Fishing method, treatment device and system for directional drilling shallow hole buried drill

Abstract

The present application relates to the technical field of drilling construction, and provides a fishing method, a treatment device and a system for directional drilling shallow hole buried drill, the fishing method comprising: acquiring the sticking information and the trajectory information of the drill hole; determining the to-be-loosened section of the drill hole according to the sticking information; and determining the spatial position of the to-be-loosened section according to the trajectory information; determining the construction trajectory of at least one loosening hole according to the spatial position, the construction trajectory being located on the side of the drill hole trajectory within the depth range corresponding to the to-be-loosened section, and the construction trajectories of the loosening holes being arranged at intervals with the drill hole trajectory; opening the loosening hole according to the construction trajectory, so as to loosen the rock mass around the to-be-loosened section, and pull up the buried drill rod in the drill hole. The to-be-loosened section is spatially positioned through the trajectory information of the directional drill hole, and the rock mass around the to-be-loosened section is loosened through the loosening hole arranged at intervals with the drill hole, so that the buried drill rod is fished, without the need to use a casing milling drill rod and related accessories, the fishing efficiency of the shallow hole buried drill is improved, and the device cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of drilling construction technology, and in particular to a method, processing device and system for retrieving shallow-hole buried drill bits from directional drilling. Background Technology

[0002] The statements herein are provided only as background information in connection with this application and do not necessarily constitute prior art.

[0003] During underground drilling, the borehole opening area or shallow borehole area may be composed of coal, coal gangue, or fractured rock zones formed by tunneling or mining. When drilling in such strata, the borehole wall stability is poor after drilling, and borehole wall breakage, spalling, or borehole collapse are prone to occur.

[0004] When a borehole collapses in a shallow section, the collapsed coal, rock debris, or fractured rock mass may encase or compress the drill rod inside the borehole, subjecting it to significant radial clamping force and frictional resistance, potentially leading to stuck drill bit or even burial. Continuing to drill or forcibly pull the drill bit may exacerbate the collapse, further burying the drill rod and increasing the difficulty of retrieval.

[0005] Currently, the retrieval of buried drill rods typically requires the use of specialized retrieval tools such as milling drill rods. This method necessitates not only transporting the specialized milling drill rods but also replacing related components such as drill rig slips, water pipes, tumblers, and drill bits. On-site construction takes a considerable amount of time, involves significant system adjustments, and operators may need to climb to heights for disassembly and assembly, posing safety risks such as bumps, slips, and injuries from falling parts. Summary of the Invention

[0006] This invention aims to solve at least one of the technical problems existing in related technologies. To this end, this invention proposes a method for retrieving shallow-hole buried drill bits from directional drilling, which reduces the clamping effect of rock mass on the buried drill rod, minimizes damage to the borehole, and improves the efficiency and safety of shallow-hole buried drill bit retrieval.

[0007] The present invention also proposes a processing device and a processing system for shallow hole burial drills in directional drilling.

[0008] A method for retrieving shallow-hole buried drill bits from directional drilling according to an embodiment of the present invention includes: Obtain information on stuck drill bit and trajectory information of the borehole; determine the section of the borehole to be loosened based on the stuck drill bit information; and determine the spatial position of the section to be loosened based on the trajectory information. The construction trajectory of at least one loosening hole is determined based on the spatial location. The construction trajectory is located around the borehole trajectory within the depth range corresponding to the section to be loosened, and the construction trajectory of the loosening hole is spaced apart from the borehole trajectory. The loosening hole is opened according to the construction trajectory to loosen the rock mass around the section to be loosened, and the buried drill rod in the borehole is pulled out.

[0009] According to one embodiment of the present invention, the distance between the construction trajectory of the loosening hole and the drilling trajectory is determined according to the degree of fracturing of the rock mass surrounding the section to be loosened, so as to maintain a distance between the loosening hole and the drilling hole, and to make the disturbance generated by the construction of the loosening hole act on the rock mass surrounding the section to be loosened.

[0010] According to one embodiment of the present invention, the trajectory information includes a plurality of trajectory points spaced apart along the depth direction of the borehole, and determining the spatial location of the segment to be loosened based on the trajectory information includes: The trajectory points corresponding to the segment to be loosened are obtained from the plurality of trajectory points, and the centerline of the segment to be loosened is determined based on the trajectory points corresponding to the segment to be loosened.

[0011] According to one embodiment of the present invention, after determining the centerline of the segment to be loosened based on the trajectory points corresponding to the segment to be loosened, the method further includes: Multiple first offset points are determined based on multiple trajectory points corresponding to the segment to be loosened, and the construction trajectory of the loosening hole is determined based on the multiple first offset points, wherein each first offset point is located on the periphery of the corresponding trajectory point.

[0012] According to one embodiment of the present invention, drilling another loosening hole according to the construction trajectory to loosen the rock mass surrounding the section to be loosened, and pulling out the buried drill rod in the borehole includes: After opening one of the loosening holes, the buried drill rod is pulled out to obtain the movement of the buried drill rod; Depending on the movement, either pull up the buried drill rod or continue to open the loosening hole.

[0013] According to one embodiment of the present invention, continuing to open another loosening hole includes: The range of continued loosening is determined based on the movement of the drill rod, and the range of continued loosening is at least a portion of the section to be loosened; Within the circumferential range corresponding to the continued loosening range, the angular position of the next loosening hole is determined, and the angular position of the next loosening hole is located within the maximum circumferential interval area formed by the loosening holes that have been opened.

[0014] According to one embodiment of the present invention, continuing to open another loosening hole further includes: Obtain the trajectory points corresponding to the continued loosening range from the trajectory information; Based on the angular position and the degree of fragmentation of the rock mass surrounding the continued loosening range, a second offset point corresponding to the trajectory point corresponding to the continued loosening range is determined; The construction trajectory of another loosening hole is determined based on multiple second bias points, and another loosening hole is opened according to the construction trajectory of the other loosening hole.

[0015] According to one embodiment of the present invention, the loosening hole includes an entry section and an action section. The entry section connects the opening position of the loosening hole and the action section. The action section corresponds to the section to be loosened. The distance between the entry section and the drilling trajectory is greater than the distance between the action section and the drilling trajectory.

[0016] A processing apparatus for directional drilling shallow hole buried drill according to an embodiment of the present invention includes: Information acquisition mechanism, used to acquire information about stuck drill bit and trajectory information during drilling; A processing mechanism is connected to the information acquisition mechanism. The processing mechanism is used to determine the section of the borehole to be loosened based on the stuck drill information, determine the spatial position of the section to be loosened based on the trajectory information, and determine the construction trajectory of at least one loosening hole based on the spatial position. A drilling rig is connected to the processing mechanism. The drilling rig is used to open the loosening hole according to the construction trajectory and connect to the embedded drill rod in the borehole to pull out the embedded drill rod.

[0017] The directional drilling shallow hole buried drill processing system according to an embodiment of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the aforementioned retrieval method.

[0018] The above-described one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: By acquiring information about stuck drill bits and the drill trajectory, the section to be loosened within the borehole can be identified first, and then its spatial location can be determined based on the trajectory information. Subsequently, the construction trajectory of the loosening hole is determined based on the spatial location of the section to be loosened, ensuring that the loosening hole is located around the periphery of the borehole trajectory within the depth range corresponding to the section to be loosened, and is spaced apart from the borehole trajectory. The drilling disturbance and localized pressure relief generated by the loosening hole construction loosen the surrounding rock mass, thereby reducing the force exerted by the rock mass on the buried drill pipe. This allows for the retrieval of shallow-hole buried drill pipes without relying on milling drill pipe sleeves, reducing the number of systems required and improving retrieval efficiency and operational safety.

[0019] Furthermore, the directional drilling shallow hole buried drill bit processing apparatus and directional drilling shallow hole buried drill bit processing system provided by the present invention also possess the various advantages described above, since they are used to implement the retrieval method for directional drilling shallow hole buried drill bits as described above.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention and are not considered as limitations on this application. Moreover, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0022] Figure 1 This is one of the flowcharts illustrating the retrieval method for shallow hole buried drills in directional drilling provided by the present invention.

[0023] Figure 2 This is the second flowchart illustrating the retrieval method for shallow hole buried drills using directional drilling provided by this invention.

[0024] Figure 3 This is the third flowchart of the retrieval method for shallow hole buried drills provided by the present invention.

[0025] Figure 4 This is the fourth flowchart illustrating the retrieval method for shallow hole buried drills using directional drilling provided by this invention.

[0026] Figure 5 This is the fifth flowchart illustrating the retrieval method for shallow hole buried drills using directional drilling provided by this invention.

[0027] Figure 6 This is a schematic diagram of the directional drilling processing device provided by the present invention.

[0028] Figure 7 This is a schematic diagram (I) of the angle measuring instrument in the directional drilling processing device provided by the present invention.

[0029] Figure 8 This is a schematic diagram (II) of the angle measuring instrument in the directional drilling processing device provided by the present invention.

[0030] Figure 9 This is a schematic diagram of the connection between the angle measuring instrument and the cable drill rod in the directional drilling processing device provided by the present invention.

[0031] Figure 10This is a schematic diagram of the directional drilling system provided by the present invention.

[0032] Figure label: 10: Angle measuring instrument; 101: Body; 102: Display; 103: Tilt button; 104: Azimuth button; 105: Reset button; 106: Connection terminal; 107: Signal conversion and processing component; 108: Angle signal processing component; 109: Angle measuring component; 20: Cable-through drill rod; 201: Signal cable; 1: Information acquisition agency; 2: Processing agency; 3: Drilling rig; 4: Processor; 5: Communication interface; 6: Memory; 7: Communication bus. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Features specified as "first" or "second" may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "multiple" means two or more. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified. In the description of the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, B1 and / or B2 can represent: B1 existing alone, B1 and B2 existing simultaneously, and B2 existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] The following is combined with Figures 1 to 5The present invention describes a method for retrieving shallow-hole buried drill bits from directional drilling, comprising: S100: Obtain stuck drill information and trajectory information of the borehole, determine the section of the borehole to be loosened based on the stuck drill information, and determine the spatial position of the section to be loosened based on the trajectory information; S200: Determine the construction trajectory of at least one loosening hole according to the spatial location. The construction trajectory is located on the periphery of the drilling trajectory within the depth range corresponding to the section to be loosened, and the construction trajectory of the loosening hole is spaced apart from the drilling trajectory. S300: The loosening hole is opened according to the construction trajectory to loosen the rock mass around the section to be loosened and to pull out the buried drill rod in the borehole.

[0037] During directional drilling, shallow borehole areas may contain coal or fractured rock. After borehole collapse, coal, rock debris, or fractured rock can press down on the buried drill rod, making it difficult to pull out. Directly pulling out the buried drill rod may damage it or cause the collapsed area to expand further. This embodiment addresses this by creating loosening holes around the section to be loosened, thus loosening the rock mass pressing on the buried drill rod and reducing the clamping force on it, making it easier to pull out.

[0038] By identifying the stuck section of the drill bit through drilling information, and then determining the spatial location of the section to be loosened based on the drilling trajectory information, it is possible to effectively prevent the loosening hole from deviating from the stuck position of the drill rod at the drilling depth when the drilling is directional drilling, thus ensuring that the loosening hole is set around the stuck area.

[0039] By positioning the construction trajectory of the loosening hole around the borehole trajectory within the depth range corresponding to the section to be loosened, and by setting it at intervals from the borehole trajectory, the loosening hole can both loosen the section to be loosened and avoid direct connection with the borehole, which could lead to further collapse of the surrounding rock mass. This ensures the loosening effect on the buried drill rod and guarantees the stability of the borehole.

[0040] In some embodiments, stuck drill information may include at least one of the following: hole depth location when stuck drill occurs, abnormal drilling resistance location, abnormal rotation resistance location, abnormal pull-out resistance location, abnormal pump pressure location, and abnormal slag return location. This concentrates the loosening treatment of loosening holes within the hole depth range where the drill pipe becomes stuck, ensuring that the opening of loosening holes can effectively loosen the stuck drill pipe.

[0041] For example, taking the stuck drill information as the location of abnormal drilling resistance, during the drilling process, when the drilling resistance starts to increase abnormally from a certain hole depth and becomes completely stuck at another hole depth, and the drill rod cannot continue to drill or be pulled out, the hole depth range between the abnormal starting position of the stuck drill and the completely stuck position can be determined as the section to be loosened.

[0042] In some embodiments, the distance between the construction trajectory of the loosening hole and the drilling trajectory is determined based on the degree of fracturing of the surrounding rock mass of the section to be loosened. This ensures that a distance is maintained between the loosening hole and the drilling hole, and that the disturbance generated by the loosening hole construction affects the surrounding rock mass. Determining the distance between the loosening hole and the drilling hole based on the degree of fracturing of the surrounding rock mass avoids situations where the loosening hole is too close to the drilling hole, leading to connection between them, and also avoids situations where the loosening hole is too far from the drilling hole, resulting in poor loosening effect. Therefore, the loosening hole can ensure both drilling stability and reliable disturbance to the surrounding rock mass of the section to be loosened.

[0043] In some embodiments, the distance between the construction trajectory of the loosening hole and the trajectory of the borehole can be determined based on both the anti-penetration distance and the effective disturbance distance. The anti-penetration distance represents the minimum distance required to maintain a proper separation between the loosening hole and the borehole under the current degree of rock fragmentation; the effective disturbance distance represents the maximum distance from which the disturbance generated by the loosening hole construction can act on the surrounding rock mass of the section to be loosened. The distance between the loosening hole and the borehole is greater than the anti-penetration distance but less than the effective disturbance distance. This avoids the situation where the loosening hole is too close to the borehole, leading to penetration, and also avoids the situation where the loosening hole is too far from the borehole, causing the disturbance effect to fail. Thus, the loosening hole effectively loosens the surrounding rock mass of the section to be loosened while maintaining the stability of the borehole.

[0044] Reference Figures 1-2 In some embodiments, the trajectory information includes multiple trajectory points spaced apart along the borehole depth direction. Each trajectory point may include an azimuth angle, dip angle, or spatial coordinates corresponding to the borehole depth. Determining the spatial location of the segment to be loosened based on the trajectory information includes: S110: Obtain the trajectory point corresponding to the segment to be loosened from multiple trajectory points, and determine the centerline of the segment to be loosened based on the trajectory point corresponding to the segment to be loosened.

[0045] By determining the centerline of the section to be loosened by the trajectory points corresponding to the section to be loosened, the spatial orientation of the section to be loosened can be obtained, thereby ensuring that the loosening hole can be aligned with the drill rod stuck area at the drilling depth for loosening.

[0046] like Figures 6 to 9As shown, the borehole trajectory information can be obtained through the angle measuring instrument 10. The angle measuring instrument 10 includes a body 101, on which a display 102, an inclination angle button 103, an azimuth angle button 104, and a reset button 105 are provided. The body 101 has a connecting end 106, which is used to connect to the cable drill rod 20 so that the angle measuring instrument 10 can be installed on the cable drill rod 20. Optionally, the connection between the connecting end 106 and the cable drill rod 20 can be achieved by means such as threaded engagement or snap-fit ​​engagement. The cable drill rod 20 is used to connect to the submerged drill rod. The angle measuring instrument 10 determines the trajectory information of the borehole where the submerged drill rod is located by acquiring the inclination angle and azimuth angle of the cable drill rod 20. The display 102 is used to display the inclination angle and azimuth angle. Of course, the display 102 can also be used to display the trajectory information formed based on the inclination angle and azimuth angle.

[0047] The content displayed on the monitor 102 can be switched by pressing different buttons on the motor body 101. For example, pressing the tilt button 103 can switch the content on the monitor 102 to display the tilt angle; pressing the azimuth button 104 can switch the content on the monitor 102 to display the azimuth angle; and pressing the reset button 105 can reset the current angle display content on the monitor 102.

[0048] The angle measuring instrument 10 also includes a signal conversion and processing component 107, an angle signal processing component 108, and an angle measurement component 109, all of which are housed within the body 101. The angle measurement component 109 detects the attitude changes of the cable-operated drill rod 20 and outputs angle measurement signals corresponding to the inclination and azimuth angles of the drill rod 20. The angle signal processing component 108, connected to the angle measurement component 109, processes the angle measurement signals to obtain the corresponding inclination and azimuth angles. The signal conversion and processing component 107, connected to the angle signal processing component 108, converts the inclination and azimuth angles into trajectory point data recognizable by the angle signal processing mechanism. The display 102, connected to the signal conversion and processing component 107, displays the inclination, azimuth, or trajectory point data.

[0049] Optionally, the display 102 can display trajectory point data in the form of numbers, lists, etc. For example, the display 102 can display the hole depth, inclination angle, and azimuth angle of the current trajectory point; it can also display the current trajectory point number and the corresponding angle measurement result. Thus, the operator can confirm the attitude information of the borehole at the corresponding hole depth position based on the trajectory point data displayed on the display 102, and use multiple trajectory points to determine the borehole trajectory information.

[0050] Optionally, the angle measurement component 109 may include at least one of a gyroscope, an accelerometer, and a magnetometer, and is used to acquire the attitude signal of the submerged drill pipe. The angle signal processing component 108 may include at least one of a signal conditioning circuit, a filtering circuit, and an analog-to-digital conversion circuit, and is used to process the attitude signal output by the angle measurement component 109 to obtain the tilt angle and azimuth angle. The signal conversion processing component 107 includes at least one of a level conversion circuit or a communication interface circuit, and is used to convert the tilt angle and azimuth angle into trajectory point data.

[0051] In some embodiments, a signal cable 201 is threaded through the through-drill rod 20, and the signal cable 201 is used to transmit signals. After the angle measuring instrument 10 is connected to the through-drill rod 20 through the connecting end 106, the angle measuring instrument 10 can acquire angle data when the through-drill rod 20 undergoes an attitude change, thereby obtaining drilling trajectory information.

[0052] Specifically, after each preset length of advance of the cable drill rod 20, the inclination angle and azimuth angle corresponding to that position are obtained by the angle measuring instrument 10, and the corresponding trajectory point information is obtained based on the hole depth at that position. Multiple trajectory points are distributed at intervals along the hole depth direction, and the trajectory information of the borehole can be determined by multiple trajectory points.

[0053] For example, after each drill rod length or a preset distance is advanced, the angle measuring instrument 10 acquires the inclination angle and azimuth angle at the corresponding position, and records the hole depth, inclination angle, and azimuth angle at that position as data for a trajectory point. Thus, the spatial orientation of the borehole at different hole depths can be determined based on multiple trajectory points.

[0054] Angle measuring instrument 10 is mounted on cable drill rod 20 via connecting end 106, which facilitates the acquisition of borehole trajectory information during shallow hole drilling and retrieval, improves the efficiency of determining the spatial position of the section to be loosened, and thus improves retrieval efficiency.

[0055] In some embodiments, after determining the centerline of the segment to be loosened based on the trajectory points corresponding to the segment to be loosened, the method further includes: S120: Determine multiple first offset points based on multiple trajectory points corresponding to the section to be loosened, and determine the construction trajectory of the loosening hole based on the multiple first offset points, wherein each first offset point is located on the periphery of the corresponding trajectory point.

[0056] The construction trajectory of the loosening holes is determined by multiple first offset points, so that the loosening holes are set accordingly along the spatial direction of the section to be loosened. This ensures that the loosening holes are located close to the section to be loosened at multiple depth positions, thereby improving the loosening effect of the loosening holes.

[0057] When determining the first offset points, the distance between each first offset point and its corresponding trajectory point is determined based on the degree of fracturing of the surrounding rock mass of the section to be loosened. The distance between each first offset point and its corresponding trajectory point is greater than the anti-penetration distance but less than the effective disturbance distance. Therefore, multiple first offset points ensure that the loosening holes are positioned at multiple depths corresponding to the section to be loosened, creating effective disturbance while maintaining intervals. By determining the construction trajectory of the loosening holes using multiple first offset points, a continuous and similar arrangement of the loosening holes along the spatial orientation of the section to be loosened can be achieved, thus preventing the loosening holes from deviating from the section at the drilling depth.

[0058] Reference Figures 1-3 In some embodiments, loosening holes are drilled according to the construction trajectory to loosen the rock mass surrounding the section to be loosened, and the buried drill rod in the borehole is pulled out, including: S310: After opening a loosening hole, perform a test pull on the buried drill rod to obtain the movement of the buried drill rod; S320: Depending on the movement, pull up the buried drill rod or continue to open another loosening hole.

[0059] The motion conditions can include at least one of the following: axial displacement of the submerged drill rod, angular displacement, or load change during trial extraction. When the motion conditions of the submerged drill rod meet the extraction conditions, the submerged drill rod is pulled out; when the motion conditions of the submerged drill rod meet the conditions for continuing drilling, the loosening hole is continued to be drilled.

[0060] By conducting trial pulls after each loosening hole is drilled, the next step can be determined based on the actual loosening status of the drill rod. If a loosening hole has already made the drill rod ready for pull-out, it can be pulled out directly, avoiding further disturbance caused by continuing to drill holes. If the loosening effect of one loosening hole is insufficient, more loosening holes can be drilled to further reduce the force exerted by the rock mass on the drill rod. This allows for the drilling of an appropriate number of loosening holes based on the actual situation, avoiding situations where blind drilling leads to low retrieval efficiency or increased retrieval difficulty.

[0061] Therefore, the movement of the submerged drill rod can be used to determine whether it can be pulled out directly, and also to determine whether further loosening of the section to be loosened is necessary. When the submerged drill rod exhibits axial displacement, angular displacement, or a decrease in the test pull-out load during the trial pull-out process, it indicates that the loosened hole has reduced some of the effect of the surrounding rock mass on the submerged drill rod. If the movement does not meet the conditions for pull-out, the range that needs further loosening can be determined based on the movement, thus allowing for continued loosening of the stuck area.

[0062] Reference Figures 1-4 In some embodiments, continuing to create another loosening hole includes: S321: Determine the range of continued loosening based on the movement of the drill pipe in the buried drill. The range of continued loosening shall be at least a portion of the section to be loosened. S322: Within the circumferential range corresponding to the continued loosening range, determine the angular position of the next loosening hole. The angular position of the next loosening hole is located within the maximum circumferential interval area formed by the loosening holes that have been opened.

[0063] When it is necessary to continue drilling loosening holes, the range of further loosening is determined based on the movement of the drill rod, thereby identifying the areas within the section to be loosened that require further loosening. This allows a single loosening hole to primarily target the areas of the section requiring further loosening, achieving targeted loosening.

[0064] In addition, by selecting the angle position with the largest circumferential included angle to open subsequent loosening holes, multiple loosening holes are arranged at intervals around the section to be loosened, thereby reducing the force of the rock mass on the buried drill rod at different positions in the circumference and avoiding the situation where multiple loosening holes are concentrated on the same side, causing excessive damage to the local rock mass.

[0065] The area to be loosened can be the entire section or a portion thereof. For example, when the drill rod experiences a certain axial displacement during trial extraction, but the extraction load remains large, the portion of the section to be loosened corresponding to the larger extraction resistance can be defined as the area to be loosened. Conversely, when the axial displacement of the drill rod is small or the change in the trial extraction load is small, the entire section to be loosened can be defined as the area to be loosened. By determining the area to be loosened, subsequent loosening holes can be focused on the area still requiring loosening, reducing repeated disturbance to already loosened areas.

[0066] Reference Figures 1-5 In some embodiments, continuing to create another loosening hole also includes: S323: Obtain the trajectory points corresponding to the continued loosening range from the trajectory information; S324: Based on the angular position and the degree of fragmentation of the surrounding rock mass within the continued loosening range, determine the second offset point corresponding to the trajectory point within the continued loosening range; S325: Determine the construction trajectory of another loosening hole based on multiple second offset points, and open another loosening hole according to the construction trajectory of the other loosening hole.

[0067] The second offset point is determined by identifying the trajectory points corresponding to the continued loosening range, allowing subsequent loosening holes to be aligned with the stuck area requiring further loosening. The circumferential position of the second offset point is determined by its angular location, ensuring a circumferentially spaced arrangement between subsequent loosening holes and those already drilled. The distance between the second offset point and the borehole trajectory is determined by the degree of rock fragmentation, ensuring both the spacing between subsequent loosening holes and the borehole itself, and also disturbing the rock mass surrounding the section to be loosened. Therefore, the location and construction trajectory of the next loosening hole are redefined based on the trial extraction results, the continued loosening range, and the circumferential angular position, thereby improving the loosening effect of subsequent holes and increasing retrieval efficiency.

[0068] When one loosening hole has been created, subsequent loosening holes are preferably located in the circumferential position opposite to the existing loosening hole. When two loosening holes have been created, subsequent loosening holes are preferably located in the area of ​​the maximum circumferential interval between the two existing loosening holes. When three loosening holes have been created, subsequent loosening holes are preferably located in the area of ​​the remaining maximum circumferential interval.

[0069] For example, when two loosening holes are provided, they are located on opposite radial sides of the borehole. When multiple loosening holes are provided, for ease of description, on an axial section perpendicular to the borehole, the first loosening hole can be located at an interval on the left side of the borehole, the second at an interval on the right side, the third at an interval on the upper side, the fourth at an interval on the lower side, and so on. This allows multiple loosening holes to be progressively distributed around the section to be loosened, thereby reducing the force of the rock mass on the drill string from different circumferential positions and preventing excessive local rock damage caused by multiple loosening holes concentrated on the same side.

[0070] When determining the second offset point, the distance between the second offset point and the corresponding trajectory point is also determined based on the degree of fragmentation of the surrounding rock mass within the continued loosening range. The distance between the second offset point and the corresponding trajectory point is greater than the anti-penetration distance and less than the effective disturbance distance. Therefore, subsequent loosening holes can still maintain a distance from the borehole within the continued loosening range, and the construction disturbance can still affect the surrounding rock mass within the continued loosening range. Thus, the second offset point is re-determined based on the movement after the trial extraction, the continued loosening range, and the angular position corresponding to the maximum circumferential angle. Therefore, subsequent loosening holes are not a repetition of the construction trajectory of the previous loosening hole, but rather an adaptive determination for areas that still need loosening after the trial extraction.

[0071] In some embodiments, the construction trajectory of the loosening hole includes an entry section and an action section. The entry section connects the opening position of the loosening hole and the action section, and the action section corresponds to the section to be loosened. The distance between the entry section and the borehole trajectory is greater than the distance between the action section and the borehole trajectory. The entry section is used to guide the loosening hole to the vicinity of the section to be loosened, and the action section is used to loosen the rock mass surrounding the section to be loosened. By setting the action section closer to the borehole trajectory than the entry section, during the opening of the loosening hole, the action section can have a more significant loosening effect on the rock mass surrounding the section to be loosened, while the entry section will not have a significant impact on the rock mass surrounding the borehole.

[0072] This allows the loosening hole to be positioned close to the drilling trajectory of the corresponding section to be loosened, concentrating the disturbance effect of the loosening hole around the section to be loosened, reducing the disturbance of the loosening hole to other parts of the borehole, and ensuring the safety of other parts of the borehole.

[0073] In some embodiments, when multiple loosening holes need to be sequentially opened, the multiple loosening holes may include at least two of a first loosening hole, a second loosening hole, a third loosening hole, and a fourth loosening hole. The second loosening hole is disposed opposite to the first loosening hole on the periphery of the section to be loosened, the third loosening hole is located in the circumferential interval region between the first and second loosening holes, and the fourth loosening hole is disposed opposite to the third loosening hole on the periphery of the section to be loosened. By sequentially opening the loosening holes in the above order, the multiple loosening holes are gradually distributed at different angular positions on the periphery of the section to be loosened, thereby gradually expanding the loosening coverage area around the section to be loosened.

[0074] Optionally, multiple loosening holes each have a corresponding action segment for the section to be loosened. These action segments are distributed at different angular positions around the perimeter of the borehole trajectory and correspond to different sections of the section to be loosened in the depth direction of the borehole. By distributing the multiple action segments at different angular positions, the force exerted by the rock mass on the buried drill pipe is reduced from multiple directions. By positioning the multiple action segments in the depth direction to correspond to different sections of the section to be loosened, and thus to different depth regions of the section to be loosened, it is ensured that all areas of the section to be loosened are loosened.

[0075] The arrangement of each action segment is determined based on the movement of the drill rod after each loosening hole is opened and the drill rod is test-pulled out. If a previous loosening hole has loosened part of the rock mass in the section to be loosened, but the drill rod has not yet reached the conditions for extraction, the action segment of the next loosening hole can correspond to the area in the section that still needs to be loosened. In this way, multiple action segments can be formed step by step according to the actual loosening effect, without repeatedly disturbing the same depth area.

[0076] Furthermore, two adjacent working sections in a multi-section drilling process can partially overlap in the depth direction. This partial overlap creates a continuous loosening zone between adjacent sections, preventing unloosened gaps between them. Simultaneously, because the overlap is only partial, not complete, it avoids repeated disturbance from multiple loosening boreholes at the same depth, reducing the risk of excessive local rock mass damage. It should be noted that "adjacent working sections" can refer to two sections with adjacent drilling sequences.

[0077] In some embodiments, when the movement of the submerged drill rod meets the extraction conditions, the submerged drill rod is extracted. This includes rotating the submerged drill rod at low speed or performing short-stroke reciprocating extraction before finally extracting it. By rotating at low speed and performing short-stroke reciprocating extraction, relative movement is generated between the submerged drill rod and the loosened rock mass, thereby reducing the force exerted by the rock mass on the submerged drill rod and minimizing the risk of damage to the drill rod due to direct extraction.

[0078] In some embodiments, the loosening hole is created using a drilling rig used for borehole construction. After the loosening hole is created, the embedded drill rod inside the borehole is connected to the same drilling rig to pull it out. By completing the borehole creation, loosening hole creation, and embedded drill rod extraction all using the same drilling rig, the need for replacing accessories such as milling drill rods, special slips, tailpipes, and water supply pipelines is reduced. This reduces system deployment time, lowers the safety risks associated with personnel disassembling and assembling the system, and improves on-site salvage efficiency.

[0079] In summary, the retrieval method for shallow-hole buried drill rods provided by this invention determines the section to be loosened through stuck drill information, then determines the spatial location of the section to be loosened through trajectory information, and finally determines the offset point and the construction trajectory of the loosening hole based on the trajectory points of the section to be loosened. The loosening hole maintains a certain distance from the borehole while effectively disturbing the surrounding rock mass of the section to be loosened. After opening a loosening hole, the movement of the buried drill rod is obtained through trial pulling, and the decision to continue drilling and the extent of further loosening is determined based on this movement. When drilling continues, the angular position of subsequent loosening holes is determined by the maximum circumferential angle, and the construction trajectory of subsequent loosening holes is determined by the second offset point. This method can reduce excessive damage to the surrounding rock mass while gradually reducing the force exerted by the rock mass on the buried drill rod. It enables the retrieval of shallow-hole buried drill rods without relying on milling drill rods, reducing the number of system components used and improving retrieval efficiency and operational safety.

[0080] Reference Figures 6-9As shown, the present invention also provides a processing device for shallow hole directional drilling, including an information acquisition mechanism 1, a processing mechanism 2, and a drilling rig 3. The information acquisition mechanism 1 is used to acquire stuck drill information and trajectory information of the borehole; the processing mechanism 2 is connected to the information acquisition mechanism 1, and is used to determine the section of the borehole to be loosened based on the stuck drill information, determine the spatial position of the section to be loosened based on the trajectory information, and determine the construction trajectory of at least one loosening hole based on the spatial position; the drilling rig 3 is connected to the processing mechanism 2, and is used to open loosening holes according to the construction trajectory and connect them to the buried drill rod in the borehole to pull out the buried drill rod.

[0081] In some embodiments, the information acquisition mechanism 1 includes an angle measuring instrument 10, which includes a body 101. The body 101 is equipped with a display 102, an inclination angle button 103, an azimuth angle button 104, and a reset button 105. The body 101 has a connection end 106 for connecting to a cable-operated drill rod 20, so that the angle measuring device is mounted on the cable-operated drill rod 20. The angle measuring instrument 10 is used to acquire the inclination angle and azimuth angle of the cable-operated drill rod 20, and to form borehole trajectory information based on the inclination angle and azimuth angle.

[0082] A signal cable 201 is threaded through the drill rod 20, and the signal cable 201 is used to transmit signals. After the angle measuring instrument 10 is connected to the drill rod 20 through the connecting end 106, the angle measuring instrument 10 can acquire angle data when the drill rod 20 changes its attitude, thereby obtaining drilling trajectory information.

[0083] Figure 10 An example of a processing system for shallow-hole directional drilling is provided. This system may include: a processor 4, a communication interface 5, a memory 6, and a communication bus 7. The processor 4, communication interface 5, and memory 6 communicate with each other via the communication bus 7. The processor 4 can invoke logical instructions stored in the memory 6 to execute the retrieval method for shallow-hole directional drilling described in any of the above embodiments, or to control the drilling rig 3 to execute the retrieval method for shallow-hole directional drilling described in any of the above embodiments.

[0084] Furthermore, the logical instructions in the aforementioned memory 6 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to related technologies, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer system (which may be a personal computer, server, or network system, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0085] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the retrieval method for shallow borehole directional drilling provided by the above methods. The method includes: acquiring stuck drill information and trajectory information of the borehole; determining the section of the borehole to be loosened based on the stuck drill information; determining the spatial location of the section to be loosened based on the trajectory information; determining the construction trajectory of at least one loosening hole based on the spatial location, wherein the construction trajectory is located around the borehole trajectory within the depth range corresponding to the section to be loosened, and the construction trajectory of the loosening hole is spaced apart from the borehole trajectory; and opening a loosening hole according to the construction trajectory to loosen the rock mass around the section to be loosened, thereby pulling out the buried drill rod in the borehole.

[0086] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements a method for retrieving shallow-hole buried drill bits from directional drilling provided by the methods described above. The method includes: acquiring stuck drill bit information and trajectory information of the borehole; determining the section of the borehole to be loosened based on the stuck drill bit information; determining the spatial location of the section to be loosened based on the trajectory information; determining the construction trajectory of at least one loosening hole based on the spatial location, wherein the construction trajectory is located around the borehole trajectory within the depth range corresponding to the section to be loosened, and the construction trajectory of the loosening hole is spaced apart from the borehole trajectory; and opening a loosening hole according to the construction trajectory to loosen the rock mass around the section to be loosened, thereby pulling out the buried drill bit in the borehole.

[0087] It should be noted that this embodiment does not impose specific restrictions on the connection method between the drill rods during the drilling process, the specific position of the cable-operated drill rod within the drill rod, or the installation position of the angle measuring instrument. The drill rod may include a submerged drill rod and multiple drill rod segments directly or indirectly connected to it. The cable-operated drill rod can be any drill rod segment or a measuring drill rod segment connected to the drill rod. The angle measuring instrument can be installed at the borehole end, exposed end, or other convenient position for measuring the attitude of the drill rod assembly, so as to obtain the inclination angle and azimuth angle of the submerged drill rod and to determine the borehole trajectory information.

[0088] Furthermore, the specific methods for acquiring, converting, and determining signals and data in this embodiment are all conventional technical means that can be selected and implemented by those skilled in the art according to actual needs, and this embodiment does not impose specific limitations on them.

[0089] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0090] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of software products. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer system (which may be a personal computer, server, or network system, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0091] Finally, it should be noted that the above embodiments are only for illustrating the present invention and not for limiting the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be covered within the scope of the claims of the present invention.

Claims

1. A method for retrieving shallow-hole burial drill bits from directional drilling, characterized in that, include: Obtain information on stuck drill bit and trajectory information of the borehole; determine the section of the borehole to be loosened based on the stuck drill bit information; and determine the spatial position of the section to be loosened based on the trajectory information. The construction trajectory of at least one loosening hole is determined based on the spatial location. The construction trajectory is located around the borehole trajectory within the depth range corresponding to the section to be loosened, and the construction trajectory of the loosening hole is spaced apart from the borehole trajectory. The loosening hole is opened according to the construction trajectory to loosen the rock mass around the section to be loosened, and the buried drill rod in the borehole is pulled out.

2. The retrieval method for shallow hole buried drill bits in directional drilling according to claim 1, characterized in that, The distance between the construction trajectory of the loosening hole and the drilling trajectory is determined according to the degree of fracturing of the rock mass surrounding the section to be loosened, so as to maintain a distance between the loosening hole and the drilling hole, and to make the disturbance generated by the construction of the loosening hole affect the rock mass surrounding the section to be loosened.

3. The retrieval method for shallow hole buried drill bits in directional drilling according to claim 1, characterized in that, The trajectory information includes multiple trajectory points spaced apart along the depth direction of the borehole. Determining the spatial location of the section to be loosened based on the trajectory information includes: The trajectory points corresponding to the segment to be loosened are obtained from the plurality of trajectory points, and the centerline of the segment to be loosened is determined based on the trajectory points corresponding to the segment to be loosened.

4. The retrieval method for shallow hole buried drill bits in directional drilling according to claim 3, characterized in that, After determining the centerline of the segment to be loosened based on the trajectory points corresponding to the segment to be loosened, the method further includes: Multiple first offset points are determined based on multiple trajectory points corresponding to the segment to be loosened, and the construction trajectory of the loosening hole is determined based on the multiple first offset points, wherein each first offset point is located on the periphery of the corresponding trajectory point.

5. The retrieval method for shallow hole buried drill bits in directional drilling according to claim 1, characterized in that, The loosening hole is drilled according to the construction trajectory to loosen the rock mass around the section to be loosened. Pulling out the buried drill rod in the borehole includes: After opening one of the loosening holes, the buried drill rod is pulled out to obtain the movement of the buried drill rod; Depending on the movement, either pull up the buried drill rod or continue to open another loosening hole.

6. The retrieval method for shallow hole buried drill bits in directional drilling according to claim 5, characterized in that, To continue creating another loosening hole, the following methods are employed: The range of continued loosening is determined based on the movement of the drill rod, and the range of continued loosening is at least a portion of the section to be loosened; Within the circumferential range corresponding to the continued loosening range, the angular position of the next loosening hole is determined, and the angular position of the next loosening hole is located within the maximum circumferential interval area formed by the loosening holes that have been opened.

7. The retrieval method for shallow hole buried drill bits in directional drilling according to claim 6, characterized in that, Continuing to open another loosening hole also includes: Obtain the trajectory points corresponding to the continued loosening range from the trajectory information; Based on the angular position and the degree of fragmentation of the rock mass surrounding the continued loosening range, a second offset point corresponding to the trajectory point corresponding to the continued loosening range is determined; The construction trajectory of another loosening hole is determined based on multiple second bias points, and another loosening hole is opened according to the construction trajectory of the other loosening hole.

8. The method for retrieving shallow-hole buried drill bits from directional drilling according to any one of claims 1-7, characterized in that, The construction trajectory of the loosening hole includes an entry section and an action section. The entry section connects the opening position of the loosening hole and the action section. The action section corresponds to the section to be loosened. The distance between the entry section and the drilling trajectory is greater than the distance between the action section and the drilling trajectory.

9. A processing device for shallow hole buried drill bits in directional drilling, characterized in that, include: Information acquisition mechanism, used to acquire information about stuck drill bit and trajectory information during drilling; A processing mechanism is connected to the information acquisition mechanism. The processing mechanism is used to determine the section of the borehole to be loosened based on the stuck drill information, determine the spatial position of the section to be loosened based on the trajectory information, and determine the construction trajectory of at least one loosening hole based on the spatial position. A drilling rig is connected to the processing mechanism. The drilling rig is used to open the loosening hole according to the construction trajectory and connect to the embedded drill rod in the borehole to pull out the embedded drill rod.

10. A processing system for directional drilling shallow hole buried drill bits, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the salvage method according to any one of claims 1 to 8.

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