Why S Seal Is A Preferred Design In The Oil And Gas Equipment?

Why S seal is a preferred design in the oil and gas equipment?

December 09. 2021

Recently, JST 13 inch External S seal has successfully passed the PR2 test at P-U (-20 deg F - 250 degrees F), 10000PSI nitrogen high pressure as per API 6A 21st Edition Annex F Section F.2.14: Design Verification for PR2F Group 5 Mandrel-type hangers,

Table F.17 Sections: Pressure from below seals and pressure from above annulus seals. Test as specified in F.1.11

Test Procedure we follow as below:

Wellhead S Seals

13 Inch ESS External S Seal PR2 Test Data as below:

No.	Test Name	Port	Temp(℃)	Pressure(Psi)	Medium	Pressure Holding Time(S)	Pressure drops(Psi)	Allowable Leakage	Results
1	Monitor O-ring sealing performance of Port C	C	Ambient Temp	100	N2	900			pass
2	Monitor O-ring sealing performance of Port D	D	Ambient Temp	100	N2	900			pass
3	Hydrostatic Test at Ambient Temperature (1 time of Port A & Port B)	A	Ambient Temp	15000	N3	900	≤500	11cm³/h	pass
3		B	Ambient Temp	15000	N3	900	≤500	11cm³/h	pass
4	Pressure test at maximum rated temp	B	121	10000	N2	3600	≤500	/	pass
5	Pressure test at minimum rated temp	B	-29	10000	N2	3600	≤500	/	pass
6	Temp and pressure cycle test Port A	A	Ambient Temp	5000-10000	N2	21600	/	/	pass
			121	10000	N2	57600	≤500	/	pass
			-29	10000	N2	3600	≤500	/	pass
			Ambient Temp	5000-10000	N2	14400	/	/	/
7	Pressure test at maximum rated temp	A	121	10000	N2	3600	≤500	/	pass
7	Pressure test at maximum rated temp	B	121	10000	N2	3600	≤500	/	pass
8	Pressure test at minimum rated temp	A	-29	10000	N2	3600	≤500	/	pass
9	Maximum rated pressure test	A	Ambient Temp	10000	N2	3600	≤500	/	pass
10	Minimum rated pressure test	A	Ambient Temp	500-1000	N2	3600	≤50	/	pass

S Seal is used for many oil and gas equipment, including:

Wellhead pack off / Tubing hanger
Downhole tools
Valves and high-pressure pipelines

S seal is a preferred design based on below characteristic:

Easy to installation
Attack by oilfield media where an O ring cannot survive the maintenance-free life cycle of the equipment
Ability to work efficiently with large clearances
Integral anti-extrusion spring in S seal eliminates the risk of displacement or damage of these elements during assembly.
High groove filling enhances RGD/ED resistance
Extreme of pressure/temperature

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