with FIG. I A system 10 comprising a well bore 11 having a wellhead 12, a pump assembly comprising a progressive cavity pump 13, a hollow drive rod 14 connected to the pump, and as can be seen the pump forces liquid from the well hole at 15 as a stream up an annular space 16. Gas produced flows in a stream to the wellhead along a production casing defined annular space 17. The two streams are maintained separate in the wellhead, the stream from 16 carrying sand and solids is output to a desander 18. Solids are separated and relatively clean liquid is output from the desander at 19. Part of this is recycled along line 20 back to the hollow drive rod 14 where that liquid is delivered through the hollow rotor 21 of the pump 13 to the inlet side 22 of the pump to agitate the bottom of the well. -18- -2
