Negative pressure power drilling tool

Abstract

The utility model is suitable for the technical field of underground well drilling, and provides a local negative pressure power drilling tool which comprises a drilling tool body, a power drilling tool body is arranged at the bottom end of the drilling tool body, a drill bit is arranged at the bottom of the drilling tool body, a drill rod is movably connected with the drilling tool body, jet holes are formed in the outer wall of the drilling tool body, and after part of circulating fluid is jetted out through the jet holes, the part of circulating fluid is injected into the drilling tool body. The jet hole is formed in the drilling tool, after gas is jetted out through the jet hole, the flow speed of the gas is higher, negative pressure is formed, the hold-down effect of the well bottom can be relieved in a rock well layer and a local negative pressure area in the drilling process, the well bottom stratum can be more easily cut by a drill bit, and the drilling efficiency is improved. Therefore, the drilling speed and efficiency are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of underground mining, and particularly relates to a negative pressure power drill. Background Art

[0002] Underground mining refers to the process of extracting ore from the ore block of an underground ore deposit, which is realized through four steps: ore deposit development, drift excavation of the ore block, cutting, and stoping. There are many classifications of underground mining methods. Commonly, based on the ground pressure control method, they are divided into three major categories: natural support mining method, artificial support mining method, and caving mining method. The underground mining system mainly includes production management, rock drilling, blasting, ore drawing, ore pass system, underground crushing, skip hoisting, and hoisting shaft sub-systems. The main steps, common methods of underground mining, and safety rules corresponding to different methods are introduced in detail; the existing power drills have low use efficiency in geological mining, thus affecting the exploration efficiency.

[0003] In order to avoid the above situation, therefore, it is necessary to design a negative pressure power drill with high use efficiency. Content of the Utility Model

[0004] The utility model provides a negative pressure power drill, aiming to solve the problem that the existing power drill has low use efficiency in geological mining, thus affecting the exploration efficiency. The utility model is realized as follows: a negative pressure power drill includes a drill: a power drill is arranged at the bottom end of the drill, and a drill bit is arranged at the bottom of the power drill.

[0005] Preferably, the drill and the power drill are movably connected. Spray holes are formed in the outer wall of the bottom of the power drill near the drill bit. The spray holes are arranged in a spiral shape, and the shape of the spray holes should be inclined upward, and there is a curvature at the bottom.

[0006] Preferably, a nozzle is formed at the bottom of the drill bit.

[0007] Compared with the prior art, the embodiments of the present application mainly have the following beneficial effects:

[0008] By forming spray holes in the power drill, after the gas is ejected through the spray holes, its flow rate is faster, forming a negative pressure, so that when mining the rock well layer, there is a tendency for the side walls at both sides of the bottom drill bit to converge, thereby improving the exploration efficiency; among them, in order to prevent the rock wall from collapsing, the pressure intensity of the gas ejected by the nozzle should be greater than the force of the rock wall collapse, and at the same time, the ejected gas can also discharge the rock debris. Description of the Drawings

[0009] Figure 1 is a structural schematic diagram of the utility model;

[0010] Figure 2 is a schematic diagram of the use effect of the utility model.

[0011] In the figure: 1. Drill string; 2. Downhole motor; 3. Injection holes; 4. Bit; 5. Nozzle. Specific embodiments

[0012] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order.

[0013] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears at various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0014] An embodiment of the present utility model provides a negative pressure downhole motor, as Figure 1-2 shown, including a drill string 1: a downhole motor 2 is provided at the bottom end of the drill string 1, and a bit 4 is provided at the bottom of the downhole motor 2;

[0015] The drill string 1 and the downhole motor 2 are movably connected. Injection holes 3 are formed in the outer wall of the bottom of the downhole motor (2) near the bit (4). The injection holes 3 are arranged in a spiral shape, and the shape of the injection holes 3 should be inclined upward, and there is a curvature at the bottom;

[0016] Nozzles 5 are formed at the bottom of the bit 4.

[0017] It should be noted that since the existing downhole motors have low use efficiency in geological exploration, the exploration efficiency is affected.

[0018] Specifically, in this embodiment, the solution mainly forms a negative pressure by opening injection holes 3 on the downhole motor 2. After the gas is ejected through the injection holes 3, its flow rate is faster, forming a negative pressure, so that in the process of drilling the rock well layer, a local negative pressure area can reduce the holding effect at the bottom of the well, making the bottom formation of the well easier to be cut by the bit, thereby improving the drilling speed and efficiency; among them, to prevent the collapse of the rock wall, the pressure intensity of the gas ejected from the nozzles 5 should be greater than the force of the rock wall collapse, and at the same time, the ejected gas can also discharge the rock cuttings.

[0019] It should be noted that for the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should be aware that the present utility model is not limited by the described action sequence, because according to the present utility model, certain steps may be adopted in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present utility model.

[0020] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the above-mentioned division of units may have other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the shown or discussed coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunications or other forms.

[0021] The units described as separate components above may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place, or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0022] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict and without creative efforts, combine, add, delete or make other adjustments to the features in the embodiments of the present utility model according to the situation, so as to obtain different technical solutions that essentially do not deviate from the concept of the present utility model, and these technical solutions also belong to the scope of protection of the present utility model.

Claims

1. A negative pressure power drilling tool, characterized in that: The invention comprises a drilling tool (1): a power drilling tool (2) is arranged at the bottom end of the drilling tool (1), a drill bit (4) is arranged at the bottom of the power drilling tool (2), and injection holes (3) are opened on the outer wall of the bottom of the power drilling tool (2) near the drill bit (4), and the injection holes (3) are arranged in a spiral shape.

2. A negative pressure power drilling tool as claimed in claim 1, characterized in that: The drilling tool (1) and the power drilling tool (2) are movably connected, and the shape of the injection hole (3) should be inclined upward and have an arc at the bottom.

3. A negative pressure power drilling tool as claimed in claim 1, characterized in that: A nozzle (5) is provided at the bottom of the drill bit (4).

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