CN87212876U - Scraper drill of nodular cast iron - Google Patents

Abstract

The utility model relates to a scraper drill for geological drilling, which is made from nodular cast iron and is formed by adopting the casting molding. The fin beta is a spiral shape and is less than 15 DEG and the vertex angle gamma of the drill is less than 180 DEG. The top side of the drill is provided with a plurality of jet holes with inclination angles of 30 to 35 DEG, and a cutting angle between the welded hard alloy and the ground surface is 80 to 85 DEG. The utility model has the advantages of simple manufacture processes; in addition, the cost of production can reduced by 28% or so, and the efficiency of the well drilling can increased by 35-45% or so.

Description

Scraper drill of nodular cast iron

The utility model is to belong to a kind of drilling tool that geological drilling is used.Existing geology drag bit provides the drill bit data of CT-155 rig as the U.S., Canada, and its material is a cast steel, and the hard metal tip of welding-on is stepped, and specification is 40 * 8 * 15, and the cutting angle is 90 °, and hole for water spraying is positioned at the middle part.Make this drill bit, not only cost height, and cast steel is to smelting equipment and technical requirements height, domestic general manufacturer production difficulty.The XGG75mm drag bit of domestic production at present, drill body is to use round steel, steel plate is a main material, through cutting, machine, welding, machine forms again.This drill bit three fins and bit central line parallel, be 120 ° uniform, head is a flat-top, hole for water spraying be positioned at the middle part.The carbide alloy of welding-on is 60 ° of square type alloy sheets, and specification is 5 * 5 * 10, and the cutting angle is 90 °.This class drill produced complex process, the cost height, stock-removing efficiency is low.

For solving the problem that above-mentioned drag bit exists, the purpose of this utility model is that a kind of manufacturing process of production is simple, and cost of production is low, the drilling bit with scraper that drilling efficiency is high.In order to achieve the above object, the utility model has been done following improvement to existing drag bit:

1. selecting ductile iron for use is the drill body material; 2. drill bit three fins are β＜15 ° right-hand screw, and center line of bit is 120 ° of symmetrical distributions, and its fin thickness B is 16～20mm; 3. drill bit drift angle γ＜180 °; 4. the hard metal tip on the drill edge 2, quantity is 10～12, cutting angle α is 80 °～85 °; 5. a plurality of aperture d are arranged is 8～15mm in the bit body top side, and declination angle is 30 °～35 ° a hole for water spraying.

Fig. 1: ductile iron body drag bit overall structure figure.

1. drill body; 2. hard metal tip; 3. thread connection part; 4. fin; 5. hole for water spraying.

γ: drill bit drift angle.

Fig. 2: the K of tab construction is to view.

β: fin helical angle;

α: cutting angle;

B: fin thickness.

Fig. 3: drill bit blade carbide alloy welding-on figure.

By reference to the accompanying drawings the spheroidal graphite cast-iron drag bit is described further:

Drill body 1(among Fig. 1 comprises thread connection part 3, fin 4, hole for water spraying 5) it is take spheroidal graphite cast-iron as material, adopts the method casting of the modeling of living to form. Cutting edge hard metal tip 2 is 10～12, is 60 ° of square type alloys, and specification is 5 * 5 * 10, presses Fig. 3 welding-on on fin 4. The drift angle γ at drill bit top＜180 °.

Three fins of bit body are β＜15 ° right-hand screw around bit central among Fig. 2, and 120 ° uniform, and its cutting angle α is 80～85 °.

This drill bit be by

1:5,10 teeth/inch inside tapered thread coupling part 3 connect with drilling rod, feed in the rotation of rig and to drive the drag bit rotary drilling under the motion, it is to be that 30 °～35 °, aperture d are that 8～15mm) flushing fluids that spray are taken well head out of by hole for water spraying 5(declination angle that cutting rock is down cut fragment.

Because the utility model has adopted above-mentioned technical characterictic, institute is so that manufacturing procedure has reduced by seven roads, and amount of machining reduces 22%, and by the test confirmation, cost of production can reduce by 28%, and drilling efficiency can improve 34～45%, can make the cost of every mouthful of well descend 30%.

Claims (1)

1, a kind of ductile iron body drag bit that is used for geological drilling, it is made up of drill body 1 (comprising thread connection part 3, fin 4, hole for water spraying 5) and hard metal tip 2.

It is characterized in that:

(1) this drill body 1 is a ductile iron;

(2) three fin right hand helix angle β＜15 °,

(3) three fins are 120 ° of symmetrical distributions to center line of bit;

(4) fin 4 thickness B are 16～20mm;

(5) drill bit drift angle γ＜180 °;

(6) a plurality of aperture d are arranged is 8～10mm in the bit body top side, and inclination angle Φ is 30～35 ° a hole for water spraying;

(7) hard metal tip on the drill edge 2, quantity are the 10-12 sheet, and cutting angle α is 80～85 °.

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