Changsha Drilling Machinery CO., LTD

Contact Us

Name: Perry Tan
Tel: 0086-731-84077805
Fax: 0086-731-84072772
E-mail: csdrillingtools@vip.126.com
E-mail: info@csdrillingtools.com
Add: 5# Panpan road, economic development zone, Changsha, Hunan, China. Zip 410100
Skype: csdrillingtools
QQ: 2522716948
Skype: csdrillingtools QQ: 2522716948 csdrillingtools@vip.126.com info@csdrillingtools.com

Link
Rotary speed selection chart
 


Bit type

Impregnated core bits

Increase the speed

Surface set core bits

Decrease the speed

Bit diameter

Small bit diameter

Increase the speed

Large bit diameter

Decrease the speed

Peripheral velocity

High velocity

Decrease the speed

Low velocity

Decrease the speed

Rock properties

Hard and complete

Increase the speed

Soft and broken

Decrease the speed

Diamond
Large size

Increase the speed

Small size

Decrease the speed

Drilling equipment and core barrel

Good stability

Increase the speed

Poor stability

Decrease the speed

Drilling depth
Shallow hole

Increase the speed

Deep hole

Decrease the speed

Structure of boreholes

Simple structure

Increase the speed

Complicated structure

Decrease the speed