Well pattern for horizontal multilateral grouting

Abstract

The application provides a well arrangement method of horizontal multi-branch grouting well, comprising the following steps: obtaining a stratum dip angle and a stratum vertical depth of a stratum; obtaining a branch well structure according to the stratum dip angle; obtaining a layout mode of the branch well structure in the stratum according to the branch well structure; and obtaining a footage standard of the branch well structure according to the stratum vertical depth. In the method provided by the application, the branch well structure and the corresponding layout mode of the branch well are determined according to the stratum dip angle, so that the effective area of the branch well can be maximally used to treat the stratum. Meanwhile, the corresponding working footage standard is obtained according to different vertical depths, so that the drillability is ensured. The corresponding scheme is formed according to the dip angle and the vertical depth, so that the standardized and modularized calculation and design process is facilitated. The design scheme of the branch well can be quickly obtained only by obtaining the corresponding information, so that the engineering progress is accelerated and the work efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of mine water control technology, and in particular to a method for laying out horizontal multi-branch grouting wells. Background Technology

[0002] With the development of coal mines, complex water-bearing strata such as fissure water and fault fracture zones are increasingly found within the mines. These strata often have large water inflows, affecting the construction progress and quality of mine tunnels and even causing mine flooding accidents. To avoid the impact of water layers on the mine, pre-grouting technology is generally used to form a closed grouting curtain along the shaft. Surface horizontal multi-branch grouting wells are an important water control measure to improve the water-proofing properties of the roof and floor. Grouting is used to fill the water-conducting channels and water-retaining spaces such as fissures, faults, and karst in the roof and floor aquifers, turning them into water-proof layers or relatively water-proof layers.

[0003] However, in the existing technology, the layout of horizontal multi-branch wells is often based on experience, which makes it difficult to calculate the effective control area of ​​the grouting well and also makes cost accounting inconvenient. Summary of the Invention

[0004] This invention provides a method for laying out horizontal multi-branch grouting wells to solve the problem of difficult layout of multi-branch wells and realize modular layout of multi-branch wells.

[0005] This invention provides a method for the layout of horizontal multi-branch grouting wells, comprising the following steps:

[0006] Obtain the dip angle and vertical depth of the strata;

[0007] The branch well structure is obtained based on the formation dip angle;

[0008] Based on the branch well structure, the layout of the branch well structure within the formation is obtained;

[0009] Based on the vertical depth of the formation, the footage standard of the branch well structure is obtained.

[0010] According to the well layout method for horizontal multi-branch grouting wells provided by the present invention, the step of obtaining the branch well structure based on the formation dip angle includes:

[0011] When the formation dip angle is greater than or equal to the first dip angle value, the branch well structure is a strip-shaped branch well.

[0012] According to the well layout method for horizontal multi-branch grouting wells provided by the present invention, the step of obtaining the layout pattern of the branch well structure in the formation includes:

[0013] The strip-shaped branch wells extend from the high side of the formation to the low side of the formation, and multiple strip-shaped branch wells are provided, which are distributed sequentially from the high side of the formation to the low side of the formation.

[0014] According to the horizontal multi-branch grouting well layout method provided by the present invention, multiple strip-shaped branch wells together form an extension group, and multiple extension groups are provided, which are spaced apart along the width direction of the strip-shaped branch wells.

[0015] According to the well layout method for horizontal multi-branch grouting wells provided by the present invention, the step of obtaining the branch well structure based on the formation dip angle includes:

[0016] When the formation dip angle is less than a first dip angle value and greater than a second dip angle value, the branch well structure includes a first preset number of strip-shaped branch wells and a second preset number of feather-shaped branch wells;

[0017] Wherein, the first tilt angle value is greater than the second tilt angle value, and the first preset quantity is greater than the second preset quantity.

[0018] According to the well layout method for horizontal multi-branch grouting wells provided by the present invention, the step of obtaining the layout pattern of the branch well structure in the formation includes:

[0019] The first predetermined number of strip-shaped branch wells are all extended from the high side of the formation to the low side of the formation, and are distributed sequentially from the high side of the formation to the low side of the formation.

[0020] The feather-shaped branch wells are arranged sequentially along the width direction of the strip-shaped branch wells.

[0021] According to the well layout method for horizontal multi-branch grouting wells provided by the present invention, the step of obtaining the branch well structure based on the formation dip angle includes:

[0022] When the formation dip angle is less than the second dip angle value, the branch well structure includes a third preset number of feather-shaped branch wells and a fourth preset number of strip-shaped branch wells;

[0023] The third preset quantity is greater than the fourth preset quantity.

[0024] According to the well layout method for horizontal multi-branch grouting wells provided by the present invention, the step of obtaining the layout pattern of the branch well structure in the formation includes:

[0025] The branches of the feather-shaped branch well are arranged in a relatively staggered manner.

[0026] The well layout method for horizontal multi-branch grouting wells provided by the present invention, after the step of obtaining the footage standard of the branch well structure based on the formation vertical depth, further includes:

[0027] Based on the aforementioned drilling footage standard, the drilling workload and grouting workload are obtained.

[0028] According to the well layout method for horizontal multi-branch grouting wells provided by the present invention, after the step of obtaining the drilling work volume and grouting work volume based on the drilling footage standard, the method further includes:

[0029] Based on the drilling workload and the grouting workload, the required number and model of drilling rigs are obtained, and the construction status of the required grouting station is also obtained.

[0030] Based on the construction progress, prepare a schedule budget, a cost budget, and a project quotation.

[0031] In the horizontal multi-branch grouting well layout method provided by this invention, the vertical depth and dip angle of the formation are obtained. Based on the dip angle, the branch well structure and corresponding layout method are determined to ensure that the effective area of ​​the branch well can treat the formation to the greatest extent. At the same time, according to different vertical depths, the corresponding drilling footage standard is obtained to ensure the feasibility of drilling. The corresponding scheme is formed by the dip angle and vertical depth, which facilitates the formation of a standardized and modular calculation and design process. Only the relevant information is needed to quickly obtain the branch well design scheme, which facilitates the rapid and simultaneous progress of drilling and grouting design. Even those who are not familiar with trajectory design can get started quickly, speeding up the project progress and improving work efficiency. Attached Figure Description

[0032] 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.

[0033] Figure 1 A flowchart illustrating an embodiment of the horizontal multi-branch grouting well placement method provided by the present invention;

[0034] Figure 2 This is a plan view of the strip-shaped branched well structure.

[0035] Figure 3 A structural diagram of the first embodiment of the branch well structure provided by the present invention;

[0036] Figure 4 This is a planar structural diagram of a feather-shaped branching well.

[0037] Figure 5 A structural diagram of the second embodiment of the branch well structure provided by the present invention.

[0038] Figure 6 A structural diagram of the third embodiment of the branch well structure provided by the present invention.

[0039] Figure label:

[0040] 1. Strip-shaped branch well; 2. Feather-shaped branch well. 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] Please see Figure 1 This invention provides a method for the layout of horizontal multi-branch grouting wells, comprising the following steps:

[0043] S10. Obtain the dip angle and vertical depth of the strata;

[0044] S20. Obtain the branch well structure based on the formation dip angle;

[0045] S30. Based on the branch well structure, obtain the layout of the branch well structure within the formation;

[0046] S40. Based on the vertical depth of the formation, obtain the footage standard for the branch well structure.

[0047] In the horizontal multi-branch grouting well layout method provided by this invention, the vertical depth and dip angle of the formation are obtained. Based on the dip angle, the branch well structure and corresponding layout method are determined to ensure that the effective area of ​​the branch well can treat the formation to the greatest extent. At the same time, according to different vertical depths, the corresponding drilling footage standard is obtained to ensure the feasibility of drilling. The corresponding scheme is formed by the dip angle and vertical depth, which facilitates the formation of a standardized and modular calculation and design process. Only the relevant information is needed to quickly obtain the branch well design scheme, which facilitates the rapid and simultaneous progress of drilling and grouting design. Even those who are not familiar with trajectory design can get started quickly, speeding up the project progress and improving work efficiency.

[0048] It should be noted that you should refer to [link / reference]. Figure 2 The characteristics of the strip branch well 1 are that it extends far in the longitudinal direction, the branch distribution is greatly affected by the azimuth, and it is restricted in the lateral direction. Therefore, the control surface is mostly a narrow and long area. The horizontal section has a large footage and the control area is relatively small. However, the advantage is that the orientation begins after entering the horizontal section. The orientation work is fast in the early stage, and only the trajectory needs to be controlled in the later stage, which reduces the difficulty of on-site construction and speeds up the construction progress.

[0049] For further details, please refer to Figure 3 Step S20 includes:

[0050] S21. When the formation dip angle is greater than or equal to the first dip angle value, the branch well structure includes a strip branch well. In this embodiment, the formation dip angle is too large, and the strip branch well facilitates grouting and drilling, while avoiding excessive extension of the branch well on the plane where the formation is located, which could lead to formation failure.

[0051] It should be noted that in the embodiments provided by the present invention, the first dip angle is 10°. When the dip angle exceeds 10° in the formation, the dip direction is the length direction, and the width of the formation will be relatively narrow, which facilitates the setting of the strip branch well 1 and eliminates the need to set other forms of branch well structures.

[0052] Specifically, step S30 includes:

[0053] The strip-shaped branch wells extend from the high side of the formation to the low side, and multiple strip-shaped branch wells are arranged sequentially from the high side of the formation to the low side. In this embodiment, the strip-shaped branches facilitate effective control of the inclined formation.

[0054] Furthermore, multiple strip-shaped branch wells 1 together form an extension group, and multiple extension groups are set at intervals along the width direction of the strip-shaped branch wells 1. This is to facilitate control over the width direction of the inclined formation.

[0055] It should be noted that you should refer to [link / reference]. Figure 4 The characteristics of feather-shaped branch wells 2 are that they are widely distributed laterally in the direction of the main branch, but the extension of the main branch is limited by the branch. The main branch is relatively short, and the control surface is mostly a short and wide area. Compared with strip-shaped branch wells, there are fewer horizontal segments of footage, and a larger area can be controlled. However, the branch wells after the main eye still require a large section of directional adjustment.

[0056] On the other hand, please see Figure 5 Step S20 includes:

[0057] S22. When the formation dip angle is less than the first dip angle value and greater than the second dip angle value, the branch well structure includes a first preset number of strip branch wells and a second preset number of feather branch wells.

[0058] Among them, the first tilt angle value is greater than the second tilt angle value, and the first preset quantity is greater than the second preset quantity.

[0059] In this embodiment, when the formation dip angle is less than the first dip angle value, and when the main component is a strip-shaped branch well, a certain number of feather-shaped branches can be deployed to achieve full coverage of the formation. At the same time, due to the lateral distribution characteristics of the feather-shaped branch wells, the number of well sites can be reduced, improving work efficiency and reducing work costs.

[0060] It should be noted that in this embodiment, the first tilt angle is 10° and the second tilt angle is 5°.

[0061] Furthermore, step S30 includes:

[0062] The first predetermined number of strip-shaped branch wells are all set up to extend from the high side of the formation to the low side of the formation, and are distributed sequentially from the high side of the formation to the low side of the formation.

[0063] Feather-shaped branch wells are set sequentially along the width direction of the strip-shaped branch wells.

[0064] By interweaving the two types of branch wells, the control area of ​​the branch wells is increased, and fewer well sites are required. In this embodiment, the strip branch wells control the formation along the longitudinal direction. When the strip branch wells are laid out laterally along their width, feather branch wells are interspersed among them, which can reduce the number of wells required for lateral layout. At the same time, the staggered arrangement of the two types of wells can better control the formation.

[0065] On the other hand, please see Figure 6 Step S20 includes:

[0066] S23. When the formation dip angle is less than the second dip angle value, the branch well structure includes a third preset number of feather-shaped branch wells and a fourth preset number of strip-shaped branch wells.

[0067] The third preset quantity is greater than the fourth preset quantity.

[0068] In this embodiment, when the formation dip angle is less than the second dip angle value, the formation can be approximately considered to be horizontally extended. In this case, the feather-shaped branch wells with better lateral control force can better control the formation and control a larger area.

[0069] Specifically, step S30 includes:

[0070] The branches of the feather-shaped branch well are arranged in a relatively staggered manner.

[0071] In this embodiment, the feather-shaped branch wells are staggered, which creates a better control structure between the feather-shaped branch wells and ensures the treatment of the formation.

[0072] It should be noted that, in this embodiment, when the formation depth is greater than 400 meters and less than or equal to 600 meters, the footage standards include: 5780 meters of horizontal footage for feather-shaped branch wells, 55 meters between branches, and an actual controlled area of ​​0.3 square kilometers; and 4080 meters of horizontal footage for strip-shaped branch wells, 55 meters between branches, and an actual controlled area of ​​0.18 square kilometers.

[0073] When the vertical depth of the formation is greater than 600 meters and less than or equal to 800 meters, the horizontal section of the feather-shaped branch well has a footage of 10,400 meters, a branch spacing of 55 meters, and an actual controlled area of ​​0.6 square kilometers; the horizontal section of the strip-shaped branch well has a footage of 8,060 meters, a branch spacing of 55 meters, and an actual controlled area of ​​0.36 square kilometers.

[0074] When the vertical depth of the formation is greater than 800 meters but less than 1000 meters, the horizontal section of the feather-shaped branch well has a footage of 16450 meters, a branch spacing of 55 meters, and an actual controlled area of ​​0.98 square kilometers; the horizontal section of the strip-shaped branch well has a footage of 12390 meters, a branch spacing of 55 meters, and an actual controlled area of ​​0.54 square kilometers.

[0075] It should be noted that the vertical depth of most grouting treatment layers is between 400 and 1000 meters. Therefore, based on practicality, this invention focuses on data simulation and trajectory design for layers between 400 and 1000 meters.

[0076] After completing the initial design, step S40 also includes:

[0077] S50. Based on the drilling footage standard, obtain the drilling workload and grouting workload.

[0078] After the design is completed, the drilling and grouting workloads can be calculated based on the design to facilitate the construction team in scheduling the construction progress.

[0079] Furthermore, step S50 also includes:

[0080] S60. Based on the drilling and grouting workload, obtain the required number and model of drilling rigs, and at the same time, obtain the construction status of the required grouting station.

[0081] After clarifying the drilling rig model, number of drilling rigs, and construction status of the grouting station, the project schedule budget, cost budget, and project quotation are determined accordingly, forming a workflow that allows even those unfamiliar with trajectory design to get started quickly, accelerate project progress, and improve work efficiency.

[0082] 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 arranging horizontal multi-branch grouting wells, characterized in that, Includes the following steps: Obtain the dip angle and vertical depth of the strata; The branch well structure is obtained based on the formation dip angle; Based on the branch well structure, the layout of the branch well structure within the formation is obtained; Based on the vertical depth of the formation, the footage standard of the branch well structure is obtained; The steps for obtaining the branch well structure based on the formation dip angle include: When the formation dip angle is greater than or equal to the first dip angle value, the branch well structure is a strip-shaped branch well; When the formation dip angle is less than a first dip angle value and greater than a second dip angle value, the branch well structure includes a first preset number of strip-shaped branch wells and a second preset number of feather-shaped branch wells; Wherein, the first tilt angle value is greater than the second tilt angle value, and the first preset quantity is greater than the second preset quantity.

2. The well layout method for horizontal multi-branch grouting wells according to claim 1, characterized in that, The steps for obtaining the layout of the branch well structure within the formation include: The strip-shaped branch wells extend from the high side of the formation to the low side of the formation, and multiple strip-shaped branch wells are provided, which are distributed sequentially from the high side of the formation to the low side of the formation.

3. The well layout method for horizontal multi-branch grouting wells according to claim 2, characterized in that, Multiple strip-shaped branch wells together form an extension group, and multiple extension groups are provided, which are spaced apart along the width direction of the strip-shaped branch wells.

4. The well layout method for horizontal multi-branch grouting wells according to claim 1, characterized in that, The steps for obtaining the layout of the branch well structure within the formation include: The first predetermined number of strip-shaped branch wells are all extended from the high side of the formation to the low side of the formation, and are distributed sequentially from the high side of the formation to the low side of the formation. The feather-shaped branch wells are arranged sequentially along the width direction of the strip-shaped branch wells.

5. The well layout method for horizontal multi-branch grouting wells according to claim 1, characterized in that, The steps for obtaining the branch well structure based on the formation dip angle include: When the formation dip angle is less than the second dip angle value, the branch well structure includes a third preset number of feather-shaped branch wells and a fourth preset number of strip-shaped branch wells; The third preset quantity is greater than the fourth preset quantity.

6. The well layout method for horizontal multi-branch grouting wells according to claim 5, characterized in that, The steps for obtaining the layout of the branch well structure within the formation include: The branches of the feather-shaped branch well are arranged in a relatively staggered manner.

7. The well layout method for horizontal multi-branch grouting wells according to claim 1, characterized in that, Following the step of obtaining the footage standard of the branch well structure based on the vertical depth of the formation, the method further includes: Based on the aforementioned drilling footage standard, the drilling workload and grouting workload are obtained.

8. The well layout method for horizontal multi-branch grouting wells according to claim 7, characterized in that, After obtaining the drilling and grouting work volume based on the aforementioned drilling footage standard, the process further includes: Based on the drilling workload and the grouting workload, the required number and model of drilling rigs are obtained, and the construction status of the grouting station is also obtained.

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