steam injection wells the well completion process can be used to complete the construction of a vertical steam injection or oil production well as part of a thermal enhanced oil recover u201c teor u201d project typically steam that is mechanically generated in the filed is used in teor projects to recover heavy grade highly viscous crude oil this process described below could be applied in wells for non teor service including water flood producing wells or for any type of well requiring sand control such as production wells or injection wells that handle water crude oil natural gas or other liquids or gases associated with mineral or fluid extraction of injection or other wells utilized in the petroleum geothermal and agricultural industries the well schematically shown in fig1 is a preferred drilled horizontal well 10 intended for steam injection operation the well has a surface casing 12 containing a projecting buttress casing 14 perforated with eleven individually selected perforations 16 from 3972 u2032 to 4302 u2032 from the surface within this interval the perforations are located in sand formation or formations of interest each perforation is 0 25 inches in diameter and is formed downhole by methods well known in the oil drilling industry as described below perforation sizes can vary according to a specific application the buttress casing 14 contains insulated tubing 18 connected to an expansion joint 20 and a thermal packer 22 a tubing tail 24 extends beyond the packer and.