Drill hole diameter changing anti-inclination guide device for coal field geological drilling
By designing a drilling hole diameter change anti-inclination guide and alignment device for coalfield geological drilling, the problems of hole inclination and step during drilling diameter change are solved, and the drilling quality and construction efficiency are improved.
Patent Information
- Application Number
- CN202422135876.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-09-02
AI Technical Summary
During the geological drilling of coalfield fields, no anti-inclination guidance measures were taken when drilling holes were changed, which could easily cause the inclination indicators of the drilling holes to exceed the standard, the formation of steps and severe bending, affecting the drilling quality and construction progress.
A coalfield geological drilling drilling hole diameter replacement anti-oblique guide device is designed, including A pipe, B pipe, C pipe, D pipe, straightening body, guide body, cutting body and drill bit body. It is flexible combination through threaded connection to ensure that the drilling hole maintains stability during the diameter replacement process.
This device improves the anti-inclination guide and positive efficiency of drilling diameter change, avoids the over-standard hole inclination index and the formation of steps, reduces the ineffective stepping, improves the stability and construction progress of the drilling tool, and ensures drilling quality and safety in the hole.
Smart Images
Figure CN222962822U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of geological drilling, and particularly relates to a device for preventing deviation and guiding straightness during borehole diameter changing in coalfield geological drilling. Background Technique
[0002] Geological drilling is an important link in coalfield geological exploration and is also one of the most direct and effective methods for obtaining formation data. Since coalfield geology has relatively high requirements for borehole quality, the quality of boreholes directly affects the accuracy of geological data, the analysis of coal seams and structures, and the evaluation of coal reserves. In terms of the quality of coalfield geological boreholes, the problem of borehole deviation is an important index for measuring and evaluating the construction quality of boreholes.
[0003] Coalfield geology belongs to coal-bearing sedimentary strata. The geological structure is relatively complex, and the strata have characteristics such as looseness, fragmentation, and water sensitivity. Borehole construction often requires multi-stage diameters and multi-stage casing wall protection to form boreholes. The drilling methods mostly adopt small-diameter wireline drilling technology and conventional core drilling methods by lifting the drill. However, during the borehole construction process of the above drilling methods, due to the complex conditions in the borehole, it is often necessary to change the diameter multiple times and lower multi-stage casings for wall protection. However, due to reasons such as the lack of anti-deviation and straightness-guiding measures during diameter changing and the unreasonable drill string structure used, it is easy to cause the borehole deviation index to exceed the standard and form step ladders, and even cause serious bending of the borehole, which not only fails to achieve the geological purpose but also results in ineffective footage. When correcting borehole deviation, it will increase the drilling workload, delay the construction period, cause waste of manpower and material resources, and seriously affect the construction progress. This method makes it difficult to ensure the drilling quality of boreholes and the safety in the borehole. Content of the Utility Model
[0004] In view of the problems in the prior art, the utility model provides a device for preventing deviation and guiding straightness during borehole diameter changing in coalfield geological drilling. This device has beneficial effects such as a simple composition structure, flexible combination method, convenient disassembly, free combination, low processing cost, high efficiency in preventing deviation and guiding straightness during borehole diameter changing, and good effect on cutting step ladders.
[0005] To achieve the purpose of the utility model, the following technical solutions are adopted in the utility model:
[0006] A device for preventing deviation and guiding straightness during borehole diameter changing in coalfield geological drilling includes eight parts: pipe A, middle pipe B, pipe C, pipe D, a centralizer, a straightness guide, a cutting body, and a drill bit body. The upper part of pipe A is connected to the active drill rod or ordinary drill rod by a female thread, the lower part of pipe A is connected to the centralizer by a male thread, the lower part of the centralizer is connected to pipe B by a female thread, the lower part of pipe B is connected to the straightness guide by a male thread, the lower part of the straightness guide is connected to pipe C by a female thread, the lower part of pipe C is connected to the cutting body by a male thread, the lower part of the cutting body is connected to pipe D by a female thread, and the lower part of pipe D is connected to the drill bit body by a female thread.
[0007] Preferably, the A pipe, B pipe, C pipe, and D pipe are made of seamless steel pipe, with hollow internal screw threads connected, and an anti-oxidation film layer on the surface.
[0008] Preferably, the centralizer, guide body, cutting body, and drill bit body are made of metal, with hollow internal screw threads connected, and all are provided with water outlets. The cutting body is a frustum structure that is narrower at the bottom and wider at the top.
[0009] Preferably, the outer surface of the drill bit body is inlaid with strip-shaped alloys and surface-mounted diamond powder, and is provided with a water outlet.
[0010] Preferably, the outer diameters of the A pipe, B pipe, and C pipe are 77 mm, the inner diameters are 67 mm, the wall thickness is 5 mm, and the height is 1000 mm; the outer diameter of the D pipe+ is 77 mm, the inner diameter is 67 mm, the wall thickness is 5 mm, and the height is 500 mm; the outer diameters of the centralizer, guide body, and cutting body are 129 mm, the inner diameters are 67 mm, the wall thickness is 31 mm, and the height is 200 mm; the outer diameter of the drill bit body is 80 mm, the inner diameter is 48 mm, the wall thickness is 16 mm, and the height is 100 mm.
[0011] Preferably, the outer diameters of the A pipe, B pipe, and C pipe are 89 mm, the inner diameters are 78 mm, the wall thickness is 5.5 mm, and the height is 1000 mm; the outer diameter of the D pipe is 89 mm, the inner diameter is 78 mm, the wall thickness is 5.5 mm, and the height is 500 mm; the outer diameters of the centralizer, guide body, and cutting body are 152 mm, the inner diameters are 78 mm, the wall thickness is 37 mm, and the height is 200 mm; the outer diameter of the drill bit body is 100 mm, the inner diameter is 62 mm, the wall thickness is 19 mm, and the height is 100 mm.
[0012] Preferably, the drill bit body can be connected to different types of drill bits made of composite chips or diamond.
[0013] Compared with the prior art, the utility model has the following beneficial effects:
[0014] 1. Its structure design is simple, the processing cost is low, the combination method is flexible, the on-site operation is flexible, and it is relatively convenient to use.
[0015] 2. The efficiency of hole diameter changing and anti-deviation guiding for drilling is high, and the effect of cutting inclined steps is good, which can avoid the over-standard of the hole deviation index of drilling and the formation of steps.
[0016] 3. It can effectively prevent the bending of the drill hole, reduce the ineffective footage, improve the stability of the drilling tool, shorten the construction period, improve the construction progress, and ensure the drilling quality and hole safety.
[0017] 4. Improve the accuracy of coalfield drilling geological data, and promote the analysis of coal seams and geological structures and the scientific evaluation of coal reserves. Description of the Drawings
[0018] Figure 1 This is a schematic diagram of an anti-deviation and guide device for borehole diameter changing in coalfield geological drilling of the present utility model;
[0019] Figure 2 This is a schematic diagram of a cutting body of an anti-deviation and guide device for borehole diameter changing in coalfield geological drilling of the present utility model;
[0020] Figure 3 This is a schematic diagram of a guiding body of an anti-deviation and guide device for borehole diameter changing in coalfield geological drilling of the present utility model;
[0021] Figure 4 This is a schematic diagram of a centralizer of an anti-deviation and guide device for borehole diameter changing in coalfield geological drilling of the present utility model;
[0022] In the figure: bit body - 1, cutting body - 2, guiding body - 3, centralizer - 4, pipe A - 5, pipe B - 6, pipe C - 7, pipe D - 8, bit body water outlet - 9, cutting body water outlet - 10, guiding body water outlet - 11, centralizer water outlet - 12, bit matrix - 13. Specific embodiments
[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model: Specific embodiment one:
[0025] As Figures 1 - 4 shown, in a specific embodiment of the present utility model, during coalfield geological drilling, after the hole opening, in order to isolate the Quaternary surface soil layer and divert the mud, generally a 146 mm casing is first lowered as the wellhead pipe, and then a small-diameter NQ series wireline drilling tool is used for the second hole opening operation. Before the second hole opening operation, the anti-deviation and guide operation for borehole diameter changing of the present utility model is first carried out. The upper threaded female of the pipe A 5 is connected to the kelly or ordinary drill pipe, the lower threaded male of the pipe A 5 is connected to the centralizer 4, the lower threaded female of the centralizer 4 is connected to the pipe B 6, the lower threaded male of the pipe B 6 is connected to the guiding body 3, the lower threaded female of the guiding body 3 is connected to the pipe C 7, the lower threaded male of the pipe C 7 is connected to the cutting body 2, the lower threaded female of the cutting body 2 is connected to the pipe D 8, and the lower threaded female of the pipe D 8 is connected to the bit body 1. The required bit can be selected as a diamond bit or a polycrystalline diamond compact (PDC) bit according to actual needs.
[0026] Furthermore, the outer diameter of the pipe A 5, pipe B 6, and pipe C 7 is 77 mm, the inner diameter is 67 mm, the wall thickness is 5 mm, and the height is 1000 mm.
[0027] Furthermore, the outer diameter of the pipe D 8 is 77 mm, the inner diameter is 67 mm, the wall thickness is 5 mm, and the height is 500 mm.
[0028] Furthermore, the outer diameter of the body righting member 4, the body guiding member 3, and the body cutting member 2 is 129 mm, the inner diameter is 67 mm, the wall thickness is 31 mm, the height is 200 mm, and a water outlet is provided.
[0029] Furthermore, the outer diameter of the drill bit body 1 is 80 mm, the inner diameter is 48 mm, the wall thickness is 16 mm, and the height is 100 mm.
[0030] Furthermore, the drill bit body 1 can also be connected to different types of drill bits made of composite inserts or diamond. Specific Embodiment Two:
[0032] Based on Specific Embodiment One, the difference in this embodiment is that: the pipe body, the body righting member 4, the body guiding member 3, the body cutting member 2, and the drill bit body 1 are connected in another form with fixed and mutually matching dimensional specifications.
[0033] As Figures 1 - 4 shown, in a specific embodiment of the present utility model, during the coalfield geological drilling process, after the hole opening, in order to isolate the Quaternary pebble layer and meet the requirements for running the technical casing after reaming the deep aquifer, fractured zone, etc., generally, a 168-mm casing is first run as the wellhead pipe, and then a small-diameter HQ series wireline drill tool is used for the second hole opening operation. Before the second hole opening operation, the present utility model is first used for the hole diameter changing and deviation prevention guiding operation. The upper threaded female of the pipe A 5 is connected to the kelly or ordinary drill pipe, the lower threaded male of the pipe A 5 is connected to the body righting member 4, the lower threaded female of the body righting member 4 is connected to the pipe B 6, the lower threaded male of the pipe B 6 is connected to the body guiding member 3, the lower threaded female of the body guiding member 3 is connected to the pipe C 7, the lower threaded male of the pipe C 7 is connected to the body cutting member 2, the lower threaded female of the body cutting member 2 is connected to the pipe D 8, and the lower threaded female of the pipe D 8 is connected to the drill bit body 1. The required drill bit can be selected as a diamond drill bit or a composite insert drill bit according to actual needs.
[0034] Furthermore, the outer diameter of the pipe A 5, the pipe B 6, and the pipe C 7 is 89 mm, the inner diameter is 78 mm, the wall thickness is 5.5 mm, and the height is 1000 mm.
[0035] Furthermore, the outer diameter of the pipe D 8 is 89 mm, the inner diameter is 78 mm, the wall thickness is 5.5 mm, and the height is 500 mm.
[0036] Furthermore, the outer diameter of the body righting member 4, the body guiding member 3, and the body cutting member 2 is 152 mm, the inner diameter is 78 mm, the wall thickness is 37 mm, and the height is 200 mm.
[0037] Furthermore, the outer diameter of the drill bit body 1 is 100 mm, the inner diameter is 62 mm, the wall thickness is 19 mm, and the height is 100 mm.
[0038] Furthermore, according to actual needs, the drill bit body can be a diamond drill bit or a polycrystalline diamond compact (PDC) drill bit.
[0039] Furthermore, the drill bit body is also provided with a water outlet, which can be connected to different types of drill bits made of polycrystalline diamond compact or diamond.
[0040] Working principle of the device:
[0041] When drilling work is carried out, the power head of the drilling rig clamps the C pipe and connects the cutting body D pipe and the drill bit body, and drills in the overburden (A0) layer. After the power head drills to the length of the C pipe, the lower clamp clamps the C pipe. After the power head of the drilling rig releases the clamp, it rises, places the guide body and connects the B pipe. The power head clamps the B pipe and continues to drill in the late Early Pleistocene fluvial-lacustrine deposit stratum (Qp). When the drilling depth reaches the length of the B pipe, the lower clamp clamps the B pipe. After the power head of the drilling rig releases the clamp, it rises, places the centralizer and connects the A pipe. The power head clamps the A pipe and continues to drill in the Middle Pleistocene lacustrine stratum (Qp2). If drilling needs to continue after reaching the length of the A pipe, other drill pipes can be connected to continue drilling; if not, the wellhead measures can be taken.
[0042] The above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its improved concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present utility model.
Claims
1. A coalfield geological drilling borehole diameter change anti-deflection guiding device, characterized in that: include: A tube, B tube, C tube, D tube, a straightening body, a guide body, a cutting body, and a drill bit body. The upper threaded nut of the A tube is connected to an active drill rod or a common drill rod. The lower threaded male of the A tube is connected to the straightening body. The lower threaded nut of the straightening body is connected to the B tube. The lower threaded male of the B tube is connected to the guide body. The lower threaded nut of the guide body is connected to the C tube. The lower threaded male of the C tube is connected to the cutting body. The lower threaded nut of the cutting body is connected to the D tube. The lower threaded nut of the D tube is connected to the drill bit body.
2. A coalfield geological drilling borehole diameter change and anti-deflection guiding device according to claim 1, characterized in that: The A tube, B tube, C tube and D tube are made of seamless steel tubes, are connected by hollow threads inside and have an anti-oxidation film layer on the surface.
3. The coalfield geological drilling borehole diameter change and anti-deflection guiding device according to claim 1, characterized in that: The straightening body, guiding body, cutting body and drill body are all made of high-quality alloy steel and are provided with a water outlet. The internal hollow thread connects the body. The cutting body is a prism structure that is narrow at the bottom and wide at the top. The outer surface of the drill body is inlaid with strip alloy and diamond powder.
4. A coalfield geological drilling borehole diameter change and anti-deflection guiding device according to any one of claims 1 to 3, characterized in that: The outer diameters of the A tube, B tube and C tube are all 77mm, the inner diameters are all 67mm, the wall thickness is all 5mm, and the height is all 1000mm; the outer diameter of the D tube is 77mm, the inner diameter is 67mm, the wall thickness is 5mm, and the height is 500mm; the outer diameters of the straightening body, the guide body and the cutting body are all 129mm, the inner diameters are all 67mm, the wall thickness is all 31mm, and the height is all 200mm; the outer diameter of the drill body is 80mm, the inner diameter is 48mm, the wall thickness is 16mm, and the height is 100mm.
5. A coalfield geological drilling borehole diameter change and anti-deflection guiding device according to any one of claims 1 to 3, characterized in that: The outer diameters of the A tube, B tube, and C tube are all 89mm, the inner diameters are all 78mm, the wall thicknesses are all 5.5mm, and the heights are all 1000mm; the outer diameter of the D tube is 89mm, the inner diameter is 78mm, the wall thickness is 5.5mm, and the height is 500mm; the outer diameters of the straightening body, the guide body, and the cutting body are all 152mm, the inner diameters are all 78mm, the wall thicknesses are all 37mm, and the heights are all 200mm; the outer diameter of the drill body is 100mm, the inner diameter is 62mm, the wall thickness is 19mm, and the height is 100mm.
6. A coalfield geological drilling borehole diameter change and anti-deflection guiding device according to claim 1, characterized in that: The drill bit body can also be connected to different types of drill bits made of composite pieces or diamond materials.