Fine Depicting of Seepage Barrier for Gas Flooding in the Lower Wuerhe Formation Reservoir of the 8^th District in China

Table 8

Relationship between different combinations of well types, seepage barriers, and injection well shot hole locations.

Injection and production well type	Number	Interlayer type and extension distance	Location relationship between the interlayer and shot holes of injection and production wells
Vertical injection and vertical production	A	Single interlayer, 1/2 well spacing	Production well shot hole is located below the interlayer
	B	Single interlayer, 3/4 well spacing	Production well shot hole is located below the interlayer
	C	Single interlayer, 3/4 well spacing	Gas injection well shot hole is located above the interlayer
	D	Multiple interlayers, space stacking	Production well shot hole is located below the interlayer
Vertical injection and horizontal production	E	Single interlayer, 3/4 well spacing	Horizontal section is far from the interlayer
	F	Single interlayer, 3/4 well spacing	Horizontal section is close to the interlayer
	G	Multiple interlayers, 3/4 well spacing	Close longitudinal distance between interlayers
	H	Multiple interlayers, 3/4 well spacing	Long longitudinal distance between interlayers