Patent ID: 9617830
Date: 2017-04-11
CPC Classifications: E21B

Claim:
1. A downhole chemical injection system for positioning in a well, the system comprising: a generally tubular mandrel having an axially extending internal passageway and an exterior, the mandrel including an injection port in fluid communication with at least one of the internal passageway and the exterior of the mandrel; a chemical injection line coupled to the mandrel and operable to transport a treatment fluid from a surface installation to the mandrel; a check valve supported by the mandrel and in downstream fluid communication with the chemical injection line; and a density barrier fluidically positioned between the check valve and the injection port, the density barrier having an axial loop and a circumferential loop relative to the mandrel, thereby preventing migration of production fluid from the injection port to the check valve regardless of the directional orientation of the well.