CN210564402U - Rock-breaking type spiral ball centralizer - Google Patents

Abstract

The utility model relates to a drilling engineering technical field, in particular to but garrulous rock formula spiral ball centralizer. The device's centralizer body middle part processing has many spiral wings, is the mud runner between two adjacent spiral wings, has inlayed the ball that can free rotation on the spiral wing, and spiral wing both ends are the slope type terminal surface, and this slope type terminal surface middle part is equipped with the detritus tooth, and this slope type terminal surface border position is equipped with the cutting tooth, and the detritus tooth top is the wedge, and the detritus tooth adopts carbide to make. The utility model discloses a spiral wing department inlays and has a plurality of balls that can carry out the free rotation, and the ball is direct and the wall of a well contact, reduces the frictional resistance of centralizer and the wall of a well, increases the mud area of crossing simultaneously, is favorable to the operation of having tripped the drill, and both ends are inlayed about the spiral wing have a plurality of cutting teeth, can smash and cut the large granule rock that drops.

Description

Rock-breaking type spiral ball centralizer

The technical field is as follows:

the utility model relates to a drilling engineering technical field, in particular to but garrulous rock formula spiral ball centralizer.

Background art:

the Wenqian shale gas is the key point of the unified development at present as a national strategic plan, and due to the characteristics of rocks, the phenomenon of well wall block falling is easy to occur in the shale gas exploitation process, and particularly in the horizontal section drilling process, the problem of frequent drilling sticking accidents exists no matter a rotary guide tool or a conventional orientation tool is adopted. On-site studies have found that the most likely sticking location is generally the location of the centralizing blocks at the upper and lower ends of the downhole directional tool. The face contact centralizer that current adopted usually, in case meet the serious condition that falls the piece, the bold detritus between two centralizers is piled up easily after drilling certain footage to because the great gap that falls between the piece is also big, even if pile up when very full, also not big to ground pump pressure influence, the consequence that causes like this is exactly that ground circulation is unblocked, can't get rid of the detritus after increasing the pump pressure yet. The condition directly causes that the probability of early drill sticking is higher and the shock, acid soaking or other stuck freeing agents cannot be effectively implemented in the process of exploiting the shale gas directional well.

At present, various centralizers are used for improving the centering degree of a drilling tool assembly and reducing the frictional resistance in the casing running process, and the problem that a large number of underground blocks fall off and are stuck in a drilling manner cannot be solved.

The utility model has the following contents:

the to-be-solved technical problem of the utility model is to provide a but garrulous rock formula spiral ball centralizer, the device has realized that spiral wing department inlays and has a plurality of balls that can carry out the free rotation, the ball is direct and the wall of a well contact, reduce the frictional resistance of centralizer and the wall of a well, increase mud flow area simultaneously, be favorable to the operation of tripping a drill, both ends are inlayed about the spiral wing and have a plurality of cutting teeth, can smash and cut dropping large granule rock, change it into tiny particle rock fragment, and then directly return ground or return ground after being further smashed by the drill bit in the shaft bottom along with on mud, prevent that the massive rock from falling the piece card and causing the sticking accident in centralizer both ends, this instrument is used for shale gas exploitation in-process wall of a well rock to fall the stratum that the piece frequently appears, can promote the operating efficiency, reduce the emergence accident risk. The defect that the existing centralizer can not solve the problem of large-scale block falling and drill clamping of the well wall is overcome.

The utility model adopts the technical proposal that: a spiral ball centralizer capable of crushing rocks comprises a centralizer body; the centralizer body middle part processing has many spiral wings, is the mud runner between two adjacent spiral wings, has inlayed the ball that can free rotation on the spiral wing, and spiral wing both ends are the slope type terminal surface, and this slope type terminal surface middle part is equipped with the detritus tooth, and this slope type terminal surface border position is equipped with the cutting tooth, and the detritus tooth top is the wedge, and the detritus tooth adopts carbide to make, and the maximum external diameter at the position of installation ball is greater than the external diameter that is equipped with cutting tooth and detritus tooth department, and the maximum external diameter at the position of installation ball is less than the drill bit diameter.

The cutting surface of the cutting tooth is embedded with a diamond compact.

The utility model has the advantages that: the utility model discloses a spiral wing department inlays and has a plurality of balls that can carry out the free rotation, the ball is direct and the wall of a well contact, reduce the frictional resistance of centralizer and the wall of a well, increase mud flow area simultaneously, be favorable to the operation of tripping the drill, both ends are inlayed about the spiral wing have a plurality of cutting teeth, can smash and cut dropping large granule rock, change it into tiny particle rock fragment, and then return ground or fall to the shaft bottom when stewing and return ground after further smashing by the drill bit on the mud, prevent that the bold rock from falling the piece card and causing the card drilling accident in centralizer both ends, this instrument is used for shale gas exploitation in-process wall of a well rock to fall the stratum that the piece was frequently sent, can promote the operating efficiency, reduce the emergence accident risk.

Description of the drawings:

the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the present invention.

The specific implementation mode is as follows:

as shown in fig. 1, a spiral ball centralizer capable of crushing rocks comprises a centralizer body 1; the processing of 1 middle part of centralizer body has many spiral wings 2, be mud runner 3 between two adjacent spiral wings 2, it has ball 4 that can the free rotation to inlay on the spiral wing 2, 2 both ends of spiral wing are the slope type terminal surface, this slope type terminal surface middle part is equipped with detritus tooth 6, this slope type terminal surface border position is equipped with cutting teeth 5, the 6 tops of detritus tooth are the wedge, detritus tooth 6 adopts carbide to make, detritus tooth 6 is used for carrying out preliminary chisel to the bold rock around it that drops and is smashed, become medium-sized granule. The cutting teeth 5 are used for further cutting the preliminarily crushed medium-sized particles, and after the medium-sized particles are crushed into small-sized particles, the small-sized particles return to a wellhead along with slurry, so that large rocks are prevented from falling and accumulating on two sides of the righting block to cause a drill jamming accident. The biggest external diameter at the position of installation ball 4 is greater than the external diameter that is equipped with cutting teeth 5 and garrulous rock tooth 6 department, and the biggest external diameter at the position of installation ball 4 is less than the drill bit diameter for play the effect of protecting the footpath to centralizer body 1, in order to prevent to play the operation in-process of drilling down, cutting teeth 5 and garrulous rock tooth 6 and wall of a well direct contact have also avoided excessive injury wall of a well simultaneously. The cutting surface of the cutting tooth 5 is embedded with a diamond compact.

As shown in figure 2, the utility model is arranged at the upper and lower ends of the underground directional tool 7 and is put into the well along with the drilling tool. When the lifting and lowering operation is carried out, the balls 4 on the spiral wings 2 of the centralizer are in direct contact with the casing or the well wall, and the cutting teeth 5 and the rock crushing teeth 6 are prevented from damaging the well wall or the casing.

In the drilling operation process, when the borehole wall collapses and falls blocks, large-particle rock falls blocks and can be accumulated at two ends of the directional tool 7 and the centralizer, so that the tripping operation is blocked, and the blockage can not be released even if the discharge capacity of the mud pump is increased. Rotatable drilling tool combination carries out normal reaming operation this moment, and centralizer body 1 rotates along with the drilling tool combination this moment, and bold rock can be respectively under the impact and the shearing action of centralizer both ends detritus tooth 6 and cutting tooth 5, and the breakage is small-size rock fragment, increases the slush pump discharge capacity afterwards again for piece after the breakage returns the well head along with mud, has avoided the sticking accident.

It should be understood that the above detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can still be modified or equivalently replaced to achieve the same technical effects; as long as the use requirement is satisfied, the utility model is within the protection scope.

Claims (2)

1. A spiral ball centralizer capable of crushing rocks comprises a centralizer body (1); the method is characterized in that: the centralizer body (1) middle part processing has many spiral wings (2), be mud runner (3) between two adjacent spiral wings (2), it has ball (4) of ability free rotation to inlay on spiral wing (2), spiral wing (2) both ends are the slope type terminal surface, this slope type terminal surface middle part is equipped with detritus tooth (6), this slope type terminal surface border position is equipped with cutting tooth (5), detritus tooth (6) top is the wedge, detritus tooth (6) adopt carbide to make, the biggest external diameter at the position of installation ball (4) is greater than the external diameter that is equipped with cutting tooth (5) and detritus tooth (6) department, the biggest external diameter at the position of installation ball (4) is less than the drill bit diameter.

2. The detritus spiral ball centralizer of claim 1, wherein: and the cutting surface of the cutting tooth (5) is embedded with a diamond compact.

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