Extra-large-diameter coring multi-stage guiding anti-deviation drilling tool

Abstract

The utility model relates to the technical field of exploration drilling tools, and provides an extra-large-diameter coring multi-stage guide anti-deviation drilling tool which comprises a stable-deviation drilling tool unit and a guide hole drilling tool unit, and at least one reducer union is connected between the stable-deviation drilling tool unit and the guide hole drilling tool unit. The guide hole drilling tool unit comprises a drill bit, a first-stage reamer and a first-stage coring drilling tool which are connected in sequence; a plurality of spiral chip guiding strips are arranged outside the first-stage reamer and the second-stage reamer in a surrounding mode. The anti-deviation straight-keeping drill bit has good anti-deviation straight-keeping effects, and ensures that the normal drilling track of the drill bit does not deviate.

Description

Technical Field

[0001] The utility model relates to the technical field of exploration drilling tools, in particular to a multi-stage guiding anti-deflection drilling tool for coring with a particularly large diameter. Background Art

[0002] When drilling large-diameter seismic monitoring holes in riverbeds, where the strata are mostly loose and fragmented, diamond coring is typically used. Round cores are collected for laboratory testing, with the maximum borehole diameter reaching 484 mm. While the core borehole diameter is quite large, the drill rod diameter is relatively small relative to the drill bit. This often leads to deviation in the drilling trajectory, especially when the borehole diameter changes. To prevent this deviation during borehole diameter changes, a steerable, anti-deflection drill tool was designed for use in very large-diameter coring. Utility Model Content

[0003] The purpose of the utility model is to provide a multi-stage guiding anti-deflection drilling tool for coring with a large diameter, which can have a good anti-deflection effect and ensure a correct drilling trajectory.

[0004] The embodiment of the present utility model is realized through the following technical solutions: an extra-large diameter coring multi-stage guided anti-deflection drill tool includes a deflection-stabilizing drill tool unit and a guide hole drill tool unit, at least one reducer is connected between the deflection-stabilizing drill tool unit and the guide hole drill tool unit; the guide hole drill tool unit includes a drill bit, a first-level reamer and a first-level coring drill tool connected in sequence; a plurality of spiral chip guide strips are arranged around the outside of the first-level reamer.

[0005] Furthermore, the inclination-stabilizing drilling tool unit includes a secondary reamer and a secondary coring drill, and the front end of the secondary reamer is connected to the rear end of the reducer.

[0006] Furthermore, the diameter of the secondary reamer is larger than the diameter of the primary reamer.

[0007] Furthermore, the front end of the reducer is a tapered structure.

[0008] Furthermore, the drill bit, the first-stage reamer and the first-stage coring drill are connected by threads.

[0009] Furthermore, the length of the pilot hole drilling unit is 600-800 mm.

[0010] The technical solution of the embodiments of the present invention has at least the following advantages and beneficial effects: the present invention arranges a next-level coring drill bit and a reamer to drill a pilot hole before lowering the casing. After lowering the casing, the diameter is changed so that the next-level drill tool can smoothly enter the pilot hole for coring drilling, thereby making it less likely that the drilling trajectory will deviate when the hole diameter is changed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 A schematic structural diagram of a large-diameter coring multi-stage guide anti-deflection drilling tool provided in an embodiment of the present utility model;

[0013] Figure 2 It is a structural schematic diagram of the first-stage reamer in the utility model.

[0014] Icons: 1-guide hole drilling unit, 11-drill bit, 12-first-stage reamer, 121-spiral chip guide bar, 13-first-stage coring drill, 2-steady-angle drilling unit, 21-second-stage reamer, 22-second-stage coring drill, 3-reducing joint. DETAILED DESCRIPTION

[0015] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0017] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0018] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] Example

[0020] The following is further described in conjunction with specific embodiments. Figure 1-Figure 2 As shown, this embodiment is a multi-stage guided anti-deflection drill tool for extra-large diameter coring, comprising a stabilizing drill tool unit 2 and a guide hole drill tool unit 1, wherein at least one reducer 3 is connected between the stabilizing drill tool unit 2 and the guide hole drill tool unit 1; the guide hole drill tool unit 1 comprises a drill bit 11, a first-level reamer 12 and a first-level coring drill tool 13 connected in sequence; a plurality of spiral chip guide strips 121 are arranged around the outside of the first-level reamer 12; specifically, when the extra-large diameter coring drill needs to change diameter, and before casing is lowered, the drill bit 11 first drives the first-level reamer 12 and the first-level coring drill tool 13 to drill into a pilot hole with a slightly smaller diameter, thereby ensuring that the next-level drill tool can smoothly coring along the pilot hole, thereby preventing the problem of deviation of the diameter change trajectory during the coring drilling process; and the spiral chip guide strips 121 of the first reamer can grind and extrude the hole wall, making the hole wall more firm and compact to avoid collapse.

[0021] Reference Figure 1 As shown, the inclination stabilizing drilling tool unit 2 in this embodiment includes a secondary reamer 21 and a secondary coring drill 22. The front end of the secondary reamer 21 is connected to the tail end of the reducer 3; the diameter of the secondary reamer 21 is larger than the diameter of the primary reamer 12. The specific inclination stabilizing drilling tool unit 2 is connected to the rear end of the guide hole drilling tool unit 1, and continues to enter the pilot hole for coring, cooperating with the guide hole drilling tool unit 1 to make the trajectory less likely to deviate.

[0022] It should be noted that the front end of the reducer 3 is a tapered structure, which helps the reducer 3 to squeeze into a hole with a smaller diameter.

[0023] In order to facilitate disassembly, assembly and maintenance, the drill bit 11, the first-level reamer 12 and the first-level coring drill 13 are connected by threads; and the two ends are alternately internal and external threads, and the connection between the first-level reamer 12 and the first-level coring drill 13 is an equal-diameter structure.

[0024] In addition, the length of the pilot hole drilling unit 1 is 600-800 mm. Specifically, if it is too long, it is easy to break, and if it is too short, the anti-deflection effect is poor.

[0025] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. Extra large diameter coring multi-stage guiding anti-deflection drilling tool, characterized by: It comprises a stabilizing drilling tool unit (2) and a guide hole drilling tool unit (1), wherein at least one reducing joint (3) is connected between the stabilizing drilling tool unit (2) and the guide hole drilling tool unit (1); The pilot hole drilling tool unit (1) comprises a drill bit (11), a primary reamer (12) and a primary coring drilling tool (13) which are connected in sequence; A plurality of spiral chip guide strips (121) are arranged around the outside of the primary reamer (12).

2. The large diameter coring multi-stage guiding anti-deflection drilling tool according to claim 1, characterized in that: The deflection-stabilizing drilling tool unit (2) comprises a secondary reamer (21) and a secondary coring drilling tool (22), and the front end of the secondary reamer (21) is connected to the rear end of the reducer (3).

3. The large diameter coring multi-stage guiding anti-deflection drilling tool according to claim 2 is characterized in that: The diameter of the secondary reamer (21) is greater than the diameter of the primary reamer (12).

4. The large diameter coring multi-stage guiding anti-deflection drilling tool according to claim 1, characterized in that: The front end of the reducer (3) is a conical structure.

5. The large diameter coring multi-stage guiding anti-deflection drilling tool according to claim 1, characterized in that: The drill bit (11), the primary reamer (12) and the primary coring drill (13) are connected by threads.

6. The large diameter coring multi-stage guiding anti-deflection drilling tool according to claim 1, characterized in that: The length of the guide hole drilling unit (1) is 600-800 mm.

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