CN212201911U

CN212201911U - Drilling head suitable for drilling hard stratum

Info

Publication number: CN212201911U
Application number: CN202020812456.9U
Authority: CN
Inventors: 任宇翔; 李可进; 卢登辉; 杨远红; 卢敏姝
Original assignee: Chengdu Western Unionpetro Engineering Technology Co ltd
Current assignee: Chengdu Western Unionpetro Engineering Technology Co ltd
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2020-12-22
Anticipated expiration: 2030-05-15

Abstract

The utility model discloses a well drilling head suitable for bore hard stratum, it is including welding in the drill bit of drilling rod (1) bottom, and the drill bit includes drill bit body (2), and the bottom welding of drill bit body (2) has pillar stand (3), and the welding has cone (4) on the basal surface of pillar stand (3), and cone (4), pillar stand (3), drill bit body (2) and drilling rod (1) are coaxial to be set up, and on the cylinder of cone (4) and along its length direction welding have a plurality of carbide teeth A (5), on the basal surface of drill bit body (2) and along the circumferencial direction welding of pillar stand (3) have a plurality of wing (6), on every wing (6) and along its length direction welding have a plurality of carbide teeth B (7), seted up the airtight chamber A (8) of intercommunication drilling rod (1) in drill bit body (2). The utility model has the advantages that: compact structure, prevent inclined shaft, can bore high strength stereoplasm ground, low in manufacturing cost.

Description

Drilling head suitable for drilling hard stratum

Technical Field

The utility model relates to a bore the technical field of drill bit structure for the stereoplasm ground, especially a drilling head suitable for bore stereoplasm ground.

Background

In the oil exploration drilling operation, can not leave the PDC drill bit, the PDC drill bit has advantages such as the mechanical drilling speed is fast, long-lived, advance chi height in the homogeneous soft or medium hardness stratum, but when the drilling of stereoplasm stratum, the working property of this kind of PDC drill bit worsens, the PDC composite sheet on the PDC drill bit produces cracked and excessive wearing and tearing phenomenon easily, lead to the bit early damage, its leading cause is 1, the stereoplasm stratum includes carbonate rock, igneous rock, gravel etc., lead to the intensity in stereoplasm stratum very big, can make the PDC blade of PDC drill bit wear to damage in the short time to the life of PDC drill bit has been reduced. 2. Because the compressive strength of the hard stratum is high, the PDC blade can be effectively eaten into the stratum only by increasing the bit pressure, so that the fragmentation and high-temperature abrasion of the PDC blade are easily caused. 3. The PDC bit is broken rock with the shearing mode, and when actually drilling into, the PDC bit is easy to drill into toward the fragile direction, and then leads to the PDC bit to creep into along the incline direction to bore out the inclined shaft that does not conform to the requirements rather than required straight well. In order to solve the problem that the existing PDC drill bit is difficult to drill a high-strength hard stratum, most manufacturers weld a plurality of high-strength diamonds at the bottom of the drill bit, and although the hard alloy stratum can be drilled through the high-strength diamonds, the drilling cost is undoubtedly increased, and the PDC drill bit is not suitable for small exploration enterprises. Therefore, a drilling head which is used for preventing inclined wells, can drill high-strength hard stratum and has low manufacturing cost is needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's shortcoming, provide a compact structure, prevent the inclined shaft, can bore high strength stereoplasm ground, low in manufacturing cost is applicable to the well drilling head that bores the stereoplasm ground.

The purpose of the utility model is realized through the following technical scheme: the utility model provides a well drilling head suitable for bore stereoplasm ground, it includes the drill bit that welds in the drilling rod bottom, the drill bit includes the drill bit body, the bottom welding of drill bit body has the column deck, the welding has the conical head on the basal surface of column deck, conical head, column deck, drill bit body and the coaxial setting of drilling rod, on the cylinder of conical head and have a plurality of carbide teeth A along its length direction welding, on the basal surface of drill bit body and have a plurality of blades along the circumferencial direction welding of column deck, have a plurality of carbide teeth B on every blade and along its length direction welding, set up the sealed chamber A of intercommunication drilling rod in the drill bit body, set up sealed chamber B in the column deck, sealed chamber B and sealed chamber A intercommunication, a plurality of hole for water sprayings have been seted up on the cylinder of column deck, the hole slope sets up downwards and communicates with sealed chamber B, the welding has a plurality of carbide teeth C on the cylinder of column deck, the carbide cutter teeth C are positioned below the water spray holes.

The column base is a conical base.

The hard alloy cutter teeth A are uniformly distributed on the conical head.

The hard alloy cutter teeth B are uniformly distributed on the cutter wings.

The water spray holes are uniformly distributed on the column base.

Six blades are welded on the bottom surface of the drill body and are uniformly distributed on the drill body.

The outer diameter of the pillar stand is smaller than the outer diameter of the drill bit body.

The utility model has the advantages of it is following:

1. the utility model discloses a bell mouth is drilled out earlier in the stereoplasm ground to carbide sword tooth A on the conical head to make stereoplasm ground stress concentration in bell mouth department, the compressive strength in stereoplasm ground has been reduced, and carbide sword tooth C and carbide sword tooth B creep into on the stereoplasm ground that the compressive strength degree reduces, consequently need not to increase the brill pressure of drilling rod, thereby effectively avoided carbide sword tooth C and carbide sword tooth B to break or wearing and tearing, very big extension this well drilling head's life.

2. The pre-drilled tapered holes also serve to guide the column and prevent drilling of deviated wells.

3. The drilling head does not use diamond to drill hard stratum, but adopts common hard alloy cutter teeth, thereby greatly saving the drilling cost and simultaneously reducing the manufacturing cost.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic main section view of FIG. 1;

FIG. 3 is a bottom view of FIG. 2;

FIG. 4 is a schematic view of the present invention;

in the figure, 1-drill rod, 2-drill bit body, 3-pillar stand, 4-conical head, 5-hard alloy cutter tooth A, 6-blade, 7-hard alloy cutter tooth B, 8-closed cavity A, 9-closed cavity B, 10-water spray hole, 11-hard alloy cutter tooth C, 12-hard stratum, 13-conical hole and 14-well hole.

Detailed Description

The invention will be further described with reference to the accompanying drawings, without limiting the scope of the invention to the following:

as shown in fig. 1-3, a well drilling head suitable for drilling hard ground, it is including welding in the drill bit of drilling rod 1 bottom, the drill bit includes drill bit body 2, the bottom welding of drill bit body 2 has pillar stand 3, the external diameter of pillar stand 3 is less than the external diameter of drill bit body 2, pillar stand 3 is the cone-shaped stand, and the welding has cone 4 on the bottom surface of pillar stand 3, cone 4, pillar stand 3, drill bit body 2 and the coaxial setting of drilling rod 1, on the cylinder of cone 4 and along its length direction welding have a plurality of carbide sword tooth A5, in this embodiment, carbide sword tooth A5 evenly distributed is on cone 4.

On the basal surface of drill bit body 2 and along the circumferencial direction welding of pillar stand 3 have a plurality of wing knives 6, on every wing knife 6 and along its length direction welding have a plurality of carbide sword tooth B7, carbide sword tooth B7 evenly distributed on wing knife 6, set up the sealed chamber A8 of intercommunication drilling rod 1 in the drill bit body 2, set up sealed chamber B9 in the pillar stand 3, sealed chamber B9 and sealed chamber A8 intercommunication, a plurality of hole for water jets 10 have been seted up on the cylinder of pillar stand 3, hole for water jets 10 evenly distributed is on pillar stand 3, hole for water jets 10 slope sets up downwards and communicates with sealed chamber B9, the welding has a plurality of carbide sword tooth C11 on the cylinder of pillar stand 3, and carbide sword tooth C11 is located the below of hole for water jets 10.

Six blades 6 are welded on the bottom surface of the drill bit body 2, and the six blades 6 are uniformly distributed on the drill bit body 2.

The working process of the utility model is as follows:

s1, connecting the upper end part of the drill rod 1 to the output end of an oil rig by an oil worker, starting the oil rig, and putting the drill bit and the drill rod 1 into a hard stratum by the oil rig; simultaneously pumping high-pressure drilling fluid into the drill rod 1, wherein the drilling fluid is ejected outwards from the water spraying hole 10 sequentially through an inner cavity of the drill rod 1, a closed cavity A8 and a closed cavity B9, and the drilling fluid plays a role in reducing the temperature of the hard alloy cutter teeth;

s2, the oil drilling machine drives the drill rod to rotate, the drill rod 1 drives the drill bit to rotate, the hard alloy cutter tooth A5 rotating on the conical head 4 firstly breaks hard rock and drills the hard rock into the hard stratum 12, after the conical head 4 drills into the hard stratum 12 completely, a tapered hole 13 can be formed in the hard stratum 12 as shown in figure 4, then the hard alloy cutter tooth C11 drills into the tapered hole 13 along the axial direction of the tapered hole 13, after the column base 3 drills into the tapered hole 13 completely, a straight hole is drilled on the basis of the tapered hole 13, then the hard alloy cutter tooth A5 drills into the hard stratum 12 to form the borehole 14, and therefore the borehole is drilled into the hard stratum.

Because the hard alloy cutter tooth A5 on the conical head 4 drills the conical hole 13 in the hard stratum 12 firstly, the stress of the hard stratum 12 at the conical hole 13 is concentrated, the compressive strength of the hard stratum is reduced, and the hard alloy cutter tooth C11 and the hard alloy cutter tooth B7 drill on the hard stratum with the reduced compressive strength, the drilling pressure of a drill rod does not need to be increased, so that the fracture or abrasion of the hard alloy cutter tooth C11 and the hard alloy cutter tooth B7 is effectively avoided, and the service life of the drilling head is greatly prolonged. Furthermore, the pre-drilled tapered holes 13 also serve as a guide for the column 3, avoiding drilling of deviated wells.

The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. A drilling head suitable for drilling hard formations, characterized in that: it includes the drill bit that welds in drilling rod (1) bottom, the drill bit includes drill bit body (2), the bottom welding of drill bit body (2) has stylobate (3), the welding has cone (4) on the basal surface of stylobate (3), cone (4), stylobate (3), drill bit body (2) and drilling rod (1) coaxial arrangement, on the cylinder of cone (4) and along its length direction welding have a plurality of carbide sword teeth A (5), on the basal surface of drill bit body (2) and along the circumferencial direction welding of stylobate (3) have a plurality of wing of sword (6), on every wing (6) and along its length direction welding have a plurality of carbide sword teeth B (7), set up the airtight chamber A (8) that communicate drilling rod (1) in drill bit body (2), set up airtight chamber B (9) in the stylobate (3), airtight chamber B (9) and airtight chamber A (8) intercommunication, a plurality of hole for water jets (10) have been seted up on the cylinder of pillar stand (3), hole for water jets (10) slope set up downwards and with airtight chamber B (9) intercommunication, the welding has a plurality of carbide sword tooth C (11) on the cylinder of pillar stand (3), and carbide sword tooth C (11) are located the below of hole for water jets (10).

2. A drilling head suitable for drilling hard formations according to claim 1, wherein: the column base (3) is a conical base.

3. A drilling head suitable for drilling hard formations according to claim 1, wherein: the hard alloy cutter teeth A (5) are uniformly distributed on the conical head (4).

4. A drilling head suitable for drilling hard formations according to claim 1, wherein: the hard alloy cutter teeth B (7) are uniformly distributed on the cutter wings (6).

5. A drilling head suitable for drilling hard formations according to claim 1, wherein: the water spray holes (10) are uniformly distributed on the column base (3).

6. A drilling head suitable for drilling hard formations according to claim 1, wherein: six blades (6) are welded on the bottom surface of the drill bit body (2), and the six blades (6) are uniformly distributed on the drill bit body (2).

7. A drilling head suitable for drilling hard formations according to claim 1, wherein: the outer diameter of the column base (3) is smaller than that of the drill bit body (2).