CN201334876Y - Spiral centering device for preventing from accumulating rock debris - Google Patents

Abstract

The utility model relates to a spiral centering device for preventing from accumulating rock debris; the spiral centering device is connected with a drilling string and can rotate with the rotation of the drilling string. The technical proposal is that: the main body (1) of the spiral centering device for preventing from accumulating rock debris is a hollow cylinder, the upper and lower ends are provided with buttons for connection, a three-wing spiral body (3) is a three-wing helix which can rotate 120 degrees on the cylinder, and the upper end surface of the three-wing spiral body (3) is formed by combining a multiple-corner reverse surface (2).

Description

A kind of anti-accumulation landwaste spiral centralizer

One, technical field:

The utility model relates to a kind of well-drilling borehole with the anti-landwaste spiral centralizer of piling up, and can be connected in the underground drill stem for a kind of, prevents in the normal drilling process drill bit in the down-hole overlong time, and can not play the anti-accumulation landwaste spiral centralizer of drill string.

Two, background technology:

At present, the domestic and international centralizer that uses in the drilling process, last fillet surface in the process that pulls out of hole, the easy mud cake on the scraping borehole wall, on produce a large amount of accumulation landwaste, cause to pull out of hole difficultly, even cause down-hole complexity and accident.For guaranteeing that drill string can be tripped out smoothly, in drilling process, put on just at set intervals and put once, to guarantee that well is unimpeded.

Three, utility model content:

The utility model is in order to solve the weak point in the above-mentioned background technology, providing a kind of creeps into the anti-landwaste spiral centralizer of piling up, itself and drill string join becomes a part in the drill string, this instrument is because last chamfering is the multiaspect chamfering, preferably resolve and in trip-out process, do not produce talus deposit, guarantee to pull out of hole smoothly.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of creeping into the anti-landwaste spiral centralizer of piling up is characterized in that: anti-pile up landwaste spiral centralizer for creep in drill string in the middle of link together, become an ingredient in the drill string, each drill string intermediate combination 2-3.

Above-mentioned anti-accumulation landwaste spiral centralizer is by the conveyor screw that mills out 120 ° on three wings on cylinder body, and on conveyor screw the insert gauge teeth, the terrace of appearing on the stage is the multiaspect chamfering, and the mud cake of institute's scraping is decomposed by the multiaspect chamfering in the trip-out process, and slides under the centralizer along conveyor screw.

Compared with prior art, the advantage and the effect that the utlity model has are as follows:

Above-mentioned anti-accumulation landwaste spiral centralizer is combined by the three wings conveyor screw that an insert scraping stratum PDC sheet is arranged on individual cylinder, last sloping platform rank are polygonal chamfering, reduced the chance that landwaste is piled up on sloping platform terrace on the instrument, drill string assembly as shown in Figure 2, strengthen the smooth degree of drill string in trip-out process greatly, can not adopt midway to make a trip midway, draw the borehole wall with drill bit because of drilling time is long.

Four, description of drawings:

Fig. 1 is a section of structure of the present utility model;

Fig. 2 is a duty reference diagram of the present utility model.

Among the figure, 1-main body, the polygonal face of 2-, 3-three wings conveyor screw, 4-PDC sheet.

Five, the specific embodiment:

Referring to Fig. 1, the utility model is by the anti-landwaste spiral centralizer main body (1) of piling up, polygonal face (2), three wings conveyor screw (3), PDC sheet (4) is formed, and anti-accumulation landwaste spiral centralizer main body (1) is the cylinder of a hollow, two ends all are useful on the button of binding up and down, three wings conveyor screw (3) is the three wings spiral of 120 ° of rotations on cylinder, and PDC sheet (4) is to be installed in three wings conveyor screw (3), and last sloping platform terrace is that polygonal face (2) combines.When preventing that accumulation landwaste spiral centralizer and drill string link together, because the landwaste mud cake of scraping can't be stopped on the sloping platform terrace and descending along helicoid in the drill string trip-out process, phenomenons such as trip-out difficulty have been reduced, strengthen the smooth degree of drill string in trip-out process greatly, can not adopt midway to make a trip midway, draw the borehole wall with drill bit because of drilling time is long.

As shown in Figure 2, after preventing that accumulation landwaste spiral centralizer and drill string link together, along with going up of drill string, the landwaste and the mud cake of centralizer scraping on the borehole wall are descending along conveyor screw, have improved trip-out efficient, keep well unimpeded.

Claims (2)

1, a kind of drill string is with preventing piling up landwaste spiral centralizer, it is characterized in that: anti-accumulation landwaste spiral centralizer is that main body (1) is the cylinder of a hollow, two ends all are useful on the button of binding up and down, three wings conveyor screw (3) is the three wings spiral of 120 ° of rotations on cylinder, and PDC sheet (4) is to be installed on the three wings conveyor screw (3) to combine.

2, a kind of drill string according to claim 1 is characterized in that with preventing piling up landwaste spiral centralizer: described three wings conveyor screw (3) upper surface is that polygonal face (2) combines.

Images