91 coaxial with motor housing 77 and the motor bearings and with armature 87 above the field windings and below support 79 is power supply 93 contained within housing 77 whereby the motor has a self contained power supply for further details of a suitable motor see the aforementioned application of t a rabson ser no 542 634 entitled 34 periodic reciprocating motor 34 other known forms of motor could be employed motor housing 77 is of smaller outer diameter than the inner diameter of well casing 33 leaving an annular passage 95 therebetween being a continuation of and connecting the upper and lower portions of casing annulus 61 a screw connector 97 may connect upper out board motor support 79 with the lower end of a string of tubing 99 the tubing string is sealed to the casing by hookwall packer 101 which may be similar to packer 37 within connector 97 is a check valve 103 for admitting fluid to the tubing from the casing annulus via lateral port 105 and preventing back flow from the tubing to the annulus valve 103 may be called an upper standing valve tubing string 99 extends to the earth 39 s surface inside surface casing 105 casing 33 may also extend to the surface between the tubing and outer casing or may be supported within and sealed to the latter by a conventional liner hanger packer not shown connector 97 tubing 99 packer 101 and.