Composite drill bit

A compound drill bit and drill bit technology, which is applied in the direction of drill bit, drilling equipment, earthwork drilling, etc., can solve the problems of large torque fluctuation, slow mechanical drilling speed, and damage to the drill bit, and achieve reduced torque fluctuation, high cutting efficiency, and attack strong effect

Inactive Publication Date: 2016-11-16
TIANJIN LILIN BIT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional drill bits mainly have the following disadvantages: ①Roller cone bits are traditionally used but the ROP is very slow; ②When large-diameter PDC bits and roller cone bits are used, the torque or WOB is limited; ③The formation is highly interactive, and the torque Large fluctuations may cause early damage to the drill bit; ④ Motor drilling or directional drilling requires fast ROP, high slope gain and easy control of the tool face

Method used

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Embodiment Construction

[0015] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments. Such as figure 1 As shown, a composite drill bit includes a PDC drill bit 1 and a roller cone 2, and the roller cone is installed on the PDC drill bit.

[0016] There are many types of hybrid bit designs: such as figure 2 As shown, 1. the design of the smaller diameter drill bit with two cones and two blades, if there are two cones, there are two blades 3 on the PDC drill bit, and the cones and the blades are intersected.

[0017] Such as image 3 As shown, ②Drill bits with two cones and four blades are designed with two cones, and the PDC bit has four blades. The four blades are divided into two groups, two in each group, and the two cones correspond to Set between two sets of blades.

[0018] Such as Figure 4 As shown in Fig. 3, the design of the larger diameter bit with three cones and three blad...

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Abstract

The invention relates to the technical field of petroleum drilling and well cementation, in particular to a composite drill bit which comprises a PDC drill bit body and roller cones. The roller cones are installed on the PDC drill bit body. The roller cone and PDC composite drill bit is composed of the roller cones and PDC, the advantages of roller cone drill bits and PDC drill bits are combined, the aggressivity is high, the cutting efficiency is high, the mechanical drilling speed of the composite drill bit is 2-4 times higher than the roller cone drill bits when the composite drill bit operates on poor-drillability stratums (such as igneous rock and mud and sand interbeddings containing gravels), and the mechanical drilling speed and the rotation speed are in direct proportion. When a motor is adopted by the roller cone and PDC composite drill bit for drilling, the mechanical drilling speed is increased remarkably. Another advantage is reflected in the influences of the roller cones on drill bit dynamics, compared with the conventional PDC drill bits, the torque fluctuation degree can be reduced by as much as 50%, the torsional vibration degree is lowered under the low rotation speed condition, and the whirling vibration degree is lowered under the high rotation speed condition.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling and well cementing, in particular to a composite drill bit. Background technique [0002] A roller cone bit is a tool for breaking rock in the earth's crust. The roller cone bits used in oil drilling and other mining drilling can be divided into single cone bits, two cone bits, three cone bits, etc., all of which are composed of cones and cones with cutting teeth. Traditional drill bits mainly have the following disadvantages: ①Roller cone bits are traditionally used but the ROP is very slow; ②When large-diameter PDC bits and roller cone bits are used, the torque or WOB is limited; ③The formation is highly interactive, and the torque Large fluctuations may cause early damage to the drill bit; ④ Motor drilling or directional drilling requires fast ROP, high slope gain and easy control of the tool face. Contents of the invention [0003] The object of the present invention is to overc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/00E21B10/43E21B10/46E21B10/16
CPCE21B10/00E21B10/16E21B10/43E21B10/46
Inventor 高磊罗绪良胡友生
Owner TIANJIN LILIN BIT
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