit measurement bridge 511, a torque measurement bridge 512 and a signal transmission unit 52. The weight-on-bit measurement bridge 511 can collect the weight-on-bit of the drill bit 1 and transmit the weight-on-bit information to the signal transmission unit 52, the torque measurement bridge 512 can collect the torque of the drill bit 1 and transmit the torque information to the signal transmission unit 52, and the signal transmission unit 52 can transmit the weight-on-bit information and the torque information to the drilling machine.

[0059] ​During the drilling process of the drill bit 1, the weight-on-bit measuring bridge 511 can collect the weight-on-bit borne by the drill bit 1 in real time, and the torque measuring bridge 512 can collect the torque borne by the drill bit 1 in real time. Then, the weight-on-bit measuring bridge 511 transmits the weight-on-bit information to the signal transmission unit, the torque measuring bridge 512 transmits the torque information to the signal transmission unit 52, and the signal transmission unit 52 transmits the weight-on-bit information and the torque information to the drilling rig, so that the drilling rig can adjust the weight-on-bit and the torque applied to the drill bit 1 through the drill pipe in real time according to the needs, improve the adjustment accuracy of the weight-on-bit and the torque on the drill bit 1, avoid the breakage of the drill pipe and other downhole accidents, and be suitable for long-distance drilling of drilling tools. At the same time, the sleeve 3 integrates the measuring assembly 5 on the drill bit 1, which is convenient for machining and disassembly, and has low cost.

[0060] Specifically, the weight-on-bit measuring bridge 511 includes a first strain gauge 5111 and a second strain gauge 5112.

[0061] The extension direction of the first strain gauge 5111 is parallel to the axial direction of the drill bit 1. The extension direction of the second strain gauge 5112 is perpendicular to the axial direction of the drill bit 1. The weight-on-bit borne by the drill bit 1 is collected by the first strain gauge 5111 and the second strain gauge 5112, and the direction of the weight-on-bit is consistent with the axial direction of the drill bit 1. When the drill bit 1 bears the weight-on-bit, the first strain gauge 5111 and the second strain gauge 5112 will both deform, and the electrical signals containing the weight-on-bit information generated by the deformation of the first strain gauge 5111 and the second strain gauge 5112 are both transmitted to the signal transmission unit 52.

[0062] Preferably, the number of the first strain gauge 5111 and the second strain gauge 5112 is multiple. The multiple first strain gauges 5111 and the multiple second strain gauges 5112 are equidistantly arranged along the circumference of the accommodating cavity, and the weight-on-bit information collected by the multiple first strain gauges 5111 and the multiple second strain gauges 5112 is respectively calculated to offset the influence of temperature, bending moment and other interference factors, thereby improving the measurement accuracy of the weight-on-bit information.

[0063] More preferably, the number of the first strain gauge 5111 and the second strain gauge 5112 is even, so that when calculating the value of the weight-on-bit information, the two first strain gauges 5111 arranged oppositely and the two second strain gauges 5112 arranged oppositely can offset the influence of temperature, bending moment and other interference factors, thereby improving the measurement accuracy of the weight-on-bit information. For easy installation, the number of the first strain gauge 5111 and the second strain gauge 5112 is four.

[0064] Specifically, the torque measuring bridge 512 includes a third strain gauge 5121.

[0065] The angle between the extension direction of the third strain gauge 5121 and the axial direction of the drill bit 1 is 45°. The third strain gauge 5121 collects the torque borne by the drill bit 1. When the drill bit 1 bears the torque, the third strain gauge 5121 can be deformed and can transmit the electrical signal containing the torque information generated by the deformation to the signal transmission unit 52.

[0066] Preferably, the number of the third strain gauges 5121 is multiple. The multiple third strain gauges 5121 are equidistantly arranged along the circumferential direction of the accommodating cavity. The torque information collected by the multiple third strain gauges 5121 is calculated to offset the influence of the interference factors such as temperature and bending moment, so as to improve the measurement accuracy of the torque information.

[0067] More preferably, the number of the third strain gauges 5121 is even, so that when the value of the torque information is calculated, the two third strain gauges 5121 arranged oppositely can offset the influence of the interference factors such as temperature and bending moment, so as to improve the measurement accuracy of the torque information. For the convenience of installation, the number of the third strain gauges 5121 is four.

[0068] Further, the first strain gauge 5111, the second strain gauge 5112 and the third strain gauge 5121 are arranged along the axial direction of the accommodating cavity.

[0069] Further, the first strain gauge 5111, the second strain gauge 5112 and the third strain gauge 5121 are pasted on the inner circumferential wall of the drill bit 1.

[0070] Further, the signal transmission unit 52 comprises a sensor circuit module 521 and a main control transmission module 522.

[0071] The sensor circuit module 521 comprises a signal conditioning circuit, a single-chip microcomputer integrated circuit, a secondary conversion circuit and a data storage chip. The signal conditioning circuit can receive and amplify the WOB information transmitted by the WOB measurement bridge 511 and the torque information transmitted by the torque measurement bridge 512, and transmit the amplified WOB information and torque information to the single-chip microcomputer integrated circuit for signal processing. The single-chip microcomputer integrated circuit transmits the WOB information and torque information after signal processing to the secondary conversion circuit for signal conversion. The secondary conversion circuit transmits the WOB information and torque information after signal conversion to the data storage chip for storage. The secondary conversion circuit can transmit the WOB information and torque information after signal conversion to the drilling rig through the main control transmission module 522, so that the drilling rig can know the WOB and torque at the drill bit 1.

[0072] Further, the WOB measurement bridge 511 and the torque measurement bridge 512 are connected to the sensor circuit module 521 through the wires 53, and the sensor circuit module 521 is connected to the main control transmission module 522 through the wires 53.

[0073] Further, the measuring assembly 5 further comprises a power supply 54. The power supply 54 is connected to the first strain gauge 5111, the second strain gauge 5112, the third strain gauge 5121, the sensor circuit module 521 and the master transmission module 522 through wires 53 to supply power to the above-mentioned components.

[0074] Further, the sleeve 3 is a cylinder. The axial section of the sleeve 3 is symmetrically two L-shaped. The first end of the sleeve 3 abuts against the inner side of the drilling end of the drill bit 1, and the second end of the sleeve 3 is flush with the connecting end of the drill bit 1. The first end of the sleeve 3 and the drilling end of the drill bit 1, and the second end of the sleeve 3 and the connecting end of the drill bit 1 are both provided with sealing rings 4 for sealing the connection between the sleeve 3 and the drill bit 1 to ensure the sealing of the annular accommodating cavity formed between the inner circumferential walls of the sleeve 3 and the drill bit 1.

[0075] Further, the drill capable of measuring the drilling parameters at the bottom of the hole further comprises an inner pipe assembly 6.

[0076] The inner pipe assembly 6 comprises an inner pipe assembly body 60 and a coring pipe 63. The coring pipe 63 is arranged at one end of the inner pipe assembly body 60 close to the drill bit 1 and is inserted into the sleeve 3, and the coring pipe 63 is used for storing the core of the rock. The fish spear head 62 is arranged at one end of the inner pipe assembly body 60 away from the drill bit 1, and the fish spear head 62 can drive the whole inner pipe assembly 6 to move along the axial direction of the fish spear head 62 to fish the whole inner pipe assembly 6.

[0077] When the drill capable of measuring the drilling parameters at the bottom of the hole drills the stratum, the rock and soil enters the coring pipe 63 from the drill bit 1, and the coring pipe 63 stores the core of the rock and soil.

[0078] Specifically, the data storage module 61 is arranged on the inner pipe assembly body 60. The data storage module 61 can receive and store the converted weight-on-bit information and torque information transmitted by the master transmission module 522, and the data storage module 61 can also allow the staff to read the weight-on-bit information and torque information of the drill bit 1.

[0079] Further, the drill capable of measuring the drilling parameters at the bottom of the hole further comprises a reamer 71, an outer pipe 72, a snap chamber 74 and a shaft coupling 76.

[0080] The first end of the reamer 71 is provided with a stepped structure, and the end face of the stepped structure abuts against the second end of the sleeve 3 and the connecting end of the drill bit 1 to axially position the sleeve 3 and ensure the sealing of the annular accommodating cavity formed between the inner circumferential walls of the sleeve 3 and the drill bit 1. The first end of the outer pipe 72 abuts against the second end of the reamer 71. The second end of the outer pipe 72 abuts against the first end of the snap chamber 74. The second end of the snap chamber 74 is connected to the first end of the shaft coupling 76. The second end of the shaft coupling 76 is connected to the first end of the drill pipe.

[0081] The sleeve 3, the reamer 71, the outer tube 72, the snap chamber 74 and the coupling 76 are sequentially communicated and form an inner tube assembly accommodating cavity for accommodating the inner tube assembly 6, and the inner tube assembly 6 is arranged in the inner tube assembly accommodating cavity and can move along the axial direction of the inner tube assembly.

[0082] The spear head 62 can drive the inner tube assembly 6 to move along the axial direction of the inner tube assembly and to be separated from the inner tube assembly accommodating cavity, and after the core stored in the coring tube 63 is taken out, the inner tube assembly 6 is sent into the inner tube assembly accommodating cavity again to fish the inner tube assembly 6 as a whole. When the inner tube assembly 6 is fished as a whole by the spear head 62, the drilling pressure information and the torque information can be read by the data storage module 61.

[0083] Further, the drilling tool for measuring the hole bottom drilling parameter further comprises a stabilizing ring 73.

[0084] The stabilizing ring 73 is arranged in a stabilizing ring accommodating cavity formed by the second end of the sleeve 3, the inner circumferential wall of the reamer 71 and the first end of the outer tube 72, and the stabilizing ring accommodating cavity is used for axially positioning the stabilizing ring 73. The stabilizing ring 73 is sleeved on the outer circumferential wall of the coring tube 63, and the stabilizing ring 73 is used for limiting the radial position of the coring tube 63. The inner circumferential wall of the stabilizing ring 73 is provided with a groove body extending along the axial direction of the stabilizing ring 73, and the groove body is used for flowing the drilling fluid. The inner circumferential wall of the second end of the outer tube 72 is provided with an annular groove.

[0085] Further, the drilling tool for measuring the hole bottom drilling parameter further comprises a stabilizing ring 73.

[0086] The stabilizing ring 75 is arranged in a stabilizing ring accommodating cavity formed by the annular groove of the outer tube 72 and the first end of the snap chamber 74, and the stabilizing ring accommodating cavity is used for axially positioning the stabilizing ring 75. The stabilizing ring 75 is sleeved on the outer circumferential wall of the inner tube assembly main body 60 of the inner tube assembly 6, and the stabilizing ring 75 cooperates with the tapered surface structure on the outer circumferential wall of the inner tube assembly main body 60 to limit the position of the inner tube assembly 6 moving along the axial direction of the inner tube assembly to the left. Under the limitation of the left and right movement positions of the inner tube assembly 6 by the snap chamber 74 and the stabilizing ring 75, the axial movement of the inner tube assembly 6 can be avoided.

[0087] Specifically, the first end of the outer tube 72 is provided with a stepped structure, the end face of the stepped structure abuts against the second end of the reamer 71, and the side wall of the stepped structure is threadedly connected with the inner circumferential wall of the second end of the reamer 71. The first end of the snap chamber 74 is provided with a stepped structure, the end face of the stepped structure abuts against the second end of the outer tube 72, and the side wall of the stepped structure is threadedly connected with the inner circumferential wall of the second end of the outer tube 72. The first end of the coupling 76 is provided with a stepped structure, the end face of the stepped structure abuts against the second end of the snap chamber 74, and the side wall of the stepped structure is threadedly connected with the inner circumferential wall of the second end of the snap chamber 74.

[0088] Further, the main control transmitting module 522 transmits the drilling pressure information and the torque information to the drilling rig in the following two types:

[0089] The first type: the main control transmitting module 522 transmits the drilling pressure information and the torque information to the drilling rig through the wire 53. The sleeve 3, the reamer 71, the outer tube 72, the elastic clamping chamber 74 and the coupling 76 are all provided with wire holes extending along the respective axial directions, which are used to pass the wire 53 between the main control transmitting module 522 and the drilling rig.

[0090] The second type: the main control transmitting module 522 transmits the drilling pressure information and the torque information to the drilling rig through wireless transmission modes such as electromagnetic waves and mud pulses.

[0091] Further, the drill rod is a hollow pipe body. The first end of the drill rod is connected to the second end of the coupling 76.

[0092] Further, the drill bit 1 is a diamond impregnated drill bit, which is provided with multiple layers of diamonds along the axial direction of the drill bit. After the end face of the drilling end of the drill bit 1 is worn, the diamonds inside the drill bit 1 can continue to drill, thereby prolonging the service life of the drill bit 1.

[0093] Specifically, the center of the drill bit 1 is provided with a core hole 11, which communicates with the core tube 63. When the drill bit 1 drills, the rock and soil can enter the core tube 63 through the core hole 11.

[0094] The lip face of the drilling end of the drill bit 1 is in the shape of a wide horse's hoof, and a plurality of water outlet groove groups are arranged thereon. The plurality of water outlet groove groups are arranged at intervals along the circumferential direction of the drill bit 1. Each water outlet groove group includes a plurality of water outlet grooves 12 arranged at intervals along the radial direction of the drill bit 1. The water outlet grooves 12 arranged in this way are beneficial to slag discharge. When drilling, the drilling fluid can flow through the gaps between the inner tube assembly 6 and the coupling 76, the inner tube assembly 6 and the elastic clamping chamber 74, the inner tube assembly 6 and the centralizing ring 75, the inner tube assembly 6 and the outer tube 72, the groove on the stabilizing ring 73, the inner tube assembly 6 and the sleeve 3, the core hole 11 on the drill bit 1 and the water outlet grooves 12 in sequence and then discharged.

[0095] The groove on the stabilizing ring 73, the core hole 11 and the water outlet grooves 12 are discharged in the rear.

[0096] The circumferential direction of the connecting end of the drill bit 1 is provided with threads 13, and the side wall of the stepped structure of the reamer 71 is threadedly connected to the connecting end of the drill bit 1.

[0097] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0098] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can modify, modify, replace and modify the above-described embodiments within the scope of the present application.

Claims

1. A drilling tool for measuring bottom hole drilling parameters, comprising a drill bit (1) and a drill rod, wherein the two ends of the drill rod are respectively connected to the drill bit (1) and a drilling rig, characterized in that, Also includes: A sleeve (3) is located inside the drill bit (1), and an annular receiving cavity is formed between the sleeve (3) and the inner peripheral wall of the drill bit (1); the drill bit (1) is a cylindrical body, the first end of the sleeve (3) abuts against the inner side of the drilling end of the drill bit (1), and the second end of the sleeve (3) is flush with the connecting end of the drill bit (1); The measuring component (5) is located within the receiving cavity. The measuring component (5) includes a drill pressure measuring bridge circuit (511), a torque measuring bridge circuit (512), and a signal transmission unit (52). The drill pressure measuring bridge circuit (511) can collect the drill pressure of the drill bit (1) and transmit the drill pressure information to the signal transmission unit (52). The torque measuring bridge circuit (512) can collect the torque of the drill bit (1) and transmit the torque information to the signal transmission unit (52). The signal transmission unit (52) can transmit the drill pressure information and the torque information to the drilling rig. The inner tube assembly (6) includes an inner tube assembly body (60), a core-taking tube (63), and a retrieval spearhead (62). The inner tube assembly body (60) is provided with the core tube (63) at one end near the drill bit (1). The core tube (63) is inserted into the sleeve (3) and can store rock core. The inner tube assembly body (60) is provided with a retrieval spearhead (62) at the end away from the drill bit (1). The retrieval spearhead (62) can drive the inner tube assembly (6) to move along its own axis to retrieve the inner tube assembly (6) as a whole. The hole expander (71) has a stepped structure at its first end, and the end face of the stepped structure abuts against the second end of the sleeve (3) and the connecting end of the drill bit (1). The outer tube (72) has its first end abutting against the second end of the expander (71); The first end of the spring-loaded chamber (74) abuts against the second end of the outer tube (72); A coupling (76) is provided, the first end of which is connected to the first end of the spring-loaded chamber (74); The sleeve (3), the expander (71), the outer tube (72), the spring clip chamber (74) and the coupling (76) are connected in sequence to form an inner tube assembly receiving cavity for accommodating the inner tube assembly (6). The inner tube assembly (6) is disposed in the inner tube assembly receiving cavity and is movable along its own axial direction.

2. The drilling tool for measuring bottom hole drilling parameters as described in claim 1, characterized in that, The drill pressure measurement bridge (511) includes a first strain gauge (5111) and a second strain gauge (5112). The extension direction of the first strain gauge (5111) is parallel to the axial direction of the drill bit (1), and the extension direction of the second strain gauge (5112) is perpendicular to the axial direction of the drill bit (1). The torque measurement bridge circuit (512) includes a third strain gauge (5121), and the angle between the extension direction of the third strain gauge (5121) and the axial direction of the drill bit (1) is 45°.

3. The drilling tool for measuring bottom hole drilling parameters as described in claim 2, characterized in that, The number of the first strain gauge (5111), the second strain gauge (5112), and the third strain gauge (5121) are all multiple; Multiple first strain gauges (5111), multiple second strain gauges (5112), and multiple third strain gauges (5121) are all equidistantly spaced along the circumference of the receiving cavity.

4. The drilling tool for measuring bottom hole drilling parameters as described in claim 1, characterized in that, The signal transmission unit (52) includes a sensor circuit module (521); The sensor circuit module (521) includes a signal conditioning circuit, a microcontroller integrated circuit, a secondary conversion circuit, and a data storage chip; The signal conditioning circuit can receive and amplify the drilling pressure information transmitted by the drilling pressure measurement bridge circuit (511) and the torque information transmitted by the torque measurement bridge circuit (512), and transmit the amplified drilling pressure information and the torque information to the microcontroller integrated circuit for signal processing. The microcontroller integrated circuit transmits the processed drilling pressure information and the torque information to the secondary conversion circuit for signal conversion. The secondary conversion circuit transmits the converted drilling pressure information and the torque information to the data storage chip for storage. The signal transmission unit (52) also includes a main control transmission module (522); The secondary conversion circuit can also transmit the converted drilling pressure information and torque information to the drilling rig via the main control transmitter module (522).

5. The drilling tool for measuring bottom hole drilling parameters as described in claim 1, characterized in that, The main control transmitter module (522) transmits the drilling pressure information and the torque information to the drilling rig via a wire (53); the sleeve (3), the reamer (71), the outer tube (72), the spring clip chamber (74), and the coupling (76) are all provided with wire holes extending along their respective axes, and the wire holes are used to pass through the wire (53) between the main control transmitter module (522) and the drilling rig. Alternatively, the main control transmitter module (522) transmits the drilling pressure information and the torque information to the drilling rig via wireless transmission. Alternatively, a data storage module (61) may be provided on the inner tube assembly body (60). The data storage module (61) may receive and store the drilling pressure information and torque information after the signal is converted by the main control transmitter module (522). When the inner tube assembly (6) is retrieved as a whole by the retrieval spearhead (62), the data storage module (61) may read the drilling pressure information and torque information.

6. The drilling tool for measuring bottom hole drilling parameters as described in claim 1, characterized in that, It also includes a stabilizing ring (73); The stabilizing ring (73) is located in the stabilizing ring receiving cavity formed by the second end of the sleeve (3), the inner peripheral wall of the expander (71) and the first end of the outer tube (72). The stabilizing ring (73) is sleeved on the outer periphery of the core tube (63). The inner peripheral wall of the stabilizing ring (73) is provided with a groove, which extends along the axial direction of the stabilizing ring (73).

7. The drilling tool for measuring bottom hole drilling parameters as described in claim 1, characterized in that, The inner circumferential wall of the second end of the outer tube (72) is provided with an annular groove; The drilling tool capable of measuring bottom hole drilling parameters also includes: The straightening ring (75) is located in the straightening ring receiving cavity formed by the first end of the annular groove and the spring clip chamber (74).

8. The drilling tool for measuring bottom hole drilling parameters as described in claim 6, characterized in that, The drill rod is a hollow tube, and the first end of the drill rod is connected to the second end of the coupling (76).

9. The drilling tool for measuring bottom hole drilling parameters as described in claim 1, characterized in that, The drill bit (1) is an impregnated diamond drill bit.

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