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Special-shaped balling resistant PDC drill bit

A technology of mud balls and drill bits, which is applied in the direction of drill bits, drilling equipment, earthwork drilling and production, etc., to achieve good effects of preventing mud balls of drill bits, improving ROP, and ensuring underground safety.

Pending Publication Date: 2018-01-09
CANGZHOU GREAT DRILL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is: in order to solve the existing steel body PDC drill bit, matrix PDC drill bit in each well section drilling, the soft mudstone stratum that drills encounters viscosity is bigger, easily absorbs water to expand stratum, clay layer or colloidal mudstone occurrence The technical problem of the mud bag phenomenon, the invention provides a special type of mud bag PDC drill bit

Method used

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  • Special-shaped balling resistant PDC drill bit
  • Special-shaped balling resistant PDC drill bit
  • Special-shaped balling resistant PDC drill bit

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Such as Figures 1 to 3 As shown, the present embodiment provides a special type of mud-rejecting bag PDC drill bit, which includes a drill bit body 3, a threaded joint 1 located at the lower part of the drill bit body 3 and connected to a drill pipe, and several blades 5 located at the upper part of the drill bit body 3. The groove between the adjacent blades 5 forms a chip removal groove 7, and a composite sheet 4 is installed on each blade 5, and it is characterized in that: one side of each blade 5 is provided with a mud-rejecting groove 2, so The outer edge of the mud-repelling trapping groove 2 starts from the bottom of the composite sheet 4, and the inner edge of the mud-repelling trapping groove 2 ends at the chip removal groove 7.

Embodiment 2

[0029] This embodiment is further optimized on the basis of embodiment 1, specifically:

[0030] The blade 5 is composed of an inner cone 5-3, a nose 5-2 and an outer cone 5-1 connected in sequence, and the outer edge of the mud-repelling trap groove 2 is the inner cone 5-3, the nose 5-2 The outline track formed by the outer cone 5-1 is shifted to the lower part of the composite sheet 4 to form the second characteristic surface of the blade from the outer edge of the mud-rejecting trapping groove 2 to the chip removal groove, and the second characteristic faces the working side of the drill bit. Material is removed in the opposite direction to form the mud-repelling trapping groove 2 .

Embodiment 3

[0032] This embodiment has been further optimized on the basis of embodiment 1 or 2, specifically:

[0033] The outer edge of the mud-repelling entrapment groove 2 is formed by offsetting the outline track line formed by the inner cone 5-3, the nose 5-2 and the outer cone 5-1 to the lower part of the composite sheet 4 by 10-20 mm, and the second feature Facing the opposite direction of the drill bit, remove 5-8 mm of material to form the mud-repelling trap groove 2 .

[0034] The drill body 3 is provided with a plurality of nozzles 6 .

[0035] The PDC drill bit with mud-repelling groove can pass the extruded colloidal mudstone through the first surface of the blade at the lower end of the composite sheet at a distance of 10-20mm, then break the contact with the surface of the blade, and form a structure with the second surface of the blade. A certain space forms a suspended state. The mud pump of the main equipment on the ground passes the drilling fluid through the high-pr...

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Abstract

The invention discloses a special-shaped balling resistant PDC drill bit and relates to the technical field of drill bits. The special-shaped balling resistant PDC drill bit comprises a drill bit mainbody, a thread connector and a plurality of blades, wherein the thread connector is located on the lower portion of the drill bit main body and connected with a drill rod, and the multiple blades arelocated on the upper portion of the drill bit main body. A groove between every two adjacent blades forms a chip discharging groove. A composite piece is mounted on each blade. A balling resistant sunken groove is formed in one side face of each blade. The outer edges of the balling resistant sunken grooves start in the positions below the composite pieces, and the inner edges of the balling resistant sunken grooves end at the chip discharging groove. The structure is simple, and the low mechanical drilling speed, jamming of a drilling tool, well leakage, well blowout and other serious accidents caused by the balling phenomenon of the drill bit are effectively prevented.

Description

technical field [0001] The invention relates to the technical field of petroleum weather drilling and exploration engineering, and more specifically relates to a special type of mud-repelling bag PDC drill bit. Background technique [0002] In the drilling process, the drill bit is the main tool for breaking rock, and the wellbore is formed by breaking the rock with the drill bit. Whether a wellbore is formed well or not, the length of time it takes is not only related to the characteristics of the drilled formation rock and the performance of the drill bit itself, but also to the degree of matching between the drill bit and the formation. The reasonable selection of the drill bit plays an important role in increasing the drilling speed and reducing the overall cost of drilling. [0003] The drill bit is one of the important tools for oil drilling. Whether the drill bit adapts to the rock properties and its quality plays a very important role in the selection of drilling te...

Claims

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Application Information

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IPC IPC(8): E21B10/00E21B10/43E21B10/60
Inventor 张占奎于振忠褚方磊刘超
Owner CANGZHOU GREAT DRILL
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