surface to the beginning of the horizontal interval the horizontal interval is cased with pre perforated 7 inch outer diameter liner 116 6 366 inch inner diameter the 3 u00bd inch outer diameter 2 992 inch inner diameter production tubing string 124 extends from the earth 39 s surface to and just through the dual packer 126 terminating at production inlet 127 four inch outer diameter 3 548 inch inner diameter steam injection tubing 120 extends essentially to the bottom of the well bore i e far end of the horizontal section of the well bore and its casing fig1 thirteen horizontally oriented with respect to the long axes of both the casing and injection tubing steam injection nozzles 205 405 etc are placed at about 100 foot intervals along and around fig3 the length of the injection tubing with their outlets facing toward inlet 127 the horizontal section of the well bore and the steam cavity in formation 114 are kept at an essentially constant temperature and pressure of about 350 u00b0 f and about 135 psia the 13 nozzles use an initial steam injection rate of about 945 pounds per hour per nozzle using nozzle chokes from about 0 302 to about 0 308 inches individual nozzle steam emission velocities are about 1 339 feet per second the horizontal interval varies in a sinusoidal manner up and down from the intended well bore path about 1 foot after 3 5 years of production the maximum steam injection rate is about 20 6 million btu 39 s per hour thereby producing about 200 barrels of hydrocarbon per day and about 1 520 barrels of water per day at this time each nozzle is emitting about 1 620 pounds of steam per hour.