Schlumberger has developed an improved downhole fluid analyzer (DFA) module to work in conjunction with the focused extraction of pure reservoir fluids. In addition to comprehensive

The InSitu Density sensor (dark blue) begins its station measurement as soon as clean fluid is acquired, indicated when the data quality flag goes green. (Graphic courtesy of Schlumberger)
real-time characterization of reservoir fluid properties and quantification of their variation, the new module also provides a family of new measurements. Known as InSitu Density, these measurements provide previously unobtainable reservoir insight by providing quantitative fluid properties measurements at reservoir conditions.

The module’s sensor uses a geometrical arrangement to minimize temperature and pressure effects and, with its dual resonance modes, directly computes density from the resonator-fluid interaction at a one-second frequency. The sensor also features zero dead volume with a repeatable accuracy within ±0.012 g/cu cm over a range of densities from 0.05 g/cu cm to 1.20 g/cu cm, with resolution of 0.001 g/cu cm.

The InSitu Density measurement complements other DFA sensors by providing more precise downhole fluid identification in real-time helping operators identify reservoir compartmentalization. In addition to important advantages over surface measurements the company’s new module also provides accurate fluid gradients, thin-bed analysis, as well as accurate definition of transition zones, improved fluid modeling and compositional grading with the reservoir column. The measurement also enhances estimation of liquid production in gas reservoirs.

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