Drilling tool for small fault detection drilling

Abstract

The utility model relates to the technical field of coal seam detection, in particular to a drilling tool for small fault detection drilling. Comprising a drill bit, a plurality of drill rods, an early warning short section and an expansion short section. The plurality of drill rods are detachably connected in sequence; the early warning short section and the bulging short section are detachably connected between any two adjacent drill rods; the early warning short section comprises a second drill rod body and an early warning device; the early warning device is mounted on the second drill rod body; the expansion short section comprises a third drill rod body; the outer wall ring of the third drill rod body is sleeved with a flexible capsule; a pressure hole is formed in the flexible capsule, a through hole is formed in the outer wall of the third drill rod body, a clamping cap is hinged to the through hole, and the clamping cap blocks the through hole and the pressure hole of the third drill rod body; the problems that an existing drilling tool cannot meet the requirement for small fault detection drilling, and early warning and blocking of harmful gas in fault drilling cannot be completed are solved.

Description

TECHNICAL FIELD

[0001] The utility model discloses coal seam detection technical field, specifically a small fault detection drilling drilling rig. BACKGROUND

[0002] Under the geological structure effect, the coal seam often develops structural bodies such as fault, collapse column, fold, and the small fault with the fall of several meters to ten meters is also generally developed. The development of small fault in the coal seam constitutes a serious threat to the mining efficiency, safety and gas management of the coal mine, and the advanced detection and exposure of small fault are very important. The advanced detection means of small fault mainly include seismic method, geophysical prospecting and drilling. The seismic method is expensive, the geophysical prospecting has the multi-solution and the precision is relatively low, and the drilling can improve the small fault detection precision and can provide direct geological information. The drill cuttings or core samples obtained through the drilling can directly observe the existence and nature of the fault. Therefore, for the small fault that is difficult to identify by the seismic and geophysical prospecting methods, the drilling provides a more accurate detection means.

[0003] The formation of small fault can destroy the integrity of the coal seam, extrude and rub the coal body in the fault zone, form tectonic coal and provide the basis for storing a large amount of gas. The fault structure changes the distribution of ground stress, the occurrence of gas and the structure of coal seam, and directly controls the occurrence of coal and gas outburst. If the gas enrichment caused by small fault cannot be predicted in real time during the drilling process, the risk of gas overrun and even coal and gas outburst will be caused. The ordinary drilling tool can only complete the basic drilling task and cannot meet the needs of small fault detection drilling, and cannot complete the early warning and plugging of harmful gas in the fault drilling, which has certain safety hazards. UTILITY MODEL CONTENTS

[0004] The utility model overcomes the insufficient of prior art, proposes a kind of small fault detection drilling drilling rig;Solve the problem that existing drilling tool cannot meet the needs of small fault detection drilling, cannot complete the early warning and plugging of harmful gas in the fault drilling.

[0005] In order to achieve the above purpose, the utility model is realized by the following technical scheme:

[0006] A kind of small fault detection drilling drilling rig, including drill bit, multiple drill rods, early warning sub, inflation sub;Multiple drill rods are detachably connected according to the length of drilling process, and drill bit is connected at the front end of multiple drill rods;Early warning sub and inflation sub are detachably connected between any two adjacent drill rods;

[0007] The early warning short section comprises a second drill rod body and an early warning device; the early warning device is installed on the second drill rod body; the inflation short section comprises a third drill rod body, a flexible capsule and a cap; the middle part of the outer wall of the third drill rod body is recessed, and the flexible capsule is sleeved on the recessed part; the flexible capsule is provided with a pressure hole, the rigid outer wall of the third drill rod body is provided with a through hole, and the cap is hinged on the through hole; in the forward rotation state of the third drill rod body, the cap is blocked at the through hole and the pressure hole of the third drill rod body; when the third drill rod body is adjusted from the forward rotation to the reverse rotation, the cap is dislocated from the pressure hole, and the pressure hole is opened.

[0008] The second drill rod body, the third drill rod body and the drill rod are hollow structures.

[0009] Further, the drill bit comprises a drill bit body, the tail part of the drill bit body is provided with a threaded female head, and the two ends of the drill rod, the early warning short section and the inflation short section are all provided with a threaded male head at one end and a threaded female head at the other end.

[0010] Further, the tail surface of the drill bit body is provided with a clamping head; the surface of the end with the threaded male head of the drill rod, the early warning short section and the inflation short section is provided with a clamping tape, and the surface of the end with the threaded female head is provided with a clamping head.

[0011] Further, the early warning device is a gas sensor.

[0012] Further, the early warning short section is located between the drill bit and the inflation short section.

[0013] Further, the early warning device is installed on the surface or the inside of the second drill rod body.

[0014] Further, the diameters of the two ends of the second drill rod body, the drill rod and the third drill rod body are all equal.

[0015] The present application has the following beneficial effects compared with the prior art:

[0016] Compared with the ordinary drill, the drill can connect the early warning short section and the inflation short section at any part of the drill through the short section mode, so that the position of the small fault can be determined in the small fault detection, and the diffusion of the harmful gas such as gas or carbon dioxide caused by the small fault can be warned and blocked in advance. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the drill for small fault detection drilling into the small fault position according to the present application;

[0018] Figure 2 is a structural schematic diagram of the drill for small fault detection drilling according to the present application;

[0019] Figure 3 is a structural schematic view of the drill bit of the present application;

[0020] Figure 4 is a structural schematic view of the drill rod of the present application;

[0021] Figure 5 is a structural schematic view of the early warning sub of the present application;

[0022] Figure 6 is a forward rotation schematic view of the bulging sub of the present application;

[0023] Figure 7 is a reverse rotation schematic view of the bulging sub of the present application.

[0024] Reference signs:

[0025] 1, drill bit body; 2, chuck; 3, clamping belt; 4, male thread; 5, first drill rod body; 6, early warning device; 7, flexible capsule; 8, cap; 9, pressure hole; 11, second drill rod body; 12, third drill rod body. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear and explicit, the present application is further described in detail in combination with the embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. The technical solutions of the present application are described in detail below in combination with the embodiments and drawings, but the protection scope is not limited thereby.

[0027] Referring to Figures 1 to 7 , the present embodiment proposes a drilling tool for small fault detection drilling, which comprises a drill bit, a drill rod, an early warning sub and a bulging sub. The number of drill rods is not limited and they can be connected with each other or with other components, so as to increase the drilling footage by increasing the length of the drilling tool during drilling. Each component of the drilling tool is a hollow structure, and water or air is used as the circulating medium. The tail of each component is internally threaded.

[0028] Specifically, the drill bit comprises a drill bit body 1. The front part of the drill bit body 1 faces the drilling direction, and the tail part can be connected with the drill rod, the early warning sub or the bulging sub. The connection mode is threaded connection combined with buckle connection. The tail part is internally threaded, and a chuck 2 is fixed to the surface thereof. The chuck 2 is a component of the buckle and is fixed to the surface of the tail part of the drill rod, the early warning sub or the bulging sub connected to the rear part. The chuck 2 and the clamping belt 3 on the drill rod, the early warning sub or the bulging sub together form a buckle, which plays a locking role, thereby avoiding rotation loosening of the two ends of the threaded connection.

[0029] Specifically, the drill rod comprises a clamping band 3, a threaded male head 4, and a first drill rod body 5; the clamping band 3 is a component part of a buckle, and is fixed at the head of the drill rod or the early warning sub or the inflatable sub, and cooperates with the clamping head 2 to form the buckle.

[0030] The threaded male head 4 is a head structure of the drill rod, the early warning sub, and the inflatable sub, and can be connected with the threaded female head of the drill bit body 1, the subsequent drill rod, the early warning sub, or the inflatable sub, thereby playing a connecting role.

[0031] The first drill rod body 5 is a rigid structure, and can be made into different lengths according to needs; the head of the first drill rod body 5 is provided with the clamping band 3 and the threaded male head 4, and the tail is provided with the clamping head 2 and the threaded female head.

[0032] Specifically, the early warning sub is composed of a second drill rod body 11 and an early warning device 6. Among them,

[0033] The early warning device 6 is installed on the surface or inside of the second drill rod body 11, and is powered by a battery, and is a kind of gas sensor, which can emit a sharp alarm sound when detecting that the concentration of methane, carbon dioxide, or the like exceeds a preset critical concentration.

[0034] Specifically, the inflatable sub comprises a third drill rod body 12, a flexible capsule 7, and a clamping cap 8; the inside of the third drill rod body 12 is a cavity, the middle rigid body of the third drill rod body 12 is thin, and the flexible capsule 7 is sleeved on the outer circle of the rigid body. The third drill rod body 12 and the flexible capsule 7 jointly form a cavity ring. The head of the third drill rod body 12 is a threaded male head 4, and the tail is a threaded female head. The diameters of the two ends of the first drill rod body 5, the second drill rod body 11, and the third drill rod body 12 are equal.

[0035] The flexible capsule 7 is in a cylindrical shape, can be inflated under a certain air pressure or hydraulic pressure, and is nested on the rigid body in the middle of the inflatable sub, and can rotate relative to the rigid body. The flexible capsule 7 is provided with a pressure hole 9, the rigid outer wall of the third drill rod body 12 is provided with a through hole, and the clamping cap 8 is hinged at the through hole; in the initial state, the clamping cap 8 is blocked on the through hole of the third drill rod body 12 and the pressure hole 9, and serves as a switch of the pressure hole 9.

[0036] When the inflatable sub is rotated in the forward direction, the flexible capsule 7 rotates together with the third drill rod body 12, and the pressure hole 9 is sealed by the clamping cap 8; when the inflatable sub is rotated in the reverse direction, the clamping cap 8 is misaligned with the pressure hole 9, and the pressure hole 9 is opened.

[0037] In this embodiment, the tail of the drill bit body 1 is connected with the early warning short section, the tail of the early warning short section is connected with the inflatable short section, and the tail of the inflatable short section is connected with a plurality of drill rods in turn; the female thread at the tail of the drill bit body 1 is threadedly connected with the male thread 4 at the front end of the early warning short section, and the chuck 2 at the tail of the drill bit body 1 and the clamping belt 3 on the early warning short section jointly form a clasp, which plays a locking role, thereby avoiding the loosening of the two ends of the thread connection. Similarly, the early warning short section and the inflatable short section, the inflatable short section and the drill rod at the rear thereof, and the connection between the plurality of drill rods are sequentially connected through the above-mentioned thread and clasp.

[0038] The use method of the drill for detecting small faults proposed in this embodiment is as follows:

[0039] S1: sequentially connect the drill bit, the early warning short section, the inflatable short section, and the drill rod a to form a drill, and connect the tail drill rod a with the drilling machine, wherein the drill bit and the early warning short section are fixed through thread and clasp, and the early warning short section and the inflatable short section and the inflatable short section and the drill rod a are connected through thread. Except for the drill bit, the order of the other short sections and drill rods can be adjusted and flexibly combined.

[0040] S2: start the drilling machine, and circulate the medium (such as air) from the inside of the drill to carry the drill cuttings generated by the drill bit out of the drill hole at the periphery of the drill. The drill rotates forward, drills a certain distance towards the target small fault, and then connects the next drill rod b, and the drill rods are fixed through thread and clasp, and the process is repeated to connect N drill rods.

[0041] S3: as the drilling footage of the drill increases, gradually approach the small fault, and if the concentration of methane, carbon dioxide, etc. exceeds the preset critical concentration after detection, the early warning short section sounds an alarm, at which time the forward rotation of the drilling machine is stopped, the drill is adjusted to reverse rotation, and the rigid body part inside the flexible capsule 7 also rotates reversely. However, due to the frictional resistance between the flexible capsule 7 and the outer wall of the third drill rod body 12, the distance of the reverse rotation of the flexible capsule 7 is less than that of the rigid body of the third drill rod body 12, at which time the clamping cap 8 on the rigid body is displaced relative to the flexible capsule 7, and the pressure hole 9 on the flexible capsule 7 is opened.

[0042] S4: after the pressure hole 9 on the flexible capsule 7 is opened, the reverse rotation of the drill is stopped, the flow of the circulating medium (such as air) is increased through the drilling machine, the clamping cap 8 is pushed open by the increased air pressure, the air flow enters the flexible capsule 7 from the inside of the rigid body through the pressure hole 9, and as the internal pressure of the flexible capsule 7 continues to increase, the flexible capsule 7 expands and expands tightly against the wall of the drill hole, thereby preventing the harmful gases such as methane or carbon dioxide from escaping from the drill hole. After a certain period of time, the drilling machine is started, the drill is rotated forward, and the clamping cap 8 and the pressure hole 9 are closed again. Under the condition of forward rotation, the flexible capsule 7 will be in an expanded state.

[0043] If the warning sound of the early warning sub does not sound, then the drilling is in normal forward rotation.

[0044] The above is further detailed description of the utility model in combination with specific preferred embodiments, which cannot be deemed as limiting the specific embodiments of the utility model to the above, and for ordinary skilled in the art to which the utility model belongs, without departing from the utility model, a number of simple deductions or substitutions can also be made, which shall be deemed as belonging to the utility model and the scope of patent protection determined by the submitted claims.

Claims

1. A drill tool for small fault detection boreholes, characterized by, The drilling tool comprises a drill bit, a plurality of drill rods, a pre-warning sub, and a bulging sub. The pre-warning sub comprises a second drill rod body (11) and a pre-warning device (6), and the pre-warning device (6) is installed on the second drill rod body (11). The second drill rod body (11), the third drill rod body (12), and the drill rods are hollow structures.

2. The borehole drill for small fault detection according to claim 1, wherein The drill bit comprises a drill bit body (1), and a threaded female head is arranged at the tail of the drill bit body (1).

3. The borehole drill for small fault detection according to claim 2, wherein The tail surface of the drill bit body (1) is provided with a clamping head (2).

4. The borehole drilling tool of claim 1, wherein, The tail surface of the drill bit body (1) is provided with a clamping head (2).

5. The borehole drilling tool of claim 1, wherein, The pre-warning device (6) is a gas sensor.

6. The borehole drilling tool of claim 1, wherein, The pre-warning sub is arranged between the drill bit and the bulging sub.

7. The borehole drilling tool of claim 1, wherein, The pre-warning device (6) is installed on the surface or inside of the second drill rod body (11). The diameters of the two ends of the second drill rod body (11), the drill rods, and the third drill rod body (12) are equal.

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