rock failure mechanisms and pdc bit
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TP ON DU KH VIT NAMTRNG I HC DU KH VIT NAM
Group 10
ROCK FAILURE MECHANISMS & PDC
Dr. Nguyen Van Hung
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Rock Failure MechanismsDrilling Engineering
M
1. Nguyen Quang Khai
2. Doan Nguyen Minh Son
3. Vu Xuan Van
4. Nguyen Xuan Tan Binh
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Rock Failure MechanismsDrilling Engineering
1. Oil & gas drill bits overview
2.The Mohr criterion
3. Rock failure mechanisms
4. PDC bit
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Rock Failure MechanismsDrilling Engineering
Oil & gas drill bits o
Video
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The Mohr
=1
1+ 3
1
1 3 cos 2 (1)
=1
1 3 sin 2 (2)
+ 2 = 90 (3)
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The Mohr criterion-
Problem:
A rock sample under a 2,000-psi confining pressure fails w
subjected to a compressional loading of 10,000 psi along a
makes an angle of 27with the direction of the compressio
Using the Mohr failure criterion, determine the angle of inte
the shear strength, and the cohesive resistance of the mate
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The Mohr criterion-
Solution:
The angles and 2must sum to 90. Thus, the angle of i
friction is given by
= 90-2(27)=36.
The shear strength is computed using Eq (2) as follow= 1/2(10,000-2,000) sin(54)=3,236.
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The Mohr criterion-
Solution:
The stress normal to the fracture plane is computed usi
Eq (1) as follows.
=1/2(10,000+2,000)- 1/2(10,000-2,000)cos(54)=3,6
The cohesive resistance can be computed by rearrangin
tangential line Eq as follows.c= tan
=3,236-3,649tan(36)
= 585 psi.
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Rock failure mec
Basic mechanisms of rock removal:
1 Wedging
2 Scraping and grinding
3 Erosion
4 Percussion or crushing
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Rock failure mec
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Cutters are expected to endure throughout the life of a b
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Rock Failure MechanismsDrilling Engineering
PDC bits drill primarily by shearing
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Rock Failure MechanismsDrilling Engineering
PDC cutters are set into bits to achieve specific rake (atta
relative to the formation.
This angle contributes to bit performance by:
Influencing cleaning efficiency.
Increasing bit aggressiveness.
Prolonging cutter life.
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Rock Failure MechanismsDrilling Engineering
-The tendency for cuttings tostick to the bit face is reduced
-Reduce depth of cut and,thus, ROP and bit vibration
-Increases cutter life
-Aggressiveness, depth of cutand ROP are increased
-To maximize ROP when softerformations are drilled
Increase
rake angle
Decrease
rake angle
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Factors affecting bit design and performanc
Mechanical design parameters
Materials
Hydraulic conditions
Properties of the rock being drilled
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Rock Failure MechanismsDrilling Engineering
Hybrid drill bit
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Rock Failure MechanismsDrilling Engineering
S
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Rock Failure MechanismsDrilling Engineering
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1. Oil & gas drill bits overview: Roller-cone bit and Fixed-c
2. The Mohr criterion: The Mohr criterion, Problem and so
3. Rock failure mechanisms:
4. PDC bit: Properties and Hybrid drill bit
Re
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Rock Failure MechanismsDrilling Engineering
Re
http://petrowiki.org
http://youtube.com
Baker Hughes
Adam T.Bourgoyne Jr, Keith K.Millheim, Martin E.Chenev
Young Jr, Applied Drilling Engineering
PGS.TS L
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khoan khai thcdu
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Future st
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Rock Failure MechanismsDrilling Engineering
Future st
Study the Mohr criterion deeply
Study Rock failure mechanisms
Giving a subtitle to the recommended videos
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