The selection of a good candidate well is critical to the success of any SWCT field study. The test well should be completed to a single homogeneous zone to achieve ideal test conditions. The candidate well should penetrate the test zone at a point above the original oil water contact, have a means of producing fluids (rod pump, sub. pump, gas-lift equipment, etc.) and the test zone not artificially fractured and propped. The SWCT technique should be carried out from a producer to best represent reservoir conditions. Generally, newer producing wells give better test results than older wells. This trend is primarily due to the newer wells having better quality cement and having fewer conduit problems such as holes in the casing, leaking squeeze cement repairs, channels behind casing, etc. Normally, wells that have adequate equipment to serve as producers (flow line in place, electrical power, artificial lift equipment, etc) and are producing from the test zone without serious mechanical problems are suitable candidates.