Casing Make-Up Torque

Print

Due to potential frequent changes to casing specification, casing make-up torque and drift dimensions shall be as per the manufacturer's recommendations.          

                                                       
Buttress Thread Casing Connections

9.5/8 - 13.3/8 OD Casing (BTC)

Make-up torque valves of buttress thread casing connections sizes 9.5/8in to 13.3/8in OD shall be determined by carefully noting the torque required to make up each of several connections to the base of the triangle. Provided the position falls within
- 0.2in and + 0.375in of the base, the power tight make-up is acceptable. The average torque value established shall be used to make up the balance of the pipe of that particular weight and grade in the string.

 

16in, 18.5/8in and 20 in BTC Round Thread

Make-up of 16in, 18.5/8in and 20in OD shall be to a position on each connection represented by the thread vanish point on 8-round thread and the base of the triangle on buttress thread using the minimum torque shown in the following table as a guide. Provided the position falls within - 0.2in and + 0.375in of the base, the power tight make-up is acceptable. Care must be taken to avoid cross threading in starting these larger connections. The tongs selected shall be capable of attaining high torque for the entire run. It can be anticipated that maximum make-up and break out torque values may be 50-80 % higher than the minimum experienced in make-up to the recommended position.

Make-up torque values are based on API modified thread lubricant with friction correction factor = 1.

All connections are of regular coupling/upset type unless otherwise specified

Size (OD)

Weight (ppf)

Grade

Make-Up torque (ft. lbs)

 

 

 

Minimum

Optimum

Maximum

7in

26

N-80 BTC

3 890

5 190

6 490

 

29

N-80 BTC

4 480

5 970

7 460

9.5/8in

43.5

N-80 BTC

6 190

8 250

10 310

 

47

N-80 BTC

6 790

9 050

11 310

13.3/8in

61

K-55 BTC

4 750

6 330

7 910

 

68

K-55 BTC

5 390

7 180

8 980

 

72

N-80 BTC

7 800

10 400

13 000

20in

94

K-55 BTC

9 550

 

 

Note:   The torque values shown above are values experienced in practice. However, the actual torque value to be used for Buttress Thread shall be determined as previously described.

 

 

You have no rights to post comments

Additional information