Gas flooding with horizontal and vertical wells

Patent · Tue Nov 19 04:00:00 EST 1991

OSTI ID:5496097

Huang, W S; Hsu, J J

This patent describes a method of producing hydrocarbons from a portion of an underground formation bounded by at least one substantially vertical well and at least one well having both a vertical wellbore and a horizontal wellbore. It comprises injecting a gas into the formation through a first substantially vertical injection well; performing concurrently with the gas injection through the vertical injection well at least one cycle of gas injection, soak, and production through a horizontal wellbore of a combination vertical and horizontal well; the horizontal wellbore extending from the vertical wellbore of the combination well about one-third to about two-thirds of the distance to the first substantially vertical injection well; after the gas injected through the first substantially vertical injection well reaches the portion of the formation affected by the gas injected and produced through the horizontal wellbore, converting the first substantially vertical injection well to a first substantially vertical production well; setting a production pump relatively near the bottom of the first production well; injecting gas continuously through perforations in the vertical wellbore of the combination vertical and horizontal well relatively near the bottom of the vertical wellbore; and producing gas and hydrocarbons from the first substantially vertical production well.

• Assignee: Texaco, Inc., White Plains, NY (United States)
• Patent Number(s): A; US 5065821
• Application Number: PPN: US 7-463704
• OSTI ID: 5496097
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
BOREHOLES
CAVITIES
DIRECTIONAL DRILLING
DRILLING
FLUID INJECTION
GAS INJECTION
HYDROCARBONS
OIL WELLS
ORGANIC COMPOUNDS
STIMULATION
WELL STIMULATION
WELLS