CN2159450Y

CN2159450Y - Casing drill

Info

Publication number: CN2159450Y
Application number: CN 93203757
Authority: CN
Inventors: 蔡冠球; 刘云虎; 孙玉敏; 袁继祥; 韩喜月
Original assignee: HEZE TRACTOR STATION
Current assignee: HEZE TRACTOR STATION
Priority date: 1993-02-23
Filing date: 1993-02-23
Publication date: 1994-03-23
Anticipated expiration: 2003-02-23

Abstract

The utility model relates to the mechanical field of hydraulic engineering, particularly a drilling tool for a water flushing type well drilling machine. The drilling tool for a water flushing type well drilling machine is suitable for being used for the areas in which holes are not easily formed by the existing drilling tool under complicated geological conditions, such as encountering a shifting sand layer and a boulder layer. The drilling tool for a water flushing type well drilling machine is composed of a drilling rod, a drilling sleeve, and a drilling head. After the drills into the required depth under a ground in a rotary mode, a well pipe is inserted into from the inner hole of the drilling rod, the drilling head is knocked down, the drilling rod and the drilling sleeve are extracted, and the well pipe can be arranged onto the required depth. The drilling tool for a water flushing type well drilling machine is used, and the problems that a well wall collapses, a well hole is blocked to death, and the well pipe can not be inserted into a bottom after the existing drilling tool is extracted from a well hole are solved.

Description

Casing drill

The utility model relates to hydraulic engineering mechanism field, is specifically related to a kind of drilling tool of flush-type trepan, particularly is suitable under the complex geological condition drilling tool of well casing under the rapid drilling.

Existing flush-type trepan drilling tool is wanted to extract out from wellhole earlier after boring puts in place, descends well casing again.When geological conditions is better, can keep borehole wall not subside by hydrostatic pressure, well casing can insert wellhole smoothly.And when geological conditions was relatively poor, as underground chance boulder bed, drift sand formation etc., then after drilling tool was extracted out, borehole wall subsided immediately, and the wellhole bottom is blocked, and well casing can not insert and put in place.This is that existing drilling tool often runs into and a unsolved always difficult problem.

Task of the present utility model is that a kind of improved drilling tool will be provided, and it can get out wellhole in the relatively poor area of geological conditions easily, inserts well casing down, enlarges the trepan scope of application.

Task of the present utility model is finished as follows: some joint drilling rods are with being threaded togather, the lower end links to each other with drill bushing with screw thread, drill bushing bottom inner conical surface and drill bit top male cone (strobilus masculinus) are connected, and insert by the brill leaf afterbody on the drill bit in the groove of drill bushing, rotate synchronously with drilling rod, drill bushing to keep drill bit.Each endoporus that saves drilling rod and drill bushing leads directly to, and the well casing of certain diameter can pass through smoothly.During drilling well, rig drives drilling rod, drill bushing, drill bit rotary drilling.Simultaneously, send into press water,, go out the tiny silt of part when water returns ground between borehole wall and drilling rod from the ejection of the drill bit mouth of a river by drilling rod, drill bushing endoporus.When drilling well reaches the requirement degree of depth, stop boring and send water.Insert well casing down the endoporus that leads directly in drilling rod, and with well casing bottom bump drill bit, drill bit and drill bushing are separated from the supporting place of circular cone, drill bit falls.Can extract out and respectively save drilling rod and drill bushing this moment.Well casing is stayed and is required in the degree of depth wellhole, and drilling well can once be finished with following well casing.

Below with reference to accompanying drawing the utility model is described in further detail.

Fig. 1 is the longitudinal sectional view of a kind of concrete structure of the utility model.

Fig. 2 is that drill bushing K is to view.

Fig. 3 is that drill bit K is to view.

With reference to Fig. 1, some joints have the drilling rod (1) of mesopore and drill bushing (2) all to be adopted and is threaded togather, and each saves drilling rod (1) and goes up equal symmetry two feather keys (4) are housed, and drilling rod (1) connects back feather key (4) and should align, feather key (4) plays transferring power, drives the effect of drilling tool rotation.Each mesopore that saves drilling rod (1) and drill bushing (2) leads directly to, and the well casing of certain diameter can pass through smoothly.Adopt circular cone to be connected at the A place between drill bushing (2) and the drill bit (3).With reference to Fig. 2,3, drill bushing (2) bottom have six groove B(wherein three-flute be standby), the afterbody of the brill leaf (5) that drill bit (3) is outside can extend in three grooves of drill bushing (2), drives drill bit (3) with drilling rod (1), drill bushing (2) rotation with this.Bore leaf (5) and be used for boring the expansion wellhole simultaneously.In drill bit (3) bottom and the front of boring leaf (5) direction of rotation delivery port C is arranged, from then on the press water under drilling rod (1) endoporus is logical sprays.

This device drill bushing (2) cooperates with the circular cone that drill bit (3) adopts, and the bonding strength in the time of should guaranteeing to hole comes off before unlikely the putting in place, guarantees when boring puts in place knocking-on smoothly with well casing again.

This apparatus structure is simple, and existing well sinker also improves a little and can use, thereby enlarges the existing well sinker scope of application.

Claims

1, a kind of bushing type drilling tool, this drilling tool is made up of drilling rod (1), drill bushing (2), drill bit (3), with the supporting use of flush-type trepan, it is characterized in that respectively saving between the drilling rod (1), all adopt between drilling rod (1) and the drill bushing (2) to be threaded, the employing circular cone is connected between drill bushing (2) and the drill bit (3).

2, pipe box formula drilling tool as claimed in claim 1 is characterized in that drilling rod (1) and drill bushing (2) endoporus are straight-through, and the well casing of certain diameter can insert from the hole.

3, pipe box formula drilling tool as claimed in claim 1 is characterized in that respectively saving drilling rod (1) outside cylinder symmetry two feather keys (4) is housed, and each saves drilling rod (1) and connects back feather key (4) alignment.

4, pipe box formula drilling tool as claimed in claim 1 is characterized in that there are six grooves drill bushing (2) bottom, and inside is that conical bore upward cooperates in the tapering with drill bit (3).

5, pipe box formula drilling tool as claimed in claim 1 is characterized in that having on the drill bit (3) three to bore leaf (5), bores in the groove of leaf (5) afterbody insertion drill bit (3).Delivery port C is arranged at the front and drill bit (3) bottom of boring leaf (5).