CN201679446U

CN201679446U - Multi-roller bit with conical palm back

Info

Publication number: CN201679446U
Application number: CN2010201950776U
Authority: CN
Inventors: 季凤岐; 胡友生; 罗绪良
Original assignee: TIANJIN LILIN BIT CO Ltd
Current assignee: TIANJIN LILIN BIT CO Ltd
Priority date: 2010-05-18
Filing date: 2010-05-18
Publication date: 2010-12-22
Anticipated expiration: 2020-05-18

Abstract

The utility model relates to a multi-roller bit with conical palm back, comprising more than two rollers and toothed palms, more than two toothed palms are connected in a closing way, the inner lower side of the bottom part of the toothed palm is connected with the rollers, the palm back is arranged at the outer side of the toothed palm, and a threaded connecting port connected with a drilling rod is arranged at the upper end of the toothed palm; the multi-roller bit is characterized in that: the shape of the toothed palm back is a conical surface which is inclined to the central line of the multi-roller bit from bottom to top, and the included angle of the bus of the conical surface and the central line of the multi-roller bit is theta which is more than or equal to 170 degrees and is less than 180 degrees; the multi-roller bit has the beneficial effects that: as the multi-roller bit with conical palm back is adopted, the annular space between the bit body and the well wall is increased, so as to be beneficial to returning crumbs; meanwhile, the contact area of the bit palm back and the well wall is reduced, the friction force is reduced, turning moment is reduced, energy consumption is reduced, the drilling speed is improved, the working efficiency is improved, and the service life of the multi-roller bit is prolonged.

Description

Polydonita wheel drill bit with conical surface palm back of the body

Technical field

The utility model relates to the rock bit that is used for oil and gas well drilling and mining drilling well, relates in particular to a kind of polydonita wheel drill bit with conical surface palm back of the body.

Background technology

Rock bit is when rotated owing to have the effect of impact, crushing and shearing-crushing formation rock, and be used for soft,, hard various stratum, therefore in oil drilling and mining drilling well field extensive use, especially the tricone bit application is the most universal.With the tricone bit is example, its structure mainly comprise closed loop crowd around three lobe bit legs of connection, respectively by bearing be connected the bit leg inner underside three gear wheels, be located at the oil supply system on the bit leg and be located at the mouth that is threaded of the jointed rod of tricone bit upper end.The palm back of the body of at present typical its bit leg of tricone bit structure is the bus face of cylinder parallel with the rock bit center line, from the drill bit monnolithic case, gear wheel part outline maximum, palm back of the body face of cylinder part outer profile size is little than the gear wheel part, the size of upper end screw thread connector further reduces, therefore, when carrying out drillng operation, along with creeping into of rock bit, landwaste returns out with mud continuously along the annular space that forms between the bit body and the borehole wall, make the continuous drilling of rock bit rock stratum descending, landwaste is constantly discharged drilling well.But rock bit can be worn and torn after use for a long time, and it is consequently close or identical with the outer profile size of slapping back of the body face of cylinder part that gear wheel outer profile size is partly reduced, at this moment, the bit leg palm back of the body can contact the borehole wall, increase frictional force on the one hand, torque strengthens, and power consumption strengthens, annular space is reduced, cause landwaste to be blocked in the drilling well easily, the drill bit dry run can not contact the rock stratum and flog a dead horse, and increases energy consumption, lower efficiency, drillng operation can not normally be moved.

The utility model content

Main purpose of the present utility model is at the problems referred to above, a kind of polydonita wheel drill bit with conical surface palm back of the body is provided, make annular space increase between the drill bit and the borehole wall, be beneficial to and return bits, reduce the drill bit palm back of the body and borehole wall contact area, thereby, reduce friction, reduce torque, cut down the consumption of energy, improve bit speed, increase work efficiency.

The technical scheme that its technical problem that solves the utility model adopts is:

A kind of polydonita wheel drill bit with conical surface palm back of the body, comprise plural gear wheel, bit leg, described plural bit leg is closed loop and crowds around connection, bit leg bottom inner underside connects gear wheel, the bit leg outside is the palm back of the body, the bit leg upper end is provided with the mouth that is threaded of jointed rod, and the profile that it is characterized in that the described bit leg palm back of the body is the conical surface of taking turns the center line inclination of drill bit from the bottom to top to described polydonita.

The angle of the bus of the described conical surface and described polydonita wheel center line of bit is θ, 170 °≤θ＜180 °.

The beneficial effects of the utility model are: owing to adopted the polydonita wheel drill bit with conical surface palm back of the body, make annular space increase between the bit body and the borehole wall, be beneficial to and return bits; Simultaneously, prevent that the drill bit palm back of the body from contacting entirely with the borehole wall or the face contact, change into the line contact, reduce contact area, thereby, reduce friction, reduce torque, cut down the consumption of energy, improve bit speed, increase work efficiency, and prolong polydonita wheel drilling life of bit.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Among the figure: 1 polydonita wheel center line of bit, 2 bit legs, 21 mouths that are threaded, 22 palm back ofs the body, 221 cone elements, 3 gear wheels.

Below in conjunction with drawings and Examples the utility model is described in detail.

The specific embodiment

Fig. 1 illustrates a kind of polydonita wheel drill bit with conical surface palm back of the body, present embodiment is a tricone bit, comprise three gear wheels 3, three bit legs 2, above-mentioned three bit legs 2 are closed loop and crowd around connection, bit leg 2 bottom inner undersides connect gear wheel 3, bit leg 2 outsides are the palm back of the body 22, and bit leg 2 upper ends are provided with the mouth 21 that is threaded of jointed rod, and the profile that it is characterized in that the above-mentioned bit leg palm back of the body 22 is the conical surface that tilts to polydonita wheel center line of bit 1 from the bottom to top.

As shown in the figure, the bus 221 of the above-mentioned conical surface is θ with the angle of polydonita wheel center line of bit 1,170 °≤θ＜180 °.

In actual applications, polydonita wheel drill bit can be the drill bit of double-cone bit, tricone bit or more a plurality of gear wheels.

When the polydonita wheel drill bit that employing has a conical surface palm back of the body carries out drill-well operation, make that annular space increases between the bit body and the borehole wall, be beneficial to and return bits; Simultaneously, even after a period of time uses, the rock bit wearing and tearing can prevent that also the drill bit palm back of the body from contacting entirely with the borehole wall or the face contact, contact and change into line, reduce contact area, thereby, reduce friction, energy-conservation, raising speed is raised the efficiency and is prolonged polydonita and takes turns drilling life of bit, guarantees that drillng operation normally moves.

The above only is a preferred embodiment of the present utility model, is not shape material of the present utility model and structure are done any pro forma restriction.Every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.

Claims

1. the polydonita with conical surface palm back of the body is taken turns drill bit, comprise plural gear wheel, bit leg, described plural bit leg is closed loop and crowds around connection, bit leg bottom inner underside connects gear wheel, the bit leg outside is the palm back of the body, the bit leg upper end is provided with the mouth that is threaded of jointed rod, and the profile that it is characterized in that the described bit leg palm back of the body is the conical surface of taking turns the center line inclination of drill bit from the bottom to top to described polydonita.

2. the polydonita wheel drill bit with conical surface palm back of the body according to claim 1 is characterized in that the bus of the described conical surface and the angle of described polydonita wheel center line of bit are θ, 170 °≤θ＜180 °.