Over-diameter broaching anti-deviation tower type device for full-hole continuous coring directional drilling

Abstract

The utility model relates to a full-hole continuous coring directional drill over-diameter broaching anti-deviation tower type device. When a complex stratum is drilled in the existing full-hole continuous coring directional horizontal hole drilling process, the problems that the hole expanding difficulty is large, a drilling tool deviates in the hole expanding process, and the hole expanding efficiency is low exist. The reamer bit comprises a first-stage reamer bit, a second-stage reamer bit and an anti-deviation guide pipe, the first-stage reamer bit is fixedly connected with the second-stage reamer bit, the second-stage reamer bit is fixedly connected with the deviation-preventing guide pipe, the deviation-preventing guide pipe is located at the front end of the whole device, and the connecting center axis of the first-stage reamer bit, the connecting center axis of the second-stage reamer bit and the connecting center axis of the deviation-preventing guide pipe are located on the same straight line. And a plurality of drill bit water gaps are formed in the front ends of the first-stage reaming drill bit and the second-stage reaming drill bit. When a complex stratum is drilled, the reaming difficulty is reduced, deviation of a drilling tool in the reaming process is avoided, and the reaming efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering geological exploration, in particular to a full-hole continuous coring directional drilling over-diameter hole expansion anti-deviation tower-type device. Background Art

[0002] At present, in engineering geological core drilling, especially in the process of directional horizontal hole drilling, complex formations are often encountered, such as block falling, collapse and necking caused by instability of the hole wall; serious leakage in the hole causing drill burning, rock powder adsorption and drill jamming, etc. In order to prevent frequent accidents in the hole, large-diameter drill bits are often used to expand the hole and then insert casing to block the abnormal zone to ensure smooth passage through the abnormal zone of the formation and complete engineering exploration. However, in the current horizontal hole drilling process, due to the horizontal drill rod force problem, coupled with the uneven hardness of the formation, under the influence of factors such as drilling eccentricity, trajectory deviation and other factors, serious in-hole accidents often occur. On the other hand, conventional hole-expanding devices are also difficult to expand the hole to the required large diameter in one go. They expand the diameter one level at a time, or expand to the previous level first, wait for the problem to occur again, and then pull out the casing to expand the hole. Such repeated hole expansion and extraction of drill tools will induce instability of the hole wall and cause secondary accidents in the hole. It will also cause a significant increase in auxiliary time, seriously delaying production progress.

[0003] In summary, when encountering complex formations during the existing full-hole continuous coring directional horizontal hole drilling process, there are problems such as difficulty in hole expansion, deviation of the drill tool during hole expansion, and low hole expansion efficiency. Summary of the invention

[0004] The utility model aims to provide a full-hole continuous coring directional drilling over-diameter hole expansion anti-deviation tower-type device, so as to at least solve the problems of great difficulty in hole expansion, deviation of the drill tool during hole expansion and low hole expansion efficiency when encountering complex formations during the existing full-hole continuous coring directional horizontal hole drilling process.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A full-hole continuous coring directional drilling cross-diameter hole expansion anti-deviation tower-type device, comprising a primary hole expansion drill bit, a secondary hole expansion drill bit and an anti-deviation guide tube;

[0007] The primary reaming drill bit is fixedly connected to the secondary reaming drill bit, and the secondary reaming drill bit is fixedly connected to the anti-deflection guide tube, the anti-deflection guide tube is located at the front end of the entire device, and the connection center axes of the primary reaming drill bit, the secondary reaming drill bit and the anti-deflection guide tube are located on the same straight line;

[0008] The front ends of the first-stage reaming drill bit and the second-stage reaming drill bit are both provided with a plurality of drill water inlets.

[0009] Furthermore, the diameter of the first-stage reaming drill bit is 125-135 mm.

[0010] Furthermore, the diameter of the secondary reaming drill bit is 105-115 mm.

[0011] Furthermore, the anti-deflection guide tube has a diameter of 90-100 mm.

[0012] Furthermore, the tail of the first-stage reaming drill bit and the second-stage reaming drill bit are connected by welding.

[0013] Furthermore, the distance between the first-stage reaming drill bit and the second-stage reaming drill bit is 5-10 cm.

[0014] Furthermore, the length of the anti-deflection guide tube is 25 to 30 cm.

[0015] Furthermore, the middle end of the anti-deflection guide tube is connected to the secondary reaming drill bit by welding.

[0016] Furthermore, the distance between the anti-deflection guide tube and the secondary reaming drill bit is 10-15 cm.

[0017] Furthermore, the drill bit nozzle is square or U-shaped.

[0018] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0019] 1. The utility model has strong applicability. It not only has the functions of the original equipment, but also can expand the hole in one step according to the actual production needs, reducing the frequent drilling and drilling processes, reducing the difficulty of expanding the hole, and avoiding the hole wall instability caused by the expansion process.

[0020] 2. The utility model is suitable for the expansion of directional horizontal drilling with full-hole continuous coring. An anti-deviation guide tube is added to the top of the drill bit to avoid serious accidents such as trajectory deviation caused by drilling pressure, torque imbalance, alternation of soft and hard rocks, etc. during the expansion process;

[0021] 3. The utility model is simple to operate, has strong versatility, and has low requirements on actual operators, and can be widely promoted to engineering drilling units;

[0022] 4. The utility model is simple to manufacture and has low cost. It includes a primary reaming drill bit, a secondary reaming drill bit and an anti-deviation guide tube. Each component is extremely common in the unit and is easy to purchase in the market. The center points of the three components can be kept in a straight line. The drilling unit can be easily manufactured on site.

[0023] 5. The utility model has high hole expansion efficiency. During the hole expansion process, the rock mass cut at each stage is thinner and the required torque is smaller. Under the same power output conditions, the rotation speed and drilling pressure can be increased, thereby improving the rock cutting efficiency and the hole expansion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of this embodiment;

[0026] The symbols in the figure are:

[0027] 1-First-stage reaming drill bit, 2-Second-stage reaming drill bit, 3-Anti-deviation guide tube, 4-Drill bit nozzle. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0029] In the description of the present invention, it should be understood that the terms "center", "up", "down", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example:

[0032] like Figure 1As shown, the utility model provides a full-hole continuous coring directional drilling over-diameter hole expansion anti-deviation tower-type device, which uses the existing drilling drill bit as a guide device, adds a secondary diamond grinding drill bit on the outside thereof, and forms a multi-stage tower-type hole expansion anti-deviation device, including a primary hole expansion drill bit 1, a secondary hole expansion drill bit 2 and an anti-deviation guide tube 3.

[0033] The first-stage reaming drill bit 1 is fixedly connected to the second-stage reaming drill bit 2, and the second-stage reaming drill bit 2 is fixedly connected to the anti-deflection guide tube 3. The anti-deflection guide tube 3 is located at the front end of the entire device, and the connection center axes of the first-stage reaming drill bit 1, the second-stage reaming drill bit 2 and the anti-deflection guide tube 3 are located on the same straight line.

[0034] A plurality of drill bit water inlets 4 are provided at the front ends of the first-stage reaming drill bit 1 and the second-stage reaming drill bit 2. In the present embodiment, the drill bit water inlets 4 are square. In other embodiments, the drill bit water inlets 4 may also be U-shaped. The number and specifications of the drill bit water inlets 4 are sufficient to meet the flow rate of the flushing liquid in the water-passing section, so as to achieve the purpose of cooling the drill bit and removing rock powder.

[0035] The first-level reaming drill bit 1 has a diameter of 130 mm and is the rear end of the entire device. The first-level reaming drill bit 1 uses a φ130 mm composite sheet drill bit suitable for the overburden and broken zone or a diamond drill bit suitable for hard rock. In other embodiments, the outer diameter specification of the first-level reaming drill bit 1 can be determined according to the drilling structure, drilling plan and actual conditions. The first-level reaming drill bit 1 is connected to the tail of the second-level reaming drill bit 2 by welding. The spacing between the first-level reaming drill bit 1 and the second-level reaming drill bit 2 is 5-10 cm, and during the welding process, the central axes of the first-level reaming drill bit 1 and the second-level reaming drill bit 2 are always kept in a straight line to ensure that the center of gravity remains unchanged.

[0036] The secondary reaming drill bit 2 is located in the middle of the primary reaming drill bit 1 and the smaller anti-deflection guide tube 3. The secondary reaming drill bit 2 is selected as a φ110mm diamond drill bit according to the stratum, and is located in the middle of a leap-over tower. In other embodiments, the outer diameter specification of the secondary reaming drill bit 2 can be determined according to the drilling structure, drilling plan and actual conditions. The distance between the cutting edge of the secondary reaming drill bit 2 and the cutting edge of the primary reaming drill bit 1 is 5-10cm, and the distance between the secondary reaming drill bit 2 and the anti-deflection guide tube 3 is 10-15cm.

[0037] The anti-deflection guide tube 3 is located at the front end of the entire device, has a diameter of 95 mm, and an overall length of 25 to 30 cm. In other embodiments, the outer diameter specification of the anti-deflection guide tube 3 can be determined according to the drilling structure, drilling plan and actual conditions. The middle end of the anti-deflection guide tube 3 is connected to the secondary reaming drill bit 2 by welding, and the spacing between the anti-deflection guide tube 3 and the secondary reaming drill bit 2 is 10-15 cm. The end section of the anti-deflection guide tube 3 is connected to the drill rod by a thread.

[0038] During the preparation process of this embodiment, each stage of the drill bit is completed by welding, and the axes of the three parts are on the same straight line to prevent deviation during drilling and loose connection, which may cause the equipment to be left in the hole and cause accidents in the hole.

[0039] The working principle of this embodiment is as follows:

[0040] During the directional horizontal hole drilling process, if a complex formation is encountered and the current caliber cannot meet the casing isolation or accident handling of the complex section, then reaming is required. First, the end of the anti-deviation guide tube 3 is connected to the drill tool through a thread, and positive circulation drilling is started from the hole mouth or the predetermined caliber. At the same time, the water pump is turned on, and the flushing fluid starts to flow from the drill tool to the front end of the anti-deviation guide tube 3. When the flushing fluid encounters the face, it will flow back and flow back to the front end of the secondary reaming drill bit 2. At this time, the secondary reaming drill bit 2 is grinding the rock mass, and the flushing fluid carries the rock powder formed by grinding through the drill bit water inlet 4 along the annular space to the primary reaming drill bit 1. At this time, the primary reaming drill bit 1 is also cutting the rock mass, and the formed rock powder is carried to the outside of the hole through the flushing fluid through the drill bit water inlet 4 along the annular space, thereby completing the reaming work. During the reaming process, the anti-deviation guide tube 3 is consistent with the aperture size and plays a guiding role to ensure that it moves forward along the existing hole during the reaming process, and at the same time, the residual rock blocks in the hole are collected and processed. After completing the hole expansion work, the large-diameter drill bit is lowered into the hole as the casing to complete the casing wall protection work.

[0041] The above specific examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. For those skilled in the art of the present invention, some simple deductions, deformations or substitutions can be made based on the idea of ​​the present invention.

Claims

1. A full-hole continuous coring directional drilling over-diameter hole expansion anti-deviation tower-type device, comprising a first-stage hole expansion drill bit (1), characterized in that: It also includes a secondary hole-reaming drill bit (2) and an anti-deflection guide tube (3); The primary reaming drill bit (1) is fixedly connected to the secondary reaming drill bit (2), and the secondary reaming drill bit (2) is fixedly connected to the anti-deflection guide tube (3). The anti-deflection guide tube (3) is located at the front end of the entire device, and the connection center axes of the primary reaming drill bit (1), the secondary reaming drill bit (2) and the anti-deflection guide tube (3) are located on the same straight line; A plurality of drill bit water inlets (4) are provided at the front ends of the first-stage reaming drill bit (1) and the second-stage reaming drill bit (2).

2. The full-hole continuous coring directional drilling over-diameter expansion anti-deviation tower-type device according to claim 1 is characterized in that: The diameter of the first-stage reaming drill bit (1) is 125-135 mm.

3. The full-hole continuous coring directional drilling over-diameter expansion anti-deviation tower-type device according to claim 1 is characterized by: The diameter of the secondary reaming drill bit (2) is 105-115 mm.

4. The full-hole continuous coring directional drilling over-diameter expansion anti-deviation tower-type device according to claim 1 is characterized by: The anti-deflection guide tube (3) has a diameter of 90-100 mm.

5. The full-hole continuous coring directional drilling over-diameter expansion anti-deviation tower-type device according to claim 1 is characterized by: The tails of the primary reaming drill bit (1) and the secondary reaming drill bit (2) are connected by welding.

6. The full-hole continuous coring directional drilling over-diameter expansion anti-deviation tower-type device according to claim 1, characterized in that: The distance between the primary reaming drill bit (1) and the secondary reaming drill bit (2) is 5-10 cm.

7. The full-hole continuous coring directional drilling over-diameter expansion anti-deviation tower-type device according to claim 1, characterized in that: The length of the anti-deflection guide tube (3) is 25 to 30 cm.

8. The full-hole continuous coring directional drilling over-diameter expansion anti-deviation tower-type device according to claim 1, characterized in that: The middle end of the anti-deflection guide tube (3) is connected to the secondary reaming drill bit (2) by welding.

9. The full-hole continuous coring directional drilling over-diameter expansion anti-deviation tower-type device according to claim 1, characterized in that: The distance between the anti-deflection guide tube (3) and the secondary reaming drill bit (2) is 10-15 cm.

10. The full-hole continuous coring directional drilling over-diameter expansion anti-deviation tower-type device according to claim 1, characterized in that: The drill head water inlet (4) is square or U-shaped.

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