Failure Analysis of Tubing Collapse in a Gas Well

Table 2

Chemical composition of failed tubing and the same batch of tubing without failure (wt.%).

Element Sample	C	Si	Mn	P	S	Cr	Mo
Failed pipe body	0.19	0.19	0.48	0.0063	0.0011	0.49	0.72
The tubing body in the same batch	0.19	0.19	0.48	0.0057	0.001	0.50	0.73
Requirements of ordering technical agreement requirement	≤0.35	≤0.50	≤1.20	≤0.015	≤0.003	0.10–1.60	0.20–1.20