一种机械式螺旋强制排浆钻具

Abstract

本实用新型公开了一种机械式螺旋强制排浆钻具，包括钻头、钻杆和动力机构，钻杆包括前钻杆、标准钻杆节和后钻杆，钻头设在前钻杆的前端，标准钻杆节逐节设置且首尾相连形成标准钻杆，前钻杆和后钻杆分别设在标准钻杆节的前后端，后钻杆与动力机构连接；前钻杆、标准钻杆节和后钻杆均包括外管和出浆螺旋，出浆螺旋位于外管中，并与外管共轴设置。本实用新型内外共轴设置钻杆和出浆螺旋，通过外部的钻杆进行自钻孔施工，通过出浆螺旋实现强制排浆排渣，采用共轴设计保证结构紧凑，并且保证了功能的互不干涉，实现钻孔和排渣的同步进行；出浆螺旋在地内压力超出初始压力时进行强制排浆排渣，保证了地内压力的稳定。

Claims

1. A mechanical spiral forced discharge drilling tool, characterized by: The system includes a drill bit (1), a drill rod, and a power mechanism (2). The drill rod includes a front drill rod (3), a standard drill rod section (4), and a rear drill rod (5). The drill bit (1) is located at the front end of the front drill rod (3). The standard drill rod sections (4) are arranged in sections and connected end to end to form a standard drill rod. The front drill rod (3) and the rear drill rod (5) are respectively located at the front and rear ends of the standard drill rod section (4). The rear drill rod (5) is connected to the power mechanism (2). The front drill pipe (3), standard drill pipe section (4) and rear drill pipe (5) all include an outer tube and a slurry discharge spiral (32), wherein the slurry discharge spiral is located in the outer tube and is coaxially arranged with the outer tube; The front drill pipe (3) includes a first outer tube (31) and a first slurry outlet spiral (32), the standard drill pipe section (4) includes a second outer tube (41) and a second slurry outlet spiral (42), and the rear drill pipe (5) includes a third outer tube (51) and a third slurry outlet spiral (52). The first outer tube (31) and the second outer tube (41) are provided with a functional cavity (311) and a slurry outlet cavity (312). The third outer tube (51) is provided with a slurry outlet cavity (312). The first outer tube (31) The second outer tube (41) and the third outer tube (51) are connected to each other. The slurry outlet chamber (312) is located at the center of the first outer tube (31) and the second outer tube (41). The functional chambers (311) are spaced apart on the tube walls of the first outer tube (31) and the second outer tube (41), and the functional chambers (311) on the first outer tube (31) and the second outer tube (41) are continuously arranged. The first slurry outlet spiral (32), the second slurry outlet spiral (42) and the third slurry outlet spiral (52) are connected to each other.

2. The mechanical spiral forced discharge drilling tool according to claim 1, characterized in that: The rear end of the first outer tube (31), the end of the second outer tube (41) and the front end of the third outer tube (51) are provided with a connector (313). The first outer tube (31) and the second outer tube (41), adjacent second outer tubes (41) and the second outer tube (41) are connected by the connector (313). The connector (313) is provided with protrusions (3131) spaced apart, and a groove (3132) is provided between adjacent protrusions (3131). The protrusions (3131) and grooves (3132) on adjacent connectors (313) form a mortise and tenon joint that fits together and is connected.

3. A mechanical spiral forced discharge drilling tool according to claim 2, characterized in that: The functional cavity (311) corresponds to the boss (3131) or the groove (3132), and the functional cavities (311) between adjacent mating joints (313) are connected by a sealing shaft.

4. The mechanical spiral forced discharge drilling tool according to claim 1, characterized in that: The front drill rod (3) is provided with a slurry discharge port (33) and a slurry discharge mechanism (34). The slurry discharge port (33) connects the slurry outlet (312) and the outside. The slurry discharge mechanism (34) includes an opening and closing device (341) and a gate (342). The gate (342) is located in the slurry discharge port (33) and is connected to the opening and closing device (341).

5. The mechanical spiral forced discharge drilling tool according to claim 1, characterized in that: The power mechanism (2) includes a main power unit (21) and a secondary power unit (22). The main power unit (21) is connected to the outer pipe, and the secondary power unit (22) is connected to the discharge screw.

6. A mechanical spiral forced slurry discharge drilling tool according to claim 1, characterized in that: The functional cavities (311) are high-pressure water cavity, low-pressure water cavity, hydraulic cavity and sensor cavity respectively.

7. The mechanical spiral forced discharge drilling tool according to claim 1, characterized in that: The functional cavities (311) and the slurry outlet cavities (312) are arranged in parallel with the outer tubes.

8. The mechanical spiral forced discharge drilling tool according to claim 2, characterized in that: The butt joints (313) are connected through bolts.

Images