A functional extension method of ordovician aquifer grouting directional drilling

Abstract

This invention provides a method for expanding the functionality of directional boreholes for grouting in Ordos limestone aquifers. The method includes acquiring and analyzing mine hydrogeological data, determining the lithological structure characteristics, sedimentary characteristics, geological structural distribution parameters, and hydrogeological parameters of the coal seam floor, constructing a stratigraphic structure model, analyzing the hydrogeological parameters based on the stratigraphic structure model to determine the treatment strata in the Ordos limestone aquifer, analyzing the geological structural distribution parameters based on the stratigraphic structure model to determine the trajectory design parameters for the directional borehole, determining the function of the directional borehole according to the project objective and pre-defined directional borehole function classification information, and designing the directional borehole corresponding to the treatment strata and / or the borehole trajectory design parameters. This method refines the functional classification of directional boreholes, provides design methods for directional boreholes with different functions, expands the functionality of directional boreholes, and makes the surface area treatment technology for Ordos limestone water hazards more comprehensive, applicable, and targeted.

Description

Technical Field

[0001] This invention relates to the field of mine water hazard prevention technology, and in particular to a method for extending the functionality of directional drilling for grouting in Ordovician limestone aquifers. Background Technology

[0002] In coal seam mining, floor water inrush is one of the most common forms of mine disaster. The threat posed by confined water in the Ordovician limestone floor to the mining of lower coal seams is increasingly serious. In mines with thin aquitards in the coal seam floor, under the combined effects of mine pressure, geological structure, and water pressure, the mining-induced damage zone, the activated zone of concealed structures, and the confined water conduction zone of the floor are prone to interconnect, causing water inrush in the mining space and posing a safety threat to mine operations.

[0003] In recent years, surface area treatment methods based on directional drilling technology have achieved good results in the control of water hazards in Ordos limestone aquifers and have been widely promoted and applied. This method involves drilling directional boreholes on the surface (boreholes with a specific azimuth, inclination, and three-dimensional coordinates, designed with a certain forward direction, and constructed to reach the target location) before grouting. Multi-branch grouting boreholes are designed at the selected treatment layer of the Ordos limestone aquifer, and a forward grouting process is used for segmented grouting to seal water-conducting fractures, increase the thickness of the bottom aquitard, and thus improve the safety factor of coal mining in confined water. However, existing grouting borehole methods for Ordos limestone aquifers only focus on the accuracy of trajectory control and the completion of subsequent grouting operations, neglecting the hydrogeological and engineering geological exploration role of directional boreholes. They fail to comprehensively design directional boreholes based on engineering objectives such as the exploration of the top boundary of the Ordos limestone aquifer, the determination of geological structures, the exploration of the thickness of the bottom aquitard in the coal seam, and local reinforcement treatment, resulting in a single function of directional boreholes. Summary of the Invention

[0004] This invention provides a method for extending the functionality of directional drilling for grouting in Ordovician limestone aquifers, thereby addressing the limitation of existing directional drilling methods that rely on a single function and enabling diversified functionality of directional drilling.

[0005] This invention provides a method for extending the functionality of directional drilling for grouting in Ordovician limestone aquifers, comprising: acquiring and analyzing mine hydrogeological data, and determining the lithological structure characteristics, sedimentary characteristics, geological structural distribution parameters, and hydrogeological parameters of the coal seam floor;

[0006] A stratigraphic structure model is constructed using the lithological and sedimentary characteristics of the base plate. Based on the stratigraphic structure model, the hydrogeological parameters are analyzed to determine the treatment layer in the Ordovician limestone aquifer. Based on the stratigraphic structure model, the geological structure distribution parameters are analyzed to determine the trajectory design parameters for directional drilling.

[0007] The drilling function of directional drilling is determined based on the project objective and the preset directional drilling function classification information. The directional drilling design corresponding to the drilling function is carried out based on the treatment layer and / or the trajectory design parameters of the borehole.

[0008] According to the present invention, a method for extending the functionality of directional drilling for grouting in Ordovician limestone aquifers is provided, wherein the preset directional drilling function classification information includes the following categories of functions:

[0009] Select the treatment layer and carry out drilling and grouting operations;

[0010] Drilling exploration of geological structures;

[0011] To identify the degree of development of karst fissures in Ordovician limestone;

[0012] Explore the top boundary of the Ordovician limestone strata;

[0013] Localized grouting can be performed to enhance the treatment effect;

[0014] The thickness and lithology of the bottom aquitard of the coal seam were investigated.

[0015] According to the present invention, a method for extending the function of directional drilling for grouting in Ordovician limestone aquifers includes designing directional drilling corresponding to the drilling function based on the treatment layer and / or the borehole trajectory design parameters, comprising:

[0016] When the drilling function is to select the treatment layer for drilling and grouting, the directional drilling adopts one or more of the following arrangement methods: comb-shaped, fan-shaped, and fishbone-shaped, and adopts the layer-by-layer arrangement method for planar design and construction. Grouting is carried out after the segmented construction is completed.

[0017] The present invention provides a functional extension method for directional drilling of grouting in Ordovician limestone aquifers, which includes drilling exploration of geological structures, including verifying geological structures indicated by geophysical exploration and determining geological structure information during the drilling process.

[0018] According to the present invention, a method for extending the function of directional drilling for grouting in Ordovician limestone aquifers includes designing directional drilling corresponding to the drilling function based on the treatment layer and / or the borehole trajectory design parameters, comprising:

[0019] When the function of the borehole is to verify the geological structure indicated by geophysical exploration, and the geological structure touches the Ordovician limestone aquifer or cuts through the injection layer of the Ordovician limestone aquifer, the secondary directional borehole is designed and constructed vertically on the main directional borehole, or the secondary directional borehole is designed and constructed in three-dimensional space at a preset angle on the main directional borehole, with the preset directional drilling technical conditions as a constraint.

[0020] When the function of the borehole is to verify the geological structure indicated by geophysical exploration, and the geological structure is located above the top boundary of the Ordovician limestone aquifer, the secondary directional borehole is designed and constructed vertically based on the preset directional drilling technical conditions.

[0021] When the drilling function is to determine geological structure information during drilling, the presence of a geological structure is determined based on hydrological logging information, drilling time logging information, cuttings logging information, and natural gamma ray logging information; wherein, determining the presence of a geological structure based on hydrological logging information, drilling time logging information, cuttings logging information, and natural gamma ray logging information includes:

[0022] When the trajectory of the directional borehole is within the treatment stratum, and there are changes in drilling fluid loss, drilling time, lithology of cuttings returned, and natural gamma ray increase compared to the previous period, it is determined that a geological structure exists.

[0023] According to the present invention, a method for extending the function of directional drilling for grouting in Ordovician limestone aquifers includes designing directional drilling corresponding to the drilling function based on the treatment layer and / or the borehole trajectory design parameters, comprising:

[0024] When the borehole's function is to identify the development level of karst fissures in Ordovician limestone, the development level of karst fissures is determined using hydrological logging information and drilling time logging information; wherein, determining the development level of karst fissures using hydrological logging information and drilling time logging information includes:

[0025] During directional drilling in the Ordovician limestone formation, the degree of development of karst fractures in the Ordovician limestone is determined based on drilling fluid loss, drilling time, formation strength, and fracture load.

[0026] According to the present invention, a method for extending the function of directional drilling for grouting in Ordovician limestone aquifers includes designing directional drilling corresponding to the drilling function based on the treatment layer and / or the borehole trajectory design parameters, comprising:

[0027] When the function of the borehole is to explore the top boundary of the Ordovician limestone strata, the secondary directional borehole is designed and constructed vertically based on the preset directional drilling technical conditions, or it is designed and constructed to cross the main directional borehole at a preset angle in a plane, or it is designed and constructed to cross the main directional borehole at a preset angle in three-dimensional space.

[0028] By acquiring cuttings logging information and natural gamma logging information during directional drilling, and considering changes in the lithology of natural gamma and cuttings return material compared to the previous period, the upper boundary of the Ordovician limestone strata was determined through comprehensive analysis.

[0029] According to the present invention, a method for extending the function of directional drilling for grouting in Ordovician limestone aquifers includes designing directional drilling corresponding to the drilling function based on the treatment layer and / or the borehole trajectory design parameters, comprising:

[0030] When the drilling function is to enhance the treatment effect through local grouting, in the block where local grouting is required, the directional drilling shall be arranged in one or more of the following ways: comb-shaped, fan-shaped, and fishbone-shaped, and the planar design and construction shall be carried out in a layer-by-layer arrangement. Grouting operation shall be carried out after the segmented construction is completed.

[0031] Alternatively, a vertical layered design can be carried out in the block where local grouting is required, dividing it into multiple layered planes. In each layered plane, directional drilling can be carried out using one or more of the following arrangements: comb-shaped, fan-shaped, and fishbone-shaped. The planar design and construction can be carried out using a layer-by-layer arrangement. Grouting operations can be carried out after the segmented construction is completed.

[0032] Alternatively, within the block where local grouting is required, the directional borehole may be designed and constructed at least once vertically, or at least once at a predetermined angle on the main directional borehole, or at least once at a predetermined angle on the main directional borehole, or at least once at a predetermined angle on the main directional borehole, and then a secondary directional borehole may be designed and constructed at a predetermined angle in three dimensions.

[0033] According to the present invention, a method for extending the function of directional drilling for grouting in Ordovician limestone aquifers includes designing directional drilling corresponding to the drilling function based on the treatment layer and / or the borehole trajectory design parameters, comprising:

[0034] When the drilling function is to explore the thickness and lithology of the aquitard layer on the bottom of the coal seam, the secondary directional drilling is designed and constructed vertically based on the preset directional drilling technical conditions. The current strata boundary is determined by combining hydrological logging information, drilling time logging information, cuttings logging information, and natural gamma logging information. Based on the drilling depth, drilling parameters, and the lithological structure characteristics of the bottom plate, the thickness of the aquitard layer between the bottom plate of the coal seam and the top boundary of the Ordovician limestone aquifer is obtained.

[0035] According to the present invention, a method for extending the function of directional drilling for grouting in Ordovician limestone aquifers, before designing the directional drilling corresponding to the drilling function based on the treatment layer and / or the borehole trajectory design parameters, further includes:

[0036] Determine the drilling time grading standards for different lithologies in the coal seam floor, the grading standards for drilling fluid loss, the natural gamma ray identification standards, and the grading standards for cuttings.

[0037] The present invention provides a method for extending the functionality of directional boreholes for grouting in Ordos limestone aquifers. This method includes acquiring and analyzing mine hydrogeological data to determine the lithological structure characteristics, sedimentary characteristics, geological structural distribution parameters, and hydrogeological parameters of the coal seam floor. A stratigraphic structure model is constructed using the floor lithological and sedimentary characteristics. Based on the stratigraphic structure model, hydrogeological parameters are analyzed to determine the treatment strata in the Ordos limestone aquifer. Based on the stratigraphic structure model, geological structural distribution parameters are analyzed to determine the trajectory design parameters for the directional borehole. The drilling function of the directional borehole is determined according to the project objective and pre-defined directional borehole functional classification information. The directional borehole design corresponding to the treatment strata and / or the borehole trajectory design parameters is then performed. Through the implementation of this method, the functional classification of directional boreholes in surface area remediation projects is refined. Simultaneously, it provides design methods for directional boreholes with different functions, expanding the functionality of directional boreholes and making the surface area remediation technology for Ordos limestone water hazards more comprehensive, applicable, and targeted. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a flowchart illustrating the functional extension method for directional drilling of grouting in Ordovician limestone aquifers provided by the present invention.

[0040] Figure 2 This is a schematic diagram of the comb-shaped well inclination, fan-shaped well inclination, and fishbone-shaped well inclination in the embodiments of the present invention. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0042] The following is combined Figures 1-2 This invention describes a method for extending the functionality of directional drilling for grouting in Ordovician limestone aquifers.

[0043] like Figure 1 As shown, the functional extension method for directional drilling of grouting in Ordovician limestone aquifers provided by the present invention includes the following steps:

[0044] S1. Obtain and analyze mine hydrogeological data to determine the lithological structure characteristics, sedimentary characteristics, geological structural distribution parameters, and hydrogeological parameters of the coal seam floor.

[0045] Among them, the lithological structure of the base plate is a geological structural model that reflects the characteristics of lithological sequence. During the sedimentary process, different lithological strata such as mudstone, sandstone, coal seam, and limestone are deposited in layers. The rock strength, permeability, and degree of fracture development of different lithologies vary.

[0046] Specifically, in this step, by analyzing the mine's hydrogeological and engineering geological data, the lithological structure characteristics and sedimentary sequence of the coal seam floor are determined, the geological structural distribution parameters indicated by geophysical exploration results are determined, and hydrogeological parameters such as the permeability coefficient and water pressure of the Ordovician limestone strata are determined. This identifies the treatment layers within the Ordovician limestone aquifer, i.e., the layers requiring grouting modification. The implementation of this step provides a reference for the directional drilling design of surface area treatment projects.

[0047] S2. Construct a stratigraphic structure model using the lithological and sedimentary characteristics of the base plate. Analyze hydrogeological parameters based on the stratigraphic structure model to determine the treatment strata in the Ordovician limestone aquifer. Analyze the geological structural distribution parameters based on the stratigraphic structure model to determine the trajectory design parameters for directional drilling.

[0048] Specifically, based on the analysis results of the mine hydrogeological data in step S1, the sedimentary characteristics and layer thickness of the floor lithology are refined to construct a stratigraphic structure model. By analyzing parameters such as water-bearing capacity, water pressure, permeability coefficient, and aquitard thickness of the Ordovician limestone strata, the treatment layers (i.e., the layers requiring grouting modification) in the Ordovician limestone aquifer are determined. The spatial distribution, dip angle, and drop parameters of the geological structure of the coal seam floor are analyzed to determine the trajectory design parameters for directional drilling.

[0049] S3. Determine the drilling function of directional drilling based on the project objective and the preset directional drilling function classification information, and design the directional drilling corresponding to the drilling function based on the treatment layer and / or the borehole trajectory design parameters.

[0050] In an optional embodiment of the present invention, before designing directional boreholes corresponding to the borehole function based on the treatment strata and / or borehole trajectory design parameters, the method further includes determining the drilling time grading standards for different lithologies in the coal seam floor, determining the grading standards for drilling fluid loss, determining the natural gamma ray discrimination standards, and determining the grading standards for cuttings. Specifically, the strength grading of different lithologies in the coal seam floor can be determined through laboratory tests, the drilling time grading of different lithologies can be determined, the drilling fluid loss grading standards for hydrological logging can be defined, the natural gamma ray discrimination standards can be determined through the natural gamma ray performance values ​​of different lithologies, and a preliminary quantitative grading standard for drilling fluid loss, drilling time, cuttings, and natural gamma ray during drilling operations can be established by combining the characteristics of cuttings from different lithologies.

[0051] The preset functional classification information for directional drilling includes various functional categories for directional drilling, as detailed below:

[0052] (1) Select the treatment layer and carry out drilling and grouting operations;

[0053] (2) Conduct drilling exploration of geological structures;

[0054] (3) Identify the degree of development of karst fissures in Ordovician limestone;

[0055] (4) Explore the top boundary of the Ordovician limestone strata;

[0056] (5) Perform localized grouting to enhance the treatment effect;

[0057] (6) Investigate the thickness and lithology of the bottom water-resistant layer of the coal seam.

[0058] It should be understood that the present invention does not limit the correspondence between engineering objectives and drilling functions, and can be determined according to the actual situation. For example, one engineering objective may correspond to one or more drilling functions.

[0059] In one optional embodiment of the present invention, the design of directional drilling is mainly divided into four categories:

[0060] The first type of design involves directional drilling using one or more of the following layout methods: comb-shaped, fan-shaped, and fishbone-shaped, combined with a bedding-following layout. The bedding-following layout follows the geological trend. Grouting is performed after each segment of construction; that is, grouting is done after the borehole has extended a certain distance, and then the next drilling and grouting operation is repeated, in a cyclical manner. The fishbone-shaped layout is further divided into fishtail-shaped and fishbody-shaped layouts.

[0061] Specifically, such as Figure 2 As shown, Figure 2Part (a) in the diagram is a schematic diagram of a comb-like arrangement of directional drilling, where boreholes are arranged at certain intervals and directions to form a layout similar to the teeth of a comb. This arrangement is suitable for boreholes that need to be parallel or nearly parallel, and can improve the uniform injection effect of grouting material. Figure 2 Part (b) in the diagram illustrates a fan-shaped arrangement of directional boreholes. This means that the directional boreholes are arranged radially in different directions from a central point, forming a fan-shaped borehole layout. This arrangement is suitable for areas requiring wider coverage, enhancing the grouting effect throughout the entire area. Figure 2 Part (c) is a schematic diagram of a fish tail-shaped arrangement, that is, the drill holes start from a central point and gradually radiate outward to form the shape of a fish tail; Figure 2 Part (d) in the diagram is a fish-shaped arrangement, which means that several parallel holes extend along a certain direction from a single borehole, forming a shape similar to a fish body.

[0062] The second type of design involves vertical directional drilling design and construction by controlling the well inclination. For example, if the original directional drilling was carried out along the trend of the rock strata, the well inclination can be adjusted to make the directional drilling deviate from the original direction, thus achieving an upward or downward deviation of the directional drilling trajectory.

[0063] The third type of design is further divided into two sub-types: a and b.

[0064] Sub-type design: A secondary directional borehole is constructed by obliquely crossing the main directional borehole at a predetermined angle. The oblique crossing design involves creating a branch directional borehole, or secondary directional borehole, vertically along the extension direction of the main directional borehole.

[0065] Subclass b design: This involves constructing secondary directional boreholes by performing a three-dimensional oblique traverse design at a preset angle along the main directional borehole. The three-dimensional oblique traverse design means constructing secondary directional boreholes along the extension direction of the main directional borehole, at any direction forming a preset angle with the main directional borehole. Examples of secondary directional boreholes are constructed along the upper left, upper right, lower left, and upper right corners of the extension direction of the main directional borehole.

[0066] The fourth type of design involves vertical layering, dividing the space into multiple layered planes. Within each layered plane, the first type of design is carried out, which involves one or more of the following arrangements: comb-shaped, fan-shaped, and fishbone-shaped. The planar design and construction of directional drilling are carried out using a layer-by-layer arrangement. Grouting is performed after the segmented construction is completed.

[0067] The drilling design corresponding to each drilling function is described in detail below:

[0068] (1) Select the treatment layer and carry out drilling and grouting operations.

[0069] The purpose of selecting a treatment layer for drilling and grouting is to fill the formation fissures with grout, thereby blocking the confined water channel or reinforcing the aquifer, thus eliminating or weakening the threat of groundwater inrush in the region and enabling safe coal mining in confined water bodies.

[0070] When selecting the treatment layer in the Ordovician limestone aquifer, directional drilling adopts the first type of design mentioned above for planar design and construction, that is, selecting one or more of the comb-shaped, fan-shaped, and fishbone-shaped layouts, and using a layer-by-layer layout for planar design and construction. Grouting is carried out after the segmented construction is completed.

[0071] (2) Drilling exploration of geological structures

[0072] Specifically, drilling exploration of geological structures is divided into two categories: ① verifying geological structures identified by geophysical exploration; ② determining geological structure information during the drilling process.

[0073] When verifying geological structures identified by geophysical exploration, the following two situations apply:

[0074] When a geological structure touches or cuts through the injection zone of an Ordovician limestone aquifer, the pre-set directional drilling technical conditions are used as a constraint (i.e., under the condition that directional technology can be realized, for example, the borehole trajectory angle cannot exceed the pre-set maximum limit). The first, second, or third design mentioned above is used to verify the distribution area of ​​the marked geological structure.

[0075] When the geological structure is located above the top boundary of the Ordovician limestone aquifer, the distribution area of ​​the marked geological structure is verified by adopting the above-mentioned second type design or the b sub-type design of the third type design, with the preset directional drilling technical conditions as a constraint.

[0076] When determining geological structure information during drilling, the presence of a geological structure is determined based on hydrological logging information, drilling time logging information, cuttings logging information, and natural gamma ray logging information. Specifically, if the trajectory of the directional borehole is within the treatment stratum, and compared to the previous period (which can be set according to actual conditions), there is an increase in drilling fluid loss, a faster drilling time, a change in the lithology of the cuttings returned, and an increase in natural gamma ray, a geological structure is comprehensively determined to exist. Similarly, during horizontal directional borehole construction, if compared to the previous period, there is an increase in drilling fluid loss, a faster drilling time, a change in the lithology of the cuttings returned, and an increase in natural gamma ray, a geological structure is comprehensively determined to exist.

[0077] (3) Identify the degree of development of karst fissures in Ordovician limestone.

[0078] During directional drilling in Ordovician limestone formations, the degree of karst fracture development in the exposed formations is primarily determined by hydrological logging information and drilling time logging information. Specifically, the degree of karst fracture development in Ordovician limestone formations is assessed based on drilling fluid loss, drilling time, Ordovician limestone formation strength, and Ordovician limestone formation fracture load.

[0079] Limestone with good integrity has low porosity, good density, high strength, and requires high fracturing load, which is reflected in the drilling process as low drilling fluid loss and long drilling time. The higher the degree of karst fissure development, the worse its density, the lower its strength, and the smaller its fracturing load, which is reflected in the drilling process as fluctuating drilling fluid loss and drilling time.

[0080] (4) Explore the top boundary of the Ordovician limestone strata

[0081] When exploring the upper boundary of the Ordovician limestone strata, the second or third type of design mentioned above is mainly used. That is, with the preset directional drilling technical conditions as constraints, the secondary directional borehole is designed and constructed vertically on the main directional borehole, or the secondary directional borehole is designed and constructed in a plane with a preset angle on the main directional borehole, or the secondary directional borehole is designed and constructed in a three-dimensional space with a preset angle on the main directional borehole.

[0082] By acquiring cuttings logging information and natural gamma logging information during directional drilling, and considering changes in the lithology of natural gamma and cuttings return material compared to the previous period, the upper boundary of the Ordovician limestone strata was determined through comprehensive analysis.

[0083] (5) Local grouting enhances the treatment effect

[0084] When the grouting treatment effect in some areas does not meet expectations, localized grouting can be performed in these areas requiring reinforcement to enhance the treatment effect. Two strategies can be adopted when performing localized grouting to enhance the treatment effect:

[0085] Strategy 1: Using the preset directional drilling technical conditions as a constraint, adopt the first type of design mentioned above, or the fourth type of design mentioned above, to design and construct one or more secondary directional boreholes on the main directional borehole.

[0086] Strategy 2: Adopt the second type of design mentioned above at least once, that is, to design and construct the directional borehole vertically at least once; or adopt the third type of design mentioned above at least once, that is, to design and construct the secondary directional borehole at a predetermined angle on the main directional borehole at least once, or to design and construct the secondary directional borehole at a predetermined angle on the main directional borehole in three-dimensional space.

[0087] (6) Investigate the thickness and lithology of the bottom aquitard of the coal seam.

[0088] When investigating the thickness of the aquitard layer and lithological structure of the coal seam floor, the second type of design mentioned above is mainly used, combined with hydrological logging information, drilling time logging information, cuttings logging information, and natural gamma logging information to determine whether the current location is a stratum interface. For example, at general stratum interfaces, due to the development of interlayer fractures, the drilling fluid loss will be greater, the cuttings return material will change, and the natural gamma will change significantly. When it is determined that a coal seam has been exposed (e.g., underground cross-layer tunneling from a rock roadway into a coal roadway), the thickness of the aquitard layer between the coal seam floor and the top boundary of the Ordovician limestone aquifer is obtained through comprehensive analysis of borehole depth, drilling parameters, and lithological structure.

[0089] In summary, the functional expansion method for directional drilling in Ordovician limestone aquifer grouting provided by this invention refines the functional classification of directional drilling in surface area remediation projects. It also provides design methods for directional drilling with different functions, expanding the capabilities of directional drilling and achieving "one borehole, multiple functions" such as exploring the top boundary of the Ordovician limestone aquifer, determining geological structures, exploring the thickness of the aquitard layer at the bottom of the coal seam, and localized enhanced remediation. This invention also proposes a method for classifying and quantitatively grading the characterization parameters of directional drilling functions. Based on different engineering objectives, the design methods and optimization schemes for directional drilling can be quickly determined, making the functionality of Ordovician limestone water hazard surface area remediation technology richer, more applicable, and more targeted.

[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 part that contributes to the prior art, can be embodied in the form of a software product. 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 device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for function extension of an Ordovician aquifer grouting directional drilling, characterized in that, include: Acquire and analyze mine hydrogeological data to determine the lithological structure characteristics, sedimentary characteristics, geological structural distribution parameters, and hydrogeological parameters of the coal seam floor; A stratigraphic structure model is constructed using the lithological and sedimentary characteristics of the base plate. Based on the stratigraphic structure model, the hydrogeological parameters are analyzed to determine the treatment layer in the Ordovician limestone aquifer. Based on the stratigraphic structure model, the geological structure distribution parameters are analyzed to determine the trajectory design parameters for directional drilling. The drilling function of directional drilling is determined based on the project objective and the preset directional drilling function classification information. The directional drilling design corresponding to the drilling function is carried out based on the treatment layer and / or the borehole trajectory design parameters. The preset directional drilling function classification information includes the following categories of functions: Select the treatment layer and carry out drilling and grouting operations; Drilling exploration of geological structures; To determine the degree of development of karst fissures in Ordovician limestone; Explore the top boundary of the Ordovician limestone strata; Localized grouting was performed to enhance the treatment effect; The thickness and lithology of the bottom aquitard of the coal seam were investigated. The directional drilling design corresponding to the drilling function, based on the treatment layer and / or the borehole trajectory design parameters, includes: When the drilling function is to select the treatment layer for drilling and grouting, the directional drilling adopts one or more of the following arrangement methods: comb-shaped, fan-shaped, and fishbone-shaped, and adopts the layer-by-layer arrangement method for planar design and construction. Grouting is carried out after the segmented construction is completed. Among them, drilling exploration of geological structures includes verifying geological structures identified by geophysical exploration and determining geological structure information during the drilling process; The directional drilling design corresponding to the drilling function, based on the treatment layer and / or the borehole trajectory design parameters, includes: When the function of the borehole is to verify the geological structure indicated by geophysical exploration, and the geological structure touches the Ordovician limestone aquifer or cuts through the injection layer of the Ordovician limestone aquifer, the secondary directional borehole is designed and constructed vertically on the main directional borehole, or the secondary directional borehole is designed and constructed in three-dimensional space at a preset angle on the main directional borehole, with the preset directional drilling technical conditions as a constraint. When the function of the borehole is to verify the geological structure indicated by geophysical exploration, and the geological structure is located above the top boundary of the Ordovician limestone aquifer, the secondary directional borehole is designed and constructed vertically in the main directional borehole, subject to the constraints of the preset directional drilling technical conditions. When the drilling function is to determine geological structure information during drilling, the presence of a geological structure is determined based on hydrological logging information, drilling time logging information, cuttings logging information, and natural gamma ray logging information; wherein, determining the presence of a geological structure based on hydrological logging information, drilling time logging information, cuttings logging information, and natural gamma ray logging information includes: When the trajectory of the directional borehole is within the treatment stratum, and there are changes in drilling fluid loss, drilling time, lithology of cuttings returned, and natural gamma ray increase compared to the previous period, it is determined that a geological structure exists.

2. The method of functional extension of the karst aquifer grouting directional drilling according to claim 1, characterized in that, Based on the treatment layer and / or borehole trajectory design parameters, directional drilling design corresponding to the borehole function is performed, including: When the borehole function is to determine the degree of development of karst fissures in Ordovician limestone, the degree of development of karst fissures is determined using hydrological logging information and drilling time logging information; wherein, determining the degree of development of karst fissures using hydrological logging information and drilling time logging information includes: During directional drilling in the Ordovician limestone formation, the degree of development of karst fractures in the Ordovician limestone is determined based on drilling fluid loss, drilling time, formation strength, and fracture load.

3. The method for extending the functionality of directional drilling for grouting in Ordovician limestone aquifers according to claim 1, characterized in that, Based on the treatment layer and / or borehole trajectory design parameters, directional drilling design corresponding to the borehole function is performed, including: When the function of the borehole is to explore the top boundary of the Ordovician limestone strata, the secondary directional borehole is designed and constructed vertically in the main directional borehole, or it is designed and constructed to cross the main directional borehole at a preset angle in a plane, or it is designed and constructed to cross the main directional borehole in three-dimensional space at a preset angle in a three-dimensional space. By acquiring cuttings logging information and natural gamma logging information during directional drilling, and considering changes in the lithology of natural gamma and cuttings return material compared to the previous period, the upper boundary of the Ordovician limestone strata was determined through comprehensive analysis.

4. The method for extending the functionality of directional drilling for grouting in Ordovician limestone aquifers according to claim 1, characterized in that, Based on the treatment layer and / or borehole trajectory design parameters, directional drilling design corresponding to the borehole function is performed, including: When the drilling function is to enhance the treatment effect through local grouting, in the block where local grouting is required, the directional drilling shall be arranged in one or more of the following ways: comb-shaped, fan-shaped, and fishbone-shaped, and the planar design and construction shall be carried out in a layer-by-layer arrangement. Grouting operation shall be carried out after the segmented construction is completed. Alternatively, a vertical layered design can be carried out in the block where local grouting is required, dividing it into multiple layered planes. In each layered plane, directional drilling can be carried out using one or more of the following arrangements: comb-shaped, fan-shaped, and fishbone-shaped. The planar design and construction can be carried out using a layer-by-layer arrangement. Grouting operations can be carried out after the segmented construction is completed. Alternatively, within the block where local grouting is required, the directional borehole may be designed and constructed at least once vertically, or at least once at a predetermined angle on the main directional borehole, or at least once at a predetermined angle on the main directional borehole, or at least once at a predetermined angle on the main directional borehole, or at least once at a predetermined angle, a secondary directional borehole may be designed and constructed for three-dimensional oblique crossing.

5. The method for extending the functionality of directional drilling for grouting in Ordovician limestone aquifers according to claim 1, characterized in that, Based on the treatment layer and / or borehole trajectory design parameters, directional drilling design corresponding to the borehole function is performed, including: When the drilling function is to explore the thickness and lithology of the aquitard layer on the bottom of the coal seam, the secondary directional drilling is designed and constructed vertically on the main directional borehole, with the preset directional drilling technical conditions as constraints. The current strata interface is determined by combining hydrological logging information, drilling time logging information, cuttings logging information and natural gamma logging information. Based on the drilling depth, drilling parameters and the lithological structure characteristics of the bottom plate, the thickness of the aquitard layer between the bottom plate of the coal seam and the top boundary of the Ordovician limestone aquifer is obtained.

6. The method for extending the functionality of directional drilling for grouting in Ordovician limestone aquifers according to any one of claims 1-5, characterized in that, Before designing the directional drilling corresponding to the drilling function based on the treatment layer and / or the borehole trajectory design parameters, the method further includes: Determine the drilling time grading standards for different lithologies in the coal seam floor, the grading standards for drilling fluid loss, the natural gamma ray identification standards, and the grading standards for cuttings.

Images