Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 13, 2018
Entity Registrant Name	Sentinel Energy Services Inc.
Entity Central Index Key	0001709768
Trading Symbol	STNL
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2018
Entity Filer Category	Non-accelerated Filer
Class A ordinary shares
Entity Common Stock, Shares Outstanding		34,500,000
Class B ordinary shares
Entity Common Stock, Shares Outstanding		8,625,000