Casing failure identification of long-abandoned geothermal wells in Field Dieng, Indonesia

Geothermal Energy

Science – Society – Technology

Table 4 Summary analysis of production casing and tieback casing load calculation for wells HCE9B and HCE28B

Well	Production casing data			Burst (MPa)			Collapse (MPa)			Tension (kN)
Well	Casing grade/pounder	Casing depth (m TVD/MD)		Resultant (design factor)	Burst rating^a	Evaluation	Resultant (design factor)	Collapse rating^a	Evaluation	Resultant (design factor)	Tension rating^a	Evaluation
HCE9B	339.7 mm K-55 101.2 kg/m	Top	0	38.7	23.8	Failed	0	13.4	Accepted	3073	4755	Accepted
HCE9B	339.7 mm K-55 101.2 kg/m	Bottom	1519/1613	23.8	18.1	Failed	45	10.2	Failed	0	3614	Accepted
HCE28B	339.7 mm K-55 101.2 kg/m	Top	0	40	23.8	Failed	0	13.4	Accepted	2930	4755	Accepted
	339.7 mm K-55 101.2 kg/m	Bottom	1504/1538	25.7	16.7	Failed	40	9.4	Failed	0	3337	Accepted
	Tieback 273.1 mm L-80 82.3 kg/m	Top	0	40	44.5	Accepted	0	27.7	Accepted	2391	5676	Accepted
	Tieback 273.1 mm L-80 82.3 kg/m	Bottom	1504/1538	25.7	31.2	Accepted	40	19.5	Failed	0	3983	Accepted