1

API Spec 5CT, API Spec 5B, SY/T6194

SN/T 0820-2011, API Spec 5CT (International Version), GB/T 2102-2022, Complies with API Q1 Quality System Requirements, Supports Customs Commodity Inspection and Third-Party Testing

H40

114.3~610.0

4.0~19.1

14.14~35.86

STC (Short Thread Connection), LC (Long Thread Connection), BC (Buttress Thread Connection)

R-1 (4.88~7.62), R-2 (7.62~10.36), R-3 (10.36 and above), Customizable

Shallow well casing, suitable for low pressure and low corrosion environment

2

J55

114.3~610.0

4.0~19.1

14.14~35.86

General-purpose shallow and medium-shallow well casing with high cost performance

3

K55

114.3~610.0

4.0~19.1

14.14~35.86

Medium-shallow well casing, slightly higher strength than J55, suitable for medium pressure environment

4

M65

114.3~610.0

4.0~19.1

15.63~35.86

Medium-deep well casing with good collapse resistance

5

L80-1

114.3~610.0

4.0~19.1

17.26~35.86

Medium-deep and deep well casing with excellent corrosion resistance and collapse resistance

6

N80-Q

114.3~610.0

4.0~19.1

17.26~35.86

Deep and high-pressure oil and gas well casing, sulfur corrosion resistant with good sealing performance

7

P110

114.3~610.0

4.0~19.1

17.26~35.86

Deep and ultra-deep well casing with high strength and high collapse resistance, suitable for complex geology

8

Non-API Series (e.g., BG80ET)

114.3~610.0

4.0~19.1

15.63~35.86

Customized scenarios, suitable for special geology, high pressure and high corrosion environment