Specifications

exploration for petroleum geothermal coalfield;
active drill pipe;standard of SY/T6509-2000 or API SPEC.7-1.

Weight: 1 (T)

Model: 3-1/2 4-1/4 5-1/4

Bore diameter: 50.857 71.4 (mm)

Alias: active drill pipe

Drilling depth: 12.2 (m)

Drilling angle: 90 (degrees)

Application: oil geothermal ,coal exploration

Dimensions: 89 108 133 (mm)

Square Kelly and Hexagonal Kelly

1. Specification

2. Description

AISI4145H alloysteel is used in producing the Kellies. Kelly’s’end, drive cross-section and joint are all processed and

tested in terms of API.

3. Main Function

 Kellies are the drive section of the whole drill stem.

 The manufacturing of the products refers to the standard of SY/T6509-2000 or API SPEC.7-1.