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 visco

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
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] Such as Figure 1 to 3 As shown, this embodiment provides a special mud-repellent package PDC drill bit, which includes a drill bit body 3, a threaded joint located at the lower part of the drill bit body 3 and connected to a drill rod 1, a plurality of blades 5 located on the upper part of the drill bit body 3, two phases The grooves between the adjacent blades 5 form chip flutes 7, and each blade 5 is equipped with a composite sheet 4, which is characterized in that: a mud-repellent pocket 2 is provided on one side of each blade 5, so The outer edge of the mud-repellent sink 2 starts below the composite sheet 4, and the inner edge of the mud-repellent sink 2 ends at the chip flute 7.

Example Embodiment

[0028] Example 2

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

[0030] The blade wing 5 is composed of an inner cone 5-3, a nose 5-2 and an outer cone 5-1 which are connected in sequence. The outer edges of the mud-repellent sink 2 are the inner cone 5-3 and the nose 5-2. The contour trajectory formed by the outer cone portion 5-1 is offset to the lower part of the composite sheet 4, and the second characteristic surface of the blade is formed from the outer edge of the mud-repellent pocket 2 to the chip groove, and the second characteristic faces the drill bit. The material is removed in the opposite direction to form a mud-repellent pocket 2.

Example Embodiment

[0031] Example 3

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

[0033] The outer edge of the mud-repellent pocket 2 is formed by the contour trajectory formed by the inner cone 5-3, the nose 5-2, and the outer cone 5-1 offset to the lower part of the composite sheet 4 by 10-20mm, which is the second feature Facing the opposite direction of the drill bit, remove 5-8mm material to form mud-repellent pocket 2.

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

[0035] The PDC drill bit with mud-repellent pocket 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, and then break the contact with the surface of the blade to form 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-pressure manifold→drill pipe→drill col...

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PUM

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Abstract

The invention discloses a special-type mud-rejecting bag PDC drill bit, which relates to the technical field of drill bits. The invention includes a drill bit body, a threaded joint located at the lower part of the drill bit body and connected to a drill pipe, and several blades located at the upper part of the drill bit body. Two adjacent The groove between the blades forms a chip removal groove, each blade is equipped with a composite sheet, and one side of each blade is provided with a mud-repelling bag groove, and the outer edge of the mud-resistant bag groove starts Below the composite sheet, the inner edge of the mud-repelling bagging groove terminates at the chip removal groove; the invention has a simple structure and can effectively prevent low ROP and serious accidents such as drill sticking, lost circulation and blowout caused by mud bagging of the drill bit.

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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