Real-time measurement-while-drilling positioning borehole system and method

Abstract

The application discloses a real-time measurement while drilling positioning drilling system and method. The real-time measurement while drilling positioning drilling system comprises a guide drilling machine, a measurement support, a double-wall drill rod connected with the guide drilling machine, a guide shaft fixedly connected with one end of the double-wall drill rod away from the guide drilling machine and a drill bit connected with the guide shaft. The guide drilling machine is provided with a first power head and a second power head. The measurement support is provided with a camera positioning device. The double-wall drill rod comprises an inner drill rod and an outer drill rod which are movably connected and concentrically arranged; the inner drill rod is used as an optical measurement channel; and the annular space between the inner drill rod and the outer drill rod is used as an annular fluid channel. The guide shaft comprises a guide outer cylinder, a connecting inner cylinder and a transmission shaft. The connecting inner cylinder is provided with a first target; and the camera positioning device is used for shooting the image of the first target. The real-time measurement while drilling positioning drilling system and method can monitor the inclination of a guide hole in real time during drilling and correct deviation, so that the inclination deviation of the drilled hole is not greater than 0.5%.

Description

Technical Field

[0001] This specification relates to the field of drilling technology, and in particular to a real-time measurement and positioning drilling system and method. Background Technology

[0002] Anchor holes are drilled for installing anchor bolts or cables during anchoring projects on bridges, unstable rocks, and building components. During the drilling process, due to the inclined drilling angle and harsh working environment, the accuracy of the drilled anchor holes is often low, especially the inclination deviation, which cannot be controlled within a small range. Furthermore, the drilling equipment used for anchor holes requires a considerable amount of time for positioning before use, which slows down the construction progress. Summary of the Invention

[0003] In view of the shortcomings of the prior art, one of the objectives of this specification is to provide a real-time measurement and positioning drilling system and method that can monitor and correct the inclination of the pilot hole in real time during drilling, so that the inclination deviation of the drilled hole is no more than 0.5%.

[0004] To achieve the above objectives, this specification provides a real-time measurement-while-drilling positioning borehole system, comprising:

[0005] A directional drilling machine for drilling directional holes, the directional drilling machine being equipped with a first power head and a second power head;

[0006] A measuring bracket is fixedly installed on the side of the directional drilling rig away from the guide hole, and a camera positioning device is provided on the measuring bracket;

[0007] The double-walled drill rod connected to the directional drilling rig includes an inner drill rod and an outer drill rod that are movably connected and concentrically arranged; the inner drill rod is hollow and serves as an optical measurement channel for light from the camera positioning device to pass through; the annular space between the inner and outer drill rods serves as an annular fluid channel; the outer drill rod is connected to the first power head, and the inner drill rod is connected to the second power head;

[0008] A guide shaft is fixedly connected to the end of the double-walled drill rod away from the guide drill rig. The guide shaft includes an outer guide cylinder, a connecting inner cylinder, and a drive shaft. The inner drill rod and the connecting inner cylinder are fixedly connected and concentrically arranged. The outer drill rod and the outer guide cylinder are fixedly connected and concentrically arranged. The connecting inner cylinder is completely located inside the outer guide cylinder, and the connecting inner cylinder and the outer guide cylinder are rotatably connected and concentrically arranged. Part of the drive shaft is located inside the outer guide cylinder, and the rest of the drive shaft is located outside the outer guide cylinder. The portion of the drive shaft located inside the outer guide cylinder is connected to the connecting inner cylinder. A first target is provided inside the connecting inner cylinder, and the center of the first target coincides with the center of the connecting inner cylinder. The camera positioning device is used to capture an image of the first target.

[0009] The drill bit is connected to the guide shaft, and the diameter of the drill bit is larger than the diameter of the outer drill rod; the portion of the drive shaft located outside the guide outer cylinder is connected to the drill bit.

[0010] In a preferred embodiment, the height of the measuring bracket is higher than the height of the guide drilling rig.

[0011] In a preferred embodiment, the drive shaft is connected to the connecting inner cylinder via a universal joint; the guide outer cylinder is rotatably connected to the connecting inner cylinder via a first bearing; and the outer drill rod is rotatably connected to the inner drill rod via a second bearing.

[0012] In a preferred embodiment, the second bearing includes a plurality of steel balls arranged circumferentially; the outer drill rod has two sealable inlets in the axial direction for mounting the second bearing.

[0013] In a preferred embodiment, an installation cylinder is fixedly provided at one end of the inner connecting cylinder near the drive shaft, and the first target is fixedly installed inside the installation cylinder; the first target is set as a lamp target.

[0014] In a preferred embodiment, a second target is provided inside the connecting inner cylinder, the center of the second target coinciding with the center of the connecting inner cylinder; the second target is located on the side of the first target away from the drive shaft.

[0015] In a preferred embodiment, the second target is set as a prism target, and a prism is fixedly provided on the side of the second target away from the first target; the real-time drilling measurement and positioning borehole system also includes a total station for measuring the trajectory of the guide hole in conjunction with the second target.

[0016] In a preferred embodiment, the real-time drilling measurement and positioning borehole system includes multiple double-walled drill rods, with a centralizer positioned between adjacent double-walled drill rods, and the diameter of the drill bit being larger than the diameter of the centralizer.

[0017] In a preferred embodiment, when the rock hardness is above 100 MPa, the directional drilling rig controls the drilling speed to be 1.5 m / h.

[0018] This specification provides a real-time measurement and positioning drilling method, which is implemented using the real-time measurement and positioning drilling system described in any of the above embodiments. The real-time measurement and positioning drilling method includes the following steps:

[0019] The guide drilling rig is fixedly installed;

[0020] Connect the drill bit, the guide shaft, and the double-walled drill rod;

[0021] Adjust the drill bit's entry angle;

[0022] Open the first and second power heads to drill the pilot hole; allow the drilling mud to enter through the annular fluid channel and carry rock cuttings out through the water hole of the drill bit from the annulus between the outer drill rod and the formation; at the same time, use the camera positioning device to capture images of the first target to determine the deviation of the drill bit;

[0023] When the camera positioning device measures that the offset of the first target exceeds the design trajectory by 0.2%, it guides and corrects the deviation through the guide shaft. When guiding and correcting the deviation, the first power head is turned off, so that the outer drill rod and the guide outer cylinder stop rotating, while the inner drill rod, the connecting inner cylinder, the drive shaft and the drill bit continue to rotate. The inner drill rod and the outer drill rod advance synchronously to correct the deviation.

[0024] Beneficial effects:

[0025] The real-time measurement and positioning drilling system provided in this embodiment, by setting a guide shaft including a guide outer cylinder, a connecting inner cylinder, and a drive shaft, can monitor and correct the inclination of the guide hole in real time during the drilling process, ensuring that the inclination deviation of the drilled hole is no more than 0.5%, for example, no more than 20 cm in the case of a hole depth of 40 m. Specifically, the drive shaft is located between the connecting inner cylinder and the drill bit and is used to transmit torque; the connecting inner cylinder is equipped with a first target, which can be used to monitor whether the drill hole has deviated and adjust the inclination during the correction process, so that the inclination of the drill hole can be quickly adjusted to the required range.

[0026] To address the challenges of high anchor hole accuracy requirements and low drilling efficiency, the directional drilling rig provided in this application has the advantages of strong stability, high torque, and high speed. It is equipped with dual power heads (first power head and second power head) and can work with camera positioning equipment, double-walled drill rods, and guide shafts for high-precision guidance.

[0027] This real-time drilling measurement and positioning system also features a double-walled drill pipe, which enhances rigidity and ensures smooth drilling operations. The inner drill pipe is hollow, serving as an optical measurement channel that works in conjunction with the camera positioning equipment and the first target for deviation correction. The annulus between the inner and outer drill pipes acts as an annular fluid channel, allowing drilling mud to enter through this channel, pass through the water cap into the drive shaft, flow through the drill bit's water inlet, and then carry rock cuttings back out through the annulus between the outer drill pipe and the formation, ensuring smooth drilling operations. In this embodiment, the outer drill pipe controls the direction, while the inner drill pipe rotates to transmit torque, directly driving the drill bit to break the rock. This allows for precise control of the drilling direction, significantly improving the stability, drilling efficiency, and drilling accuracy of the directional drilling rig. Simultaneously, the directional drilling rig provides a stable measurement-while-drilling channel (i.e., an optical measurement channel) for the camera positioning equipment, enhancing measurement accuracy and efficiency.

[0028] During the drilling of the pilot hole, the real-time measurement and positioning drilling system operates with both the first and second power heads activated, and the inner and outer drill rods rotate simultaneously. When adjusting the trajectory (correcting deviation), the first power head is deactivated and the second power head is activated, meaning the outer drill rod stops rotating while the inner drill rod continues to rotate, thus changing from composite drilling to pilot drilling for deviation correction.

[0029] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope as a result.

[0030] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0031] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a real-time drilling measurement and positioning borehole system provided in this embodiment;

[0034] Figure 2This is a schematic diagram of the structure of a directional drilling rig provided in this embodiment;

[0035] Figure 3 This is a schematic diagram of the structure of a guide shaft provided in this embodiment;

[0036] Figure 4 for Figure 3 A schematic diagram of the structure connecting the first and second targets inside the inner cylinder;

[0037] Figure 5 This is a schematic diagram of the structure of a first target provided in this embodiment;

[0038] Figure 6 This is a schematic diagram of a double-walled drill pipe provided in this embodiment;

[0039] Figure 7 for Figure 6 Schematic diagram of the structure of the second bearing in the middle;

[0040] Figure 8 This is a flowchart of the steps of a real-time measurement and positioning drilling method provided in this embodiment;

[0041] Figure 9 , Figure 10 These are images taken by the camera positioning device at different drilling depths of the first target.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Guide shaft; 11. Guide outer cylinder; 12. Connecting inner cylinder; 13. Drive shaft; 14. Universal joint; 15. First bearing; 16. Mounting cylinder; 17. First target; 18. Second target; 19. Prism; 110. Bend point; 111. Tooling; 2. Double-walled drill pipe; 21. Inner drill pipe; 22. Outer drill pipe; 221. Inlet; 23. Optical measurement channel; 24. Annular fluid channel; 25. Second bearing; 251. Steel ball; 3. Guided drilling rig; 31. First power head; 32. Second power head; 4. Measurement bracket; 5. Camera positioning equipment; 51. Light beam; 6. Centralizer; 7. Drill bit. Detailed Implementation

[0044] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0045] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or may be interposed with another element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or may be interposed with another element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0047] Please see Figures 1 to 7 This application provides a real-time measurement and positioning drilling system, characterized in that it includes: a directional drilling rig 3, a measuring support 4, a double-walled drill rod 2 connected to the directional drilling rig 3, a guide shaft 1 fixedly connected to one end of the double-walled drill rod 2 away from the directional drilling rig 3, and a drill bit 7 connected to the guide shaft 1.

[0048] Among them, the directional drilling rig 3 is used to drill a directional hole. For example... Figure 2 As shown, the guide drilling rig 3 is equipped with a first power head 31 and a second power head 32. The measuring bracket 4 is fixedly installed on the side of the guide drilling rig 3 opposite to the guide hole. The measuring bracket 4 is equipped with a camera positioning device 5. Addressing the challenges of high anchor hole accuracy and low drilling efficiency, the guide drilling rig 3 provided in this embodiment has the advantages of high stability, high torque, and high rotational speed. It is equipped with dual power heads (a first power head 31 and a second power head 32), which can cooperate with the camera positioning device 5, the double-walled drill rod 2, and the guide shaft 1 for high-precision guidance.

[0049] like Figure 6 As shown, the double-walled drill rod 2 includes an inner drill rod 21 and an outer drill rod 22 that are movably connected and concentrically arranged. The inner drill rod 21 is hollow, so that the interior of the inner drill rod 21 can serve as an optical measurement channel 23, supplying light 51 from the camera positioning device 5 ( Figure 1The light beam 51 shown is for illustrative purposes only; in actual use, the light beam 51 is not visible to the naked eye. It passes through the drill pipe and works in conjunction with the camera positioning device 5 and the first target 17 of the guide shaft 1 to achieve deviation correction. The annulus between the inner drill pipe 21 and the outer drill pipe 22 serves as an annulus fluid channel 24, allowing drilling mud to enter through this channel, reach the water cap, enter the drive shaft 13, pass through the water hole of the drill bit 7, and then carry rock cuttings back out through the annulus between the outer drill pipe 22 and the formation, ensuring smooth drilling. The outer drill pipe 22 is connected to the first power head 31, which drives the outer drill pipe 22 to rotate and move forward, controlling the drilling direction. The inner drill pipe 21 is connected to the second power head 32, which drives the inner drill pipe 21 to rotate and move forward. The diameter of the drill bit 7 is larger than the diameter of the outer drill pipe 22, ensuring that the drilling mud carrying rock cuttings can return through the annulus between the outer drill pipe 22 and the formation.

[0050] This real-time drilling measurement and positioning system enhances rigidity and ensures smooth drilling by incorporating a double-walled drill rod 2. The double-walled drill rod 2 is highly rigid and has high torque transmission efficiency. For the first time in China, it is used in conjunction with a camera positioning device 5. While transmitting power to the drill bit 7, it provides a dry, centered optical measurement channel 23, enabling real-time measurement during drilling.

[0051] like Figure 3 As shown, the guide shaft 1 includes a guide outer cylinder 11, a connecting inner cylinder 12, and a drive shaft 13. The end of the inner drill rod 21 furthest from the guide drill 3 is fixedly connected to the connecting inner cylinder 12 and concentrically arranged. The end of the outer drill rod 22 furthest from the guide drill 3 is fixedly connected to the guide outer cylinder 11 and concentrically arranged. The connecting inner cylinder 12 is completely located inside the guide outer cylinder 11. The connecting inner cylinder 12 is used to transmit torque, and the guide outer cylinder 11 is used for guidance. The connecting inner cylinder 12 and the guide outer cylinder 11 are rotatably connected and concentrically arranged. Part of the drive shaft 13 is located inside the guide outer cylinder 11, and the remainder is located outside the guide outer cylinder 11. The portion of the drive shaft 13 located inside the guide outer cylinder 11 is connected to the connecting inner cylinder 12. The portion of the drive shaft 13 located outside the guide outer cylinder 11 is connected to the drill bit 7. The drive shaft 13 can continue to transmit the torque transmitted by the connecting inner cylinder 12 to the drill bit 7. The connecting inner cylinder 12 is equipped with a first target 17, the center of which coincides with the center of the connecting inner cylinder 12. The first target 17 is used to monitor whether the borehole has deviated and to adjust the inclination during the correction process, so that the borehole inclination is quickly adjusted to the required range. The camera positioning device 5 is used to capture images of the first target 17, allowing for observation of the first target 17 throughout the drilling process. The light 51 of the camera positioning device 5 passes through the optical measurement channel 23 to capture images of the first target 17, and the captured images are as follows: Figure 9 , Figure 10 As shown.

[0052] The guide shaft 1 provided in this application has guiding, measuring and shock absorption functions. It is the first high-angle guide shaft 1 used in China. It can measure and correct deviation in time during the drilling of the guide hole, so that the inclination deviation of the drilled hole is no more than 0.5%. For example, when the hole depth is 40m, the inclination deviation is no more than 20cm.

[0053] In this embodiment, the outer drill rod 22 and the guide outer cylinder 11 control the drilling direction, while the inner drill rod 21, the connecting inner cylinder 12, and the drive shaft 13 rotate to transmit torque, directly driving the drill bit 7 to break the rock. This allows for precise control of the drilling direction, greatly improving the stability, drilling efficiency, and drilling accuracy of the directional drilling rig 3. At the same time, the directional drilling rig 3 also provides a stable measurement channel (i.e., optical measurement channel 23) for the camera positioning device 5, enhancing measurement accuracy and efficiency.

[0054] During the drilling process of the pilot hole, the real-time measurement and positioning drilling system operates with both the first power head 31 and the second power head 32 engaged, causing the inner drill rod 21 and the outer drill rod 22 to rotate simultaneously. When adjusting the trajectory (correcting deviation), the first power head 31 is deactivated, and the second power head 32 is activated. This means the outer drill rod 22 stops rotating while the inner drill rod 21 continues to rotate, switching from composite drilling to pilot drilling for deviation correction. In other words, the real-time measurement and positioning drilling system has both a drilling state and a deviation correction state. When the system is in the drilling state, both the first power head 31 and the second power head 32 are engaged, driving the outer drill rod 22 and the inner drill rod 21 to rotate. The outer drill rod 22 drives the outer guide cylinder 11 to rotate, and the inner drill rod 21 drives the inner connecting cylinder 12, the drive shaft 13, and the drill bit 7 to rotate. When the real-time drilling measurement and positioning drilling system is in the correction state, the first power head 31 is closed, the second power head 32 is opened, the outer drill rod 22 stops rotating, and the inner drill rod 21 continues to rotate, driving the connecting inner cylinder 12, the drive shaft 13 and the drill bit 7 to rotate and correct the deviation.

[0055] In this embodiment, the height of the measuring bracket 4 is higher than the height of the guide drill 3, enabling the camera positioning device 5 to smoothly monitor the offset of the first target 17. The bottom surfaces of the measuring bracket 4 and the guide drill 3 are on the same horizontal plane.

[0056] like Figure 3As shown, the drive shaft 13 is connected to the connecting inner cylinder 12 via a universal joint 14, so that a bend 110 can be formed between the drive shaft 13 and the connecting inner cylinder 12, that is, the drive shaft 13 and the connecting inner cylinder 12 can have a certain angle, such as 1°, so that the drill bit 7 connected to the drive shaft 13 can not only rotate around the central axis of the drill bit 7 body, but also have a certain oscillation, thereby achieving a better drilling effect.

[0057] like Figure 4 As shown, a mounting cylinder 16 is fixedly provided inside the inner connecting cylinder 12 near one end of the drive shaft 13, and the first target 17 is fixedly installed inside the mounting cylinder 16. Figure 5 As shown, the first target 17 is preferably configured as a lamp target, which has multiple asymmetrically arranged luminous LED beads. The lamp target is a self-luminous target with multiple luminous beads, and there is a farthest LED bead, which can be easily identified by taking a picture. The farthest LED bead is 2cm away from the center of the lamp target. The luminous image of the first target 17 is captured by the camera positioning device 5 on the measuring bracket 4, thereby determining the deviation of the drill bit 7.

[0058] In one embodiment, a second target 18 is further provided inside the connecting inner cylinder 12, the center of the second target 18 coinciding with the center of the connecting inner cylinder 12. The second target 18 is located on the side of the first target 17 away from the drive shaft 13, and the second target 18 can be used in conjunction with a total station to determine whether the drilled hole has deviated.

[0059] Specifically, the second target 18 is configured as a prism target, and a prism 19 is fixedly mounted on the side of the second target 18 away from the first target 17. The prism 19 is fixedly installed in the mounting cylinder 16 by a tooling 111. The real-time drilling measurement and positioning system also includes a total station for measuring the trajectory of the guide hole in conjunction with the second target 18. To prevent the first target 17 and the camera positioning device 5 from failing, after drilling a certain distance, the inclination of the drilled hole can be measured using the second target 18, the prism 19, and the total station to ensure that the inclination of the drilled hole meets the requirements. By using the first target 17 and the camera positioning device 5, the measurement and verification frequency is increased, and the trajectory is re-measured using the total station and the second target 18, and deviations are frequently corrected to ensure that the drilling accuracy meets the design requirements.

[0060] like Figure 3 As shown, the guide outer cylinder 11 and the connecting inner cylinder 12 are rotatably connected by a first bearing 15. The first bearing 15 can be a TC string bearing. A straightening sleeve for straightening can be provided on the guide outer cylinder 11.

[0061] To address the challenges of difficult and inefficient rock breaking caused by the high strength of slightly weathered andesite, drill bit 7 is made of high-quality diamond composite material, combined with a customized design to improve rock breaking efficiency and abrasion resistance. Specifically, drill bit 7 is preferably a PDC (polycrystalline diamond composite) drill bit. In this embodiment, when the rock hardness is above 100 MPa, the directional drilling rig 3 controls the drilling speed at 1.5 meters per hour to ensure smooth drilling.

[0062] In this embodiment, the outer drill rod 22 and the inner drill rod 21 are rotatably connected via a second bearing 25, so that the inner drill rod 21 is centered on the outer drill rod 22. Figure 7 As shown, the second bearing 25 includes a plurality of steel balls 251 arranged circumferentially. Figure 6 As shown, the outer drill rod 22 has two sealable inlets 221 in the axial direction for installing the second bearing 25. Multiple steel balls 251 enter between the outer drill rod 22 and the inner drill rod 21 through the inlets 221. After the steel balls 251 are installed, the inlets 221 are sealed.

[0063] Specifically, the real-time measurement and positioning borehole system includes multiple double-walled drill pipes 2, with a centralizer 6 positioned between adjacent double-walled drill pipes 2. The diameter of the drill bit 7 is larger than the diameter of the centralizer 6, ensuring that the drilling mud carrying rock cuttings can be returned through the annulus between the outer drill pipe 22 and the formation.

[0064] In a specific application scenario, the extension of the double-walled drill pipe 2 is assisted by a crane. During drilling, drilling mud enters through the annular fluid channel 24 between the double-walled drill pipes 2 and returns with rock cuttings through the water hole of the drill bit 7. During the pilot hole drilling process, surveyors monitor the drilling trajectory using a camera positioning device 5, and use the camera positioning device 5 to observe the first target 17 placed at the center of the guide shaft 1 throughout the drilling process. The measurement interval is 0.5m to 2m for the first 10m of drilling, 3m for 10m to 20m, and no more than 5m after 20m. Drilling is stopped before measurement, and the offset of the first target 17 is measured. If the deviation from the design trajectory exceeds 0.2%, it is adjusted in time via the guide shaft 1. The three-dimensional drilling trajectory can be plotted and compared with the design trajectory. If a trajectory deviation occurs, it is corrected in time via the guide shaft 1. During guide correction, the outer drill pipe 22 stops rotating and the tool face is determined; the inner drill pipe 21 continues to rotate. The inner and outer drill pipes 22 advance synchronously for correction. During the drilling process, the trajectory can be re-measured at any time using a gyro inclinometer.

[0065] In one embodiment, the drill bit 7 may have a diameter of 241.3 mm. The double-walled drill pipe 2 may have a diameter of 168 mm. The centralizer 6 may have a diameter of 238 mm.

[0066] Based on the same concept, this invention also provides a real-time measurement-while-drilling (MWD) positioning borehole method, as described in the following embodiments. It should be noted that the MWD method is implemented using the MWD system described in any of the above embodiments. This drilling method implementation corresponds to the drilling system implementation, and it can solve the technical problems solved by the drilling system implementation, thereby achieving the corresponding technical effects. Specific details will not be elaborated further in this application.

[0067] like Figure 8 As shown, the real-time drilling measurement and positioning borehole method includes the following steps:

[0068] Step S10: Fix and install the guide drilling rig 3.

[0069] Step S20: Connect the drill bit 7, the guide shaft 1, and the double-walled drill rod 2.

[0070] Step S30: Adjust the entry angle of drill bit 7.

[0071] Step S40: Open the first power head 31 and the second power head 32 to drill the guide hole.

[0072] In step S40, mud is introduced into the annular fluid channel 24 and carried out through the water hole of the drill bit 7, carrying rock cuttings, and exited from the annulus between the outer drill pipe 22 and the formation; at the same time, the camera positioning device 5 is used to capture an image of the first target 17 to determine the deviation of the drill bit 7.

[0073] Step S50: When the camera positioning device 5 measures that the offset of the first target 17 exceeds 0.2% of the designed trajectory, it performs guidance and correction through the guide shaft 1.

[0074] In step S50, when performing guidance and correction, the first power head 31 is turned off, causing the outer drill rod 22 and the guide outer cylinder 11 to stop rotating, while the inner drill rod 21, the connecting inner cylinder 12, the drive shaft 13 and the drill bit 7 continue to rotate. The inner drill rod 21 and the outer drill rod 22 advance synchronously to perform correction.

[0075] It should be noted that in the description of this specification, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this specification, unless otherwise stated, "a plurality of" means two or more.

[0076] Any numerical values ​​cited herein include all values ​​ranging from a lower limit to an upper limit, increasing by one unit, with at least two units between any lower and any higher value. For example, if the quantity of a component or the value of a process variable (e.g., temperature, pressure, time, etc.) is described as being from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, a unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1, etc. These are merely examples intended for explicit expression, and it can be assumed that all possible combinations of values ​​listed between the minimum and maximum values ​​are explicitly described in this specification in a similar manner.

[0077] Unless otherwise stated, all ranges include the endpoints and all numbers between them. The terms "approximately" or "about" used with ranges apply to both endpoints of the range. Thus, "approximately 20 to 30" is intended to cover "approximately 20 to approximately 30," including at least the specified endpoints.

[0078] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified elements, components, parts, or steps, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute included by “may” is optional.

[0079] Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The use of "a" or "an" to describe an element, component, part, or step does not imply the exclusion of other elements, components, parts, or steps.

[0080] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but rather by reference to the appended claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the inventors have not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A real-time measurement-while-drilling positioning borehole system, characterized by, The real-time measurement and positioning drilling system comprises: a guide drill rig provided with a first power head and a second power head; a measurement support fixedly arranged on one side of the guide drill rig, the measurement support being provided with a camera positioning device; a double-wall drill rod connected with the guide drill rig, the double-wall drill rod comprising an inner drill rod and an outer drill rod which are movably connected and concentrically arranged; the inner drill rod is hollow; the outer drill rod is connected with the first power head, and the inner drill rod is connected with the second power head; a guide shaft fixedly connected with one end of the double-wall drill rod away from the guide drill rig, the guide shaft comprising a guide outer cylinder, a connecting inner cylinder and a transmission shaft; the inner drill rod and the connecting inner cylinder are fixedly connected and concentrically arranged; the outer drill rod and the guide outer cylinder are fixedly connected and concentrically arranged; the connecting inner cylinder is completely located in the guide outer cylinder, and the connecting inner cylinder and the guide outer cylinder are movably connected and concentrically arranged; the part of the transmission shaft located in the guide outer cylinder is connected with the connecting inner cylinder, and the rest of the transmission shaft is located outside the guide outer cylinder; the connecting inner cylinder is provided with a first target, and the center of the first target coincides with the center of the connecting inner cylinder; the first target is a lamp target, and the lamp target is a self-luminous target; a drill bit connected with the guide shaft, the drill bit having a diameter greater than that of the outer drill rod; the part of the transmission shaft located outside the guide outer cylinder is connected with the drill bit; the connecting inner cylinder is provided with a second target, and the center of the second target coincides with the center of the connecting inner cylinder; the second target is located on the side of the first target away from the transmission shaft; the second target is arranged as a prism target, and the side of the second target away from the first target is fixedly provided with a prism; the real-time measurement and positioning drilling system further comprises a total station for cooperating with the second target to measure the trajectory of the guide hole.

2. The real-time, measurement-while-drilling, position-while-drilling system of claim 1, wherein, The height of the measurement support is higher than the height of the guide drill rig.

3. The real-time, measurement-while-drilling, position-while-drilling system of claim 1, wherein, The transmission shaft and the connecting inner cylinder are connected through a universal shaft; the guide outer cylinder and the connecting inner cylinder are movably connected through a first bearing; the outer drill rod and the inner drill rod are movably connected through a second bearing.

4. The real-time, measurement-while-drilling, position-while-drilling system of claim 3, wherein, The second bearing comprises a plurality of steel balls arranged in a circumferential direction; the outer drill rod is provided with two sealable inlets in an axial direction for mounting the second bearing.

5. The real-time, measurement-while-drilling, position-while-drilling system of claim 1, wherein, One end of the connecting inner cylinder close to the transmission shaft is fixedly provided with a mounting cylinder, and the first target is fixedly mounted in the mounting cylinder.

6. The real-time, measurement-while-drilling, position-while-drilling system of claim 1, wherein, The real-time measurement and positioning drilling system comprises a plurality of double-wall drill rods, and a centralizer is arranged between adjacent double-wall drill rods; the diameter of the drill bit is greater than that of the centralizer.

7. The real-time, measurement-while-drilling, position-while-drilling system of claim 1, wherein, When the hardness of the rock is greater than or equal to 100 MPa, the guide drill rig controls the drilling speed to be 1.5 m / h.

8. A method of real-time measurement-while-drilling positioning of a borehole, characterized by, The real-time measurement and positioning drilling method is implemented by using the real-time measurement and positioning drilling system according to any one of claims 1-7, and the real-time measurement and positioning drilling method comprises the following steps: fixedly mounting the guide drill rig; connecting the drill bit, the guide shaft and the double-wall drill rod; adjusting the drilling inclination angle of the drill bit; opening the first power head and the second power head to drill the guide hole; the annulus between the inner drill rod and the outer drill rod serves as an annulus fluid passage, so that the mud enters from the annulus fluid passage and carries the rock cuttings from the annulus between the outer drill rod and the formation to the water eye of the drill bit; meanwhile, the camera positioning device is used to shoot the image of the first target to determine the deviation of the drill bit. When the camera positioning device measures that the offset of the first target exceeds 0.2% of the design trajectory, the guiding and correcting is performed through the guide shaft; when the guiding and correcting is performed, the first power head is closed, the outer drill rod and the guide outer cylinder are stopped rotating, the inner drill rod, the connecting inner cylinder, the transmission shaft and the drill bit continue rotating, the inner drill rod and the outer drill rod advance synchronously, and the correcting is performed.

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