CN201050304Y

CN201050304Y - Horizontal well diamond composite slices kickoff bit

Info

Publication number: CN201050304Y
Application number: CNU2007200124118U
Authority: CN
Inventors: 秦雷; 邱伟; 薛广宽; 郭红峰
Original assignee: Liaohe Petroleum Exploration Bureau
Current assignee: Liaohe Petroleum Exploration Bureau
Priority date: 2007-05-31
Filing date: 2007-05-31
Publication date: 2008-04-23
Anticipated expiration: 2017-05-31

Abstract

A polycrystalline diamond compact (PDC) kick off bit of horizontal well for the drilling of petroleum engineering is composed of the main and the secondary cutters, a bit spiral blade and a bit port. For the kick off bit, a five-blade bit body is adopted and provided with five spiral bit blades. In each spiral bit blade, four to seven main cutters of the polycrystalline diamond compact and two secondary cutters of cemented carbide with high-intensity are welded and a bit port is arranged between each spiral bit blade. With the utility model, the problem that the directional drilling is difficult to achieve because of the arrangement difficulties of the tool face in the construction of horizontal well, which is caused by the deviation of the tool face of the deflecting drilling tool from the designed direction due to the unstable torque fluctuations of the work of bits in the prior art, is resolved. Therefore, the utility model can be widely applied in the drilling operations of petroleum engineering.

Description

Horizontal well diamond compact deflecting bit

Technical field:

The utility model relates to a kind of horizontal well diamond compact deflecting bit of petroleum works probing usefulness.

Background technology:

Conventional diamond compact (PDC) drill bit that present oil field is used is when underground work, compare rock bit, the work torque is comparatively responsive to formation variation, because the pressure of the drill changes and bottom rock soft or hard inequality, bigger variation takes place in the cutting teeth depth of tooth penetration, thereby brings the fluctuation of diamond compact (PDC) drill bit work torque unstable, causes deflecting drilling tool face off-design direction, construction causes tool-face to put difficulty to horizontal well, is difficult to realize directional drilling.

The utility model content:

The purpose of this utility model provides a kind of horizontal well diamond compact deflecting bit, it is unstable that this drill bit has solved the diamond compact bit work torque fluctuation that exists in the prior art, cause deflecting drilling tool face off-design direction, construction causes tool-face to put difficulty to horizontal well, is difficult to realize the problem of directional drilling.

The technical scheme that its technical problem that solves the utility model adopts is: horizontal well diamond compact deflecting bit is made up of main cutting tooth, secondary cutting teeth, drill bit spiral wing, bit port: deflecting bit adopts five wing bit bodys, in bit body, be provided with five spiral wings, be welded with the main cutting tooth made with diamond compact and the secondary cutting teeth of high strength cemented carbide in each wing, at the interplane bit port that is provided with of each circular knife; Drill bit design adopts the short circle of mean curvature bizet shape, guarantees the drill sleeve body life time when improving the bit lateral aggressivity ability again; Adopt to become back rake angle cloth tooth, the cutting teeth back rake angle is that 15～21 degree increase from inside to outside gradually, and the control drill bit is cut ability to the stratum, improves the drill bit shock resistance simultaneously; Adopt compound guarantor directly to design, reduce the borehole wall mill resistance of drill bit, satisfy the requirement of medium radius horizontal well deflecting at horizontal segment; The cloth tooth adopts major-minor cutting teeth structure, two main cutting tooth back locations outside each wing hat leans, be laid with the tooth post as secondary cutting teeth,, can limit the penetraction depth of PDC bit cutting tooth by the proud exposure of the secondary cutting teeth of the amount of establishing PDC drill bit reasonably.

The beneficial effects of the utility model are, and are simple in structure, easy to operate; This drill bit can be given full play to its maximum deflecting ability; Directed flash adjustment is easy.

Description of drawings:

Accompanying drawing is an overall structure schematic diagram of the present utility model.

Among the figure: 1, main cutting tooth, 2, secondary cutting teeth, 3, drill bit spiral wing, 4, bit port.

The specific embodiment:

The utility model is provided by following examples, is illustrated below in conjunction with accompanying drawing.

As shown in the figure, horizontal well diamond compact deflecting bit is made up of main cutting tooth 1, secondary cutting teeth 2, drill bit spiral wing 3, bit port 4: deflecting bit adopts five wing bit bodys, in bit body, be provided with five drill bit spiral wings 3, be welded with 4-7 the main cutting tooth 1 that diamond compact makes and the secondary cutting teeth 2 of 2 high strength cemented carbides in each drill bit spiral wing, at the interplane bit port 4 that is provided with of each drill bit circular knife.

Claims

1. a horizontal well diamond compact deflecting bit is made up of main cutting tooth (1), secondary cutting teeth (2), drill bit spiral wing (3), bit port (4), it is characterized in that: deflecting bit adopts five wing bit bodys, in bit body, be provided with 5 drill bit spiral wings (3), be welded with the secondary cutting teeth (2) of 4-7 diamond compact main cutting tooth (1) and 2 high strength cemented carbides in each drill bit spiral wing, at the interplane bit port (4) that is provided with of each drill bit circular knife.