Enhanced Formation Evaluation Tool (EFET)
EFET is a third-generation product of the formation tester family, characterized by the function of pump through. It is compact, convenient, safe and efficient tool. It can replace partially Drill Stem Testing (DST) operations in order to save rig time. EFET provides economical and reliable solution to formation evaluation for oil field exploration and engineering. EFET is a good way to reduce cost and to solve some difficult technical problems.
The Pump-Thru section contains a reciprocating pump, a Conductivity Sensor and a Salinity Sensor. It attaches to the ordinary Formation Pressure Tester tool in place of the lower tank. When power is switched to the Pump-Thru, invaded well bore fluid is pumped through the Pump-Thru and expelled to well bore. Once real formation fluid reaches the sensors and is verified, a sample may be taken in the upper tank. The purpose of the Formation Pressure Tester and Pump-Thru is to flush mud filtrate from the formation to the well bore, thus increasing the probability of retrieving a true formation sample. It can recover four fluid samples, each at different depths, and take pressure readings of any permeable formation desired.
