CN216477161U

CN216477161U - Concentric casing drilling tool for drilling stratum

Info

Publication number: CN216477161U
Application number: CN202220060280.5U
Authority: CN
Inventors: 项建熙; 张君华
Original assignee: Changsha Kunling Machinery Co ltd
Current assignee: Changsha Kunling Machinery Co ltd
Priority date: 2022-01-11
Filing date: 2022-01-11
Publication date: 2022-05-10
Anticipated expiration: 2032-01-11

Abstract

The utility model discloses a concentric pipe drilling tool for boring stratum, including central drill bit, annular drill bit, pipe shoe, follow pipe, its characterized in that central drill bit is connected with annular drill bit, annular drill bit is connected with the pipe shoe, and central drill bit drives annular drill bit and then drives the pipe shoe and rotate together, follows the pipe box in the pipe shoe to with pipe shoe clearance fit, be followed the pipe direction by the pipe shoe. The utility model provides a prior art follow pipe push down with the drill bit when following in step on not synchronous problem, this kind of structure makes pipe boot and follow pipe can adopt engineering material simultaneously to can reduce cost and be applicable to and make a well, reduce the rust pollution to the water source.

Description

Concentric casing drilling tool for drilling stratum

Technical Field

The utility model relates to a concentric pipe-following drilling tool for drilling strata such as soil texture, cobblestones, rubble, solution cavity, fine and close granite rock.

Background

The concentric pipe following drilling tool is usually used for drilling of strata such as soil, cobblestones, broken stones, karst caves and compact granite rocks, and generally comprises a steel central drill bit, an annular drill bit, a pipe shoe and a following pipe. This kind of drilling tool is often used in the well drilling, and steel is followed pipe and pipe shoe and is worked under muddy water environment basically, very easily leads to the pipe shoe to rust and then seriously influences quality of water, and this kind of drilling tool cost is higher in addition, therefore how to guarantee that quality of water is not polluted by the iron rust and can reduce the drilling tool cost when the drilling tool is beaten the well is the problem that needs to solve at present urgently.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can reduce to water pollution and can reduce cost a concentric pipe-following drilling tool for boring stratum. The concentric pipe following drilling tool comprises a central drill bit, an annular drill bit, a pipe shoe and a pipe following, wherein the central drill bit is connected with the annular drill bit, the annular drill bit is connected with the pipe shoe, the central drill bit drives the annular drill bit to further drive the pipe shoe to rotate together, the pipe following is sleeved in the pipe shoe and in clearance fit with the pipe shoe, and the pipe following is guided by the pipe shoe.

In order to firmly connect the annular drill bit and the pipe shoe, the annular drill bit and the pipe shoe are connected with each other through matched grooves and bosses. And the annular drill bit and the pipe shoe are in interference fit.

Preferably, the boot has a guide section with a length sufficient to ensure the coaxiality of the heel tube and the boot.

The utility model discloses owing to be connected pipe boot and annular drill bit, pipe boot and follow pipe clearance fit, the improvement of this kind of structure makes pipe boot and follow pipe can adopt engineering material to can reduce cost and enable the drilling tool operation under the muddy water scene and not fear to rust, reduce the possibility that water is polluted by the iron rust from this greatly, be particularly useful for the operation of digging a well.

Drawings

Fig. 1 is a schematic view of a prior art structure.

Fig. 2 is a schematic structural diagram of the present invention.

Reference numerals: the pipe-drilling machine comprises a central drill bit 1, an annular drill bit 2, a pipe shoe 3, a heel pipe 4, a groove 5, a boss 6 and a guide section 7.

Detailed Description

Fig. 2 reflects the structure of the present invention, and it can be seen from the figure that the present invention has the center bit 1, the ring bit 2, the pipe shoe 3, the pipe 4, the center bit 1 is connected with the ring bit 2, and the ring bit 2 is driven by the center bit 1 to creep into. The bottom of pipe shoe 3 is boss 6, and annular bit 2 has recess 5, and boss 6 cooperatees with recess 5 and be interference fit in order to realize annular bit 2 and pipe shoe 3's firm connection. The heel tube 4 is sleeved in the tube shoe 3, the tube shoe 3 mainly has the effect of guiding the heel tube, and therefore the tube shoe 3 is provided with a guide section 7 which has enough length to ensure the coaxiality of the heel tube and the tube shoe so as to realize good guiding. Follow pipe 4 and pipe boot 3 and all adopt engineering plastic to make to ensure the utility model discloses the realization of drilling tool structure can not pollute quality of water when this drilling tool is used for digging a well, can reduce the drilling tool cost simultaneously.

The utility model discloses the theory of operation is different with prior art, the utility model discloses a lean on central brill, annular to bore and the pipe boot rotates downward pore-forming, and the pressure disk that leans on under the unit head is being pressed down with the pipe to by the pipe boot direction.

Claims

1. A concentric pipe following drilling tool for drilling stratum comprises a central drill bit, an annular drill bit, a pipe shoe and a pipe following, and is characterized in that the central drill bit is connected with the annular drill bit, the annular drill bit is connected with the pipe shoe, the central drill bit drives the annular drill bit to further drive the pipe shoe to rotate together, the pipe following is sleeved in the pipe shoe and is in clearance fit with the pipe shoe, and the pipe following is guided by the pipe shoe.

2. A concentric casing drill for drilling subterranean formations according to claim 1, wherein the annular drill bit and the casing shoe are interconnected by cooperating grooves and lands.

3. A concentric casing drill for drilling subterranean formations according to claim 1 or 2, wherein an interference fit is used between the ring bit and the shoe.

4. A concentric heel tube drilling tool for drilling subterranean formations according to claim 1 or 2, wherein the shoe is long enough to ensure coaxiality of the heel tube with the shoe.

5. The concentric heel tube drilling tool for drilling subterranean formations according to claim 3, wherein the shoe is long enough to ensure coaxiality of the heel tube with the shoe.