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A combined pdc drill bit

A combined, drill bit technology, applied in drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of low drilling speed and inability to adjust the PDC bit, and achieve the effect of improving the drilling speed

Active Publication Date: 2018-08-31
CANGZHOU GREAT DRILL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem that the existing PDC bit can not be adjusted according to the degree of softness and hardness of the geological environment, resulting in low drilling speed, the present invention provides a combined PDC bit, which can adjust the PDC cutting teeth according to the degree of softness and hardness of the formation, thereby improving the drilling speed. speed

Method used

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  • A combined pdc drill bit
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The combined PDC drill bit of this embodiment includes a drill base body, on which a gauge tooth, a long blade and a short blade are arranged, and the long blade and the short blade are arranged at intervals, and the long blade is distributed There are large-diameter PDC cutting teeth, and small-diameter PDC cutting teeth are distributed on the short blades. The long blades can reciprocate along the axis direction of the drill bit base; The hydraulic chamber of the long blade is connected with a piston rod that can slide in the hydraulic chamber, and the periphery of the hydraulic chamber is provided with a plurality of evenly arranged limit grooves, and the long blade is connected with a telescopic and The limit slots are matched with movable pins, and the axial directions of the movable pins and the drill base body are perpendicular to each other.

Embodiment 2

[0037] The combined PDC drill bit of this embodiment includes a drill base body, on which a gauge tooth, a long blade and a short blade are arranged, and the long blade and the short blade are arranged at intervals, and the long blade is distributed There are large-diameter PDC cutting teeth, and small-diameter PDC cutting teeth are distributed on the short blades. The long blades can reciprocate along the axis direction of the drill bit base; The hydraulic chamber of the long blade is connected with a piston rod that can slide in the hydraulic chamber, and the periphery of the hydraulic chamber is provided with a plurality of evenly arranged limit grooves, and the long blade is connected with a telescopic and The movable pins are matched with each other in the limit grooves, and the axial direction of the movable pins and the drill base body are perpendicular to each other; the long blade is provided with a sealing cavity with movable pins, and one end of the movable pins exte...

Embodiment 3

[0039] The combined PDC drill bit of this embodiment includes a drill base body, on which a gauge tooth, a long blade and a short blade are arranged, and the long blade and the short blade are arranged at intervals, and the long blade is distributed There are large-diameter PDC cutting teeth, and small-diameter PDC cutting teeth are distributed on the short blades. The long blades can reciprocate along the axis direction of the drill bit base; The hydraulic chamber of the long blade is connected with a piston rod that can slide in the hydraulic chamber, and the periphery of the hydraulic chamber is provided with a plurality of evenly arranged limit grooves, and the long blade is connected with a telescopic and The movable pins are matched with each other in the limit grooves, and the axial direction of the movable pins and the drill base body are perpendicular to each other; the long blade is provided with a sealing cavity with movable pins, and one end of the movable pins exte...

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Abstract

The invention belongs to the technical field of PDC (Polycrystalline Diamond Compact) bits, discloses a combined PDC bit, and aims to solve the problems that conventional PDC bits cannot be adjusted according to the soft and hard degrees of geologies and the drilling rate is low. The bit disclosed by the invention comprises a bit matrix, wherein gauge teeth and mutually-spaced long knife wings and short knife wings are arranged on the bit matrix; large-diameter PDC cutting teeth are distributed on the long knife wings; small-diameter PDC cutting teeth are distributed on the short knife wings; the long knife wings can do reciprocating motion along the axis direction of the bit matrix; a hydraulic cavity parallel to the axis direction of the bit matrix is formed in the bit matrix; the long knife wings are connected with a piston rod capable of sliding in the hydraulic cavity; a plurality of limit grooves are uniformly formed in the periphery of the hydraulic cavity; a retractable movable pin matched with the limit grooves is connected onto the long knife wings; the movable pin is perpendicular to the axis direction of the bit matrix.

Description

technical field [0001] The invention belongs to the technical field of PDC drill bits, and in particular relates to a combined PDC drill bit. Background technique [0002] PDC (Poly Diamond Composite) drill bits are widely used in petroleum and geological fields as a drill bit with high hardness, wear resistance and service life. The main way for the PDC bit to break the rock is to cut the rock. Because it generally has 3-7 blades, more than a dozen composite sheets, and the rock is heterogeneous, there is a severe lateral vibration when the PDC bit is working, which weakens the Efficiency in breaking rock. In order to suppress the lateral vibration of the drill bit, some drill bits have strengthened the gage structure, so that the diameter of the gage structure is slightly larger than the diameter of the drill bit, and the gage structure domain is in close contact with the well wall in a large area, thereby effectively suppressing the lateral vibration. [0003] In the ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/43E21B10/62
CPCE21B10/43E21B10/62
Inventor 张占奎
Owner CANGZHOU GREAT DRILL