the inner tubing efficiently lifts reservoir fluids by forcing the reservoir gas into a smaller cross sectional area whereby the gas is not allowed to rise faster than the reservoir liquids due to the smaller tubing size a relatively small amount of reservoir gas can lift reservoir liquids the relatively short distance from the end of the tubing to the one way valve referring to fig1 first tubing string 1 begins at surface 12 and contains seating nipple 48 upper perforated sub 23 blank sub 42 lower perforated sub 24 one way valve 39 on off tool 26 packer 14 bushing 25 and terminates in curve 8 or lateral 10 seating nipple 48 blank sub 42 perforated subs 23 24 on off tool 26 packer 14 one way valve 39 and bushing 25 are all available from weatherford international of houston tex among others connected to seating nipple 48 is pump 5 which is connected to sucker rods 11 which continue up to surface 12 connected to bushing 25 is second tubing string 21 which is connected to one way valve 28 and continues down the wellbore and may terminate prior to the end of tubing 1 the process may be as follows reservoir fluids 7 emanate from reservoir 9 and enter lateral 10 and then enter first tubing string 1 and second tubing string 21 gas in reservoir fluids 7 expand inside second tubing string 21 and lift reservoir fluids 7 up and.