Bedrock large-diameter drilling hole wall correction system

Abstract

The invention discloses a bed rock large-diameter drilling hole wall correction system, and belongs to the technical field of drilling tool drilling, and the bed rock large-diameter drilling hole wall correction system comprises a correction drilling tool used for carrying out large-diameter drilling action on bed rock; the space feedback system is used for adjusting the drilling direction of the correction drilling tool in real time according to the drilling condition and ensuring the perpendicularity of a drilled hole; the space feedback system comprises a measurement module and a correction module, and the measurement module is used for obtaining the drilling position of the correction drilling tool to obtain first measurement data; the correction module compares the first measurement data with stored preset data and judges whether the drilling state of the corrected drilling tool is abnormal or not according to a comparison result; and if yes, correcting the corrected drilling tool. The correction drilling tool and the space feedback system are matched, the large-diameter drilling action is conducted on the bed rock, the drilling direction of the correction drilling tool is adjusted in real time according to the drilling condition, and the drilling perpendicularity is ensured.

Description

Technical Field

[0001] The present application relates to a bedrock large-diameter borehole wall correction system, belonging to the technical field of drilling tools. Background Art

[0002] For large-diameter bedrock drilling, especially in medium-soft formations, where mudstone and sandstone are interbedded with each other at large formation inclination angles, the borehole is prone to bending; when the combined roller drill is used for hole expansion and drilling, spiral irregularities appear on the hole wall, and the casing cannot be lowered into place; in some karst and fissure-developed areas, where caves are filled with clay formations, the borehole is prone to "sharp bends". Therefore, in order to ensure the verticality of the borehole, prevent the drill rod from breaking due to large torque, or lower the casing to the predetermined position, large-diameter bedrock drilling often requires correction of the hole wall.

[0003] Conventional hole repairing drilling tools are connected to the drill bit hole repairer after the three-cone drill bit, and the drill collar is connected to the drill string hole repairer. The outer diameter of this type of hole repairer is slightly smaller than the diameter of the three-cone drill bit, larger than the diameter of the guide tube clamp, and the curvature of the top angle of the borehole is small, so the casing can be lowered after drilling. However, for large-diameter bedrock drilling, since the borehole diameter is large and exceeds the diameter of the three-cone drill bit, the combined hole expansion cone drill bit has no matching borehole wall corrector, and the production of a borehole corrector similar to that of a three-cone drill bit is often difficult to process and extremely expensive, resulting in a high drilling cost.

[0004] Therefore, a bedrock large-diameter borehole wall correction system is needed to ensure the verticality of the borehole. Summary of the invention

[0005] According to one aspect of the present application, a bedrock large-diameter borehole wall correction system is provided. The system cooperates with a correction drill tool and a spatial feedback system to perform large-diameter drilling on the bedrock and adjusts the drilling direction of the correction drill tool in real time according to the drilling situation to ensure the verticality of the borehole.

[0006] A bedrock large-diameter borehole wall correction system, characterized by comprising:

[0007] A modified drilling tool for performing a large-diameter drilling action on said bedrock;

[0008] A spatial feedback system is used to adjust the drilling direction of the correction drill in real time according to the drilling situation to ensure the verticality of the drill hole;

[0009] The spatial feedback system includes a measurement module and a correction module. The measurement module is used to obtain the drilling position of the correction drill to obtain first measurement data. The correction module compares the first measurement data with the stored preset data and determines whether the drilling state of the correction drill is abnormal according to the comparison result. If so, the correction processing is performed on the correction drill.

[0010] Wherein, a first constraint condition and a second constraint condition are set for the preset data, and the first constraint condition is: a <P1<P b ; The second constraint is: P c <P2<P d ; Among them, P a represents the lower limit of pressure for controlling the drilling of the first formation, P b represents the upper limit of pressure for controlling the drilling of the first formation, P c represents the lower limit of pressure for controlling the drilling of the second formation, P d Represents the upper limit of pressure for controlling drilling in the second formation.

[0011] Further, obtaining the drilling position of the modified drilling tool to obtain first measurement data includes:

[0012] Collecting hole wall projection points: At the current drilling level, use a measuring device to capture and record information on at least two hole wall projection points;

[0013] Establishing a first polar coordinate system: calculating a first spatial position of the hole wall imaging point in the first polar coordinate system according to the parameters of the measuring device and at least two hole wall projection points;

[0014] Establishing the second polar coordinates of the borehole wall: establishing a coordinate transformation relationship between the first polar coordinates and the second polar coordinates according to the positional relationship between the measuring device and the borehole space, obtaining a second spatial position of the borehole wall imaging point in the second polar coordinates according to the first spatial position and the coordinate transformation relationship, and obtaining a spatial coordinate system of the borehole wall according to the second spatial positions of the borehole wall imaging points at at least two consecutive horizontal heights;

[0015] The drilling position of the modified drilling tool in the spatial coordinate system is determined, and first measurement data of the modified drilling tool at the drilling position is obtained.

[0016] Furthermore, the correction drilling tool comprises a barrel, an upper drill body and a lower drill body arranged at the upper and lower ends of the barrel, and a drill pipe joint connected to the upper end of the upper drill body;

[0017] The outer periphery of the cylinder is welded with a diameter-retaining alloy palm, and the diameter-retaining alloy palm is arranged in a spiral shape;

[0018] The outer periphery of the upper hole repairer is provided with a plurality of upper spiral ribs, and the upper cutting alloy group is welded on the upper spiral ribs;

[0019] A plurality of lower spiral ribs are arranged on the periphery of the lower hole repairer, and a lower cutting alloy group is welded on the lower spiral ribs.

[0020] Furthermore, the lower end of the drill pipe joint is threadedly connected to the upper end of the upper hole repairer body;

[0021] The upper spiral ribs are at least six, and the lower spiral ribs are at least six;

[0022] The width of the upper spiral rib is 50 to 80 mm, and the width of the lower spiral rib is 50 to 80 mm;

[0023] The sum of the outer diameter of the upper hole repairer body and the height of the upper spiral rib is less than 10 mm of the borehole diameter, and the sum of the outer diameter of the lower hole repairer and the height of the lower spiral rib is less than 10 mm of the borehole diameter;

[0024] The sum of the outer diameter of the upper hole repairer body, the height of the upper spiral ribs and the height of the upper cutting alloy group is less than 4mm of the borehole diameter, and the sum of the outer diameter of the lower hole repairer body, the height of the lower spiral ribs and the height of the lower cutting alloy group is less than 4mm of the borehole diameter.

[0025] Furthermore, the upper cutting alloy group includes a plurality of evenly arranged upper gauge alloys, and the upper gauge alloys on adjacent upper cutting alloy groups are staggered and welded on the upper spiral ribs;

[0026] The lower cutting alloy group includes a plurality of lower gauge alloys arranged evenly, and the lower gauge alloys on adjacent lower cutting alloy groups are staggered and welded on the lower spiral ribs;

[0027] The height of the upper gauge alloy is 0.5 mm, and the distance between adjacent upper gauge alloys on the upper cutting alloy group is 30 mm;

[0028] The height of the lower gauge alloy is 0.5 mm, and the distance between adjacent lower gauge alloys on the lower cutting alloy group is 30 mm.

[0029] Further, the first measurement data is compared with the stored preset data, and it is determined whether the drilling state of the corrected drilling tool is abnormal according to the comparison result; if so, the corrected drilling tool is corrected, including:

[0030] Analyze the deviation direction and deviation amount of the hole axis during the drilling process according to the first measurement data, determine the setting position of the correction drill according to the analysis result, and control the drilling pressure of the correction drill during the deviation correction drilling process;

[0031] wherein the current drilling pressure of the modified drilling tool is set as the initial drilling pressure;

[0032] Determine whether the initial drilling pressure is within the first constraint condition; if not, correspondingly control the drilling pressure of the correction drilling tool during the deviation correction drilling process within the first formation range;

[0033] It is determined whether the current drilling pressure of the first formation is within the second constraint condition. If not, the drilling pressure of the correction drill is controlled accordingly during the deviation correction drilling process within the second formation range.

[0034] Furthermore, the determination of the stored preset data includes the following steps:

[0035] According to the lithology data of the core well, the rock phase types of the target block are divided;

[0036] Establish the confining pressure characteristics of rock static mechanical parameters of different rock phases;

[0037] Using the experimental data under different confining pressures, the prediction curve of rock static mechanical parameters under the same confining pressure conditions for different rocks is established;

[0038] Establish the relationship curve between reservoir confining pressure and burial depth;

[0039] Obtain preset data of reservoir confining pressure at different burial depths.

[0040] The beneficial effects of this application include:

[0041] The present application provides a bedrock large-diameter borehole wall correction system, which comprises a correction drill and a spatial feedback, wherein the correction drill is used to perform large-diameter drilling on the bedrock; the spatial feedback system is used to adjust the drilling direction of the correction drill in real time according to the drilling situation to ensure the verticality of the borehole; the spatial feedback system comprises a measurement module and a correction module, wherein the measurement module is used to obtain the drilling position of the correction drill and obtain first measurement data; the correction module compares the first measurement data with the stored preset data, and determines whether the drilling state of the correction drill is abnormal according to the comparison result; if so, the correction processing is performed on the correction drill; wherein a first constraint condition and a second constraint condition are set for the preset data, and the first constraint condition is: P a <P1<P b ; The second constraint is: P c <P2<P d。 Therefore, by coordinating the correction drill tool and the spatial feedback system, large-diameter drilling is performed on the bedrock and the drilling direction of the correction drill tool is adjusted in real time according to the drilling situation to ensure the verticality of the borehole, and the drilling pressure is controlled when drilling different adjacent formations to achieve better drilling results. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A system structure diagram in one embodiment of the present application;

[0043] Figure 2 This is a schematic diagram of the structure of a correction drill tool in one embodiment of the present application;

[0044] List of parts and reference numerals: 1-drill pipe joint; 2-upper hole repairer body; 3-upper spiral rib; 4-upper cutting alloy group; 5-upper gauge alloy; 6-barrel; 7-gauge alloy palm; 8-lower gauge alloy; 9-lower cutting alloy group; 10-lower spiral rib; 11-lower hole repairer body. DETAILED DESCRIPTION

[0045] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0046] like Figure 1-2 As shown, a bedrock large-diameter borehole wall correction system is characterized by comprising:

[0047] A modified drilling tool for performing a large-diameter drilling action on said bedrock;

[0048] A spatial feedback system is used to adjust the drilling direction of the correction drill in real time according to the drilling situation to ensure the verticality of the drill hole;

[0049] The spatial feedback system includes a measurement module and a correction module. The measurement module is used to obtain the drilling position of the correction drill to obtain first measurement data. The correction module compares the first measurement data with the stored preset data and determines whether the drilling state of the correction drill is abnormal according to the comparison result. If so, the correction processing is performed on the correction drill.

[0050] Wherein, a first constraint condition and a second constraint condition are set for the preset data, and the first constraint condition is: a <P1<P b ; The second constraint is: P c <P2<P d ; Among them, P a represents the lower limit of pressure for controlling the drilling of the first formation, P b represents the upper limit of pressure for controlling the drilling of the first formation, P c represents the lower limit of pressure for controlling the drilling of the second formation, P d Represents the upper limit of pressure for controlling drilling in the second formation.

[0051] Specifically, the present application ensures the verticality and accuracy of the borehole by using a correction drill and a spatial feedback system. The spatial feedback system includes a measurement module and a correction module, which work together to monitor and adjust the drilling status of the correction drill in real time.

[0052] The measurement module is responsible for obtaining the drilling position of the correction drill, that is, understanding the specific position of the drill in the bedrock in real time. Through this step, we get the first measurement data, which is the basis for subsequent analysis and adjustment.

[0053] The correction module compares the first measured data with the preset data. The preset data is set according to the geological exploration results and engineering requirements, and includes the allowable pressure range when drilling in different strata. In this problem, the preset data is concretized as the pressure control range of two adjacent strata, that is, the first stratum (P a <P1<P b ) and the second stratum (P c <P2<P d ).

[0054] The first constraint (P a <P1<P b ) is the pressure range for controlling the drilling of the first formation. If the measured pressure P1 exceeds this range, it means that the correction drilling tool may have an abnormality when drilling into the first formation and needs to be corrected.

[0055] The second constraint (P c <P2<P d ) is the pressure range for controlling the drilling of the second formation. Similarly, if the measured pressure P2 exceeds this range, it also indicates that the correction drilling tool may have an abnormality when drilling into the second formation.

[0056] Once the correction module determines that the drilling state of the correction drill is abnormal (i.e. the pressure exceeds the preset range), it will initiate the correction process. The correction process may include adjusting the drilling speed of the drill, changing the angle of the drill bit, or applying additional force to return the drill to the correct drilling trajectory.

[0057] Acquiring the drilling position of the modified drilling tool to obtain first measurement data includes:

[0058] Collecting hole wall projection points: At the current drilling level, use a measuring device to capture and record information on at least two hole wall projection points;

[0059] Establishing a first polar coordinate system: calculating a first spatial position of the hole wall imaging point in the first polar coordinate system according to the parameters of the measuring device and at least two hole wall projection points;

[0060] Establishing the second polar coordinates of the borehole wall: establishing a coordinate transformation relationship between the first polar coordinates and the second polar coordinates according to the positional relationship between the measuring device and the borehole space, obtaining a second spatial position of the borehole wall imaging point in the second polar coordinates according to the first spatial position and the coordinate transformation relationship, and obtaining a spatial coordinate system of the borehole wall according to the second spatial positions of the borehole wall imaging points at at least two consecutive horizontal heights;

[0061] The drilling position of the modified drilling tool in the spatial coordinate system is determined, and first measurement data of the modified drilling tool at the drilling position is obtained.

[0062] Specifically, at the current horizontal height (or depth) of the borehole, a high-precision measuring device (such as a laser rangefinder, a camera combined with image processing technology, etc.) is used to capture and record the information of at least two borehole wall projection points. These projection points can be bright spots formed by reflected or scattered light on the borehole wall, or points determined by other means (such as ultrasonic reflection). According to the parameters of the measuring device (such as the focal length and viewing angle of the lens, etc.) and the information of at least two borehole wall projection points captured, the first spatial position of these borehole wall imaging points in the first polar coordinate system is solved by a mathematical solution method (such as triangulation). The first polar coordinate system is usually established with the measuring device as the center, and is used to preliminarily represent the relative position of the borehole wall projection point. Next, it is necessary to establish a coordinate transformation relationship between the first polar coordinate system and the second polar coordinate system of the borehole wall according to the actual position relationship between the measuring device and the borehole space. This transformation relationship may involve transformations such as rotation and translation to ensure the transformation from the perspective of the measuring device to the perspective of the borehole wall. Using this coordinate transformation relationship, the first spatial position of the borehole wall imaging point in the first polar coordinate system is converted to the second spatial position in the second polar coordinate system. In this way, each borehole wall imaging point has an accurate position in the borehole wall coordinate system. By repeating the above process at multiple consecutive horizontal heights and collecting enough borehole wall imaging points, a three-dimensional spatial coordinate system of the borehole wall can be constructed. This coordinate system accurately reflects the shape and position of the borehole wall. In the established borehole wall spatial coordinate system, the position information of the correction drill is obtained in real time through a measuring device or other sensors (such as a gyroscope, accelerometer, etc.). The position information of the correction drill is converted to the spatial coordinate system of the borehole wall to determine the precise drilling position of the correction drill in the borehole wall coordinate system. At the same time, the drilling information of the correction drill at the drilling position is obtained, which includes the depth, direction, and specific position of the correction drill relative to the borehole wall in the borehole, as well as the drilling speed and drilling pressure.

[0063] Through the above steps, the system can obtain the position information of the correction drill in the borehole in real time and accurately, providing reliable data support for subsequent drilling direction adjustment and hole wall correction.

[0064] The correction drilling tool comprises a barrel 6, an upper drill body 2 and a lower drill body 11 arranged at the upper and lower ends of the barrel 6, and a drill pipe joint 1 connected to the upper end of the upper drill body 2;

[0065] The outer periphery of the cylinder 6 is welded with a diameter-retaining alloy palm 7, and the diameter-retaining alloy palm 7 is arranged in a spiral shape;

[0066] The outer periphery of the upper hole repairer is provided with a plurality of upper spiral ribs 3, and an upper cutting alloy group 4 is welded on the upper spiral ribs 3;

[0067] A plurality of lower spiral ribs 10 are arranged on the periphery of the lower hole repairer, and a lower cutting alloy group 9 is welded on the lower spiral ribs 10 .

[0068] Specifically, the correction drill tool structure is a complex tool for correcting the borehole wall in large-diameter boreholes in bedrock, wherein the barrel is the main part of the entire correction drill tool, which connects the upper borer body and the lower borer body, and provides support and protection. The material of the barrel needs to be strong enough to withstand various stresses and impact forces during the drilling process. The upper borer body and the lower borer body are respectively arranged at the upper and lower ends of the barrel, and they each have different functions. The lower borer body is usually used for preliminary cutting and correction of the borehole wall, while the upper borer body may focus more on further smoothing of the borehole wall and precise size control.

[0069] The drill pipe joint is connected to the upper end of the upper drill body and is used to connect the correction drill to the drill pipe or other drilling equipment. In this way, the correction drill can perform drilling and correction operations through the torque and thrust transmitted by the drill pipe. The diameter-retaining alloy palms are welded on the outer periphery of the cylinder and arranged in a spiral shape. The main function of these alloy palms is to maintain the diameter of the drill hole stable and prevent the hole diameter from expanding or shrinking. The spiral arrangement helps to evenly support the hole wall during the drilling process and improve the verticality and roundness of the drill hole.

[0070] The upper hole repairer is provided with a plurality of upper spiral ribs on the periphery, and the upper cutting alloy group is welded on these ribs. The upper cutting alloy group is used to cut and correct the upper area of ​​the hole wall. Through rotation and feeding movement, they can remove the uneven parts on the hole wall and make the hole wall smoother and more regular. The lower hole repairer is also provided with a plurality of lower spiral ribs on the periphery, and the lower cutting alloy group is welded on them. These parts are mainly used to cut and correct the lower area of ​​the hole wall, and work together with the upper cutting alloy group to ensure the uniformity and consistency of the entire drilled hole wall.

[0071] Therefore, the correction drill can effectively correct the hole wall during the large-diameter drilling process in bedrock through its unique design structure. The synergistic effect of the diameter-protecting alloy palm, the upper spiral rib and the upper cutting alloy group, the lower spiral rib and the lower cutting alloy group and other components enables the correction drill to accurately cut and correct the hole wall, thereby improving the quality and efficiency of drilling.

[0072] The lower end of the drill pipe joint 1 is threadedly connected to the upper end of the upper hole repairer body 2;

[0073] The upper spiral ribs 3 have at least six pieces, and the lower spiral ribs 10 have at least six pieces;

[0074] The width of the upper spiral rib 3 is 50-80 mm, and the width of the lower spiral rib 10 is 50-80 mm;

[0075] The sum of the outer diameter of the upper hole repairer body 2 and the height of the upper spiral rib 3 is less than 10 mm of the borehole diameter, and the sum of the outer diameter of the lower hole repairer and the height of the lower spiral rib 10 is less than 10 mm of the borehole diameter;

[0076] The sum of the outer diameter of the upper hole repairer body 2, the height of the upper spiral rib 3 and the height of the upper cutting alloy group 4 is less than the borehole diameter of 4 mm, and the sum of the outer diameter of the lower hole repairer body 11, the height of the lower spiral rib 10 and the height of the lower cutting alloy group 9 is less than the borehole diameter of 4 mm.

[0077] Specifically, the lower end of the drill pipe joint is connected to the upper end of the upper hole repairer body by threading. This connection method is both firm and convenient for disassembly and replacement, ensuring the stability and reliability of the correction drill during drilling. There are at least six upper spiral ribs and lower spiral ribs. The number of these spiral ribs is designed to provide sufficient support and cutting force during drilling while maintaining the uniformity and stability of the hole wall. The width of the upper spiral ribs and the lower spiral ribs is 50 to 80 mm. This width range is determined based on the borehole diameter and the required cutting force, aiming to ensure that the spiral ribs can effectively cut the hole wall and support the hole wall structure. The sum of the outer diameter of the upper hole repairer body and the height of the upper spiral ribs is less than 10 mm of the borehole diameter, and the sum of the outer diameter of the lower hole repairer and the height of the lower spiral ribs is less than 10 mm of the borehole diameter. This design is to ensure that the correction drill will not have serious friction or jamming with the hole wall during drilling, while leaving enough space for the cutting alloy group to perform cutting operations. The sum of the outer diameter of the upper hole repairer body, the height of the upper spiral ribs and the height of the upper cutting alloy group is less than 4mm of the drilled hole diameter, and the sum of the outer diameter of the lower hole repairer body, the height of the lower spiral ribs and the height of the lower cutting alloy group is less than 4mm of the drilled hole diameter. This stricter restriction is to ensure that the cutting alloy group will not exceed the predetermined diameter range of the drilled hole when cutting the hole wall, thereby ensuring the accuracy and quality of the drilled hole.

[0078] In summary, these design parameters together constitute the precise size and functional requirements of the correction drill. They ensure that the correction drill can effectively cut and correct the hole wall during large-diameter drilling in bedrock, while keeping the diameter and shape of the drill hole in line with the design requirements. Through reasonable size design and material selection, the correction drill can work stably under harsh drilling conditions and improve the efficiency and success rate of drilling.

[0079] The upper cutting alloy group 4 includes a plurality of evenly arranged upper gauge alloys 5, and the upper gauge alloys 5 on adjacent upper cutting alloy groups 4 are staggered and welded on the upper spiral rib 3;

[0080] The lower cutting alloy group 9 includes a plurality of lower gauge alloys 8 that are evenly arranged, and the lower gauge alloys 8 on adjacent lower cutting alloy groups 9 are staggered and welded on the lower spiral rib 10;

[0081] The height of the upper gauge alloy 5 is 0.5 mm, and the distance between adjacent upper gauge alloys 5 on the upper cutting alloy group 4 is 30 mm;

[0082] The height of the lower gauge alloy 8 is 0.5 mm, and the distance between adjacent lower gauge alloys 8 on the lower cutting alloy group 9 is 30 mm.

[0083] Specifically, the upper cutting alloy group is composed of several particles of evenly arranged upper gauge alloy. These alloy particles are designed to maintain the diameter of the drilled hole and cut the hole wall during drilling. The upper gauge alloys on adjacent upper cutting alloy groups are fixed to the upper spiral ribs by staggered welding. This staggered arrangement helps to disperse the cutting force, reduce vibration and wear during cutting, and ensure uniform cutting effect. The height of each upper gauge alloy is 0.5mm. This height is determined based on the cutting effect and the wear resistance of the alloy material, aiming to extend the service life of the alloy while maintaining cutting efficiency. The distance between adjacent upper gauge alloys on the upper cutting alloy group is 30mm. This spacing is determined based on comprehensive consideration of factors such as the drilled hole diameter, rock hardness and drilling speed to ensure that the cutting effect covers the entire drilled hole wall while avoiding excessive wear between the alloys.

[0084] The lower cutting alloy group is similar to the upper cutting alloy group. The lower cutting alloy group is also composed of several evenly arranged lower gauge alloy particles. These alloy particles are responsible for holding and cutting the hole wall in the subsequent stages of drilling. The lower gauge alloys on the adjacent lower cutting alloy group are also fixed to the lower spiral rib by offset welding. This arrangement helps to achieve similar cutting effects and stability as the upper cutting alloy group. The height of each lower gauge alloy is also 0.5mm, which is consistent with the upper gauge alloy to ensure the coordination and consistency of the cutting effects of the upper and lower cutting alloy groups. The distance between adjacent lower gauge alloys on the lower cutting alloy group is also 30mm. This spacing setting is the same as the upper cutting alloy group, aiming to achieve uniformity and stability of cutting effects throughout the drilling process.

[0085] The upper cutting alloy group and the lower cutting alloy group ensure the cutting effect and drilling accuracy of the modified drill tool during the drilling process through the carefully designed alloy particles, welding method and size spacing. This design not only improves the drilling efficiency, but also extends the service life of the drill tool.

[0086] It is worth noting that the barrel is cylindrical in shape and made of a seamless steel pipe with a wall thickness greater than 12 mm. The outer diameter of the barrel is consistent with the outer diameter of the casing in the entry hole or is 30 mm smaller than the borehole diameter.

[0087] The diameter-protecting alloy palm is welded on the outer surface of the cylinder and arranged in a spiral shape to ensure the outer diameter of the cylinder is worn and prevent the cylinder from being worn and broken during the hole repair process to cause accidents in the hole. The thickness of the diameter-protecting alloy palm is 10mm.

[0088] The upper hole repairer body is cylindrical and 500mm long. The upper part of the upper hole repairer body is processed with API drill pipe internal thread, and the lower part of the upper hole repairer is processed with external thread connected with the internal thread of the cylinder body and reinforced and welded. The outer circle of the upper hole repairer body has upper spiral ribs. According to the diameter of the large-diameter drilling hole, the upper spiral ribs 3 are at least 6 or more (including 6), the width of the upper spiral ribs is 50-80mm, and the length is consistent with the length of the upper hole repairer body. The upper hole repairer body includes the outer diameter of the upper spiral ribs, and the outer diameter of the upper spiral ribs is less than 10mm of the drilling diameter. When the upper spiral ribs rotate, the upper cutting alloy group is welded on the force-bearing surface of the scraping hole wall. The upper cutting alloy group is arranged in a group of 5 alloys, and the cutting alloy groups on adjacent upper spiral ribs are staggered and welded on the upper spiral ribs. The total outer diameter of the upper hole repairer body, the upper spiral ribs and the upper cutting alloy group is less than 4mm of the drilling diameter. It is ensured that the upper cutting alloy group is subjected to force to cut the hole wall during the hole repair process. The outer circumferential surface of the upper spiral rib is inlaid with upper gauge alloy, which is exposed 0.5mm from the outer surface of the upper spiral rib. The upper gauge alloy is evenly arranged on the outer surface of the upper spiral rib at intervals of 30mm to ensure that the outer diameter of the upper spiral rib is not damaged or worn by the upper cutting alloy group.

[0089] The main body of the lower hole repairer is cylindrical, 500mm in length, and the inner hole diameter is 100mm smaller than the inner diameter of the cylinder. The upper part of the main body of the lower hole repairer is processed with external threads connected to the internal threads of the cylinder and reinforced by welding. The lower outer circle of the main body of the lower hole repairer is inverted at a large angle of 45° (including the lower ribs). The outer circle of the main body of the lower hole repairer includes lower spiral ribs. According to the diameter of the large-diameter drilling hole, there are at least 6 lower spiral ribs (including 6). The width of the lower spiral ribs is 50 to 80mm, and the length is consistent with the length of the main body of the lower hole repairer. The main body of the lower hole repairer includes the outer diameter of the lower spiral ribs, and the outer diameter of the lower spiral ribs is 10mm smaller than the diameter of the drilling hole. The lower cutting alloy group is welded on the stress surface of the lower spiral ribs that rotate to scrape the hole wall. The lower cutting alloy group is arranged in a group of 5 alloys, and the lower cutting alloy groups on adjacent lower spiral ribs are staggered and welded on the stress surface of the lower spiral ribs. The total outer diameter of the lower hole repairer body, the lower spiral rib and the lower cutting alloy group is less than 4mm of the drill hole diameter, ensuring that the lower cutting alloy group is subjected to force to cut the hole wall during the hole repair process. The outer circumferential surface of the lower spiral rib is inlaid with the lower diameter alloy, and the lower diameter alloy is exposed 0.5mm from the outer surface of the lower spiral rib. The lower diameter alloy group is evenly arranged on the outer surface of the lower spiral rib at intervals of 30mm, ensuring that the outer diameter of the lower spiral rib is not damaged and worn by the lower cutting oblique alloy group. The thread of the drill pipe joint is API standard, and the outer thread of the drill pipe joint is connected with the inner thread of the upper hole repairer body.

[0090] Among them, the outer diameters of the cylinder, the upper hole repairer body (including upper spiral ribs and alloys), and the lower hole repairer body (including lower spiral ribs and alloys) are all determined according to the diameter of the large-diameter bedrock borehole, and the number and width of the upper spiral ribs and the lower spiral ribs are determined according to the size of the borehole diameter. When the borehole diameter is φ500~φ600, the upper and lower spiral ribs are both set to 6, and the width of each rib is 40mm; when the borehole diameter is φ600~φ800, the upper and lower spiral ribs are both set to 8, and the width of each rib is 50mm; when the borehole diameter is φ800~φ1000, the upper and lower spiral ribs are both set to 10, and the width of each rib is 60mm.

[0091] The first measurement data is compared with the stored preset data, and whether the drilling state of the modified drilling tool is abnormal is determined according to the comparison result; if so, the modified drilling tool is corrected, including:

[0092] Analyze the deviation direction and deviation amount of the hole axis during the drilling process according to the first measurement data, determine the setting position of the correction drill according to the analysis result, and control the drilling pressure of the correction drill during the deviation correction drilling process;

[0093] wherein the current drilling pressure of the modified drilling tool is set as the initial drilling pressure;

[0094] Determine whether the initial drilling pressure is within the first constraint condition; if not, correspondingly control the drilling pressure of the correction drilling tool during the deviation correction drilling process within the first formation range;

[0095] It is determined whether the current drilling pressure of the first formation is within the second constraint condition. If not, the drilling pressure of the correction drill is controlled accordingly during the deviation correction drilling process within the second formation range.

[0096] Specifically, based on the first measurement data (including the drilling position of the correction drill, the shape of the hole wall, etc.), the system first analyzes the offset direction and offset of the hole axis during the drilling process. This is achieved by comparing the real-time measurement data with the preset ideal drilling trajectory. Based on the offset analysis results of the hole axis, the system determines the setting position to which the correction drill needs to be adjusted. This position should be able to guide the drill to continue drilling along the correct trajectory to correct the current offset. During the correction drilling process, the system needs to accurately control the drilling pressure of the correction drill. The size of the drilling pressure directly affects the cutting effect and the stability of drilling.

[0097] Meanwhile, set the current WOB of the corrective drill tool to the initial WOB, which can also be preset according to the current geological conditions and drilling requirements. The system determines whether this initial WOB is within the first constraint condition (Pa < P1 < Pb). This constraint condition is for the pressure control range of drilling in the first formation. If the initial WOB is not within the first constraint condition, the system needs to correspondingly control the WOB of the corrective drill tool within the range of the first formation. This may include increasing or decreasing the WOB to ensure that the drill tool cuts under appropriate pressure. When the corrective drill tool needs to enter the second formation, the system needs to determine again whether the current WOB is within the second constraint condition (Pc < P2 < Pd). This constraint condition is for the pressure control range of drilling in the second formation. If not, the system also needs to correspondingly control the WOB of the corrective drill tool within the range of the second formation to ensure the smooth progress of drilling.

[0098] During the entire deviation-correction drilling process, the system needs to continuously monitor the drilling state and drilling parameters (such as WOB, rotational speed, feed rate, etc.) of the corrective drill tool and perform drilling correction through the corrective drill tool with a unique structure. Once an anomaly is detected, necessary adjustments are made immediately.

[0099] The determination of the stored preset data includes the following steps:

[0100] According to the core lithology data, divide the rock facies types of the target block;

[0101] Establish the confining pressure characteristics of the static mechanical parameters of rocks with different rock facies;

[0102] Using the experimental data under different confining pressures, establish the prediction curves of the static mechanical parameters of rocks under the same confining pressure conditions for different rock facies;

[0103] Establish the relationship curve between the reservoir confining pressure and the burial depth;

[0104] Obtain the preset data of the reservoir confining pressure at different burial depths.

[0105] Specifically, through the core samples obtained by drilling and coring, after detailed petrological analysis, the characteristics such as the mineral composition, structure, and texture of the rock can be determined. According to the lithology data, the rocks in the target block are divided into different rock facies types. Rock facies refers to the aggregate of rocks with similar genetic origin, mineral composition, structure, and texture characteristics. This step is the basis for subsequent analysis. The static mechanical parameters include the compressive strength, tensile strength, elastic modulus, Poisson's ratio, etc. of the rock, which reflect the mechanical response of the rock under static loading. Confining pressure refers to the pressure exerted on the rock by the surrounding medium. The static mechanical parameters of different rock facies will vary under different confining pressures. Through experiments or numerical simulations, the relationship between these parameters and the confining pressure can be established. Among them, the static mechanical parameter data of the rock under different confining pressures are obtained through laboratory experiments (such as triaxial compression experiments).

[0106] Using experimental data, regression analysis, neural network and other mathematical methods, static mechanical parameter prediction curves of different rock phases under the same confining pressure conditions are established. These curves can predict the mechanical behavior of rocks under unknown confining pressure conditions.

[0107] Reservoir confining pressure is the pressure exerted on the rocks in the reservoir by the gravity of the overlying rock layers. Buried depth is the depth of the rock underground. Based on the principles of geomechanics and geophysical data, a relationship curve between reservoir confining pressure and burial depth can be established. This curve reflects how the reservoir confining pressure changes with the increase of burial depth.

[0108] Combining the above-established prediction curve and relationship curve, the preset data of reservoir confining pressure at different burial depths can be calculated. These data are important bases for formulating drilling plans, selecting drilling tools, and determining drilling parameters in drilling operations.

[0109] It is worth noting that, as shown in Table 1, the strength and Young's modulus of different rock phases are:

[0110] Table 1

[0111]

[0112] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A bedrock large-diameter borehole wall correction system, characterized in that: include: A modified drilling tool for performing a large-diameter drilling action on said bedrock; A spatial feedback system is used to adjust the drilling direction of the correction drill in real time according to the drilling situation to ensure the verticality of the drill hole; The spatial feedback system includes a measurement module and a correction module. The measurement module is used to obtain the drilling position of the correction drill to obtain first measurement data. The correction module compares the first measurement data with the stored preset data and determines whether the drilling state of the correction drill is abnormal according to the comparison result. If so, the correction processing is performed on the correction drill. Wherein, a first constraint condition and a second constraint condition are set for the preset data, and the first constraint condition is: a <P1<P b ; The second constraint is: P c <P2<P d ; Among them, P a represents the lower limit of pressure for controlling the drilling of the first formation, P b represents the upper limit of pressure for controlling the drilling of the first formation, P c represents the lower limit of pressure for controlling the drilling of the second formation, P d Represents the upper limit of pressure for controlling drilling in the second formation.

2. A bedrock large-diameter borehole wall correction system according to claim 1, characterized in that: Acquiring the drilling position of the modified drilling tool to obtain first measurement data includes: Collecting hole wall projection points: At the current drilling level, use a measuring device to capture and record information on at least two hole wall projection points; Establishing a first polar coordinate system: calculating a first spatial position of the hole wall imaging point in the first polar coordinate system according to the parameters of the measuring device and at least two hole wall projection points; Establishing the second polar coordinates of the borehole wall: establishing a coordinate transformation relationship between the first polar coordinates and the second polar coordinates according to the positional relationship between the measuring device and the borehole space, obtaining a second spatial position of the borehole wall imaging point in the second polar coordinates according to the first spatial position and the coordinate transformation relationship, and obtaining a spatial coordinate system of the borehole wall according to the second spatial positions of the borehole wall imaging points at at least two consecutive horizontal heights; The drilling position of the modified drilling tool in the spatial coordinate system is determined, and first measurement data of the modified drilling tool at the drilling position is obtained.

3. The bedrock large-diameter borehole wall correction system according to claim 1 is characterized in that: The correction drilling tool comprises a barrel (6), an upper drill body (2) and a lower drill body (11) arranged at the upper and lower ends of the barrel (6), and a drill pipe joint (1) connected to the upper end of the upper drill body (2); The outer periphery of the cylinder (6) is welded with a diameter-retaining alloy palm (7), and the diameter-retaining alloy palm (7) is arranged in a spiral shape; A plurality of upper spiral ribs (3) are arranged on the periphery of the upper hole repairer, and an upper cutting alloy group (4) is welded on the upper spiral ribs (3); A plurality of lower spiral ribs (10) are arranged on the periphery of the lower hole repairer, and a lower cutting alloy group (9) is welded on the lower spiral ribs (10).

4. A bedrock large-diameter borehole wall correction system according to claim 3, characterized in that: The lower end of the drill pipe joint (1) is threadedly connected to the upper end of the upper hole repairer body (2); The upper spiral ribs (3) are at least six, and the lower spiral ribs (10) are at least six; The width of the upper spiral rib (3) is 50 to 80 mm, and the width of the lower spiral rib (10) is 50 to 80 mm; The sum of the outer diameter of the upper hole repairer body (2) and the height of the upper spiral rib (3) is less than 10 mm of the borehole diameter, and the sum of the outer diameter of the lower hole repairer and the height of the lower spiral rib (10) is less than 10 mm of the borehole diameter; The sum of the outer diameter of the upper hole repairer body (2), the height of the upper spiral rib (3) and the height of the upper cutting alloy group (4) is less than 4 mm of the borehole diameter, and the sum of the outer diameter of the lower hole repairer body (11), the height of the lower spiral rib (10) and the height of the lower cutting alloy group (9) is less than 4 mm of the borehole diameter.

5. A bedrock large-diameter borehole wall correction system according to claim 4, characterized in that: The upper cutting alloy group (4) comprises a plurality of evenly arranged upper gauge alloys (5), and the upper gauge alloys (5) on adjacent upper cutting alloy groups (4) are staggered and welded on the upper spiral rib (3); The lower cutting alloy group (9) comprises a plurality of lower gauge alloys (8) arranged evenly, and the lower gauge alloys (8) on adjacent lower cutting alloy groups (9) are staggered and welded on the lower spiral rib (10); The height of the upper gauge alloy (5) is 0.5 mm, and the distance between adjacent upper gauge alloys (5) on the upper cutting alloy group (4) is 30 mm; The height of the lower gauge alloy (8) is 0.5 mm, and the distance between adjacent lower gauge alloys (8) on the lower cutting alloy group (9) is 30 mm.

6. A bedrock large-diameter borehole wall correction system according to claim 1, characterized in that: Comparing the first measurement data with the stored preset data, and judging whether the drilling state of the corrected drilling tool is abnormal according to the comparison result; If yes, the correction drilling tool is corrected, including: Analyze the deviation direction and deviation amount of the hole axis during the drilling process according to the first measurement data, determine the setting position of the correction drill according to the analysis result, and control the drilling pressure of the correction drill during the deviation correction drilling process; wherein the current drilling pressure of the modified drilling tool is set as the initial drilling pressure; Determine whether the initial drilling pressure is within the first constraint condition; if not, correspondingly control the drilling pressure of the correction drilling tool during the deviation correction drilling process within the first formation range; It is determined whether the current drilling pressure of the first formation is within the second constraint condition. If not, the drilling pressure of the correction drill is controlled accordingly during the deviation correction drilling process within the second formation range.

7. The bedrock large-diameter borehole wall correction system according to claim 1 is characterized in that: The determination of the stored preset data comprises the following steps: According to the lithology data of the core well, the rock phase types of the target block are divided; Establish the confining pressure characteristics of rock static mechanical parameters of different rock phases; Using the experimental data under different confining pressures, the prediction curve of rock static mechanical parameters under the same confining pressure conditions for different rocks is established; Establish the relationship curve between reservoir confining pressure and burial depth; Obtain preset data of reservoir confining pressure at different burial depths.

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