D. K. Sethi, W. C. Vercellino and W. H. Fertl
Dresser Atlas, Dresser Industries, Inc.
Houston, Texas
ABSTRACT
The Formation Multi-Tester (FMT), run on wireline in open hole, provides information on several reservoir characteristics, including identification of fluid types, pressures, permeability, and formation producibility.
Based on a multi-set capability an unlimited number of formation pressure tests can be made to assist in determination of reservoir pressure (including mud weight requirements and casing seat selection in overpressure environments), monitoring of pressure depletion in stratified reservoirs, reservoir isolation or intercommunication, and the analytical determination of the deepest possible gas/fluid or oil/water contact to be expected in the penetrated subject formation.
Furthermore, estimates of reservoir permeability can be obtained based on pressure buildup or drawdown concepts and collected fluid samples provide information as to type of fluid, fluid density, gravity of oil, volume of gas, gas/oil ratio, filtrate contamination, formation water salinity (resistivity), and production type prediction.
The paper describes the basic operating principles and specifications of the FMT tool and presents the problem-solving application of analytical concepts in drilling operations, exploration, and reservoir engineering.